ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (264)
  • Chemical Engineering
  • Electronic structure and strongly correlated systems
  • Saccharomyces cerevisiae
  • high pressure
  • Springer  (264)
  • Iranian Fisheries Science Research Institute
  • Physics  (176)
  • Chemistry and Pharmacology  (99)
Collection
  • Articles  (264)
Source
Keywords
Publisher
Years
Topic
  • 1
    Electronic Resource
    Electronic Resource
    A gene of the major facilitator superfamily encodes a transporter for enterobactin (Enb1p) in Saccharomyces cerevisiae (2000)
    Springer
    BioMetals 13 (2000), S. 65-72 
    Details
    ISSN: 1572-8773
    Keywords: major facilitator superfamily ; iron transport ; siderophores ; enterobactin ; Saccharomyces cerevisiae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract While in fungi iron transport via hydroxamate siderophores has been amply proven, iron transport via enterobactin is largely unknown. Enterobactin is a catecholate-type siderophore produced by several enterobacterial genera grown in severe iron deprivation. By using the KanMX disruption module in vector pUG6 in a fet3Δ background of Saccharomyces cerevisiae we were able to disrupt the gene YOL158c Sce of the major facilitator super family (MFS) which has been previously described as a gene encoding a membrane transporter of unknown function. Contrary to the parental strain, the disruptant was unable to utilize ferric enterobactin in growth promotion tests and in transport assays using 55Fe-enterobactin. All other siderophore transport properties remained unaffected. The results are evidence that in S. cerevisiae the YOL158c Sce gene of the major facilitator super family, now designated ENB1, encodes a transporter protein (Enb1p), which specifically recognizes and transports enterobactin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009250017785
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Adsorbate-induced restructuring and pressure-dependent adsorption on metal nanoparticles studied by electron microscopy and sum frequency generation spectroscopy (2000)
    Springer
    Topics in catalysis 14 (2000), S. 3-14 
    Details
    ISSN: 1572-9028
    Keywords: platinum ; palladium ; alumina ; silica ; nanoparticles ; electron microscopy ; sum frequency generation ; carbon monoxide ; adsorption ; vibrational spectroscopy ; high pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Several examples are presented that illustrate how the internal and surface structure of oxide supported Pt nanoparticles can change under reaction conditions. High temperatures and the presence of adsorbates may lead to different effects: (1) changes in the particle size distribution (sintering or redispersion) that may affect the crystallographic and electronic structure of the nanoparticles, (2) restructuring of the particle surface facets, and (3) crystallization of large polycrystalline aggregates. Three different model systems are described that are well-suited for high resolution transmission electron microscopy (HRTEM) and/or surface science techniques. To examine the influence of high gas pressure on the structure of adsorbates, infrared-visible sum frequency generation (SFG) surface vibrational spectroscopy is applied to monitor CO adsorption on supported Pd nanoparticles from 10-7 to 200 mbar. The adsorption site occupancy of CO, in particular the on-top population, strongly depends on pressure and temperature preventing a simple extrapolation of low pressure results to reaction conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009094613850
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Understanding heterogeneous catalysis on an atomic scale: a combined surface science and reactivity investigation for the dehydrogenation of ethylbenzene over iron oxide catalysts (2000)
    Springer
    Topics in catalysis 14 (2000), S. 111-123 
    Details
    ISSN: 1572-9028
    Keywords: metal oxides ; atomic scale surface chemistry ; TDS ; single crystal flow reactor ; high pressure ; pressure gap ; defects ; active carbon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In order to study the dehydrogenation of ethylbenzene to styrene, epitaxial iron oxide model catalyst films with Fe3O4(111), α-Fe2O3(0001) and KFe x O y (111) stoichiometry were prepared in single crystal quality on Pt(111). They were investigated using surface science techniques before and after atmospheric pressure reaction experiments in a newly designed single crystal flow reactor. As expected from low-pressure measurements, Fe3O4(111) is catalytically inactive. The catalytic activity of α-Fe2O3(0001) starts after an activation period of about 45 min. After that, the surface is essentially clean but shows a high concentration of defects. On the potassium-promoted films, however, the activation period is much longer, the activity then is higher and the surface gets covered completely with carbon and oxygen during reaction. This indicates a different reaction pathway on the promoted films with a carbon–oxygen species as catalytically active species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009067302464
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Yeast Intracellular Water Determination by Thermogravimetry (2000)
    Springer
    Journal of thermal analysis and calorimetry 59 (2000), S. 643-648 
    Details
    ISSN: 1572-8943
    Keywords: drying ; intracellular water ; Saccharomyces cerevisiae ; TG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The intracellular water content of a microorganism is an important parameter which is a determinant factor of its physiological properties. It is usually measured by complex and time consuming procedures. Thermogravimetry using infrared balance has been used for this purpose, through the identification of different drying steps occurring during the analysis. This work employs the same method with much smaller samples, using conventional thermogravimetric equipment in a simpler and faster way than other conventional procedures. Commercial yeast (Saccharomyces cerevisiae ) washed samples are analyzed in isothermal procedures which are run in about 30 min. The drying rate curve, when plotted as a function of the residual mass of the cells, allows the identification of the step where the intracellular water is lost and the determination of its content. The obtained values, on extracellular water free basis, are in the range of 65 to 69% and agree with those measured by other techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010172830355
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Molecular Modeling of the Complexes between Saccharomyces cerevisiae Phosphoenolpyruvate Carboxykinase and the ATP Analogs Pyridoxal 5′-Diphosphoadenosine and Pyridoxal 5′-Triphosphoadenosine. Specific Labeling of Lysine 290 (2000)
    Springer
    The protein journal 19 (2000), S. 67-73 
    Details
    ISSN: 1573-4943
    Keywords: Homology modeling ; rotational energy barrier ; simulated annealing ; pyridoxal 5′-diphosphoadenosine ; pyridoxal 5′-triphosphoadenosine ; Saccharomyces cerevisiae ; phosphoenolpyruvate carboxykinase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Molecular mechanics calculations have been employed to obtain models of the complexes between Saccharomyces cerevisiae phosphoenolpyruvate (PEP) kinase and the ATP analogs pyridoxal 5′-diphosphoadenosine (PLP-AMP) and pyridoxal 5′-triphosphoadenosine (PLP-ADP), using the crystalline coordinates of the ATP-pyruvate-Mn2+-Mg2+ complex of Escherichia coli PEP carboxykinase [Tari et al. (1997), Nature Struct. Biol. 4, 990–994]. In these models, the preferred conformation of the pyridoxyl moiety of PLP-ADP and PLP-AMP was established through rotational barrier and simulated annealing procedures. Distances from the carbonyl-C of each analog to ε-N of active-site lysyl residues were calculated for the most stable enzyme-analog complex conformation, and it was found that the closest ε-N is that from Lys290, thus predicting Schiff base formation between the corresponding carbonyl and amino groups. This prediction was experimentally verified through chemical modification of S. cerevisiae PEP carboxykinase with PLP-ADP and PLP-AMP. The results here described demonstrate the use of molecular modeling procedures when planning chemical modification of enzyme-active sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007099010762
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Pressure effect on the dynamics of an isolated α-helix studied by 15N-1H NMR relaxation (2000)
    Springer
    Journal of biomolecular NMR 17 (2000), S. 257-263 
    Details
    ISSN: 1573-5001
    Keywords: alpha-helix ; bacteriorhodopsin ; chemical shift anisotropy (CSA) ; dynamics ; high pressure ; hydrogen bond ; spin relaxation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Dynamics and structure of (1–36)bacteriorhodopsin solubilized in chloroform/methanol mixture (1:1) were investigated by 1H-15N NMR spectroscopy under a hydrostatic pressure of 2000 bar. It was shown that the peptide retains its spatial structure at high pressure. 15N transverse and longitudinal relaxation times, 15N{1H} nuclear Overhauser effects, chemical shifts and the translation diffusion rate of the peptide at 2000 bar were compared with the respective data at ambient pressure [Orekhov et al. (1999) J. Biomol. NMR, 14, 345–356]. The model free analysis of the relaxation data for the helical 9–31 fragment revealed that the high pressure decreases the overall rotation and translation diffusion, as well as apparent order parameters of fast picosecond internal motions (S2 f) but has no effect on internal nanosecond motions (S2 s and τs) of the peptide. The decrease of translation and overall rotation diffusion was attributed to the increase in solvent viscosity and the decrease of apparent order parameters S2 f to a compression of hydrogen bonds. It is suggested that this compression causes an elongation of H-N bonds and a decrease of absolute values of chemical shift anisotropy (CSA). In particular, the observed decrease of S2 f at 2000 bar can be explained by 0.001 nm increase of N-H bond lengths and 10 ppm decrease of 15N CSA values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008346414720
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    IR Reflection Spectra of Ferroelectric Ceramics Based on Solid Solutions of Lead Zirconate-Titanate (2000)
    Springer
    Journal of applied spectroscopy 67 (2000), S. 976-980 
    Details
    ISSN: 1573-8647
    Keywords: ferroelectric ceramics ; IR reflection spectra ; ferroelectric-active mode ; perovskite structure ; lead zirconate-titanate ; solid solution ; high pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated the IR reflection spectra of ferroelectric ceramics based on solid solutions of lead zirconate-titanate with a rhombohedral structure obtained by high-pressure cold precompaction. In the 55–65-cm−1 frequency range, we have revealed by experiment that the “soft” ferroelectric-active mode for the ceramics compacted by a higher pressure under the conditions of cold compaction is shifted into the region of lower frequencies. For the ceramics precompacted at various pressures, we have determined the frequencies of longitudinal and transverse phonons and calculated the frequency dependences of the imaginary and real parts of the dielectric constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004168320640
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Partial Assembly of the Yeast Mitochondrial ATP Synthase 1 (2000)
    Springer
    Journal of bioenergetics and biomembranes 32 (2000), S. 391-400 
    Details
    ISSN: 1573-6881
    Keywords: ATP synthase ; F1-ATPase ; Saccharomyces cerevisiae ; petite mutants ; epistasis ; mitochondrion ; pet mutants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Physics
    Notes: Abstract The mitochondrial ATP synthase is a molecular motor that drives the phosphorylation ofADP to ATP. The yeast mitochondrial ATP synthase is composed of at least 19 differentpeptides, which comprise the F1 catalytic domain, the F0 proton pore, and two stalks, oneof which is thought to act as a stator to link and hold F1 to F0, and the other as a rotor.Genetic studies using yeast Saccharomyces cerevisiae have suggested the hypothesis thatthe yeast mitochondrial ATP synthase can be assembled in the absence of 1, and even 2, ofthe polypeptides that are thought to comprise the rotor. However, the enzyme complexassembled in the absence of the rotor is thought to be uncoupled, allowing protons to freelyflow through F0 into the mitochondrial matrix. Left uncontrolled, this is a lethal process andthe cell must eliminate this leak if it is to survive. In yeast, the cell is thought to lose ordelete its mitochondrial DNA (the petite mutation) thereby eliminating the genes encodingessential components of F0. Recent biochemical studies in yeast, and prior studies in E. coli,have provided support for the assembly of a partial ATP synthase in which the ATP synthaseis no longer coupled to proton translocation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005532104617
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Contactless Weighing Up to High Pressures For Analysing Adsorption And Density of Fluids (2000)
    Springer
    Journal of thermal analysis and calorimetry 62 (2000), S. 509-514 
    Details
    ISSN: 1572-8943
    Keywords: active carbons ; adsorption ; high pressure ; magnetic suspension balance ; supercritical fluids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Adsorption of supercritical fluids methane, nitrogen and argon by active carbons was studied up to a pressure of 500 bar. A three-parameter isothermal equation was used to represent the adsorption equilibrium. This isothermal equation is based on a physical model conception which had already been used for the modelling of adsorption processes with a pressure up to 150 bar. Beside the exact knowledge of the measurable parameters pressure, temperature and fluid composition, the density of the adsorbate are essential for the evaluation of the adsorption analysis. The fluid density can be determined either via equations of state, which is normally the most practicable and fastest way, or via lift measurements of a lowering body in the fluid based on the principle of Archimedes. This work represents and discusses the question of to what extent the fluid density determined under real conditions via equations of state, using, for example, equation of Bender, corresponds to the fluid density measured under high-pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010127222643
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Influence of Sr Substitution on Structure, Hole Concentration in CuO2 Planes, and Irreversibility Line in (Hg,Pb)(Ba,Sr)2Ca2Cu3O8+δ Single Crystals (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 877-881 
    Details
    ISSN: 1572-9605
    Keywords: single crystals ; HgBa2Ca2Cu3O8+δ ; high pressure ; substitutions ; irreversibility line
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Single crystals of HgBa2Ca2Cu3O8+δ compound with partial substitution of Sr and Pb have been grown at high gas pressure. Bond valence sum calculations show that the substitution of Sr for Ba leads to a more homogeneous distribution of holes between nonequivalent CuO2 planes. In nonsubstituted crystals, the density of holes is significantly higher in the inner CuO2 planes. The irreversibility field increases on Sr substitution. The thickness of the charge reservoir decreases with Sr substitution by 0.7 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026426501425
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 11
    Electronic Resource
    Electronic Resource
    Localized-Itinerant and Mott–Hubbard Transitions in Several Perovskites (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 989-993 
    Details
    ISSN: 1572-9605
    Keywords: manganese oxides ; high pressure ; charge-density waves ; magnetism ; polarons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The localized-itinerant and Mott–Hubbard transitions in single-valent perovskites are distinguished. The approach to the Mott–Hubbard transition from the itinerant-electron side is characterized by the appearance of strong-correlation fluctuations within a metallic matrix; these fluctuations introduce a Curie–Weiss paramagnetism that is added to a strongly enhanced Pauli paramagnetism. As the critical bandwidth is approached, ordering of the strong-correlation fluctuations into a charge-density wave (CDW) may compete with a global Mott-Hubbard transition. The approach to the localized-itinerant electronic transition from the localized-electron side is illustrated by LaMnO3, where orbital ordering localizes the electrons of e-orbital parentage. In the mixed-valent La1−x Sr x MnO3 system, the doped holes evolve from small polarons to two-manganese Zener polarons to itinerant-electron behavior. The Zener polarons order at low temperatures into a CDW.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026462510687
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    pρT Measurements of Polyethylene Glycol Dimethylethers Between 278.15 and 328.15 K at Pressures to 12 MPa (2000)
    Springer
    International journal of thermophysics 21 (2000), S. 831-851 
    Details
    ISSN: 1572-9567
    Keywords: density ; high pressure ; internal pressure ; isobaric thermal expansion coefficients ; isothermal compressibilities ; liquid ; polyethylene glycol dimethylethers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we present a new experimental apparatus designed to measure pressure–density–temperature (pρT ) properties with a high-pressure vibrating tube densimeter. Data reliability has been verified by comparing our experimental results for methanol, n-heptane, toluene, and HFC-134a with literature data. In this work we also report new experimental densities from 278.15 to 328.15 K, and up to 12 MPa, of triethylene glycol dimethylether (TrEGDME) and tetraethylene glycol dimethylether (TEGDME). The isobaric thermal expansion coefficients, isothermal compressibility, and internal pressure have been calculated. The dependence of these properties on the length of polyethylene glycol dimethylether, CH3O–((CH2)2O) n –CH3, is analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006606122944
