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  • calorimetry  (19)
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  • 2000-2004  (19)
  • Chemistry and Pharmacology  (19)
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  • Articles  (19)
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  • Springer  (19)
  • Frontiers
  • MDPI Publishing
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  • 1
    ISSN: 1572-8757
    Keywords: sorption heats ; calorimetry ; isosteric technique ; zeolites ; gases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Experimental measurements of heats of adsorption published in the literature are often in disagreement; differences of 10–20% are common. The three most widely used experimental methods are: (1) differentiation of adsorption isotherms at constant loading; (2) measurement of adsorption isosteres; (3) calorimetry. Results from these methods were compared for the systems nitrogen on CaA, oxygen on CaA, and carbon dioxide on NaX. Although the same materials and similar degassing procedures were used for all experiments, calorimetric heats are about 2 kJ/mol higher than the heats from isoteric measurements. Additional experiments are needed to bring these methods into exact agreement.
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  • 2
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    Springer
    Journal of thermal analysis and calorimetry 59 (2000), S. 351-358 
    ISSN: 1572-8943
    Keywords: calorimetry ; integrated circuit ; polymer ; portable
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Polymer characterization has largely helped in the development of thermal analyzers and calorimeters, based mainly on the thermocouple technology, or more recently the semiconductor technology. With the use of an integrated silicon thermopile as a detector, a new thermal technique is appearing, to give more possibilities of investigations in the field of polymeric materials. Combining high sensitivity and use of small amount of sample, the originality of the new design comes from its low power consumption, giving rise to a portable version of the instrument. With such a concept, the thermal analysis technique is carried on the industrial site, to perform online measurements. Melting and crystallization, glass transition, control of reticulation are a promising field of applications for the characterization of polymeric materials on industrial sites.
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  • 3
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    Journal of thermal analysis and calorimetry 59 (2000), S. 547-557 
    ISSN: 1572-8943
    Keywords: calorimetry ; hyaluronan ; polysaccharides ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The freezing and melting of water in semi-dilute (0.5–3.0%) solutions of the polysaccharide hyaluronanhave been investigated by modulated differential scanning calorimetry. High molecular weight hyaluronan inhibited nucleation of ice and significantly depressed thefreezing temperature in a dynamic scan conducted at −3.0°C min−1. Low molecular weight hyaluronan had a weaker and more variable effect on nucleation. Theeffects on nucleation, especially by the high molecular weight hyaluronan, are attributed tothe influence of a hyaluronan network on the formation of critical ice nuclei. Both high and low molecular weight hyaluronan reduced the melting temperature of ice by 0.4–1.1°C, depending on concentration. The enthalpy change associated with this transitionwas significantly reduced. If all of the enthalpy difference is attributed to the presence of non-freezing water, approximately 3.65 g water/g hyaluronan would be non-freezing. This result appears incompatible with published studies on hyaluronan samples of low water content. An alternative hypothesis and quantitative approach to analysis of the data are suggested. The data are interpreted in terms of a small amount of non-freezing water, and amuch larger boundary layer of water surrounding hyaluronan chains, which has slightly altered thermodynamic properties relative to those of bulk water. The boundary layer water behaves similarly to water trapped in small pores in solid materials and hydrogels.
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  • 4
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    Springer
    Journal of thermal analysis and calorimetry 61 (2000), S. 885-888 
    ISSN: 1572-8943
    Keywords: calorimetry ; enthalpies of formation ; rare earth ; tellurites ; thermodynamic data ; X-ray analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract By using a DSK of the French firm Seteram, the standard enthalpies of formation of 5 tellurites and 5 tetratellurites of the rare earths Gd, Tb, Dy, Tm and Yb were determined for the first time. Three parallel determinations for each sample were compared. The results are very similar, which is an indication of the great reliability of the method used and the correctness of the data obtained.
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  • 5
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    Journal of thermal analysis and calorimetry 62 (2000), S. 111-122 
    ISSN: 1572-8943
    Keywords: calorimetry ; kinetic model ; PfMAP ; transition state
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Heat denaturation of methionine aminopeptidase from a hyperthermophile Pyrococcus furiosus (PfMAP) was studied by differential scanning calorimetry at acid pH. Analysis of the calorimetric data has shown that denaturation of PfMAP is non-equilibrium at heating rates from 0.125 to 2 K min–1. This means that the protein structure at these conditions is metastable and its stability (the apparent temperature of denaturation T m) is under kinetic control. It was shown that heat denaturation of this protein is a one-step kinetic process. The enthalpy of the process and its activation energy were measured as functions of temperature. The obtained data allowed us to estimate the heat capacity increment and the change in the number of bound protons during activation of the molecule. The data also suggest that the conformation of PfMAP at the transition state only slightly differs from its native conformation with respect to compactness, hydration extent and hydroxyl protonation.
