新疆地区啤酒花害的发螨生特点及其防治

对新疆地区啤酒花上的土耳其斯坦叶螨 Tetranychus turkestani Ugarov et Nik-lski 的生物学、发生特点及防治对策进行了初步探讨。该螨寄丰广,为害啤酒花叶片和球果。在啤酒花的毛蕊期和球果生长期有2个发生高峰。本文以啤酒花越冬期,营养生长期、生殖生长期害螨和天敌发生特点,提出了不同的防治方法和技术关键。     

水电站虹吸式进水口的控制

在对河北省几座已建虹吸式进水口水电站的虹吸控制方式进行分析对比的基础上,给出了一种采用液气射流泵将虹吸体抽成“低管”正虹吸,用“Y”形管中的水封保持真空,事故时利用“高管”自动补气破坏真空的控制系统,并分析了该系统的特点,给出了设计计算方法及计算公式。     

植物活体水分探测仪的研制及测试初报

利用NIM插件探测器及金硅面垒探头组装了植物活体水分探测仪;筛选并分析了仪器的最佳工作条件;检测了春小麦、玉米、苜蓿、豌豆、红豆草叶片鲜重的变化。结果表明;叶片水分随时间损失大的,其抗旱性差。叶片保水的秩序为:红豆草、豌豆>苜蓿>春小麦>玉米。     

Isolation, characterization and in vitro mitogenic stimulation of peripheral blood lymphocytes from an American buffalo.

A rapid and reproducible method is described for the isolation and characterization of leukocytes from the peripheral blood of an American buffalo (bison). Centrifugation of the buffy coat cells on a Percoll gradient (1.079 g/mL) at 650 x g for 20 min resulted in the separation and high yields of pure viable leukocytes. The sheep erythrocyte-rosetting technique (ER) showed that 59% of the cells were ER+ (T lymphocytes). Fluorescein isothiocyanate (FITC)-conjugated peanut agglutinin and FITC-conjugated concanavalin A revealed 77% and 89% positive cells, respectively. The isolated leukocytes contained adherent accessory cells and functionally active T and B lymphocytes which proliferated in response to both T and B cell mitogens and to exogenous recombinant bovine interleukin-2 in the absence and/or presence of the thiol compound 2-mercaptoethanol.     

T型杂种小麦主要农艺性状亲子相关分析

T 型杂种小麦的研究在经历了近30年的研究历程之后,取得了重大进展,所谓杂种恢复度与恢复系恢复力问题已基本得到解决,国内外均有 T 型杂种小麦进入较大面积的生产。选配强优势组合以及探讨强优势组合选配规律则成为目前 T 型杂种小麦研究的重点内容之一。     

Reproductive biology of the female Japanese mantis shrimp Oratosquilla oratoria (Stomatopoda) in relation to changes in the seasonal pattern of larval occurrence in Tokyo Bay, Japan

ABSTRACT:   The reproductive traits and the monthly larval abundance of the mantis shrimp Oratosquilla oratoria were investigated in Tokyo Bay, Japan, in 2002. The goal of the study was to elucidate the cause of changes in the monthly pattern of larval abundance from the 1980s to the 1990s as these changes relate to variation in the stock size of the adult shrimp. Oogenesis was divided into 10 stages by histological observation. The developmental stage of oocytes in an individual's ovary was synchronous, suggesting that almost all the oocytes in an ovary are spawned at the same time. The size at first maturity was estimated to be 7 ≤ body length ( BL ) < 8 cm. Fecundity was expressed as a function of BL , ranging from 19 300 eggs for 8 cm BL to 92 100 eggs for 14 cm BL . Small female shrimps (<10 cm BL ) spawned around August. Most large female shrimps (≥10 cm BL ) spawned around May, and some large female shrimps also spawned until September. Although most large female shrimps spawned in spring, the larval abundance was low before July and high from August onwards. The results suggest that a substantial decrease in the stock size of large individuals causes the low larval abundance before July.     

苏云金杆菌与杀灭菊酯防治红铃虫的试验

苏云金杆菌(Bailus thuringiensis)140或018工业菌剂每亩用200～255克,加杀灭菊酯20%乳剂每亩8毫升混用防治第二、三代红铃虫,虫口减退率和铃害下降率分别为80.5～93.4%和68.8～84.6%;杀灭菊酯每亩40毫升单用效果分别为96～97.2%和84.6～95.8%,都能有效控制红铃虫的危害。棉花产量测定表明,菌剂加菊酯混用使皮棉增加21.3～30.9%,菊酯单用增加11.4%。     

Modifying the response to defoliation during vegetative growth in CERES-Maize

CERES-Maize (Vl. 0) predicted no grain yield when 100% defoliation occurred during vegetative growth. This result conflicted with field observations where 100% defoliation early in the vegetative stage did not materially reduce grain yield. CERES-Maize was modified to realistically predict yields when defoliation greater than 50% occurred during vegetative growth by taking into account stem (stem proper and sheath) photosynthesis and translocation of dry matter from the stem to the developing leaves. With these modifications, predictions from CERES-Maize were in good agreement with field measurements when defoliation occurred both early and later in the vegetative stage. This modified version of CERES-Maize can be the basis of a decision support system for defoliating pests of corn where yields can be evaluated under different management strategies and climate scenarios.     

山楂缺铁黄叶病及应用硝黄铁防治研究

根据调查初步总结出山楂缺铁黄叶病的发生发展规律、致病因素及其对山楂生产的危害。用新研制的高效价廉、储运方便的硝黄铁矫治,效果明显。黄化病株复绿率40%～87%,三级病株减少36%～100%,叶绿素含量提高64%～224%,喷肥区比对照区株产提高25%。同时增加了果实中糖、酸、果胶及钙、铁含量,提高了果实品质。