RESUMO
The previously reported ability of SP-Sephadex C25 column chromatography for partitioning biologically important cobalamins has been modified to include analytical separation of nitritocobalamin (NO2-Cbl) and nitrosocobalamin (NO-Cbl). Gel column dimensions (1.5 x 11.0 cm), a low eluent flow-rate (125 microliters/min), collection of small eluate fractions (160 microliters) plus maintenance of He saturated mobile and gel phases all combined to eliminate ordinarily confusing proximal elution of NO2-Cbl and NO-Cb1 with sulfitocobalamin (SO3-Cbl) and cyanocobalamin. Cobalamin elution profiles from the gel column were monitored by direct radiometric analysis of 57Co-labelled cobalamin standards or competitive intrinsic factor radioassays for cobalamin sample sizes up to 10.0 ng. Failure to implement the chromatographic conditions detailed here totally obscured analysis of NO2-Cbl coexisting with SO3-Cbl in brain tissues for chicks exposed to dietary sulfites and caused oversight of NO-Cb1 normally coexisting in prepared NO2-Cbl standards.
Assuntos
Hidroxocobalamina/análogos & derivados , Compostos Nitrosos/isolamento & purificação , Vitamina B 12/análogos & derivados , Vitamina B 12/isolamento & purificação , Animais , Química Encefálica , Galinhas , Cromatografia por Troca Iônica , Radioisótopos de Cobalto/análise , Dieta , Hidroxocobalamina/isolamento & purificação , Masculino , Técnica de Diluição de Radioisótopos , Sulfitos/farmacocinéticaRESUMO
Factors affecting high yields, regeneration frequencies, and viability of protoplasts from clonal cultures of Microsporum gypseum were investigated. Maximum yields of protoplasts were obtained after 6 hrs digestion of 2-4 days old mycelium with Novozyme 234 using CaCl2 (0.4 M) as an osmotic stabilizer and glycine + HCl (pH 4.5) as the buffer system. Mercaptoethanol + dithiothreitol (0.01 M) proved to be the best pretreatment of mycelium prior to digestion with enzyme. A regeneration frequency of 94.4% was obtained using the top agar method with complete medium (pH 6.5) containing 0.5% agar and 0.4 M CaCl2 as an osmoticum. Colonies from regenerated protoplasts on medium containing CaCl2 were pigmented and completely powdery with high sporulation. Protoplast viability was studied in osmotic stabilizer supplemented with glucose or glutamine. After 24 hrs, glucose (2%) and glutamine (2%) enhanced protoplast viability by 22% and 23%, respectively. Protein synthesis, as measured by 3H-lysine uptake, matched the viability profile determined by fluorescence microscopy.
Assuntos
Microsporum/fisiologia , Protoplastos/fisiologia , Soluções Tampão , Concentração de Íons de Hidrogênio , Microsporum/crescimento & desenvolvimento , Concentração Osmolar , Regeneração , Análise de Regressão , Fatores de TempoAssuntos
Malonatos/urina , Ácido Metilmalônico/urina , Deficiência de Vitamina B 12/metabolismo , Vitamina B 12/metabolismo , Animais , Peso Corporal , Medula Óssea/patologia , Encéfalo/metabolismo , Hematócrito , Hemoglobinas/metabolismo , Fígado/metabolismo , Masculino , Ratos , Vitamina B 12/sangue , Deficiência de Vitamina B 12/patologiaRESUMO
Nerves in the tongues of adult and immature rats were examined with respect to their permeability to exogenous cytochrome-c (mol wt 12,000) injected into the tongue. The distribution of cytochrome-c was determined in cryostat sections on the basis of the peroxidase activity of this protein. Nerves of 14-day-old rats were permeable to injected cytochrome-c. The larger nerves of older animals showed only localized accumulations of cytochrome-c reaction product both between and within axons adjacent to endoneurial blood vessels. Reaction product was not found, however, in association with blood vessels penetrating nerves of the tongue that were not within the limits of tracer spread. In the smallest nerve brances, thin linear strands of reaction product filled the interstices between the nerve fibers.
