Temperate Zones
Mostrando 13-24 de 28 artigos, teses e dissertações.
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13. SANDY BEACH MORPHODYNAMICS AND MACROBENTHIC COMMUNITIES IN TEMPERATE, SUBTROPICAL AND TROPICAL REGIONS - A MACROECOLOGICAL APPROACH
A comprehensive study involving 52 microtidal beaches spanning from reflective to dissipative states and located in tropical, subtropical and temperate regions in the Atlantic, Pacific and Indian oceans was carried out to unravel the relative roles of latitude and beach morphodynamics in determining beach macrobenthic species richness, abundance, biomass and
Publicado em: 2003
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14. Migration and Species Diversity in the Tropics
If the young of a dominant species are subjected to disproportionately heavy predation, this, together with a limitation on food, can promote a high species diversity. This is seen among tropical birds, which are simultaneously exposed to both conditions to a far greater degree than are Temperate Zone species. Migration to the Temperate Zones during the spri
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15. Tropospheric concentrations of methylchloroform, CH3CCl3, in January 1978 and estimates of the atmospheric residence times for hydrohalocarbons
The ground level tropospheric concentrations of CH3CCl3 were measured from 55°N to 53°S during the time period around Jan. 1, 1978. The northern temperate zone concentration of CH3CCl3 averaged 94.6 ± 4.0 × 10-12 by volume. The southern temperate zone concentration averaged 65.2 ± 1.3 × 10-12, for a worldwide average of 80 × 10-12 by volume. The ratio
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16. Recombination-Deficient Mutants of Colicinogenic Salmonella typhimurium Detected by Their Failure to Produce Colicin
Survivors of nitrosoguanidine-treated cultures of a colicinogenic strain of Salmonella typhimurium were tested for spontaneous production of colicin E1. Of about 1,000 colonies tested, 13 produced no (or very narrow) colicin zones. Four of these isolates proved to be more sensitive to ultraviolet (UV) light, X rays, and methyl methane sulfonate than the pare
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17. Ecotypes of Planktonic Actinobacteria with Identical 16S rRNA Genes Adapted to Thermal Niches in Temperate, Subtropical, and Tropical Freshwater Habitats
Seven strains with identical 16S rRNA genes affiliated with the Luna2 cluster (Actinobacteria) were isolated from six freshwater habitats located in temperate (Austria and Australia), subtropical (People's Republic of China), and tropical (Uganda) climatic zones. The isolates had sequence differences at zero to five positions in a 2,310-nucleotide fragment o
American Society for Microbiology.
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18. Changing types of nephritogenic streptococci in Trinidad
The relation of seven different M types of streptococci to acute glomerulonephritis associated with skin lesions in South Trinidad has been studied by means of type-specific antibody assays as well as by isolation and identification of the strains. The data indicate that, one after another, five of these strains have prevailed among patients with acute glome
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19. Natural selection shaped regional mtDNA variation in humans
Human mtDNA shows striking regional variation, traditionally attributed to genetic drift. However, it is not easy to account for the fact that only two mtDNA lineages (M and N) left Africa to colonize Eurasia and that lineages A, C, D, and G show a 5-fold enrichment from central Asia to Siberia. As an alternative to drift, natural selection might have enrich
The National Academy of Sciences.
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20. Bradyrhizobium Populations Occur in Deep Soil under the Leguminous Tree Acacia albida
Soil cores were drilled under the leguminous tree Acacia albida growing in two different ecoclimatic zones of West Africa: the Sahelian area (100 to 500 mm of annual rainfall) and the Sudano-Guinean area (1,000 to 1,500 mm of annual rainfall). Soil samples were collected at different depths from the surface down to the water table level and analyzed for the
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21. Lysogenic Strains of Group N Lactic Streptococci
A temperate bacteriophage, designated r1t, was inducible from the group N lactic streptococcus, Streptococcus cremoris R1, by ultraviolet irradiation or mitomycin C treatment. Induced lysates produced plaques on lawns of three closely related S. cremoris strains, AM1, SK11, and US3. Strain SK11 was readily lysogenized. S. cremoris AM1 was the most reliable i
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22. Zoonotic Filariasis
Filariae of animals, especially those of mammals, often infect humans and typically produce cryptic infections. These “zoonotic” infections have been reported from virtually all parts of the world including temperate zones. Infections may be symptomatic or not, and the parasites are found in surgical tissue biopsy specimens or, more rarely, are removed i
American Society for Microbiology.
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23. Effect of Environmental Parameters on Bacterial Degradation of Bunker C Oil, Crude Oils, and Hydrocarbons
Mixed microbial cultures, previously enriched on Bunker C fuel oil, grew on and degraded Bunker C fuel oil at temperatures ranging from 5 to 28 C. At 15 C, 41 to 85% of the benzene-soluble components of Bunker C disappeared after incubation for 7 days; at 5 C the values ranged from 21 to 52% after 14 days of incubation. A Nocardia sp. isolated from a culture
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24. Genetic Variation and Geographic Differentiation in Mitochondrial DNA of the Horseshoe Crab, LIMULUS POLYPHEMUS
Restriction site variation in mitochondrial DNA (mtDNA) of the horseshoe crab (Limulus polyphemus) was surveyed in populations ranging from New Hampshire to the Gulf Coast of Florida. MtDNA clonal diversity was moderately high, particularly in southern samples, and a major genetic "break" (nucleotide sequence divergence approximately 2%) distinguished all sa