小蜉属一新种：蜉蝣目：小蜉科

本文报导采自江苏宜兴的小蜉属(Ephemerella Walsh)一新种,宜兴小蜉(Ephemerella Yixingensis sp.nov.)并对新种形态特征作了详细描述。     

4种卷柏科植物小孢子的形态研究

本文利用扫描电子显微镜对大叶卷柏(Selaginella bodinieri Hieron.)、疏松卷柏(S.effusa Alston)、具边卷柏(S．limbata Alston)、海南卷柏(S．rolandi-principis Alston)4种卷柏小孢子进行观察,描述分析其形态结构,并与光学显微镜下的观察结果做对比,本次观察对传统处理扫描电子显微镜样品的方法进行改进,节省了可利用空间,减少了污染。本文为卷柏科系统分类学和孢粉学补充了有价值的资料。     

锯形蜉属一新种记述：蜉蝣目：小蜉科

详细描述了锯形蜉属一新种 －膨铗锯形蜉成虫的形态特征，并与本属其他种进行了比较。     

几种溪流蜉蝣稚虫致死溶解氧浓度的初步研究

本文通过对南京近郊三个科、四个种蜉蝣稚虫(南京宽基蜉Choroterpesnan jingensis You et al.紫金吉氏蜉Gilliesia zijingensis sp.nov.Gui et Zhang.细蜉蝣Gaenis sp.及扁蜉蝣Heptagenia sp.)致死溶解氧浓度的研究。指出紫金吉氏蜉和南京宽基蜉、扁蜉蝣分别在不同要求下为良好的污染指示生物。     

小腔游仆虫形态和形态发生的研究

本工作主要采用蛋白银染色技术对小腔游仆虫形态和形态发生进行了描述和研究,从银线系角度及发生角度上证明该虫尾部的四根棘毛的来源不同,由此建议把左边两根看成是左缘棘毛减少至两根的情形并称之为左缘棘毛,讨论了长期存在混淆的区别,并验证本实验所用材料为前者。     

闭式水循环系统几种局部控制方式的水力稳定性分析

针对目前闭式水循环系统的几种常见局部控制方式，进行了被控部分水力稳定性的对比分析。     

小腔游仆虫Euplotes aediculatus形态和形态发生的研究

本工作主要采用蛋白银染色技术对小腔游仆虫Ｅ．ａｅｄｉｃｕｌａｔｕｓ形态和形态发生进行了描述和研究,从银线系角度及发生角度上证明该虫尾部的四根棘毛的来源不同。由此建议把左边两根看成是左缘棘毛减少至两根的情形并称之为左缘棘毛。讨论了长期存在混淆的Ｅ．ａｅｄｉｃｕｌａｔｕｓ和Ｅ．ｅｕｒｙｓｔｏｍｕｓ的区别,并确证本实验所用材料为前者。     

几种低电压、微功耗、小尺寸的放大器

MAX2630、MAX2631、MAX2632、MAX2633是几种低电压、低噪声的放大器，其工作频率从VHF一直到微波频段，封装形式为表面贴装，因此具有体积小、重量轻特点。     

中国卷柏科植物的研究(Ⅲ)——3种卷柏小孢子形态的观察

本文利用光学显微镜和扫描电子显微镜较详细地观察了细叶卷柏SelaginellalabordeiHieron .、异穗卷柏S .het erostachysBaker、蔓出卷柏S .davidiiFranch .的小孢子 ,重点对所观察小孢子的形态特征 (分别从形状、大小、三裂缝、纹饰等方面 )进行了描述 ,并讨论了各种之间的差异 ,丰富了卷柏科孢粉学研究资料 .     

几种烟草品种花粉形态的研究

本文采用光学显微镜和扫描电镜,对我国栽培的晒烟、烤烟、香料烟、白肋烟４个类型８个品种的花粉形态进行了比较研究,结果表明,不同品种之间花粉形态存在一定的差异,烟草品种的花粉形态研究不仅丰富了烟草孢粉学资料,而且也为鉴定不同烟草品种提供了花粉形态方面的实验证据。     

Skeletons of terrestrial cetaceans and the relationship of whales to artiodactyls

Modern members of the mammalian order Cetacea (whales, dolphins and porpoises) are obligate aquatic swimmers that are highly distinctive in morphology, lacking hair and hind limbs, and having flippers, flukes, and a streamlined body. Eocene fossils document much of cetaceans' land-to-water transition, but, until now, the most primitive representative for which a skeleton was known was clearly amphibious and lived in coastal environments. Here we report on the skeletons of two early Eocene pakicetid cetaceans, the fox-sized Ichthyolestes pinfoldi, and the wolf-sized Pakicetus attocki. Their skeletons also elucidate the relationships of cetaceans to other mammals. Morphological cladistic analyses have shown cetaceans to be most closely related to one or more mesonychians, a group of extinct, archaic ungulates, but molecular analyses have indicated that they are the sister group to hippopotamids. Our cladistic analysis indicates that cetaceans are more closely related to artiodactyls than to any mesonychian. Cetaceans are not the sister group to (any) mesonychians, nor to hippopotamids. Our analysis stops short of identifying any particular artiodactyl family as the cetacean sister group and supports monophyly of artiodactyls.     

