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
  • 1
    Electronic Resource
    Electronic Resource
    Preparation, spectral studies and X-ray crystal structure of 1,3,5-triphenyl-1,5-pentanedione, C23H20O2 (1994)
    Springer
    Journal of chemical crystallography 24 (1994), S. 511-515 
    Details
    ISSN: 1572-8854
    Keywords: C23H20O2 ; diketone ; cis arrangement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract 1,3,5-triphenyl-1,5-pentanedione, C23H20O2, has been prepared and characterized by spectroscopic methods and single crystal X-ray analysis. Crystals are monoclinic, space groupP21/n, a=28.124(4),b=5.997(1),c=10.434(1)Å, β-98.42(1)Å,Z=4. The structure has been refined to a finalR-value of 0.040 for 1625 reflections withF o〉3σ(F o). The compound contains the two carbonyl groups in a mutuallycis arrangement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01666729
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Target enzyme inhibition by novel thion analogues of monocrotophos: An acute In Vivo study in the rat (1993)
    Springer
    Bulletin of environmental contamination and toxicology 51 (1993), S. 409-415 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00201760
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A comparative study of the kinetics and bioavailability of pure and soil-adsorbed naphthalene in dermally exposed male rats (1994)
    Springer
    Archives of environmental contamination and toxicology 26 (1994), S. 504-509 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The aim of this study was to utilize pharmacokinetic techniques to assess the bioavailability of sandy or clay soil-adsorbed naphthalene vs chemical alone following dermal treatment of male rats. Animals were exposed to 43 μg total of 14C-naphthalene (pure or adsorbed to one of two soils) introduced into a shallow glass cap covering a 13-cm2 area on the skin of each rat. While both soils delayed the time to reach maximum plasma concentration of radioactivity and significantly increased the half-life of plasma absorption, only sandy soil significantly decreased the peak plasma concentration of radioactivity versus the pure compound. Within 12 h after dermal application, approximately 50% of the naphthalene dose was excreted in the urine of the pure and clay soil-adsorbed groups. However, when naphthalene was adsorbed to sandy soil, the percentages of the initial dose excreted in the urine collected between 0–12 h and 12–24 h were nearly equal (33–39%). Furthermore, sandy soil adsorption shifted the secondary excretion route from expired air to feces and significantly lowered the amount of radioactivity in expired air relative to naphthalene alone. In the presence of sandy soil, a significantly larger amount of radioactivity washed off of the skin application sites. In all groups the predominant urinary metabolites determined by high performance liquid chromatography were 2,7- and 1,2-dihydroxynaphthalenes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00214154
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Kinetics of hydrolysis of amino acid esters in the presence of aquocomplexes involving ethylenediamine, diethylenetriamine and triethylenetetramine ligands. Part 2. Cobalt(II), cobalt(III), platinum(II) and palladium(II) (1994)
    Springer
    Transition metal chemistry 19 (1994), S. 481-483 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Aquocomplexes of cobalt(II), cobalt(III), palladium(II) and platinum(II) involving (H2NCH2)2, [H2N(CH2)2]2NH and [H2N(CH2)2NHCH2]2 as ligands were prepared and characterized. The kinetics of base hydrolysis of the amino acid esters H2NCH2CO2Me·HCl, HOC6H4CH2CH (NH2)CO2Me·HCl, MeS(CH2)2CH(NH2)CO2Me·HCl, HSCH2CH(NH2)CO2Et·HCl, C3H3N2CH2CH(NH2)-CO2Me·2HCl and [—SCH2CH(NH2)CO2Me]2·2HCl in the presence of these complexes have been studied. The rate of hydrolysis is influenced substantially by these complexes and the second order rate constants are some 10–90 times greater than those obtained in the presence of simple metal ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00136354
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Catalytic activities of Schiff base aquocomplexes of copper(II) towards hydrolysis of amino acid esters (1994)
    Springer
    Transition metal chemistry 19 (1994), S. 524-526 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Solid aquo CuII complexes of Schiff bases derived from amino acids have been prepared and characterized. Using a pH-stat method, the kinetics of base hydrolysis of the amino acid esters H2NCH2CO2Me·HCl (GE), (HO)-C6H4CH2(NH2)CO2Me·HCl (TE), MeS(CH2)2CH(NH2)-CO2Me·HCl (ME), HSCH2CH(NH2)CO2Et·HCl (CE), C3H3N2CH2CH(NH2)CO2Me·2HCl (HE) and [—SCH2-CH(NH2)CO2Me]2·2HCl (CysE) have been studied. The complexes enhanced the rate of hydrolysis substantially, the values of the second-order rate constants being some 10–50 times greater than those obtained in the presence of the simple CuII ion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00136366
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Kinetics of hydrolysis of amino acid esters in presence of aquocomplexes involving ethylenediamine, diethylenetriamine and triethylenetetramine ligands. Part 1-copper(II) and nickel(II) (1993)
    Springer
