15,739 Result(s)
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Article
Human pituitary growth hormone
Aus Tierexperimenten mit Wachstumshormonen aus Rindern wird klar, dass das Hormon eine Anzahl anderer biologischer Funktionen ausübt als seine wachstumsfördernde Tätigkeit. Im Menschen hat sich das Wachstumsho...
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A phylogenetic comparison of mutation spectra
Spectra of induced mutations resulting in obligate organoauxotrophy are compared at different phylogenetic levels from bacteria to higher plants. It appears that the spectra of mutants concerned with basic cel...
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Human chorionic somato-mammotropin (HCS), proposed terminology for designation of a placental hormone
Es wird vorgeschlagen, dass das von verschiedenen Forschern als «human placental lactogen», «chorionic growth hormone prolactin», «purified placental protein (human)» usw. bezeichnete plazentare Hormon «chorio...
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Direct evidence for models of heterosis provided by mutants of Arabidopsis blocked in the thiamine pathway
Auxotrophic mutants genetically blocked at different steps of the thiamine pathway dramatically demonstrate the biochemical mechanism of hybrid vigor due to simple and perfect dominance at two unlinked loci. H...
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Sequence comparison of human pituitary growth hormone, human chorionic somatomammotropin and ovine pituitary lactogenic hormone
Ein Vergleich der Aminosäuresequenzen von menschlichen Wachstumshormonen und menschlichem Chorion-Somatomammotropin mit denjenigen von Prolactin zeigt, dass 26% des Rückstandes in allen drei Molekülen die glei...
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Influence of glass microbeads on growth, activity and morphological changes of Bacillus megaterium
Cells of Bacillus megaterium growing in the presence of glass microbeads with average diameters of 29 and 53 μm were frequently filamentous and sometimes reached lengths of 600 μm. Some of the filaments were nons...
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The effect of isoniazid on human chromosomes studied by a new method
Nachweis, dass die Bindung von tritiummarkiertem Poly-l-Lysin (3H-PL), mit den Chromosomen der A-Gruppe (speziell mit dem A2-Chromosom) aus isoniazidhaltigen Kulturen der menschlichen Lymphocyten isoliert, versch...
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Kinetics of tracer flows and isotope interaction in an ion exchange membrane
The thermodynamic formulation of isotope interaction (coupling of abundant and tracer isotope flows) has been tested in a highly permselective anion exchange membrane in the absence of significant electroosmos...
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Tracer flow, permeability, and partial conductance
It is often not possible to evaluate a permeability coefficient for net flowP from the small flows produced by physiological gradients of concentration or electrical potential. The common use of a tracer permeabi...
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A virus-specified mechanism for the prevention of multiple infection—T7- and T3-mutual and superinfection exclusion
Co-and superinfection of cells with T3/T7 result in exclusion (mutual or superinfection exclusion). The exclusion mechanism is also directed against homologous (or identical) virus. Exclusion is established af...
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E. coli membranes become permeable to ions following T7-virus-infection
Infection of E. coli with the viruses T7 or T3 leads to a dramatic efflux of potassium ions. This ion efflux is caused by the virus particle since no concomitant protein synthesis is required. T7 mutants carrying...
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Influence of membrane heterogeneity on kinetics of nonelectrolyte tracer flows
In a composite membrane with heterogeneous channels, prevention of net volume flow with hydrostatic pressure differences and/or impermeant osmotic solutes may induce positive isotope interaction (coupling of i...
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Plant tissue culture media: Major constitutents, their preparation and some applications
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Effects of Ag+ on frog skin: Interactions with oxytocin, amiloride and ouabain
Different biological effects of Ag+ (10−4 M) were found depending on its presence in the outer or the inner solution bathing the frog skin. A marked increase in the electrical conductance and an interference with...
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Purification and characterization of seed storage proteins from Momordica charantia
2 storage proteins have been isolated and purified from seeds of Momordica charantia. These proteins appear to consist of 4 subunits of 5500 daltons and they contain a very high concentration of glutamic acid ...
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On the state of anionic groups of demineralized matrices of bone and dentine
Calcium-binding and biochemical studies have been applied to characterize the state of the carboxylate and protein-bound phosphate groups in the EDTA-demineralized matrices of rat bone and dentine. The organic...
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Dynamic properties of polyelectrolyte calcium membranes
Shashoua observed spontaneous oscillations in a polyelectrolyte membrane formed by interfacial precipitates of polyacid and polybase. We have here undertaken experimental and theoretical studies of polyglutami...
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Early T7 gene expression
The mode of transcription of early T7 genes starting from one promotor region and generating a unique polycistronic RNA species suggests the appearance of equimolar amounts of the monocistronic species after R...
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Effect of variations in temperature on antimuscarinic activity in guinea-pig atria
The characteristics of the antimuscarinic activity of homatropine, gallamine and stercuronium in guinea-pig atria remained constant over the temperature range 22–37°C in that a linear Arunlakshana-Schild plot ...
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The half-life of mRNA in Saccharomyces cerevisiae
The decay kinetics of mRNA was studied in a yeast temperature-sensitive mutant, ts136, which is defective in cytoplasmic RNA production at 37° C. The disappearance of the synthetic capacity of mRNA was determined...
