番茄穴盘育苗苗龄的研究

在穴盘育苗条件下 ,对番茄的适宜苗龄进行了研究 ,结果表明 ,大龄苗〔60d(天 )〕秧苗素质较差 ,前期产量虽高 ,但总产量偏低 ,小龄苗〔30d(天 )〕总产量最高 ,但前期产量低 ,中龄苗〔4 5d(天 )〕则表现秧苗素质好 ,前期产量较高 ,且总产量与小龄苗相比差异不显著 ,具有较高的生产力。     

Effects of psychological stress on in vitro expression of activated surface molecules on T cells of peripheral blood from healthy persons

AIM: To study cellular and molecular mechanism involved in increasing susceptibility of infection in psychological stress persons. METHODS: Comparative studies were performed with double staining and flow cytometry analysis on immunophenotyping and in vitro expression of early activating surface molecule CD69 in response to mitogens on T cells from peripheral blood of 20 healthy college student volunteers before and after psychological stress. A series of term final examinations was defined as psychological stress. RESULTS: Immunophenotyping analysis showed no statistically significant difference in the percentage of CD2, CD3, CD4, CD8, CD19, CD20, CD16 and CD56 positive lymphocyte populations before and after psychological stress. There was a statistically significant decrease in the in vitro expression of CD69 in response to polyclonal stimulators on the T cells from persons after psychological stress than those before psychological stress. The percentage of CD69 expression (CD69⁺CD3⁺/CD3⁺%) in response to PHA and PDB in the whole blood culture for 72 hours decreased respectively from 28.1±4.1 and 80.7±6.8 on the T cells obtained before psychological stress to 17.6±3.8 and 65.8±7.9 on those obtained after psychological stress, while there was no statistically significant difference between the CD69 expression rates without stimulators on the T cells obtained before and after psychological stress. CONCLUSIONS: The effects of psychological stress to immune system is not on the level of changing proportions of the sub-populations within peripheral blood lymphocytes. Psychological stress can decrease the activating response of T cells in healthy persons, which may be responsible for the increase of susceptibility to infection in the psychological stress persons.     

Effects of EBV infection on growth and apoptosis of nasopharyngeal carcinoma cell line

AIM: To explore the effect of EBV infection on growth and apoptosis of nasopharyngeal carcinoma(NPC) cell line.METHODS: NPC cell line CNE1 was directly infected by Epstein Barr virus (EBV). The expression of EBV-latent membrane protein 1 (EBV-LMP1) and bcl-2 were detected by immunohistochemistry method (LSAB). The growth of NPC cells was identified by MTT method. Apoptotic carcinoma cells were detected by flow cytometry analysis and the terminal deoxynucletidyl transferase-medicated dUTP-biotin nick end labeling (TUNEL) methods. RESULTS: EBV-LMP1 was positive in CNE1 infected by EBV(E-CNE1). Compared with CEN1, the growth of E-CNE1 apparently increased (P＜0.01). No apoptotic carcinoma cells were detected and bcl-2 postive cells were 2%~3% respectively in 2 kinds of NPC cells.CONCLUSION: Growth of NPC cells is enhanced by EBV infection and EBV-LMP1 expression, but no influence on expression of bcl-2 and apoptosis of NPC cells.     

广西糯玉米品种种质构成及穗部性状选育探讨

对2011-2022年广西审定的173个糯玉米品种进行分析,研究广西糯玉米品种种质来源、构成,探析品种选育路径。结果表明,广西糯玉米主要种质由A (宜山糯)类、B (京科糯2000)类、C (万糯2000)类、D (燕禾金2000)类、E (中糯1号)类、F (中糯2号)类、G (衡白522)类、H (华珍)类、I (花甜糯179)类、J (NA群体)类、K (NB群体)类等11类种质构成,A、B类种质是广西糯玉米品种的基础种质。根据亲本主要种质类型,排除年份间的环境变化因素,可将93个品种归入AB等15个群组。各群组穗部性状相关分析表明,穗行数、穗粗与产量及其他穗部性状分别呈显著负效应及无显著效应,群组相关性受到种质组合及组配模式共同影响,通常情况下种质组合的影响力更强,涉及F类种质的群组则相反。因此,穗部性状选育重点要根据亲本主要种质类型确定。     

