Extreme West
Mostrando 13-19 de 19 artigos, teses e dissertações.
-
13. Cloning and characterization of the extreme 5′-terminal sequences of the RNA genomes of GB virus C/hepatitis G virus
The extreme 5′-terminal sequences of the GB virus C/hepatitis G virus (GBV-C/HGV), containing elements essential for regulation of viral gene expression and replication, have not been determined. By using a RNA-ligase-mediated RACE (rapid amplification of the cDNA ends) procedure, we have cloned the extreme 5′-terminal sequences of the viral genome from
The National Academy of Sciences of the USA.
-
14. Reduced Y-Chromosome, but Not Mitochondrial DNA, Diversity in Human Populations from West New Guinea
To investigate the paternal population history of New Guinea, 183 individuals from 11 regional populations of West New Guinea (WNG) and 131 individuals from Papua New Guinea (PNG) were analyzed at 26 binary markers and seven short-tandem-repeat loci from the nonrecombining part of the human Y chromosome and were compared with 14 populations of eastern and so
The American Society of Human Genetics.
-
15. Alternative adaptations, speciation, and phylogeny (A Review)
Alternative adaptations—different adaptive phenotypes maintained in the same life stage and the same population but not necessarily simultaneously expressed in the same individual—represent contrasting character sets produced by the same genome, in effect allowing a single species to occupy more than one sympatric niche. Such alternatives are particularl
-
16. Variations in frequencies of drug resistance in Plasmodium falciparum
Continual exposure of malarial parasite populations to different drugs may have selected not only for resistance to individual drugs but also for genetic traits that favor initiation of resistance to novel unrelated antimalarials. To test this hypothesis, different Plasmodium falciparum clones having varying numbers of preexisting resistance mechanisms were
The National Academy of Sciences of the USA.
-
17. Giant plasmid-encoded polyketide synthases produce the macrolide toxin of Mycobacterium ulcerans
Mycobacterium ulcerans (MU), an emerging human pathogen harbored by aquatic insects, is the causative agent of Buruli ulcer, a devastating skin disease rife throughout Central and West Africa. Mycolactone, an unusual macrolide with cytotoxic and immunosuppressive properties, is responsible for the massive s.c. tissue destruction seen in Buruli ulcer. Here, w
National Academy of Sciences.
-
18. Response of C3 and C4 plants to middle-Holocene climatic variation near the prairie–forest ecotone of Minnesota
Paleorecords of the middle Holocene (MH) from the North American mid-continent can offer insights into ecological responses to pervasive drought that may accompany future climatic warming. We analyzed MH sediments from West Olaf Lake (WOL) and Steel Lake (SL) in Minnesota to examine the effects of warm/dry climatic conditions on prairie–woodland ecosystems
National Academy of Sciences.
-
19. Patterns of Gene Variation in Central and Marginal Populations of DROSOPHILA ROBUSTA
The central and marginal populations of D. robusta differ greatly in the level of inversion polymorphism; the marginal populations are monomorphic or nearly so and the central populations are highly polymorphic. This paper presents the frequencies of alleles at forty gene loci in various populations of D. robusta, studied by electrophoresis of proteins and e