28,542 Result(s)
-
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...
-
Article
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...
-
Article
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...
-
Article
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...
-
Article
Thiamine mutants of the crucifer, Arabidopsis
In higher plants the only obligate organoauxotrophic mutants available are concerned with the synthesis of thiamine, vitamin B1. In Arabidopsis 65 mutants, representing four loci controlling four different steps ...
-
Chapter
Separation of Hydrocarbons by Liquid Membrane Permeation
A novel separation technique based on selective permeation through liquid surfactant membrances for hydrocarbon separations is described. Some of the possible process schemes are discussed. The permeation and ...
-
Article
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...
-
Article
A study of genetic polymorphisms of milk β-lactoglobulin, αS1-casein, β-casein, and κ-casein in five dairy breeds
Gene frequencies of the milk β-lactoglobulin, αS1-casein, β-casein, and κ-casein loci have been estimated from 1663 cows of five dairy breeds. Departure from Hardy-Weinberg equilibrium was found only in the κ-cas...
-
Article
Stimulation and inhibition of membrane-dependent ATP synthesis in chloroplasts by artificially induced K+ gradients
The imposition of a potassium ion gradient simultaneous with a pH transition of Valinomycin treated spinach chloroplasts results in a modulation of ATP synthesis elicited by the acid-base transition. A gradien...
-
Article
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...
-
Article
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...
-
Article
Nucleotide sequence divergence among DNA fractions of different syngens of Tetrahymena pyriformis
The magnitude of the differences in base sequence of DNA fractions derived from different syngens of the ciliated protozoan Tetrahymena pyriformis was investigated. Each DNA was fractionated into unique and repea...
-
Article
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...
-
Chapter
Use of Isolated Membrane Vesicles in Transport Studies
Isolated membrane vesicles represent one of the simplest systems in which the transport processes remain intact and have therefore provided considerable information on the structure, function, and regulation o...
-
Article
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...
-
Article
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...
-
Article
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...
-
Article
Correlation between structural variation and activity of murine kidney β-galactosidase: Implications for genetic control
Two closely linked regulatory genes have been reported to control activity levels of β-galactosidases in murine tissues. The specific effects of these genes on murine glycolipid metabolism have not been elucid...
-
Article
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...
-
Article
Plant tissue culture media: Major constitutents, their preparation and some applications
