鲜王浆中超氧化物歧化酶的初步研究

本工作以一种非酶体系核黄素、四甲基乙二胺光照产生 Oi 氧化羟胺形成亚硝酸盐为原理测定 SOD 活性的新方法对新鲜蜂王浆中超氧化物歧化酶(SOD)的活性进行测定,结果表明,新鲜蜂王浆中存在 SOD,其活性含量大约为0.403ng/g。     

马克思主义哲学与理论创新

马克思主义哲学是创新的科学，它离不开理论创新。实践基础上的理论创新推动了马克思主义哲学的产生和发展，赋予它与时俱进的理论品质，使它永葆科学青春和旺盛的生命力；理论创新离不开马克思主义哲学的指导。马克思主义哲学为理论创新提供正确的世界观，提供科学的方法论，提供正确的方向保证。只有坚持马克思主义哲学的指导，全面贯彻“三个代表”的要求，才能在实践中不断推进理论创新。     

鳢肠对棉铃虫生长发育的影响

通过饲料混毒法测定鳢肠对棉铃虫生长发育的影响。结果表明,随饲料中鳢肠比例的加大和棉铃虫幼虫取食时间的延长,鳢肠对棉铃虫幼虫的生长发育具有明显的抑制作用。幼虫取食鳢肠比例高的饲料后,棉铃虫蛹质量显著降低,但羽化率和单雌日均产卵量与对照处理差异不显著;给棉铃虫幼虫饲喂鳢肠明显延长了幼虫和成虫历期,但对蛹历期的影响较小。     

优化施肥对春小麦产量、氮素利用及氮平衡的影响

2009 ～ 2010年,在宁夏引黄灌区分别以宁春11号和宁春16号小麦为供试作物,利用田间试验研究了优化施肥(OPT)和习惯施肥(CON)对春小麦产量、氮素吸收利用和土壤硝态氮累积的影响,表观评估了土壤—小麦体系氮素平衡.结果表明,相对于CK处理,OPT和CON都显著提高春小麦籽粒产量地上部生物量,并促进籽粒N和地上...     

Effects of Glyphosate on Soil Salinization and Alkalization in Cotton Fields

We analyzed the effects of glyphosate to the index of salinization and alkalization by simulation in soils collected from cotton fields in Anyang, Henan and Anqing, Anhui, China, in 2014. The results showed that application of glyphosate changed electrical conductivity (EC), total alkalinity (TAL), exchangeable sodium percentage (ESP), sodium adsorption ratio (SAR) and pH of soil in both regions，compared with the blank control. With increased frequency of glyphosate application and increased concentration applied, all indices increased in the Anqing cotton fields soil which were treated with concentrations of 2.5-20 g·L^－1 . However, EC, TAL and ESP increased dynamically in Anyang soil to which high concentrations of 20 g·L^－1 were applied only four consecutive times. After different glyphosate treatments, the soil pH value showed an upward trend but smaller changes. Therefore, after repeated use of glyphosate to soils of two different region soils, although the changes of all indices were within the range of non-saline and non-sodic soils, the soils affected by salt in the glyphosate aqueous solution tended towards saline-sodic soils.     

