Basal Respiration
Mostrando 49-60 de 62 artigos, teses e dissertações.
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49. Rat liver adenyl cyclase activity in various thyroid states
Thyroidectomized and euthyroid rats were injected with three doses of triiodothyronine (T3) or of the diluent over a 6 day period, and liver homogenates were assayed for basal, epinephrine-stimulated, and NaF-stimulated adenyl cyclase activity. Based on NaF-stimulated levels, total adenyl cyclase activity, expressed per milligram of liver protein, was increa
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50. Aging of Escherichia coli
Clifton, C. E. (Stanford University, Stanford, Calif.). Aging of Escherichia coli. J. Bacteriol. 92:905–912. 1966.—The rates of endogenous and exogenous (glucose) respiration decreased much more rapidly than did the viable count during the first 24 hr of aging of washed, C14-labeled cells of Escherichia coli K-12 suspended in a basal salt medium devoid o
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51. EFFECT OF CHELATING AGENTS ON THE GROWTH OF ESCHERICHIA COLI IN SEAWATER1
Jones, Galen E. (Scripps Institution of Oceanography, University of California, La Jolla). Effect of chelating agents on the growth of Escherichia coli in seawater. J. Bacteriol. 87:483–499. 1964.—Escherichia coli did not grow at 37 C, or grew only after a prolonged lag phase in filter-sterilized basal seawater medium (synthetic or natural seawater suppl
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52. Inhibition of Ethylene Production by Cobaltous Ion 1
The effect of Co2+ on ethylene production by mung bean (Phaseolus aureus Roxb.) and by apple tissues was studied. Co2+, depending on concentrations applied, effectively inhibited ethylene production by both tissues. It also strongly inhibited the ethylene production induced by IAA, kinetin, IAA plus kinetin, Ca2+, kinetin plus Ca2+, or Cu2+ treatments in mun
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53. The unique endocrine milieu of the fetus.
Table II summarizes in tabular form the major features of the fetal endocrine milieu discussed in the foregoing pages. The mammalian fetus develops in an environment where respiration, alimentation, and excretory functions are provided by the placenta. Fetal tissue metabolism is oriented largely to anabolism; body temperature is modulated by maternal metabol
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54. Structure of a Microbial Community in Soil after Prolonged Addition of Low Levels of Simulated Acid Rain
Humus samples were collected 12 growing seasons after the start of a simulated acid rain experiment situated in the subarctic environment. The acid rain was simulated with H2SO4, a combination of H2SO4 and HNO3, and HNO3 at two levels of moderate acidic loads close to the natural anthropogenic pollution levels of southern Scandinavia. The higher levels of ac
American Society for Microbiology.
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55. Asymmetric Subcellular mRNA Distribution Correlates with Carbonic Anhydrase Activity in Acetabularia acetabulum1
The unicellular green macroalga Acetabularia acetabulum L. Silva is an excellent system for studying regional differentiation within a single cell. In late adults, physiologically mediated extracellular alkalinity varies along the long axis of the alga with extracellular pH more alkaline along the apical and middle regions of the stalk than at and near
American Society of Plant Physiologists.
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56. On the mechanism by which vascular endothelial cells regulate their oxygen consumption
Two enzymes, soluble guanylyl cyclase and cytochrome c oxidase, have been shown to be exquisitely sensitive to nitric oxide (NO) at low physiological concentrations. Activation of the soluble guanylyl cyclase by endogenous NO and the consequent increase in the second messenger cyclic GMP are now known to control a variety of biological functions. Cytoch
The National Academy of Sciences.
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57. Oxidative metabolism of neonatal and adult rabbit lung macrophages stimulated with opsonized group B streptococci.
We compared the oxidative metabolism of alveolar macrophages (AM) from adult and neonatal (1- and 7-day-old) rabbits before and after their in vitro exposure to type Ia group B streptococci (GBS) opsonized with immune rabbit serum. Nonstimulated AM from 1-day-old, 7-day-old, or adult rabbits consumed O2 at a rate of 17 to 20 nmol/10(6) AM per 10 min under ba
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58. A significant portion of mitochondrial proton leak in intact thymocytes depends on expression of UCP2
The uncoupling protein homologue UCP2 is expressed in a variety of mammalian cells. It is thought to be an uncoupler of oxidative phosphorylation. Uncoupling proteins previously have been shown to be capable of translocating protons across phospholipid bilayers in proteoliposome systems. Furthermore, studies in mitochondria from yeast overexpressing the
The National Academy of Sciences.
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59. Genetic Modification of Alternative Respiration Has Differential Effects on Antimycin A-Induced versus Salicylic Acid-Induced Resistance to Tobacco mosaic virus1
Salicylic acid (SA), a natural defensive signal chemical, and antimycin A, a cytochrome pathway inhibitor, induce resistance to Tobacco mosaic virus (TMV). Pharmacological evidence suggested signaling during resistance induction by both chemicals involved alternative oxidase (AOX), sole component of the alternative respiratory pathway (AP). Roles of the
The American Society for Plant Biologists.
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60. GCN5-dependent histone H3 acetylation and RPD3-dependent histone H4 deacetylation have distinct, opposing effects on IME2 transcription, during meiosis and during vegetative growth, in budding yeast
Diploid yeast undergo meiosis under certain conditions of nutrient limitation, which trigger a transcriptional cascade involving two key regulatory genes. IME1 is a positive activator of IME2, which activates downstream genes. We report that Gcn5, a histone H3 acetylase, plays a central role in initiation of meiosis via effects on IME2 expression. An allele,
The National Academy of Sciences.