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  • 1
    Electronic Resource
    Electronic Resource
    Laser chemical physics II: Infrared multiple photon dissociation (1982)
    Springer
    Applied physics 28 (1982), S. 180-189 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 33
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697844
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  • 2
    Electronic Resource
    Electronic Resource
    Carbon-13 depletion in an estuarine bivalve: Detection of marine and terrestrial food sources (1982)
    Springer
    Oecologia 55 (1982), S. 110-113 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Stable carbon isotope analysis was used to define the food sources of bivalve Chione (Austrovenus) stutchburyi in the Avon-Heathcote Estuary, Christchurch, New Zealand. δ13C values of C. stutchburyi tissue were significantly different (from -16.7‰ to -23.5‰ relative to the PDB standard) at five locations separated by less than 4 km but subject to different hydrological regimes. This is related to differences in the isotopic composition of the suspended particulate matter of the inflowing water. C. stutchburyi is shown to utilise carbon of terrestrial and marine origin depending upon its position within the estuary and local hydrology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386725
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  • 3
    Electronic Resource
    Electronic Resource
    The use of TA — GLC — MS as a quantitative specific EGA technique for the investigation of complex thermal decomposition reactions: The thermal decomposition of calcium propanoate (1982)
    Springer
    Journal of thermal analysis and calorimetry 25 (1982), S. 299-311 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein vielseitiges und flexibles System zur Analyse von gebildeten Gasen wird beschrieben, das GLC, MS (in Massen-scanning und SIM Betriebsweise) und GLC-MS umfaßt. Damit können die in zwei differentialthermoanalytischen Einheiten, einer Thermowaage oder einem direkt mit dem MS- oder GLC-Gerät gekoppelten Mikroofen aus den zu untersuchenden Substanzen entwickelten Gase analysiert werden. Einzelheiten der komputerkontrollierten Datengewinnung und Steuerung werden angegeben. Die Techniken werden zur Untersuchung der thermischen Zersetzung von Calciumpropionat herangezogen. Mechanismen werden vorgeschlagen, die die beobachteten Zersetzungsprodukte und die Festkörperreaktion erklären. Beweise werden dafür erbracht, daß bei letzterer eine Keimbildung und darauffolgendes zweidimensionales Wachstum vor sich geht, wobei die Aktivierungsenergie 315 kJ·mol−1 und der präexponentielle Faktor 4.8·1021·s−1 beträgt.
    Abstract: Резюме Описана многосторон яя и гибкая система анализа выделяющего ся газа на основе использования газо-ж идкостной хроматогр афии (ГЖХ), масс-спектрометрии (MC) и совмещенного метода ГЖХ и MC. Термовес ы или микропечь соеди нены прямо с массспектрометром или газо-жидкостным х роматографом, что поз воляет анализировать газы, выделяющиеся из веще ств в этих двух различ ных термических аналити ческих блоках. Приведены детали сбо ра и обработки данных с помощью ЭВМ. Метод был использ ован для изучения термиче ского разложения про пионата кальция. Предложен ме ханизм реакций образования продукт ов разложения и тверд отельных процессов. Предсравл ены доказательства в пользу того, что твер дотельные процессы п роисходят через стадию образов ания центров кристаллиза ции, за которой следуе т двухразмерный рост с энергией активации 315 кдж.моль−1 и предэкшо ненциальным факторо м 4,8·1021 сек−1.
    Notes: Abstract A versatile and flexible system is described for evolved gas analysis using a GLC, MS (mass scan and SIM modes) and GLC-MS. Gases evolved from materials in two differential thermal analysis units, a thermobalance or a micro-furnace linked directly to the MS or GLC can be analysed. Details are given of computer controlled data acquisition and processing. The techniques are applied to the thermal decomposition of calcium propanoate. Mechanisms are suggested to account for the observed decomposition products and the solid state process. Evidence is presented to support the view that the latter occurs via nucleation followed by two-dimensional growth with an activation energy of 315 kJ mol−1 and a pre-exponential factor of 4.8×1021s−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01912955
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  • 4
    Electronic Resource
    Electronic Resource
    Depth integrating samplers for use in limnocorrals (1982)
    Springer
    Hydrobiologia 94 (1982), S. 71-75 
    Details
    ISSN: 1573-5117
    Keywords: zooplankton ; phytoplankton ; depth integrating sampler ; enclosure ; limnocorral
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Constructional details of a zooplankton and a phytoplankton sampler are given. Both samplers are designed for use in shallow limnocorrals (5 m deep enclosures) and both give samples integrated with respect to depth and offer a considerable saving in time over other sampling methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008634
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  • 5
    Electronic Resource
    Electronic Resource
    Iridoid glycosides in the nectar ofCatalpa speciosa are unpalatable to nectar thieves (1982)
    Springer
    Journal of chemical ecology 8 (1982), S. 1025-1034 
    Details
    ISSN: 1573-1561
    Keywords: Catalpa speciosa ; catalpol ; catalposide ; iridoid glycosides ; nectar thieves ; pollination ; toxic nectar
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The floral nectar ofCatalpa speciosa has a chemical mechanism that limits thievery. A bioassay employing sphingid larvae,Ceratomia catalpae, shows that catalpa iridoid glycosides are present in the floral nectar. When potential nectar thieves are fed nectar, a sucrose solution of identical concentration, or a sucrose solution plus 0.4% catalpol and 0.4% catalposide (catalpa iridoids), the thieves drink significantly more of the pure sucrose solution than either of the other two sugar sources. Those thieves that drink either the nectar or the sucrose solution plus catalpa iridoids develop behavioral abnormalities including regurgitation and loss of locomotion. The response of the potential nectar thieves to nectar or the sucrose solution plus catalpa iridoids cannot be distinguished by the amount consumed or by their behavior. The legitimate diurnal pollinators ofC. speciosa are not affected by the iridoid glycosides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987883
