苜蓿秸秆压缩仿真离散元模型参数标定

为了提高苜蓿秸秆压缩过程中离散元仿真研究所用参数的准确度,该研究采用物理试验和仿真优化设计相结合的方法对离散元仿真参数进行标定。首先,以接触参数物理试验结果为仿真参数选择依据,利用Plackett-Burman试验对初始参数进行显著性筛选,方差分析结果表明,苜蓿秸秆-苜蓿秸秆静摩擦系数、苜蓿秸秆-苜蓿秸秆滚动摩擦系数、苜蓿秸秆-45钢静摩擦系数对仿真休止角影响显著。进一步以休止角的相对误差值为评价指标,对3个显著性参数进行最陡爬坡试验,优化显著性参数取值范围,并基于Box-Behnken试验建立休止角与显著性参数的二阶回归模型,以物理试验得到的38.88°休止角为目标值,对显著性参数进行寻优,得到最优组合:苜蓿秸秆-苜蓿秸秆静摩擦系数为0.45、苜蓿秸秆-苜蓿秸秆滚动摩擦系数为0.08、苜蓿秸秆-45钢的静摩擦系数为0.54。最后利用T检验得到P0.05,表明仿真休止角与物理试验值无显著性差异,验证了最优参数组合的可靠性。研究结果表明,应用上述各优化试验来标定离散元仿真参数是可行的,同时标定的参数可为苜蓿秸秆的其它仿真试验提供参考。     

陆地棉自然群体纤维强度性状的全基因组关联分析

纤维强度是衡量棉花纤维品质的重要指标之一。了解棉纤维强度形成的遗传基础对棉花纤维品质的遗传改良具有重要的指导意义。本研究利用83份纤维强度差异显著的陆地棉材料，采用广义线性模型（General linear model, GLM），对5个环境的纤维强度及最佳线性无偏估计值（Best linear unbiased prediction，BLUP）进行全基因组关联分析（Genome-wide association study，GWAS）。结果表明，各环境纤维强度基本符合正态分布，且存在丰富的变异，变异系数为5.55%～8.44%，广义遗传力达到88.67%。GWAS共检测到19个稳定的显著关联SNP位点，分布在A01、A06、D05、D08、D10、D11和D13等7条染色体上，合并为9个数量性状位点（Quantitative trait locus， QTL）区间，其中4个QTL区间与前人定位的QTL区间重叠，其它5个QTL区间是本研究新发现的控制纤维强度性状的稳定位点。根据区间内基因的表达模式及功能注释，共筛选出4个可能与纤维强度相关的候选基因。本研究通过对棉花纤维强度进行全基因组关联分析，为棉花纤维品质性状的分子遗传改良奠定了基础。     

Evaluation of Assouline–Or Adjusted Model to Express Soil Drainage Curve

Eurasian Soil Science - The objectives of this research are prediction of soil drainage curve using Assouline and Or (2014) adjusted soil drainage model and comparison of the predicted results with...     

An updated review: Laboratory investigation of equine renal disease

A variety of laboratory tests are available to assist the clinician in the assessment of kidney health and function. The majority of widely used tests are indicative of altered renal function, not becoming abnormal until function is significantly compromised. These include serum urea and creatinine concentrations, serum electrolyte concentrations, urine specific gravity (USG), fractional electrolyte excretion ratios and symmetric dimethylarginine (SDMA) concentrations. Some of these parameters may also be affected by nonrenal disease. The results of a further group of tests can indicate renal damage, but do not reflect renal function. These include urine tubular enzyme concentrations, urine protein concentrations, urine neutrophil gelatinase-associated lipocalin (NGAL) concentrations and cytological abnormalities.     

动物医学临床教学数据库的构建与初步应用

动物医学专业不仅要求学生掌握扎实的理论知识,还需要具有丰富的临床实践经验。为了实现该目标,除了要求授课教师对专业知识融会贯通,更需要拥有大量典型的临床病例资料。以安徽农业大学动物医院和畜禽疾病诊断中心为平台,收集大量宝贵的临床病例资料和最新的临床诊疗技术,构建了动物医学临床教学数据库,使得诊疗动物种类多样化,案例信息全面化、系统化。该数据库的建成和应用,为临床教师提供了丰富的教学素材和资料,亦提升了学生的学习兴趣,促进了动物医学专业的教育教学发展。     

转基因抗虫棉sGK中3017良种繁育技术

总结归纳丰产转基因抗虫棉sGK中3017良种繁育技术.主要包括:良繁田选择、种子选择、田间管理、收获、检测等关键技术.     

复杂疾病的遗传咨询技术

复杂疾病大面积爆发使人们的生活健康面临着重大挑战。在这一环境下,遗传咨询在人们的生活中占据了越来越重要的地位。依据基因与环境互作共同影响个体健康的原理,咨询者在遗传咨询师的指导帮助下合理解决各种遗传学问题可以有效降低复杂疾病的发病率。目前国内的遗传咨询发展尚处于萌芽期,随着遗传咨询在健康领域的地位上升,该技术在未来将会进一步推广应用。     

棉花单核苷酸多态性标记研究进展

单核苷酸多态性标记已在农作物研究中得到广泛应用并取得重大进展。为了便利棉花SNP(Single nucleotide polymorphism)标记的研究和应用,介绍了利用基因芯片、简化基因组测序、重测序等在棉花中开发SNP标记的方法 ,综述了SNP标记在棉花遗传图谱构建、数量位点的定位和分子标记辅助育种、基因组测序以及系统进化等研究中的应用。并对异源四倍体棉花中SNP标记开发时,同源序列位点和部分同源序列位点上的SNP标记辨别问题进行了系统探讨,对其快捷的开发、检测方式和在数量基因定位中的应用前景进行了展望。     

Field Evaluation of Cocksfoot,Tall Fescue and Phalaris for Dry Marginal Environments of South‐Eastern Australia. 1. Establishment and Herbage Production

Newly developed candidate cultivars of cocksfoot (Dactylis glomerata L.), phalaris (Phalaris aquatica L.) and tall fescue (Festuca arundinacea Schreb. = syn. L. arundinaceum (Schreb) Darbysh.) were evaluated over four years for persistence and productivity against current commercial cultivars in small plots at five locations selected for lower and less reliable rainfall and difficult soils (low pH and high Al) in south‐eastern Australia known to be marginally too dry for these grass species. The five locations were ‐ representing summer dominant rainfall, Inverell, in northern New South Wales (NSW); ‐ representing uniform rainfall; Trungley Hall, (medium rainfall), and Beckom (lower rainfall) both in southern NSW; and; representing a winter dominant pattern ‐ Eversley, (higher rainfall), and Bealiba, (lower rainfall), in central Victoria. The objective was to determine if the new candidate cultivars were more likely to persist and to be productive than current commercial cultivars. The study showed that most phalaris and cocksfoot treatments were highly productive in high rainfall years at one or both sites in southern NSW. However, all treatments had become much less productive by the end of the experimental period due to plant loss under hot, dry conditions in the final summer. At Bealiba in central Victoria, cocksfoot was the most productive species with several cocksfoot treatments of both subsp. hispanica and subsp. glomerata still present at the final harvest despite a hot and dry final summer‐autumn. Tall fescue was the most productive species in the two higher rainfall environments (Inverell, Eversley) although most treatments of all species performed well at those sites. Continental tall fescues were more productive on average than Mediterranean tall fescues at the strongly acidic Eversley site. As a result of this work, two of the new cocksfoot candidates (Moroccan Fine and AVH48 Selection) and one of the tall fescue candidates (Summer Active 1) have been licensed for commercial development and release.