Histology of some major immune system organs in Lake Van fish Alburnus tarichi (Güldenstädt, 1814) (Cyprinidae)

The teleostean immune system is variable between and within taxa in terms of morphology. Accordingly, in the current study, the histology of some immune organs (thymus, kidney and spleen) of Lake Van fish (Alburnus tarichi) was investigated. For this purpose, the tissues from eight mature fish were fixed and embedded in paraffin wax, and then the sections were stained with haematoxylin and eosin, Mallory’s triple, periodic acid-Schiff and Alcian blue (pH of 2.5) for histologic examinations. In the thymus, no clear discrimination of the cortex and medulla was observed. Lymphoid cells within a reticulo-epithelial network were the predominant cell type in the thymus. The other components in the thymus were macrophages and myoid, mast-like, plasma-like, cystic cells, Hassall’s corpuscles, and single or multiple epithelial cystic structures. In the kidney, the head kidney, a major haematopoietic site, consisted of lymphoid and non-lymphoid zones within a reticular network. Cells exhibiting mitotic figures were also detected in the haematopoietic tissue of the head kidney. Haematopoietic tissue was also found in the trunk kidney dispersed amongst the excretory components. The spleen was composed of red and white pulp. The red pulp comprised abundant erythrocytes, whilst the white pulp contained leucocytes with a reticular network. Ellipsoids were also determined in the white pulp. Melanomacrophage centres were found in all of the examined lymphoid tissues of the fish. These findings, which were reported, herein, for the first time will provide reference knowledge for future studies of this anadromous fish.     

应用计算机辅助识别进行棉花有色纤维的遗传分析

本研究应用计算机辅助色彩识别技术，对以白色棉冀851和棕色棉ZYS20作为亲本的杂交后代F2群体的棉花纤维颜色进行了分析，研究结果表明应用计算机辅助色彩识别技术获取棉花纤维红绿蓝(RGB)数据，适合对棉花有色纤维的颜色鉴定，获取的数据客观可靠可重复，值得在彩色棉育种中应用。对本研究的F2群体的分析表明，棉花纤维颜色的：RGB值的百分数在该群体中分离状况符合正态分布，符合多基因控制的数量性状遗传特征。     

菌杀星对仔猪白痢的疗效试验

用菌杀星对自然感染白痢病的仔猪进行治疗试验,结果表明此药对白痢病的治愈率达98％。     

药物对鸡尿酸清除率的影响

用分光光度计测定鸡尿酸清除率,比较了支肾囊霸和肾肿解毒药对尿酸清除率、尿量及尿液ｐＨ值的影响。结果发现常温下,支肾囊霸可提高鸡尿酸清除率,增加排尿量,降低ｐＨ值。虽然肾肿解毒药对这些生理指标亦影响,但影响程度不及支肾囊霸,临床实验也证明支肾囊霸对肾尿酸盐沉积的治疗效果较好。     

A Design of RBF Neural Networks Based on Genetic Algorithms

Genetic algorithms are proposed to automatically configure RBF neural networks.The network configuration is formed as a subset selection problem.Using new genetic operators,the genetic algorithms are improved in convergence and applicatility.The configuration and optimal principle of genetic algorithms are introduced.The method of generating the RBF networks is given.Finally,the simulated result on practical data is used to demonstrate the performance of the new algorithms.     

高吸水树脂对花生生长发育及产量的影响

研究了两种高吸水树脂对花生整个生育期的作用及其对产量的影响。结果表明:高吸水树脂能明显改善土壤的供水状况,增强抗旱能力,提高花生叶片的叶绿素含量,并促进光合产物的积累与合理分配,提高了经济系数和产量。     

不同来源水稻二倍体的比较

用几种不同来源的水稻二倍体为亲本材料进行配组，比较其后代之间的差异，从田间观察到分子标记的检测，没有发现这些二倍体之间有什么差别，说明从特异多倍体材料来源的二倍体和生产上常用的二倍体之间没有差别，可以作为亲开进行杂交，特异多倍体当中的遗传特性可以稳定地遗传下去。     

Genetic heterogeneity of bovine viral diarrhoea virus (BVDV) isolates from Turkey: identification of a new subgroup in BVDV-1

Genetic heterogeneity of Turkish ruminant pestiviruses was investigated by phylogenetic analysis of complete N(pro) encoding nucleotide sequences. A total of 30 virus isolates obtained from 15 provinces around the country between 1997 and 2005 were included in the phylogenetic analysis. Virus isolates mostly originated from cattle with one isolate from sheep. The bovine isolates all belonged to BVDV-1, the sheep isolate to BVDV-2. Fifteen isolates formed a new subgroup within BVDV-1, tentatively named BVDV-1l. The remaining bovine isolates were typed as BVDV-1a (n=4), BVDV-1b (n=4), BVDV-1d (n=3), BVDV-1f (n=2) and BVDV-1h (n=1). The isolates allocated to BVDV-1l originated from various geographical regions in different years. There was no correlation between genetic grouping and locations where isolates were obtained. Viruses originating from one farm in most cases belonged to the same subgroup (n=5). This study indicates that the newly detected subgroup BVDV-1l is predominant and widespread in Turkey. Moreover, an ovine virus isolate was identified as the first member of BVDV-2 reported in Turkey. A serological survey using samples from western Turkey indicated that BVDV-2 is also present in cattle.     

江苏省十四五节约用水潜力探究

本文分析了当前江苏省在节水型社会建设中面临的形势和现状用水水平,在此基础上深入探究了十四五期间农业、工业、生活领域的节水潜力.结合预测指标计算出农业、工业和居民生活各领域的节水潜力分别为3.81亿m3、1.41亿m3、0.83亿m3,总节水潜力为6.05亿m3.针对江苏省用水结构中农业用水占比较大、工业用水水平较先进水平仍有差距等特点,就下一步深入挖掘节水潜力提出了相关建议.     

VA菌根在磷锌关系中的作用

以玉米为材料,采用三室隔网模拟盆栽系统,研究了在施用不同磷肥水平条件下接种VA菌根对玉米生长及其锌吸收的影响。