RESUMO
The elevation of the concentration of tissue free water tritium (TFWT) in pine needles was discernible in trees growing around a nuclear power plant. The values varied from 2.6 Bq/l to 6.1 Bq/l with a mean value of 3.8 Bq/l. Analysis of pine needles collected at Fukui City as control samples was done. The values averaged 1.7 Bq/l and fell within 1.5 B/l-1.8 Bq/l which was obtained nation-wide survey of TFWT in pine needles in Japan. The present study also revealed that reactor tritium incorporated into pine needles decreased rapidly with a half time of 6 days and then tissue free water tritium has a short retention time.
Assuntos
Reatores Nucleares , Poluentes Radioativos/análise , Árvores , Trítio/análise , Japão , Centrais ElétricasRESUMO
Carriomycin, a new polyether antibiotic, was isolated from culture broth of Streptomyces hygroscopicus strain T-42082. It is active against Gram-positive bacteria, several fungi, yeasts and mycoplasma. It is also coccidiostatic. The free acid of carriomycin occurs as colorless prisms having the molecular formula C47H80O15 (M.W. 885.15), m.p. 120 approximately 122 degrees C and [alpha]25D -0.5 in methanol. It has no characteristic absorption maxima in the ultraviolet spectrum. The presence of one carboxyl and three methoxy groups was observed from its infrared, PMR and CMR spectra.
Assuntos
Antibacterianos/isolamento & purificação , Streptomyces/metabolismo , Antibacterianos/biossíntese , Antibacterianos/farmacologia , Bactérias/efeitos dos fármacos , Resistência Microbiana a Medicamentos , Fungos/efeitos dos fármacos , Mycobacterium/efeitos dos fármacos , Mycoplasma/efeitos dos fármacos , Saccharomyces cerevisiae/efeitos dos fármacosRESUMO
Lankacidin C, a component of lankacidin-group (T-2636) antibiotics, was esterified to lankacidin C 8-butyrate in the presence of methyl butyrate by culture broth and by cell-free extract of Bacillus megaterium IFO 12108. In addition, methyl isobutyrate, methyl valerate and methyl isovalerate served as acyl donors for the esterification, and lankacidin C 8-isobutyrate, lankacidin C 8-valerate and lankacidin C 8-isovalerate were formed respectively. Lankacidin C 8, 14-dibutyrate was hydrolyzed to lankacidin C 14-butyrate by the same organism.
Assuntos
Antibacterianos/metabolismo , Bacillus megaterium/metabolismo , Butiratos/biossíntese , Butiratos/metabolismo , Sistema Livre de Células , Meios de Cultura , Concentração de Íons de Hidrogênio , Lactonas , Fatores de TempoAssuntos
Antibacterianos/metabolismo , Aminoglicosídeos/metabolismo , Antibacterianos/farmacologia , Bactérias/efeitos dos fármacos , Cromatografia em Camada Fina , Meios de Cultura , Lactonas/metabolismo , Espectroscopia de Ressonância Magnética , Espectrometria de Massas , Testes de Sensibilidade Microbiana , Nocardia/metabolismo , Oxirredução , Espectrofotometria InfravermelhoAssuntos
Antineoplásicos/isolamento & purificação , Asparaginase/isolamento & purificação , Fusarium/enzimologia , Linfoma não Hodgkin/tratamento farmacológico , Animais , Asparaginase/análise , Asparaginase/classificação , Asparaginase/uso terapêutico , Reações Cruzadas , Epitopos , Escherichia coli/enzimologia , Camundongos , Camundongos Endogâmicos C3H , Neoplasias Experimentais/tratamento farmacológico , Testes de PrecipitinaAssuntos
Antibacterianos/metabolismo , Streptomyces/metabolismo , Antibacterianos/análise , Antibacterianos/farmacologia , Cromatografia em Camada Fina , Hidroxilação , Espectroscopia de Ressonância Magnética , Espectrofotometria Infravermelho , Análise Espectral , Staphylococcus/efeitos dos fármacosRESUMO
It was found that the 5''-hydroxy group of ribostamycin was preferentially phosphorylated by a cell-free extract from Pseudomonas aeruginosa GN 573, a clinical isolate.
Assuntos
Antibacterianos/metabolismo , Pseudomonas aeruginosa/enzimologia , Aminoglicosídeos/farmacologia , Sistema Livre de Células , Cromatografia em Camada Fina , Fosforilação OxidativaAssuntos
Asparaginase/metabolismo , Bactérias/enzimologia , Fungos/enzimologia , Glutaminase/metabolismo , Actinomycetales/enzimologia , Bactérias/crescimento & desenvolvimento , Colorimetria , Enterobacteriaceae/enzimologia , Fungos/crescimento & desenvolvimento , Especificidade da Espécie , Estereoisomerismo , Leveduras/enzimologiaAssuntos
Ascomicetos/enzimologia , Bacteriólise , Hexosaminidases/isolamento & purificação , Cloreto de Cálcio/farmacologia , Cromatografia DEAE-Celulose , Meios de Cultura , Ativação Enzimática , Hexosaminidases/metabolismo , Hexosaminidases/farmacologia , Concentração de Íons de Hidrogênio , Magnésio , Micrococcus/efeitos dos fármacos , Cloreto de Sódio/farmacologia , Staphylococcus/efeitos dos fármacos , Compostos de Sulfidrila , TemperaturaAssuntos
Fermentação , Contaminação de Alimentos/análise , Fungos/isolamento & purificação , Micotoxinas/isolamento & purificação , Animais , Bioensaio , Técnicas de Cultura , Fluorescência , Conservação de Alimentos , Japão , Rim/efeitos dos fármacos , Fígado/efeitos dos fármacos , Masculino , Camundongos , Micotoxinas/farmacologia , Espectrofotometria , Estômago/efeitos dos fármacosRESUMO
The enzymatic transfer of ribose and deoxyribose residues in pyrimidine nucleosides to purines was catalyzed by cell-free extracts of various bacteria. Almost all the strains belonging to Enterobacteriaceae were capable of catalyzing the transfer reactions. The transfer activities were also detected among some bacterial strains of other families: Pseudomonadaceae, Corynebacteriaceae, Micrococcaceae, Bacteriaceae, and Bacillaceae. The rates of the transfer reactions were greatly enhanced in the presence of phosphate ion, and the participation of nucleoside phosphorylases in the reactions was suggested. Uridine phosphorylase, thymidine phosphorylase, and purine nucleoside phosphorylase were purified from cell-free extract of Aerobacter aerogenes IFO 3321. The ribosyl transfer from uridine to hypoxanthine was found to be catalyzed by the coupled reactions of uridine and purine nucleoside phosphorylases and the deoxyribosyl transfer from thymidine to hypoxanthine by the coupled reactions of thymidine and purine nucleoside phosphorylases.