大银鱼卵细胞粘丝扫描电镜观察

用扫描电镜观察了大银鱼的第Ⅲ时相，第Ⅳ时相，第Ⅴ时相卵母细胞和受精卵的卵细胞粘丝的外部形态特征和它们的粘性，并讨论了卵细胞粘丝的功能。     

A biological screw in a beetle's leg

The coxa-trochanteral joints on the legs of the weevil Trigonopterus oblongus (Pascoe) work as a biological screw-and-nut system. The apical portions of the coxae closely resemble nuts with well-defined inner threads covering 345°. The corresponding trochanters have perfectly compatible external spiral threads of 410°.     

富水水库太湖新银鱼繁殖生物学研究

对富水水库太湖新银鱼性腺发育、生殖群体、生殖力和产卵场和卵母细胞粘丝等进行了研究,结果表明：春季产卵群体数量占９９％,生殖季节为２￣４月,盛产期为２月底到３月上旬;产贸场主要分布在库湾;卵母细胞粘丝为粗细不同的短丝、其间距不等、长短不一且呈辐射型分布。     

Spermatophore web formation in a pseudoscorpion

The male pseudoscorpion Serianus sp. n. deposits spermatophores without mating, but only when females are present. It marks a path to the spermatophore with silken threads produced in an endodermal gland, which is homologous to the rectal pocket in males and females of other species and in the female of the same species.     

Heliacus (Gastropoda: Architectonicidae) symbiotic with Zoanthiniaria (Coelenterata)

Eight species of Heliacus are obligate symbionts with Zoanthus and Palythoa, colonial zoanthid sea anemones. The gastropods live among Zoanthus polyps and under the edges of Palythoa incrustations, on which they feed and to which they and their egg masses are attached with sturdy but elastic mucous threads.     

Software for the geometric characterisation of insect-proof screens

Novel software has been developed for the geometric characterisation of agrotextiles intended for installation in greenhouse vents as a means of crop protection. This characterisation of insect-proof screens is essential with a view to keeping insects out and also from an aerodynamic point of view. The method of analysis is based on digital images taken by microscope or scanner. The geometric procedure considers that each hole of the screen represents a quadrilateral, as it is defined by four threads of monofilament that cross over each other. The software developed using Visual Basic allows us to identify the coordinates of the vertices of the quadrilaterals and therefore to carry out a complete characterisation of the agrotextiles: number of threads per unit length, porosity of the sample, dimensions of the holes, thickness of the threads, area of the holes and the largest circle contained in the holes. The analysis of the data provided by the software allows us to study the uniformity of the material and also to detect flaws in its manufacture. The software includes a pattern for identifying the vertices with a high percentage of accuracy. For instance, it analysed over 40,000 vertices with only 1.14% error, mostly due to dirt on the screen. The software developed includes procedures to detect these errors, to alert the user to the type of error and to correct them. There is no other specific procedure to measure the characteristic dimensions of insect-proof screens and, therefore, it is no possible to contrast in this way the results that are obtained with the proposed method. Consequently, the measurement method has been verified using a set of screens of known dimensions manufactured for this very purpose. The results obtained are excellent, revealing that the differences between the expected values and the measured ones are well below the sensitivity of the device used to obtain the digital images.     

Induction of pre-infection thread structures in the leguminous host plant by mitogenic lipo-oligosaccharides of Rhizobium

Root nodules of leguminous plants are symbiotic organs in which Rhizobium bacteria fix nitrogen. Their formation requires the induction of a nodule meristem and the formation of a tubular structure, the infection thread, through which the rhizobia reach the nodule primordium. In the Rhizobium host plants pea and vetch, pre-infection thread structures always preceded the formation of infection threads. These structures consisted of cytoplasmic bridges traversing the central vacuole of outer cortical root cells, aligned in radial rows. In vetch, the site of the infection thread was determined by the plant rather than by the invading rhizobia. Like nodule primordia, pre-infection thread structures could be induced in the absence of rhizobia provided that mitogenic lipo-oligosaccharides produced by Rhizobium leguminosarum biovar viciae were added to the plant. In this case, cells in the two outer cortical cell layers containing cytoplasmic bridges may have formed root hairs. A common morphogenetic pathway may be shared in the formation of root hairs and infection threads.     

A disulfide-linked collagenous protein of nematocyst capsules

The major protein component present in the capsule and thread of a sea anemone nematocyst consists of monomers of a collagen-like protein linked by disulfide bonds. Purified nematocyst capsules and threads are rich in hydroxyproline, and dissolved by disulfide reducing agents. Electrophoresis of the dissolved component on acrylamide gel results in a single detectable protein band.     

Flotation of the Bivalve Corbicula fluminea as a Means of Dispersal

Small specimens of the Asiatic bivalve Corbicula c.f. fluminea (Müller) secrete long mucous threads through their exhalent siphons that act as draglines to buoy the animal into a water column. These mucous strands, secreted in response to water current stimuli, are produced by dense accumulations of ctenidial mucocytes and may help in the downstream or interstream dispersal of this rapidly spreading exotic clam.     

