中国喇叭螺属一新种(肺螺亚纲,柄眼目,虹蛹螺科)

记述采自贵州省陆生贝类1新种,修文贝喇叭螺Boysidia(Bensonella)xiuwenensis sp.nov.,文中对新种形态特征、栖息环境进行了描述,并对其相似种进行了分析和讨论。     

中国喇叭螺属的动物地理分析及一新种记述(肺螺亚纲:柄眼目:虹蛹螺科)

分析了中国喇叭螺属Boysidia (Ancey ,1881)种类地理分布 ,以东洋界的成分为主 ,最北已分布至北纬 34°5′。文中报道 1新种 ,即潼关贝喇叭螺Boysidia (Bensonella)tongguanensissp .nov .。     

中国云南喇叭螺属一新种(肺螺亚纲,柄眼目,虹蛹螺科)

详细记述了喇叭螺属Boysidia一新种,金平喇叭螺新种Boysidia(Bensonella)jinpingensis sp.nov.。对新种的形态进行了详细描述,并与其近似种进行了对比和讨论。模式标本保存于昆明医科大学细胞生物学与医学遗传学系标本室。     

中国喇叭螺属的研究及一新种记述

笔者整理和厘清了Boysidia Ancey,1881已记载的中国喇叭螺属的种类,共计24种,其中有1新种,即清凉峰贝喇叭螺新种Boysidia(Bensonella)qingliangfengensis sp.nov.,对喇叭螺各亚属、贝喇叭螺亚属的已知种列出检索表,并对新种的形态特征、栖息环境进行了记述,与相似种进行了讨论。新种模式标本分别保存在中国科学院动物研究所标本馆和昆明医科大学细胞生物学与医学遗传学系标本室。     

喇叭螺属一新种(肺螺亚纲,柄眼目,虹蛹螺科)

在贵州省喀斯特地貌区陆生贝类多样性调查采得的标本中,经鉴定得喇叭螺属1新种,即兴义贝喇叭螺Boysidia(Bansonella)xingyiensis sp.nov..对新种的形态进行了详细描述,与其近似种进行了对比.正、副模标本均保存于中国科学院动物研究所标本馆.     

中国喇叭螺属一新种记述(肺螺亚纲,柄眼目,虹蛹螺科)

记述采自贵州省陆生贝类1新种,巩尧山喇叭螺Boysidia(Boysidia)gongyaoshanensis sp.nov.,文中对新种形态特征、栖息环境进行了描述,并对其相似种进行了分析和讨论。     

中国喇叭螺属的研究及六新种记述(肺螺亚纲:柄眼目:虹蛹螺科)

作者整理和记忆了中国科学院动物研究所历年来所保存的中国喇叭螺属的标本,共计有１４种,其中有６新种,即五齿喇叭螺,凤悬喇叭螺,,西山喇叭螺,太白喇叭螺,双片贝喇叭螺,石林贝喇叭螺,文中对中国喇叭螺属的种类进行了整理和鉴别,并对６新种的形态特态,栖息环境进行了记述,对相似种进行了讨论。     

中国虹蛹螺科二新种(肺螺亚纲:柄眼目:虹蛹螺科)

作者 作者晨贵州省镇宁布依赖苏州自治县境内采得陆生贝类标本一批,经鉴定得喇叭螺属２种,即：天星桥喇叭螺,新种Ｂｏｙｓｉｄｉａ （Ｂａｎｓｏｎｅｌｌａ）ｔｉａｎｘｉｎｇｑｉａｏｅｎｓｉｓ,Ｌｕｏ,Ｃｈｅｎ ｅｔ Ｚｈａｎｇ ｓｐ．ｎｏｖ 果喇叭螺,新种Ｂｏｙｓｉｄｉａ（Ｂｏｙｓｉｄｉａ）ｈｕａｎｇｇｕｏｓｈｕｅｎｓｉｓ Ｌｕｏ,Ｃｈｅｎ ｅｔ Ｚｈａｎｇｅ,ｓｐ．ｎｏｖ。对新种的形态进行了详细描述     

