The RNA-P and DNA-P content of the nucleus and the RNA-P content of the whole cell of the livers of 8- to 20-day chick embryos and of adult fowls have been determined. The DNA-P content of the liver nuclei was slightly higher in the 8- and 10-day embryo than in all the other stages examined. A significant decrease in the RNA content of the cell occurred during embryonic development. The RNA con...

An in vitro translocation system has been reconstituted with subcellular fractions from the cell wall-less mutant of Neurospora crassa (fz;sg;os-1). Prepro alpha factor and invertase, secretory proteins from yeast, were faithfully translocated and glycosylated by Neurospora microsomes when presence cotranslationally in the Neurospora translation system. When presence cotranslationally in the Ne...

A biochemical and quantitative morphologic study of presynaptic endings during postnatal development was carried out in subcellular fractions from cerebral cortex of 1, 4, 8, 12, and 18 day old and adult rats. Crude mitochondrial fractions were subfractionated in Ficoll gradients and all resulting fractions were examined in the electron microscope. Presynaptic terminals and other intact process...

During our studies on the fatty acid composition of several lipid classes of subcellular fractions of bovine heart muscle, a peak which constituted 60% of the total fatty acids of mitochondrial triglycerides was consistently observed in GLC runs 1,2). The earlier assumption that this compound was either an artifact or a contaminant was inconsistent with the manner in which this compound consist...

Cyclosporin A and FK506, at concentrations that inhibited phosphatase activity of calcineurin in HL-60 cellular lysates, augmented the proliferation of leukemic HL-60 cells. These immunosuppressants did not affect Ia.25-dihydroxyvitamin D3 [1,25(0H),D,]-induced monocytic differentiation of HL-60 cells, but did abrogate the 1,25(OH)zD3-induced inhibition of HL-60 cell growth. Treatment with 20 n...

Analyses by differential centrifugation of liver homogenates from rats that had received 131I-labeled asialoorosomucoid showed that, 1 min after injection, most of the intracellular ligand was associated with a particle that did not sediment at 2.5 X 10(5) g-min. However, by 10 min, undigested ligand became associated with a particle that did sediment at this speed. On analytical ultracentrifug...

Glutathione (GSH) conjugation of trichloroethylene (Tri) to form S-(1,2-dichlorovinyl)glutathione (DCVG) has been implicated in the nephrotoxicity and nephrocarcinogenicity of Tri. Marked sex- and species-dependent differences exist, however, in the susceptibility to Tri-induced renal toxicity, with the male rat being the most susceptible. The present study, therefore, focuses on potential diff...

1. Rat-liver mitochondria showed a decrease in amino acid production after preparation in 0-25m-sucrose containing EDTA (lnm), but an increase in water content. When EDTA was replaced by Mn2+ (Imm) or succinate (lmM), both amino acid production and water content were lowered, whereas preparation in 0-9% potassium chloride caused an increase in both. 2. Amino acid production by rat-liver homogen...