New Record of Palaeoscolecids from the Early Cambrian of Yunnan, China   总被引：1，自引：0，他引：1  

HU Shixue  LI Yong  LUO Huilin  FU Xiaoping  YOU Ting  PANG Jiyuan  LIU Qi  Michael Steiner 《《地质学报》英文版》2008,82(2):244-248

A new palaeoscolecid, Guanduscolex minor Hu, Luo et Fu gen. et sp. nov., with preserved soft parts of introvert and intestines comes from the Lower Cambrian Guanshan fauna of Yunnan, South China. Microstructural details of the cuticle revealed by scanning electron microscopy （SEM） show that each annulation bears three rows of plates and each plate bears 9-10 marginal and 4-5 central nodes. This discovery sheds new light on the relationships and evolutionary pathway of the palaeoscolecids and other early priapulids.  相似文献   

镉离子对鲫鱼肾细胞超微结构的影响   总被引：2，自引：0，他引：2  

凌善锋  华跃进 《海洋湖沼通报》2005,(1):37-42

应用透射电镜的方法，研究了镉的三种浓度对鲫鱼肾细胞超微结构的影响。结果表明：镉离子染毒4天后，肾细胞超微结构即出现变化，且随着处理浓度的升高，变化渐趋明显，主要表现在细胞核和线粒体。细胞核核膜肿胀、弥散、最后解体。线粒体双层膜解体，形成空白区，嵴断裂、膨大和扭曲。此外，内质网膨胀、空泡化、扭曲打转，溶酶体数量和类型随镉处理浓度的升高而增多。  相似文献   

栉孔扇贝(Chlamys (Azumapecten) farreri) 消化盲囊的组织学和组织化学的研究     

绳秀珍  刘晓云  任素莲  刘竹伞  俞开康 《中国海洋大学学报(自然科学版)》2001,31(3):361-367

运用石蜡切片法、透射电镜技术及组织化学方法，对栉孔扇贝的消化盲囊进行了研究。结果表明消化盲囊的腺上皮由消化(吸收)细胞和分泌细胞组成，消化(吸收)细胞顶端有微绒毛，细胞内有酸性磷酸酶、碱性磷酸酶、脂酶和酯酶活性，还含有糖原和脂肪。是进行食物的细胞内消化和营养物质吸收的主要场所，并有储存能量的功能；分泌细胞内含粗面内质网、高尔基体和分泌颗粒，具有酸性磷酸酶和碱性磷酸酶活性。并含有丰富的RNA和蛋白质，有分泌消化酶的功能；消化盲囊导管上皮细胞顶端有纤毛和微绒毛，细胞内有酸性磷酸酶、碱性磷酸酶及脂酶活性，也能分泌消化酶。消化(吸收)细胞浅部的细胞质及其释放到盲囊腔中的胞质团中含铁；各部位不含钙。  相似文献   

牙鲆嗅上皮超微结构研究   总被引：4，自引：0，他引：4  

王艺磊  郑微云  张子平 《热带海洋学报》1995,(1)

扫描电镜和透射电镜研究显示：牙鲆Ｐａｒａｌｉｃｈｔｈｙｓｏｌｉｖａｃｅｕｓ嗅上皮的边缘为非感觉区，内侧为连续的感觉区，属嗅觉鱼类。非感觉区由表皮细胞、粘液细胞及基底细胞等组成，表皮细胞在游离面相互连接形成似指纹状的嵴的结构。感觉区由纤毛感觉细胞、微绒毛感觉细胞、纤毛非感觉细胞、支持细胞及基底细胞等组成。  相似文献   

栉孔扇贝(Chlamys farreri)晶杆的形态结构和组织化学研究   总被引：1，自引：0，他引：1  

绳秀珍  任素莲  王德秀  杨立民 《海洋学报》2002,24(1):96-100

利用石蜡切片法、扫描和透射电镜技术及组织化学方法,对栉孔扇贝的晶杆进行了研究.晶杆分头部和杆部,横切面呈同轴圆环状,无细胞结构,头部边缘呈溶化状态,内含大量的吞噬细胞和嗜曙红颗粒,杆部表面有球状分泌颗粒.晶杆的电子密度较低,偶尔有带状高电子密度区、电子致密颗粒和电子透明小泡.晶杆内含粘蛋白、酸性粘多糖和蛋白质,无酸性磷酸酶、碱性磷酸酶、脂酶及酯酶活性.栉孔扇贝的晶杆无贮存食物的功能,大小与贝体的性别无关,长时间暴露的在空气中,晶杆消失  相似文献   

罗氏沼虾初级卵母细胞在卵黄形成期超微结构的变化   总被引：2，自引：0，他引：2  

姜乃澄  卢建平  袁保京 《海洋学研究》2001,19(1):35-43

对罗氏沼虾初级卵母细胞在卵黄形成期的超微结构变化进行了研究。卵黄形成期早期 ,初级卵母细胞体积和细胞核迅速增大 ,核内核糖体等物质通过核孔复合体活跃地向胞质转移 ,同时滤泡细胞中的营养物质开始进入初级卵母细胞。初级卵母细胞内卵黄形成的主要细胞器是线粒体、高尔基体、粗面内质网和核糖体 ,其合成过程始于卵黄形成期中期 ,并一直延续至后期。在卵黄形成期中期 ,发现滤泡细胞内的线粒体也有类似的卵黄物质合成功能。同时滤泡细胞继续有物质通过指状通道进入初级卵母细胞 ,直接或间接转化为卵黄物质。卵黄形成期后期 ,初级卵母细胞核膜逐渐消失 ,随着卵黄粒在初级卵母细胞中大量沉积 ,滤泡细胞内的营养物质向初级卵母细胞的转移通道变细 ,转移过程也最后停止  相似文献   

