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  • 1980-1984  (91)
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Year
  • 11
    Electronic Resource
    Electronic Resource
    Studies of fluorescence inDrosophila compound eyes: changes induced by intense light and vitamin A deprivation (1984)
    Springer
    Journal of comparative physiology 154 (1984), S. 297-305 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ultraviolet light excites a red fluorescence fromDrosophila R1–6 rhabdomeres which is superimposed on a blue background emission. Metarhodopsin (M570) pigment generates some or all of the vitamin A dependent red emission. However, the excitation spectrum for red emission peaks in the UV. This suggests that the pigment which sensitizes R1–6's visual pigment to UV light (sensitizing pigment) absorbs the UV light, sensitizing metarhodopsin's fluorescence by energy transfer. Blue emission is neither from sensitizing pigment nor from visual pigment as shown by vitamin A deprivation studies. Very intense UV or blue stimulation causes these changes: (1) conversion of visual pigment into a fluorescent product; (2) destruction of this fluorescent product; (3) a decrease in the blue background fluorescence (even in vitamin A deprived flies); and (4) a permanent destruction of visual pigment and retinal degeneration. The first effect requires intensities 3 log units brighter than needed to interconvert rhodopsin and metarhodopsin 1/2 way to photoequilibrium. UV light is about 5 times as effective as blue light for the conversion of visual pigment into fluorescent product.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00604996
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  • 12
    Electronic Resource
    Electronic Resource
    Demonstration of endogenous intracisternal type a particles in early mouse zygotes (1983)
    Springer
    Bulletin of experimental biology and medicine 96 (1983), S. 992-995 
    Details
    ISSN: 1573-8221
    Keywords: endogenous intracisternal type A particles ; zygote ; embryogenesis ; differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00833061
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  • 13
    Electronic Resource
    Electronic Resource
    Characteristics of proteins of type A intracytoplasmic particles produced by human cells (1981)
    Springer
    Bulletin of experimental biology and medicine 91 (1981), S. 336-339 
    Details
    ISSN: 1573-8221
    Keywords: type A cytoplasmic particles ; radioimmunoprecipitation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00839366
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  • 14
    Electronic Resource
    Electronic Resource
    Aminostratigraphy of Pleistocene and Holocene deposits (reply) (1980)
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 604-604 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MILLER ET AL. REPLY-Our Corbi-cula from Swanscombe are not from, but merely correlated with, the Middle Gravels there. If the correlation is correct, then the absence of Corbicula in the Swanscombe Lower Loam and Lower Gravel, at an elevation intermediate between the Middle Gravels and Grays (with ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/283604a0
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  • 15
    Electronic Resource
    Electronic Resource
    New Epstein–Barr virus variants from cellular subclones of P3J-HR-1 Burkitt lymphoma (1982)
    [s.l.] : Nature Publishing Group
    Nature 295 (1982), S. 160-163 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] HR-1 cells were cloned in agarose with an efficiency of 37% (refs 10,11). The copy number of EBV genomes in 29 subclones derived in two experiments (FF452, GG68) was determined by nucleic acid spot hybridization12 (Fig. la). The parental HR-1 line contained -300 genomes per cell; all subclones had ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/295160a0
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  • 16
    Electronic Resource
    Electronic Resource
    Seasonal changes in morphological structuring in a guild of benthic stream fishes (1984)
    Springer
    Oecologia 63 (1984), S. 106-109 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ecomorphological model which attempts to identify important variation in the total morphology of groups of animals has been used with some success in communities of fishes. The applicability of the model to subsets of the community, such as guilds of ecologically similar species, is uncertain, and the effects of the possible changes in correlations among morphological variables caused by demographic changes across seasons is unknown. An ecomorphological model is applied to a guild of benthic stream fishes from the Tombigbee River, Mississippi. The model is found to describe structuring in the guild based on aspects of the trophic morphology and the length of the body. Morphologically distinct groups of species are described by the model. The effect of indeterminate growth seems not to be of sufficient magnitude to change groupings across seasons. However, species associations within morphological groups change seasonally. I conclude that ecomorphological models may be properly applied to community subsets, but the interpretation of the model must consider the nature of the data set with respect of seasonality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379791
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  • 17
    Electronic Resource
    Electronic Resource
    Dynamics of pollutant photoreactions in the hydrosphere (1984)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 319 (1984), S. 119-125 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Light-induced transformations of organic chemicals have been studied to provide kinetic results concerning the influence of sunlight on pollutant behavior in lakes and rivers. A review of these studies shows that the humus component of the dissolved organic matter in natural water affects aquatic photoreactions in two important ways: by attenuating sunlight and by sensitizing photoreactions. Studies of humus-sensitized photoreactions of furans, sulfides, dienes, nitroaromatic compounds, and other chemicals are discussed. Research concerning effects of aquatic particulates on pollutant photoreaction rates are reviewed. Suspended sediments mainly affect photolysis rates through light attenuation and scattering. Algae, diatoms, and bacteria accelerate light-induced transformations of anilines and phosphorothioate insecticides, suggesting that photobiological processes may play a significant role in the breakdown of certain pollutants in aquatic environments. Evidence is presented that nitrate, iron species, and peroxides may be responsible for sunlight-initiated free radical oxidations of pollutants in some natural waters.
