CORN AS AN ETIOLOGICAL FACTOR IN THE PRODUCTION OF A NICOTINIC ACID DEFICIENCY IN THE RAT     

Krehl WA  Teply LJ  Elvehjem CA 《Science (New York, N.Y.)》1945,101(2620):283-284

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Effects of Addition of Tissue‐Type Plasminogen Activator in In Vitro Fertilization Medium on Bovine Embryo Development and Quality          下载免费PDF全文

F Krania  E Dovolou  CA Rekkas  EK Theodosiadou  I Pappas  GS Amiridis 《Reproduction in domestic animals》2015,50(1):112-120

Plasminogen activators/Plasmin system plays pivotal role in regulating reproductive functions of mammals. Here, we examined the effects of modification of in vitro fertilization medium (IVF medium) with the addition of tissue‐type plasminogen activator (t‐PA), on bovine embryo development and quality, assessed by quantification of expression of various genes related to metabolism, oxidation, implantation and apoptosis. In addition, plasminogen activator activity (PAA) and plasminogen activator inhibition (PAI) were measured in the spent media. After conventional IVM, 2016 cumulus‐oocyte complexes (COCs) were divided into four groups with modified composition of the IVF medium containing t‐PA and/or its inhibitor epsilon‐aminocaproic acid (control, t‐PA, t‐PA+ε‐ACA, ε‐ACA). Presumptive zygotes were cultured for 8 days in synthetic oviductal fluid (SOF) medium; gene expression studies were carried out on morulae and blastocysts. t‐PA alone significantly suppressed cleavage and blastocyst formation rates, but this effect was neutralized by the addition of ε‐ACA. PAA in the treated group was significantly reduced by ε‐ACA, but without total elimination. Significant differences were detected in the expression of genes related to apoptosis and/or cell cycle arrest (BAX, BCL2L1, KAT2B) between embryos produced in t‐PA‐modified media and controls, giving an overall notion that the inferior developmental competence of treated embryos may be attributed to apoptotic phenomena induced by t‐PA. In conclusion, it appears that excessive t‐PA content in the IVF media, suppresses blastocyst formation rate, possibly due to induction of apoptotic phenomena.  相似文献   

Molybdenum deprivation,purine ingestion and an astrocyte‐associated motor neurone syndrome in sheep: assumed clinical effects of inosine          下载免费PDF全文

CA Bourke 《Australian veterinary journal》2015,93(3):79-83

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Cerebellar degeneration in goats grazing Solanum cinereum (Narrawa burr)     

CA BOURKE 《Australian veterinary journal》1997,75(5):363-365

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TELANG LIVER AND VITAMIN A TOXICITY     

Herbst EJ  Pavcek PL  Elvehjem CA 《Science (New York, N.Y.)》1944,100(2598):338-339

(1) About 20 per cent. of fresh telang livers were toxic to weanling rats receiving the calcium supplemented livers as their sole dietary. (2) The symptoms observed in rats were growth failure and multiple spontaneous fractures of the bones of the extremities. (3) The toxicity of certain telang livers was due to their abnormally high stores of vitamin A. When these livers, supplemented only with calcium carbonate, were fed to weanling rats, the daily intake of vitamin A was in excess of the toxic dosage of 15,000 I.U. per day. (4) Identical symptoms of toxicity were observed in weanling rats fed 20,000 I.U. of crystalline vitamin A per day in conjunction with a standard stock ration.  相似文献   

镉对鲫非特异性免疫力的影响   总被引：7，自引：2，他引：7  

丁磊  黄鹤忠  吴康  蔡春芳  吴萍 《农业环境科学学报》2004,23(1):64-66

采用毒性实验方法研究了镉对鲫非特异性免疫力的影响,确定镉诱导免疫毒性效应及其毒性参数。在试验剂量和时间范围内的结果显示,镉对鲫白细胞数量(WBC)、中性粒细胞的吞噬率(PR)和补体50%溶血活性(CH50)均有剂量-效应关系、时间-效应关系和Hormesis现象,1.25mg·kg-1注射染Cd2+胁迫时对WBC、PR和CH50有激活作用,2.5和3.75mg·kg-1注射染Cd2+胁迫时对WBC、PR和CH50有抑制作用;WBC顶点所对应的时间为染Cd2+后4d,PR顶点所对应的时间为染Cd2+后2d,CH50顶点所对应的时间为染Cd2+后1d。所以Cd2+对鲫具有明显的免疫毒性。  相似文献   

小鼠血清抗磺胺二甲氧嘧啶抗体的研制   总被引：1，自引：0，他引：1  

曹盛丰 《上海交通大学学报(农业科学版)》2007,25(2):96-98,119

将磺胺二甲氧嘧啶(SDM)与载体牛甲状腺球蛋白(BTG)偶联,构建SDM完全抗原SDM-BTG。用SDM-BTG免疫小鼠,诱导小鼠产生血清抗SDM抗体。ELISA检测表明:SDM-BTG免疫小鼠所产生的多克隆抗体与SDM-BSA包被抗原的结合有较强的特异性和较高的亲和力。  相似文献   

THE FREE TRYPTOPHANE CONTENT OF HUMAN URINE     

Schweigert BS  Sauberlich HE  Elvehjem CA 《Science (New York, N.Y.)》1945,102(2646):275-277

The amount of 1-tryptophane excreted per day by 9 different normal male subjects was determined by a microbiological method with L. arabinosus as the test organism. From 12-30 mg per day were excreted as contrasted to an average value of 281 mg per day reported by Albanese and Frankston. A negligible amount of indole in the urine could be demonstrated. Satisfactory values and recoveries of 1-tryptophane were obtained at different levels of the test sample.  相似文献   

GROWTH STIMULATING PROPERTIES OF GRASS JUICE     

Kohler GO  Elvehjem CA  Hart EB 《Science (New York, N.Y.)》1936,83(2158):445-446

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Predatory Dinosaurs from the Sahara and Late Cretaceous Faunal Differentiation     

PC Sereno  DB Dutheil  M Iarochene  HCE Larsson  GH Lyon  PM Magwene  CA Sidor  DJ Varricchio  JA Wilson 《Science (New York, N.Y.)》1996,272(5264):986-991

Late Cretaceous (Cenomanian) fossils discovered in the Kem Kem region of Morocco include large predatory dinosaurs that inhabited Africa as it drifted into geographic isolation. One, represented by a skull approximately 1.6 meters in length, is an advanced allosauroid referable to the African genus Carcharodontosaurus. Another, represented by a partial skeleton with slender proportions, is a new basal coelurosaur closely resembling the Egyptian genus Bahariasaurus. Comparisons with Cretaceous theropods from other continents reveal a previously unrecognized global radiation of carcharodontosaurid predators. Substantial geographic differentiation of dinosaurian faunas in response to continental drift appears to have arisen abruptly at the beginning of the Late Cretaceous.  相似文献