Spinach chloroplast lamellae were stained with aqueous uranyl acetate immediately after glutaraldehyde-osmium fixation but before dehydration and embedding. Under these conditions, the lamellae are shown in thin sections to have 95-A x 115-A coupling factor particles on their surfaces. The particles can be seen only on the matrix side of nonopposed thylakoids, and are shown to occur on both str...

Hohl, Hans R. (University of Hawaii, Honolulu). Nature and development of membrane systems in food vacuoles of cellular slime molds predatory upon bacteria. J. Bacteriol. 90:755-765. 1965.-During the digestion of bacteria by the myxamoebae of cellular slime molds, systems of concentric lamellae begin to appear within the food vacuoles. Each constituent lamella is a unit membrane of 75 to 85 A t...

Purified chloroplasts were disrupted and then fractionated by discontinuous sucrose-density-gradient centrifugation. Envelopes contained long-chain acyl-CoA synthetase at a specific activity 80 times the activity in the lamellae or the stroma. Acetyl-CoA synthetase was concentrated in the stroma, and chlorophyll was confined to the lamellae membranes. Phospholipase D was not detected in any fra...

The crossed lamellar microstructure of mollusk shells shows a very complex hierarchical architecture constituted of long rod-shaped aragonite crystals stacked parallel to each other inside each first order lamella, which are almost perpendicular to the ones contained in parallel neighboring lamellae. To better understand the construction and properties of the crossed lamellar microstructure we ...

The term "annulate lamellae" was first used by Swift (22) to describe pairs of cytoplasmic membranes arranged in parallel stacks and containing periodically spaced annuli. Generally, annulate lamellae have been observed in the cytoplasm of lower organisms (7-9, 11, 14, 22). However, they also have been found in the cytoplasm of the adrenal cortex of fetal rats (19), the liver and pancreatic aci...

A mechanism for the formation of lamellar systems in the plant cell has been proposed as a result of electron microscope observations of young and mature cells of Nitella cristata and the plastids of Zea mays in normal plants, developing plants, and certain mutant types. The results are compatible with the concept that lamellar structures arise by the fusion or coalescence of small vesicular el...

In addition to functional nuclear pore complexes engaged in nucleo-cytoplasmic transport, the cytoplasmic stacks of pore complexes, called annulate lamellae, exist in numerous cell types. Although both annulate lamellae and nuclear pore complexes are present in fertilized mammalian oocytes, their relative roles in the process of fertilization and preimplantation development are not known. Using...

Because the lamellae of block copolymers lack any internal order, their grain boundaries are simpler than those between grains of crystalline solids. While the latter are combinations of five different independent boundaries, the former can be decomposed into only two independent ones. In the kink grain boundary, the normals perpendicular to the lamellae of the two grains define a plane which i...