Electrophoretically homogeneous ribulose-1,5-bisphosphate (RuBP) carboxylase was obtained from autotropically grown Hydrogenomonas eutropha by sedimentation of the 105,000 X g supernatant in a discontinuous sucrose gradient and by ammonium sulfate fractionation followed by another sucrose gradient centrifugation. The molecular weight of the enzyme determined by light scattering was 490,000 +/- ...

Microsomal vesicles of oat roots (Avena sativa var Lang) were separated with a linear dextran (0.5-10%, w/w) or sucrose (25-45%, w/w) gradient to determine the types and membrane identity of proton-pumping ATPases associated with plant membranes. ATPase activity stimulated by the H(+)/K(+) exchange ionophore nigericin exhibited two peaks of activity on a linear dextran gradient. ATPase activiti...

Two density gradient ultracentrifugation methods, Redgrave et al. (1975. Anal. Biochem. 65: 42-49) and Nilsson et al. (1981. Anal. Biochem. 110: 342-348), currently used for the separation and analysis of plasma lipoproteins were compared with respect to their resolving power and capacity to obtain pure products as a function of time of ultracentrifugation using the same rotor (Beckman SW-40), ...

Using isopycnic density gradient centrifugation, lysosomes were concentrated in a single region of a sucrose-Ficoll gradient (p = 1-10 g cm-3), well separated from most other cell organelles. Gibberellic acid-induced lysosomes were found to be rich in alpha-amylase and protease but not ribonuclease. The lysosomal band also contained a majority of the NADH2-cytochrome c reductase, a marker enzym...

RNA polymerase II from larvae of the brine shrimp, Artemia salina, was highly purified by two cycles of DEAE-cellulose chromatography followed by centrifugation through discontinuous sucrose gradients. Gradient fractions were subjected to elctrophoresis is polyacrylamide gels containing sodium dodecyl sulfate. The subunit structure of RNA polymerase II was determined by quantitative comparison ...

with RFT tumors (9); and female BALB/c x DBA/2 @ mice with P-1798 lymphosarcomas. Animals were main tamed on the same diet and fed ad libitum. Twenty-four to 48 hr after the administration of 67Ga (‘†" j I mCi/kg), the animals were lightly anesthetized with ether and the tumor tissues were excised. The tissues were rinsed with 50 ml of 0.25 M sucrose and then homogenized in cold (5°)0.25 M...

objective(s) herpes simplex viruses (hsvs) have widespread and ubiquitous prevalence in the human population and they have received a great deal of attention due to the range of diseases, they caused as a result of an infection. it seems that the fast and reliable diagnostic methods are needed for detecting the herpes simplex virus type 1 (hsv1) antibodies especially in patients with hsv enceph...

The effects of osmolarity, calcium concentration and cell-size liposomes in the subphase on the surface tension of phospholipid monolayers were investigated. The monolayers were spread from chloroform solutions of phosphatidic acid at air/water solution interface. The liposomes (of average diameter 3 micron) were formed from phosphatidic acid/egg lecithin (1:2) mixtures in water or 0.1 M water ...

In this paper, we use Fresnel diffraction from a phase step in transmission to measure the diffusion coefficient transparent liquid. A glass plate immersed vertically cell containing two diffusing liquids makes transmission. When it is illuminated by parallel beam of light, pattern formed on screen perpendicular direction light beam. The inside leads variation along edge plate. refractive index...

Total smooth microsomes from rat liver isolated on a Cs(+)-containing sucrose gradient were concentrated and subsequently fractionated by zone centrifugation on a stabilizing sucrose gradient. The prerequisite for fractionation is to prepare total smooth microsomes in a nonaggregated condition, as well as to utilize a procedure which counteracts enzyme inactivation. The median equilibrium densi...