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  • 6
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    Journal of thermal analysis and calorimetry 62 (2000), S. 435-441 
    ISSN: 1572-8943
    Keywords: calorimetry ; cement ; gravimetry ; sorption ; surface ; thermoporometry ; volumetry ; water adsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Dry cement powder and hardened cement paste were characterised by means of laser granulometry and volumetric measurement of the nitrogen adsorption isotherm at 77 K. Water sorption isotherms at ambient temperature were measured stepwise by means of a gravimetric apparatus. The isotherms show a very large hysteresis loop, reaching down to zero relative pressure, which reflects swelling of the cement gel. Thermoporometric measurements reveal that swelling of that gel consists in water take up within the continuously growing structure; no stable pore structure could be observed.
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  • 7
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    Journal of thermal analysis and calorimetry 63 (2000), S. 483-491 
    ISSN: 1572-8943
    Keywords: calorimetry ; consecutive first-order reactions ; thermokinetics ; time-parameter method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In order to enrich the thermokinetic research methods and enlarge the applicable range of the thermokinetic time-parameter method, the integral and differential thermokinetic equations of consecutive first-order reaction have been deduced, and the mathematical models of the time-parameter method for consecutive first-order reactions have been proposed in this paper. The rate constants of two steps can be calculated from the same thermoanalytical curve measured in a batch conduction calorimeter simultaneously with this method. The thermokinetics of saponifications of diester in aqueoushanol solvent has been studied. The experimental results indicate that the time-parameter method for the consecutive first-order reaction is correct.
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  • 8
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    Journal of thermal analysis and calorimetry 60 (2000), S. 473-487 
    ISSN: 1572-8943
    Keywords: calorimetry ; Ga-Ge-Sb alloys ; predicting methods ; ternary systems ; thermodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Thermodynamic investigations of Ga-GeSb0.855 section in the ternary system Ga-Ge-Sb, which is of a practical importance in electric-industry, are presented in this paper. Results of a comparative thermodynamic analysis at 1273 K obtained by Oelsen calorimetry and predicting methods - general solution model and Hajra's method are also given.
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  • 9
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    Journal of thermal analysis and calorimetry 60 (2000), S. 577-580 
    ISSN: 1572-8943
    Keywords: amorphous sulfur ; calorimetry ; heat of transformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The heat of transformation (Q ) of the chains in amorphous sulfur doped with selenium (0, 2, 4 and 6 at%Se) and phosphorous (0, 0.43, 0.86 and 1.28 at%P) was measured calorimetrically. All samples were remelted at temperature T f =443 K. The admixtures decrease the Q : at the measurement temperature 298 K the mean value of is equal to 37.6, 20.4 and 9.1 J g−1 for the samples S, S+6 at%Se and S+1.28 at%P respectively. The quantity of the evolved heat increases vs. the elevation of the measurement temperature. For the samples S+6 at%Se the value is equal 16.2 and 28.8 J g−1 at 288 to 303 K. For the samples S+1.28 at%P the value of increases from 9.1 to 25.0 J g−1 in the range of the measurement temperature from 293 to 308 K. The results are discussed on the basis of the theory of nucleation and growth of nuclei.
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  • 10
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    Journal of thermal analysis and calorimetry 60 (2000), S. 807-820 
    ISSN: 1572-8943
    Keywords: calorimetry ; crystallization ; PCL ; PEEK ; PEN ; PET ; polymer ; temperature modulation ; TMDMA ; TMDSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Quasi-isothermal temperature modulated DSC and DMA measurements (TMDSC and TMDMA, respectively) were performed to determine heat capacity and shear modulus as a function of time during crystallization. Non-reversible and reversible phenomena in the crystallization region of polymers can be observed. The combination of TMDSC and TMDMA yields new information about local processes at the surface of polymer crystals, like reversible melting. Reversible melting can be observed in complex heat capacity and in the amplitude of shear modulus in response to temperature perturbation. The fraction of material involved in reversible melting, which is established during main crystallization, keeps constant during secondary crystallization for PCL PET and PEEK. This shows that also after long crystallization times the surfaces of the individual polymer crystallites are in equilibrium with the surrounding melt. Simply speaking, polymer crystals are ‘living crystals’.
