منابع مشابه
Effects of altered temperature and precipitation on desert protozoa associated with biological soil crusts.
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...
متن کاملRole of Pore Size Location in Determining Bacterial Activity during Predation by Protozoa in Soil.
The predation of a luminescence-marked strain of Pseudomonas fluorescens by the soil ciliate Colpoda steinii was studied in soil microcosms. Bacterial cells were introduced in either small (neck diameter, <6 (mu)m) or intermediate-sized (neck diameter, 6 to 30 (mu)m) pores in the soil by inoculation at appropriate matric potentials, and ciliates were introduced into large pores (neck diameter, ...
متن کاملAccurate enumeration and identification of Testacea (Protozoa, Rhizopoda) in forest soil using scanning electron microscopy.
A new procedure is used for separating Testacea from soil, based on dispersion, sequential centrifugation settling, and subsequent filtration of the soil suspension. Combined with scanning electron microscopy (SEM), this procedure allows accurate enumeration of Testacea, with a recovery rate of 90% and more precise counting (relative standard deviation, RSD: 5%) of Testacea than in previous works.
متن کاملProtozoa as agents responsible for the decline of Xanthomonas campestris in soil.
A streptomycin-resistant mutant of Xanthomonas campestris was used to assess the persistence of the plant pathogen in soil and the changes in populations that might be important for its survival. In soil into which large numbers of the organism were introduced, a marked decline in its abundance occurred, but after about 1 week its population density reached a level of about 105 and did not con...
متن کاملPhosphagen and Protozoa
THE comparative investigations of Eggleton and Eggletonw, Meyerhof and Lohmanndi), Meyerhof (io), and Needham, Needham, Baldwin and Yudkin (n) have established a considerable body of information concerning the distribution of the phosphagens in the animal kingdom, and the character and implications of this knowledge have recently been analysed by Needham and Needham (13). But from all discussio...
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ژورنال
عنوان ژورنال: Nature
سال: 1914
ISSN: 0028-0836,1476-4687
DOI: 10.1038/092632c0