Genotype Dependence
Mostrando 13-24 de 28 artigos, teses e dissertações.
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13. Transformation in Agmenellum quadruplicatum
A DNA-mediated transformation system for the blue-green alga Agmenellum quadruplicatum, strain PR-6, is described and characterized for DNA concentration dependence, dependence on time of exposure to DNA, phenotypic expression, sensitivity to various enzymes, and competence. The stability of the transformants has been investigated, and genetic backcross and
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14. Genetic Heterogeneities and Phenotypic Characteristics of Strains of the Genus Abiotrophia and Proposal of Abiotrophia para-adiacens sp. nov.
The genus Abiotrophia represents a heterogeneous group of fastidious cocci that show a dependence on pyridoxal hydrochloride analogs for growth. The genetic heterogeneity in the genus Abiotrophia was examined by DNA-DNA hybridization, PCR assay of genomic DNA sequences, and restriction fragment length polymorphism and sequence homology analyses of the PCR-am
American Society for Microbiology.
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15. Enzyme Polymorphism and Cyclic Parthenogenesis in DAPHNIA MAGNA. I. Selection and Clonal Diversity
Genotype frequencies and fecundities were recorded over a period of two years for three polymorphic enzyme loci (Est, Mdh and Got) in a parthenogenetic natural population of Daphnia magna Straus (Crustacea: Cladocera). There was a large excess of heterozygotes at each locus, and some nonrandom association between loci, although 29 different three-locus genot
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16. ATRIUM: Testing Untyped SNPs in Case-Control Association Studies with Related Individuals
In genome-wide association studies, only a subset of all genomic variants are typed by current, high-throughput, SNP-genotyping platforms. However, many of the untyped variants can be well predicted from typed variants, with linkage disequilibrium (LD) information among typed and untyped variants available from an external reference panel such as HapMap. Inc
Elsevier.
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17. Modes of Selection Maintaining an Inversion Polymorphism in DROSOPHILA PAULISTORUM
The possibility that fitness relationships associated with an inversion polymorphism in D. paulistorum were frequency dependent was investigated. Using allozymes of tetrazolium oxidase to mark inversions, the effects of genotype frequency, larval density, and culture conditions on fitness were assessed. The proportions of genotypes among egg-laying females w
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18. Expression of the Pseudomonas syringae avirulence protein AvrB in plant cells alleviates its dependence on the hypersensitive response and pathogenicity (Hrp) secretion system in eliciting genotype-specific hypersensitive cell death.
The nonpathogenic bacteria Pseudomonas fluorescens and Escherichia coli can elicit a genotype-specific hypersensitive response (HR) in plants if they express both the HR and pathogenesis (Hrp) protein secretion system and the HrpZ harpin from P. syringae pv syringae 61 and a P. syringae avirulence (avr) gene whose presence is recognized by a corresponding di
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19. Genotype Dependence of Hepatitis C Virus Load Measurement in Commercially Available Quantitative Assays
Standardization and genotype independence of methods used to quantify hepatitis C virus (HCV) RNA in clinical specimens are necessary for accurate assessment of the role of HCV quantitation as a prognostic marker for HCV infection and monitoring of the response to antiviral treatment. Commercially available methods used to measure HCV loads include PCR-based
American Society for Microbiology.
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20. Molecular Cloning of the uhp Region and Evidence for a Positive Activator for Expression of the Hexose Phosphate Transport System of Escherichia coli
The uhp locus of Escherichia coli contains genes for the sugar phosphate transport system (uhpT) and the regulatory system which allows its induction by external glucose 6-phosphate (uhpRA). The uhp region was cloned onto high-copy-number plasmids, both from Uhp+ plasmids of the Clarke-Carbon collection and from genetically characterized specialized transduc
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21. Marker-Based Inferences about Epistasis for Genes Influencing Inbreeding Depression
We describe a multilocus, marker-based regression method for inferring interactions between genes controlling inbreeding depression in self-fertile organisms. It is based upon selfing a parent heterozygous for several unlinked codominant markers, then analyzing the fitness of progeny marker genotypes. If loci causing inbreeding depression are linked to marke
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22. Interactions between quantitative trait loci in soybean in which trait variation at one locus is conditional upon a specific allele at another.
A large recombinant inbred population of soybean has been characterized for 220 restriction fragment-length polymorphism (RFLP) markers. Values for agronomic traits also have been measured. Quantitative trait loci (QTL) for height, yield, and maturity were located by their linkage to RFLP markers. QTL controlling large amounts of trait variation were analyze
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23. Genotype-Environment Interaction: Apolipoprotein E (Apoe) Gene Effects and Age as an Index of Time and Spatial Context in the Human
We analyzed the age-dependence of the estimates of the parameters of the genetic architecture of plasma ApoE levels associated with ApoE gene variation. Our study sample included 1988 individuals in multigeneration pedigrees from the Rochester, MN, population. We used a 30-yr sliding window across the age range (5-90 yr) to estimate the age dependency of par
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24. The Effects of Genotypic Frequency and Population Density on Fitness Differentials in ESCHERICHIA COLI
Two strains of Escherichia coli K-12, a lac + wild type and a lac- auxotroph, were grown both as pure and mixed cultures, using a serial transfer procedure. Four different growth media were employed, consisting of the same minimal salts solution, but different total concentrations of the sugars lactose, arabinose, and glucose (in proportions 5:4:1). Populati