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  • 6
    Electronic Resource
    Electronic Resource
    The impact of financial aid on women's demand for higher education (1982)
    Springer
    Research in higher education 17 (1982), S. 345-361 
    Details
    ISSN: 1573-188X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract The Educational Amendments of 1972 marked a new direction in public policy regarding the scope and purpose of financial aid to higher education. Aid became more “student-oriented,” and equality of opportunity for higher education became a goal. This empirical study with national longitudinal data has made a start in policy evaluation of the effect of the 1972 Educational Amendments on the higher education acquired by young women. The most important result of financial aid receipt for young women is that those who received aid averaged 0.64 more years completed of higher education and averaged .145 greater graduation probability than similar women who did not receive aid. These results were obtained in multiple regression models in which the effects of marital status, parental background, geographic locations and economic characteristics, and tuition level were controlled for. These results suggest that policy attempts to stimulate the higher education acquired by enrolled young women by increasing the availability of financial aid are well founded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00977902
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  • 7
    Electronic Resource
    Electronic Resource
    Work in college and subsequent wage rates (1982)
    Springer
    Research in higher education 17 (1982), S. 165-178 
    Details
    ISSN: 1573-188X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract This is an empirical study of early postenrollment wage determinants of white young men in the 1966 to 1971 period. Data are from the National Longitudinal Survey for young men. The focus is on student labor force status as a determinant of postenrollment wage rates. As such, the results are related to the combined employment and college enrollment goal expressed repeatedly in federal work-study programs from the 1930s to date. Results suggest that work while enrolled may not only support the student, but mitigate transition problems to full-time work after enrollment. The major result, found with OLS multiple regression techniques, is that student job holding significantly and positively increased postenrollment wage rates relative to youth who neither worked nor looked for work as students. This indirect effect implies that the social cost of the college work-study program may be less than the federal outlays if the extra work experience enables a youth to obtain a more productive and higher paying job after enrollment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00973717
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  • 8
    Electronic Resource
    Electronic Resource
    The equilibrium field near the tip of a crack for finite plane strain of incompressible elastic materials (1982)
    Springer
    Journal of elasticity 12 (1982), S. 65-99 
    Details
    ISSN: 1573-2681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This investigation is concerned with the deformations and stresses in a slab of all-around infinite extent containing a traction-free plane crack, under conditions of plane strain. The analysis is carried out within the framework of the fully nonlinear equilibrium theory of homogeneous and isotropic incompressible elastic solids. For a fairly wide class of such materials and general loading conditions at infinity, assymptotic estimates appropriate to the various field quantities near the crack-tips are deduced. For a subclass of the materials considered, these results — in contrast to the analogous predictions of the linearized theory — lead to the conclusion that the crack opens up in the neighborhood of its tips even if the applied loading is antisymmetric about the plane of the crack, (e.g., Mode II loading). It is shown further that the non-linear global crack problem corresponding to such a loading in general cannot admit an antisymmetric solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00043706
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  • 9
    Electronic Resource
    Electronic Resource
    Book reviews (1982)
    Springer
    Higher education 11 (1982), S. 237-247 
    Details
    ISSN: 1573-174X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00139691
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  • 10
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    Transformation induced by Abelson murine leukemia virus involves production of a polypeptide growth factor (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-05-21
    Description: Rat embryo fibroblasts transformed by Abelson murine leukemia virus (MuLV) produce and release a transforming growth factor (TGF). Production of this factor is correlated with a tyrosine-specific protein kinase that is functionally active and is associated with the major Abelson MuLV gene product, P120. Transformation-defective mutants of Abelson MuLV do not transform cells, do not have their virus coded transforming gene product phosphorylated in tyrosine, and do not induce TGF production. Abelson MuLV-induced TGF morphologically transforms cells in culture, competes with 125I-labeled epidermal growth factor (EGF) for binding to cell receptors, and induces phosphorylation of tyrosine acceptor sites in the 160,000-dalton EGF membrane receptor. After purification to homogeneity, Abelson virus-induced TGF migrates as a single polypeptide with an apparent size of 7400 daltons as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Twardzik, D R -- Todaro, G J -- Marquardt, H -- Reynolds, F H Jr -- Stephenson, J R -- New York, N.Y. -- Science. 1982 May 21;216(4548):894-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6177040" target="_blank"〉PubMed〈/a〉
    Keywords: Abelson murine leukemia virus ; Animals ; *Cell Transformation, Neoplastic ; *Cell Transformation, Viral ; Molecular Weight ; Peptides/*metabolism ; Phosphotyrosine ; Rats ; Receptor, Epidermal Growth Factor ; Receptors, Cell Surface/metabolism ; Transforming Growth Factors ; Tyrosine/analogs & derivatives/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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