新校区学生教育管理工作探讨

新校区建设是学校扩大办学规模,提高办学效益,实现快速发展的重要保证。面对新形势、新机遇、新挑战,积极探索适合新校区特点的学生教育管理新机制、新模式,为学校的发展和学生的成长创造有利的条件。     

Effects of stocking density and algal concentration on the survival,growth and metamorphosis of Bobu Ivory shell,Babylonia formosae habei (Neogastropoda: Buccinidae) larvae

Independent and combined effects of stocking density and algal concentration on the survival, growth and metamorphosis of the Bobu Ivory shell Babylonia formosae habei larvae were assessed using a 5 × 5 factorial design with densities of 0.25, 0.5, 0.75, 1.00 and 1.50 larvae mL⁻¹ and algal concentrations of 5, 10, 15, 20 and 25 × 10⁴ cells mL⁻¹ in the laboratory. Larval growth, survival and metamorphosis were significantly affected by both the independent effects of stocking density and algal concentration and by their interaction. The highest per cent survival (72.5%) and metamorphosis (49.5%), fastest growth (41.57 μm day⁻¹) and shortest time to initial metamorphosis (10 days) all occurred at the lowest stocking density and the highest algal concentration. Both crowding and food limitation had independently negative impacts on the survival, growth and metamorphosis of larvae, and these negative impacts were further strengthened by the interaction of a higher stocking density and a lower algal concentration. Moreover, the results suggest that stocking density and algal concentration obviously played different roles in determining larval survival and growth. To maximize survival and growth, B. formosae habei larvae should be reared at a lower stoking density of 0.25 larvae mL⁻¹ and fed a higher algal concentration of 25 × 10⁴ cells mL⁻¹ in large-scale hatchery seed culture.     

基于博客(Blog)的图书馆人性化服务探析

通过分析博客和人性化服务的内涵,探讨利用博客开展人性化服务的可行性。在为读者提供服务的过程中,提出创建咨询导航博客、新闻型博客、书目导读博客和读者服务博客等不同类型的博客,以满足不同的读者需求,提高图书馆读者服务水平,深化人性化服务的内涵。     

霉菌毒素对家禽生产的影响

<正>霉菌毒素是霉菌以饲料为营养源的生长过程中所产生的有毒化学物质。在谷物收割前或贮存、运输、加工和饲喂过程中,霉菌都可在其中生长并产生霉菌毒素。全球每年大约有25%的农作     

地膜覆盖对杂种落叶松二代林造林微环境和生长的效应

为了改善落叶松二代林造林微环境、促进造林后幼林的生长,在佳木斯市孟家岗林场落叶松二代林造林过程中采用了地膜覆盖效应试验。试验结果表明,造林时铺设地膜能够显著提高土壤表层(0～10cm)温度和土壤上层(0～30cm)含水量(P0.05),生长季的初期(5月)、中期(6月)和末期(10月),土温分别提高0.9、1.6、0.7℃,土壤含水量分别增加5.2%、1.8%、1.9%。覆有地膜的落叶松的高生长和地径生长均显著高于无地膜处理(P0.05),造林当年和第二年,覆膜与不覆膜的高和地径增幅分别为16.78%和3.23%及32.70%和21.21%。试验证明,落叶松造林过程中铺设地膜能够有效促进落叶松二代林成林阶段苗木的生长。     

中国产业开发扶贫的经验及对发展中国家的启示

中国十几年的扶贫经验表明,产业开发扶贫是带动贫困地区产业结构调整和农民就业结构调整,帮助农户脱贫的有效措施。本文旨在通过探讨中国产业开发扶贫提出的背景,阐明中国实施产业开发扶贫的必要性,并结合案例分析中国实施的两种主要的产业开发扶贫模式的反贫困机理,以期为正在实施产业开发扶贫的发展中国家提供一些借鉴与启示。     

银耳多糖对生长肥育猪生产性能、免疫功能及肉质的影响

本研究旨在考察银耳多糖(TP)对生长肥育猪生产性能、免疫功能及肉质的影响,并与抗生素的效果进行比较.本试验采用单项分类设计,将24头去势杜×长×大仔猪[(10.01±0.65) kg]按体重相近的原则随机分为对照组、抗生素组(恩拉霉素+硫酸抗敌素,ANT组)和银耳多糖组(TP组).结果显示:1)20 kg前TP组的平均日增重(ADG)略低于ANT组,此后显著高于ANT组(P＜0.05);TP组较对照组显著提高了各阶段的ADG,降低了全期料肉比(P＜0.05).2)TP组血清IGF-Ⅰ浓度较ANT组不断提高,112 d达显著水平(P＜0.05),且各阶段均显著高于对照组(P＜0.05).3)较之ANT,TP能显著提高各阶段淋巴细胞转化率(LTR)和血清白细胞介素-2浓度(P＜0.01);与对照组相比,TP可不同程度地提高LTR以及血清IgG浓度(P＜0.05).4)与ANT相比,TP能显著降低肌肉滴水损失和亮度L*值(P＜0.05),提高肌内脂肪含量;较之对照组,TP可显著提高眼肌面积和pH,降低黄度b*值(P＜0.05).结果表明,TP可以提高生长肥育猪各阶段的生产性能,其促生长效果优于抗生素,并且还具有提高免疫功能和改善肉质的作用.     

高校图书馆图书招标的质量控制研究

分析高校图书馆图书招标的意义及出现的问题，同时结合工作实践提出保证图书招标质量的几点建议。     

Efficiency of methods applied for goat estrous synchronization in subtropical monsoonal climate zone of Southwest China

Two experiments were undertaken to select the efficient method applied for goat estrous synchronization. In experiment 1, a total of 120 does (Capra hircus) were divided into five groups with a randomized block design, and the does of treatment 1 were synchronized by intravaginal sponges impregnated with 30 mg Levonorgestrel inserted for 10 days. Does of treatments 2, 3, and 4 were treated with further injection of 25 IU follicle-stimulating hormone (FSH), 0.05 mg prostaglandin F2 alpha (PGF_2α), and 25 IU FSH + 0.05 mg PGF_2α at sponge withdrawal, respectively. The does in the control group (n = 40) without estrous synchronization treatment and natural estrous does were observed. In experiment 2, a total of 140 does in five goat farms in breeding and non-breeding seasons were treated with the selective efficient procedure. The results presented that all the employed treatments were capable of inducing and synchronizing estrous goats. According to estrous response and economy, the use of intravaginal sponges impregnated with 30 mg Levonorgestrel and 0.05 mg PGF_2α (treatment 3) is the first choice for estrous synchronization, and 95.0% of synchronized does demonstrated estrus, which was significantly higher than that of treatment 1 (P < 0.05) and control group (P < 0.01). The percentages of ovulating of treatments 3 and 4 were the same (95.0%), which were significantly higher than that of treatment 1 (P < 0.01). The ovulation rates among different groups were not significant (P > 0.05). When the selective procedure was applied to five goat farms, 85.7% (120/140) of does demonstrated estrus, and the kidding percentage, litter size, and prolificacy rate were 53.6%, 0.95, and 177%, respectively.     

世界种植业产品贸易发展现状与趋势分析

本文分析了1990年以来植物性产品贸易发展状况和市场格局,归纳了其发展特征,并展望了其中短期走势.