385名大学生白发情况调查现状及白发原因分析

为了解大学生白发现状以及相关的影响因素，动态分析白发现象的原因.通过体查、问卷调查.结果发现385名大学生中有白发者182名，占47.27%.随着年龄的增加，其白发发生率逐年上升.与白发相关的影响因素中，情绪紧张的占34.60%，挑食与偏食的占76.92%，其父母在45岁之前有白发的占70.3%，生活环境受到污染的占67.6%.说明父母遗传、不良饮食习惯、紧张的情绪、环境污染等是青少年头发早变白的主要原因.     

废牦牛毛制取胱氨酸和复合氨基酸的研究

研究了用废牦牛毛为原料提取重要医药原料胱氨酸，用制备胱氨酸后的母液生产新型饲料添加剂——复合氨基酸螯合物．     

Two new species of Bonnetina tarantulas (Theraphosidae: Theraphosinae) from Mexico: contributions to morphological nomenclature and molecular characterization of types

Two new species of tarantulas from Mexico are described and illustrated: Bonnetina tenuiverpis and Bonnetina juxtantricola, from the states of Mexico and Guerrero, respectively. Male palpal bulbs, tibial apophyses and spermatheca are among the most taxonomically informative characters. Male bulb microstructure is revealed from scanning electron microscopy; both new and homologous structures to other Theraphosinae genera are identified and described. Nomenclatural changes for male tibial apophyses are also proposed. The holotype male and allotype female of one of the species are molecularly characterized and matched from CO1 partial sequence.

http://zoobank.org/urn:lsid:zoobank.org:pub:BBDBBEDE-6983-4F5C-B34C-4622DF494C84     

东京野茉莉雌雄蕊的形态及显微结构

【目的】了解东京野茉莉(Styrax tonkinensis)花部及雌雄蕊的形态及内部显微结构,探寻其花粉败育原因。【方法】运用光镜和电镜技术,对其雌雄蕊内外部形态特征、显微结构和超显微结构进行观察研究。【结果】①每朵两性花中有雄蕊10枚,由花丝和花药组成。花丝宽(0.38±0.12)mm,长(8.24±0.72)mm,成熟花药由2个狭长圆形的药室组成。成熟花粉在扫描电镜下可见3或4个萌发沟,外壁有细网状纹饰,还发现有形态皱缩发育不良的花粉。透射电镜显示发育良好的花粉壁有2层,细胞内质浓厚,含有高尔基体、较多的线粒体、高电子致密物质和淀粉粒等结构。② 雌蕊1枚,由柱头、花柱和子房组成。柱头上有“Y”形裂沟和椭球状乳突,传粉后,柱头上有分泌物。花柱中空。子房3室,多枚倒生胚珠; 发育后期,只有1～2个发育为种子,其余退化。【结论】东京野茉莉花部特征符合安息香科特征,花粉粒3种形态; 柱头湿型,胚珠倒生; 可育花粉粒和珠被细胞内细胞质浓,细胞器较多。     

棉／维纶混纺纱及其针织产品性能分析

对棉/维纶混纺纱线及其针织物进行了退维工艺处理,从而获得相应纱线及其针织物.并对处理前后纱线的断裂强力、失重率、毛羽以及织物的压缩性能、保暖性和吸湿快干性进行了测试分析,得出该纱线具有良好的机械与服用性能.     

The larval development of Argulus coregoni Thorell (Crustacea: Branchiura)

Summary

The larval development of Argulus coregoni from the first to the ninth stage was studied, with special reference to the morphological changes of the appendages and some other parts of the body.

A newly hatched larva is a copepodid-form measuring 0·6–0·7 mm long and approaches the shape of the adult after moulting into the second stage (0·7–0·9 mm). Throughout the larval stages, the first maxilla shows the most remarkable modification. The larvae of the first to the fifth stage are equipped with two strong, curved claws, which act as a clasping organ, at the terminal segment of the first maxilla. The basal segment expands considerably at the third stage (0·9–1·1 mm) prior to forming a sucker at the sixth stage (1·7–2·2 mm). The claws start to degenerate at the fifth stage (1·4–1·8 mm), but are still recognizable as a rudiment after the seventh stage (2·2–2·6 mm). The other distinct morphological changes that occurred are: (1) bifurcation of the anterior part of the dorsal ridges on the carapace, (2) development of the male accessory copulatory organ at the basal segments of the second to the fourth legs, (3) number of posteriorly directed minute spines on the ventral surface of the carapace, (4) number of elements in the supporting ribs of the suckers, (5) number of spines found at the first segment of the second maxilla, and (6) number of setae on the four pairs of thoracic legs.

The larval forms of A. coregoni younger than the fourth stage (1·1–1·4 mm) are indistinguishable from those of A. japonicus and A. foliaceus.     

多裂叶荆芥盾状腺毛的形态结构和发育的研究

多裂叶荆芥（Schizonepeta mulifida(L.)Briq.)叶上盾状腺毛的研究表明：盾状腺毛是由腺毛原始细胞经过二次平周分裂和分泌细胞的原始细胞经过4次垂周分裂形成。其结构模式为1个基细胞，1个扁平的柄细胞和由12（13）个分泌细胞构成的头部，其头部分泌细胞明显呈两环排列。     

烟草叶片腺毛的研究

对烟草K326再生植株叶片腺毛的密度、发生及形态结构的研究表明，烟草幼叶腺毛密度较大，随叶片的发育而逐渐降低，烟草腺毛分为长柄腺毛与短柄腺毛两种类型，都由原始表皮细胞经过不同的分裂形式而最终发育成为腺毛，腺毛分泌细胞中有多糖类物质存在。     

Stamen specification and anther development in rice

Male reproductive development is a complex biological process which includes the formation of the stamen with differentiated anther tissues, in which microspores/pollens are generated, then anther dehiscence and subsequently pollination. Stamen specification and anther development involve a number of extraordinary events such as meristem transition, cell division and differentiation, cell to cell communication, etc., which need the cooperative interaction of sporophytic and gametophytic genes. The advent of various tools for rice functional gene identification, such as complete genome sequence, genome-wide microarrays, collections of mutants, has greatly facilitated our understanding of mechanisms of rice stamen specification and anther development. Male sterile lines are critical for hybrid rice breeding, therefore understanding these processes will not only contribute greatly to the basic knowledge of crop developmental biology, but also to the development of new varieties for hybrid rice breeding in the future.