Now showing items 31-40 of 45
Estimating population birth rates of zooplankton when rates of egg deposition and hatching are periodic
(Springer-Verlag, 1986-07)
I present a general method of computing finite birth and death rates of natural zooplankton populations from changes in the age distribution of eggs and changes in population size. The method is applicable to cases in which ...
EPR of a novel high-spin component in activated hydrogenase from Desulfovibrio vulgaris (Hildenborough)
(Elsevier, 1986-05-26)
The EPR of reoxidized hydrogenase from Desulfovibrio vulgaris (H.) has been reinvestigated. In contrast to other workers [(1984) Proc. Natl. Acad. Sci. USA 81, 3728-3732] we find the axial signal with g = 2.06; 2.01 to be ...
Regulation of macrophage tumor necrosis factor production by prostaglandin E2
(Elsevier, 1986-05-29)
We have studied the role of prostaglandin E2 on the modulation of tumor necrosis factor by immunologically elicited and lipopolysaccharide treated murine macrophages. Indomethacin, a potent inhibitor of prostaglandin E2 ...
Absence of xanthine oxidase or xanthine dehydrogenase in the rabbit myocardium
(Elsevier, 1986-12-30)
We directly measured the activity of the enzymes xanthine oxidase and xanthine dehydrogenase in rabbit and rat hearts, using a sensitive radio-chemical assay. Neither xanthine oxidase activity nor xanthine dehydrogenase ...
What regulates secretion of non-stored proteins by eukaryotic cells?
(Wiley Subscription Services, Inc., A Wiley Company, 1986-05)
Protein secretion is conventionally viewed as taking place by either of two cellular routes, a regulated pathway, involving external stimuli and secretory granules, and a presumptive ‘constitutive’ pathway, which does not ...
Isolation of a cDNA coding for human galactosyltransferase
(Elsevier, 1986-08-29)
Human milk galactosyltransferase (EC 2.4.1.22) was purified to homogeneity using affinity chromatography. Edman degradation was used to determine the amino acid sequences of eight peptide fragments isolated from the purified ...
Evidence for coupling of the [kappa] opioid receptor to brain GTPase
(Elsevier, 1986-11-10)
In membranes from guinea pig cerebellum, a tissue which predominantly contains [kappa] opioid receptors, exogenous and endogenous [kappa]-selective opioid agonists stimulated low-Km GTPase activity by 11-20% with concentrations ...
Tumor necrosis factor stimulates interleukin-1 and prostaglandin E2 production in resting macrophages
(Elsevier, 1986-04-14)
We have investigated the effect of tumor necrosis factor on the release of interleukin-1 and PGE2 from murine resident peritoneal macrophages. Tumor necrosis factor causes an increase in the production of interleukin-1 and ...
Conversion of leukotrienes A4 to C4 in cell-free systems
(Elsevier, 1986-01-14)
A procedure for assaying leukotriene C4 synthase activity in cell-free extracts has been presented. Leukotriene A4 methyl ester was as active a substrate as leukotriene A4 (Na salt) for the synthesis. The methyl ester is ...
Analysis of the mitochondrial and nuclear genomes of two basidiomycetes, Coprinus cinereus and Coprinus stercorarius
(Springer-Verlag, 1986-03)
The mitochondrial and nuclear genomes of Coprinus stercorarius and C. cinereus were compared to assess their evolutionary relatedness and to characterize at the molecular level changes that have occurred since they diverged ...