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Volume dependence of NMR of ordered correlated electron systems (2000)
    Springer
    Hyperfine interactions 128 (2000), S. 167-181 
    Details
    ISSN: 1572-9540
    Keywords: NMR ; high pressure ; phase transitions ; magnetic materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The importance of NMR high pressure studies of ordered magnetic materials for the understanding of the ground and excited states of magnetic conductors is discussed with examples from recent work on the manganese perovskites and the rare earth compounds SmMn2Ge2 and CeIn3. A brief discussion is given of the difference between true pressure experiments and the “chemical pressure” introduced by changing the composition of a material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012631515382
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Single-crystal neutron diffraction under high pressures: valence instabilities in Tm monochalcogenides (2000)
    Springer
    Hyperfine interactions 128 (2000), S. 207-224 
    Details
    ISSN: 1572-9540
    Keywords: magnetic order ; high pressure ; metal-insulator transition ; Tm monochalcogenides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New high-pressure devices based on the use of sapphire anvils now allow single-crystal neutron diffraction experiments to be performed up to P=8–10 GPa. After giving a brief overview of the technique, we present its application to the study of pressure-induced valence instabilities in Tm monochalcogenides (TmX, X: S, Se, Te). A variety of new magnetic phases have been characterized, yielding a consistent picture of the evolution of magnetism through the series. The results indicate a striking interplay between magnetic order taking place at low temperature and different types of electronic ground states (classical semiconductor, narrow-gap Kondo insulator, metallic Kondo lattice, etc.) inferred from the transport properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012687700361
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Electronic and magnetic studies of materials to megabar pressures (2000)
    Springer
    Hyperfine interactions 128 (2000), S. 323-343 
    Details
    ISSN: 1572-9540
    Keywords: high pressure ; superconductivity ; ferromagnetism ; conductivity ; X-ray emission ; inelastic nuclear resonant scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Numerous recent developments in diamond-cell techniques are making possible a growing range of studies of the electronic and magnetic properties of materials to megabar pressures. We review recent advances in this area, including magnetic susceptibility, electrical conductivity, and synchrotron-based spectroscopic techniques. Highly sensitive magnetic susceptibility techniques have allowed the first observations of superconductivity at megabar pressures, including the observation of a Tc of 17 K in sulfur at 160 GPa, and a nearly pressure-independent Tc to above 230 GPa. The technique has recently been extended to allow measurements of the magnetic properties of ferromagnetic substances. Advances in the direct measurement of electrical conductivity using miniaturized leads have permitted measurements on H2O and Xe to above 100 GPa. Pressure-induced high-spin to low-spin transitions have been examined in FeS and FeO using new high-resolution X-ray emission techniques. New high-pressure inelastic scattering methods, including nuclear inelastic scattering techniques, have been used to determine the phonon density of states of Fe to above 150 GPa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012600103087
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    Substrate specificity of yeast invertase in transglycosylation reactions (2000)
    Springer
    Chemistry of natural compounds 36 (2000), S. 88-89 
    Details
    ISSN: 1573-8388
    Keywords: Saccharomyces cerevisiae ; yeast invertase ; active enzyme
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The substrate specificity of purified yeast invertase isolated fromSaccharomyces cerevisiae in transglycosylation reactions was determined. The enzyme is specific for primary alcohols. The yeast activity is a function of the alkyl length and substrate hydrophobicity (n-butyl, isobutyl, isoamyl alcohols).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02234911
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    Electronic Resource
    Electronic Resource
    Identification of a fungal triacetylfusarinine C siderophore transport gene (TAF1) in Saccharomyces cerevisiae as a member of the major facilitator superfamily (1999)
    Springer
    BioMetals 12 (1999), S. 301-306 
    Details
    ISSN: 1572-8773
    Keywords: iron ; siderophores ; transport ; Saccharomyces cerevisiae ; fungi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Transport proteins of microorganisms may either belong to the ATP-binding cassette (ABC) superfamily or to the major facilitator (MFS)-superfamily. MFS transporters are single-polypeptide membrane transporters that transport small molecules via uniport, symport or antiport mechanisms in response to a chemiosmotic gradient. Although Saccharomyces cerevisiae is a non-siderophore producer, various bacterial and fungal siderophores can be utilized as an iron source. From yeast genome sequencing data six genes of the unknown major facilitator (UMF) family were known of which YEL065w Sce was recently identified as a transporter for the bacterial siderophore ferrioxamine B (Sit1p). The present investigation shows that another UMF gene, YHL047c Sce, encodes a transporter for the fungal siderophore triacetylfusarinine C. The gene YHL047c Sce (designated TAF1) was disrupted using the kanMX disruption module in a fet3 background (strain DEY 1394 Δfet3), possessing a defect in the high affinity ferrous iron transport. Growth promotion assays and transport experiments with 55Fe-labelled triacetylfusarinine C showed a complete loss of iron utilization and uptake in the disrupted strain, indicating that TAF1 is the gene for the fungal triacetylfusarinine transport in Saccharomyces cerevisiae and possibly in other siderophore producing fungi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009252118050
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    Combined Flow-Mixing Power-Compensation Calorimeter and Vibrating Tube Densimeter for Measurements at Superambient Condition (1999)
    Springer
    Journal of solution chemistry 28 (1999), S. 631-666 
    Details
    ISSN: 1572-8927
    Keywords: Flow calorimetry ; vibrating tube densimetry ; heat of mixing ; volume of mixing ; high temperature ; high pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new instrument combining a flow-mixing calorimeter and a vibrating tube densimeter inside a thermostatted environment has been constructed. The instrument is designed for simultaneous measurements of calorimetric and volumetric properties at superambient conditions on mixtures for which both pure components are liquid at room temperature or one component is a liquid and the other is gaseous. The system yields simultaneously two properties: (1) the enthalpy of mixing determined in a heat-leak calorimeter with power compensation; (2) the density difference between a mixture (solution) and a reference liquid measured as a change in frequency of a tube vibrating in a field of permanent magnets. The instrument was tested in the full concentration range using aqueous ethanol and aqueous methanol. The results are presented at temperatures between 348 and 573 K and pressures from 5 to 20 MPa for mixing enthalpies ΔH mix ranging from −160 to 5700 J-mol−1. The corresponding heating powers are between −60 and 850 mW, respectively. The results for ΔV mix of mixing volumes were measurable from 348 K to 523 and between 5 and 13 MPa with the maximum volume change being −4.0 cm3-mol−1. The errors in ΔH mix and ΔV mix near mole fraction of 0.5 are believed to be less than 5% over the temperature and pressure ranges given above.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021759810070
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    High-Pressure Liquid-Liquid Immiscibility in Aqueous Solutions of Tetra-n-butylammonium Bromide Studied by a Diamond Anvil Cell Technique (1999)
    Springer
    Journal of solution chemistry 28 (1999), S. 435-446 
    Details
    ISSN: 1572-8927
    Keywords: Liquid–liquid phase equilibria ; high pressure ; water ; tetrabutyl-ammonium bromide ; hydrophobic effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract By use of a diamond anvil cell, we show that at high pressures aqueous solutions of tetra-n-butylammonium bromide form a closed liquid–liquid immiscibility loop with a critical concentration of about 2.0 mol-kg−1. We report data for a near-critical isopleth, which describes the pressure dependence of the upper and lower consolute points. At about 700 MPa and 373 K both consolute points coincide to form a hypercritical point, which characterizes the minimum pressure to achieve immiscibility. We show that this immiscibility can be rationalized in terms of Pitzer's ion-interaction theory. We determine the ion-interaction parameters of Pitzer's theory up to 423 K at normal pressure. Inclusion of volumetric data gives the correct trend toward a high-pressure immiscibility. We discuss the results in terms of the interplay between ionic and hydrophobic forces in this system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022612029577
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    Interaction of Saccharomyces cerevisiae with gold: toxicity and accumulation (1999)
    Springer
    BioMetals 12 (1999), S. 289-294 
    Details
    ISSN: 1572-8773
    Keywords: accumulation ; gold ; proton efflux ; Saccharomyces cerevisiae ; toxicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract This paper examines the effects of ionic gold on Saccharomyces cerevisiae, as determined by long-term (growth in gold-containing media) and short-term interactions (H+ efflux activity). An increasing gold concentration inhibited growth and at 〈0.2 mM Au, growth was not observed. Transmission electron microscopy revealed no differences in ultrastructure but fine electron dense particles were observed in unstained preparations from gold-containing medium. After glucose addition (to 10mM) to starved suspensions of S. cerevisiae, glucose-dependent reduction of external pH occurred as the cells extruded protons. In the presence of increasing gold concentrations, the lag time before proton extrusion did not change but the rate and duration decreased significantly with a marked influence on proton efflux rate being observed at ≤ 10 μM. Extension of preincubation time of yeast cells in gold-containing medium resulted in a decreasing proton efflux rate and colloidal phase formation in the cell suspensions, the time between gold addition and the beginning of colloidal phase formation depending on the gold concentration used. Both Ca and Mg enhanced the inhibitory effect of gold on the yeast cells with Ca showing a stronger inhibitory effect than Mg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009210101628
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 21
    Electronic Resource
    Electronic Resource
    An infrared spectroscopic study of lawsonite to 20 GPa (1999)
    Springer
    Physics and chemistry of minerals 26 (1999), S. 437-445 
    Details
    ISSN: 1432-2021
    Keywords: Key words lawsonite ; high pressure ; infrared spectroscopy ; hydrogen bonding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract The infrared spectrum of CaAl2Si2O7 · H2O-lawsonite, has been characterized to pressures of 20 GPa at 300 K. Our results constrain the response to compression of the silicate tetrahedra, hydroxyl units, and water molecules in this material. The asymmetric and symmetric stretching and bending vibrations of the Si2O7 groups (at zero pressure frequencies between 600 and 1000 cm−1) increase in frequency with pressure at rates between 3.6 and 5.9 cm−1/GPa. All silicate modes appear to shift continuously with pressure to 20 GPa, although the lowest frequency stretching vibration becomes unresolvable above 18 GPa, and a splitting of the main bending vibration is observed near this pressure. The O-H stretches of the hydroxyl units exhibit a discontinuity in their mode shifts at ∼8–9 GPa, which we interpret to be produced by a pressure-induced change in hydrogen bonding. The stretching and bending vibrations of the water molecule are relatively unaffected by compression to 20 GPa, thus demonstrating that the structural cavities in which water molecules reside are relatively rigid. Significant changes in the amplitude of the O-H stretches of the hydroxyl and water units are observed at this pressure as well; nevertheless, our results demonstrate that the dominant structural units in lawsonite persist metastably at 300 K with only modest structural modifications well beyond the known stability field of this phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002690050206
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 22
    Electronic Resource
    Electronic Resource
    A strange calmodulin of yeast (1999)
    Springer
    Molecular and cellular biochemistry 190 (1999), S. 47-54 
    Details
    ISSN: 1573-4919
    Keywords: calmodulin ; yeast calmodulin ; Ca2+ binding ; Ca2+ binding protein ; Saccharomyces cerevisiae ; interdomain interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Calmodulin of Saccharomyces cerevisiae has different Ca2+ binding properties from other calmodulins. We previously reported that the maximum number of Ca2+ binding was 3 mol/mol and the fourth binding site was defective, which was different from 4 mol/mol for others. Their macroscopic dissociation constants suggested the cooperative three Ca2+ bindings rather than a pair of cooperative two Ca2+ bindings of ordinary calmodulin. Here we present evidence for yeast calmodulin showing the intramolecular close interaction between the N-terminal half domain and the C-terminal half domain, while the two domains of ordinary calmodulin are independent of each other. We will discuss the relationship of the shape and the shape change caused by the Ca2+ binding to the enzyme activation in yeast. The functional feature of calmodulin in yeast will also be considered, which might be different from the one of vertebrate calmodulin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006951710440
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 23
    Electronic Resource
    Electronic Resource
    Characterization of Saccharomyces cerevisiae strains expressing ira1 mutant alleles modeled after disease-causing mutations in NF1 (1999)
    Springer
    Molecular and cellular biochemistry 202 (1999), S. 109-118 
    Details
    ISSN: 1573-4919
    Keywords: NF1 mutations ; IRA1 ; Saccharomyces cerevisiae ; RAS2 ; GAP activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The 2818 amino acids of neurofibromin, the product of the human NF1 gene, include a 230 amino acid Ras-GAP related domain (GRD). Functions which may be associated with the rest of the protein remain unknown. However, many NF1 mutations in neurofibromatosis 1 patients are found downstream of the GRD, suggesting that the C-terminal region of the protein is also functionally important. Since the C-terminal region of neurofibromin encompassing these mutations is homologous with the corresponding regions in the two Saccharomyces cerevisiae Ras-GAPs, Ira1p and Ira2p, we chose yeast as a model system for functional exploration of this region (Ira-C region). Three missense mutations that affect the Ira-C region of NF1 were used as a model for the mutagenesis of IRA1. The yeast phenotypes of heat shock sensitivity, iodine staining, sporulation efficiency, pseudohyphae formation, and GAP activity were scored. Even though none of the mutations directly affected the Ira1p-GRD, mutations at two of the three sites resulted in a decrease in the GAP activity present in ira1 cells. The third mutation appeared to disassociate the phenotypes of sporulation ability and GAP activity. This and other evidence suggest an effector function for Ira1p.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007058427880
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 24
    Electronic Resource
    Electronic Resource
    Direct observation of oxidative stress on the cell wall of Saccharomyces cerevisiae strains with atomic force microscopy (1999)
    Springer
    Molecular and cellular biochemistry 201 (1999), S. 17-24 
    Details
    ISSN: 1573-4919
    Keywords: Saccharomyces cerevisiae ; atomic force microscope ; bioscope ; organic synthesis ; molecular biology ; oxidative stress ; pore enlargement ; cell wall ; baker's yeast ; biotechnology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract We imaged pores on the surface of the cell wall of three different industrial strains of Saccharomyces cerevisiae using atomic force microscopy. The pores could be enlarged using 10 mM diamide, an SH residue oxidant that attacks surface proteins. We found that two strains showed signs of oxidative damage via changes in density and diameter of the surface pores. We found that the German strain was resistant to diamide induced oxidative damage, even when the concentration of the oxidant was increased to 50 mM. The normal pore size found on the cell walls of American strains had diameters of about 200nm. Under conditions of oxidative stress the diameters changed to 400nm. This method may prove to be a useful rapid screening process (45-60 min) to determine which strains are oxidative resistant, as well as being able to screen for groups of yeast that are sensitive to oxidative stress. This rapid screening tool may have direct applications in molecular biology (transference of the genes to inside of living cells) and biotechnology (biotransformations reactions to produce chiral synthons in organic chemistry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007007704657
