The response of normal and iron anemic calves to nasal infection with an attenuated strain of parainfluenza-3 virus.

Calves with experimentally induced iron deficiency anemia and normal calves, both groups deprived of colostrum, were exposed to intranasal instillation of an attenuated parainfluenza-3 virus strain.The calves became infected, but there was no difference in the clinical picture between the 2 groups of calves. Neither was there a difference in the humoral or local immune response to parainfluenza-3 virus.     

胭脂萝卜新品种胭脂红3号的选育

胭脂红3 号是以不育系09S77A 为母本，以自交系0484B 为父本配制而成的胭脂萝卜一代杂种。播种至收获100～120 d（天），羽状裂叶，叶片绿色，叶柄及叶脉紫红色；肉质根短圆锥形，皮紫红色，肉深红色，横径7 cm 左右，纵径8 cm 左右，单根质量250 g 左右，色素含量17‰左右；每667 m² 产量1 800 kg 左右，适宜重庆地区作色素提取和泡菜加工品种栽培。     

Probabilistic model for estimating field mortality of target and non-target bird populations when simultaneously exposed to avicide bait

A probabilistic model was developed to estimate target and non-target avian mortality associated with the application of the avicide CPTH (3-chloro-p-toluidine hydrochloride) to minimize sprouting rice damage in the southern USA. CPTH exposures for individual birds were predicted by random sampling from species-specific non-parametric distributions of bait seed consumption and CPTH residues detected on individual bait seeds. Mortality was predicted from the species-specific exposure versus mortality relationship. Individual variations in this response were captured in the model by Monte Carlo sampling from species-specific distributions of slopes and median toxicity values (LD50) for each bird. The model was used to simultaneously predict mortality (percentage of exposed population and number of birds killed/weight of consumed bait) for a target (blackbird) and non-target (mourning dove) species feeding on bait sites for up to five consecutive days.     

Development of sequence tagged site markers to identify races of Fusarium oxysporum f. sp. lactucae

By random amplified polymorphic DNA (RAPD) analysis of the representative isolates of each race of Fusarium oxysporum f. sp. lactucae, RAPD fragments of 0.6, 1.6, and 2.9kb were obtained. The 0.6-kb RAPD fragment was common to the representative isolates of all three races. Amplification of the 1.6- and 2.9-kb fragments were unique to the isolates of races 1 and 2, respectively. Sequence tagged site (STS) marker FLA0001, FLA0101, and FLA0201 were generated from the 0.6-, 1.6-, and 2.9-kb RAPD fragments, respectively. Polymerase chain reaction (PCR) analysis showed that FLA0001 was common to all 49 isolates of F. oxysporum f. sp. lactucae. FLA0101 was specifically generated from all 23 isolates of race 1 but not from races 2 or 3. FLA0201 was specifically amplified from all 12 isolates of race 2 but not from races 1 or 3. In two isolates of F. oxysporum f. sp. lactucum, PCR amplified FLA0001 and FLA0101 but not FLA0201. On the other hand, these STS markers were not detected from isolates of five other formae speciales. Because these STS markers were not generated from isolates of other plant pathogenic fungi, bacteria, or plant materials examined in this study, PCR analysis combined with the three STS markers should be a useful means for rapid identification of races of F. oxysporum f. sp. lactucae.     

Clostridium perfringens toxin-types in lambs and kids affected with gastroenteric pathologies in Italy

A study was carried out in the South of Italy to assess the role of clostridia in neonatal diseases of lambs and kids. Eighty-seven lambs and 15 kids belonging to 25 flocks were examined and Clostridium perfringens was the microorganism most commonly identified. C. perfringens isolates were analysed by polymerase chain reaction (PCR), in order to determine the prevalence of the genes cpa, cpb, cpb2, etx, iap and cpe. The most prevalent toxin-type of C. perfringens was found to be type A found in 84% of the cases with clostridial enterotoxaemia. No C. perfringens type B, C or E were found. C. perfringens type D was isolated in 16% of the cases. About 24% of the isolates were cpb2 positive. The prevalence of cpb2 across the different C. perfringens types varied. The beta(2)-toxin gene cpb2 was detected in 4/21 (19%) type A isolates, in 1/2 type D isolates, and in 1/2 type DE (cpe-carrying type D) isolates. The high rate of positivity to cpb2 among the isolates suggests that a vaccine based on the beta(2)-toxin, should be included in the vaccination schedule of the animals to confer adequate protection and to prevent the disease.     

