State Neutrality
Mostrando 25-34 de 34 artigos, teses e dissertações.
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25. Response experiments for nonlinear systems with application to reaction kinetics and genetics
A unified type of response experiment is suggested for complex systems made up of individual species (atoms, molecules, quasi-particles, biological organisms, etc.). We make the following assumptions: (i) some of the species may exist in two forms, labeled and unlabeled, respectively; (ii) the kinetic and transport properties of the labeled and unlabeled spe
National Academy of Sciences.
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26. Gene Actions Involved in Determining the Number of Ovarioles and Sternite Chaetae in Freshly Collected Strains of DROSOPHILA MELANOGASTER
The nature of gene action involved in the mode of determination of two quantitative traits of Drosophila melanogaster, e.g., number of ovarioles and sternite chaetae, was studied in freshly captured strains and their crosses, using the biomodel built up by Cockerman and Weir. The results proved to be similar to those obtained with laboratory populations. Th
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27. A Population Genetic Study of the Evolution of Sines. I. Polymorphism with Regard to the Presence or Absence of an Element
SINEs are short interspersed repeated DNA elements which are considered to spread throughout genomes via RNA intermediates. Polymorphisms with regard to the presence or absence of SINE are occasionally observed in a specific location of a genome. We modeled the evolution of SINEs with regard to this type of polymorphism. Because SINEs are rarely deleted, mul
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28. Methanogenesis from Ethanol by Defined Mixed Continuous Cultures
Methanogenesis from ethanol by defined mixed continuous cultures was studied. Under sulfate-free conditions, a Desulfovibrio strain was used as the ethanol-degrading species producing acetic acid and hydrogen. In a two-membered mutualistic coculture, the hydrogen was converted to methane by a Methanobacterium sp. and pH was maintained at neutrality by the ad
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29. Effect of Method of Preparation on the States of Chlorophyll in Euglena Chloroplast Fragments as Determined by Fluorescence Spectroscopy
The state of chlorophyll in chloroplast fragments is affected by such factors as the ionic strength and pH of the suspending medium. With increasing ionic strength or at pH values other than neutrality, there is a decrease in the fluorescence yield of the form of chlorophyll with fluorescence maximum at 715 to 736 mμ (aggregate) and an increase in the yield
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30. A Study on a Nearly Neutral Mutation Model in Finite Populations
As a nearly neutral mutation model, the house-of-cards model is studied in finite populations using computer simulations. The distribution of the mutant effect is assumed to be normal. The behavior is mainly determined by the product of the population size, N, and the standard deviation, σ, of the distribution of the mutant effect. If 4Nσ is large compared
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31. Effect of starvation on cytoplasmic pH, proton motive force, and viability of an acidophilic bacterium, Thiobacillus acidophilus.
The question of whether Thiobacillus acidophilus maintains its cytoplasmic pH at values close to neutrality by active or passive means was explored by subjecting the organism to long-term starvation (up to 22 days). Starving cells maintained a delta pH of 2 to 3 U throughout starvation, although cellular poly-beta-hydroxybutyric acid and ATP, the proton moti
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32. Simulation Studies on Electrophoretically Detectable Genetic Variability in a Finite Population
Using a new model of isoalleles, extensive Monte Carlo experiments were performed to examine the pattern of allelic distribution in a finite population. In this model it was assumed that the set of allelic states is represented by discrete points on a one-dimensional lattice and that change of state by mutation occurs in such a way that an allele moves eithe
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33. Studies of the aggregation of mutant proteins in vitro provide insights into the genetics of amyloid diseases
Protein aggregation and the formation of highly insoluble amyloid structures is associated with a range of debilitating human conditions, which include Alzheimer's disease, Parkinson's disease, and the Creutzfeldt–Jakob disease. Muscle acylphosphatase (AcP) has already provided significant insights into mutational changes that modulate amyloid formation. I
The National Academy of Sciences.
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34. 8-vinyl-deoxyadenosine, an alternative fluorescent nucleoside analog to 2′-deoxyribosyl-2-aminopurine with improved properties
We report here the synthesis and the spectroscopic characterization of 8-vinyl-deoxyadenosine (8vdA), a new fluorescent analog of deoxyadenosine. 8vdA was found to absorb and emit in the same wavelength range as 2′-deoxyribosyl-2-aminopurine (2AP), the most frequently used fluorescent nucleoside analog. Though the quantum yield of 8vdA is similar to that o
Oxford University Press.