The effects of enriched CO₂ and enhanced UV-B radiation on ultra-structure of Dunaliella salina, singly and in combination     

YU Juan  XIAO Hui  TIAN Jiyuan  ZHANG Peiyu  DONG Shuanglin  TANG Xuexi 《海洋学报(英文版)》2006,25(1):137-146

The effects of ambient CO2/ambient UV-B, enriched CO2/ambient UV-B, ambient CO2/enhanced UV-B, and enriched CO2/enhanced UV-B on the ultrastructure of Dunaliella salina were investigated. （1） The ultrastructure of D..salina cell in the control experiment showed that the arrangement of thylakoid lamellae was regular, and there were many large starch grains among the thylakoid lamellae. A prominent well-developed pyrenoid was found in the middle of the chloroplast. Nucleus envelope and nucleolus were clearly observed. The Golgi apparatus accompanied by numerous vesicles with a compact arrangement of cisternae and the peripheral tips of the cisternae were swollen to a size comparable to that of some of the associated vesicles. （2） The ultrastructure of D. salina cell in enriched CO2 showed that the arrangement of thylakoid was regular and the lamellae were vivid. Developed pyrenoids were found in the low-CO2-grown cells, but not in the high-CO2-grown cells. The mitochondria cristae were vivid. The arrangement of Golgi apparatus was compact. （3） The ultrastructure of D. salina cell in enhanced UV-B showed that the thylakoid was dissolved and the cells had a less developed pyrenoid or no detectable pyrenoid. Part of the nucleus envelope was dissolved. The number ofmitochondria was increased and some mitochondria cristae were disintegrated. The starch grains were broken apart into many small starch grains. The Golgi apparatus with a loose arrangement ofcistemae and the peripheral tips of the Golgi cistemae were not especially swollen, with several large associated vesicles. （4） The ultrastructure of D. salina cell in the enriched CO2/enhanced UV-B showed that part of the thylakoid and nucleus envelopes of some cells were dissolved. The pyrenoid was larger than that of the enhanced UV-B. There were many mitochondria between stroma and chloroplast membrane, but mitochondria cristae were partly dissolved. Many small starch grains were accumulated in cells. The starch sheath was broken into several discontinuous starch grains with different sizes. The arrangement of Golgi apparatus was loose. Above all, although the enriched CO2 can alleviate the damage induced by the UV-B radiation, the effects of experimental UV-B radiation were larger than the effects of actual UV-B radiation, the damage induced by the UV-B radiation was so severe, therefore, CO2 enrichment could not restore the ultrastructure to the control level.  相似文献   

泥螺肝胰腺细胞的超微结构和功能     

应雪萍 《海洋科学》2007,31(10):41-46

利用透射电镜技术研究了泥螺(Bullactaexarata)肝胰腺细胞的超微结构。结果表明,泥螺的肝胰腺主要由4类细胞构成:泡状细胞(B细胞)、吸收细胞(R细胞)、纤维细胞(F细胞)和胚细胞(E细胞)。B细胞大,长柱状,胞质中有许多消化泡;R细胞的脂滴数量多,体积大,具少量的线粒体;F细胞含有极丰富的粗面内质网、线粒体等结构,但脂滴的数量远远少于R细胞。E细胞为多边形,核大而圆,粗面内质网少,线粒体小而狭长。根据这4种细胞的超微结构特点,指出了泥螺肝胰腺的功能,并探讨了肝胰腺细胞的分化序列。  相似文献   

缢蛏Sinonouacula constricta卵子发生的超微结构分析   总被引：4，自引：0，他引：4  

上官步敏  刘正琮 《台湾海峡》1992,11(2):174-179

  相似文献   

超低温保存前后太平洋牡蛎精子(Crassostrea gigas (Thunberg))超微结构观察   总被引：1，自引：0，他引：1  

李赟  贺桂珍  王品虹 《中国海洋大学学报(自然科学版)》2002,32(4):526-532

应用扫描电镜和透射电镜技术 ,研究超低温冷冻前后太平洋牡蛎精子形态与超微结构。结果发现 ,受伤精子被膜肿胀、皱褶、破裂 ;顶体变形、囊泡化 ,顶体膜肿胀、局部断裂 ;核膜肿胀、破裂 ,核空泡化 ;线粒体嵴变形、消失 ,基质电子密度降低 ,结构模糊 ;精子鞭毛被膜膨胀 ,鞭毛自精子基部或主、末段断裂。结果表明 ,超低温冷冻和升温解冻 ,对牡蛎精子的膜结构损伤严重 ,导致精子活力和受精能力下降  相似文献