莱芜猪胴体切块质量预判

本文以莱芜猪肉质育种为例，介绍了在屠宰线上对胴体的肉色、大理石纹、特别是肌内脂肪进行主观评定预测的简单易行的方法，其结果可用于肉质选种选育。     

芽孢杆菌微生态制剂对京红1号蛋鸡产蛋性能和蛋品质的影响

试验旨在研究芽孢杆菌微生态制剂对京红1号蛋鸡产蛋性能和蛋品质的影响。选择健康、体况良好的404日龄京红1号蛋鸡960只,随机分为4组,每组6个重复,每个重复40只。对照组饲喂基础日粮,试验Ⅰ组饲喂基础日粮+益倍佳(凝结芽孢杆菌),试验Ⅱ组饲喂基础日粮+赐尔健(纳豆芽孢杆菌),试验Ⅲ组饲喂添加地衣芽孢杆菌+枯草芽孢杆菌(1∶1)混合制剂的日粮,试验组微生态制剂的添加量均为300 mg/kg。试验期25 d,其中预饲期5 d。结果显示,与对照组相比,试验组蛋鸡产蛋率均显著提高(P<0.05),破、软蛋率均显著降低(P<0.05),试验Ⅰ、Ⅱ组料蛋比显著降低(P<0.05)。与对照组相比,Ⅱ组鸡蛋平均蛋重显著提高了2.25%(P<0.05);试验组Ⅰ、Ⅱ的蛋黄相对重、蛋壳相对重、哈氏单位均无显著影响(P>0.05);试验Ⅲ组蛋壳颜色为1~3级的鸡蛋比例明显增多,差异显著(P<0.05)。综上所述,添加微生态制剂赐尔健(纳豆芽孢杆菌)可显著提高京红1号产蛋率和平均蛋重,显著降低料蛋比和破、软蛋率;添加枯草芽孢杆菌+地衣芽孢杆菌(1∶1)混合制剂可使蛋壳颜色加深的鸡蛋比例显著增多。     

农民培训网络课程设计探讨

目前农民培训网络课程存在诸多不足,包括内容脱离实际、缺少地区特色,表现形式单一,课程系统性不够强,供农民自主学习的资源不足,情感缺失严重,等等。农民培训网络课程的设计应体现适用性、速效性、简约性、交互性、动态性等原则;在具体操作中,应及时更新课程内容,运用通俗的语言,精心设计课程结构,建立动态网络信息资源系统,提供形式多样的学习支持服务。     

杜洛克与二花脸杂交猪群体SNP偏分离分析

偏分离（TRD）是生物中普遍存在的现象,本研究拟在高密度基因芯片判断基因型的大规模群体中挖掘猪基因组标记位点的偏分离位点并探究其潜在的遗传机制。本研究用60K Illumina Porcine SNP芯片对1 020头F2资源家系（杜洛克与二花脸杂交F0-F2群体）进行基因型分型,用偏分离分析软件TRDscan （BF>100）和TDT （P<0.01）方法在单个位点上检测偏分离信号,并对二者共有的显著信号位点附近100 kb窗口的基因进行功能分析。此外,本研究还利用单倍型分型的软件包PHASEBOOK采用多位点连锁分析的策略分析了父源和母源配子中的偏分离区域,并在该区域内搜寻潜在的QTLs。结果表明：1）在单位点的偏分离分析中共鉴定到44个显著的偏分离位点,筛选到23个相关基因;对父本和母本特异性偏分离效应进行分析时,分别鉴定到27和35个显著偏分离位点,其中,分别有11和25个位点的100 kb附近有已注释的功能基因。2）基于单倍型多位点连锁的偏分离结果显示,父本显著偏分离位点位于5和13号染色体上,在该偏分离区域内搜寻功能相关的QTL,共搜寻到3个与繁殖性状（木乃伊数、产活仔数、黄体数）有关的QTLs;分析母本偏分离位点时,在4、6和12号染色体上定位到显著偏分离区域,结合已知的猪QTL数据库,共找到了5个与繁殖性状相关的QTLs。本研究利用大规模猪家系数据系统地鉴别了猪基因组的偏分离位点,为解析猪中的偏分离现象和进一步探究其生物学机制提供了一定的参考作用。     

Physical simulation of fluid field and structure optimization in two-strand tundish

The influence of the structure and location of dam and weir on fluid flow state in a two-strand tundish is studied, and a set of optimal structure, combining with the average residence time calculated from RTD curve, is obtained. The result indicates that the fluid flow state can be changed and the path of the fluid flow can be prolonged as well as the average residence time is improved after using dam and weir. But there are some dead zones after fluid passed through the dam and weir. Combination scheme of No. one dam and weir is better than the others. Its average residence time is 299 s and the volume fraction of dead zone is 31.0%. After the optimization of flowing control parameters in tundish, the best case is that the distance between dam and weir is 290 mm and the distance between weir and the long nozzle is 383 mm. The longest average residence time is 351 s and the minimum volume fraction of dead zone is 19.0% under the above situation. Compared with that of no dam and weir, the average residence time increases by 65 s and the dead zone volume fraction decreases by 15.0%. Based on Newton formula, the calculated results show that the inclusions with diameter larger than 17.5 μm can float up within 351 s under this optimization situation.