(n.) The branch of chemistry which relates to the effect of light in producing chemical changes, as in photography.
Example Sentences:
(1) Photolysis of the photosystem I particles induces a progressive depletion of phylloquinone, however, photochemistry as assayed at room temperature by the photooxidation of P-700 is unaffected.
(2) Examples have been given for the three possibilities concerning photochemistry of nucleic acids and proteins.
(3) Studies of acrylamide quenching of tryptophan (Trp) fluorescence, photochemistry, and photoionization have been conducted.
(4) These results indicate that plastoquinone functions as the primary electron acceptor of Photosystem II and that beta-carotene does not play a direct role in the primary photochemistry but is required for the C-550 absorbance change.
(5) The photochemistry (Type I and II) of the phototoxic textile dye Disperse Blue (DB-35) and its purified components has been studied using electron spin resonance in conjunction with spin trapping technique and the direct detection of singlet oxygen (1O2) luminescence.
(6) The photochemistry of drugs can be useful (phototherapy) or harmful (phototoxicity).
(7) The photophysics and photochemistry of the 4'-diethylamino derivative of both 2-phenyl-benzothiazole and 2-(2'-hydroxyphenyl)benzothiazole have been studied by nanosecond and microsecond laser flash photolysis and picosecond emission spectroscopy.
(8) The HisM200----Leu RC, which has a heterodimer consisting of a bacteriochlorophyll and a bacteriopheophytin, is capable of the primary photochemistry observed in wild-type Rb.
(9) The photochemistry of benzanthrone (7H-benz[de]-anthracene-7-one) has been studied using electron paramagnetic resonance (EPR) in conjunction with the spin trapping technique and the direct detection of singlet molecular oxygen luminescence.
(10) The results are related to the photochemistry of thymidine and of bacteriophages containing incorporated 5-ethyluracil in place of thymine.
(11) The Hb photochemistry is a complex set of photoreactions leading to successive photoconversions of Hb forms: from oxy- to met- to deoxy- and, finally, to carboxy-form.
(12) The quenching action of dibromothymoquinone on fluorescence and on primary photochemistry was examined in chloroplasts at minus 196 degrees C. Both the initial (F0) and final (FM) levels of fluorescence as well as the fluorescence of variable yield (FV equals FM minus FO) were quenched at minus 196 degrees C to a degree which depended on the concentration of dibromothymoquinone added prior to freezing.
(13) These results were determined through nonlinear least squares regression and residual analyses, with some knowledge of the possible photochemistry of the cofactor by itself.
(14) The photochemistry of trace amounts of isobutene and oxides of nitrogen in an atmosphere of air was studied both in the presence and in the absence of small amounts of carbon monoxide.
(15) The basic law is: "No photobiology--no photochemistry".
(16) The photochemistry of the isolated Photosystem II reaction-centre core from pea and the green alga Scenedesmus was examined by e.s.r.
(17) This information is important not only for the understanding of the basic structure of vitamin A but also the photochemistry of vision.
(18) We have also attempted to do in situ fluorescence spectroscopy on isolated intact eye lenses, which has enabled us to follow the photochemistry and the status of the photoproduct of the oxidation of the trp residues of the crystallins of the lens.
(19) We have studied the photochemistry of the thymine-PABA and thymidine-PABA systems and report here the isolation and characterization of thymine-PABA and thymidine-PABA photoadducts.
(20) This indicates that the high irradiances available from the excimer laser cause the same DNA photochemistry as the lower-irradiance CW sources.
Phytochemistry
Definition:
(n.) Chemistry in its relation to vegetable bodies; vegetable chemistry.
Example Sentences:
(1) Clinical features, botany, phytochemistry, patch testing and ecology of Compositae and Frullania (liverwort) allergic contact phytodermatitis are discussed.
(2) A protein stimulating RNA polymerase activity that has been isolated and partially characterized previously (Walerych, W., Fabisz-Kijowska, A. et al., 1982, Phytochemistry, 21, 1495-1507) was subjected to investigations on its possible involvement in transcription process.
(3) having activity analogous to the 7-alkylamino-3-methylpyrazolo[4,3-d]pyrimidines (Hecht, S. M., 2068-2610; Skoog, F., Schmitz, R.Y., Hecht, S.M., and Bock, R. M. (1973) Phytochemistry 12, 25-37).
(4) (1977) Phytochemistry 16, 503-504) and are partly degraded at the acceptor terminus (Dziegielewski, T. and Pawełkiewicz, J.
(5) Their level and relative ratios change during germination (Augustyniak & Pawełkiewicz, 1978, Phytochemistry, 17, 15-18).
(6) In earlier studies [G. Hrazdina, G. J. Wagner, and H. W. Siegelman (1978) Phytochemistry 17, 53-56; G. J. Wagner and G. Hrazdina (1984) Plant Physiol.
(7) The aim of this article is to trace some features of the historical development of phytochemistry.
(8) (1984) Phytochemistry 23, 2431-2433) was partially purified with a six-step purification procedure following extraction.
(10) The phytochemistry and psychopharmacology of tobacco are well documented and there can be little doubt that this herb may produce toxic effects, when it is taken in the form of a clyster.
(11) The phytochemistry of the medicinal plants was determined from published research, and the likelihood of successful treatment of diseases was assessed by determining the known pharmacological actions of the plant constituents.
(12) The ethnobotany, ethnopharmacology and phytochemistry of the Thymelaeaceae are reviewed.
(13) Aza derivatives of these decalines (A. Rahier et al., Phytochemistry, in press), which were aimed to mimic the C-8 carbocationic intermediate occurring during later steps of the 2,3-oxidosqualene cyclization did not inhibit the cyclases.
(14) Using available information on the toxicity, phytochemistry, ethnomedical uses and geographic distribution of plants, potentially suitable species are identified for the control of intermediate hosts of schistosomiasis in Ethiopia's lowlands where endod (Phytolacca dodecandra) is not available.
(15) Results from this study suggest that functional phytochemistry based on ethnobotanical experience could lead to development of new and effective drugs from Chinese medicine.
(16) Brief descriptions of the botany, phytochemistry and reputed biological effects are provided.
(17) The article analyses the contributions to phytochemistry by the professors E. Schmidt (1845-1921), H. Thomas (1859-1931), H. Beckurts (1855-1929) and their research schools as well as those of K. Polstorff (1846-1911) and m. Scholtz (1861-1919).