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  • 11
    Electronic Resource
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    Journal of thermal analysis and calorimetry 60 (2000), S. 831-843 
    ISSN: 1572-8943
    Keywords: animal cells ; calorimetry ; cell signalling cascades ; drug action ; enthalpy balance ; heat-flow rate ; integrated circuits ; therapeutic proteins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A formal explanation of Mayer's enthalpy balance method as applied to cell physiology is given with particular reference to striated muscle tissue. The approach is then extended to animal cells growing in a bioreactor, showing its use to optimise their growth and the production of therapeutic proteins, as well as defining the correct physiological conditions. Attention is then drawn to the value of the calorimetric-respirometric ratio in defining the anaerobic pathways operating simultaneously with respiration under fully aerobic conditions. An important field now is to resolve the metabolic costs of cell signalling cascades, an area that could demonstrate the coming importance of integrated circuit calorimetry.
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  • 12
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    Journal of thermal analysis and calorimetry 60 (2000), S. 845-850 
    ISSN: 1572-8943
    Keywords: calorimetry ; enthalpy ; heat of mixing ; metal alloys ; specific heat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A calorimetric study of alloy formation in Au-Cu and Au-In systems was carried out. The heats of mixing, ΔH mix, were measured at 1380,1484 and 1604 K for Au-Cu and at 1387, 1449 and 1505 K for Au-In in the full concentration range. The results of experiments were described by approximating equations. Observed values of ΔH mix were discussed using the phase diagrams of the systems. It was shown that the systems become closer to the ideal state with increasing temperature. From the experimental data, the dependencies of the enthalpies of the systems on the composition and temperature were estimated. The simultaneous effects of composition and temperature on enthalpy are represented in 3D diagrams. The specific heats of the alloys, in the temperature range of experiments, were derived from the slopes of enthalpy planes.
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  • 13
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    Journal of thermal analysis and calorimetry 61 (2000), S. 23-28 
    ISSN: 1572-8943
    Keywords: alcohols ; calorimetry ; complex formation ; cyclodextrins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The complexation of aliphatic alcohols by α- and β-cyclodextrins and their partially methylated derivatives has been studied by means of calorimetric titrations in aqueous solution. The methyl substituents have no pronounced influence upon the complex formation. α-Cyclodextrin and the partially methylated derivative form with only few exceptions more stable than β-cyclodextrin. With increasing chain length of the alcohols the values of the stability constants and reaction enthalpies increase in case of the complex formation with α-cyclodextrin and partially methylated α-cyclodextrin. In contrast the complex formation becomes disfavoured by the reaction entropy with an increasing number of methylene groups. The values of the reaction enthalpies with the β-cyclodextrins are close to zero. Thus the complexation is only favoured by entropic contributions.
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  • 14
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    Journal of thermal analysis and calorimetry 61 (2000), S. 219-228 
    ISSN: 1572-8943
    Keywords: calorimetry ; double-thermoanalytical curve method ; simple-order reactions ; thermokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A novel thermokinetic research method for determination of the rate constant of a reaction taking place in a batch conduction calorimeter under isothermal conditions is proposed: the double-thermoanalytical curve method. The method needs only the characteristic time parameter t m, the peak height Δm at time t m and the peak area a*m after time t m for two thermoanalytical curves measured with different initial concentrations of the reactants: it conveniently calculates the rate constants. The thermokinetics of four reaction systems were studied with this method, and its validity was verified by the experimental results.
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  • 15
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    Journal of thermal analysis and calorimetry 61 (2000), S. 527-537 
    ISSN: 1572-8943
    Keywords: aqueous solution ; calorimetry ; extremely diluted solutions ; mechanical treatments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An extensive thermodynamic study has been carried out on aqueous solutions, obtained through the iteration of two processes: a dilution 1:100 in mass and a succussion. The iteration is repeated until extreme dilutions are reached (less than 1⋅10–5 mol kg–1 ) to the point that we may call the resulting solution an 'extremely diluted solution'. We conducted a calorimetric study, at 25°C, of the interaction of those solutions with acids or bases. Namely, we measured the heats of mixing of acid or basic solutions with bidistilled water and compared them with the analogous heats of mixing obtained using the 'extremely diluted solutions'. Despite the extreme dilution of the latter solutions, we found a relevant exothermic excess heat of mixing, excess with respects to the corresponding heat of mixing with the untreated solvent. Such an excess has been found in about the totality of measurements, and of a magnitude being well beyond one that could arise any issue of sensibility of the instrumental apparatus. Here we thus show that successive dilutions and succussions can permanently alter the physico-chemical properties of the solvent water. The nature of the phenomena here described still remains unexplained, nevertheless some significant experimental results were obtained.
