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  • Wiley-Blackwell  (33)
  • American Association for the Advancement of Science  (19)
  • 1990-1994  (36)
  • 1965-1969  (16)
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  • 1
    Electronic Resource
    Electronic Resource
    Polyurethane elastomers with hydrolytic and thermooxidative stability. II. Polyurethanes with n-alkylated polyurethane soft blocks (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 3685-3699 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Block copolyurethanes with N-alkylated polyurethanes as nonself-associating soft segments are prepared. The polymers compare well in hydrolytic stability with block copoly(N-alkylamide urethane)s prepared in an earlier study but have better dimensional stability on exposure to moist heat. They show comparable hydrolytic stability and better oxidative stability than a poly(ether urethane) from the earlier study. The effect of different alkyl substituents on tensile properties and thermostability is studied. The tensile properties are also examined as a function of soft-segment molecular weight at constant weight-percent of hard-block. It is shown that yield stress and ultimate stress increase and elongations decrease as the soft-block M̄n increases. DSC measurements do not generally show well defined endotherms with few exceptions but dynamic mechanical testing of some samples does show transitions between 14 and 23°C.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1990.080281314
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  • 2
    Electronic Resource
    Electronic Resource
    Polyurethane elastomers with hydrolytic and thermooxidative stability. I. Polyurethanes with N-alkylated polyamide soft blocks (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 1473-1482 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Segmented polyurethanes with N-alkylated amides as soft blocks as prepared. Comparisons are made with both a poly(ester urethane) and a poly(ether urethane) with the same hard block; the poly(amide urethane) is more hydrolytically stable than the polyester containing material and demonstrates greater thermooxidative stability than that with the polyether moiety. The aliphatic poly(amide urethane)s remain transparent upon exposure to uv light.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1990.080280614
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of ambient polar and non-polar volatile organic compounds (VOCs) by thermal desorption, high resolution gas chromatography-mass spectrometry (TD/HRGC/MS) (1994)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 17 (1994), S. 187-190 
    Details
    ISSN: 0935-6304
    Keywords: HRGC-MS ; Thermal desorption ; Cryofocusing ; Air analysis ; Indoor and outdoor air ; Polar and non-polar hydrocarbon ; Volatile organic compounds ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240170315
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  • 4
    Electronic Resource
    Electronic Resource
    Design and performance of an electrospray ionization source for a doubly-focusing magnetic sector mass spectrometer (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 369-372 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Design considerations for an electrospray ionization source on a double-focusing magnetic sector mass spectrometer are discussed. A source with two additional pumping stages before the source housing has been constructed. High sensitivity for multiply charged ions from high molecular weight proteins up to 66 kDa is demonstrated with this source.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290041004
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  • 5
    Electronic Resource
    Electronic Resource
    A mass spectrometric investigation of mono-, di- and trimethylenebis (disphenylphosphine)- Pt(II)-cis-dichloro and -dicyano derivatives (1991)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 5 (1991), S. 479-483 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The mass spectrometric behaviour of mono-, di- and trimethylenebis(diphenylphosphine)-Pt(II)-cis-dichloro and -dicyano drivatives has been studied with the aid of two different ionization techniques (electron ionization and fast-atom bombardment) and metastable ion studies, with the aim of finding the most suitable mass spectrometric technique for determining the real monomeric or dimeric structure of such compounds. Electron ionization mass spectrometry led to the best results in terms of molecular ion identification and production of fragment ions well-related to the original structure. On the contrary, fast-atom bombardment led to the formation of dimeric species for Pt{1,2-bis(diphenylphosphino)methane}Cl2 and Pt{1,2-bis(diphenylphosphino)methane}(CN)2 due to the high reactivity of the monomeric molecules in the condensed phase.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290051012
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  • 6
    Electronic Resource
    Electronic Resource
    Characterization of kerogens by matrix-assisted laser desorption ionization mass spectroscopy (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 823-828 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Two kerogen samples from shales of different geological age, selected from each of Types I, II and III, have been characterized by matrix-assisted laser desorption ionization mass spectroscopy (MALDI-MS). A Kratos Kompact MALDI III time-of-flight mass spectrometer equipped with a nitrogen laser operated at 337 nm was used on samples mounted in a matrix of sinapinic acid. The spectrometer was used in linear mode with a mass range up to 270 000 u and an ion extraction voltage of 20 kV. Individual spectra from 50 laser shots at low laser fluence were summed for each spectrum. The present study is a first attempt at characterizing kerogens by MALDI-MS. At low mass (200-500 u) families of peaks consisting of overlapping homologous series of apparently polar compounds have been observed: these peaks appear to be distinct from those due to the matrix material. In higher mass regions of the spectra, continua of masses extending from 1000 u up to around 10 000 u were observed; ions at higher masses were separated to baseline up to masses of 50 000 u. Evidence was found for a relationship between the minimum laser power sufficient for activating the MALDI-ionization process and the geological age of the kerogens; the laser power decreased as the geological age increased. In the case of one kerogen, a high laser fluence was used to generate molecular ions up to the detection limit of the mass spectrometer, in excess of 260 000 u. This paper presents results from a preliminary study of kerogens which requires an in-depth examination of the desorption process in complex mixtures.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290081006
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  • 7
    Electronic Resource
    Electronic Resource
    Identification of a mouse B-type cyclin which exhibits developmentally regulated expression in the germ line (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 33 (1992), S. 259-269 
    Details
    ISSN: 1040-452X
