预处理结合低温贮藏对康乃馨切花保鲜效果研究

为探讨康乃馨鲜切花最佳保鲜方法,在低温条件下,通过在保鲜液中添加蔗糖、8-羟基喹啉(8-HQ)、柠檬酸(CA)及外源激素6-BA和2,4-D等,研究康乃馨切花的采后保鲜效果。结果表明,2周4℃的低温保存结合预处理增加了康乃馨切花花径、花蕾长度、花枝鲜质量,提高了花瓣CAT活性,其中,5%蔗糖+100mg/L 8-HQ+200mg/L CA+100mg/L 6-BA配方组合保鲜效果最佳。由此说明,在低温条件下,预处理对康乃馨切花的保鲜和延缓衰老有较好的作用,且添加外源激素6-BA比2,4-D作用更佳。     

Bacillus subtilis Z-27制剂对仔猪肠道酶活及消化性能的影响

试验目的在于研究枯草芽孢杆菌(Bacillus subtilis)Z-27制剂对断奶仔猪肠道消化酶活力、常规营养成分、生长性能的影响,为该菌剂的益生机理的研究提供参考。将供试仔猪分为试验组和对照组,试验组饲喂添加0.1%Z-27菌剂的T2饲料,对照组饲喂T2饲料。采用GB/T 23527—2009、GB/T8275—2009等方法测定仔猪粪便中蛋白酶、α-淀粉酶等消化酶活力;利用GB/T 6435—2006、GB/T6432—94等方法测定粪便中水分、粗蛋白质等常规养分的含量;记录采食量并称取始重和末重。试验表明,与对照组相比,试验组仔猪的粪便中蛋白酶、α-淀粉酶、纤维素酶的平均活力和脂肪酶水解液酸价分别提高了62.99%、34.56%、133.10%和66.57%;粪便中残留的粗蛋白质、淀粉、粗脂肪和粗纤维等有机成分含量分别下降了30.51%、52.13%、18.44%和26.73%,而无机成分的含量基本无变化;平均日增重提高了9.38%,料重比降低了4.94%。研究表明,枯草芽孢杆菌Z-27制剂具有提高仔猪肠道消化酶活力、提高饲料转化率、改善仔猪生长性能的作用。     

三峡库区传统耕作措施水土保持机理研究

通过大量野外勘查、测量数据,说明了传统耕作措施的规律性及其坡长与坡度特征参数,同时将物理过程侵蚀模型(WEPP)模拟结果与实测数据进行对比分析,主要从坡长因子的角度阐明了传统耕作措施的水土保持作用机理。研究结果表明,实测的5°~10°、10°~15°、15°~20°、20°~25°、25°~30°坡面对应的坡长分别为7~10 m、5~7 m、4~6m、3~5 m、3~4 m,与同一坡度条件下WEPP模拟的坡面侵蚀发生的突增拐点值比较接近;传统耕作措施通过缩短坡长来分散坡面径流,阻止细股流的形成,从而有效防止了坡耕地中主要的侵蚀类型——细沟侵蚀。     

三种耕作制度下密西西比州两种加入家禽垫料的土壤上磷动态研究

An experiment arranged in a randomized complete block design with three replications was conducted on a Lexington soil (fine-silty, mixed, active, thermic, Ultic Hapludalfs) and a Loring soil (fine-silty, mixed, active, thermic, Oxyaquic Fragiudalfs) in Mississippi from September 1997 to September 2000 on 18 runoff plots under natural rainfall condition to study the phosphorus (P) dynamics in poultry litter amended soils under three management systems combining tillage and planting date treatments to identify effective management practices in southern U. S. A. The management systems in the study were:1) tillage in the fall prior to litter application followed by a delayed planting of fall forages (CT-DP); 2) tillage followed by immediate planting of the fall forage with subsequent litter application (CT-IP); and 3) no-till with planting prior to litter application (NT-IP). The results indicated that there was significant increase in soil P after 3 years of poultry litter application for both Lexington and Loring soils (P <0.05). Based on P budget analysis, the majority of P from poultry litter application (> 90%), was accumulated in both soils. In Loring soil, soluble P mass in the runoff was significantly higher from NT-IP than from CT-DP and CT-IP over the entire study period (P <0.01). For both soils, there were no significant differences in sediment P mass between management systems. For Loring soil, CT-DP and CT-IP were effective management practices to mitigate negative effects due to poultry litter application.     