Assuntos
Grupo dos Citocromos c/metabolismo , Nervos Periféricos/metabolismo , Animais , Axônios/metabolismo , Nervo Hipoglosso/metabolismo , Masculino , Bainha de Mielina/metabolismo , Permeabilidade , Peroxidases/análise , Ratos , Língua/inervaçãoAssuntos
Transporte Axonal , Nervo Óptico/metabolismo , RNA de Transferência/metabolismo , Animais , Transporte Axonal/efeitos dos fármacos , Cromatografia em Gel , Dextranos/farmacologia , Escherichia coli , Gânglios/citologia , Masculino , Nervo Óptico/efeitos dos fármacos , Radioisótopos de Fósforo , RNA Bacteriano/metabolismo , Ratos , Retina/inervaçãoAssuntos
Adenosina Trifosfatases , Encéfalo/enzimologia , Adenosina Trifosfatases/antagonistas & inibidores , Animais , Anticonvulsivantes , Encéfalo/efeitos dos fármacos , Isótopos de Carbono , Fenômenos Químicos , Química , Ativação Enzimática , Feminino , Iminas , Cetonas/síntese química , Dose Letal Mediana , Magnésio/farmacologia , Camundongos , Ouabaína/antagonistas & inibidores , Ouabaína/farmacologia , Oxazóis/sangue , Oxazóis/síntese química , Oxazóis/farmacologia , Oxazóis/uso terapêutico , Oxazóis/toxicidade , Potássio/farmacologia , Convulsões/tratamento farmacológico , Sódio/farmacologia , Trimetadiona/farmacologiaAssuntos
Antibacterianos/farmacologia , Encéfalo/metabolismo , Proteínas do Tecido Nervoso/biossíntese , Animais , Aprendizagem da Esquiva/efeitos dos fármacos , Comportamento Animal/efeitos dos fármacos , Proteínas Sanguíneas/metabolismo , Encéfalo/efeitos dos fármacos , Cromatografia em Papel , Cicloeximida/farmacologia , Cyprinidae , Eletroforese , Eletrochoque , Rim/efeitos dos fármacos , Rim/metabolismo , Leucina/metabolismo , Puromicina/farmacologia , Espectrofotometria , TrítioRESUMO
Rats with one- or two-stage lesions in the hippocampus, anzygdala, or frontal cortex were tested on a variety of tasks. Even though locus and amount of tissue damage were very similar in the two groups, animals with one-stage lesions were impaired as judged by performance on all problems, while aninmals with two-stage lesionis were not.
Assuntos
Tonsila do Cerebelo/fisiologia , Aprendizagem por Discriminação , Lobo Frontal/fisiologia , Animais , Hipocampo/fisiologia , Masculino , RatosAssuntos
Encéfalo/metabolismo , Estimulantes do Sistema Nervoso Central/metabolismo , Oxazóis/metabolismo , Animais , Química Encefálica , Tronco Encefálico/metabolismo , Isótopos de Carbono , Núcleo Caudado/metabolismo , Cerebelo/metabolismo , Córtex Cerebral/metabolismo , Dimetil Sulfóxido , Hipocampo/metabolismo , Masculino , Pemolina/metabolismo , RatosAssuntos
Dimetil Sulfóxido , Pemolina/administração & dosagem , Resolução de Problemas/efeitos dos fármacos , Animais , Comportamento de Ingestão de Líquido/efeitos dos fármacos , Injeções Intraperitoneais , Magnésio/administração & dosagem , Masculino , Pemolina/farmacologia , Veículos Farmacêuticos , RatosRESUMO
Pemoline-C(14) dissolved in dimethyl sulfoxide and injected intraperitoneally into rats was found in larger amounts in the brain than was a similar dose given in 0.3 percent tragacanth suspension. This appeared to be related to a partial breakdown of the blood-brain barrier in vivo by the dimethyl sulfoxide.