We study the population inversion and Q-function of a two-level atom, interacting with single-mode laser light field, in a q-analog harmonic oscillator trap for increasing q. For τ = .003(q = e ) the collapses and revivals of popu∗email:[email protected] 1 lation inversion become well defined facilitating experimental observation but for large τ ∼ 0.1 the time dependence of populatio...

Biological soil crusts are diverse assemblages of bacteria, cyanobacteria, algae, fungi, lichens, and mosses that cover much of arid land soils. The objective of this study was to quantify protozoa associated with biological soil crusts and test the response of protozoa to increased temperature and precipitation as is predicted by some global climate models. Protozoa were more abundant when ass...

In the enrichment culture of the sulfur-oxidizing bacteria collected from an acid mine drainage, we have confirmed protozoa that belongs to Bodo edax. This paper describes an interaction between the bacteria and the protozoa in the presence of cupric ion. The SO42produced by the bacteria from S0 and the cell numbers of the bacteria and the protozoa were measured as a function of time in the cul...

a survey was carried out in seven villages around bandarabass, on persion gulf, to determine the prevalence of the intestinal protozoa infections. out of the 835 stool specimens examined, 676 samples were positive with single and multiple infections. the most prevalent of intestinal protozoa in bandarabass were entamoeba histolytica, entamoeba coli, giardia lambia and iodamoeba butschlii.

Ruminal samples were collected at slaughter from 364 unfasted steers fed different finishing diets to obtain information on numbers and species distribution of ciliated protozoa in feedlot cattle. Total numbers of protozoa averaged 1.59 X 10(5)/g of ruminal contents. A total of 47 steers (12.9%) were defaunated, but 4.1% of the steers possessed numbers of protozoa greater than 10(6)/g. Entodini...

Protozoa-associated methanogens (PAM) are considered one of the most active communities in the rumen methanogenesis. This experiment investigated whether methanogens are sequestrated within rumen protozoa, and structural differences between rumen free-living methanogens and PAM. Rumen protozoa were harvested from totally faunated sheep, and six protozoal fractions (plus free-living microorganis...

Despite recent advances in diagnostic technology, microscopic examination of stool specimens remains central to the diagnosis of most pathogenic intestinal protozoa. Microscopy is, however, labor-intensive and requires a skilled technologist. New, highly sensitive diagnostic methods have been developed for protozoa endemic to developed countries, including Giardia lamblia (syn. G. intestinalis/...

Five acidophilic protozoa (three flagellates, one ciliate and one amoeba) were isolated from acid mine water and a coal biotreatment plant, and grown in mixed cultures with acidophilic bacteria. Cultures were routinely maintained in ferrous sulphate media: in media containing pyrite or pyritic coal, protozoa grew in cultures containing coarse-grain (61-200 pm) but not fine-grain (c 61 pm) miner...