红鳍东方鲀精子形态的研究   总被引：2，自引：0，他引：2  

张筱兰  姜明  姚斐  丛娇日  郭恩棉  高澜  范瑞青  姚善成 《中国海洋大学学报(自然科学版)》1999,(2)

实验研究红鳍东方精子形态的超微结构：红鳍东方精子分头部和尾部等两部分。头部似炮弹状,无顶体;核内有空隙,空隙中有或无少量电子致密小颗粒;细胞膜与核膜间的原生质有向外鼓起的单个小液泡;中心粒复合体位于植入窝内,由近端中心粒、中心粒间体和基体等组成。袖套位于核后端,内含７～８个环列的线粒体球。尾部近核端部分鞭毛的一侧有小囊泡群聚的囊泡鞘;远核端部分有侧鳍;囊泡鞘和侧鳍与轴丝的中央微管同在“Ｙ”轴上;轴丝为“９＋２”结构。  相似文献   

半滑舌鳎精子的超微结构   总被引：5，自引：0，他引：5  

吴莹莹  柳学周  王清印  徐永江  包振民 《海洋学报》2007,29(6):167-171

硬骨鱼类精子的超微结构,国内外已有较为广泛的研究,一般均为鞭毛型精子,由头部、中片和尾部三部分组成.但不同种硬骨鱼的精子,其细胞核、中心粒复合体、袖套和鞭毛等的结构和形态都各有特异之处.  相似文献   

近缘新对虾成熟精子的超微结构   总被引：3，自引：0，他引：3  

林瑞才  张金标 《台湾海峡》1991,10(3):195-198,T001

近缘新对虾的成熟精子属于无鞭毛型,其超微结构可分为主体部、帽状部和刺突。主体部由残留的细胞质带和泡状的细胞核组成,中央凹陷处的核前细胞质不明显,无颗粒物存在。帽状部的边围层形成膜状物,且内壁有许多膜状突起。刺突为一刺状突起,外围包裹似二层膜结构,刺突横切表明无中心粒结构。  相似文献   

广西北海营盘海域钝缀锦蛤(Tapes conspersus)卵巢发育、卵子和卵黄发生的研究     

连昌朋  吴韬  王超奇  杨凌  潘英 《热带海洋学报》2022,41(5):170-179

文章采用组织切片、透射电镜技术对广西北海营盘海域钝缀锦蛤(Tapes conspersus)的卵巢发育、卵子发生的组织学及卵黄发生的超微结构进行研究。结果显示,钝缀锦蛤卵巢发育一年为一个繁殖周期,分为增殖期(6月底—7月)、生长期(7月中旬—10月中旬)、成熟期(11月—翌年2月底)、排放期(3月—4月)、休止期(5月—6月)共5个时期。钝缀锦蛤卵巢发育受水温的影响较大,个体间的性腺发育并不完全同步。在广西北海营盘海域,钝缀锦蛤每年在6月底—7月初性腺开始发育,在翌年3月—4月底成熟的卵子大量排放。依据钝缀锦蛤卵细胞发育的相关特点,可将其划分为4个主要阶段,第一阶段为卵原细胞期,第二阶段为初级卵母细胞期,第三阶段为次级卵母细胞期,第四阶段为成熟卵母细胞期。根据透射电镜观察钝缀锦蛤卵黄的发生,可将其分为3个主要时期,第一时期为卵黄合成前期,第二时期为卵黄合成期,第三时期为卵黄合成后期。  相似文献   

Eco-physiological mechanisms of Caragana korshinskii Kom. adaptation to extreme drought stress: Leaf abscission and maintaining stem chloroplast integrity     

DangHui Xu  XiangWen Fang  ZhenJun Bin  Gang Wang  PeiXi Su 《寒旱区科学》2012,4(6):0498-0504

In order to study the eco-physiological mechanisms of C. korshinskii adaptation to extreme drought stress, we investigated the variations of water content in soil, leaves, and stems, the chlorophyll a and b and the carotenoid content in leaves and stems, as well as changes of chloroplast ultrastructure in 2-year-old C. korshinskii specimens during a progressive soil drought process (by ceasing watering until all leaves were shed) and a subsequent rehydration process. During the dehydration process, the chlorophyll a and b and carotenoid contents in the leaves decreased, as did the carotenoid content in the stems. During the 4-day rehydration process, the chlorophyll a and b and carotenoid contents in the leaves and stems increased and gradually returned to normal levels. During ongoing drought stress, chloroplasts in the leaves broke away from cell walls and appeared in the center of cells. Under severe drought stress, the mesophyll ultrastructure and chloroplast configuration in leaves were irreversibly disturbed, as manifested by the inner and outer membranes being destroyed; the thylakoid system disintegrated, the starch grain disappeared, and parts of cell tissue were dismantled into debris. However, the mesophyll ultrastructure and chloroplast configuration in the stems remained complete. This indicates that C. korshinskii utilizes leaf abscission to reduce the surface area to avoid damage from extreme drought stress, and maintains chloroplast integrity and a considerable amount of chlorophyll to enable a rapid recovery of photosynthesis under the rehydration process.  相似文献   