瘦身健身运动处方对超重及肥胖大学生锻炼效果的分析

目的：探讨瘦身健身运动处方锻炼对超重、肥胖大学生身体的影响。方法：24名超重、肥胖大学生在课外体育活动中按瘦身健身运动处方坚持锻炼8周(每周3次,每次40min)．测定实验者身体形态指标和机能指标。结果：锻炼后不仅能减轻实验者体重,降低脂肪含量,改善体形和身体成分,还能保持瘦体重．提高身体素质．增强心功能。结论：大学生可以根据自身的体形与体质特点选择有针对性的瘦身健身运动处方进行锻炼。     

秦汉时期官方蓄犬现象研究

秦汉时期,官方蓄犬非常普遍。按正史记载及律令要求,此种现象既是选择偏好,也是制度使然,从朝廷中央到地方郡县、边关烽燧莫不如此。与之相应的是官方也为之配备专门的馆舍和官员。对这些犬只的管理,秦汉律令从数量、饲养环境、体型大小等角度都有限制。它们满足了各级官府治理鼠患、祭祀驱邪、娱乐狩猎、警戒防盗、肉食供给等多方面的需要。另外,此时文武官员对皇帝常以"犬马"自称,这种现象或许也与官方蓄犬浸染有关。     

25mm厚进口桃花心木干燥基准的优化

采用实验室干燥试验设备,按企业生产干燥基准进行25 mm厚桃花心木干燥试验,并通过锯材干燥质量检测和分析,制定出常规干燥基准的优化方案。结果表明:采用优化的干燥基准,干燥周期由企业原基准的12 d缩短为6 d,干燥效率提高一倍,残余干燥应力值显著降低,锯材综合干燥质量由3级提升至2级,可满足家具、地板等实木制品对锯材质量的要求。     

Long-Term Cropping System, Tillage, and Poultry Litter Application Affect the Chemical Properties of an Alabama Ultisol

Sustainable agricultural practices have been steadily increasing in the last couple of decades. These management practices frequently involve cover crops, less or no-tillage, and organic fertilization. In this study, we evaluated the effects of cropping systems,tillage and no-tillage, and the application of poultry litter(PL) on selected soil physicochemical properties and soil test nutrients. Soil samples were collected from the topmost surface(0–5 cm) and subsurface(5–10 cm) layers. The general effect trend was PL application no-tillage cover crop cropping type. There were more statistically significant(P ≤ 0.05) correlations between the 18 soil attributes at the topmost surface than at the subsurface. This could be due to the accumulation of external C inputs and nutrients by crop residues and PL application as well as the retaining effects of no-tillage on less mobile nutrient components. Because of their high mobility and volatile nature, total nitrogen(N), ammonia-N(NH_4~+-N), and nitrate-N(NO_3~--N) levels varied greatly(high standard deviations), showing no consistent patterns among the treatments. Compared to the soybean cropping system, corn, especially with the wheat cover crop, contributed more to the total carbon(C) and sulfur(S) in the topmost surface soils(0–5 cm). Poultry litter application greatly increased pH, cation exchange capacity(CEC), base saturation, magnesium(Mg), phosphorus(P), calcium(Ca),sodium(Na), potassium(K), manganese(Mn), copper(Cu), and zinc(Zn) in both soil layers. Contrast comparisons revealed that PL application had more of an effect on these soil chemical properties than no-tillage and cropping systems. These results will shed light on developing better nutrient management practices while reducing their runoff potentials.     

微生物素在果蔬采后保鲜中的应用进展

微生物素在果蔬采后保鲜中有重要的应用价值,但目前实际应用在果蔬采后保鲜领域中的并不多。本文分析了目前已经应用到果蔬保鲜领域的微生物素种类,有乳酸链球菌肽、溶菌酶、木霉发酵液等,分析了其抑菌保鲜原理及研究现状;并结合微生物素的特点,提出了微生物素在未来果蔬采后保鲜中的发展趋势,即面对冷藏技术使用不完善的现象,可以开发利用更多的微生物素种类,如纳他霉素、红曲霉素、短梗霉多糖等,为今后果蔬采后保鲜领域的健康可持续发展提供参考。     

利用BIOLOG系统对不同种类细菌鉴定的研究

为完善细菌鉴定工作,本试验通过利用BIOLOG细菌自动微生物分析系统(简称BIOLOG系统)对13株大肠杆菌、15株巴氏杆菌和7株金黄色葡萄球菌进行了鉴定,并与传统方法[1]包括形态学观察、革兰氏染色、生化实验等的鉴定结果进行了比对.实验结果表明,与传统方法相比BIOLOG系统具有准确、快捷、简便的优点,同时也有一定的局限性,从而为BIOLOG系统的更好使用提供了实验依据.