30%乙酰甲胺磷乳油对水稻纵卷叶螟的防治效果与技术

对30%乙酰甲胺磷乳油防治水稻纵卷叶螟(Cnaphalocrocis medinalis)的田间效果进行了试验。结果表明:使用30%乙酰甲胺磷乳油防治水稻纵卷叶螟的杀虫效果均在71.7%以上,保叶效果高达83.8%。     

"服务无小事,小事意义大" ——高校图书馆服务礼仪片论

从学校公共关系角度,揭示了高校图书馆服务礼仪对图书馆形象和高校形象所具有的形象外显和形象隐喻价值,论述了“规范的服务礼仪”的基本要求,探讨了在服务礼仪的教化和培训中内化和外化相结合的方式。     

基于粒子群算法的圆柱度误差评定方法

根据最小区域条件,建立了圆柱度误差的数学模型以及优化目标函数和适应度函数,阐述了粒子群优化算法的原理和实现方法,然后根据粒子群算法优化求解。实例表明,该方法对于圆柱度误差评定等非线性优化问题能得到全局最优解,粒子群优化算法的计算精度与其他满足最小条件的计算方法相比略有提高,且参数设置少,计算速度快,可用于三坐标测量机等测量系统的圆柱度误差测量后的数据处理。     

啤酒污染微生物控制专家系统的设计与开发

专家系统是人工智能技术的一个重要的应用领域。该文首次将专家系统应用于啤酒污染微生物控制领域之中,详细介绍了啤酒污染微生物控制专家系统的设计和开发,包括对啤酒及污染微生物相关知识和实验技术知识,并对它们进行信息化处理和加工。啤酒污染微生物控制专家系统(beer-spoilage microorganism control expert system, BSMCES)是应用专家系统的基本原理,利用Apache+PHP+MySQL作为开发平台,设计并实现了啤酒污染微生物控制专家系统。该系统可以实现信息咨询、污染控制、决策支持、技术服务等功能。     

互插式连栋温室风压分布模拟分析

以CFD理论为基础,建立了互插式连栋温室周围空气绕流的数学模型,设定了流体的边界条件,运用Fluent软件对互插式连栋温室的风压分布进行模拟分析。模拟结果表明,风力对温室作用主要是向上的升力;风压系数沿温室跨度方向分布的数值模拟结果与风洞试验结果基本吻合;上风向和下风向风压系数沿温室高度方向呈二次曲线分布,相关系数分别为0.975和0.990;最后将模拟得到的风压系数转换成相应的风载体型系数,为结构优化设计提供参考。     

鲜牛奶营养评价与FOP标签方案

为指导消费者选购整体营养价值高的鲜牛奶,以及优化鲜牛奶供给结构,本文借鉴瑞典锁孔(Keyhole)标识、较健康选择标志、指引星标签、选择标识、NuVal评分标签的营养素度量法以及评价鲜牛奶的营养成分、信息显示形式等国外实践经验,构建富含营养素食物(NRF)9.3模型,对《中国食物成分表》(第6版第2册)收录的鲜牛奶(全脂,光明鲜牛奶)、鲜牛奶(全脂,现代牧场鲜牛奶)、鲜牛奶(全脂,完达山鲜牛乳)、鲜牛奶(全脂,辉山鲜博士鲜牛奶)、鲜牛奶(全脂,一鸣鲜牛奶)、鲜牛奶(全脂,新希望千岛湖牧场鲜牛奶)6种鲜牛奶营养数据开展营养评价。结果发现,6种鲜牛奶的NRF 9.3值均大于0,每418.4 kJ的鼓励性营养成分含量均高于限制性营养成分含量,但这些鲜牛奶间的营养价值差别不大。虽然6种鲜牛奶适用于评分、评级FOP标签方案,但鲜牛奶仅能以2～3星级展示,不及评分的区分度高,更适合采用评分型方案。