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Sida 1 från 16 resultat
Binding and protection of porphyrins by glutathione S-transferases of Zea mays L.
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Glutathione S-transferases (GSTs) are multi-functional enzymes, known to conjugate xenobiotics and degrade peroxides. Herein, we report on the potential of four Zea mays GST isoforms (Zm GST I-I, Zm GST I-II, Zm GST II-II and Zm GST III-III) to act as binding and protection proteins. These isoforms
Induction of porphyrin synthesis in etiolated bean leaves by chelators of iron.
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Primary leaves of 7- to 9-day-old etiolated seedlings of Phaseolus vulgaris L. var. Red Kidney infiltrated in darkness with aqueous solutions of alpha, alpha'-dipyridyl, o-phenanthroline, pyridine-2-aldoxime, pyridine-2-aldehyde, 8-hydroxyquinoline, or picolinic acid synthesize large amounts of
Transcriptomic analysis of the phytotoxic effects of 1-allyl-3-methylimidazolium chloride on the growth and plant hormone metabolic pathways of maize (Zea mays L.) seedlings.
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In this study, we investigated the phytotoxicity of an imidazolium-based ionic liquid, 1-allyl-3-methylimidazolium chloride ([Amim]Cl), against maize seedlings. It was found that in response to an increase in [Amim]Cl treatment concentrations, there were significant decreases in growth parameters
A Low Molecular Weight Polypeptide Which Accumulates upon Inhibition of Porphyrin Biosynthesis in Maize.
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Levulinic acid, an inhibitor of porphyrin biosynthesis, causes marked accumulation of a low molecular weight polypeptide in greening maize (Zea mays L.) leaves. Additional compounds which interfere with porphyrin synthesis (e.g. aminooxyacetate, iron-chelators, 4,6-dioxoheptanoic acid) had a similar
A Foxtail mosaic virus Vector for Virus-Induced Gene Silencing in Maize.
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Plant viruses have been widely used as vectors for foreign gene expression and virus-induced gene silencing (VIGS). A limited number of viruses have been developed into viral vectors for the purposes of gene expression or VIGS in monocotyledonous plants, and among these, the tripartite viruses Brome
Development of an experimental model for the study of hexachlorobenzene-induced hepatic porphyria in the rat.
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Hexachlorobenzene (HCB) induces hepatic porphyria in rats. Various protocols of repeated cumulative and daily doses of HCB administered for several weeks until porphyria develops have been traditionally used. In order to undertake studies on early biochemical events occurring in HCB-induced
Dose-response relationships in hexachlorobenzene-induced porphyria.
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The rate of development of hexachlorobenzene (HCB)-induced porphyria in female Wistar rats was determined using HCB dosage and porphyrin analysis protocols designed to determine factors which contribute to the delay commonly observed between initial exposure to HCB and the detection of porphyria.
The delay in polyhalogenated aromatic hydrocarbon-induced porphyria: the effect of diet preparation.
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Porphyria development in female Wistar rats has been followed by dosing the animals with hexachlorobenzene (HCB) either dissolved in corn oil or as a solid mixed with the diet. It was found that the corn oil preparation resulted in much faster uptake of HCB into the liver, and much faster
Binding and glutathione conjugation of porphyrinogens by plant glutathione transferases.
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Overexpression in Escherichia coli of a tau (U) class glutathione transferase (GST) from maize (Zea mays L.), termed ZmGSTU1, caused a reduction in heme levels and an accumulation of porphyrin precursors. This disruption was highly specific, with the expression of the closely related ZmGSTU2 or
Alternative Routes for the Synthesis of 5-Aminolevulinic Acid in Maize Leaves : I. Formation from 2-Ketoglutarate via 4,5-Dioxovaleric Acid.
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Cell-free extracts from greening maize (Zea mays L.) leaves catalyze the conversion of [(14)C]2-ketoglutarate (KG) to [(14)C]5-aminolevulinic acid (ALA) in a reaction which requires NADH and an amino donor and shows maximal activity around pH 6.5. The enzymic system is located in the cytosol. This
NTP Toxicology and Carcinogenesis Studies of 1,4-Dichlorobenzene (CAS No. 106-46-7) in F344/N Rats and B6C3F1 Mice (Gavage Studies).
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1,4-Dichlorobenzene is commonly used as a space deodorant in toilets and for moth control. Because of its extensive production and use and the absence of carcinogenicity data, carcinogenesis studies were conducted by administering 1,4-dichlorobenzene (greater than 99% pure) in corn oil by gavage (5
Studies of chloroplast development in four maize mutants defective in chlorophyll biosynthesis.
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Four mutants of maize (Zea mays L.) defective in chlorophyll biosynthesis have been analyzed with regard to the sites of their lesions and their effects on chloroplast development. Two yellow mutants, which accumulate no detectable porphyrin precursors when grown in darkness, are defective in the
Enhanced regional expression of glutathione S-transferase P1-1 with colocalized AP-1 and CYP 1A2 induction in chlorobenzene-induced porphyria.
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A distinct, nonfocal expression pattern was observed for glutathione S-transferase P1-1 (rGSTP1-1) in rats exposed to either hexachloro-(HCB) or pentachlorobenzene (PeCB). The nonfocal expression was localized to the centrilobular region with the most intense staining nearest the central vein. A
Janus-Faced Nature of Light in the Cold Acclimation Processes of Maize.
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Exposure of plants to low temperature in the light may induce photoinhibitory stress symptoms, including oxidative damage. However, it is also known that light is a critical factor for the development of frost hardiness in cold tolerant plants. In the present work the effects of light during the
NTP technical report on the toxicology and carcinogenesis studies of beta-myrcene (CAS No. 123-35-3) in F344/N rats and B6C3F1 mice (Gavage studies).
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Beta-myrcene, an acyclic unsubstituted monoterpene, and the essential oils which contain it are used as intermediates in the production of terpene alcohols (geraniol, nerol, and linalool), which, in turn, serve as intermediates in the production of aroma and flavor chemicals. Thus beta-myrcene is
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