口含烟中主要成分和游离烟碱含量的多元分析

为考察口含烟中主要成分对游离烟碱含量的影响,以41个Moist Snuff类型口含烟为实验材料,采用相关分析、回归分析和通径分析法探讨口含烟中含水率、pH值、烟碱对游离烟碱含量的影响.得到如下结果:(1)相关性分析表明,pH值、烟碱与游离态烟碱呈正相关,且相关系数分别达5％显著和1％极显著性水平,而含水率与游离烟碱相关...     

Platycodin D protects oral epithelial cells against infection of Candida albicans

AIM: To investigate the effect of platycodin D on Candida albicans infection in oral epithelial cells. METHODS: The viability of the oral squamous carcinoma KB cells was detected by MTT assay after treated with different concentrations of platycodin D. The KB cells were infected with Candida albicans, and then were incubated with platycodin D at different concentrations. Adherent numbers of the Candida albicans were counted by Gram staining, and the bacterial activity and conversion were measured by Trypan blue staining. Furthermore, the protein levels of IL-18 and human β-defensin 2 (HBD-2) were analyzed by ELISA, and the expression of HBD-2 at mRNA and protein levels was determined by RT-qPCR and Western blot, respectively. RESULTS: The viability of the KB cells was not affected by platycodin D at the concentrations used. The adherent numbers, bacterial activity and conversion were decreased by treatment with platycodin D in a dose-dependent manner. In addition, the protein level of IL-18 in the culture supernatant and the mRNA expression of HBD-2 in the KB cells were also reduced after platycodin D treatment.CONCLUSION: Platycodin D has a bacteriostasis effect and prevents oral epithelial cells from Candida albicans infection.     

口服补液盐防治家畜应激作用的初步实验研究

通过口服补液盐(ORS)对地塞米松驴应激模型防治作用实验,初步证明ORS有防治应激作用。为了更进一步证实其作用,进行了ORS防治4次猪运输和3次羊运输应激实验,结果证明予饮ORS液比常水对猪运输应激发病率减少了10％～18％,发病死亡率减少了0～23.1 ％;对羊发病率减少了4.6％～6％。运输前和运输后2个月称重表明,猪羊饮ORS液较常水具有增重快的趋势。     

The use of oral endoscopy for detection of cheek teeth abnormalities in 300 horses

The main objective of this study was to evaluate an endoscopic examination protocol for routine dental examination in horses. The oral cavities of 300 standing, sedated horses were examined under field and hospital conditions with a rigid endoscope using a standardised technique that included examination of the occlusal, lingual (palatal) and buccal surfaces of all cheek teeth rows. The most common cheek teeth abnormalities detected were sharp enamel edges (present in 96.3% of horses), focal overgrowths (64.3%), fissure fractures (54.3%), diastemata (24.3%) and infundibular hypoplasia/caries (48.3%). Rigid endoscopy of the equine oral cavity was found to be a safe non-invasive diagnostic technique that appeared to be superior to clinical oral examination for detecting subtle cheek teeth changes.     

家蚕Polh+ Bac-to-Bac杆状病毒表达系统的构建

为利用杆状病毒的强启动子——多角体启动子而构建的重组杆状病毒一般是多角体缺失型(polh-)病毒。为了解决家蚕生物反应器规模化生产中病毒必需经皮接种而效率低下的问题,在建立家蚕Bac-to-Bac快速表达系统的基础上,构建了能形成多角体的家蚕Polh+ Bac-to-Bac表达系统。通过该系统能够产生表达外源目的基因的重组病毒,获得的该重组病毒能在培养细胞内表达,也能通过经口添食感染表达。利用EGFP报告基因分析了该系统的表达效果,构建的重组病毒不仅有效表达了EGFP蛋白,还在细胞核中形成了大量多角体。该系统较好解决了重组病毒必需经皮接种感染的缺陷,提高了生产效率,拓宽了杆状病毒在生物杀虫剂、基因治疗等领域的应用前景。     

仔泻康口服液的质量标准研究

为了研究仔泻康口服液质量标准,以便控制产品质量,采用薄层色谱法(TLC)对制剂中黄芪、黄芩、黄连、白头翁进行定性鉴别;用高效液相色谱(HPLC)法对制剂中黄芩苷、盐酸小檗碱进行含量测定。结果 TLC鉴别分离度好,简单、灵敏、专属性强。黄芩苷线性范围在0.12～0.75μg(R2=0.9975),平均回收率为97%,RSD=1. 46%(n=6);盐酸小檗碱线性范围在0. 125～0. 75μg(R2=0.9929),平均回收率为93.33%,RSD为2.21%(n=6)。对黄芪、黄芩、黄连的定性鉴别及黄芩苷、盐酸小檗碱的含量测定,方法简单、准确、可靠,所建的标准可用于仔泻康口服液的质量控制。     

洋葱对草鱼细菌性烂鳃病的治疗效果试验

[目的]探讨洋葱对草鱼细菌性烂鳃病的治疗效果。[方法]在试验室内、人工控制条件下,通过对患典型细菌性烂鳃病的草鱼采取口服和泼洒相结合的方法,治疗1个疗程疗程。[结果]洋葱不同用药浓度对患病草鱼治愈率不同,其中口服法以药饵在饲料添加为1.0%~2.0%,遍洒法以药物浓度为2.0~5.0 g/m3时效果较好,治愈率可达70%~90%。[结论]表明洋葱对草鱼细菌性烂鳃病有治疗效果,可作为治疗草鱼细菌性烂鳃病的药物。     

洋葱对草鱼细菌性烂鳃病的治疗效果试验

草鱼细菌性烂鳃病是由柱状屈桡杆菌引起的草鱼水产养殖中最常见的病害之一。该病发病季节长、流行广,常造成大批鱼,尤其鱼种的死亡,给草鱼养殖造成较大的损失。目前该病在疾病防治上多采用化学防治,但化学防治易导致病原体产生耐药性和水环境药物残留,与健康、无公害养殖的现代渔业养殖主题相背。为此,笔者选择洋葱作为草鱼细菌性烂鳃病的防治药物,