中国陆生贝类二新种（肺螺亚纲：柄眼目：虹蛹螺科）

１９９２年３月至５月,作用在陕西省考察,获得陆生贝类一批,经鉴定发现２新种,即双片喇叭螺Ｂｏｙｓｉｄｉａ ｄｉｌａｍｅｌｌａｒｉｓ ｓｐ．ｎｏｖ．和凤县喇叭螺Ｂｏｙｓｉｄｉａ ｆｅｎｇｘｉａｎｅｎｓｉｓ ｓｐ．ｎｏｖ．,隶于肺螺亚纲、柄眼目、虹蛹螺科、喇叭螺属。文内对２新种形态特征、栖息环境进行地描述,并对其相似种进行了讨论。     

荔枝螺属一新种记述(腹足纲,新腹足目,骨螺科)

笔者在整理浙江沿海荔枝螺属Thais Roeding,1798标本时,经形态分类方法和分子生物学方法鉴定发现1新种,即大渔荔枝螺Thais(Stramonita)dayunensis sp.nov.,隶属于腹足纲、前鳃亚纲、新腹足目、骨螺科、红螺亚科、荔枝螺属、Stramonita亚属.文中对新种的形态特征和栖息环境进行了记述,并与近似种进行了比较讨论.     

江西弯螺属一新种记述(肺螺亚纲,柄眼目,扭轴蜗牛科)

在整理江西地区陆生贝类标本时,经比对鉴定发现1新种,龙潭弯螺Sinoennea longtanensis sp.nov.,隶属肺螺亚纲、柄眼目、扭轴蜗牛科、弯螺属。对新种形态特征、栖息环境作了记述,并与其近似种进行讨论。     

云南管螺属一新种记述(肺螺亚纲,柄眼目,烟管螺科)

记述采自云南省石林县陆生贝类1新种,即石林管螺Phaedusa shilinensis sp.nov.,文中对新种形态特征、栖息环境进行了描述,并对其相似种进行了分析和讨论。     

黄瓜卷须缠绕过程中小G蛋白活性变化

攀爬植物的卷须是对机械刺激极为敏感的器官。拟南芥(Arabidopsis thaliana)小G蛋白能够响应机械刺激调控自身发育, 但小G蛋白信号是否在卷须感受机械刺激发生缠绕过程中发挥作用目前尚不清楚。该研究以黄瓜(Cucumis sativus)为实验材料, 对其卷须受机械刺激缠绕过程中小G蛋白活性进行了探讨。ROP活性检测结果表明, 在卷须缠绕过程中小G蛋白CsROP6的活性显著增强; 同时, 质谱鉴定结果显示, 卷须缠绕过程中生长素的含量明显增加。进一步的实验表明, 外源生长素处理能明显增强CsROP6的活性, 暗示黄瓜卷须在缠绕过程中受机械刺激可能通过生长素增强ROP活性, 且机械刺激激活小G蛋白信号在不同植物中存在一定的保守性。     

Fine Structure of Trichomitus batrachorum (Perty)*

SYNOPSIS. Trichomitus batrachorum (Perty) shares with Trichomonadinae most of its fine-structural characteristics, especially those pertaining to the undulating membrane that consists of a high body fold, enclosing the loop-shaped, periodic marginal lamella, and of the recurrent flagellum applied to the fold. This flagellate has also certain structures, i.e. the costal base, comb-like organelle, and well developed marginal lamella, in common with Monocercomonas. It shares with Hypotrichomonas the costal base; large pelta; very fine fibers perpendicular to, and connecting the axostylar microtubules; structural details of the most proximal segment of the marginal lamella; and general relationships between dorsal body fold (poorly developed in Hypotrichomonas) and the recurrent flagellum. All these electronmicroscopic findings support the crucial position of Trichomitus in the evolutionary sequence Monocercomonas→Hypotrichomonas→Trichomitus→ Trichomonadinae suggested previously by lightmicroscopic observations. Further, Trichomitus shares with all Tritrichomonadinae the comb-like structure, not found either in Hypotrichomonas or Trichomonadinae; and it has in common with Tritrichomonas also the costa with Type A periodicity, being the only member of Trichomonadinae with this type of supporting organelle. It appears, therefore, that Trichomitus-type organisms represent an important link in the evolution of all Trichomonadidae from Monocercomonadidae.     

