Food insecurity among refugee families in East London: results of a pilot assessment     

Sellen DW  Tedstone AE  Frize J 《Public health nutrition》2002,5(5):637-644

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Uniformly (14)C-ring-labeled 2,4-dichlorophenoxyacetic acid: a metabolism study in bluegill sunfish, Lepomis macrochirus.     

D E Barnekow  N D Premkumar  S Stewart  A W Hamburg 《Journal of agricultural and food chemistry》2001,49(6):2853-2859

The fate of 2,4-dichlorophenoxyacetic acid (2,4-D), a mixture of [phenyl(U)-(14)C]-2,4-D and unlabeled 2,4-D, in bluegill sunfish was investigated after exposure to approximately 11 ppm under static conditions for 4 days. Total radioactive residues (TRR) in whole fish increased from 0.41 ppm on day 1 to 0.60 ppm on day 3. TRR levels in fillet (edible) and viscera (nonedible) of treated fish on day 4 were 0.41 and 1.9 ppm, respectively. Most residues in both matrices were acetonitrile soluble; small amounts were hexane soluble or unextractable with solvents. Acid and base hydrolyses with ethyl acetate partitioning were used to release the fillet unextractable residues. The identification of 2,4-D and 2,4-dichlorophenol (2,4-DCP) in the fillet was conclusively confirmed by GC-MS analysis. On the basis of the experimental data from this study, a metabolic pathway for 2,4-D in bluegill sunfish in which the 2,4-D is metabolized to 2,4-DCP and conjugates of 2,4-D and 2,4-DCP is proposed.  相似文献   

Endosulfan persistence in soil and uptake by potato tubers   总被引：2，自引：0，他引：2  

D K Stewart  K G Cairns 《Journal of agricultural and food chemistry》1974,22(6):984-986

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AN APPARATUS FOR REMOVAL OF DELETERIOUS BACTERIA FROM CERTAIN PROTOZOAN CULTURES     

Stewart W 《Science (New York, N.Y.)》1939,89(2317):492

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APPARATUS TABLES FOR ELECTRICAL LABORATORIES     

Stewart GW 《Science (New York, N.Y.)》1905,22(559):344-345

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Carboxyhemoglobin concentrations in blood from donors in Chicago, Milwaukee, New York, and Los Angeles     

R D Stewart  E D Baretta  L R Platte  E B Stewart  J H Kalbfleisch  B Van Yserloo  A A Rimm 《Science (New York, N.Y.)》1973,182(119):1362-1364

To determine the carbon monoxide exposure experienced by the residents of Chicago, Los Angeles, Milwaukee, and New York, venous blood samples were obtained from adults at arbitrarily chosen blood bank collection sites in the four cities and analyzed for circulating carbon monoxide, carboxyhemoglobin. For comparative purposes, blood was obtained from volunteers breathing carbon monoxide-free air and was found to contain 0.45 percent carboxyhemoglobin. By contrast a high percentage of all the nonsmoking blood donors breathing city air had carboxyhemoglobin saturations greater than 1.5 percent, which indicated that exposure to carbon monoxide in excess of that permitted by the quality standards of the Clean Air Act of 1971 was widespread and occurring regularly.  相似文献   

Inhibition of Mitotic Poisoning by meso-Inositol     

Chargaff E  Stewart RN  Magasanik B 《Science (New York, N.Y.)》1948,108(2812):556-558

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H. G. Wells Predicts     

Stewart B 《Science (New York, N.Y.)》1955,121(3147):614

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Reformation of functional liver polyribosomes from ribosome monomers in the absence of RNA synthesis   总被引：2，自引：0，他引：2  

G A Stewart  E Farber 《Science (New York, N.Y.)》1967,157(784):67-69

The administration to rats of the ethyl analog of methionine, ethionine, results in the rapid decrease in the hepatic concentration of adenosine triphosphate followed by an extensive disaggregation of polysomes to ribosome monomers and a concomitant inhibition of protein synthesis. These effects are readily reversed by the injection of methionine or precursors of adenine nucleotides such as adenine. The reformation of liver polyribosomes in such animals following the administration of adenine plus methionine was found to occur under conditions in which new RNA synthesis was markedly inhibited. Free messenger RNA without attached ribosomes must be capable of remaining functionally active in the liver cytoplasm for many hours.  相似文献   

Genetic regulation of conidiation in Trichoderma hamatun          下载免费PDF全文

Johanna Steyaert　 Travis Glare　 Alison Stewart　 Margaret Carpenter　 Hayley Ridgway 《浙江大学学报(农业与生命科学版)》2004,30(4):442-442

Achieving a balance between vegetative growth and spore production is essential for successful biocontrol by fungi. Low sporulation rates in the field can result in poor establishment and survival,whereas failure of conidia to recognise hosts can lead to persistence without efficacy. Commercial biocontrol products involve bulk preparations of conidia, however considerable variability in conidiation rates exists between biocontrol agents, which can restrict choice of strain for production. The majority of studies on Trichoderma conidiation have focused on the species T. viride and T. atroviride.These species form conidia in response to blue and near-UV light and/or nutrient deprivation and conidiation proceeds in a highly co-ordinated fashion, however relatively little is known on the genetic basis of Trichoderrma conidiation. In addition, whilst photoconidiation appears to be a general response detailed studies in other Trichoderma species are absent. In this study, conidiation in the lesser known biocontrol species T. hamatum is being investigated using a combined morphological and molecular approach. In contrast to T. atroviride, conidiation in response to blue-light was weaker and variable and suggested that additional triggers may be required for the T. hamatum photoresponse. A series of comparative photoconidiation assays are currently being undertaken investigating the effect of inoculum type and abiotic factors on timing and intensity of the response.Results will be discussed in relation to the current knowledge on conidial morphogenesis in Trichoderma. In addition to these morphological assays, a selection of genes implicated in sporulation and the blue-light responses are currently being isolated and characterised from T. hamatum. Two genes, phr1 and cmp1 , which were isolated previously from T. atroviride will be used as early and late markers of gene expression during the photoresponse in T. hamatum in order to define time points for harvesting comparable stage-specific RNA from T. hamatum and T. atroviride. Using degenerate PCR putative sporulation gene orthologues have also been identified in T. hamatum.Work is currently underway to isolate genomic clones of these genes from T. hamatum and T.atroviride. Sequence and expression analysis of orthologues, including expression in response to abiotic factors will be presented and discussed in relation to the current knowledge of the molecular basis of conidiation in Trichoderma and other filamentous fungi.……  相似文献