    Keywords: Cell cycle ; Germ cells ; Spermatogenesis ; Oogenesis ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: To begin to examine the function of cyclins in mammalian germ cells, we have screened an adult mouse testis cDNA library for the presence of B-type cyclins. We have isolated cDNAs that encode a murine B-type cyclin, which has been designated cycB1. cycB1 was shown to be expressed in several adult tissues and in the midgestation mouse embryo. In the adult tissues, the highest levels of cycB1 transcripts were seen in the testis and ovary, which contain germ cells at various stages of differentiation. The major transcripts corresponding to cycB1 are 1.7 and 2.5 kb, with the 1.7 kb species being the predominant testicular transcript and the 2.5 kb species more abundant in the ovary. Examination of cDNAs corresponding to the 2.5 kb and 1.7 kb mRNAs revealed that these transcripts encode identical proteins, differing only in the polyadenylation signal used and therefore in the length of their 3′ untranslated regions. Northern blot and in situ hybridization analyses revealed that the predominant sites of cycB1 expression in the testis and ovary were in the germinal compartment, particularly in early round spermatids in the testis and growing oocytes in the ovary. Thus cycB1 is expressed in both meiotic and postmeiotic cells. This pattern of cycB1 expression further suggests that cycB1 may have different functions in the two cell types, only one of which correlates with progression of the cell cycle. © 1992 Wiley-Liss, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080330305
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of the isotope enrichment of one or a mixture of two stable labelled tracers of the same compound using the complete isotopomer distribution of an ion fragment; theory and application to in vivo human tracer studies (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1993), S. 600-612 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Calculations of flux rates for stable isotope tracer studies are based upon enrichment values of an infused tracer. We propose the determination of enrichment values by gas chromatography/mass spectrometry, which is based on tracer mole fraction and mass spectrometer signals, normalized over the total signal of an ion fragment isotopomer distribution. The method accounts for overlap of the signals of one or two tracers and the tracee, high tracer mole fraction and incomplete labelling of the (infused) tracer. For the single and multiple tracer case a linear relationship between tracer mole fraction (from zero to one) and all normalized mass spectrometer signals is derived. This linearity over the entire range is demonstrated with a single (1-13C)glucose tracer and for mixtures of (1-13C)- and (3,3-2H2)tyrosine tracers. The linearity allows determination of the tracer mole fraction for two tracers, using multiple linear regression. The corresponding calibration can rely on measurements of the pure tracer and tracee compound, without weighing or check for chemical purity. This is compared with a calibration based on tracer/tracee mixtures. Estimates for the tracer mole fraction are slightly better if based on a calibration, using standard mixtures. In all cases the tracer mole fraction can be determined with high precision (coefficient of variation smaller than 5%) and high accuracy. For tyrosine it is demonstrated that the measurement of seven channels rather than three, for the main isotopomers, does not reduce the precision in the prediction of the tracer mole fraction. Equations are also derived to use the tracer mole fraction to estimate the endogenous production of the tracee under study conditions, assuming a steady state of the host metabolism.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200221008
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  • 9
    Electronic Resource
    Electronic Resource
    Instrumentation, techniques, and applications of electron microscopy in the solid state physics group at Glasgow university (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Microscopy Research and Technique 24 (1993), S. 316-332 
    Details
    ISSN: 1059-910X
    Keywords: TEM ; CTEM ; STEM ; Electron energy loss spectroscopy (EELS) ; Energy dispersive X-ray spectroscopy (EDX) ; Radiation damage ; Mass loss ; Lorentz microscopy ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: This review discusses some of the work performed by the Solid State Physics Group at Glasgow University. A major aim of the group is to obtain quantitative information with high spatial resolution and to do this reliably requires a thorough understanding of both the instrumentation and the interactions between the electron beam and the specimen. Thus the first part of the review discusses those aspects of instrumentation and techniques that the group has considered in detail while the final part deals with applications which involve the study of a wide range of materials covering metallurgical, semiconductor, organic, and magnetic systems. In all these applications, the results from a range of techniques have been required to provide as complete a picture of the material as possible. © 1993 Wiley-Liss, Inc.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1070240405
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  • 10
    Electronic Resource
    Electronic Resource
    Characterization of coal by matrix-assisted laser desorption ionization mass spectrometry. I. The argonne coal samples (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 808-814 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The Argonne set of coals cover the rank range from lignite to semi-anthracite; these samples have been studied by matrix-assisted laser desorption mass spectrometry (MALDI-MS) in a time-of-flight mass spectrometer equipped with a nitrogen laser at 337 nm, using sinapinic acid as matrix. The coal particle size was less than 5 microns. The characteristics of the MALDI-MS spectra of the set of coals were found to be rank-related; desorption from high-rank coals was found to take place with greater relative ease than from low-rank coals. Two major features were found in all spectra: a homologous series of peaks in the 200-500 u mass range and an intense peak between 1000 and 5000 u, the particular shape of the peak depending on coal rank. A continuum of lower intensity peaks extending to very large molecular masses was found in all spectra, the upper limit of molecular masses increasing with coal rank at the same laser fluence. The effect of changes in laser power on spectra was investigated: upper mass limits were found to increase with power up to the detection limit of the instrument but low-mass parts of spectra were found to distort, possibly due to detector overloading. A maximum laser fluence value acceptable over the coal-rank range represented by these samples could therefore not be easily defined. None of the mass spectra showed evidence of the presence of either carbon clusters or fullerene formation, indicating that laser fluences did not reach intensities high enough to induce substantial secondary reactions. Comparing molecular mass distributions detected by MALDI of coal pyrolysis tars and directly from coals suggests the MALDI and pyrolytic mechanisms of volatile release to be structurally different; in particular, the preferential evaporation of lighter species which occurs during pyrolytic tar evolution (and during field-ionization mass spectroscopy) appears to evole material with a more restricted range of molecular masses compared to laser desorption mechanisms.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290081004
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