Bioelectric responses from the isolated eye of the purple shore
crab were measured by the electroretinogram with stimulation by
light from wavelengths of 250 to 800 nm, strontium-yttrium-90 beta
radiation, 17.5 keV x-radiation, and 3-cm microwaves.
Peak sensitivities to light stimulation were found at 350 and 500
nm. These peaks...
Roughskin newts, Taricha granulosa (Skilton), were exposed to
UV-B (280-320nm), UV-A (321-380 nm), and visible radiation from
fluorescent sunlamps (Westinghouse FS40) that were filtered with
cellulose acetate film. UV-B controls were exposed to irradiation
from sunlamps that were filtered with Mylar-D, a polyester film
that effectively absorbed UV-B radiation while...
Partial purification of diamine oxidase from pea seedlings,
Pisum sativum, was accomplished by homogenization of 8-10 day
etiolated epicotyl tissue, followed by ammonium sulfate fractionation
and DEAE Sephadex column chromatography. The preparation thus
obtained was purified 50 fold.
Some properties of this enzyme were investigated. A radio-tracer method was adapted...
Three types of experiments were designed to further characterize
the tryptophan decarboxylating enzyme of Reed and Crecelius
(1967).
1) Light inhibition studies were made with etiolated pea seedlings
to determine the in vitro response of the tryptophan decarboxylating
enzyme. Assays of indoleacetic acid oxidase (IAA oxidase)
and guaiacol-active pea seedling...
In order to determine the total number of cytochrome P-450 isozymes
present in a given species following various treatments, mature
male rats (Sprague-Dawley) were injected intraperitoneally with the
classic mixed-function oxidase inducers phenobarbital (PB), pregnenolone-
16a-carbonitrile (PCN), 3-methylcholanthrene (3-MC), or the appropriate
control vehicle.
Hepatic microsomes were solubilized and P-450...
The effects of five cytokinin antagonists on the growth
of cytokinin-autonomous lines of Phaseolus lunatus cv.
Kingston, Phaseolus vulgaris cv. Great Northern, and
Nicotiana tabacum cv. Wisconsin 38 callus tissues have been
compared. The antagonists tested included four N⁴-substituted 4-amino-2-methylthiopyrrolo[2,3-d]pyrimidines
bearing the following N⁴ side chains, 4-n-pentyl-
(ms²pnN⁴Prp), 4-n-hexyl- (ms²HxN⁴Prp),...
1-Phenyl-3-(2-Thiazoly1)-2-Thiourea (PTTU), has been reported to
inhibit dopamine-fi-hydroxylase (a copper-containing enzyme involved in
the pathway of biosynthesis of adrenaline in animal systems). In the
present study, PTTU has been shown to have cytokinin activity in the
tobacco bioassay. The cytokinin activity of PTTU suggested that
cytokinin-active N⁶-substituted adenine derivatives might...
Lack of growing season precipitation and the temperate climate in north central Oregon pose challenges to growing spring wheat crops. Phosphate and sulfate fertilization can improve early growth of spring wheat in this region and soil testing aids in determining rates of fertilization. In this study, anion exchange membranes (AEM)...