The Foot and Mouth Disease Virus Type O Outbreak of 1992 Is Not Related to Vaccine Strain (O/R2/75)

Vaccination is the only pragmatic approach to control foot and mouth disease in India. Strict quality control measures are essential to supply potent vaccine to the field application, in addition to monitoring the performance of the vaccine in the field. During the process of monitoring, an outbreak of FMD in vaccinated animals caused by type “O” virus in Tanjavur district of Tamil Nadu and a type “O” virus from unvaccinated herd of Karnataka were studied. Field isolates and vaccine virus were sequenced and analyzed. Data indicated that the virus from the outbreak in vaccinated cattle was a variant which could escape neutralization by antibodies against vaccine virus. This revised version was published online in August 2006 with corrections to the Cover Date.     

Ecotropic and dualtropic mink cell focus-inducing murine leukemia viruses can induce a wide spectrum of H-2 controlled lymphoma types

Neonatal infection of C57BL and BALB/c mice by cloned ecotropic and dualtropic mink cell focus-inducing (MCF) murine leukemia viruses (MuLV) induces a wide spectrum of different lymphomas of T, B, and non-T/non-B cell types. Oncogenic dualtropic MCF viruses and poorly oncogenic ecotropic MuLV act synergistically in lymphomagenesis. Within one mouse strain virus-induced T-cell lymphomas arise earlier than B-cell lymphomas after neonatal inoculation of a single-cloned MuLV. The host genetic constitution, notably the H-2 complex has a marked influence on lymphoma type. This H-2 influence can be explained by an H-2-linked difference in penetration of the thymus early in life by oncogenic thymotropic MuLV, which in turn is correlated with, but not necessarily due to the magnitude of the anti-MuLV antibody response.     

Stimulus range influences intensity and hedonic ratings of flavour

Five concentrations of an artificial orange drink were presented for sensory evaluation in three overlapping concentration ranges. Three sensory panels, each of 30 subjects, rated the concentrations for intensity of flavour (intensity scale), relation to ideal flavour intensity (ideal-point scale), and pleasantness (hedonic scale). Except for the two extreme concentrations, neither of which was presented in more than one range, in all three response tasks the mean rating for a given concentration varied with the concentration range in which it was presented. However, the mean ratings showed good correspondence across response tasks (e.g. the concentration perceived as "moderately sweet" on the intensity scale was perceived as "just right" on the ideal-point scale and of maximal pleasantness on the hedonic scale), suggesting a link between the intensity and hedonic dimensions of sensory experience.     

Metabolic response to experimental trauma: the time relation of post-traumatic protein metabolism

The relationship between time and the post-traumatic metabolic response was studied in a commonly used experimental model of trauma. Twenty nine rats underwent laparotomy and jugular vein sham catheterization as the standard trauma. The rats were fed ad libitum and compared to pair fed controls in terms of nitrogen balance and liver protein synthesis. The pairs of rats were divided into three groups according to the duration of the experiment, which was 24 h, 48 h or 72 h. The nitrogen balance was calculated daily and the liver protein synthesis in vitro measured in 10 rats after 48 h with an asanguinous perfusion system using L-(1-C(14))-Leucine. The metabolic effect of trauma was first detected in liver protein synthesis, which was diminished in the early post-traumatic period (percentage synthesis rates: post-traumatic 34.6 +/- 10.7 and pair fed 60.4 +/- 21.3, Mean +/- SD, P < 0.05). During this period the whole body nitrogen balances were similar (post-traumatic -1.200 +/- 1.440 and pair fed -0.880 +/- 1.130, gN/kg/48 h, mean +/- SD). On the third day, the response to nitrogen intake and the nitrogen balance became significantly worse in the post-traumatic rats (post-traumatic 0.214 +/- 1.680 and pair fed 1.236 +/- 1.220, gN/kg/day, mean +/- SD). These observations suggest that, firstly, the 'flow' phase has its onset on the third post-trauma day, and secondly that trauma does decrease liver protein synthesis, and this decrease lasts at least through the 'ebb' phase. The results indicate the necessity of defining the metabolic phase in experimental studies of post-traumatic metabolism.     

