1例罕见的犬网状细胞肉瘤

网状细胞肉瘤又称网状细胞增殖症，是淋巴网状系统的一种肿瘤。本病多见于鸡，猫也曾有过报道，国内在犬还未见报道，现介绍如下。１　病史１只２岁北京狮子犬，在包皮表面有红枣大小的肿块，经手术切除后，送病理室作组织病理学和电镜检查。２　肉眼观察患犬包皮表面有红枣大小的肿块，其大小为５－５ｃｍ×２－５ｃｍ，分叶，呈桑椹状，呈粉红色鱼肉样外观。质地柔软，脆弱，与周围组织界限明显，血管很丰富，一碰即出血，见图１。图１　包皮表面的肿块（↑）３　组织病理学变化肿瘤组织由大量形态和大小各异、呈圆形、梭形或星形的淋巴样…     

基于单片机的沼气发酵装置增温控制系统设计

北方沼气系统全年产气的关键是冬季加热增温问题.为此,以生物质炉为热源,通过对循环水的加热,用单片机控制加热水泵的增温系统,研究设计了系统的整体功能以及硬件和软件.该系统具有一定的智能性,保证了沼气系统在北方冬季时的正常运行,提高了产气量.     

沾化冬枣种植区农业生态地质环境调查研究

以沾化地区土壤质地、浅层土体构型、耕作层的含盐量、营养综合指数、浅层地下水埋深及矿化度6因素作为评价因子.对冬枣种植区农业生态环境地质质量进行综合评价,提出适宜冬枣种植的地质区划环境.     

自由基与水产动物营养的研究进展

<正>水产动物在疾病和应激时,机体会产生大量自由基。如果动物自身的抗氧化系统不能及时将自由基清除,将会对水产动物造成严重的氧化损伤。在水产饲料中添加外源抗氧化剂,可以减轻或消除自由基对水产动物的氧化损伤。随着自由基研究和水产动物营养学的     

Effects of Dietary Binders on Survival and Growth Performance of Postlarval Tongue Sole, Cynoglossus semilaevis (Günther)

A 30‐d feeding experiment was conducted in tanks to investigate the effects of four different binders (2% in microdiet) on the survival, growth performance, and specific activity of digestive enzymes in tongue sole, Cynoglossus semilaevis Günther, postlarvae (24 d after hatching, with initial average wet weight of 22.4 ± 6.65 mg [mean ± SD]). Five approximately isonitrogenous and isoenergetic microbound diets were formulated with carrageenan (Car), sodium carboxymethylcellulose (CMS), sodium alginate (SA), and gelatin (Gel) as binders, and a diet with no special binder as a control. A commercial diet (RQ Com., manufactured by Marubeni Nisshin Feed Co., Ltd., Chita, Japan) was used as another tested diet, and Artemia nauplii was used as live prey control. The results showed that the survival of the fish fed SA diet (31.3%) was significantly higher than that of fish fed CMS (21.8%), Car (10.8%), and control (21.8%) diets (P < 0.05), but significantly lower than that of the fish fed the live prey (54.5%) diet (P < 0.05). The results of growth followed the similar pattern as that of survival, although there were no significant differences in specific growth rate (SGR) among fish fed SA, CMS, Gel, the control, and RQ diets (7.2, 6.8, 7.0, 6.9, and 7.3% per day; P > 0.05). However, fish fed Car diet had a significantly lower SGR (5.9% per day) than fish fed other diets. Percentages of secreted amylase in fish fed artificial diets were not significantly different, but fish fed artificial diets had significantly higher (P < 0.05) secreted amylase than live prey group. Percentage of secreted trypsin in fish fed SA diet (54.9%) was relatively higher compared with other binders, and not significantly different from RQ Com. and live prey treatments. However, trypsin in fish fed Car diets (29.3%) was significantly lower than in other groups. Specific activities of alkaline phosphatase (AP) in the intestine and AP and leucine aminopeptidase N in brush border membranes in fish fed SA diet (264.6, 1882.8, and 187.2 mU/mg protein) were relatively higher compared with other binders. These results indicate that SA is one of suitable binders compared with carrageenan, CMS, and gelatin in microdiet of postlarval tongue sole.     

垂直圆盘式气吸排种器种子着地点原始误差数学模型的建立

使用气吸式播种机进行播种可大大提高作业效率,减轻劳动强度。针对目前垂直圆盘式气吸播种机在作业时存在种子着地误差较大的问题,分析其误差形成的原因与过程,建立相应的数学模型,为播种机具性能的改进提供理论依据。     

几种常用渔药对三疣梭子蟹Portunus trituberculatus(Miers)稚蟹的急性毒性试验

采用常温静水实验法.对Ⅰ～Ⅱ期梭子蟹稚蟹(平均体长0.2～0.3 cm)进行急性毒性试验,结果表明:在水温26.2～27.8℃F,6种渔用药物对梭子蟹Ⅰ～Ⅱ期稚蟹的96 h半致死浓度(96 h LC50)分别为硫酸铜1.4 mg/L、纤虫清2.5 mg/L、清苔净16 mg/L、二氧化氯3.7 mg/L、强力杀菌消毒剂4.2 mg/L、二溴海因36.8 mg/L;安全浓度(Sc)分别为硫酸铜0.47 mg/L、纤虫清0.62mg/L、清苔净4.1 mg/L、强力杀菌消毒剂1.1 mg/L、二氧化氯1.1 mg/L、二溴海因13 mg/L.梭子蟹对上述药物的敏感性分别为硫酸铜＞纤虫清＞三氯异氰尿酸钠＞二氧化氯＞二溴海因＞清苔净.其中硫酸铜、纤虫清的安全浓度相对较低,在梭子蟹养殖过程当中应谨慎使用.     

芦笋反季节栽培技术

滑菇又称滑子蘑,具有极高的营养价值、保健价值和商品价值,是健康、绿色、无公害食品。同时,滑菇生产也是岫岩县农村脱贫致富,建设小康社会一项重要产业,滑菇栽培过程中有以下几个方面的问题值得注意。选用新鲜、无霉变的原料,合理配方;选用适合的菌种,合理安排接种时间;培养料制备过程中对水比例的测算和拌料方法;严格掌握有效蒸料灭菌时间;严防错失装箱包盘的时机;严格控制接种室的温度,以防止污染;选择适宜的堆放地点;做好开包搔菌前的消毒工作;开包搔菌后的水分管理;出菇前发现杂菌和害虫应及时、彻底消灭;加强出菇期水分,温度,通风管理;适时采收。     

湘红菜薹一号的选育

湘红菜薹一号是以自交不亲和系９４１５－２和孤雌生殖系Ｊ－７－２配制的紫菜薹一代杂种，极早熟，从播种到始收４５天左右，早期产量高，菜薹亮紫色，无蜡粉，味甜，品质好，耐热，抗软腐病能力强，适应性广，适用于长江流域夏秋栽培和早熟秋冬栽培。     

夏季农家乐经营问题及对策

夏季气候炎热,城市周边的农家乐就遇到了很棘手的问题,游客人数锐减,生意惨淡,应该想办法解决这样的季节性经营问题,使农家乐走出夏季的经营困难.