Cell-to-cell channels composed of connexin44 and connexin50 were purified from plasma membranes of calf and fetal bovine lenses. The channels were treated with the nonionic detergents octyl-beta-D-glucopyranoside and decyl-beta-D-maltopyranoside, and the channel/detergent complexes purified by ion and gel filtration column chromatography. In negative staining, the channels appeared as annuli 11...

Potassium is actively transported from blood-side to lumen of the isolated silkworm midgut (Harvey & Nedergaard, 1964). Rubidium is also actively transported and, when present in equal amounts, potassium and rubidium compete on an almost equal basis (Nedergaard & Harvey, 1968). Recently, Zerahn (1970) has found that caesium as well is actively transported, but the competition with potassium is ...

Let X ⊂ P be a smooth irreducible projective threefold, and d its degree. In this paper we prove that there exists a constant β such that for all X containing a smooth ruled surface as hyperplane section and not contained in a fourfold of degree less than or equal to 15, d ≤ β. Under some more restrictive hypothesis we prove an analogous result for threefolds containing a smooth ruled surface a...

Liposomes encapsulating actin filaments were prepared by swelling at 0 degrees C lipid film consisting of a mixture of dimyristoyl phosphatidylcholine and cardiolipin (equal amounts by weight) in 100 microM rabbit skeletal muscle actin and 0.5 mM CaCl2 followed by polymerization of actin at 30 degrees C. Liposomes initially assumed either disk or dumbbell shape, but when cytochalasin D was adde...

Since the deficiency syndrome caused by lack of essential fatty acids (EFA) was first described by Burr & Burr (1929) many species besides rats have been shown to require EFA, but evidence about the pig is rather sparse and conflicting. Ellis & Isbell (1926) and Ellis & Zeller (1930) reared pigs on diets containing only 0 . 5 7 ~ 'ether extract', but observed none of the classical signs of EFA ...

To characterize chylomicron remnant clearance by the liver, plasma elimination of retinyl palmitate-labeled chylomicron remnants was studied in 18 healthy subjects, ages 21-42 years. Autologous plasma containing retinyl palmitate-labeled chylomicrons and their remnants was injected intravenously, and retinyl palmitate disappearance was measured in serial plasma samples in all subjects and in li...

To assess antibody and cellular immune responses, 156 healthy children were immunized at approximately 18 months of age with acellular diphtheria-tetanus-pertussis vaccine. Changes in antibody responses to filamentous hemagglutinin (FHA) and to pertussis toxin (PT) were similar in pattern, and antibody titers reached values equal to those from patients with convalescent-stage pertussis. The FHA...