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  • Articles  (27)
  • 1975-1979  (27)
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  • 1
    Electronic Resource
    Electronic Resource
    Novel approach to micro infrared sample preparation (1975)
    s.l. : American Chemical Society
    Analytical chemistry 47 (1975), S. 2482-2483 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60364a033
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence for denitrification in aerobic pelagic sediments (1978)
    [s.l.] : Nature Publishing Group
    Nature 274 (1978), S. 354-356 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Data on the dissolved oxygen and nitrogen content of pelagic sediments have hitherto not been available, although results from some near-shore environments have been reported4. There are considerable difficulties in sampling deep-sea sedimentary pore waters for dissolved gases and in analysing the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/274354a0
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  • 3
    Electronic Resource
    Electronic Resource
    Isolation and characterization of pteridines from heads of Drosophila melanogaster by a modified thin-layer chromatography procedure (1977)
    Springer
    Biochemical genetics 15 (1977), S. 307-319 
    Details
    ISSN: 1573-4927
    Keywords: pteridines ; Drosophila ; thin-layer chromatography ; eye pigments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract An improved thin-layer chromatography technique is described for the separation of fluorescent compounds found in extracts of heads of Drosophila melanogaster. Eighteen to twenty fluorescent spots are resolved, two of which are xanthurenic acid and 3-hydroxykynurenine, and the remaining spots are presumably pteridines. Of these, nine have been identified and quantitated directly on the chromatograms with a fluorometer. One of the spots present on the chromatogram apparently has not been described previous to this work. Characteristics of this substance, termed “quench spot,” are presented, several of which indicate that it may be a pteridine or pteridine derivative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484462
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  • 4
    Electronic Resource
    Electronic Resource
    Mechanism of suppression in Drosophila. V. Localization of the purple mutant of Drosophila melanogaster in the pteridine biosynthetic pathway (1977)
    Springer
    Biochemical genetics 15 (1977), S. 321-332 
    Details
    ISSN: 1573-4927
    Keywords: pteridines ; Drosophila ; suppression ; eye color mutants ; GTP ; development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The suppressible eye color mutant purple (pr) of Drosophila melanogaster is known to be unable to synthesize a wild-type complement of pteridine eye pigments. This study measures the reduced levels of drosopterins, sepiapterin, and an unidentified presumed pteridine in pr and pr bw. Pteridine analyses in double mutants combining pr with one of three other eye color mutants sepia, Henna-recessive3, and prune2, suggest that the metabolic block in pr occurs prior to sepiapterin biosynthesis. Measurements of GTP and GTP cyclohydrolase in pr showed wild-type levels and indicate the metabolic block in pr to be at one of the steps converting dihydroneopterin triphosphate to sepiapterin. Quantitation of pteridines in suppressed purple [su(s) 2; pr and pr; su(pr) e3] shows restoration of pteridines to wild-type or nearly wild-type levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484463
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  • 5
    Electronic Resource
    Electronic Resource
    ATP synthesis driven by a protonmotive force inStreptococcus lactis (1975)
    Springer
    The journal of membrane biology 25 (1975), S. 285-310 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary An electrochemical potential difference for hydrogen ions (a protonmotive force) was artificially imposed across the membrane of the anaerobic bacteriumStreptococcus lactis. When cells were exposed to the ionophore, valinomycin, the electrical gradient was established by a potassium diffusion potential. A chemical gradient of protons was established by manipulating the transmembrane pH gradient. When the protonmotive force attained a value of 215 mV or greater, net ATP synthesis was catalyzed by the membrane-bound Ca++, Mg++-stimulated ATPase. This was true whether the protonmotive force was dominated by the membrane potential (negative inside) or the pH gradient (alkaline inside). Under these conditions, ATP synthesis could be blocked by the ATPase inhibitor, dicyclohexylcarbodiimide, or by ionophores which rendered the membrane specifically permeable to protons. These observations provide strong evidence in support of the chemiosmotic hypothesis, which states that the membrane-bound ATPase couples the inward movement of protons to the synthesis of ATP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01868580
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  • 6
    Electronic Resource
    Electronic Resource