    Notes: Zusammenfassung Um kinetische Daten über den Einfluß von Sonnenlicht auf das Verhalten von Verunreinigungen in Seen und Flüssen zu erhalten, wurden licht-induzierte Umwandlungsreaktionen von organischen Chemikalien untersucht. Es ergab sich, daß die Humuskomponente der in natürlichen Wässern gelösten organischen Substanzen auf zwei Arten die aquatischen Photoreaktionen beeinflußt. durch Schwächung des Sonnenlichtes und durch Sensibilisierung der Photoreaktionen. Humus-sensibilisierte Photoreaktionen von Furanen, Sulfiden, Dienen, nitroaromatischen Verbindungen u.a. werden diskutiert. Ein Überblick wird gegeben über die Wirkung aquatischer Partikel auf die Geschwindigkeit der Photoreaktion von Verunreinigungen. Suspendierte Sedimente wirken hauptsächlich durch Lichtabschwächung und Streuung auf die Photolysegeschwindigkeit. Algen, Diatomeen und Bakterien beschleunigen lichtinduzierte Umwandlungen von Anilinen und Phosphorthioat-Insecticiden, was darauf hindeutet, daß photobiologische Prozesse eine bedeutende Rolle beim Abbau gewisser Verunreinigungen in aquatischer Umgebung spielen könnten. Es wird gezeigt, daß Nitrat, Eisenverbindungen und Peroxide für die Sonnenlicht-induzierte Oxidation freier Radikale von Verunreinigungen in natürlichen Wässern verantwortlich sein können.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00584672
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  • 18
    Electronic Resource
    Electronic Resource
    Synthesis of transparent fluorocarbon elastomers: Effect of crosslinker type and electron beam irradiation level on physical and mechanical behavior (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 957-968 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Saturated fluorocarbon elastomers are very resistant to chemical reactions, including those of a crosslinking nature. In order to study proper methods of preparing these materials, Viton GLT was mixed with various levels of trimethylol propane trimethacrylate, TMPTM, and triallyl isocyanurate, Diak #7. After molding, the materials were subjected to electron beam irradiation. The glass transition, rubbery modulus, viscoelastic behavior, and equilibrium swelling were used to characterize the materials as a function of crosslinker and irradiation level. In general, the modulus and gel fraction increased with both crosslinker content and irradiation level. Mixtures of both crosslinking monomers produced an unexpected synergism, yielding higher tensile strength, and earlier onset of gelation.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070270315
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  • 19
    Electronic Resource
    Electronic Resource
    Crosslinking of fluorocarbon elastomers: Characterization of crosslinking system to obtain transparent, tough materials (1982)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 22 (1982), S. 478-483 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Viton® GLT is a new low-temperature fluoroelastomer with a Tg near -40°C. A study was made on methods of Crosslinking this material while retaining its transparency. Combinations of trimethylolpropane trimethacrylate, TMPTM, and triallyl isocyanurate, Diak® #7, were milled into Viton GLT. After molding, the materials were exposed to electron-irradiation, cross-linking the material. Transparent, tough materials were obtained for compositions containing about 3 percent TMPTM/3 percent Diak #7/3 Mrads, which had an extension of over 100 percent, a tensile strength of over 1000 PSI, excellent clarity, and low surface tack.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760220805
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  • 20
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    Unknown
    Identification of a rare Epstein-Barr virus variant that enhances early antigen expression in Raji cells. (1983)
    National Academy of Sciences
    Details
    Publication Date: 1983-05-01
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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