毕节地区主栽杂交玉米对丝黑穗病的抗性评价

连续2年对毕节地区主栽杂交玉米品种,在人工接种条件下进行丝黑穗病的抗性试验。结果表明,品种间抗性存在明显差异。10个参试品种中,毕单10号、临奥4号、海禾1号为高抗品种,毕玉2号、毕单4号、毕玉4号、贵毕302、黔西4号为中抗品种,贵毕301、安单136为高感品种。     

大豆红蜘蛛发生及防治

介绍了大豆红蜘蛛形态特征及防治技术。大豆红蜘蛛害虫是该省大豆的主要害虫,成螨和若螨群集于叶背面结丝成网。吸食汁液。严重影响大豆的生长发育。药剂防治推荐使用1．8％阿维茵素乳油每亩15ml喷雾．或使用20％螨虫同杀乳油等药剂对适量水喷雾防治。     

监利老江河浮游植物初级生产力与主要生态因子的关系

１９９１年６月至１９９３年４月测得监利老江河浮游植物初级毛生产量年平均为（Ｏ２）１．５６ｇ／ｍ２·ｄ－１,年平均总毛生产量为１０４９７ｔ氧;鱼类生长期（４～１０月）浮游植物初级毛生产量平均为（Ｏ２）２．１７ｇ／ｍ２·ｄ－１,４～１０月总毛生产量为８３８５ｔ氧,占年总毛生产量的７９．８８％。水温、透明度和氮、磷营养元素是影响老江河浮游植物初级生产力的主要因素。经过估算,监利老江河四大家鱼种质资源天然生态库鲢鳙鱼产力为１３２．９ｔ左右。     

Polyphenolic Substance of Mytilus edulis: Novel Adhesive Containing L-Dopa and Hydroxyproline

The fouling marine mussel Mytilus edulis attaches itself to various substrates by spinning byssal threads, the adhesive discs of which are rich in the amino acid 3,4-dihydroxyphenylalanine (dopa). An acid-soluble protein was extracted and purified from the phenol gland located in the byssus-secreting foot of the animal. This protein is highly basic and contains large amounts of lysine, dopa, and 3- and 4-hydroxyproline. The composition of this protein and its sticky tendencies in vitro strongly suggest that it contributes to byssal adhesion.     

网络监测系统的设计与实施

基于目前网络中心管理的需要，设计了一种被动监测子网络到网络中央通信状况的监测系统；该系统充分利用局域网内截获数据和主动探测的原理，并结合了多线程的思想。     

Chains of particles in shear flow

Interesting physical models of threads, rouleaux of red blood cells, and other flexible structures (including macromolecules) have been prepared with chains of spheres and discs. When suspended in a viscous liquid undergoing shear flow, the aggregates rotate as nearly rigid bodies, even though they have no tensile strength or stiffness until shear rates high enough to cause bending and then breaking are reached. By adding a second liquid phase which causes a meniscus to bridge adjacent particles, sufficient tensile strength can be provided to cause bending without breakage.     

Threads in the hagfish slime gland thread cells: organization, biochemical features, and length

Scanning electron microscopy in conjunction with cell isolation procedures revealed details of the packing of threads in hagfish slime gland thread cells. Biochemical studies indicate that the thread is largely composed of a protein subunit with a molecular weight of 63,500. Mathematical calculations suggest that the thread may attain lengths of 60 centimeters or more.     

Java语言多线程技术及应用探讨

多线程编程是Java语言的一个很重要的特点.它是面向对象程序设计的关键技术之一.本文简要的探讨了Java语言多线程的基本技术,就线程的创建、线程控制和调度及线程同步等处理技术做了相关探讨.     

一种改进的多线程模型

针对一般多线程模型和单一基于前瞻执行的多线程模型存在的问题，从平衡负载和充分利用处理机资源出发，提出了改进的分组基于前瞻机执行的多线程模型，这种模型体现了线程与进程之间线程共享进程所拥有资源的关系，在此模型基础上给出了进程迁移的方法，该模型具有可扩展性和可重构性。     

崇明金瓜种质资源鉴定及加工性状的综合评价

对收集的53份金瓜种质资源进行了鉴定,筛选13份优良种质材料,按金瓜加工性状评价标准,对瓜形、单瓜重、瓜皮色泽、成丝率、脆度等7个主要性状综合分析。结果表明：CM025、CM005、CM012的加工性状表现良好。     

林地不同清理方式对18年生杉木生长的效应

炼山是我国南方营造杉木林最常用的林地清理方式,林地通过不同方式清理后栽植杉木,18年后对其生长效应进行了分析,结果表明:炼山处理的杉木各年份的平均胸径均较不炼山大,其差异在第6年时达最大值,其后呈逐年下降趋势,树高在第12年前不炼山大于炼山,12年后不炼山超过炼山,第15年后两者的差距呈缩小趋势.不炼山对杉木生长的影响要在9年后才能得到显示.