Search

21/2–15 min nach i.v. Injektion von P32-Orthophosphat wird P32 vorwiegend im proximalen Konvolut der Katzenniere angetroffen. Die Pars recta des Hauptstücks und alle weiter distal gelegenen Antcile des Nephrons erzeugen im Gefrierschnitt-Radiogramm wesentlich geringere Schwärzungen. Es werden Gründe für die Auffassung angeführt, daß die Aktivitätsanhäufung im proximalen Konvolut den Ort der Phosphat-Rückresorption anzeigt.

High resolution and low drive features have been successfully combined in a new type of electron gun for cathode-ray tubes. The gun has a spot-defining aperture of 0.007 inch upon which emission from a large cathode area is concentrated by a retarding electron lens. This unit modulates the beam by electron reflection, while focusing it upon the aperture ("Focus Reflex Modulation"). Immediately ahead of the aperture, a modulated virtual cathode is formed with an emission capability of over four amperes per square centimeter. A1000-\microa beam with a 6° divergence is controlled by a signal of 12 volts centered at ground potential. Highlight brigntness of 250 foot lamberts was read at 17,500 volts, while more than 500 lines were resolved on a television test pattern. In more recent forms of the FRM gun,1600 \microa are measured in the screen return, out of1800-\microa cathode current. This is 88 per cent over-all transmission, using the same defining aperture (0.007 inch). 18 volts of drive signal will completely modulate the above current.

Mice of inbred strains DBA/2J, P/J, BDP/J, C57BL/6J, and F1hybrid B6D2F1(C57BL/6J × DBA/2J) mice were maintained on diets containing either 0, 10, or 30 mg of pyridoxine (vitamin B6) per kg of diet. Animals were placed on these diets when 3 to 4 weeks old and maintained on the diets for 7 weeks. Susceptibility to audiogenic seizures was determined 3, 5, and 7 weeks after the mice had been put on these respective dietary regimens. Mice of the dilute strain (homozygous d/d), i.e., strains DBA/2J, BDP/J, and P/J were found to be more susceptible to audiogenic seizures in the pyridoxine deficient state. Body weights were also recorded every 3 to 4 days. Dilute strains (DBA/2J, BDP/J and P/J) and the hybrid B6D2F1showed smaller increments in body weights on the pyridoxine deficient diets than did C57BL/6J mice.