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 25
    Electronic Resource
    Electronic Resource
    Molecular surface studies of adsorption and catalytic reaction on crystal (Pt, Rh) surfaces under high pressure conditions (atmospheres) using sum frequency generation (SFG) – surface vibrational spectroscopy and scanning tunneling microscopy (STM) (1999)
    Springer
    Topics in catalysis 8 (1999), S. 23-34 
    Details
    ISSN: 1572-9028
    Keywords: Pt(111) ; Rh(111) ; Pt(100) ; high pressure ; SFG ; STM ; CO oxidation ; CO adsorption ; cyclohexene ; hydrogenation ; dehydrogenation ; cyclohexadiene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Sum frequency generation (SFG) – surface vibrational spectroscopy and the scanning tunneling microscope (STM) have been used to study adsorption and catalyzed surface reactions at high pressures and temperatures using (111) crystal surfaces of platinum and rhodium. The two techniques and the reaction chambers that were constructed to make these studies possible are described. STM and SFG studies of CO at high pressures reveal the high mobility of metal atoms, metal surface reconstruction, ordering in the adsorbed molecular layer, and new binding states for the molecule. CO oxidation occurs at high turnover rates on Pt(111). Different adsorbed species are observed above and below the ignition temperature. Some inhibit the reaction, and others are reaction intermediates since their surface concentration is proportional to the reaction rate. The dehydrogenation of cyclohexene on Pt(100) and Pt(111) proceeds through a 1,3‐cyclohexadiene surface intermediate. The higher dehydrogenation rate is related to the higher surface concentration of these molecules on the (100) crystal face.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019152909371
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 26
    Electronic Resource
    Electronic Resource
    Characterization of the Oxaloacetate Decarboxylase and Pyruvate Kinase-like Activities of Saccharomyces cerevisiae and Anaerobiospirillum succiniciproducens Phosphoenolpyruvate Carboxykinases (1999)
    Springer
    The protein journal 18 (1999), S. 659-664 
    Details
    ISSN: 1573-4943
    Keywords: Phosphoenolpyruvate carboxykinase ; oxaloacetate decarboxylase ; pyruvate kinase-like activity ; Anaerobiospirillum succiniciproducens ; Saccharomyces cerevisiae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Two members of the ATP-dependent class of phosphoenolpyruvate carboxykinases (PEPCKs) (Saccharomyces cerevisiae and Anaerobiospirillum succiniciproducens) have been comparatively studied with regard to their oxaloacetate (OAA) decarboxylase and pyruvate kinase-like activities. The pyruvate kinase-like activities were dependent on the presence of Mn2+; at the same concentrations Mg2+ was not effective. These activities were synergistically activated by a combination of both metal ions. V max for these activities in A. succiniciproducens and S. cerevisiae PEPCKs was 0.13% and 1.2% that of the principal reaction, respectively. The OAA decarboxylase activity was nucleotide independent and, with decreasing order of effectiveness, these activities were supported by Mn2+ and Mg2+. AMP is an activator of these reactions. V max for the OAA decarboxylase activities in A. succiniciproducens and S. cerevisiae PEPCKs was 4% and 0.2% that of the PEP-forming reaction, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020602222808
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 27
    Electronic Resource
    Electronic Resource
    The Role of the Amino-Terminal β-Barrel Domain of the α and β Subunits in the Yeast F1-ATPase (1999)
    Springer
    Journal of bioenergetics and biomembranes 31 (1999), S. 95-104 
    Details
    ISSN: 1573-6881
    Keywords: F1-ATPase ; β-barrel domain ; mitochondria ; assembly ; yeast ; Saccharomyces cerevisiae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Physics
    Notes: Abstract The crystal structure of mitochondrial F1-ATPase indicatesthat the α and β subunits fold into a structure defined by threedomains: the top β-barrel domain, the middle nucleotide-binding domain,and the C-terminal α-helix bundle domain (Abraham et al.1994); Bianchet et al., 1998). The β-barrel domains of theα and β subunits form a crown structure at the top ofF1, which was suggested to stabilize it (Abraham et al.1994). In this study. the role of the β-barrel domain in the α andβ subunits of the yeast Saccharomyces cerevisiae F1,with regard to its folding and assembly, was investigated. The β-barreldomains of yeast F1 α and β subunits were expressedindividually and together in Escherichia coli. When expressedseperately, the β-barrel domain of the β subunit formed a largeaggregate structure, while the domain of the α subunit waspredominately a monomer or dimer. However, coexpression of the β-barreldomain of α subunit domain. Furthermore, the two domains copurified incomplexes with the major portion of the complex found in a small molecularweight form. These results indicate that the β-barrel domain of theα and β subunits interact specifically with each other and thatthese interactions prevent the aggregation of the β-barrel domain of theβ subunit. These results mimic in vivo results and suggest thatthe interactions of the β-barrel domains may be critical during thefolding and assembly of F1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005443609985
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 28
    Electronic Resource
    Electronic Resource
    Measurements of the Thermal Conductivity of HFC-125 in the Temperature Range from 300 to 515 K at Pressures up to 53 Mpa (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 375-399 
    Details
    ISSN: 1572-9567
    Keywords: coaxial cylinders ; high pressure ; refrigerants ; HFC-125 ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the thermal conductivity of HFC-125 that have been made by a coaxial cylinder cell operating in steady state are reported. The measurements of the thermal conductivity of HFC-125 were performed along several quasi-isotherms between 300 and 515 K in the gas phase and the liquid phase. The pressure range covered varies from 0.1 to 53 MPa. Based on the measurement of more than 600 points, an empirical equation is provided to describe the thermal conductivity outside the critical region as a function of temperature and density. A careful analysis of the various sources of error leads to an estimated uncertainty of approximately ± 1.5%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022692601764
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 29
    Electronic Resource
    Electronic Resource
    Thermodynamic Properties of Air from 60 to 2000 K at Pressures up to 2000 MPa (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 217-228 
    Details
    ISSN: 1572-9567
    Keywords: air ; equation of state ; fundamental equation ; high pressure ; high temperature ; thermodynamic properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A thermodynamic property formulation for standard dry air based upon experimental P–ρ–T, heat capacity, and speed of sound data and predicted values, which extends the range of prior formulations to higher pressures and temperatures, is presented. This formulation is valid for temperatures from the solidification temperature at the bubble point curve (59.75 K) to 2000 K at pressures up to 2000 MPa. In the absence of experimental air data above 873 K and 70 MPa, air properties were predicted from nitrogen data. These values were included in the fit to extend the range of the fundamental equation. Experimental shock tube measurements ensure reasonable extrapolated properties up to temperatures and pressures of 5000 K and 28 GPa. In the range from the solidification point to 873 K at pressures to 70 MPa, the estimated uncertainty of density values calculated with the fundamental equation for the vapor is ±0.1%. The uncertainty in calculated liquid densities is ±0.2%. The estimated uncertainty of calculated heat capacities is ±1% and that for calculated speed of sound values is ±0.2%. At temperatures above 873 K and 70 MPa, the estimated uncertainty of calculated density values is ±0.5%, increasing to ±1% at 2000 K and 2000 MPa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021450818807
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 30
    Electronic Resource
    Electronic Resource
    Dependence of the Melting Temperature on Pressure up to 2000 Bar in Uranium Dioxide, Tungsten, and Graphite (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 1177-1188 
    Details
    ISSN: 1572-9567
    Keywords: graphite ; high pressure ; laser pulse ; melting point ; tungsten ; uranium dioxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The melting points of uranium dioxide, tungsten, and graphite were measured as a function of the isostatic pressure up to 2000 bar (200 MPa), in a laser-heated autoclave filled with inert gas. The measured melting curves and their slopes were compared with predictions obtained from the Clausius–Clapeyron equation and existing thermochemical data of these substances. While for tungsten and graphite the results show reasonable agreement with the equilibrium thermodynamic calculations, the melting point of UO2 increases with pressure with a slope more than three times larger than expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022667206867
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 31
    Electronic Resource
    Electronic Resource
    Melting-Point Measurements at High Static Pressures from Laser Heating Methods: Application to Uranium (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 1189-1198 
    Details
    ISSN: 1572-9567
    Keywords: diamond anvil cell ; emissivity ; high pressure ; laser heating ; melting ; uranium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two experimental approaches dealing with the determination of melting at high static pressures are described and analyzed. With the sample squeezed inside a diamond anvil cell, high temperatures up to the solid–liquid transition are obtained using Nd:YAG laser heating. Two methods have been investigated. In the first technique, the heating is accomplished with a pulsed laser and the brief radiation variations (t〈10 ms) emitted from the sample are recorded with two high-speed infrared detectors. The melting location is defined by a plateau or changes of slope of the signals, and the temperatures are calculated by assuming a constant value of emissivity factor at the end of the transition over the studied pressure range. The second system employs a continuous laser and a two-dimensional CCD detector to measure temperatures using multispectral pyrometry. Melting is detected from criteria related either to textural change in the sample involving interference contrast under a laser illumination or to the specific variations of temperature and emissivity as a function of laser power. Thermal radiation is fitted to Planck's law with temperature and emissivity as the free parameters. Advantages and drawbacks are presented from results obtained on pure uranium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022619323705
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 32
    Electronic Resource
    Electronic Resource
    Relative Permittivity and Resistivity of Liquid HFC Refrigerants Under High Pressure (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 107-117 
    Details
    ISSN: 1572-9567
    Keywords: dielectric constant ; electrical resistivity ; HFC-236ea ; HFC-245fa ; hydrofluorocarbon ; permittivity ; high pressure ; refrigerants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The static relative permittivity (dielectric constant) and the resistivity of HFC-236ea (CF3–CHF–CHF2) and HFC-245fa (CF3–CH2–CHF2) in the liquid phase were studied at temperatures from 293 to 343 K and pressures from 0.1 to 50 MPa. The relative permittivity was measured by a concentric-cylinder-type capacitance cell with an LCR meter with an uncertainty of less than 0.1%. The resistivity was measured by a high resistance meter using plane-parallel platinum electrodes installed in a borosilicate glass syringe. It was found that the relative permittivities and the resistivities of liquid HFC-236ea and HFC-245fa at 303 K and 0.101325 MPa are about 5.13 and 6.54 and 1.5×1010 and 0.2×1010 Ω·cm, respectively. The relative permittivity and the resistivity increase monotonically with increasing pressure and decreasing temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021430214264
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 33
    Electronic Resource
    Electronic Resource
    Thermal Conductivity Measurements of Aqueous SrCl2 and Sr(NO3)2 Solutions in the Temperature Range Between 293 and 473 K at Pressures up to 100 MPa (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 187-196 
    Details
    ISSN: 1572-9567
    Keywords: aqueous solutions ; density ; high pressure ; parallel-plate method ; salt ; thermal conductivity ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Accurate high-pressure thermal conductivity measurements have been performed on H2O+SrCl2 and H2O+Sr(NO3)2 mixtures at pressures up to 100 MPa over a temperature range between 293 and 473 K using a parallel-plate apparatus. The concentrations studied were 0.025, 0.05, 0.10, 0.15, and 0.20 mass fraction of the salts. The estimated accuracy of the method is about ±1.6%. The pressure, temperature, and concentration dependences of the thermal conductivity have been studied. Measurements were made on six isobars, namely, 0.1, 20, 40, 60, 80, and 100 MPa. The thermal conductivity shows a linear dependence on pressure and concentration for all isotherms. Along each isobar, a given concentration shows the thermal-conductivity maximum at a temperature of about 413 K. The measured values of thermal conductivity at atmospheric pressure are compared with the results of other investigators. Literature data at atmospheric pressure reported by Ridel and by Zaitzev and Aseev agree with our thermal conductivity values within the estimated uncertainty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021494601060
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 34
    Electronic Resource
    Electronic Resource
    Vibrational Spectra of Nitrogen in Simple Mixtures at High Pressures (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 867-876 
    Details
    ISSN: 1572-9567
    Keywords: dilute mixtures ; high pressure ; high-resolution Raman spectroscopy ; line width ; nitrogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Previous investigations have revealed a considerable difference between the spectral behavior of a molecule in a pure substance and that in a mixture. To gain more insight into the influence of the intermolecular interaction and of the mass of the molecules, we performed high-resolution measurements of the linewidths and peak positions of the vibrational Raman spectrum of pure nitrogen, nitrogen in argon, and nitrogen in helium. The research was carried out at room temperature and at pressures up to the melting line. It turns out that, in contrast with expectation, the linewidth as well as the frequency shift is essentially the same for pure nitrogen as for nitrogen diluted in argon, although both the mass and the potential well depth are quite different. The experimental results show the same tendency as recent computer simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022635203155
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 35
    Electronic Resource
    Electronic Resource
    Determination of the Critical Point of Gold (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 1289-1297 
    Details
    ISSN: 1572-9567
    Keywords: critical point ; electrical resistivity ; enthalpy ; gold ; high pressure ; high temperature ; liquid metals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Wire-shaped gold specimens are placed in a new, improved high-pressure vessel, which is part of a fast capacitor-discharge circuit and in which static pressures above 600 MPa can be reached with distilled water as the pressure-transmitting medium. The specimens are self-heated resistively by a current pulse. The current through the specimen, the voltage drop across it, and its temperature are recorded as a function of time with submicrosecond resolution. The radial expansion of the specimen is determined with a CCD camera, Experiments are performed at different pressures. When the critical pressure is exceeded, there is no liquid–gas phase transition; hence, no sudden change in the thermal expansion rate is observed. The results for temperature, pressure, and specific volume at the critical point of gold are as follows: T c =7400±1100 K, p c=530±20 MPa, and v c=0.13±0.03 × 10−3m3·kg−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022687811410
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 36
    Electronic Resource
    Electronic Resource
    Measurements of the Thermal Conductivity of HFC-134a in the Temperature Range from 300 to 530 K and at Pressures up to 50 MPa (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 1379-1401 
    Details
    ISSN: 1572-9567