猪血清中天然LFA－3存在的探讨

测定了正常猪血清对ＳＲＢＣ的溶血作用。并根据猪血清对ＳＲＢＣ的破坏作用经ＳＲＢＣ吸收和加入ＳＲＢＣＬＦＡ－３后即显著降低或消失，提出了猪血清破坏ＲＢＣ的作用与血清中游离ＣＤ＿２的存在有关的论断。此外，又根据反复解离和经ＳＲＢＣ吸收后的猪血清具有阻止正常猪血清对ＳＲＢＣ的破坏作用和猪ＰＢＭＣＥ玫瑰花环的形成，认为猪血清中可能存在天然的ＬＦＡ－３，进而对血清游离ＣＤ＿２在淋巴细胞激活中的功能提出了“游离ＣＤ＿２调控途径”的设想。     

Epidermotropic Cutaneous T-Cell Lymphoma (mycosis fungoides) in Syrian Hamsters (Mesocricetus auratus). A Report of Six Cases and the Demonstration of T-Cell Specificity

Abstract— Epidermotropic cutaneous T-cell lymphoma was diagnosed in six Syrian hamsters (Mesocricetus auratus) with a generalised dermatosis characterised by pruritus, alopecia and exfoliative erythroderma. Plaques and nodules were evident in one animal. Clinical and histopathological findings were suggestive of mycosis fungoides and electron microscopical investigations in one case were supportive. Immuno-histochemical stains for CD3 antigen were strongly positive in all cases. Résumé— Un lyphome T cutané a été diagnostiqué chez six hamsters de Sibérie (Mesocricetus auratus) avec une dermatose généralisée, caractérisée par un prurit, une alopécle et une érythrodermie exfoliative. Des plaques et des nodules ont été observées sur un animal. Les données cliniques et histopathologiques étaient évocatrices d'un mycosis fungoïdes et les examens en microscopie électronique étaient compatibles dans un cas. Les marquages immuno-histochimiques de l'antigène CD3 étaient très positifs dans tous les cas. Zusammenfassung— Bei sechs Syrischen Goldhamstern (Mesocricetus auratus) wurde ein epidermotropes kutanes T-Zell-Lymphom mit einer generalisierten Dermatose diagnostiziert, die durch Pruritus, Alopezie und eine exfoliative Erythrodermie gekennzeichnet war. Bei einem Tier traten auch Plagues und Knoten auf. Die klinischen und histopathologischen Befunde deuteten auf Mycosis fungoides hin. Elektronenmikroskopische Untersuchungen unterstützten diesen Verdacht in einem Fall. Immunhistochemische Färbungen auf CD3-Antigen waren bei alien Fallen stark positiv. Resumen En un grupo de seis hamsters de siria, (Mesocricetus auratus), se diagnosticó limfoma epidermotrópico cutáneo de linfocitos T, presentando una dermatosis generalizada de tipo pruriginoso, acompañada de alopecia y eritroderma exfoliativo. Las placas y nódulos fueron evidentes en uno de los animales. Los estudios clinicos e histopatológicos indicaron una micosis fungoide, y las investigaciones de microscopía, en uno de los caseos, pareció indicar lo mismo. La tintura inmuno-histoquimica para el antígeno CD3 resultó claramente positiva en todod los casos.     

五种寡毛实蝇幼虫的染色体组型鉴别研究

枯小实蝇 Dacus(Bactrocera) dorsalis,芒果实蝇 Dacus(Bactrocera) occipitalis,番石榴实蝇 Dacus(Bactrocera) correctus,南瓜实蝇 Dacus(Zeugodacus) tau,和瓜实蝇 Dacus(Zeugodacus) cucurbitae 等5种寡毛实蝇3龄幼虫的脑细胞染色体组型,其染色体数目为12者居多,可配染色体均分别为5对,另1对为性染色体。根据试验结果显示,5种实蝇3龄幼虫的染色体组型有不同。     

Hypophosphatemia induced by dietary aluminium hydroxide supplementation in pigs: effects on growth, blood variables, organ weights and renal morphology

Twenty-four pigs, 13-14 weeks of age, were studied during an experimental period of 10 weeks. The pigs were randomly divided into 3 groups. Two groups were fed a commercial feed supplemented either with a suspension of aluminium hydroxide (Al(OH)₃) or aluminium phosphate (A1PO₄). The third group served as a control. The same total amount of aluminium was given to each of the 2 experimental groups. After three weeks the Al(OH)₃-pigs developed severe hypophosphatemia, with an average decrease in serum phosphate of 60%, a decreased growth rate and a lower concentration of 2,3-diphosphoglycerate in the erythrocytes as compared to controls. Intense hypercalcemia developed in the Al(OH)₃-group during the first 6 weeks, whereas the AlPO₄-pigs and the control group developed neither hypophosphatemia nor hypercalcemia. At necropsy, the consequence of the long lasting hypophosphatemia was found to be increased relative kidney weights with morphological signs of tubular damage and dyscalcification. No similar changes were observed in the AlPO₄-groups and there were no organ weight deviations compared to the control group.     

玉米渣(含亚硫酸)作饲料的毒性病理学研究

试验表明,猪和乳牛用玉米渣(每公斤湿重含亚硫酸156.78±31.46mg)代替50％标准日粮分别喂饲214天和4个月,可出现与自然病例一致的病变。其特征为胃肠道发生慢性卡他性炎,脾白髓组织萎缩,脾与淋巴结含铁血黄素沉着,肾小管扩张,肝细胞变性,猪有灰质脑软化。揭示这些变化为家畜饲喂残留亚硫酸的玉米渣所引起的慢性中毒提供诊断依据。用添加0.35％HSO_3-的日粮喂猪和小鼠的阳性对照试验表明,玉米渣对动物所产生的上述病变,是由其中残留的亚硫酸所致。