Natural parasitism of<Emphasis Type="Italic">Chrysoperla carnea</Emphasis> by hymenopterous parasitoids in cotton-growing areas of Çukurova,Turkey

A 4-year study of parasitoids attackingChrysoperla carnea (Stephens) in the cotton fields of Çukurova, Turkey, revealed the activities of three principal taxa:Telenomus sp. nr.suvae attacks the eggs ofC. carnea: Catolaccus sp. andBaryscapus sp. are larval and pupal parasitoids, respectively. In general, percent egg parasitism increased starting from the second half of June and into July, then decreased until the beginning of August before rising again at the end of growing season. During the early season, weekly parasitism was found to be as high as 94%. Overall, seasonal egg parasitism varied between 13.6% and 62.0% among all study sites. According to the results of a one-year field study at Hac?ali, total larval and pupal parasitism was found to be 12.5% and 55.6%, respectively. Therefore, different factors influencing the effectiveness of the generalist predatorC. carnea against cotton pests, and the differential effects of cotton treatments on both host and parasitoids, need to be evaluated.     

美国红鱼养殖种群的同工酶酶谱及其生化遗传初步分析

利用水平淀粉凝胶电泳技术，对50尾美国红鱼肌肉及肝脏组织进行了14种同工酶的初步分析。结果表明，美国红鱼多态位点比例P＝0.292，实际平均杂合度Hp=0.057，预期杂合度He=0.108，每个位点的有效等位基因数Ae=1.108，Hardy-Weinberg遗传偏离指数D＝－0.472。     

Effect of weight and apllied force on the friction coefficient of the spunlace nonwoven fabrics

Friction force that can be defined as the forces resisting relative to the movement between two surfaces contacting with each other plays an important role in textile industry. During usage, the fabrics continue to friction to the textile or the other surfaces and because of this problem fabric surface structure deteriorates. Therefore, most of the scientists have been designed different methods in order to estimate surface properties and friction of fabric before their usage. In this study, friction experiments have been performed by designed and manufactured two different systems which work as a horizontal platform and inclined plane. It has tried to investigate friction properties of polyester nonwoven fabric samples which are produced by spunlace methods (air laid and spunlace bonding) with different weights. While the selected fabric samples weight increase, it has been seen that a low friction force occurred because of more stable structure. And also, it has been observed that the higher vertical force (load) applied on the specimens the lower the coefficient of friction. These results shows that both measurement methods have similar tendencies based on the analyzed results.     

几种土壤的氟吸附特性研究

采用室内试验方法,研究了4种土壤对氟吸附的特性。结果表明:(1)不同土壤对氟的吸附能力差异很大,随着初始浓度的增大,吸附量明显增大,净吸附量、解吸量也增大,表现为黄壤>红壤>紫色土>石灰土;土壤氟的解吸率随初始浓度的增大而增大,不同土壤间大小次序是石灰土>紫色土>红壤>黄壤。(2)土壤吸附氟后的平衡溶液pH值随氟加入浓度的增大而上升,不同土壤间次序是:石灰土>红壤>紫色土>黄壤。(3)拟合结果表明,Langmuir方程能够较好地拟合土壤对氟的吸附等温线。(4)土壤中氧化物是氟的重要吸附剂,对土壤氟吸附有重要贡献。(5)低分子有机酸对氟吸附的影响一方面表现为阴离子的竞争作用,另一方面表现为酸性条件下的促进作用。     

Application of western blotting procedure for the immunodiagnosis of visceral larva migrans in mice by using excretory/secretory antigens

A Western blotting procedure with excretory/secretory antigens from Toxocara canis larvae was developed for immunodiagnosis of visceral larva migrans in mice. In this study, eighty Swiss albino mice were allotted into two groups of 40 each as control and experimental groups, and T. canis ova containing infective larvae were given to mice in the latter group to form visceral larva migrans. Blood samples were taken from 5 infected and 5 control mice on days 25, 30, 35, 40, 45, 50, 55, and 60 after infection. After bleeding, the mice were necropsied. Slides were prepared from their brain tissues and examined for visceral larva migrans. Following this procedure, their guts were also examined for intestinal parasites. Protein bands of excretory/secretory antigens of 2nd stage larvae of Toxocara canis were determined by using SDS-PAGE. Sera from the mice were tested by Western blotting and results were compared to the protein bands obtained by SDS-PAGE to determine specific bands. Specific protein bands for visceral larva migrans were determined as 24, 28, and 48 kDa according to our test results.     

Evaluation of ethyl methanesulfonate-induced in vitro mutagenesis,polymorphism and genomic instability in wheat (Triticum aestivum L.)

Journal of Crop Science and Biotechnology - Wheat (Triticum aestivum L.) is highly rich in nutrients and is an important staple food for humankind. Mutation breeding offers a relatively quick...     

Meat Yield,Condition Index,and Biochemical Composition of Mussels (Mytilus galloprovincialis Lamarck, 1819) in Sinop,South of the Black Sea

Monthly variations in meat yield and biochemical composition of Mediterranean mussels on lantern nets were investigated from May 2005 to May 2006, in Sinop, south of the Black Sea. Dry weight condition index was between 2.66 and 7.10% with a mean of 4.86 ± 0.36%. Meat yield was maximum (26.69%) in March and minimum (17.43%) in October. Moisture values were between 78% (in June) and 86% (in April). Protein content in dry weight of mussels reached the highest value in February (74.64%) before the spawning time. Lipid value was maximum (18.03%) in May 2005.     

Pathogenicity of four native isolates of entomopathogenic nematodes against Tribolium confusum Jacquelin du Val (Coleoptera: Tenebrionidae)

Journal of Plant Diseases and Protection - The confused flour beetle, Tribolium confusum Jacquelin du Val, 1863 (Coleoptera: Tenebrionidae) is a major pest on stored grains. Chemical pesticides are...     

一例楼房猪场的实际应用

随着技术发展,楼房养猪因其节约土地资源等优点逐渐被推广开来,也有一些比较成功的案例.北京中育种猪有限责任公司在北京市平谷区峪口镇新建一座种猪场,采用楼房养猪工艺生产.文章就该猪场的建设及工艺做详细介绍.     

Hormone-mediated maternal stress affects embryonic development during incubation without adverse effect on chick weight and body composition

1. The objective of this study was to evaluate the effect of maternal stress (MS) induced by supplementing the hen’s diet with 2 mg/hen/d dietary corticosterone (CORT) on embryonic development, biochemical blood parameters and hatching performance of broiler chicks.

2. A total of 200 Ross broiler breeder hens at 42 weeks of age were randomly divided into two groups: MS or control. Hens in the MS were fed 2 mg/hen/d CORT for 14 d. Eggs (648 and 635 eggs for MS and control, respectively) were collected from d 3 to 14 of dietary CORT supplementation and incubated. Weights of embryo, chicks and organs and body composition were determined during incubation and at hatch. Biochemical blood parameters were measured at internal pipping stage and day of hatch. Hatching performance and embryonic mortalities were recorded.

3. Hens fed a diet supplemented with CORT had lighter body weight and produced less eggs at the end of the 14-d treatment period. Although MS embryos were heavier than control from 12 to 18 d of incubation, chick weight was similar at the day of hatch. Lower relative weights for yolk sac and bursa were observed at 12 d of incubation for MS chicks compared to control. Chicks from both groups had similar body content in spite of higher fat content of MS embryos on d 18 of incubation.

4. MS had no effect on the duration of incubation or hatching performance but increased mortality at the pipping stage.

5. The results suggest that hormone-mediated MS might affect embryonic development during incubation without adverse effect on chick weight and body composition.