Feeding Enrichment
Mostrando 13-23 de 23 artigos, teses e dissertações.
-
13. Isolation and Characterization of Pyridoxine Auxotrophs of Escherichia coli1
Dempsey, Walter B. (University of Florida, Gainesville), and P. F. Pachler. Isolation and characterization of pyridoxine auxotrophs of Escherichia coli. J. Bacteriol. 91:642–645. 1966.—Pyridoxine auxotrophs of Escherichia coli B have been consistently produced by a modified penicillin enrichment method. This modified penicillin technique included a 6-hr
-
14. Group-Specific Monitoring of Phenol Hydroxylase Genes for a Functional Assessment of Phenol-Stimulated Trichloroethylene Bioremediation
The sequences of the largest subunit of bacterial multicomponent phenol hydroxylases (LmPHs) were compared. It was found that LmPHs formed three phylogenetic groups, I, II, and III, corresponding to three previously reported kinetic groups, low-Ks (the half-saturation constant in Haldane's equation for trichloroethylene [TCE]), moderate-Ks, and high-Ks group
American Society for Microbiology.
-
15. Reductive dechlorination of Tri- and tetrachloroethylenes depends on transition from aerobic to anaerobic conditions.
Aerobic enrichment cultures from contaminated groundwaters dechlorinated trichloroethylene (TCE) (14.6 mg/liter; 111 mumol/liter) and tetrachloroethylene (PCE) (16.2 mg/liter; 98 mumol/liter) reductively within 4 days after the transition from aerobic to anaerobic conditions. The transformation products were equimolar amounts of cis-1,2-dichloroethylene and
-
16. Incorporation of Label from 13C-, 2H-, and 15N-Labeled Methionine Molecules during the Biosynthesis of 2[prime]-Deoxymugineic Acid in Roots of Wheat.
The biosynthetic pathway of 2[prime]-deoxymugineic acid, a key phytosiderophore, was investigated by feeding 13C-, 2H-, and 15N-labeled methionine, the first precursor, to the roots of hydroponically cultured wheat (Triticum aestivum L. cv Minori). The incorporation of label from each methionine species was observed during their conversion to 2[prime]-deoxym
-
17. Resource edibility and trophic exploitation in an old-field food web.
I tested a food web model that predicts how environmental productivity (nutrient supply) and top carnivores should mediate interactions among herbivores, edible plants, and plants that are resistant to herbivory because they possess anti-herbivore defenses. Feeding trials with the dominant grasshopper herbivore at the study site confirmed that certain plant
-
18. Regulation of Bacterioplankton Production and Cell Volume in a Eutrophic Estuary †
During three periods of 16 to 25 days, bacterioplankton production, bacterial cell volume, chlorophyll a, CO2 assimilation, and particulate organic carbon were measured in enclosures situated in the eutrophic estuary Roskilde Fjord, Denmark. The enclosures were manipulated with respect to sediment contact and contents of inorganic nutrients, planktivorous fi
-
19. Isolation and Characterization of a Thermotolerant Methanol-Utilizing Yeast
A yeast capable of growth on methanol as its sole carbon-energy source was isoalted from soil samples and identified as a strain of Hansenula polymorpha. A continuous enrichment culture at 37 C with a simple mineral salts medium was used to select this organism. The isolate, designated DL-1, has a maximal specific growth rate of 0.22 per h, at pH 4.5 to 5.5
-
20. Predator-Specific Enrichment of Actinobacteria from a Cosmopolitan Freshwater Clade in Mixed Continuous Culture
We investigated whether individual populations of freshwater bacteria in mixed experimental communities may exhibit specific responses to the presence of different bacterivorous protists. In two successive experiments, a two-stage continuous cultivation system was inoculated with nonaxenic batch cultures of the cryptophyte Cryptomonas sp. Algal exudates prov
American Society for Microbiology.
-
21. Measurement of very low density and low density lipoprotein apolipoprotein (Apo) B-100 and high density lipoprotein Apo A-I production in human subjects using deuterated leucine. Effect of fasting and feeding.
Six normolipidemic male subjects, after an 8-h overnight fast, were given a bolus injection and then a 15-h constant intravenous infusion of [D3]L-leucine. Subjects were studied in the fasted state and on a second occasion in the fed state (small, physiological meals were given every hour for 15 h). Apolipoproteins were isolated by preparative gradient gel e
-
22. Observations on the factors that control the generation of triiodothyronine from thyroxine in rat liver and the nature of the defect induced by fasting.
Studies were performed to explore the mechanism underlying the impaired generation of 125-I-3,5,3'-triiodothyronine (T3) from 125I-thyroxine (T4) (T3-neogenesis)) in preparations of liver from rats fasted for 48 h and the prevention of this effect by the feeding of glucose. T3-neogenesis in livers from fasted animals and those fed chow or glucose was assesse
-
23. Immunologic effects of national cholesterol education panel step-2 diets with and without fish-derived N-3 fatty acid enrichment.
Reductions in dietary fat, saturated fat, and cholesterol have been recommended to reduce the risk of heart disease in our society. The effects of these modifications on human cytokine production and immune responses have not been well studied. 22 subjects > 40 yr of age were fed a diet approximating that of the current American (14.1% of calories as saturat