    Keywords: coaxial cylinders ; HFC-134a ; high pressure ; high temperature ; refrigerant ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the thermal conductivity of HFC-134a made in a coaxial cylinder cell operating in steady state are reported. The measurements of the thermal conductivity of HFC-134a were performed along several quasi-isotherms between 300 and 530 K in the gas phase and the liquid phase. The pressure ranged from 0.1 to 50 MPa. Based on the experimental data, a background equation is provided to calculate the thermal conductivity outside the critical region as a function of temperature and pressure. A careful analysis of the various sources of errors leads to an estimated uncertainty of ±1.5%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021480803361
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 37
    Electronic Resource
    Electronic Resource
    Facility for preparation of gas mixture in muon catalyzed fusion experiments (1999)
    Springer
    Hyperfine interactions 119 (1999), S. 341-344 
    Details
    ISSN: 1572-9540
    Keywords: high pressure ; tritium ; muon-catalyzed fusion ; tritium safety ; hydrogen isotope mixture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A facility is described that allows safe handling of high tritium gas activity as dozens kilocuries in a regular laboratory environment. It is used to make and deliver into the target a mixture of specific isotopic composition with the contamination requirement of 10-7 v.f. for Z〉1 elements, and recover it upon completion of operation. With this facility, efforts have been accomplished to investigate into the muon catalyzed fusion on two targets – liquid tritium and high-pressure tritium types. Also, the operation range was 0.1–120 MPa for pressure and 20–800 K for temperature and the amount of tritium used was about 100 kCi. The facility showed reliability in operation without indications of radiation beyond the safety level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012684819789
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 38
    Electronic Resource
    Electronic Resource
    High-pressure studies with nuclear scattering of synchrotron radiation (1999)
    Springer
    Hyperfine interactions 123-124 (1999), S. 529-559 
    Details
    ISSN: 1572-9540
    Keywords: high pressure ; magnetism ; valence transition ; phase transition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The nuclear forward scattering (NFS) of synchrotron radiation is especially suited for probing magnetism at high pressure (h.p.), here in the Mbar range, by the nuclear resonances of 57Fe and 151Eu. We report on high-pressure NFS studies with the 14.4 keV transition of 57Fe, presenting at first the pressure induced α–ε transformation in iron. Then a systematic study of magnetic RFe2 Laves phases of cubic C15 structure (YFe2, GdFe2) and hexagonal C14 structure (ScFe2, TiFe2) at pressures up to 100 GPa (= 1 Mbar) is given. First, high-pressure NFS studies performed with the 21.5 keV resonance of 151Eu are also presented, probing valence transitions in EuNi2Ge2 and the magnetism in the CsCl-type h.p. phase of EuTe. Finally, we discuss future applications, such as high-pressure studies of phonon densities of states, using the inelastic channel of nuclear scattering of synchrotron radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017032125551
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 39
    Electronic Resource
    Electronic Resource
    Tritium high pressure target (1999)
    Springer
    Hyperfine interactions 119 (1999), S. 353-355 
    Details
    ISSN: 1572-9540
    Keywords: muon ; fusion ; high pressure ; tritium ; target
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The design of a tritium high pressure target with a volume of 16.5 cm3, developed at the RFNC-VNIIEF for research of muon fusion catalyzed in a H-D-T hydrogen isotopic mixture at pressures up to 120 MPa in the range of operating temperatures 300-800 K, is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012641004768
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 40
    Electronic Resource
    Electronic Resource
    Catalysis and high pressure – a useful liaison?! (1998)
    Springer
    Topics in catalysis 5 (1998), S. 105-112 
    Details
    ISSN: 1572-9028
    Keywords: high pressure ; palladium ; Diels–Alder reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The influence of high pressure (1–10 kbar) in solution on transition metal and in particular on palladium catalyzed reactions is examined both under the aspect of reactivity as well as selectivity. Although the field of research described here is rather young, some general conclusion on the scope and limitation of high pressure for catalysis can be drawn.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019129414880
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 41
    Electronic Resource
    Electronic Resource
    High resolution NMR techniques in catalysis (1998)
    Springer
    Topics in catalysis 5 (1998), S. 133-147 
    Details
    ISSN: 1572-9028
    Keywords: NMR ; catalysis ; high pressure ; dynamic equilibria ; magnetization transfer ; sapphire tube ; gas phase ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract High resolution NMR techniques are applicable to a variety of aspects of catalysis. Methods for studying homogeneously-catalyzed systems under high gas pressure are described along with approaches for obtaining mechanistic and dynamic information. Many of the same techniques may be applied to heterogeneous catalysis by following the reaction chemistry by gas phase NMR.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019133515789
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 42
    Electronic Resource
    Electronic Resource
    Single Crystals of HgBa2Can−1CunO2n+2+δ (n=1−5) and Layers of HgBa2CuO4+δ Grown at Gas Pressure 10 kbar (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 119-122 
    Details
    ISSN: 1572-9605
    Keywords: Single crystals ; high pressure ; layers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Single crystals of Hg-12(n−l) have been grown using high-pressure gas-technique. Due to the high density of Ar gas at 10 kbar the evaporation of Hg is strongly suppresed. An influence of structure defects on magnetic properties will be discussed. Superconducting parameters λ ab ,ξ ab and γ have been studied using torque magnetometry. Layers of Hg-1201 compound have been grown from flux.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022675105920
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 43
    Electronic Resource
    Electronic Resource
    Yeast mitochondrial metabolism: From in vitro to in situ quantitative study (1998)
    Springer
    Molecular and cellular biochemistry 184 (1998), S. 67-79 
    Details
    ISSN: 1573-4919
    Keywords: Saccharomyces cerevisiae ; spheroplast ; permeabilization ; mitochondria ; oxidative phosphorylation ; porin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract In this work, we first compared yeast mitochondrial oxidative metabolism at different levels of organization: whole cells (C), spheroplasts (S), permeabilized spheroplasts (PS) or isolated mitochondria (M). At present, S are more suitable for use than C for biochemical techniques such as fast extraction of metabolises and permeabilization. We show here that respiratory rates of S with various substrates are similar to C, which demonstrate that they are adapted to yeast bioenergetic studies. It appeared from ethanol metabolism ± NAD++ or NADH respiratory rates on PS that ethanol metabolism was largely cytosolic; moreover, the activity of NADH dehydrogenase was lesser in the case of PS than in S. By comparing PS and M, the biggest difference concerned the respiratory rates of pyruvate and pyruvate-malate, which were much lower for M. Thus mitochondria preparation caused an unidentified loss involved directly in pyruvate metabolism. When the respiratory rate was lowered as a consequence of a high kinetic control of oxidative activity upstream from the respiratory chain, a similar correlation between the increase in ATP/O and decrease in respiratory rate was observed. So, the intrinsic uncoupling of proton pumps is not a particularity of M. Secondly, we demonstrate the existence of a mechanism of retarded diffusion in yeast similar to that already observed in permeabilized mammalian cells for ADP. Such a mechanism also occurs in yeast for several respiratory substrates: the K0.5 for each substrate toward the respiration rate in PS always exceeds that for M. It is proposed that such a discrepancy is due to a restriction of metabolite movement across the outer mitochondrial membrane in permeabilized cells, i.e. regulation of the substrate permeability through porin channels. In the porin-deficient yeast mutant, the K0.5 for NADH is not significantly different in either M or PS and is comparable to that of the parent strain PS. This result confirms that this retarded diffusion is essentially due to the opening-closing of the porin channel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006830810440
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 44
    Electronic Resource
    Electronic Resource
    Comparison of biochemical effects produced by calcium ions and by monomers of polyacrylamide (acrylamide and bisacrylamide) on strains of Saccharomyces cerevisiae used for production of chiral synthons (1998)
    Springer
    Molecular and cellular biochemistry 178 (1998), S. 33-40 
    Details
    ISSN: 1573-4919
    Keywords: Saccharomyces cerevisiae ; NAD(P)H ; calcium ions ; cells immobilization ; oxygen consumption ; biotransformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The biochemical behaviour of four commercial strains of Saccharomyces cerevisiae was studied in the presence of calcium ions, acrylamide and bisacrylamide. Calcium ions at a concentration of 300 µM induced an increase of NAD(P)+ reduction in commercial Turkish and American strains, while in Chilean and Brazilian commercial strains, it diminished NAD(P)+ reduction. On the other hand, polyacrylamide monomers (acrylamide and bisacrylamide) induced a decrease of NAD(P)+ reduction in all strains studied in this paper. When membrane potential (ΔΨ) and oxygen consumption were measured in the presence of polyacrylamide monomers, a decrease of both was observed in all strains studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006834404049
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 45
    Electronic Resource
    Electronic Resource
    The use of molecular modelling in the understanding of configurational specificity (R or S) in asymmetric reactions catalyzed by Saccharomyces cerevisiae or isolated dehydrogenases (1998)
    Springer
    Molecular and cellular biochemistry 178 (1998), S. 27-31 
    Details
    ISSN: 1573-4919
    Keywords: Saccharomyces cerevisiae ; microorganisms ; dehydrogenases ; acetoacetate ; molecular modelling ; enantiomeric excess ; biotransformation ; baker's yeast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract This method gives a general ideal how to use crystallographic information of enzymes to understand reactions catalyzed by these biocatalysts, commonly used by biochemists to produce chiral products. The interactions of three acetoacetic esters with the enzymes L-lactate dehydrogenase and alcohol dehydrogenase were studied through molecular modelling computer program. These artificial substrates have been widely used to produce chiral synthons. Through this methodology it was possible to understand the conformational specificity of these enzymes with respect to the products and how these enzymes can be inhibited by modifying the structures of the artificial substrates. Also, it was possible to predict whether some type of artificial substrate will suffer reduction by cells that contain these dehydrogenases and what kind of configuration (R or S) the final product will have.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006831902849
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 46
    Electronic Resource
    Electronic Resource
    Characterization of oligosaccharides from an antigenic mannan of Saccharomyces cerevisiae (1998)
    Springer
    Glycoconjugate journal 15 (1998), S. 815-822 
    Details
    ISSN: 1573-4986
    Keywords: Saccharomyces cerevisiae ; oligosaccharide structure ; antigenic glycoprotein ; mannan ; allergens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Mannans of the yeast Saccharomyces cerevisiae have been implicated as containing the allergens to which bakers and brewers are sensitive and also the antigen recognized by patients with Crohn's disease. A fraction of S. cerevisiae mannan, Sc500, having high affinity for antibodies in Crohn's patients has been characterized by NMR spectroscopy followed by fragmentation using alkaline elimination, partial acid hydrolysis and acetolysis. The released oligosaccharides were separated by gel filtration on a Biogel P4 column and analyzed by fluorescence labeling, HPLC and methylation analysis. The relationship between structure and antigen activity was measured by competitive ELISA. The antigenic activity of the original high molecular weight mannan could be ascribed to terminal Manα1→3Manα1→2 sequences which are rarely found in human glycoproteins but were over-represented in Sc500 compared to other yeast mannans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006968117252
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 47
    Electronic Resource
    Electronic Resource
    Effects of salt on the temperature and pressure responsive properties of poly(N-vinylisobutyramide) aqueous solutions (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 529-533 
    Details
    ISSN: 1435-1536
    Keywords: Key words Poly(N-vinyliso-butyramide ; poly(N-isopropyl-acrylamide) ; cloud point ; salting out ; thermoresponsive polymer ; high pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  We examined the effects of salt on the lower critical solution temperature (LCST) and lower critical solution pressure (LCSP) of aqueous solutions of poly (N-vinylisobutyramide), polyNVIBA, and compared them with those on poly(N-isopropylacrylamide), polyNIPAAm. We found that the addition of salt (such as Na2SO4, NaCl, or KCl) decreased the LCST of aqueous polyNVIBA from 45 °C to below 20 °C, almost linearly with the salt concentrations and dependent on the type of salt. We observed a similar concentration-dependent decrease in LCST for polyNIPAAm. When KI or NaSCN was added to each aqueous polymer solution, some smaller increases in LCST were observed at relatively low salt concentrations; higher concentrations of salt gave an almost linear decrease in LCST. As for LCSP, the addition of most types of salt lowered the transition pressure, but the effects were much more dependent on the type and the valence of the salt (especially of anion) in both polymers. Salt with divalent anion showed a larger decrease in LCSP, but those with mono valent anion showed a relatively small decrease, even showed a slight increase at lower salt concentrations in the case of polyNVIBA. Salt with I- or SCN- showed evident increases in LCSP up to 1 M and was maintained higher than the control even at 2 M. We discuss the interactions of the amide group in the side chains of polymers and water and their perturbation by ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050276
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 48
    Electronic Resource
    Electronic Resource
    Viscosity and Excess Volume at High Pressures in Associative Binaries (1998)
    Springer
    International journal of thermophysics 19 (1998), S. 161-189 
    Details
    ISSN: 1572-9567
    Keywords: excess activation energy of flow ; excess volume ; high pressure ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dynamic viscosity η and the density ρ of three pure substances (water, 2-propanol, diacetone alcohol) and the three associated binaries were measured versus temperature T (303.15, 323.15, and 343.15 K) and pressure P. For the binary systems the mole fractions x of each component were, successively, 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1. For viscosity the experimental results (P≤100 MPa) represent a total of 540 data points: 54 for the pure substances and 486 for the binary mixtures (x≠0 and x≠1). For density the experimental results (P≤70 MPa) represent 1260 values: 126 for the pure substances and 1134 for the binary mixtures (x≠0 and x≠1). The mixtures with water are highly associative and the curves for the variation of η with composition exhibit a maxima. The variations of the excess activation energy of viscous flow ΔG E are discussed. Moreover, the measurements of ρ are sufficiently accurate to determine the excess volumes V E versus pressure, temperature, and composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021455203728
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 49
    Electronic Resource
    Electronic Resource
    Viscosity and Density at High Pressures in an Associative Ternary (1998)
    Springer
    International journal of thermophysics 19 (1998), S. 1325-1341 
    Details
    ISSN: 1572-9567
    Keywords: density ; excess activation energy of viscous flow ; high pressure ; ternary mixture ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dynamic viscosity η and the density ρ of the associative ternary mixture water+diacetone alcohol+2-propanol have been measured as a function of temperature T (303.15, 323.15, and 343.15 K) and pressure P (≤100 MPa). The experimental results correspond to 698 values of η and ρ. With reference to the 54 values previously published on pure substances and 486 values for three corresponding binaries, the system is globally described by 1188 experimental values for various values of P, T and composition. The results for η are discussed in terms of excess activation energy of viscous flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021975300772
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 50
    Electronic Resource
    Electronic Resource
