(a.) Of or pertaining to chemical action of light, or produced by it; as, the photochemical changes of the visual purple of the retina.
Example Sentences:
(1) These results suggest that photochemical modification of a single residue of aspartate (or asparagine) is largely, if not entirely, responsible for photoinactivation of the enzyme under these conditions.
(2) The probes were biotin treated by chemical modification of the DNA by the peraminating reagent or photochemically.
(3) All recombinants were found to be photochemically active, in that optical bleaching produced a temperature- and lipid chain-length-dependent mixture of species absorbing at 480 and 380 nm.
(4) We have investigated the relationship between rhodopsin photochemical function and the retinal rod outer segment (ROS) disk membrane lipid composition using flash photolysis techniques.
(5) Once training was complete, unilateral, bilateral or sham-infarction restricted to the region of the primary somatosensory cortex was produced by a non-invasive photochemical technique, which induces platelet-activated vascular occlusion combined with blood-brain barrier changes and subsequent cell death.
(6) Finally, the estimate of the photochemical activity of P-700, based upon the measured fluorescence quantum yield and upon the measured nonradiative losses of excitation energy, was done.
(7) The purpose of the present study was to develop a technique capable of detecting photochemical changes in the genetic material of human cells in tissue culture.
(8) The photochemical activities and fluorescence properties of cells, spheroplasts and spheroplast particles from the blue-green alga Phormidium luridum were compared.
(9) The photochemical action spectrum for the light reversal of inhibition showed a single maximum of effectiveness at about 420 nm.
(10) In the present study we examined the effect of systemic tocainide on sensory hypersensitivity in rats after spinal cord ischemia induced by a photochemical technique.
(11) Because there is no lower intensity threshold for photochemical reactions, it seems probable that the photobiological effects described in this paper occur in most newborns to some degree.
(12) The antithrombotic properties of Placenta Protein 4 (PP4) were investigated in laser or photochemically induced thrombus formation models in rats.
(13) The photochemical reactions were initiated by ultraviolet light of lambda greater than 300 mn, employing acetone as a photosensitizer.
(14) Photochemical alterations following ultraviolet irradiation of the alternating copolymer d(GT)n.d(CA)n were studied.
(15) Model experiments with two structurally different proteins (alcohol dehydrogenase and salmine) show that glycine, alanine, and tyrosine are by far more frequently involved in photochemically induced cross-link formations with DNA than is cysteine.
(16) Reaction centers reconstituted with other quinones also showed restored photochemical activity, although they exhibited changes in their low-temperature recombination kinetics and light-induced (g = 1.8) EPR signal is interpreted in terms of a magnetically coupled ubiquinone--Fe2+ acceptor complex.
(17) For this purpose photochemically induced dynamic nuclear polarization 1H nuclear magnetic resonance (CIDNP 1H NMR) spectroscopy and quenching of tryptophan and tyrosine fluorescence by acrylamide were applied to an apocytochrome c-sodium dodecyl sulfate (SDS) micellar system.
(18) The effect of photochemical fluorochromizing used in the method suggested consists in the following: after the exposure of sections to short-wave ultraviolet irradiation the preparations start to fluorescence intensively in the visible region with the long-wave the myocardium of mice, dogs and section materials showed that following photochemical fluorochroming the intensity of lumenescence of damaged cells of the myocardium increased markedly as compared with that of intact cells.
(19) KCN or iodine also blocked NO production by tissue, but had no effect upon photochemical NO release.
(20) The main limitation of phototherapy is that it is inefficient, a limitation that seems to be imposed by transport processes in the body and the optics of skin rather than by the photochemical reactions on which it depends.
Phytochemical
Definition:
(a.) Relating to phytochemistry.
Example Sentences:
(1) A phytochemical investigation of an ethanolic extract of the whole plant of Echites hirsuta (Apocynaceae) resulted in the isolation and identification of the flavonoids naringenin, aromadendrin (dihydrokaempferol), and kaempferol; the coumarin fraxetin; the triterpene ursolic acid; and the sterol glycoside sitosteryl glucoside.
(2) The use of a small precolumn instead of an injection loop for the determination of a new phytochemical drug, fellavine, and its metabolites is described.
(3) A phytochemical investigation of the roots of Tiliacora funifera (Menispermaceae) resulted in the isolation and identification of funiferine N-oxide, a new bis(benzylisoquinoline) alkaloid.
(4) The scientific community has begun to appreciate the potential importance of nonnutritive dietary compounds (phytochemicals) in foods such as soybeans.
(5) Preliminary phytochemical investigation of the leaves of Synclisia scabrida indicated the presence of two alkaloids in the water extracts and five alkaloids in the ethanol extracts.
(6) These extracts contained triterpenic saponins, tannins, and flavonoids as estimated through phytochemical screening.
(7) A large phytochemical survey of the flora of the Malaysian Peninsula and Sabah is described, covering the systematic search for alkaloids, and partly, for saponins and flavonoids.
(8) Hydroalcoholic extracts of the tuber were fractionated by precipitation or solvent partition and the various extracts or fractions subjected to phytochemical and pharmacological tests.
(9) A search in ancient Chinese medicinal literature and modern phytochemical references indicates that the therapeutic value of Leonurus artemisia (I-mu ts'ao, the Chinese motherwort) might reside in a uterotonic principle present in leaves.
(10) The success of such a defense depends upon phytochemical mimicry of vertebrate reproductive hormones.
(11) The phytochemical was mutagenic in tester strains TA98 and TA100 and required activation by the hepatic S-9 microsomal enzyme preparation.
(12) A versatile poly-functional pilot plant has been developed to enable the production of herbal preparations as well as extracts and phytochemicals.
(13) Ten plant species, specifically employed by the Indians against these disorders, were subjected to phytochemical screening.
(14) Vegetables and fruits containing other phytochemicals suspected to be cancer inhibitors were also examined.
(15) Phytochemical and pharmacological studies on Taxus sp extracts have resulted in the isolation and the identification of several diterpenoids, and the discovery of the potent antitumor activity of taxol.
(16) Cardenolides were detected in WP by phytochemical screening.
(17) Literature on the phytochemical study of plant estrogens is reviewed.
(18) The preliminary phytochemical investigations have revealed the presence of flavonoids, iridoids, phenolic acids, saponins, amino acids, free sugars, and mucilages in the lyophilized infusion obtained from flowers of Verbascum thapsiforme Schrad.
(19) A phytochemical investigation of the acidic fraction from an ethanolic extract of the roots of Ruscus aculeatus L. (Liliaceae) has resulted in the isolation and identification of a sterol mixture, a fatty acid mixture, chrysophanic acid, a new compound named euparone and an incompletely characterized phenolic substance.
(20) Many bioactive phytochemicals have been shown in recent years to be photosensitizers, i.e.