浅谈用统筹法编制市政道路工程施工进度计划

在市政道路工程施工中,劳动力、设备和材料供应等因素对施工进展影响极大,本文针对如何解决上述问题,论述了采用统筹法编制施工进度计划的方法及步骤。     

长毛兔采毛方式的研究

为了探讨一种取代传统采毛方式－刀剪、手拔的先进技术，我们从法国引进了Ｌａｇｏｄｅｎｄｒｏｎ５００ｋｇ在本所试验兔场及固镇、阜阳兔场进行了试验及推广。结果表明：采毛方式对兔毛产量、质量均有不同程度的影响，刀剪毛对兔毛产量、质量的影响不大；两物手拔毛以后，兔毛产量、粗毛率分别提高９．６５％和２３．１１％；两次使用Ｌａｇｏｄｅｎｄｒｏｎ脱毛以后，兔毛产量、粗毛率分别提高８．４９％和１８．７０％。而且，Ｌ     

Whole-genome Sequencing and Analysis of Fowl Adenovirus Serotype 4 Strain GX2019-010 Isolated from Guangxi

To understand the genetic characteristics of fowl adenovirus serotype 4 (FAdV-4) in Guangxi region,the whole-genome sequencing were performed on a FAdV-4 strain GX2019-010 isolated from Guangxi in this study.Genome-wide nucleotide sequences were analyzed for homology alignment and genetic evolution,and the amino acid sequences of the major structural proteins Hexon,Penton and Fiber were further analyzed.The results showed that GX2019-010 had a full length of 43 719 bp and GC content of 54.9%,mainly including 43 potential protein coding regions.Genome-wide nucleotide homology comparisons revealed that GX2019-010 was 95.8% homologous to the pathogenic strain MX-SHP95,and 95.0% and 95.2% homologous to non-pathogenic strains ON1 and KR5,respectively.Genetic evolutionary analysis showed that GX2019-010 was in the same branch as the popular strains of FAdV-4 in China in recent years,but not in the same branch as the foreign strains of FAdV-4.This results indicated that there were genetic differences in FAdV-4.The main differences was at the right end of the genome and all domestic strains isolated in China were 1 966 bp missing including ORF19,ORF48 and ORF27 genes.It showed that FAdV-4 popular in China was territorial.Analysis of the amino acid sequences of the major structural proteins of Hexon,Penton and Fiber revealed that all of the three major structural proteins had mutations in amino acid sites,of which Fiber-2 had the most mutations.This study enriched the gene pool of FAdV-4 in Guangxi region and laid the foundation for future research on the prevention and control of HHS and epidemiological investigation.     

滨海沙地相思树引种试验研究

在滨海沙地进行５个相思树种的引种试验，通过１０ａ观测研究认为：相思树普遍能够适应滨海风沙地的恶劣条件，生长较好；厚荚相思生长迅速，干形较通直，高生长优势明显，可望成为继木麻黄、湿地松之后，营造海防林以及低效林更新改造的又一优良树种。     

蕨菜护色保脆工艺研究

以新鲜蕨菜为原料，对其护色保脆工艺进行了研究，结果表明，葡萄糖酸锌3．5mg／L、乳酸锌50mg／L、碳酸氢钠300mg／L、亚硫酸钠300mg／L、醋酸锌250mg／L组成的复合液护色效果最佳。乳酸钙100mg／L、氯化钙50mg／L、氯化镁150mg／L复合剂保脆效果最佳，护色剂与保脆剂的最佳配比为1：2。蕨菜真空冷冻干燥最佳条件是升华温度15℃、冷阱温度-55℃、真空度10Pa。     

化学镀Fe-Al-P合金初探

利用化学镀方法在铜基片上施镀了Ｆｅ－Ａｌ－Ｐ合金镀层。通过改变金属盐比率ＡｌＣｌ３／（ＡｌＣｌ３＋ＦｅＳＯ４）、金属盐ＡｌＣｌ３和还原剂ＮａＨ２ＰＯ２的浓度等参数，研究了合金镀层的沉积速率，成分，表面形貌及结构的变化规律，得到了最佳镀液配方，发现络合剂和还原剂的选择是提高镀层含Ａｌ量的关键。     

Fuzzy comprehensive evaluation on the quality of different mixed feeds for fattening lambs by using in vitro method

