Results 231 to 240 of about 48,779 (251)

Entamoeba histolytica: Nucleic acid precursors affecting axenic growth

Experimental Parasitology, 1980
Abstract Treatment of Panmede and Trypticase, in water, with activated carbon and subsequently combining the filtered solution with glucose, cysteine, salts, serum and vitamins results in a medium depleted in the nucleic acid precursors required to sustain a high level of growth of axenic Entamoeba histolytica.
Richard E. Reeves, Betty West
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The E. coli mRNA as a precursor for the T4 phage nucleic acids

Molecular and General Genetics MGG, 1974
Labelling experiments with 14C-guanine have shown that the degradation products of E. coli mRNA are completely employed for the synthesis of T4 phage specific nucleic acids. Also, the host DNA labelling is completely recovered in the phage DNA whereas the stable RNA is quantitatively unaffected. Kinetic experiments lead to estimate the half life of the
P. R. R. Vigier, H. Marcovich
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Effects of colchicine on the incorporation of nucleic acid precursors into rat liver ribosenucleic acid

Biochemical Pharmacology, 1964
Abstract Subcutaneous injection of 1.0–1.l mg of colchicine/kg body weight into adult Sprague-Dawley rats 16–18 hr prior to the administration of radioactive nucleic acid precursors led to elevation over control values of the specific activities of the pyrimidines and purines of liver RNA.
Herbert Weinfeld, Avery A. Sandberg
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Incorporation of labeled precursors into proteins and nucleic acids of nuclei of regenerating liver

Experimental Cell Research, 1962
Abstract The incorporation of glycine-1- 14 C and adenine-8- 14 C into nuclear proteins and nucleic acids, respectively, of regenerating liver has been determined at various intervals following partial hepatectomy of rats. The specific activities of acid-insoluble nuclear proteins reached peaks at 19 hr and 37 to 43 hr after partial hepatectomy ...
J.L. Irvin, David J. Holbrook, J.H. Evans   +2 more
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Studies on the uptake of nucleic acid precursors into cells in tissue culture

Biochimica et Biophysica Acta (BBA) - General Subjects, 1968
Abstract Persantin specifically inhibits the uptake of nucleosides and deoxynucleosides into tissue culture cells without interfering significantly with the uptake of free bases, formate and leucine, or with DNA, RNA and protein synthesis. The uptake of most of the nucleosides follows normal Michaelis-Menten kinetics.
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Nucleic acid precursor synthesis by Plasmodium lophurae parasitizing chicken erythrocytes

Experimental Parasitology, 1973
Abstract Chicken erythrocytes parasitized by Plasmodium lophurae were cultured in vitro in the presence of glycine-2-14C, glycine-U-14C, and 14C-Na-formate for 10–16 hr. Purines isolated from the acid-soluble fraction (ASF), RNA and DNA of parasitized blood exposed to 14C-glycine contained specific activities equivalent to those of uninfected ...
Robert W. Hull, Theodore Booden
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Polynucleotide analogues as possible primitive precursors of nucleic acids

Origins of life and evolution of the biosphere, 1986
Activated derivatives of purine-containing deoxynucleosidedimonophosphates spontaneously oligomerize to produce pyrophosphatelinked oligonucleotide analogues. These analogues are of potential interest as models of primitive, polynucleotide precursors.
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Independent blood-brain barrier transport systems for nucleic acid precursors

Biochimica et Biophysica Acta (BBA) - Biomembranes, 1975
The blood-brain barrier permeability to certain 14-C-labelled purine and pyrimidine compounds was studied by simultaneous injection in conjunction with two reference isotopes into the rat common carotid artery and decapitation 15s later. The amount of 14-C-labelled base or nucleoside remaining in brain was expressed in relation to 3-H2O (a highly ...
William H. Oldendorf, Eain M. Cornford
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Uptake of tritiated nucleic acid precursors by Babesia bovis in vitro

International Journal for Parasitology, 1986
Abstract Uptake of tritiated nucleic acid precursors by Babesia bovis in vitro. International Journal for Parasitology 16 : 263–268. The uptake of tritiated nucleic aid precursors in vitro by two Babesia bovis isolates, from Mexico and South Africa, was compared using a semiautomated microdilution method.
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Requirements ofAcholeplasma laidlawii A, strain LA 1, for nucleic acid precursors

Folia Microbiologica, 1974
The requirements for nucleic acid precursors byAcholeplasma laidlawii type A, strain LA 1, were studied. The absence of a requirement for ribose or deoxyribose and the interconvertibility of uridine and cytidine contrasts with previously reported results with strain pG 8.
B. Liška, B. Liška, P. F. Smith, P. F. Smith   +3 more
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