    Transition metal chemistry 18 (1993), S. 545-547 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Aquocomplexes of copper(II) and nickel(II) involving (H2NCH2)2, H2NCH2CH2NHCH2CH2NH2 and H2NCH2CH2NHCH2CH2NHCH2CH2NH2 as ligands were prepared and characterised. Using a pH-stat method, the kinetics of the base hydrolysis of amino acid esters such as H2NCH2CO2CH3·HCl (GE), (HO)C6H4CH2-(NH2)CO2CH3·HCl (TE), CH3S(CH2)2CH(NH2)CO2CH3· HCl (ME), HSCH2CH(NH2)CO2C2H5·HCl (CE), $${\text{CH}}_{\text{2}} {\text{CH(NH}}_{\text{2}} ){\text{CO}}_{\text{2}} {\text{CH}}_{\text{3}} \cdot 2{\text{HCI (HE)}}$$ (HE) and [—SCH2CH(NH2)CO2CH3]2·2HCl (CysE) was studied. These complexes substantially enhance the rate of hydrolysis, the values of the second-order rate constants being some 10–30 times greater than those obtained in the presence of simple metal ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00191117
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Parathyroid hormone in urinary stone patients (1993)
    Springer
    Molecular and cellular biochemistry 121 (1993), S. 1-4 
    Details
    ISSN: 1573-4919
    Keywords: urolithiasis ; hyperparathyroidism ; parathyroid hormone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract To evaluate the role of parathyroids in calculus disease, the parathyroid hormone levels were determined in 22 control subjects and 42 stone (14 with bladder stone and 28 with kidney stone) patients. Serum calcium, inorganic phosphate, alkaline phosphatase and parathyroid hormone and urinary excretion of calcium and inorganic phosphate were determined. It was found that normocalcemic and normocalciuric stone patients had slightly higher levelsss of parathyroid hormone (irrespective of the site of the stone) and the difference was not statistically significant as compared with control subjects although some of the patients with calculus disease were hyperparathyroid. Serum alkaline phosphatase was increased while there was an increase in urinary calcium excretion in kidney stone patients and oxalate in all patients as compared with control subjects. The increase in inorganic phosphate was, however, not different from the control subjects. The subclinical hyperparathyroidism and stone formation in these patients are not correlated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00928693
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Film-thickness effects on the optical and electrical properties of Cu-GeO2 thin cermet films (1993)
    Springer
    Journal of materials science 28 (1993), S. 3675-3680 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effect of film thickness on the optical and electrical properties of Cu-30 wt % GeO2-70 wt % thin cermet films prepared by electron-beam deposition at about 10−3 Pa and at a substrate temperature of 300 K is reported. The ultraviolet, visible and direct current (d.c.) conductivity results are analysed with the aim of determining the optical band gap,E opt, the width of the band tails,E e, and the d.c. thermal activation energy,E a. It was found that the optical energy gap increases with increasing thickness and that the absorption was due to indirect transitions ink-space. The general feature of the absorption edge remains similar for both unannealed and annealed films, but annealing has the effect of decreasingE opt. The d.c. conductivity results show thatE a decreases with increasing thickness. From a knowledge ofE opt andE a, a probable model of the electronic band structure in Cu-GeO2 thin films has been suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01159853
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Multilevel optimization applied to hull girder design using three panel forms (1994)
    Springer
    Structural and multidisciplinary optimization 7 (1994), S. 126-137 
    Details
    ISSN: 1615-1488
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A multilevel design scheme for ship's hull girders (longitudinal members between two adjacent transverse frames) is presented in this paper. This design scheme handles, very conveniently, the complexity of using an optimization algorithm for such complex design problems having a large number of design variables, nonlinear constraints dealing with different failure modes and interactions among substructures, and nonlinear design objectives. The conventional multilevel design technique is modified by introducing an approach called constraint coordination to increase the probability of achieving the overall optimum very efficiently. The scheme is demonstrated by application to the structural design of hull girders with simple structural modelling to represent inland waterway ships on which there was a special emphasis in the original research project (Rahman 1991). Three possible panel (consisting of one stiffener and its attached plating) forms; tee stiffened, flat-bar stiffened and corrugated, are optimized to synthesize the hull girder in order to achieve the most efficient structure. The effect of price-structure (labour rate to material price ratio) on the design is also investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01742518
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Metathesis degradation of natural rubber (1990)
    Springer
    Polymer bulletin 23 (1990), S. 119-126 
    Details
    ISSN: 1436-2449
    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 Metathesis reaction of natural rubber was carried out using tungusten hexachloride and tetramethyl tin in chlorobenzene. The rubber had to be purified by several times precipitations before the reaction. Molecular weight decreased very much with the progress of reaction and with the increase of temperature. However, NMR studies indicated considerable decreases of carbon-carbon double bonds, which can not be explained by simple metathesis reaction. Some other reactions which consumed unsaturation have to be taken into account to elucidate the exact structure of resultant oligomers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983973
    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...