杂多化合物九钨三钛硅酸盐致畸毒性研究

目的 :观察九钨三钛硅酸盐 ( α- K8H2 〔Si W9Ti3 O4 0 〕· 1 5H2 O,简称 α- Ti3 )孕期给药对大鼠胎仔的毒性影响。方法 :大鼠孕期以 57.0 9,1 71 .2 8和 51 3.83mg/ kg剂量经口给予α- Ti3 ,并以Vit A为阳性对照及蒸馏水为阴性对照 ,产前剖腹检测胎鼠生长发育指标、外观内脏骨骼形态等。结果 :三个剂量组均未见胎鼠外观、内脏及骨骼畸形。低剂量组与高剂量组的活胎率升高 ,吸收胎数下降 ,与阴性对照组比较有显著性差异 (均为 P<0 .0 5)。低、中、高剂量组的胎鼠体重和身长高于阴性对照组 (分别为 P<0 .0 5,P<0 .0 1 ,P<0 .0 1 ) ,且增长程度与剂量呈正相关 ( r=0 .840 8,0 .72 2 8,P<0 .0 0 5,0 .0 5)。低、中、高三个剂量组的上枕骨骨化程度及胸骨块数高于阴性对照组和阳性对照组 ( P<0 .0 5,0 .0 1 ,0 .0 1 ,0 .0 5和 P<0 .0 5,0 .0 1 ,0 .0 1 )。各剂量组的母鼠肝脏重量及肝体比值不同程度下降。其中 ,中、高剂量组及阳性对照组的肝重及肝体比值与阴性对照组比较差异显著 (肝重比较分别为 P<0 .0 5,P<0 .0 5和 P<0 .0 1 ,肝体比值比较均为 P<0 .0 5)。结论 :α- Ti3 致畸试验未见胎鼠畸形 ,但可提高胎鼠生长发育指标和骨骼骨化程度。     

Overexpression of Bcl-2 partly inhibits apoptosis of human ce rvical cancer SiHa cells induced by arsenic trioxide

ＳｏｍｅｒｅｓｅａｒｃｈｅｒｓｆｒｏｍｔｈｅＨａｒｂｉｎＭｅｄｉｃａｌＵｎｉｖｅｒｓｉｔｙａｎｄｔｈｅＳｈａｎｇｈａｉＳｅｃｏｎｄＭｅｄｉｃａｌＵｎｉｖｅｒｓｉｔｙｒｅｐｏｒｔｅｄｔｈａｔａｒｓｅｎｉｃｔｒｉｏｘｉｄｅ (Ａｓ2 Ｏ3)ｉｓａｎｉｄｅａｌｃｌｉｎｉｃａｌｃｏｍｐｏｕｎｄｆｏｒｔｒｅａｔｍｅｎｔｏｆａｃｕｔｅｐｒｏｍｙｅｌｏｃｙｔｉｃｌｅｕｋｅｍｉａ (ＡＰＬ)ａｎｄｉｔｃｏｕｌｄｉｎｄｕｃｅａｐｏｐｔｏｓｉｓｏｆＮＢ4ｃｅｌｌｓ 1 3　Ｔｈｒｏｕｇｈｉｎｖｉｔｒｏａｎｄｉｎｖｉｖｏｅｘｐｅｒ…     

三氧化二砷对肝癌细胞系HepG2生长及核基质蛋白的影响

目的 探讨三氧化二砷对人肝癌细胞系ＨｅｐＧ２的生长及核基质蛋白的影响。方法 应用生长指数分析和高分辨ＳＤＳ－聚丙烯酰胺交双向电泳比较用Ａｓ２Ｏ３处理后的ＨｅｐＧ２细胞主核基质蛋白的改变。结果 Ａｓ２Ｏ３抑制ＨｅｐＧ２的生长,双向电泳显示经Ａｓ２Ｏ３处理后ＨｅｐＧ２细胞内出现新的核基质蛋白,并且该蛋白是细胞特异性的。结论 核基质蛋白是某些抗癌药物的作用靶子,Ａｓ２Ｏ３抑帛 癌细胞的生长可望有用于临床     

急性白血病患者MGMT基因突变的研究

目的研究甲基鸟嘌呤－脱氧核糖核酸－甲基转移酶（ＭＧＭＴ）基因突变与急性白血病发病的关系。方法应用聚合酶链反应－单链构象多态性（ＰＣＲ－ＳＳＣＰ）技术对６２例急性白血病中ＭＧＭＴ基因进行了突变分析。结果ＭＧＭＴ基因突变在急性白血病中为１４．５％。结论急性白血病中存在ＭＧＭＴ基因突变,其在急性白血病的发生与发展中起到一定作用。     

食品中分离的李斯特氏菌的致病基因分析

１９９６—１９９７年作者对全国１２个省市的７类食品共３７４６份进行了李斯特氏菌的污染调查,共分离出李斯特氏菌１６５株。用ＰＣＲ技术对分离菌株中李斯特氏菌的２种主要致病因子李氏溶血素Ｏ和内化素的基因进行了检测,其中５７株仅有内化素基因,２７株同时具有内化素基因和李氏溶血素Ｏ基因。两种致病基因均未检出的共有８１株。本研究说明判断单增李氏菌的主要指标是小鼠毒力试验阳性而不是其溶血反应,同时检测溶血素Ｏ和内化素２种基因对单增李氏菌有鉴别意义。