Polynuclear aromatic hydrocarbons,steroids and carcinogenesis     

YANG NC  CASTRO AJ  LEWIS M  WONG TW 《Science (New York, N.Y.)》1961,134(3476):386-387

In addition to the electronic factors, there is a steric factor responsible for the carcinogenicity of polynuclear aromatic hydrocarbons. A carcinogenic polynuclear aromatic hydrocarbon must bear steric resemblance to steroids. One possible implication to this requirement for carcinogenicity is that these hydrocarbons may act on the same sites as steroid hormones.  相似文献   

Unilateral laryngeal paralysis in a cat     

W. T. WONG 《The Journal of small animal practice》1984,25(4):199-202

A case of unilateral laryngeal paralysis in a cat is described which presented with signs of nasal discharge and dyspnoea. The condition is compared with laryngeal paralysis as seen in the horse and dog.  相似文献   

转基因抗病毒病四倍体西瓜的培育   总被引：1，自引：1，他引：1  

黄学森  牛胜鸟  王锡民  于嘉林  赵福兴  王生有  翟光明  蔡晓雨  师范生  曹永刚  许艳  郑芳  王小红  金霞 《中国瓜菜》2007,(6):1-4

利用西瓜花叶病毒2号(WMV-2)外壳蛋白(CP)基因、小西葫芦黄花叶病毒(ZYMV)复制酶(NIb)基因和黄瓜花叶病毒(CMV)复制酶基因构建三价基因的植物表达载体,通过农杆菌介导转化四倍体西瓜植株,经分子检测证明目的基因成功地导入西瓜植株,并在后代中稳定遗传。经温室及大田接种鉴定,T3代转基因西瓜抗病毒性达中抗水平,为抗病毒无籽西瓜新品种的培育提供了可能性。  相似文献   

Suppression of influenza virus infection by the orf virus isolated in Taiwan     

Fong-Yuan LIN  Yeu-Yang TSENG  Kun-Wei CHAN  Shu-Ting KUO  Cheng-Hsiung YANG  Chi-Young WANG  Masaki TAKASU  Wei-Li HSU  Min-Liang WONG 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(9):1055-1062

Orf virus (ORFV), a member of parapoxvirus, is an enveloped virus with genome of double-stranded DNA. ORFV causes contagious pustular dermatitis or contagious ecthyma in sheep and goats worldwide. In general, detection of viral DNA and observing ORFV virion in tissues of afflicted animals are two methods commonly used for diagnosis of orf infection; however, isolation of the ORFV in cell culture using virus-containing tissue as inoculum is known to be difficult. In this work, the ORFV (Hoping strain) isolated in central Taiwan was successfully grown in cell culture. We further examined the biochemical characteristic of our isolate, including viral genotyping, viral mRNA and protein expression. By electron microscopy, one unique form of viral particle from ORFV infected cellular lysate was demonstrated in the negative-stained field. Moreover, immunomodulating and anti-influenza virus properties of this ORFV were investigated. ORFV stimulated human monocytes (THP-1) secreting proinflammatory cytokines IL-8 and TNF-α. And, pre-treatment of ORFV-infected cell medium prevents A549 cells from subsequent type A influenza virus (IAV) infection. Similarly, mice infected with ORFV via both intramuscular and subcutaneous routes at two days prior to IAV infection significantly decreased the replication of IAV. In summary, the results of a current study indicated our Hoping strain harbors the immune modulator property; with such a bio-adjuvanticity, we further proved that pre-exposure of ORFV protects animals from subsequent IAV infection.  相似文献   

Allozyme variation in riverine and lacustrine populations of Macrobrachium nipponense (de Haan)     

J. T. Y. WONG  B. J. McANDREW 《Aquaculture Research》1994,25(4):393-400

Abstract. Allozyme variation at 32 protein genetic loci was studied in four populations of Macrobrachium nipponense (de Haan) from two contrasting habitats, wholly freshwater lacustrine sites and brackish water riverine areas from different parts of Asia (Hong Kong, Canton, Wuhan, Japan). The average values of observed heterozygosity were 7·45% for lacustrine and 12·30% for riverine sites, the percentage of polymorphic loci (0·99) was 32·5%. The freshwater/lacustrine populations had lower estimates of genetic variability than the river/brackish water populations. The average genetic similarity and genetic distance (Nei's) were 0·92 and 0·084 respectively. The results were compared with those of the only other study on this species. The implications of these results for this species are discussed.  相似文献   