    Viscosity of Alcohol–Ethene Mixtures at Pressures up to 195 MPa (1998)
    Springer
    International journal of thermophysics 19 (1998), S. 43-69 
    Details
    ISSN: 1572-9567
    Keywords: alcohols ; density ; ethene ; high pressure ; hydrogen bond ; mixtures ; vinyl acetate ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Viscosities of several alcohol–ethene and vinyl acetate–ethene mixtures were measured with a rolling-ball viscometer. The viscosity measurements were performed at temperatures from 298 to 413 K and pressures up to 195 MPa with an estimated uncertainty of ±2%. The appearance of hydrogen bonds forming alcohol associates has a notable effect on the viscosity of alcohol–ethene mixtures above an alcohol mole fraction of about 0.2. This could be noticed from the deviation of the viscosity from the Arrhenius law, which occurs when alcohol associates are formed. An effect of pressure on the association of alcohol molecules through hydrogen bonding was not observable from the viscosity data. A new method for the description of the temperature- and pressure-dependent parameters in the McAllister and Dizechi models is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021494917841
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 51
    Electronic Resource
    Electronic Resource
    The dual role of mRNA half-lives in the expression of the yeast ALG7 gene (1997)
    Springer
    Molecular and cellular biochemistry 169 (1997), S. 95-106 
    Details
    ISSN: 1573-4919
    Keywords: Saccharomyces cerevisiae ; N-glycosylation ; dolichol pathway ; ALG7 ; post-transcriptional regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The yeast ALG7 gene functions by initiating the synthesis of the dolichol-linked oligosaccharide precursor and plays an important role in the control of protein N-glycosylation. The levels of ALG7 multiple transcripts are modulated by the physiological status of the cell and environmental cues, and deregulation of their abundance is deleterious to several cellular functions. Since ALG7 mRNAs are unstable, we investigated the role of these transcripts' half-lives in determining their steady-state levels. Using a temperature-sensitive RNA polymerase II mutant, we demonstrate that increased stability was the primary determinant of higher ALG7 mRNA abundance in response to glucose limitation or treatment with tunicamycin. In contrast, at the G1/G0 transition point, changes in the decay rates were inversely related to ALG7 transcript accumulation: the decreased abundance of ALG7 mRNAs following exit from the mitotic cycle was associated with lengthening of the decay rates, while their increased accumulation after growth stimulation correlated with decreased stability. This suggests that, depending on the circumstance, mRNA half-lives can either directly determine the level of ALG7 transcript accumulation or oppose regulatory changes at other control levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006803004151
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 52
    Electronic Resource
    Electronic Resource
    Site-Directed Mutagenesis in Basic Amino Acid Residues of Saccharomyces cerevisiae Phosphoenolpyruvate Carboxykinase (1997)
    Springer
    The protein journal 16 (1997), S. 233-236 
    Details
    ISSN: 1573-4943
    Keywords: Saccharomyces cerevisiae ; phosphoenolpyruvate carboxykinase ; pyridoxal phosphate ; site-directed mutagenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Mutant Arg76Gln and Lys290Gln Saccharomyces cerevisiae phosphoenolpyruvate carboxykinases have been prepared and analyzed. No alteration in the apparent kinetic constants were detected for the Arg76Gln mutant enzyme, while the Lys290Gln mutant showed a 12-fold decrease in V max/K mADP. These results indicate that Arg76 is not involved in CO2 binding, but support the hypothesis that the binding of this substrate induces a conformational change that protects the region around Arg76 from trypsin action [Herrera et al. (1993) J. Protein Chem. 12, 413–418]. These findings also indicate that Lys290, a highly reactive residue against pyrydoxal phosphate [Bazaes et al. (1995), FEBS Lett. 360, 207–210], does not perform an essential function for the enzyme activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026335010370
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 53
    Electronic Resource
    Electronic Resource
    Cellulose depolymerization to glucose and other water soluble polysaccharides by shear deformation and high pressure treatment (1997)
    Springer
    Glycoconjugate journal 14 (1997), S. 669-676 
    Details
    ISSN: 1573-4986
    Keywords: glucose ; polysaccharides ; wood ; cellulose ; lignin ; high pressure ; shear deformation ; depolymerization ; solubility ; fermentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The simultaneous action of shear deformation and high pressure (SDHP) creates changes in the structure of wood and its main components (cellulose, hemicelluloses, lignin). The formation of water and alkali soluble polysaccharides under SDHP action, proceeds in seconds in the solid state, without the use of any reagents and solvents. Therefore, SDHP seems to be a technologically safe method and friendly to the environment. The amorphization of cellulose crystallites and depolymerization of cellulose chains were observed under a wide range of pressures (1–6 GPa), both for cellulose samples and the cellulose part of wood. Similar depolymerization occurs in the hemicellulose part of wood. The decomposition of polysaccharides under SDHP causes the formation of the water soluble part, whose content increases with pressure and the applied shear deformation. A maximum solubility of 40% and 55% was registered at 6 GPa following treatment of cellulose and birch wood samples. A higher output in the case of wood can be explained by a specific role of lignin under SDHP, which acts as a ‘grinding stone’ during cellulose and hemicelluloses destruction. As shown by high-performance size exclusion chromatography, the water soluble fraction obtained from cellulose contained glucose (2.6%), cellobiose (9.6%), cellotriose (16.6%) and other higher water soluble oligomers (71%). Almost complete dissolution (98%) of the treated cellulose sample can be achieved by extraction with 10% NaOH solution. The SDHP treated birch wood was subjected to submerged fermentation (with Trichoderma viride), and a 13% output of proteins was obtained. In this case, the water soluble part played the role of the so called ‘start sugars’. Abbreviations:ASF, alkali soluble fraction; DP, degree of polymerization; EC, energy consumption; HP, high pressure; LMWS, low molecular weight sugars; MC, moisture content; MCC, microcrystalline cellulose; SD, shear deformation, SDHP, shear deformation under high pressure; SS, shear strength; WSF, water soluble fraction
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018557114493
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 54
    Electronic Resource
    Electronic Resource
    Pressure-induced phase transition from disordered microemulsion to lamellar structure in a water/AOT/n-decane system (1997)
    Springer
    Colloid & polymer science 106 (1997), S. 86-90 
    Details
    ISSN: 1435-1536
    Keywords: Neutron scattering ; microemulsion ; lamellar structure ; first-order phase transition ; high pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Pressure effect on the structure of a 3-component micro-emulsion AOT/water/n-decane was investigated by means of small-angle neutron scattering. The measured pressure range was from 0.1 (1 atm) to 83.5 MPa. The present sample was at the composition of the molar ratio of [water]/[AOT]=40.8 and the volume fraction of both water and AOT against the whole volume 0.6. A phase transition from disordered microemulsion to ordered lamellar structure was observed at about 50 MPa through a coexisting region. The pressure dependence of the repeat distance and the correlation length in both high- and low-pressure phases was calculated from the scattering profiles by fitting to Teubner and Strey's formula and/or a single Gaussian. The low-pressure phase became more disordered with increasing pressure and then the phase transition to the ordered phase occurred.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189498
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 55
    Electronic Resource
    Electronic Resource
    Phase Diagram of the Xe–H2O System up to 15 kbar (1997)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 28 (1997), S. 271-285 
    Details
    ISSN: 1573-1111
    Keywords: Xenon hydrate ; high pressure ; phase diagram ; clathrate hydrate ; gas hydrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The phase equilibria in the Xe–H2O system have been studied by the DTA technique under hydrostatic pressures up to 15 000 bar in a temperature range from -25 °C to 100 °C. We have shown that the cubic structure I xenon hydrate forming at ambient pressure does not undergo any phase transitions under the conditions studied. The temperature of its decomposition into water solution and gas (fluid) increases from 27 °C at 25 bar to 78.2 °C at 6150 bar. At higher pressures the hydrate decomposes into water solution and solid xenon. In the temperature range from 6800 to 9500 bar the decomposition temperature (79.0–79.5 °C) is practically independent of pressure, while further pressure increase results in a slow decrease to 67 °C at 15 000 bar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007911123739
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 56
    Electronic Resource
    Electronic Resource
    UV-Vis spectroscopic study on effects of pressure for adsorption ofp-nitrotoluene at liquid-solid interface (1996)
    Springer
    Adsorption 3 (1996), S. 173-180 
    Details
    ISSN: 1572-8757
    Keywords: electronic spectra ; adsorption of liquid ; zeolites ; p-nitrotoluene ; high pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The behavior ofp-nitrotoluene adsorbed at zeolite/n-heptane interface has been investigated by the electronic spectroscopy under pressure up to 300 MPa. The uv-vis absorption bands of adsorbedp-nitrotoluene were deconvoluted into ones for the species adsorbed on the cation sites, and one for that on the pore wall of zeolite. The peak of adsorbed species on the cation site red-shifted by 20–80 nm from the position of the same species in the liquid phase, and their magnitudes of shift depended on the strength of electric field generated by the cation in zeolites. The peak intensities of adsorbed species on the cation site were enhanced but these or the pore wall site were reduced with the increase in pressure, suggesting that a part ofp-nitroluene molecules on the pore wall site desorbed and the adsorption on the cation site was enhanced by compression. The pressure dependence of peak intensity indicated that the behavior of this adsorption system was strongly governed by the solvation structure of the adsorbate in the zeolite pore. In particular, it was found that the adsorption of solvent molecules on the cation site strongly affected the volume change of the adsorption system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01650240
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 57
    Electronic Resource
    Electronic Resource
    Electron paramagnetic resonance studies and effects of vanadium in Saccharomyces cerevisiae (1996)
    Springer
    BioMetals 9 (1996), S. 91-97 
    Details
    ISSN: 1572-8773
    Keywords: EPR ; Saccharomyces cerevisiae ; uptake ; vanadate ; vanadyl
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Vanadium uptake by whole cells and isolated cell walls of the yeast Saccharomyces cerevisiae was studied. When orthovanadate was added to wild-type S. cerevisiae cells growing in rich medium, growth was inhibited as a function of the VO4 3- concentration and the growth was completely arrested at a concentration of 20 mM of VO4 3- in YEPD. Electron paramagnetic resonance (EPR) spectroscopy was used to obtain structural and dynamic information about the cell-associated paramagnetic vanadyl ion. The presence of EPR signals indicated that vanadate was reduced by whole cells to the vanadyl ion. On the contrary, no EPR signals were detected after interaction of vanadate with isolated cell walls. A ‘mobile’ and an ‘immobile’ species associated in cells with small chelates and with macromolecular sites, respectively, were identified. The value of rotational correlation time τ r indicated the relative motional freedom at the macromolecular site. A strongly ‘immobilized’ vanadyl species bound to polar sites mainly through coulombic attractions was detected after interaction of VO2+ ions with isolated cell walls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188096
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 58
    Electronic Resource
    Electronic Resource
    Regulation of intracellular level of Na+, K+ and glycerol in Saccharomyces cerevisiae under osmotic stress (1996)
    Springer
    Molecular and cellular biochemistry 158 (1996), S. 121-124 
    Details
    ISSN: 1573-4919
    Keywords: osmotic stress ; Saccharomyces cerevisiae ; glycerol ; K+/Na+ ions ; osmoregulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The intracellular level of Na+ and K+ of S. cerevisiae strain AB1375 revealed that under KCl as well as sorbitol stress, the cationic level was comparable to the level under no stress conditions. On the other hand, there was a sharp drop in the intracellular K+ content and increase in the Na+ content on addition of NaCl to the medium. However, the total cationic level was close to that under control conditions. In addition to changes in the cationic level, an enhanced production and accumulation of glycerol were also observed under osmotic stress. A regulatory mechanism co-ordinating the intracellular concentration of glycerol as well as Na+, K+ content under osmotic stress conditions has been proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225837
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 59
    Electronic Resource
    Electronic Resource
    Thiol-induced oligomerization of α-lactalbumin at high pressure (1996)
    Springer
    The protein journal 15 (1996), S. 501-509 
    Details
    ISSN: 1573-4943
    Keywords: α-Lactalbumin ; high pressure ; oligomerization ; aggregation ; reducer ; cryotropic gelation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Denaturation and aggregation ofα-lactalbumin at high pressure (up to 10 kbar, 1000 MPa) were studied by means of circular dichroism, gel-permeation chromatography, sodium dodecyl sulfate and gel electrophoresis. It was found that the unfolding ofα-lactalbumin at high pressure is reversible even in basic pH and at a protein concentration as large as 10%. In these conditions only a negligible fraction of the protein is denatured irreversibly and aggregates. The rate of aggregation ofα-lactalbumin at high pressure increases significantly in the presence of low-molecular reducing agents such as cysteine, 2-mercaptoethanol, and dithiothreitol. Maximal yield ofα-lactalbumin oligomerization (over 90%) was achieved in the presence of cysteine at the molar cysteine/protein ratioq=2 and atpH 8.5. Apparent molecular weight of the obtained oligomers was over 500 kDa. It was shown that the size distribution of oligomers can be modulated by varyingpH and reducing agent. The size distribution shifts in the direction of very large, poorly soluble particles whenpH decreases. Maximal content of the insoluble fraction (about 30%) can be reached at pH 5.5 when cysteine (q=2) is used as reducing agent. The oligomers ofα-lactalbumin are stabilized mainly by nonnative interchain disulfide bridges. Circular dichroism measurements point to an additional mechanism of cohesion of polypeptide chains in the oligomers, which is formation of intermolecularβ-sheets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01908531
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 60
    Electronic Resource
    Electronic Resource
    Adsorption deformation of zeolite NaX at high pressures of xenon (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 321-323 
    Details
    ISSN: 1573-9171
    Keywords: adsorption ; zeolite, crystal deformation ; high pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The deformation of pellets of crystalline zeofite NaX upon adsorption of Xe at pressures from 0.001 to 7 MPa and temperatures from 252.5 to 333 K was studied. In the temperature range studied, the relative linear deformation of zeolite crystals is negative in the initial adsorption region. When the adsorption of Xe increases, its value passes through a minimum and then increases sharply taking positive values at high adsorption volume filling of micropores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01433964
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 61
    Electronic Resource
    Electronic Resource
    New type of quinone-quinone complexation in the reaction of 2,5-dichloro-1,4-benzoquinone with morpholine at high pressure (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 469-470 
    Details
    ISSN: 1573-9171
    Keywords: high pressure ; aminoquinones ; molecular complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The complex of tetralcis(morpholino)-1,4-benzoquinone with 2,5-bis(morpholino)-1,4-benzoquinone of 2 : 1 stoichiometry was obtained in 9 % yield in the reaction of 2,5-dichloro-1,4-benzoquinone with morpholine at high pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01433999
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 62
    Electronic Resource
    Electronic Resource
    Normal stress difference in liquid lubricants sheared under high pressure (1996)
    Springer
    Rheologica acta 35 (1996), S. 13-23 
    Details
    ISSN: 1435-1528