Modeling of bone at a single lamella level

This paper focuses on the ultrastructure of bone at a single lamella level. At this scale, collagen fibrils reinforced with apatite crystals are aligned preferentially to form a lamella. At the next structural level, such lamella are stacked in different orientations to form either osteons in cortical bone or trabecular pockets in trabecular bone. We use a finite element model, which treats small strain elasticity of a spatially random network of collagen fibrils, and compute anisotropic effective stiffness tensors and deformations of such a single lamella as a function of fibril volume fractions (or porosities), prescribed microgeometries, and fibril geometric and elastic properties.     

Overexpression of cyclin D1 induces the reprogramming of differentiated epidermal cells into stem cell-like cells

It has been reported that Wnt/β-catenin is critical for dedifferentiation of differentiated epidermal cells. Cyclin D1 (CCND1) is a β-catenin target gene. In this study, we provide evidence that overexpression of CCND1 induces reprogramming of epidermal cells into stem cell-like cells. After introducing CCND1 gene into differentiated epidermal cells, we found that the large flat-shaped cells with a small nuclear-cytoplasmic ratio changed into small round-shaped cells with a large nuclear-cytoplasmic ratio. The expressions of CK10, β1-integrin, Oct4 and Nanog in CCND1 induced cells were remarkably higher than those in the control group (P < 0.01). In addition, the induced cells exhibited a high colony-forming ability and a long-term proliferative potential. When the induced cells were implanted into a wound of laboratory animal model, the wound healing was accelerated. These results suggested that overexpression of CCND1 induced the reprogramming of differentiated epidermal cells into stem cell-like cells. This study may also offer a new approach to yield epidermal stem cells for wound repair and regeneration.     

Molecular requirements for actin-based lamella formation in Drosophila S2 cells

Cell migration occurs through the protrusion of the actin-enriched lamella. Here, we investigated the effects of RNAi depletion of approximately 90 proteins implicated in actin function on lamella formation in Drosophila S2 cells. Similar to in vitro reconstitution studies of actin-based Listeria movement, we find that lamellae formation requires a relatively small set of proteins that participate in actin nucleation (Arp2/3 and SCAR), barbed end capping (capping protein), filament depolymerization (cofilin and Aip1), and actin monomer binding (profilin and cyclase-associated protein). Lamellae are initiated by parallel and partially redundant signaling pathways involving Rac GTPases and the adaptor protein Nck, which stimulate SCAR, an Arp2/3 activator. We also show that RNAi of three proteins (kette, Abi, and Sra-1) known to copurify with and inhibit SCAR in vitro leads to SCAR degradation, revealing a novel function of this protein complex in SCAR stability. Our results have identified an essential set of proteins involved in actin dynamics during lamella formation in Drosophila S2 cells.     

Annulate lamellae as a precursor or a product of paired cisternae in human adenomatous parathyroid cells

Clusters of chief cells from a fragment of human parathyroid adenoma possess relatively few rough endoplasmic reticulum (RER) cisternae with scattered annulate lamella (AL) pores in cytoplasmic sectors close to the nucleus. Some of these cisternae exhibit winding profiles with smooth segments lying very close to the outer nuclear membrane. Other groups of cells exhibit well-developed stacks of RER either in continuity with or separated from AL. Two other tumor fragments show chief cells with few RER cisternae scattered in the cytoplasm and possess stacks with various amounts of AL and/or paired cisternae (PC), occasionally at perinuclear sites. Compartmental continuity between AL and PC is a frequent finding. Pore density in AL varies considerably between the stacks from different cells.