多种体系中黄连素和NAC抗氧化活性的研究

采用硫代巴比妥酸比色法,彗星电泳,SDS-PAGE法检测了黄连素与NAC单独或联合时对脂质过氧化、DNA损伤、蛋白质氧化降解的保护;用邻苯三酚自氧化法、甲基紫法和DMPD·+法检测了二者对超氧阴离子、羟自由基和DMPD·+自由基的清除能力.结果表明,黄连素具有良好的抗氧化效果,且呈浓度依懒性.黄连素浓度为30μmol/L时对超氧阴离子清除率达到22.01%,150μmol/L时接近100%.在与NAC联合后,作用强于二者单独作用的效果,但稍低于二者单独作用的叠加.黄连素在清除羟自由基,浓度为10μmol/L时,清除率已达到95%,联合NAC作用后,却显示了负协同效应.相比而言黄连素对DMPD·+的清除能力较弱,黄连素浓度为80μmol/L时,对DMPD·+自由基的清除率为3.6%,而NAC与黄连素联用后,清除活性远高于两者的单独加和.以上结果均呈现出黄连素显著的抗氧化活性.     

脉红螺（Rapanavenosa）心肌纤维的形态学研究

作者从１９９０年３月至１９９３年６月，通过光镜和电镜，观察了脉红螺心肌纤维的形态结构，并与其它软体动物和脊椎动物进行了比较。脉红螺心肌纤维细长，无肌节和周期性横纹，排列不规则，纵横交错，在两条心肌纤维连接处有类似闰盘的结构。肌原纤维由粗丝和细丝构成，两者平行相间排列，对位不整齐．线粒体发达，成簇分布在肌膜下或肌原纤维间，其间有脂褐素颗粒存在，肌质网不甚发达，成泡状结构，分布在肌膜下．大量糖元颗粒存在于线粒体周围或肌原纤维之间。脉红螺心肌纤维的肌微丝直径处于河蚌和金乌贼的之间。     

Vestibular evidence for the evolution of aquatic behaviour in early cetaceans

Early cetaceans evolved from terrestrial quadrupeds to obligate swimmers, a change that is traditionally studied by functional analysis of the postcranial skeleton. Here we assess the evolution of cetacean locomotor behaviour from an independent perspective by looking at the semicircular canal system, one of the main sense organs involved in neural control of locomotion. Extant cetaceans are found to be unique in that their canal arc size, corrected for body mass, is approximately three times smaller than in other mammals. This reduces the sensitivity of the canal system, most plausibly to match the fast body rotations that characterize cetacean behaviour. Eocene fossils show that the new sensory regime, incompatible with terrestrial competence, developed quickly and early in cetacean evolution, as soon as the taxa are associated with marine environments. Dedicated agile swimming of cetaceans thus appeared to have originated as a rapid and fundamental shift in locomotion rather than as the gradual transition suggested by postcranial evidence. We hypothesize that the unparalleled modification of the semicircular canal system represented a key 'point of no return' event in early cetacean evolution, leading to full independence from life on land.     

AM1 andab initio studies on the internal reorganization energy of self-exchange electron transfer reactions of several quinone derivatives

The semiempirical AM1 method, ab initio (HF/3-21G, 6-31G, 6-31G(d), 6-31+G(d)) and DFT (B3LYP/6-31G(d), 6-31+G(d)) methods were used to optimize the geometry of DDQ and its anion radical . Nelsen’s model was used to calculate the internal reorganization energy ?i of self-exchange electron transfer (ET) reactions. The calculated l _i results of by AM1 and B3LYP/ 6-31G(d), 6-31+G(d) methods are close to each other and consistent with the reported values; while those from Hartree-Fock methods are too large because of not considering the effect of electron correlation. The structure and ET behavior of couple were studied by AM1 and DFT (B3LYP/6-31G(d), 6-31+ G(d, p)) methods, and those of (n = 1—7) were studied by AM1 method for the first time. The results indicate that the values of the heat of formation of MQ_n increases with the increasing of the length of the isoamylene substituent chains. It also shows that the length of substituent has little effect on the bond lengths, bond angles of ring A, ring B and the dihedral angles of ring B, but it has considerable effect on the dihedral angles between the plane of ring A and oxygen atoms. The calculated l _i results of and (n = 1—7) indicate that not only the changes of high frequency vibrations, corresponding to the changes of bond lengths and bond angles, contribute to l _i of (n = 1—7), but also do those of the low frequency vibrations, corresponding to the changes of dihedral angles of MQ_n and . The contribution from the change of low frequency vibrations between the plane of ring A and oxygen atoms to the l _i values of (n = 1—7) is greater than 1.60 kJ/mol; in addition, the contribution from the changes of the low frequency vibrations of the isoamylene substituent to the l _i values of and is about 2 kJ/mol.     

物体的p分位形态分析

作为文献[1,2,3]的继续与发展,本文考察物体的ρ分位形态分析方法:构造形态函数、提取形态参量(整体参量与方向参量)。这对于图象分析,计算机视觉都有重要的理论意义和实用价值。     

基于阈值分割的数学形态学道路标识线检测

针对边缘检测算子对噪声敏感的缺点，提出了一种新的基于阈值分割的形态学道路标识线的检测方法．仿真结果表明，这种方法保留了更多的图像细节，具有更强的去除噪声能力，可以有效地从道路图像中检测道路标识线。     

几个模糊控制器的控制性能

由模糊蕴涵算子构造了一个模糊控制器.首先计算出采用该模糊控制器控制直流串联电机的运行,当电机处于稳定状态时的均方根差;然后与一些文献中给出的具有较好控制品质的模糊控制器加以比较.结果表明,采用本文所构造的模糊控制器控制直流串联电机的运行,其控制效果会更好.     

玉林话词法特征

玉林话词法,有不同于普通话的构词形式：“中心语＋定语”;小称形式有小称变调,也有小称变音;名词词缀以及动词、形容词重叠式,与普通话相比有同也有异。