浅析阿拉善左旗林业有害生物防治现状及应对措施

文章对阿拉善左旗林业有害生物防治现状进行了调查,分析了林业有害生物监测防治工作存在的问题,提出做好林业有害生物防治社会化服务工作应对的措施,对于建立起适应当前林业改革和发展形势需要的林业有害生物防治公共服务保障体系提供了理论依据。     

纳他霉素处理对火龙果贮藏品质的影响

研究不同浓度的纳他霉素对火龙果采后贮藏保鲜效果的影响。以火龙果为试验材料,研究不同浓度(0、400、800、1200 mg/L)纳他霉素对火龙果贮藏期生理、营养指标及果实表面微生物菌落情况的影响。结果表明:与对照相比,不同浓度的纳他霉素处理均可显著降低火龙果呼吸强度,抑制腐烂指数、鳞片黄化率、质量损失率、丙二醛含量的增加,延缓鳞片叶绿素、可溶性固形物、可滴定酸、维生素C含量的降低,提高果实SOD、POD、CAT等抗氧化相关酶活性,在贮藏末期时仍能保持较低的细菌菌落总数、酵母菌和霉菌总数。综合认为,纳他霉素处理可以明显延缓火龙果果实衰老,有效保持果实的贮藏品质,其中以800 mg/L纳他霉素处理效果最佳。     

Estriolum Treatment in the Bitch: A Risk for Uterine Infection?

Purulent vaginal discharge in a bitch in which ovariohysterectomy has been performed is often caused by inflammation of the uterine stump. The inflammation is due to either cystic endometrial hyperplasia (CEH) induced primarily by progesterone from remnant ovarian tissue or exogenous progestagens, or it is due to the presence of unabsorbed suture material. This report describes a 9-year-old Irish setter with hemopurulent vaginal discharge and non-pruritic symmetrical alopecia, which had undergone ovariohysterectomy 3.5 years ago and which had been treated with estriolum daily for the past 2.5 years because of urinary incontinence. Vaginoscopy revealed hemopurulent discharge throughout the vagina and vestibule. Cytological examination of ultrasound-guided fine-needle aspiration biopsies of a large mass in the hypogastricum, which appeared to be the uterine cervical stump, revealed septic purulent inflammation. The concentration of plasma progesterone was low and the concentration of plasma 17-ß oestradiol did not increase after gonadotrophin-releasing hormone administration. No remnant ovarian tissue was found by abdominal ultrasonography, laparotomy, or histological examination of mesovarian pedicles. Laparotomy revealed uterine stump empyema. Histological examination of the surgically removed mass excluded both CEH and unabsorbed suture material as the cause of the stump empyema. Instead, it is hypothesized that the long-term treatment with estriolum was a causative factor. This suggests that bitches treated with estriolum should be examined regularly.     

新疆褐牛细管冻精改良当地蒙古牛效果分析

用新疆褐牛细管冻精为父本,以新疆博尔塔拉州本地蒙古牛为母本进行杂交,即采用人工授精的方法获得杂交F1。褐蒙F1,初生重公犊比蒙古牛提高28．26％,母犊提高27．23％,断奶重公犊提高92．04％,母犊提高92．16％。同龄褐蒙F1屠宰率、净肉率比本地蒙古牛提高6．6％和8％。平均每头褐蒙F1牛可增肉70．3kg,按每千克牛肉25元计算,增效1758元。细管冻精配种可降低成本130元。     

玉屏风多糖脂质体的制备及表征研究

优选玉屏风多糖脂质体的最佳工艺并对其进行表征验证。采用逆向蒸发法制备玉屏风多糖脂质体,以膜材比、脂药比和超声时间为考察因素,包封率为评价指标,采用L9(34)正交试验设计优选制备条件,以超速离心法测定包封率,体外释药试验验证,纳米颗粒分析仪和透射电镜测定其粒径大小与形态。制备玉屏风多糖脂质体的最佳工艺为膜材比8∶1,脂药比4∶1,超声时间90s,包封率88.38%,24h累积释放率73.45%,平均粒径132.65nm。制备的玉屏风多糖脂质体具有较高的包封率与良好的缓释作用,粒径和形态较均匀,重现性好。     

羊附红细胞体巢式PCR检测方法的建立及临床应用

根据GenBank上发表的羊附红细胞体16SrRNA基因序列（登录号AF338268）设计2对引物,用巢式PCR方法扩增16SrRNA的部分序列,将目的片段克隆并测序。测序结果与AF338268相似性达99%以上,只有3bp的差异。该方法与猪附红细胞体、羊肺炎支原体、链球菌、葡萄球菌和大肠杆菌均无交叉反应,能检测到的最低DNA量为25fg。用于检测的28份临床样本中,23份为阳性。所建立的巢式PCR检测方法具有较高的敏感性和特异性,可用于羊附红细胞体病急性感染和隐性感染的早期诊断,为该病的临床检测、流行病学调查、进出口检疫和实验室研究提供了新的技术手段。     

人工感染猪附红细胞体病的病理组织学研究

为观察昆明小鼠人工感染猪附红细胞体后的病理组织学变化。用常规病理学方法,对6只腹腔注射感染猪附红细胞体的小鼠进行病理解剖学和病理组织学研究,光镜下观察并描述小鼠红细胞感染附红细胞体后的形态变化。剖检可见主要器官和皮下瘀血,胸腹部皮下脂肪黄染,病理组织学变化的主要特征是心、肝、脾、肺、肾等主要脏器实质细胞变性、坏死,毛细血管扩张充血、出血,脾窦内含铁血黄素沉着。结果表明,猪附红细胞体感染小鼠模型的成功建立,镜下红细胞的形态特征及主要器官剖检和病理组织学变化与文献报道的猪附红细胞致病特征基本吻合,存在的差异可能与不同地域猪附红细胞体病原株致病性有关。     

Involvement of extracellular signal regulated kinase in the regulation of amyloid precursor protein processing in PC12 cells by TPPB

AIM: To explore the signal transduction pathways involved in the regulation of amyloid precursor protein (APP) processing by protein kinase C (PKC) activator TPPB.METHODS: PC12 cells were treated with TPPB (PKC activator) for 3 h and various signal transduction inhibitors were added to the conditioned medium to investigate their effects on α-secretase form of soluble amyloid precursor protein (sAPPα) secretion after TPPB treatment via Western blotting. Extracellular signal regulated kinase (ERK, p42/44MAPK) and phospho-p42/44MAPK were also measured after TPPB treatment.RESULTS: TPPB (1 μmol/L) significantly increased sAPPα secretion as compared with control group. The increase in sAPPα secretion by TPPB was partially blocked by ERK inhibitor U0126, c-Jun N-terminal kinase (JNK) inhibitor SP600125 and protein tyrosine kinase (PTK) inhibitor genistein, but not by p38MAPK inhibitor SB203580. TPPB (1 μmol/L) increased the expression of phospho-p42/44MAPK without altering total p42/44MAPK levels.CONCLUSION: ERK, JNK and PTK may be involved in the regulation of APP processing by TPPB.