The natural history of the parasitic wasp Trogus pennator (Hymenoptera: Ichneumonidae): Host‐finding behaviour and a possible host countermeasure

The parasitic wasp Trogus pennator (Ichneumonidae) attacks the larvae of swallowtail butterflies (Papilionidae). Female T. pennator were followed in the field as they searched for larvae of the zebra swallowtail butterfly, Eurytides marcellus (Papilionidae), feeding on Asimina (Annonaceae) in central Florida, USA. Predictions of host‐finding theory and interactions with the host were thus investigated in a natural setting. Wasps seldom flew to plants other than Asimina and apparently recognized the plants by visual cues. Plants were attractive regardless of host presence, as the wasps approached plants lacking E. marcellus feeding damage twice as often as they approached damaged plants. However, wasps approached damaged plants at a rate greater than their frequency in the Asimina population, indicating that they can detect host damage before they approach the plants. After approaching within 0.5?m of plants, wasps tended not to land on plants lacking feeding damage. A comparison of the plants they landed on, however, showed no consistent preferences for damaged plants. The weaker trends in the latter data indicate that the presence of feeding damage was not the sole criterion for landing, although it evidently influenced behaviour. After landing, wasps spent more time searching damaged plants than undamaged plants. Butterflies preferred to oviposit on plants shorter than those searched by T. pennator. Possible adaptive consequences of this phenomenon are discussed.     

多花黑麦草的形态与细胞结构解剖

本研究通过对多花黑麦草 (L olium multiflorum)的植株、花、果的形态特征及种籽的果皮、种皮、胚芽、胚根鞘和盾片的上皮细胞、胚乳的淀粉和糊粉层细胞的组织细胞结构进行鉴别比较和综合分析 ,尤其是对多花黑麦草籽实是否含有与引起同属的毒麦籽实产生毒麦硷 (Temuline- C7H12 N2 O)的类似寄生病菌进行了研究与探讨 ,为口岸杂草检验检疫和牧草的引进、生产提供依据。     

白腐菌对小麦秸秆腐熟的增效作用

采用室内堆肥试验,考察白腐菌对小麦秸秆的腐熟作用.结果表明：添加白腐菌的各处理均明显好于对照处理.与自然发酵的CK1相比,腐熟时间由30天,缩短为14天.与加了腐熟剂的CK2比较,发酵时间提前2-4天.腐熟剂处理木质素降解率为21.1％,添加白腐菌的T3处理降解率可达64.5％,较单独腐熟剂的对照处理降解率高43.5％.且综合考察秸秆腐熟效果,初步确定白腐菌添加量为10ml/750g.     

食用菌工厂化栽培环境计算机智能控制系统研发

将Modbus总线技术及WEB技术应用于食用菌工厂化栽培环境计算机智能控制系统开发,软件上采用C/S架构,控制系统服务端可实现数据采集处理及智能控制,并具有组态配置控制系统功能。客户端能够实现用户操作界面,可使用户远程并发连接服务端操作。另外,结合菇房环境控制需求,控制系统硬件利用RS485总线实现分布式控制结构,各子系统相对独立,易于扩展,同时提高可靠性。     

葛内生真菌Phoma macrostoma抗菌活性物质研究

从葛的茎中分离筛选得到一株具抗菌活性的内生真菌Phomamacrostoma.利用硅胶柱层析、凝胶Sephadex LH-20柱层析、薄层层析以及重结晶等各种分离纯化方法,首次从该植物内生真菌的发酵产物中分离到抗大肠杆菌、肺炎链球菌、番茄灰霉等具有广谱抑菌活性的一个化合物.经GC-MS及质谱分析,该化合物为邻苯二甲酸单(2-乙基己基)酯[mono-(2-ethylhexyl)phthalate].     

三种食用菌营养成分分析（简报）

竹荪（Dictyophora indusiata）、金针菇（Flammulina velutipe Singer）、猴头菇（Hericium erinaceus）属于担子菌亚门（Basidiomycotina），为食用真菌。竹荪又名竹笙、竹参，属鬼笔科，是一种珍贵的食用真菌，被国际社会公认为是“十分良好的蛋白质来源食品”，享有“现代保健食品”、“人类植物性食品的顶峰”等美誉。     

Modeling of Busbars in High Power Neutral Point Clamped Three-Level Inverters

The busbars in high power neutral point clamped three-level inverters are modeled using the Maxwell Q3D Extractor software, which is based on the partial element equivalent circuits method. The equivalent circuits of the busbars and devices model are simulated in the electric simulator PSlM to analyze the effects of the parasitic inductance on the switching characteristics of the integrated gate commutated thyristor （IGCT） in different topology positions. The simulation results agree well with the measured impedance analyzer results and the IGCT test results, which proves the effectiveness of the modeling method for the large, complex busbars.     

杜丝跳小蜂属1中国新纪录种(膜翅目:跳小蜂科)

记述了采自内蒙古锡林浩特的中国跳小蜂科1新纪录种——蚤状杜丝跳小蜂Dusmetia pulex(Ruschka, 1923).提供了新纪录种成虫的形态特征图及该属中国已知种检索表.     

河池学院校园寄生植物的危害及其防治

通过对河池学院校园寄生植物的深入调查，共发现了广寄生（Taxillus chinensis（DC．）Danser）等六种常见的寄生植物，归纳了寄生植物分布的七个主要特点，并说明其危害。用数理统计方法对调查数据进行整理分析，得出寄生植物侵害率较高的园林植物种类，提出生态校园建设及寄生植物防治的六点措施。     

大规模集成电路多层布线结构对信号延时的影响

通过集成电路各器件间的布线传递信号的过程，是将信号电荷向布线间形成的寄生电容充放电的过程。本文研究了集成电路多层连线的寄生电容模型、互连线RC树模型的延时估算等电路模拟技术，同时提出了今后该领域的研究方向。