A comparative study of passive haemagglutination methods for the detection of hepatitis B surface antigen in routine hospital practice

Two passive haemagglutination methods for detecting HBsAg were compared. In general, the method using turkey erythrocytes was found preferable to the method employing sheep cells since it is more rapid and more sensitive, and less frequently gave rise to false positive reactions with sera from staff, blood donors, and patients not receiving haemodialysis. The turkey cell test gives rise to more false positive screen tests than the sheep cell test when monitoring renal dialysis patients since approximately 10% of the sera of these patients were found to contain turkey cell agglutinins, but this presents no particular difficulty if the recommended absorption procedures are used.     

Electrical properties of laser-annealed donor-implanted GaAs

A Q-switched ruby laser has been used to anneal GaAs implanted with selenium or tellurium ions. Electron concentrations in the range 1?2 × 1019 cm?3 were measured for samples implanted at room temperature or 200°C with a dose of 1?5 × 1015 ions cm?2. High electrical activities were obtained both with and without Si3N4 coatings.     

Deoxyribonuclease: detection with a three-hour test

A three-hour test has been developed to determine deoxyribonuclease activity of Enterobacteriaceae and staphylococci. The test is inexpensive and easy to perform. The rapid deoxyribonuclease test and the conventional method showed complete agreement with the strains tested.     

Thermally Induced Gelation of Native and Modified Egg White-Rheological Changes During Processing; Final Strengths and Microstructures

The heat-induced gelation of native egg white (EW) and egg white modified with succinic anhydride (SEW) or oleic acid (OEW), by addition of 15 moles of reagent/50000g protein, was evaluated. Rigidity modulus (G) and mechanical energy damping were continuously monitored during heating of the samples from 5 - 95°C in a nondestructive temperature-controlled thermal scanning rigidity monitor (TSRM). A measurable increase in G and decrease in energy damping were observed at lower temperatures for OEW than for EW. In SEW the measurable rheological transitions occurred at the highest temperature ranges. Failure strength of the cooked products (gels) evaluated using torsion and uniaxial compression tests revealed large differences due to treatments. Micrographs of gels showed apparent structural differences among treatments.     

Effects of temperature, photoperiod, and thiourea on the thyroid of the woodrat (Neotoma micropus)

Female inbred F344 rats fed diets containing high levels of beef protein and fat or high levels of soybean protein and corn oil and treated with 1,2-dimethylhydrazine had a greater incidence of colon tumours than did rats fed diets that had normal levels of such components and were treated similarly. The source of fat and protein had no major influence on the incidence of colon tumors.     

Strength of Hot-Pressed Silicon Nitride After High-Temperature Exposure

Short-term exposure of hot-pressed silicon nitride to temperatures greater than 800°C in an oxidizing atmosphere causes an increase in the room-temperature strength and eliminates the truncated strength distribution produced by room-temperature proof-testing. Acid-etching the proof-tested samples restores the original truncated distribution. These strength changes are shown to be related to the formation of a glassy phase on the surface that smooths out the preexisting machining flaws. More extensive, long-term oxidation produces surface pits that lead to an irreversible change in strength     

SOLUBLE PEROXIDASE ACTIVITY IN PURPLE, GREEN AND WHITE EGGPLANTS

Soluble peroxidase activity extracted from purple, green and white eggplants (Solanum melongena L.) was measured spectrophotometrically. Activity was significantly higher in the white variety than in the other two. The isozyme patterns were compared by polyacrylamide gel electrophoresis. The purple and green had 3 major isozyme bands between 0.8 and 0.9 Rf while the white contained 2. Only the white and purple cultivars contained bands between 0.06 and 0.3 and 0.6 and 0.7 Rf.