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Sayfa 1 itibaren 16 Sonuçlar
Toxicology and Carcinogenesis Studies of g-Butyrolactone (CAS No. 96-48-0) in F344/N Rats and B6C3F1 Mice (Gavage Studies).
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g-Butyrolactone is an intermediate in the synthesis of polymers used as film formers in hair sprays, blood plasma extenders, and clarifying agents in beer and wine. Toxicology and carcinogenesis studies were conducted by administering g-butyrolactone (greater than 97% pure) in corn oil by gavage to
Determination of pesticide residues by GC-MS using analyte protectants to counteract the matrix effect.
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An analytical method was developed to determine pesticides of various chemical classes in soil, juice and honey using analyte protectants to counteract the enhancement of the chromatographic response produced by the presence of matrix components (matrix effect). This effect was more pronounced for
Artificially increased ascorbate content affects zeaxanthin formation but not thermal energy dissipation or degradation of antioxidants during cold-induced photooxidative stress in maize leaves.
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Infiltrating detached maize (Zea mays L.) leaves with L-galactono-1,4-lactone (L-GAL) resulted in a 4-fold increase in the content of leaf ascorbate. Upon exposure to high irradiance (1000 mumol photons m-2 s-1) at 5 degrees C, L-GAL leaves de-epoxidized the xanthophyll-cycle pigments faster than
Toxicology and Carcinogenesis Studies of 8-Methoxypsoralen (CAS No. 298-81-7) in F344/N Rats (Gavage Studies).
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Oral administration of 8-methoxypsoralen followed by exposure to longwave ultraviolet light (primarily ultraviolet A, 320-400 nm) is used in the treatment of vitiligo and psoriasis. 8-Methoxypsoralen also occurs naturally in a variety of vegetables. Toxicology and carcinogenesis studies of
Transcriptome-based analysis of the Pantoea stewartii quorum-sensing regulon and identification of EsaR direct targets.
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Pantoea stewartii subsp. stewartii is a proteobacterium that causes Stewart's wilt disease in corn plants. The bacteria form a biofilm in the xylem of infected plants and produce capsule that blocks water transport, eventually causing wilt. At low cell densities, the quorum-sensing (QS) regulatory
NTP Toxicology and Carcinogenesis Studies of 3,4-Dihydrocoumarin (CAS No. 119-84-6) in F344/N Rats and B6C3F1 Mice (Gavage Studies).
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3,4-Dihydrocoumarin was nominated by the Food and Drug Administration and the National Cancer Institute for study because of its widespread use as a flavoring agent in beverages, gelatins, puddings, candy, and other food items; as a fragrance in perfumes, creams, and cosmetics; and because of
Pharmacokinetics of all-trans retinoyl beta-glucuronide in rats following intraperitoneal and oral administration.
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The purpose of this study was to examine the pharmacokinetics of a single dose (6.3 mumol, 3 mg) of all-trans retinoyl beta-glucuronide (RAG), when given either orally in corn oil or by intraperitoneal (i.p.) injection in dimethylsulfoxide (DMSO) to adult Sprague-Dawley rats. Following dosing,
Genotoxicity of the natural cercaricides "sucupira" oil and eremanthine in mammalian cells in vitro and in vivo.
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"Sucupira" oil and the lactone eremanthine, extracted from Pterodon pubescens and Eremanthus elaeagnus, respectively, are known for their cercaricidal action in experimental animals. Because of their biological effect, they have the potential to be used for the prophylaxis of schistosomiasis caused
NTP Toxicology and Carcinogenesis Studies of Coumarin (CAS No. 91-64-5) in F344/N Rats and B6C3F1 Mice (Gavage Studies).
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Coumarin is the basic structure of numerous naturally occurring compounds with important and diverse physiological activities. More than a thousand coumarin derivatives have been described, varying from simple coumarins containing alkyl and hydroxyl side chains to complex coumarins with benzoyl,
Ubiquitous presence of beta-glucuronidase (GUS) in plants and its regulation in some model plants.
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The enzyme beta-glucuronidase (GUS) is well characterized in animals and microbes. However, this enzyme is not well studied in plants and is widely assumed to be absent in them. In this study we document the ubiquitous presence of GUS in the model plants Arabidopsis thaliana, Oryza sativa, Nicotiana
Contribution of lymphatic transport to the systemic exposure of orally administered moxidectin in conscious lymph duct-cannulated dogs.
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Moxidectin, a macrocyclic lactone (ML), is a potent parasiticide widely used in veterinary medicine and currently under development for use in humans. The contribution of the lymphatic route to the intestinal absorption and transport of moxidectin to the systemic circulation was evaluated in lymph
Pantoea stewartii subsp. stewartii: lessons learned from a xylem-dwelling pathogen of sweet corn.
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Pantoea stewartii subsp. stewartii is a Gram-negative enteric bacterium that primarily infects sweet corn. Studies of this bacterium have provided useful insight into how xylem-dwelling bacteria establish themselves and incite disease in their hosts. Pantoea stewartii subsp. stewartii is a
Toxicology and carcinogenesis studies of Ginkgo biloba extract (CAS No. 90045-36-6) in F344/N rats and B6C3F1/N mice (Gavage studies).
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Ginkgo biloba extract has been used primarily as a medicinal agent in the treatment or prevention of cardiovascular and cerebrovascular dysfunction. Ginkgo biloba extract was nominated for study by the National Cancer Institute because of its widespread use as an herbal supplement to promote mental
Revealing strategies of quorum sensing in Azospirillum brasilense strains Ab-V5 and Ab-V6.
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Azospirillum brasilense is an important plant-growth promoting bacterium (PGPB) that requires several critical steps for root colonization, including biofilm and exopolysaccharide (EPS) synthesis and cell motility. In several bacteria these mechanisms are mediated by quorum sensing (QS) systems that
Analyzing the Transcriptomes of Two Quorum-Sensing Controlled Transcription Factors, RcsA and LrhA, Important for Pantoea stewartii Virulence.
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The Gram-negative proteobacterium Pantoea stewartii subsp. stewartii causes wilt disease in corn plants. Wilting is primarily due to bacterial exopolysaccharide (EPS) production that blocks water transport in the xylem during the late stages of infection. EsaR, the master quorum-sensing (QS)
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