Fuzzy comprehensive evaluation and in vitro methods were used to rank nutritive quality of 15 mixed feeds (MF) formulated for fattening Tan-sheep weaned lambs, a breed distributed in northwestern China. In vitro parameters of neutral detergent fibre digestibility (NDFD), volatile fatty acids (VFAs) and ammonia nitrogen (NH₃–N) were used as evaluation parameters. Each MF consisted of alfalfa meal, bio-chemical treated maize stover and grain mix. The relative proportions of alfalfa meal:bio-chemical treated maize stover:grain mix (dry matter (DM) basis) was 10:50:40 (MF1), 20:40:40 (MF2), 30:30:40 (MF3), 10:45:45 (MF4), 20:35:45 (MF5), 30:25:45 (MF6), 10:40:50 (MF7), 20:30:50 (MF8), 30:20:50 (MF9), 10:35:55 (MF10), 20:25:55 (MF11), 30:15:55 (MF12), 10:30:60 (MF13), 20:20:60 (MF14) and 30:10:60 (MF15). Values of each observed parameter were differed significantly among the tested feeds (p < 0.05). Greater NDFD, AA, PA, BA and NH₃–N were observed for the MF9, MF14, MF2, MF11 and MF7 respectively, which indicated the associative effects between feeds constituents (e.g. concentrate, bio-chemical treated maize straw and alfalfa powder). The fuzzy comprehensive evaluation value of MF7 was the highest in the 15 mixed feeds, which indicated that the incubation effectiveness of MF7 was the best among the 15 mixed feeds when its roughage to concentrate ratio was 500 to 500 g/kg with roughage constituents of 400 g/kg bio-chemical treated maize stover and 100 g/kg alfalfa meal. It was concluded that fuzzy comprehensive evaluation is a useful tool for comprehensively considering the in vitro parameters of mixed feeds to rank the nutritive quality in terms of nutrient supply potential.     

测定多种动物血清中LH生物活性RRA法的应用

利用已建立的可测定多种动物血清中促黄体激素 ( LH)生物学活性的 LH-RRA法 ,检测了不同生理状态下的 LH分泌量 ,进一步分析了该 RRA法在实践应用中的可靠性。通过用特异性刺激 LH分泌的 LRH-A3注射动物和诱导体外培养的垂体细胞分泌 LH的试验表明 ,该方法具有很高的特异性和可靠性。结果显示 ,雄兔对于 LRH-A3刺激有特异性反应。 2只兔前后、不同兔同时的对照试验表明 ,该 RRA法可以特异性地检测出 LRH-A3引起的 LH特异性变化。对母猪发情至早期妊娠阶段血清中 LH检测结果表明 ,此 RRA法可有效地测定出猪血清中 LH的动态变化。利用绵羊垂体细胞体外培养模型 ,分别用不同剂量的 LRH-A3( 0、1、1 0、1 0 0、1 0 0 0 ng/孔 )诱导垂体细胞合成和分泌 LH,RRA测定结果表明 ,试验组 LH含量分别比对照组增加 1 .77、1 .78、2 .0 3和 1 .4 6倍 ( P <0 .0 1 ) ,呈现剂量依赖关系。以上结果表明 ,建立的 LH-h CG的 RRA可以替代 RIA和体外生物测定法     

两用核不育系培矮64S制种时“九二0”的喷施技术初探

根据多项试验 ,着重从株高、节间比值、包颈长、柱头外露率、结实率、未包穗率 ,齐穗天数等方面分析 ,表明培矮 64S在制种中喷施“九二 0”以抽穗 10 %时为最佳时期 ,每公顷共喷施 4 5 0g ,分两次喷 ,先重后轻为好 ,其穗层结构最有利于异交结实     

大约克夏猪生产性能的选育研究--群体继代选育对大约克夏猪生产性能的影响

本试验通过开放式群体继代选育方法来提高大约克夏种猪的生产性能 ,经过连续 4年选育 ,结果表明 :大约克夏后备种猪的平均日增重由 76 0 .34g上升至 798.74g ,上升了 38.5g ;料重比由 2 .84下降至 2 .78;活体背膘厚由 1 .91cm下降至 1 .87cm ;同时大约克夏猪的产活仔数由 1 1 .81头上升至 1 2 .0 6头 ;胴体瘦肉率由 6 5 .81 %上升至 6 6 .99%。这表明 ,开放式群体选育能提高大约克夏猪的生产性能。