    Keywords: Lubricants ; normal stress ; high pressure ; shear bands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Although normal stress differences in liquids have conventionally been associated with polymers, aspects of rheological behavior in lubricated concentrated contacts suggest that normal stress difference may be significant in even low molecular weight liquids sheared under high pressure and high shear stress. A torsional flow rheogoniometer was constructed for use at high (300 MPa) pressure. Four typical liquid lubricants were investigated, including one polymer/mineral oil solution. Shear stress and N 2-N 2 are reported as functions of shear rate. The effect of pressure variation is reported for two liquids. Results are compared with predictive techniques and a molecular dynamics simulation. Simple low molecular weight lubricant base oils can generate measurable and significant normal stress differences when sheared at high shear stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366549
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 63
    Electronic Resource
    Electronic Resource
    The melting parameters of high-temperature nonmetallic nitrides (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 507-513 
    Details
    ISSN: 1572-9567
    Keywords: aluminium ; boron ; high pressure ; high temperature ; melting parameters ; nitrides ; silicon ; thermogram
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ranges of temperatures and pressures for the existence of condensed boron, aluminum, and silicon nonmetallic nitrides in thermodynamic equilibrium with an ambient gas were calculated on the basis of reference data. The melting parameters of the high-temperature nitrides mentioned above were investigated experimentally in the nitrogen pressure range of 5–200 MPa. The 99% purity nitride samples were prepared in the form of 4 x 4-mm plates with a thickness of 1 mm. The surfaces of samples were heated with stationary laser beam and analyzed by X-ray technique. The brightness temperature of nonmetallic nitrides was measured at 0.633-µm wavelength using the optical pyrometry method. The apparent melting temperatures were found from the analysis of heating and cooling thermograms. Based on the available literature data on normal spectral emmissivity, the true melting temperatures of nonmetallic nitrides were estimated as 3370 K for BN, 3025 K for AIN, and 2775 K for Si3N4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01443407
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 64
    Electronic Resource
    Electronic Resource
    Compressibilities of ternary mixtures C1-nC16-CO2 under pressure from ultrasonic measurements of sound speed (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 851-871 
    Details
    ISSN: 1572-9567
    Keywords: compressibility ; equation of state ; high pressure ; speed of sound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Speed of sound measurements have been performed on three mixtures of the ternary system methane + carbon dioxide + normal hexadecane. The systems have been investigated from 12 to 70 MPa in the temperature range from 313 to 393 K. Furthermore, these measurements have allowed the evaluation of the isothermal and the isentropic compressibilities up to 70 MPa from low pressure (〈40-MPa) density data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439193
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 65
    Electronic Resource
    Electronic Resource
    High-temperature, high-pressure thermophysical measurements on liquid zinc (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 987-1000 
    Details
    ISSN: 1572-9567
    Keywords: critical point ; electrical resistivity ; enthalpy ; high pressure ; high temperature ; liquid metals ; zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Wire-shaped zinc samples were resistively volume heated as part of a fast-capacitor discharge circuit. Time-resolved measurements with submicrosecond resolution of the current through the specimen, the voltage drop across it, and the thermal expansion of the specimen as a function of time allow determination of the enthalpy, electrical resistivity, and density at different temperatures up to superheated liquid states of zinc far above the normal boiling point. High static pressures, up to 3800 bar of the ambient medium water, were used. An estimate of the critical pressure for zinc is given by investigations of the stability of the sample with a framing CCD camera, taking pictures of different samples varying the ambient static pressure. The critical volume and the critical temperature are obtained by means of an extrapolation of measured data at different pressures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01441988
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 66
    Electronic Resource
    Electronic Resource
    Silica under very large positive and negative pressures: Molecular dynamics simulations on parallel computers (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 169-178 
    Details
    ISSN: 1572-9567
    Keywords: densified silica ; fast multipole method ; fracture ; high pressure ; intermediate range order ; kinetic roughening ; molecular dynamics ; multiresolution algorithms ; parallel computing ; porous silica ; structural transformations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A highly efficient multiresolution algorithm has been developed to carry out large-scale molecular dynamics (MD) simulations for systems with long-range Coulomb and three-body covalent interactions. The algorithm combines the reduced cell and fast multipole methods and multiple time-step approach. Pressure-induced structural transformation, loss of intermediate range order, and dynamcal correlations in SiO2, glass are investigated with the moleculardynamics method. At twice the normal density, the Si-O bond length increases, the Si O coordination changes from 4 to 6, and the O-Si-O band-angle changes from 109 to 90°. This is a tetrahedral-to-octahedral transformation, which was reported by Meade, Hemley, and Mao. Results for phonon density of states also reveal significant changes at high pressures. The multiresolution MD approach has been used to investigate the structural properties and mechanical failure in microporous silica. Structural correlations are characterized by the fractal dimension, internal surface area, and pore surface-tovolume ratio. Critical behavior at fracture is analyzed in terms of pore percolation, and kinetic roughening of fractured surface is also investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01448219
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 67
    Electronic Resource
    Electronic Resource
    Volumetric properties of mixtures of 1,4-dioxane and water at high pressures (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 441-454 
    Details
    ISSN: 1572-9567
    Keywords: aqueous solutions ; compressibility ; density ; dioxane ; high pressure ; partial molar volume
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Densities of aqueous of 1,4-dioxane have been measured at temperatures from 298 to 348 K and at pressures up to 40 MPa by a vibrating-tube method. Molar volumes obtained with an estimated uncertainty of ±0.2°,% are correlated with pressure by the Tait equation within the experimental uncertainty. Pressure and composition dependences of the excess molar volume, partial molar volume, and isothermal compressibility are determined and they are compared with those of other aqueous solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01443402
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 68
    Electronic Resource
    Electronic Resource
    Halogenated arenes in the Duff reaction at high pressures (1995)
    Springer
    Russian chemical bulletin 44 (1995), S. 310-314 
    Details
    ISSN: 1573-9171
    Keywords: high pressure ; phase transition ; cyclic regime ; relative rate ; Duff reaction ; fluorobenzene ; fluorobenzaldehydes ; N-(fluorophenylmethyl)trifluoroacetamides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reaction of fluorobenzene with urotropine in trifluoroacetic acid (TFAA) at high pressures and temperatures affords predominantly fluorobenzaldehydes andN-(fluorophenylmethyl)trifluoroacetamides. The yields of these products depend considerably on the reaction conditions. The rates of their formation have the maximum values at the momemt of the phase transition (PT) of TFAA. A new efficient cyclic (dynamic) regime is proposed for the synthesis at high pressures. The regime involves periodically occurring PT of the solvent. The change in the relative rate of product formation with the degree of fluorobenzene conversion is wave-like.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00702142
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 69
    Electronic Resource
    Electronic Resource
    Reactions of nucleophilic substitution involving solid organic halogen compounds under shear deformation at high pressure (1995)
    Springer
    Russian chemical bulletin 44 (1995), S. 1050-1055 
    Details
    ISSN: 1573-9171
    Keywords: shear deformation ; high pressure ; halogen derivatives of carboxylic acids ; dihalobenzenes ; alkaline metal halides ; ammonium salts of halogen derivatives of carboxylic acids ; amino acids ; halo-substituted adamantanes ; adamantanol ; nucleophilic substitution reaction ; hydrolysis ; ball mill
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Under conditions of shear deformation and high pressures (SD+HP), reactions of nucleophilic substitution were studied: 1) the replacement of aliphatic halogen atom with alkaline metal halides (halo-substituted aliphatic carboxylic acids, 1-bromoadamantane); 2) the replacement of halogen atom in aromatic nucleus (halobenzoic acids, dihalobenzenes) with halogen of salt; 3) the replacement of aliphatic halogen with hydroxyl (hydrolysis in a solid phase); 4) the replacement of halogen with amino group under deformation of the samples of ammonium α-halocarboxylates to give the corresponding amino acids. It was found that the exchange of the halogen atoms bonded with aliphatic carbon is most intensive in the mixtures of alkaline metal iodides with bromo-substituted acetic and propionic acids: the exchange reaction in these mixtures is observed even during grinding in the mortar. Unlike the liquid phase, under conditions of SD+HP exchange of the halogen atom of the aromatic nucleus with alkaline metal halides, proceeds successfully, and the reactivity of halides increases in the series Na 〈 K 〈 Rb 〈 Cs. Under SD+HP, 1-Br-adamantane reacts with water to form 1-adamantanol. A high reactivity of the water adsorbed by the reagents is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00707051
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 70
    Electronic Resource
    Electronic Resource
    Glycan modification of a thermostable recombinant (1-3,1-4)-β-glucanase secreted fromSaccharomyces cerevisiae is determined by strain and culture conditions (1995)
    Springer
    Glycoconjugate journal 12 (1995), S. 380-390 
    Details
    ISSN: 1573-4986
    Keywords: glycosylation ; Saccharomyces cerevisiae ; heterologous ; glucanase ; thermostability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract High level biosynthesis and secretion of the thermostable hybrid (1-3,1-4)-β-glucanase H(A16-M) has been achieved inSaccharomyces cerevisiae by means of the yeast vacuolar endoprotease B promoter (PRB1p) and theBacillus macerans (1-3,1-4)-β-glucanase signal peptide. The N-glycans present on the yeast-secreted H(A16-M), denoted H(A16-M)-Y, were released by endoglycosidase H, and identified by proton NMR spectroscopy to be a homologous series of Man8-13GlcNAc2, although only traces of Man9GlcNAc2 were found. Therefore, processing of N-glycans on H(A16-M)-Y is similar to that on homologous proteins. Most of the N-glycans (88%) were neutral while the remainder were charged due to phosphorylation. Site-directed mutagenesis of Asn to Gln in two of the N-glycosylation sequons, and subsequent analysis of the N-glycans on the yeast-secreted proteins together with analysis of the N-glycans from the individual sites of H(A16-M)-Y suggest the presence of steric hindrance to glycan modification by the glycans themselves. H(A16-M)-Y produced under control of either the yeast protease B or the yeast 3′-phosphoglycerate kinase promoter, each in two differentSaccharomyces strains revealed a dependence of N-glycan profile on both strain and culture conditions. The extent of O-glycosylation was found to be nine mannose units per H(A16-M)-Y molecule. An attempt to identify the linkage-sites for the O-glycans by amino acid sequencing failed, suggesting non-stoichiometric or heterogeneous O-glycosylation. The possible modes in which N-glycans might contribute to resistance of H(A16-M)-Y to irreversible thermal denaturation are discussed with respect to structural information available for H(A16-M)-Y.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00731341
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 71
    Electronic Resource
    Electronic Resource
    Simulations of polymer crystallization under high pressure (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 811-815 
    Details
    ISSN: 1435-1536
    Keywords: Simulation ; crystallization ; high pressure ; linear growth rate ; nucleation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract High pressure crystallization of polypropylene was studied by means of PVT measurements and computer simulations. The isothermal crystallization behaviour were described by using a model which takes into account the effect of pressure on the temperature dependence of nucleation rate and linear growth rate. The agreement between the simulation and the experiments was seen in the tendency that the crystallization was accelerated by the high pressure. The non-isothermal crystallization behavior was also simulated by applying a generalized Avrami equation. The simulation curves well reproduced the experimental values below relative crystallinity 0.5 and below 100 MPa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658762
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 72
    Electronic Resource
    Electronic Resource
    Beyond KTB - electrical conductivity of the deep continental crust (1995)
    Springer
    Surveys in geophysics 16 (1995), S. 5-36 
    Details
    ISSN: 1573-0956
    Keywords: continental crust ; electrical conductivity ; high pressure ; high temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Great strides have been made in understanding the upper part of the crust by in-situ logging in, and laboratory experiments on core recovered from super-deep bore-holes such as the KTB. These boreholes do not extend into the lower crust, and can contribute little to the elucidation of mechanisms that produce the high electrical conductivities that are commonly observed therein by magneto-telluric (MT) methods. Laboratory studies at simulated lower crustal conditions of temperature, pressure and saturation, on electrolyte saturated rocks thought to have been derived from the lower crust, have not been possible up until now due to their experimental difficulty. It is necessary to subject electrolyte-saturated rock samples to independently controlled confining and pore-fluid pressure, which implies that the rock be sleeved in some impermeable but deformable material, that can withstand the very high temperatures required. Metals are the only materials capable of being used, but these cause great difficulties for cell sealing and conductivity measurement. In this paper we describe recent breakthroughs in experimental work, specifically the development of two new types of sophisticated metal/ceramic seal, and a conductivity measurement technique that enables the measurement of saturated rock conductivity in the presence of a highly conducting metallic sleeve. The advances in experimental technique have enabled us to obtain data on the electrical conductivity of brine saturated basic, acidic and graphite-bearing rocks at lower crustal temperatures and raised pressures. These data have facilitated the comparison of MT derived crustal electrical conductivity profiles with profiles obtained from laboratory experiments for the first time. Initial modelling shows a good agreement between laboratory derived and MT derived profiles only if the mid-crust is composed of amphibolite pervaded by aqueous fluids, and the lower crust is composed of granulite that is saturated with aqueous fluids and/or contains interconnected grain surface films of graphite. The experimental data are consistent with a three layer crust consisting of an aqueous fluid saturated acidic uppermost layer, above an aqueous fluid saturated amphibolite mid-crust, and a granulite lowermost crust, which may or may not be saturated with aqueous fluids, but if not, requires the presence of an additional conduction mechanism such as conduction through thin graphite films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00682710
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 73
    Electronic Resource
    Electronic Resource
    Measurements of the viscosity of new refrigerants in the temperature range 270–340 K at pressures up to 20 MPa (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 133-143 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; refrigerants ; vibrating wire ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A recently modified vibrating-wire instrument was employed to measure the liquid viscosity of a wide selection of new refrigerants under pressure. Calibration of the viscometer with water over the range of measurements confirmed that the estimated uncertainty of the measurements is 0.5%, while the precision is 0.3%. With this instrument, the viscosity of chlorofuorocarbons (CFC's) and alternative refrigerants. R11. R12. R22, R32. R124, R125. 11134a. R 141 b, and R152a, was measured over the temperature range from 270 to 340 K, from just above the saturation pressure up to 211 M Pa. The experimental data, represented by polynomial functions of temperature and pressure, are used in a comparative examination of other recently reported experimental measurements of the viscosity of all these refrigerants. to investigate the uncertainty with which the viscosity is known.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438964
