北方地区博落回乙醇粗提物对两种蚜虫的毒力测试

[目的]探讨产自北方地区的博落回（Macleaya cordata）乙醇粗提物的毒力。[方法]利用博落回乙醇粗提物对麦长管蚜和桃粉蚜进行玻片浸渍法室内毒力测定。[结果]麦长管蚜与桃粉蚜24 h的LD50依次为0.052 9 g/L与147.481 8 g/L;而48 h的LD50依次为0.003 9 g/L与0.012 3g/L。[结论]北方地区博落回在蚜虫防治方面有一定的应用价值。     

感染紫斑病的大豆种子主要生产指标测定

采集了带有紫斑病的‘合丰47号’大豆种子,在室内进行发芽率、脂肪和蛋白质含量检测,并在田间播种不同染病严重度病种,研究其对大豆产量的影响。结果表明,感染大豆紫斑病的种子发芽率、脂肪含量和产量与其病害严重度呈负相关,蛋白质含量与其病害严重度呈正相关,且病害严重度与产量相关性达到显著水平。     

A study of manatee leukocytes using peroxidase stain

Leukocytes of the manatee, dog, cat, horse, rabbit, bird, and human were stained with modified Wright-Giemsa stain and myeloperoxidase stain. The predominant segmented leukocyte of the manatee stained positive for myeloperoxidase in a manner similar to the human, dog, cat, and horse neutrophil. Rabbit and bird heterophils stained unlike the manatee predominant leukocyte with myeloperoxidase stain. Eosinophils of all species examined also stained differently from the predominant manatee leukocyte. We conclude that the predominant segmented cell type of the manatee is not biochemically similar to the heterophil of the bird and rabbit or to the eosinophil of the human, dog, cat, horse, bird, and rabbit.     

盐穗木转录因子HcSCL13基因的时空表达和胁迫响应特性

【目的】研究盐生植物盐穗木HcSCL13基因的时空表达和胁迫响应特性。【方法】将该基因全长启动子(2 230 bp)及截短序列与GUS报告基因融合,检测遗传转化后植物的GUS组织化学染色及酶活力。【结果】在稳定整合HcSCL13启动子的转基因拟南芥中,从种子萌发到种苗形成的过程中,地上和地下部位均表现出较强的启动子活性;随着植物的生长发育,启动子活性表现出一定的组织特异性;HcSCL13基因启动子对光、盐及机械损伤等胁迫积极响应。启动子上游-1 124-1 450 bp是影响其活性的区域,而上游-1 730-2 230 bp为盐响应区域。【结论】盐穗木HcSCL13基因的表达具有时空特异性及对光、盐和机械损伤等因素的响应特性。     

Modelling of the behaviour of free water in sapwood during drying

Abstract

A stochastic three-dimensional model for the behaviour of free water in wood, which was described in Part I, is used for the simulation and analysis of some further features of wood drying. The kiln brown stain mechanism is studied and the connection to the condition of the wood surface is pointed out. Several drying rate questions and related aspects are analysed and compared with experimental results. Finally the risk of surface checking in an early stage of sapwood drying is shown theoretically.     

Cytologic Features of a Meningioma in a Dog

Meningiomas are one of the most common nervous system tumors in dogs. They are mostly solitary, benign, intracranial tumors of the transitional type. Tentative diagnosis can usually be made on historical data, clinical and neurological signs, and radiographs, with an antemortem diagnosis confirmed by exploratory surgery and histologic evaluation of biopsy. The literature contains many reports of the gross, histological and ultrastructural morphology of canine meningiomas, but little on the cytologic features of these tumors. This report describes the cytologic appearance of an intracranial meningioma in a 9-year-old Miniature Schnauzer.     

板栗加工中褐变现象的研究

板栗是一种加工贮藏难度大的干果,因加工糊化而产生的褐变问题严重限制了板粟的开发利用.对极粟加工糊化中褐变的成因作了实验分析和理论上的探讨.结果表明,单宁与Fe3 氧化成色以及Maillard反应是引起栗果褐变的主要原因,并且温度、水分、pH值、氧化还原剂、糖分等对Maillard褐变有影响.并提出了板栗贮藏加工时的护色处理方法。     

禽脑脊髓炎病毒VR株的致病性研究

为探索禽脑脊髓炎病毒强毒VR株对SPF鸡的致病性,开展了不同接种途径和不同日龄SPF鸡的致病力试验。不同接种途径致病力试验结果表明,AEV VR株口服后不能引起发病;刺种、肌肉注射途径接种随着日龄增大,发病率降低;脑内注射途径接种可引起试验鸡全部发病。最小致病量试验结果显示,VR株脑内注射攻毒的最小致病量为10~(2.0) EID_(50)。不同日龄SPF鸡的致病力试验结果表明,随着试验鸡日龄的增大,其致病力略有差异,日龄越小,发病率越高。结果表明,AEV VR株脑内攻毒70日龄内SPF鸡的发病率为80%及以上,攻毒剂量为10~(4.0)EID_(50)。     

引起橡胶和马尾松木材蓝变的真菌—可可球二孢

可可球二泡(Botryodiplodia theobromae Pat.)早在1879年就被Cooke发现,目前,至少拥有48个异名,常见的异名是Diplodia theobromae(Pat.)Nowell,Diplodia natalensis PoleEvans,Lasiodiplodia theobromae(Pat.)Griff.＆ Maubl。Punithalingam和Sutton分别对该菌作过详细的评述。它广泛分布于热带、亚热带和温带。其寄主植物已知约500种,它不但引起植物病害,而且还引起木材蓝变,是引起热带阔叶树木材蓝变的主要真菌之一。虽然国外对这种真菌已进行了大量研究,但国内研究尚少,由它引起的木材蓝变,国内尚未见报道。