丁青和新喀里多尼亚玻安岩类的辉石及其超微结构     

黄婉康  王岩国  张旗  王明再  T.Sameshima 《矿物学报》1993,(2)

本文对西藏丁青玻安岩类深成岩的辉石和新喀里多尼亚玻安岩的斜顽辉石进行了矿物学工作及高分辨电镜观察。丁青斜方辉石堆晶岩辉石的超微结构包括:单斜辉石的(100)双晶、斜方辉石a/4平移畴结构及斜方辉石—单斜辉石相转变。玻安岩斜顽辉石典型超微结构是(100)双晶。由矿物的碎裂、错动以及斜方辉石—单斜辉石相变中只出现偶数倍单斜辉石等表明:矿物结晶及成岩过程中曾受应力作用、后者可能与岩石所处的构造位置有关。由辉石成分计算的地质温度表明,丁青堆晶斜方辉石岩的辉石是在高温下晶出、岩石固结温度是1013～1111℃,当它们在～1000℃下稳定时,斜方辉石出溶了单斜辉石片晶。将玻安岩斜顽辉石加热至1100℃后淬冷及按120℃/h速度冷却均未得到纯的斜顽辉石,可能斜顽辉石是原顽火辉石在应力环境中高温淬冷所成。  相似文献   

The Ultrastructure and Origin of Upper Sinian Cherts on the Southeast Continental Margin of the Yangtze Platform1     

Yi Haisheng  Zeng Yunfu  Xia Wenjie 《《地质学报》英文版》1994,7(4):389-400

Abstract Through microscopic and SEM observations and X-ray diffraction and energy spectrum analyses, the oldest sponge spicules and radiolarians have been found in bedded cherts and it is proposed that microbial activity of algae and bacteria played an important role in silica precipitation. The microbial activity resulted in the formation of a series of single crystals and crystal aggregates with peculiar shapes. Biogenic single crystals usually occur in spherical, rod, platy, colloidal and granular forms. The most common aggregates are framboidal aggregates composed of dense spherical quartz crystals, which are considered to be of typical bacterial origin. Other aggregates, such as favositic, double-spherical, chain -spherical and coccoid ones, are considered to be probably the result of silicification of algal cells and mainly of primary sedimentary origin. This paper also discusses the ultrastructural features and diagnostic indications of jasper rocks formed in a submarine hydrothermal environment and cherts formed by replacement and diagenetic recrystallisation.  相似文献   

The infrastructure and Origin of Upper Sinian Cherts on the Southeast Continental Margin of the Yangtze Platform     

Yi Haisheng  Zeng Yunfu  Xia WenjieChengdu C allege of Geology  Chengdu  Sichuan Fei Zhenbi 《《地质学报》英文版》1994,68(4)

Through microscopic and SEM observations and X-ray diffraction and energy spectrum analyses, the oldest sponge spicules and radiolarians have been found in bedded cherts and it is proposed that microbial activity of algae and bacteria played an important role in silica precipitation. The microbial activity resulted in the formation of a series of single crystals and crystal aggregates with peculiar shapes. Biogenic single crystals usually occur in spherical, rod, platy, colloidal and granular forms. The most common aggregates are framboidal aggregates composed of dense spherical quartz crystals, which are considered to be of typical bacterial origin. Other aggregates, such as favositic, double-spherical, chain-spherica'l and coccoid ones, are considered to be probably the result of silicification of algal cells and mainly of primary sedimentary origin. This paper also discusses the ultrastructural features and diagnostic indications of jasper rocks formed in a submarine hydrothermal environment and cher  相似文献   

FURTHER OBSERVATION OF THE SPERMATOZOA OF LEFT-EYE FLOUNDER PARALICHTHYS OLIVACEUS BY ELECTRONIC MICROSCOPY     

田宏田张培军  谢嘉琳姜明 《中国海洋湖沼学报》2002,20(2):170-173

The spermatozoon ultrastrucmre of left-eye flounder, Paralichthys olivaceus, was ob-served by electronic microscopy, and shown to consist of head, midpiece and tail. Some nuclear vacuoles were observed inside and along the outer part of the nucleus and double-membrane structures were ob-served between the nuclear membrane and plasma membrane. The sperm sleeve consisted of four indepen-dent parts and had more than four mitochondria. Along the sperm tail there were wing-like lateral tins.  相似文献   

The Gastric Shield and the Underlying Epithelium of Chlamys Farreri:Morphological, Histological and Histochemical Characterizations     

绳秀珍  战文斌  史平  任素莲 《中国海洋湖沼学报》2003,21(1)

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