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 74
    Electronic Resource
    Electronic Resource
    High-pressure cylindrical acoustic resonance diffusion measurements of methane in liquid hydrocarbons (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 655-662 
    Details
    ISSN: 1572-9567
    Keywords: acoustic resonance spectroscopy ; diffusion kinetics ; high pressure ; methane ; liquid hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A novel cylindrical acoustic resonance method for the measurement of gas diffusion into liquids at high pressures is described. The measurements were per formed in a vertically oriented cylindrical acoustic resonator containing both the liquid solvent and gaseous diffusant while under high-precision isothermal and isobaric control. Individual resonance modes of the liquid column, the gas column, and the two-phase coupled fluid are resolved in the fast Fourier trans form acoustic-resonance spectrum (FFT-ARS). High-resolution acoustic spectra measured at frequent time intervals reveal the changes which accompany the diffusion fusion of gas into the liquid phase. One change, namely, the growth in length of the liquid column, results in a systematic shift to higher frequencies of axial modes in the gas column. The temporal behavior of this moving boundary, together with quantitative measurement of the flow to the gas column required to sustain the constant pressure, permits determination of the gas-into-liquid diffusion coefficient. Diffusion coefficients were determined from the change in frequency as a function of time of axial resonance modes in the gas-phase virtual cylinder as the surface of the underlying liquid phase advanced due to gas absorption. Measurements of the systems methane/n-octane, methane/n-nonane, and methane/n-decane were performed as a function of temperature at a pressure of 250 psia. Comparisons is made to results obtained elsewhere and by other methods but at the same temperatures and pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438850
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 75
    Electronic Resource
    Electronic Resource
    A new, accurate single-sinker densitometer for temperatures from 233 to 523 K at pressures up to 30 MPa (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 399-411 
    Details
    ISSN: 1572-9567
    Keywords: density ; high pressure ; high temperature ; magnetic suspension balance ; single-sinker densitometer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new apparatus for density measurements of fluids in the entire range from gas to liquid densities is presented. The instrument is a single-sinker buoyancy densitometer designed in a completely new way. The buoyancy force exerted by the sample fluid on an immersed sinker (buoy) is transferred by a new type of magnetic suspension coupling to an analytical balance. In order to reduce drastically the linearity error of the (commercial) balance. a special basic load compensation is applied which also avoids any buoyancy ellèct of the laboratory air on the balance. The new single-sinker densitometer covers a density range from 10 to 200(1 kg - m ' at temperatures from 233 to 523 K and pressures up to 30 MPa. A special compact version of such a single-sinker densitometer can even he used at temperatures from 80 to 523 K at pressures up to 100 MPa. Test measurements on densities of carbon dioxide at 233, 360, and 523 K at pressures up to 30 MPa show that the estimated total uncertainty of ±0.02% to ±0.03% in density is clearly met.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01441906
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 76
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of the generalized Murnaghan equation of state of solids (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 1009-1026 
    Details
    ISSN: 1572-9567
    Keywords: Anderson-Grüneisen ; bulk modulus ; equation of state ; expansivity ; high pressure ; Murnaghan equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the Murnaghan approximation, an isothermal relation between pressure (P) and volume (V) for solids is derived from the assumption that the isothermal bulk modulus (B) is a linear function ofP. This paper presents a thermodynamic analysis of a generalized form of the equation, based on treating all its various parameters [viz., V, B, and (∂B/∂P) T atP=0] as functions of temperature. Extending a previous study, the effect ofT upon (∂B/∂P) T is accounted for by using a dimensionless parameter introduced by us, which is used in formulating general expressions for the volume dependence of various thermophysical quantities,viz., the thermal expansion coefficient (α), the productαB, and the Grüneisen and Anderson-Grüneisen parameters. Some combinations of these parameters are identified, which show a simple dependence uponP. The new expressions are used in analyzing current approximations and the behavior of the solid in the low-compression range. In particular, an expression forα at highP is reported which generalizes the Anderson equation and previous results by us.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02093479
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 77
    Electronic Resource
    Electronic Resource
    Correlation and prediction of dense fluid transport coefficients. VII. Refrigerants (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 761-772 
    Details
    ISSN: 1572-9567
    Keywords: density ; high pressure ; refrigerants ; Tail equation ; thermal conductivity ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A recently developed scheme, based on considerations of hard-sphere theory, is used for the simultaneous correlation of the coefficients of viscosity and thermal conductivity for the refrigerants R11, R12, R22, R32. R124, R125, R134a, R141b, and R152a in excellent agreement with experiment, over extended temperature and pressure ranges. Values for the roughness factors and correlations for the characteristic volume are presented. The overall average absolute deviations of the experimental viscosity and thermal conductivity measurements from those calculated by the correlation are 2.1 and 2.3%, respectively, over a temperature range from 200 to about 10 K below the critical temperature and a pressure range from saturation to about 40 MPa. Since the proposed scheme is based on recent and accurate density values, a Tail-type equation was also employed to correlate successfully the density of the refrigerants. The overall average absolute deviation of the experimental density measurements from those calculated by the correlation is ±0.08%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438861
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 78
    Electronic Resource
    Electronic Resource
    Measurements of the thermal conductivity of liquid R32, R124, R125, and R141b (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 851-865 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; refrigerants ; R32 ; R124 ; R125 ; R141b ; thermal conductivity ; transient hot-wire technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper reports measurements of the thermal conductivity of refrigerants R32, R124, R125, and R141b in the liquid phase. The measurements, covering a temperature range from 253 to 334 K and pressure up to 20 MPa, have been performed in a transient hotwire instrument employing two anodized tantalum wires. The uncertainty of the present thermal-conductivity data is estimated to be ±0.5%. The experimental data have been represented by polynomial functions of temperature and pressure for the purposes of interpolation. A comparison with other recent measurements is also included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02093468
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 79
    Electronic Resource
    Electronic Resource
    Raman investigation of the supercritical mixture He-H2 (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 965-971 
    Details
    ISSN: 1572-9567
    Keywords: concentration fluctuations ; critical line broadening ; high pressure ; hydrogen-helium ; mixtures ; Raman spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigated the vibrational Raman spectrum of H2 in the binary mixture He-H2. The Q1-line was measured between 150 and 350 K for two isobars in the gigapascal region in a mixture of critical composition. The results indicate a broadening of the spectrum due to critical concentration fluctuations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02093476
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 80
    Electronic Resource
    Electronic Resource
    Inter- and intradiffusion in liquid mixtures of methane andn-decane (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 1213-1224 
    Details
    ISSN: 1572-9567
    Keywords: alkanes ; diffusion ; high pressure ; mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The interdiffusion coefficient,D 12, has been measured by Mach-Zehnder interferometry for liquid mixtures of methane andn-decane at 303 K. The mole fraction of methane was from 0.11 to 0.96 and the pressure was from 30 to 60 MPa. This includes measurements in the critical region, the critical locus being approached from supercritical pressures to within 0.4 MPa. The accuracy inD 12 is estimated to be from 3 to 10%, depending on the composition. Our data are compared with the Sigmund correlation, which is widely used to estimate diffusion coefficients in hydrocarbons at high pressures. The deviation between estimate and measurement is one order of magnitude for some of the states. We have also compared with a more recent correlation used by Erkey, but this one is not found to be applicable to the compositions studied in the present work. Our data were related to recently measured intradiffusion coefficients,D 1 andD 2, at the same state points. On this basis, we have evaluated different mixing rules for obtaining the interdiffusion coefficient from intradiffusion coefficients, both close to and away from the critical region. It is found that the so-called Darken and Adamson relations have the right qualitative behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02081289
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 81
    Electronic Resource
    Electronic Resource
    Determination of the viscosity of various hydrocarbons and mixtures of hydrocarbons versus temperature and pressure (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 1309-1334 
    Details
    ISSN: 1572-9567
    Keywords: density ; high pressure ; hydrocarbons ; mixtures ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dynamic viscosityη and densityρ of 10 pure substances and three binary systems were measured as a function of temperatureT (298.15, 313.15, 333.15, 353.15, and 363.15 K.) and pressureP (⩽100 MPa). The pure substances were toluene,p-xylene,m-xylene,o-xylene, methylcyclohexane, methylnaphthalene, decahydronaphthalene, phenyldodecane, heptamethylnonane, and tetramethylpentadecane (pristane). The three binaries were toluene + tetramethylpentadecane, toluene + methylnaphthalene, and toluene + heptamethylnonane, for molar fractionsx of toluene ranging between 0 and 1. The three binaries are highly “contrasted” systems, i.e., systems in which the viscosities of the pure components are very different for eachP, T pair. In all, 547 experimental determinations were carried out (279 experimental data for viscosity of the pure substances and 268 data concerning the mixtures: x⊋0 and 1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02083543
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 82
    Electronic Resource
    Electronic Resource
    Broadening of the vibrational linewidth in a mixture due to critical concentration fluctuations (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 585-598 
    Details
    ISSN: 1572-9567
    Keywords: concentration fluctuations ; critical broadening ; high pressure ; line shape ; line shift ; local composition ; mixtures ; nitrogen-helium ; Raman spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Vibrational Raman spectroscopy is a very usful technique for studying the dynamical behavior of a system, in particular in the critical region. In a mixture, composition fluctuations play an important role and on the basis of the results for pure substances one would expect an increase of the linewidth in approaching the critical point. However, in previous experiments such an effect was not detected. The reasons for this failure will be discussed. Recently, we have observed a considerable broadening of the linewidth in approaching the critical point in the system helium-nitrogen under high pressure. However, it is well-known that broadening may occur through various other mechanisms such as changes in density, composition fluctuations far from the critical point, aggregation, etc. On the basis of the helium-nitrogen data the pitfalls in the experimental determination of critical broadening are discussed. The data analysis takes into account the contribution of noncritical effects. Consequences are drawn for the interpretation of spectroscopic data in terms of concentration of species in supercritical solvents. Moreover, we discuss the possibility of a difference between the local composition and the bulk composition and demonstrate from our line shift data that this is not a critical effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438844
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 83
    Electronic Resource
    Electronic Resource
    Monte Carlo calculations on the beta-delta phase transition in nitrogen with a generalized free energy method (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 957-963 
    Details
    ISSN: 1572-9567
    Keywords: Gibbs free energy ; high pressure ; Monte Carlo ; nitrogen ; phase transition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Monte Carlo simulations that utilize an (N, P, T) ensemble with periodic deformable boundary conditions cannot describe phase transitions properly when a large potential barrier is involved. An alternative method is to calculate the Gibbs free energy difference between phases; the transition occurs when the difference is equal to zero. The Gibbs free-energy difference can be calculated using a generalized free-energy method. This method is used to determine theβ-δ phase transition of solid nitrogen at room temperature. The Gibbs freeenergy difference between theβ and theδ phase was obtained at 4.0 GPa. The difference at other pressures could be determined with the equation of state. The transition pressure was found at about 6.2 GPa, 1.3 GPa above the experimental pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02093475
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 84
    Electronic Resource
    Electronic Resource
    The viscosity of liquid carbon dioxide (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 145-153 
    Details
    ISSN: 1572-9567
    Keywords: carbon dioxide ; high pressure ; low temperature ; liquid ; viscosity coellicient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The viscosity coellicient of carbon dioxide in the liquid phase has been measured by means of a vibrating-wire viscometer at temperatures of 220, 230, 240, 2411, 260, and 380 K. The measurements extended beyond both phase transition lines into the coexistence region (superheated liquid) and into the solid range (undercooled liquid). At 3811 K. the measurements extended only to 3511 MPa since no density data are available for high pressures. The accuracy of the measurements is estimated to be I % The agreement with the data of Ulybin and Makarushkin is rather good, but our values are in general a few percent lower than those of Diller and Ball. The results show, for the most part, a linear pressure dependence for the various isotherms, with a common intersection with the negative pressure axis of 113.7 MPa. The fluidity, the reciprocal of the viscosity, shows a linear dependence of the molar volume in adjacent density ranges. After reduction of the molar volume with the volumes of close packing, two sets of linear functions result, with common intersections of the axis forV/V 0=1.31 andV/V 0=1.40.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438965
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 85
    Electronic Resource
    Electronic Resource
    The viscosity of liquid toluene at elevated pressures (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 877-882 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; toluene ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper reports new measurements on the viscosity of toluene at pressures up to 500 MPa at 299 K and pressures up to 435 MPa at 323 K. The results are in close agreement with recent viscosity measurements from a vibrating-wire viscometer at pressures up to 250 MPa but confirm earlier measurements from a falling-body viscometer which show that the recently recommended polynomial expression for the representation of the pressure dependence of the viscosity of toluene up to 250 MPa underestimates the viscosity if applied at 500 MPa by about 30%. Modification of this polynomial expression by inclusion of one additional term is found to represent the data satisfactorily over the whole pressure range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02093470
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 86
    Electronic Resource
    Electronic Resource
    Haloarenes in the Duff reaction under high pressures (1995)