    A protonmotive force as the source of energy for galactoside transport in energy depletedEscherichia Coli (1977)
    Springer
    The journal of membrane biology 31 (1977), S. 233-255 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary An artificially produced electrochemical potential difference for protons (protonmotive force) provided the energy for the transport of galactosides inEscherichia coli cells which were depleted of their endogenous energy reserves. The driving force for the entry of protons was provided by either a transmembrane pH gradient or a membrane potential. The pH gradient across the membrane was created by acidifying the external medium. The membrane potential (inside negative) was established by the outward diffusion of potassium (in the presence of valinomycin) or by the inward diffusion of the permeant thiocyanate ion. The magnitude of the electrochemical potential difference for protons agreed well with magnitude of the chemical potential difference of the lactose analog, thiomethylgalactoside. The observations are consistent with the view that the carrier-mediated entry of each galactoside molecule is accompanied by the entry of one proton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01869407
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of lithium ion on melibiose transport inEscherichia coli (1978)
    Springer
    The journal of membrane biology 42 (1978), S. 45-59 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Both Li+ and Na+ stimulated the uptake of thiomethylgalactoside by the melibiose transport system ofEscherichia coli. On the other hand, Li+ inhibited the growth of cells on melibiose as a sole source of carbon. This inhibition was specific for melibiose, and Li+ had no effect on growth of cells on glucose, galactose, lactose, or glycerol. The effect of the cation on melibiose transport was investigated in a mutant which cannot utilize glucose. After entry into this cell, melibiose is cleaved into glucose and galactose by α-galactosidase, and the resulting glucose is excreted. Since the entry step was found to be rate-limiting, glucose production could be taken as a measure of melibiose transport. Li+ inhibited the transport of melibiose, but not the induction of the melibiose operon nor the activity of α-galactosidase. Li+ was found to inhibit the entry ofp-nitrophenyl-α-d-galactoside, but notp-nitrophenyl-β-d-galactoside entry. Thus, the cation specificity for the melibiose membrane carrier varies with different transport substrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01870393
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  • 8
    Electronic Resource
    Electronic Resource
    Comparison of dislocation images obtained using the scanning optical microscope and scanning electron microscope (1979)
    Springer
    Journal of materials science 14 (1979), S. 961-965 
    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 Dislocations in a silicon specimen containing a p-n junction have been imaged with a scanning optical microscope (SOM) and a scanning electron microscope (SEM) using the induced carrier mode. Examination of the same dislocations by the two methods has shown that virtually identical images are obtained and the spatial resolution is 1μm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00550728
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  • 9
    Electronic Resource
    Electronic Resource
    Low-molecular-weight species from high-pressure polyethylene (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 17 (1979), S. 2511-2527 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A partial analysis is given of the low-molecular-weight “oil” fraction produced in the high-pressure free-radical-initiated polymerization of ethylene. These oils are shown to constitute a separate family of compounds whose molecular weight distribution can be clearly distinguished from that of the remainder of the polymer. The mechanisms of formation of oils as a class, and of individual compounds found in the oil fraction, are discussed in some detail. The structures of the oils are used to inter steps in the mechanism of polymerization that lead to the formation of short-chain branches and unsaturation. It is concluded that the data are consistent with the extended Roedel mechanism with the provisions that (1) secondary radicals are probable products of radical scission, (2) cyclic intermediates of other than six members lead to the formation of three, five, and possibly six carbon branches, and (3) clusters of ethyl groups separated by single methylene groups are unlikely side chains.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.170170824
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  • 10
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    Unknown
    Biological properties of poliovirus encapsulated in lipid vesicles: antibody resistance and infectivity in virus-resistant cells. (1977)
    National Academy of Sciences
    Details
    Publication Date: 1977-08-01
    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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