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Wicks C - - 1998
Satellite interferometric synthetic aperture radar is uniquely suited to monitoring year-to-year deformation of the entire Yellowstone caldera (about 3000 square kilometers). Sequential interferograms indicate that subsidence within the caldera migrated from one resurgent dome to the other between August 1992 and August 1995. Between August 1995 and September 1996, the ...
Thorpe W H - - 1975
Duetting plays a very important part in the signal system between male and female in a large number of bird species, in particular species that inhabit tropical regions. These elaborate song patterns show many interesting features, of which only a few have been discussed here. Perhaps the most interesting result ...
Kennedy B L - - 1971
1. The inotropic effects of two antiarrhythmic drugs, lignocaine and phenytoin, were studied in electrically driven isolated rabbit atrial preparations. The time-effect relationship of each drug was investigated with different concentrations and frequencies of stimulation.2. The effects of time of exposure, drug concentration and heart rate on the development of ...
Walker R J - - 1970
1. The intravenous injection of para-methoxyphenylethylamine (PMPEA) into cats produces an increase in the size of the spinal cord monosynaptic reflex. The reflex elevation occurs within 30 s of drug administration, reaches a peak within 2 min, and lasts about 20 min.2. The action of PMPEA is similar for extensor ...
Eckert R - - 1967
The light emitted by Noctiluca has its origin in 1 to 5 x 10(4) organelles ("microsources") which are scattered throughout the perivacuolar cytoplasm, and which appear to be the elementary functional units of bioluminescence. Microscopical techniques, image intensification, and microphotometry were employed in their investigation. Microsources are fluorescent, strongly phase-retarding, ...
Gray A R - - 1967
Although immunological methods have not been used on a wide scale for the study of trypanosomiasis in Africa, there is hope that immunological research will lead to improved methods of diagnosis, methods for the classification of trypanosome strains, better understanding of the epidemiology, epizootiology and pathology of trypanosomiasis, and ultimately ...
BENFEY B G - - 1964
In cats treated with reserpine and anaesthetized with pentobarbitone sodium the adrenergic blocking drug, tolazoline, caused a rise of arterial pressure which was inhibited by previous administration of phenoxybenzamine. Tolazoline increased the contractions of the isolated papillary muscles of normal cats but not of cats treated with reserpine. Intra-arterial injection ...
BROWN D A - - 1962
The intra-arterial injection of chloral hydrate potentiated the transmission of nerve impulses through the cat superior cervical ganglion, antagonized the ganglionblocking action of hexamethonium, and greatly enhanced the ganglion-stimulant action of acetylcholine. Effects on the ganglion-stimulant actions of carbachol, nicotine, tetramethylammonium and potassium chloride were slight or absent. Chloral hydrate ...
HAWKING F - - 1960
Homidium, quinapyramine, and suramin (Group II compounds) produce their trypanocidal effect in vivo only after a latent period of 24 hr. or more, during which time the trypanosomes may continue to multiply; this is in contrast to trivalent arsenical and diamidine compounds (Group I compounds), which begin to act immediately. ...
FARQUHARSON M E - - 1958
The biological action of a series of chlorinated phenols has been investigated. With increasing chlorination there is an increase in toxicity in which the convulsant action of phenol is replaced by the signs characteristic of poisoning by dinitrophenol; the higher chlorinated phenols produce a contracture of the isolated rat phrenic ...
GIESE A C - - 1953
1. The amount of visible or long ultraviolet light (UV) required to photoreactivate Colpidium colpoda injured with known dosages of short UV (2654 A) was determined. 2. The effect of the short UV was tested by the delay in division of exposed animals compared to controls. Photoreactivation was tested by ...
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