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  • 16
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    Perspectives in drug discovery and design 20 (2000), S. 29-42 
    ISSN: 1573-9023
    Keywords: calorimetry ; crystallography ; drug design ; ligand binding ; molecular recognition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The development of reliable, transferable methods that can compute the energy of interaction between protein sand ligands is a major challenge for computational chemistry. Understanding the energetics ofprotein-ligand interactions would not only provide powerful tools for prediction in structure-assisted ligand and library design, but also enrich our appreciation of the subtleties of structure that underlie molecular recognition in biological systems. One of the central problems in developing effective models is the quality and quantity of experimental data on the structure and thermodynamics of protein-ligand complexes. In this article we discuss some of the issues and some of the experimental programmes of research we have initiated to provide such data. We summarise the characteristics necessary for a model system and the experimental techniques available. This includes a discussion of calorimetry, inhibition assays and crystallographic results on series of complexes in our laboratory, including penicillin acylase, thrombin, sialidase and inparticular the oligopeptide binding protein, OppA. Aswell as discussing the lessons we have learnt about the characteristics of an ideal model system, we also present some preliminary analyses of what our combined structural and thermodynamic data have told us.
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  • 17
    ISSN: 1573-904X
    Keywords: amorphous ; freeze drying ; glass transition ; lactose ; relaxation time ; modulated temperature differential scanning ; calorimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Purpose. To evaluate the use of Modulated Temperature DSC(MTDSC) as a means of assessing the relaxation behaviour ofamorphous lactose via measurement of the heat capacity, glasstransition (Tg) and relaxation endotherm. Methods. Samples of amorphous lactose were prepared by freezedrying. MTDSC was conducted using a TA Instruments 2920 MDSCusing a heating rate of 2°C/minute, a modulation amplitude of ±0.3°Cand a period of 60 seconds. Samples were cycled by heating to 140°Cand cooling to a range of annealing temperatures between 80°C and100°C, followed by reheating through the Tg region. Systems werethen recooled to allow for correction of the Tg shift effect. Results. MTDSC enabled separation of the glass transition from therelaxation endotherm, thereby facilitating calculation of the relaxationtime as a function of temperature. The relative merits of using MTDSCfor the assessment of relaxation processes are discussed. In addition,the use of the fictive temperature rather than the experimentally derivedTg is outlined. Conclusions. MTDSC allows assessment of the glass transitiontemperature, the magnitude of the relaxation endotherm and the valueof the heat capacity, thus facilitating calculation of relaxation times.Limitations identified with the approach include the slow scanningspeed, the need for careful choice of experimental parameters and theTg shift effect.
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  • 18
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    Polymer bulletin 44 (2000), S. 285-292 
    ISSN: 1436-2449
    Keywords: Keywords: Melting ; polyethylene ; functionalization ; calorimetry ; copolymers ; crystallinity ; grafting ; crystallization ; equilibrium melting temperature.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The influence of the mole fractions and the chemical nature of the short branches on the level of crystallinity and on the melting temperature of functionalized polyethylene (PE) with diethylmaleate (DEM) was established. The results can be interpreted to yield two interesting points: the participant sequences in the crystallization decrease with the degree of grafting, which seems to indicate that the functionalization occurs at random, confirming evidences reported in the literature about the insertion on the secondary carbons. On the other hand, the study of the equilibrium melting temperatures, indicated that, the grafting increase the number of branches but not in a purely random arrangement. This last point clarify previous evidences obtained by FTIR, that report that grafting at the beginning of the reaction proceeds by radical attacks on the terminal unsaturations.
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  • 19
    ISSN: 1573-1111
    Keywords: calixarene ; [60]fullerene ; porphyrin ; inclusion complex ; calorimetry ; fluorescencespectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The calixarene-fullerene interaction,which causes only a slight change in the absorptionspectra, has been substantiated by calorimetricmeasurements: the Δ H° values arecomparable with those obtained from the associationconstants estimated by a spectroscopic method. Furthermore, we determined the association constantbetween homooxacalix[3]arene and [60]fullerenederivatives with a porphyrin moiety by fluorescencespectra.
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