Clinical investigations of halothane and isoflurane for induction and maintenance of foal anesthesia     

E. P. STEFFEY  N. WILLITS  P. WONG  S. V. HILDEBRAND  J. D. WHEAT  D. M. MEAGHER  D. HODGSON †  J. R. PASCOE  R. B. HEATH ‡  C. DUNLOP ‡ 《Journal of veterinary pharmacology and therapeutics》1991,14(3):300-309

Fifty-eight foals were divided into two groups for study of aspects of the clinical anesthetic management of foals and to characterize effects of halothane (n = 30) and isoflurane (n = 28) in foals. There were no significant differences (P greater than 0.05) in the demographics of the two groups. Results of hemograms and biochemical analysis of venous blood samples before and after anesthesia were either not influenced or only mildly (clinically unimportant) affected by either agent. Like adult horses, foals have an increased PaCO2 when anesthetized with inhaled anesthetics. We could detect no difference in the magnitude of increase in PaCO2 with either anesthetic. Anesthetic induction and recovery was most rapid with isoflurane. The quality of induction and recovery was similarly acceptable with either agent. Heart rate during isoflurane was not significantly different from conscious conditions but during halothane, heart rate was significantly less than control except at 91-120 min when statistical significance was not detected. These results support the clinical impression that foals can be safely and reliably anesthetized with either agent.  相似文献   

New record of Heterocapsa circularisquama (Dinophyceae) from Hong Kong     

MITSUNORI  IWATAKI  MING WAH  WONG  YASUWO  FUKUYO 《Fisheries Science》2002,68(5):1161-1163

  相似文献   

Intermittment vomiting and weight loss in an old dog     

CR O'BRIEN  WT WONG 《Australian veterinary journal》2001,79(4):251-251

  相似文献   

Retarded leaching of nitrate measured in monolith lysimeters in south-east Nigeria     

M. T. F. WONG  A. WILD  A. S. R. JUO 《European Journal of Soil Science》1987,38(3):511-518

At Onne in South-east Nigeria, drainage water was collected from four monolith lysimeters and analysed for nitrate. The lysimeters contained an acid sandy loam. At the start of the first rainy season two lysimeters received urea labelled with ¹⁵NO₃^– and two received no nitrogen fertilizer; all four were uncropped in the first year.
The peak concentrations of ¹⁵NO₃^– and of unlabelled (soil) NO₃^– were found after 2.5 pore volumes of water had passed through the lysimeters. Using the same soil in the laboratory after fine sieving, the peak concentration of tritiated water was found at 1 pore volume whereas nitrate leaching was retarded. The pattern of nitrate leaching was well described by miscible and immiscible models which included an adsorption coefficient for nitrate. Over the 2 years 81.4% of the ¹⁵N added at the start of the first rainy season was recovered in the drainage water.  相似文献   

城市污泥生物沥滤过程中抑制作用的研究     

陈嘉  李顺鹏  黄焕忠  顾向阳 《南京农业大学学报》2007,30(4):40-45

对好氧剩余污泥重金属生物沥滤过程中可能存在的抑制作用进行了系统研究.结果表明,丽华污泥(取自常州丽华污水处理厂)和城东污泥(苏州城东污水处理厂)及其上清液对氧化亚铁硫杆菌(Acidithiobacillus ferrooxidans)的生长及Fe2 氧化作用均具有强烈抑制作用,而乙酸和丙酸是引起上述抑制作用的主要因子.采用不同固体含量污泥悬液进行模拟培养试验,结果证明污泥中的乙酸和丙酸主要来源于浓缩池内污泥有机质的厌氧分解.在污泥生物沥滤过程中,乙酸和丙酸的存在对Zn的溶出效率没有不利影响,但污泥的酸化速率显著下降,丽华污泥和城东污泥中Cu的沥滤时间分别比对照延长6 d和2 d,严重影响生物沥滤工艺的总体效率.  相似文献