    Springer
    Russian chemical bulletin 44 (1995), S. 2127-2130 
    Details
    ISSN: 1573-9171
    Keywords: haloarenes ; Duff reaction ; high pressure ; haloarenecarbaldehydes ; N-(haloarylmethy)trifluoroacetamides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Reactions of haloarenes with urotropine in CF3COOH at elevated temperatures and high pressures give the corresponding aromatic aldehydes and/orN-(haloarylmethyl)trifluoroacetamides. The yeilds of the products and their ratio depend on electronic properties of substituents in the aromatic ring. The reaction carried out in a mixture of CF3COOH and (CF3CO)2O affords only amides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696718
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 87
    Electronic Resource
    Electronic Resource
    Cotrimerization of mono- and dinitriles of perfluorocarboxylic acids under high pressures (1995)
    Springer
    Russian chemical bulletin 44 (1995), S. 1745-1747 
    Details
    ISSN: 1573-9171
    Keywords: nitriles of perfluorocarboxylic acids, cotrimerization ; perfluoropolyethers ; stabilizers of thermal destruction ; high pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Cotrimerization of mono- and dinitriles of perfluorocarboxylic acids under high pressures affords oligoperfluoroalkylenetriazines. These oligomers are highly efficient stabilizers of thermooxidative destruction of perfluoropolyethers, when they are contacting with metals at elevated temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01151303
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 88
    Electronic Resource
    Electronic Resource
    Pressure tuning spectroscopy of the metal-metal quadruple bond (1994)
    Springer
    Journal of cluster science 5 (1994), S. 145-155 
    Details
    ISSN: 1572-8862
    Keywords: Rhenium ; molybdenum ; dimetal complexes ; δ to δ* transition ; high pressure ; solid state ; optical spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The results obtained from the application of high pressure in optical absorption studies of compounds with metal-metal quadruple bonds are reviewed. The different degrees of balance between intermolecular and intramolecular effects of compression in different cases are highlighted. A consistent effect observed for [Re2Cl8]2−, [Mo2Cl8]4− , and related compounds is a continuous shift to Iower energy (red) in the δ to δ* excitation with increasing pressure. This observation is interpreted in terms of significant van der Waals interactions between the molecular chromophore and its surroundings, leading to relative stabilization of the more polarizable excited state. Changes in the intensity of the δ to δ* peak are not correlated with the changes in position. The intensity changes become consistent only at relatively high pressures, and this falloff is attributed largely to compression and deformation of the cell gasket. In certain cases, such as [Re2 I 8]2− and Re2(piv)4X2, piv = pivalate, X= CI, Br, rearrangement to a new species is observed upon the application of high pressure. These rearrangements are all reversible upon pressure release, but they involve different degrees of interaction between adjacent molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01165496
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 89
    Electronic Resource
    Electronic Resource
    Measurements of excess enthalpies at high temperature and pressure using a new type of mixing unit (1994)
    Springer
    Journal of solution chemistry 23 (1994), S. 1161-1182 
    Details
    ISSN: 1572-8927
    Keywords: Heat of mixing ; excess enthalpy ; flow calorimetry ; high temperature ; high pressure ; ethanol ; water ; carbon dioxide ; toluene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A flow mixing unit (calorimetric cell and auxiliary devices) has been designed for measuring the enthalpy of mixing or reaction of two fluids (gas+liquid or liquid+liquid). The indicator of the heat effect is a differential heat flux calorimeter, SETARAM C-80, allowing measurements at temperatures up to 300°C. The mixing cell is made of a stainless-steel capillary (o.d 1.6 mm, length 2.4m) which is coiled in a cylindrical form and tightly fitted in the thermopile well of the calorimeter. The fluids are delivered from the high pressure piston pumps and circulated through the system at controlled flow rates ranging from 100 to 1500 μL-min−1. The tests were carried out at pressures up to 20 MPa. Special care was taken to allow good thermostatting of fluids entering the mixing cell. Check measurements were made with one liquid-liquid system (C2H5OH+H2O) and one gas-liquid system (CO2+C6H5CH3); our enthalpies of mixing agreed with the literature values in most cases to 2%. For the system ethanol+water the experiments have been also performed at temperature of 250°C and pressures of 15 and 20 MPa. The endothermal mixing effect was higher than expected indicating an increase in the excess heat capacity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00974028
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 90
    Electronic Resource
    Electronic Resource
    Adaptation of a Saccharomyces cerevisiae strain to high copper concentrations (1994)
    Springer
    BioMetals 7 (1994), S. 221-226 
    Details
    ISSN: 1572-8773
    Keywords: catalase ; copper resistance ; pH-dependent growth ; Saccharomyces cerevisiae ; superoxide dismutase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A strain of Saccharomyces cerevisiae has been adapted to increasing concentrations of copper at two different pH values. The growth curve at pH 5.5 is characterized by a time generation increasing with the amount of added copper. A significant decrease of cell volume as compared with the control is also observed. At pH 3 the cells grow faster than at pH 5.5 and resist higher copper concentrations (3.8 against 1.2 mm). Experimental evidence indicates that, after copper treatment, the metal is not bound to the cell wall, but is localized intracellularly. A significant precipitation of copper salts in the medium was observed only at pH 5.5. Increased levels of superoxide dismutase (SOD) activity were observed in copper-treated cells and which persisted after 20 subsequent inocula in a medium without added metal. On the contrary, catalase activity was not stimulated by copper treatment and, hence, not correlated with SOD levels. The mechanism of copper resistance, therefore, probably involves a persistent induction of SOD, but not of catalase, and it is strongly pH-dependent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149552
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 91
    Electronic Resource
    Electronic Resource
    High oxygen pressure synthesis of new copper oxide superconductors (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 45-48 
    Details
    ISSN: 1572-9605
    Keywords: La2CuO4 ; high pressure ; La-Ca-Cu-O ; Y-Sr-La-Cu-O ; oxygen pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The unique coordination of the copper ions in +1, +2, and +3 oxidation states, which are stable in a range of oxygen partial pressure. 10−6〈P(O2)〈 103 atm, makes possible the formation of a wide variety of distinct structures. By controlling the oxygen pressure during the synthesis and annealing, the distribution of metal and oxygen ions can be modified on an atomic scale to optimize the structural and electronic properties. We present several examples of compounds for which the critical structural elements for superconductivity, i.e., the perfectly ordered CuO2 planes, have been obtained and doped with holes by means of high oxygen pressure,P(O2)〉1 atm. These materials, La2CuO4+δ , La2−x Ca x CuO4, and YSr2−x La x Cu3O7+δ , offer a unique opportunity to study the relationship between superconductivity and structural, magnetic, and chemical properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730366
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 92
    Electronic Resource
    Electronic Resource
    The phase diagram of the water-hydrogen system in the crystallization field of solid solutions based on ices Ih and II at high pressures (1994)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 20 (1994), S. 115-121 
    Details
    ISSN: 1573-1111
    Keywords: Hydrogen-water solid solutions ; phase diagram ; stoichiometry of clathrates ; high pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The decomposition curves of the solid solutions based on ices Ih (α-solutions) and II (β-solutions) in the water-hydrogen system were studied by the DTA technique at pressures up to 7 kbar. The α-solution is destabilized by pressure but to a lesser degree than ice Ih and is stable up to 2.3 kbar. Theβ-solution is stabilized by pressure and at 7 kbar decomposes at about 20°C. TheP, T-phase diagram of the water-hydrogen system in the crystallization range is constructed on the basis of reference [1] and our data. All possible types of stoichiometric interrelationships in the guest —host system are demonstrated by the example of the water-hydrogen system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00709335
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 93
    Electronic Resource
    Electronic Resource
    The pressure-induced superconductivity of iodine (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 921-924 
    Details
    ISSN: 1572-9605
    Keywords: Iodine ; superconductivity ; high pressure ; low temperature ; monatomic phase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The superconductivity of metallic iodine is observed at temperatures below 1.2 K under pressures above 28 GPa by magnetization and electrical resistance measurements. The pressure dependence of the superconducting transition temperature is studied up to 74 GPa. This is the first observation of the superconductivity of the molecular-dissociated monatomic metal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00732272
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 94
    Electronic Resource
    Electronic Resource
    Effect of pressure onT c in La2- x Ba x CuO4 withx=0.125 (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 819-821 
    Details
    ISSN: 1572-9605
    Keywords: Oxide superconductor ; high pressure ; phase transition ; pressure effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The superconducting transition temperature,T c , of La2−x Ba x CuO4 has been measured under high pressure up to 8 GPa.T c is found to change drastically at the pressure where the structural phase transition takes place. This finding clearly indicates that there exists an intimate relation between the crystal structure and superconductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320876
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 95
    Electronic Resource
    Electronic Resource
    Measurements of the viscosity of alcohols in the temperature range 290–340 K at pressures up to 30 MPa (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 95-107 
    Details
    ISSN: 1572-9567
    Keywords: 1-butanol ; ethanol ; high pressure ; methanol ; 1-propanol ; viscosity ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New measurements of the viscosity of methanol, ethanol, 1-propanol, and 1-butanol are presented. The measurements were performed in a vibrating-wire instrument and cover a temperature range of 290–340 K and pressures up to 30 MPa. The overall uncertainty in the reported data, confirmed by the measurement of the viscosity of water, is ±0.5 %. The high-pressure experimental results were correlated by a Tait-like equation. It was found that the isothermal viscosity data were satisfactorily correlated by such an equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439248
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 96
    Electronic Resource
    Electronic Resource
    An improved representation forn-alkane liquid densities (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 155-164 
    Details
    ISSN: 1572-9567
    Keywords: n-alkanes ; density ; high pressure ; Tait equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New experimental density data have been used to improve a recently published correlation ofn-alkane densities, based on the Tait equation. The new correlation covers then-alkanes from methane ton-hexadecane in an extended pressure range of up to 500 MPa in some cases. The overall average deviation of the experimental measurements of the density from those calculated by the correlation is ±0.10%. A simple extension to n-alkane mixtures gives a satisfactory prediction of the density compared with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439252
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 97
    Electronic Resource
    Electronic Resource
    Volumetric properties of mixtures of fluoroalcohols and water at high pressures (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 245-259 
    Details
    ISSN: 1572-9567
    Keywords: aqueous solutions ; compressibility ; density ; nuoroalcohols ; high pressure ; hydrocarbon alcohols ; Raman spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Densities of aqueous solutions of 2,2,2-trifluoroethanol, 2,2,3,3-tetranuoropropanol, and 2,2,3,3,3-pentanuoropropanol have been measured with a vibrating-tube densitometer. Measurements were performed at temperatures of 298 and 323 K and at pressures up to 80 MPa with an estimated uncertainty of ±0.2 %. Molar volumes obtained for these mixtures are correlated with pressure by the Tait equation within the experimental uncertainty. Excess molar volume, isothermal compressibility, and partial molar volume of these mixtures are determined in terms of this correlation equation and compared with those of the aqueous solutions of hydrocarbon alcohols. Composition dependence of partial molar volume is discussed in comparison with that of Raman spectroscopic data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01441585
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 98
    Electronic Resource
    Electronic Resource
    A vibrating-wire densimeter for liquids at high pressures: The density of 2,2,4-trimethylpentane from 298.15 to 348.15 K and up to 100 MPa (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 229-243 
    Details
    ISSN: 1572-9567
    Keywords: density ; high pressure ; isooctane ; 2,2,4-trimethylpentane ; vibrating-wire densimeter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new apparatus for the measurement of liquid densities at high pressures is presented. The instrument is a development of a vibrating-wire densimeter described earlier and uses the buoyancy force exerted by the sample fluid on an immersed buoy to alter the tension of a wire from which it is suspended. The tension of the wire is related to its resonant frequency under steady-state transverse vibrations through a rigorous theoretical model which includes a complete analysis of the hydrodynamic effect of the fluid surrounding the wire. The present instrument uses a new design for the measuring cell with the purpose of relieving the degeneracy of perpendicular oscillation modes of the vibrating wire. The modifications lead to a significant increase in the precision of the results. Tests performed on the new apparatus and the operating procedure used, which requires the determination of one cell parameter from one density datum at atmospheric pressure, are described. New results for the density of liquid 2,2,4-trimethylpentane at temperatures from 298.15 to 348.15 K and pressures up to 100 MPa are presented. The data obtained have a precision of ±0.05% at a 2a level and an estimated accuracy of approximately ±0.1%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01441584
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 99
    Electronic Resource
    Electronic Resource
    Measurements of the viscosity of liquid R22, R124, and R125 in the temperature range 273–333 K at pressures up to 17 MPa (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 779-790 
    Details
    ISSN: 1572-9567
    Keywords: high pressure ; liquid ; refrigerants ; R22 ; R124 ; R125 ; vibrating-wire ; technique ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Viscosity masurements of refrigerants R22, R124, and R125 in the liquid phase have been performed in the temperature range 273–333 K and at pressures up to about 17 MPa. A vibrating-wire instrument has been employed. The overall uncertainty of the experimental values is estimated to be ±0.5%. The experimental data have been represented by polynomial functions of temperature and pressure for the purposes of interpolation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01447094
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 100
    Electronic Resource
    Electronic Resource
    Molar heat capacity at constant volume for air from 67 to 300 K at pressures to 35 MPa (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 849-861 
    Details
    ISSN: 1572-9567
    Keywords: air ; calorimeter ; heat capacity ; high pressure ; isochoric
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the molar heat capacity at constant volumeC v for air were conducted with an adiabatic calorimeter. Temperatures ranged from 67 to 300 K, and pressures ranged up to 35 MPa. Measurements were conducted at 17 densities which ranged from gas to highly compressed liquid states. In total, 227C v values were obtained. The air sample was prepared gravimetrically from research purity gases resulting in a mole fraction composition of 0.78112 N2 + 0.20966 O2 + 0.00922 Ar. The primary sources of uncertainty are the estimated temperature rise and the estimated quantity of substance in the calorimeter. Overall, the uncertainty (± 2σ) of theC v values is estimated to be less than ± 2% for the gas and ±0.5% for the liquid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01447098
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...