Maurice H. Bernstein

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Hyaluronidase is a component of the acrosome of bovine spermatozoa. Utilizing fluorescein and peroxidase-labelled antibodies, the enzyme has been localised at both the light and electron microscopic levels. Antibodies against purified bovine testicular hyaluronidase were prepared in New Zealand white rabbits. Immunodiffusion, immunoelectrophoresis, and(More)
The fine structure of the tapetum of the cat eye has been investigated by electron microscopy. The tapetum is made up of modified choroidal cells, seen as polygonal plates grouped around penetrating blood vessels which terminate in the anastomosing capillary network of the choriocapillaris. The tapetal cells are rectangular in cross-section, set in regular(More)
The effect of direct ventilation of the eyes on cooling in the brain was investigated in domestic pigeons (Columba livia, mean mass 0.27 kg) with thermocouples chronically implanted in the hypothalamus and anterior eye chamber. During conductive heating in still air body-brain temperature difference (delta T) was 2.6 degrees C. During exclusive ventilation(More)
Incorporation of malachite green into a glutaraldehyde fixative results in enhanced staining of a number of cellular elements. Ribosomes and myofilaments exhibit increased electron density, but cell membranes generally are not stained. In certain tissues, lipid inclusions are uniformly and heavily stained. Other populations of lipid droplets exhibit(More)
Tidal volume (VT), respiration frequency (f) and respiratory evaporation (mre) were measured in the passeriform fish crow, Corvus ossifragus (mass 0.28 kg), during steady state, horizontal, wind-tunnel flight, at air speeds of 7.4-11.0 m-sec-1 and air temperatures (TA) of 12-28 degrees C. Ventilation (V1) of the respiratory system was calculated as f-VT.(More)
We investigated the effect of 2 months of exposure to cold conditions (0-5 C) on capillarization and on fiber size, distribution and ultrastructure in the pectoralis muscle of nine pigeons (Columbia livia; mean body mass 700 31 g) and compared the results with measurements from four control birds (mean mass 715 42 g) kept at normal ambient temperature(More)
Mannose-sensitive endocytosis by rat retinal pigment epithelium (RPE) explants was characterized using the mannose-rich glycoprotein horseradish peroxidase (HRP). The number of HRP-containing endosomes in the RPE was morphologically quantitated by light microscopy while the amount of HRP ingested was biochemically quantitated by enzyme assay. HRP(More)
Blood in mouth, nose, and eye tissues of birds cools by evaporation, then flows to a cephalic vascular heat exchanger, the ophthalmic rete. There, acting as a heat sink, blood from the evaporative surfaces cools arterial blood flowing counter-current to it toward the brain. The brain thus remains cooler than the body core. Data for unanesthetized domestic(More)