Culturable Bacteria
Mostrando 25-36 de 145 artigos, teses e dissertações.
-
25. Molecular Phylogenetic and Biogeochemical Studies of Sulfate-Reducing Bacteria in the Rhizosphere of Spartina alterniflora
The population composition and biogeochemistry of sulfate-reducing bacteria (SRB) in the rhizosphere of the marsh grass Spartina alterniflora was investigated over two growing seasons by molecular probing, enumerations of culturable SRB, and measurements of SO42− reduction rates and geochemical parameters. SO42− reduction was rapid in marsh sediments wit
American Society for Microbiology.
-
26. Response of marine bacterioplankton to differential filtration and confinement.
The bacterioplankton community of confined seawater at 25 degrees C changed significantly within 16 h of collection. Confinement increased CFU, total cell number (by epifluorescence microscopy), and average cell volume of bacterioplankton and increased the turnover rate of amino acids in seawater sampled at Frying Pan Shoals, N.C. The bacterioplankton commun
-
27. Fecal Microflora in Healthy Persons in a Preindustrial Region
Procedures for quantitating the fecal microflora of man were described. Special attention was given to criteria for characterizing the culturable aerobic, Micro-aerophilic, and anaerobic bacteria. Three groups of healthy persons were studied: wholly breast—fed infants (2 to 4 month-olds), weanlings (1 to 2 year-olds), and adults. In breast-fed children, bi
-
28. Succession of Pelagic Marine Bacteria during Enrichment: a Close Look at Cultivation-Induced Shifts
Enrichment experiments with North Sea bacterioplankton were performed to test if rapid incubation-induced changes in community structure explain the frequent isolation of members of a few particular bacterial lineages or if readily culturable bacteria are common in the plankton but in a state of dormancy. A metabolic inhibitor of cell division (nalidixic aci
American Society for Microbiology.
-
29. Effects of Pharmaceutical Wastes on Microbial Populations in Surface Waters at the Puerto Rico Dump Site in the Atlantic Ocean
A series of cruises during 1979 and 1980 to the pharmaceutical dump site located 64 km north of Arecibo, Puerto Rico, in the Atlantic Ocean, was carried out to evaluate effects of wastes on the ecology of the microflora of surface waters of the dump site. In addition to bacteriological monitoring of the waste plume created by the release of wastes from the d
-
30. Examination of Methods for Enumerating Hemicellulose-Utilizing Bacteria in the Rumen
Counts of colonies that developed after 4 days on agar medium containing 0.3% xylan and preincubated rumen fluid were similar to counts of xylanolytic bacteria obtained when total culturable counts were multiplied by the percentage of isolates capable of producing acid from xylan. Shortening the incubation period reduced the chance of including satellite col
-
31. Inclusion of xylan in a medium for the enumeration of total culturable rumen bacteria.
The influence of the inclusion of xylan in a medium for enumeration of total culturable rumen bacteria was investigated. Maximum colony numbers were obtained on a medium, GCSX-2, which contained 0.033% each glucose and cellobiose and 0.067% each soluble starch and xylan. This medium gave higher colony counts than either medium 98-5 of Bryant and Robinson (J.
-
32. Luminescence-based detection of activity of starved and viable but nonculturable bacteria.
A naturally luminescent bacterium, Vibrio harveyi, and two bacteria, Escherichia coli and Pseudomonas fluorescens, which had been genetically marked with luminescence were starved in liquid medium at 4 and 30 degrees C for 54 days. Total cell concentrations and concentrations of culturable and viable cells were determined by acridine orange staining, dilutio
-
33. Fate of Enterobacter cloacae JP120 and Alcaligenes eutrophus AEO106(pRO101) in soil during water stress: effects on culturability and viability.
A sandy loam soil near field capacity moisture content (psi = -0.050 MPa) or air dried (psi = -300 MPa) was inoculated with about 3 x 10(7) CFU of Enterobacter cloacae JP120 and Alcaligenes eutrophus AEO106(pRO101) per g and incubated in 40-g portions at 17 degrees C in closed or open Erlenmeyer flasks. In the field-moist soil, selective plating, direct viab
-
34. Culturable Populations of Sporomusa spp. and Desulfovibrio spp. in the Anoxic Bulk Soil of Flooded Rice Microcosms
Most-probable-number (MPN) counts were made of homoacetogenic and other bacteria present in the anoxic flooded bulk soil of laboratory microcosms containing 90- to 95-day-old rice plants. MPN counts with substrates known to be useful for the selective enrichment or the cultivation of homoacetogenic bacteria (betaine, ethylene glycol, 2,3-butanediol, and 3,4,
American Society for Microbiology.
-
35. Distribution of Vibrio vulnificus in the Chesapeake Bay.
Vibrio vulnificus is a potentially lethal human pathogen capable of producing septicemia in susceptible persons. Disease is almost always associated with consumption of seafood, particularly raw oysters, or with exposure of wounds to seawater. An oligonucleotide DNA probe (V. vulnificus alkaline phosphatase-labeled DNA probe [VVAP]), previously shown to be h
-
36. Cultivation-Dependent and -Independent Approaches for Determining Bacterial Diversity in Heavy-Metal-Contaminated Soil
In recent years, culture-independent methods have been used in preference to traditional isolation techniques for microbial community analysis. However, it is questionable whether uncultured organisms from a given sample are important for determining the impact of anthropogenic stress on indigenous communities. To investigate this, soil samples were taken fr
American Society for Microbiology.