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1.
利用透射电子显微镜观察乌苏里拟鲿(Pseudobagrus ussuriensis)精子的超微结构。结果表明,乌苏里拟鲿精子由头部、中段和尾部组成。头部呈球形或椭圆球形,核前端无顶体,后端有植入窝。中段包括中心粒复合体和袖套。植入窝从细胞核的后端陷入核中。中心粒复合体位于植入窝内,包括近端中心粒和远端中心粒。袖套与细胞核后端相连,袖套中含有丰富的线粒体。尾部主要结构是轴丝,为典型的"9+2"结构,轴丝外两侧为细胞质膜形成的对称性鳍样结构。尾部内无囊泡及其他细胞器。 相似文献
2.
Yan Gao Tao Zhang Libin Zhang Tianlong Qiu Dongxiu Xue Hongsheng Yang 《中国海洋大学学报(英文版)》2014,13(6):1071-1077
Spionid worms of Polydora ciliata inhabit the shells of many commercially important bivalves and cause disease in molluscan aquaculture. Their sperm structure is closely related to their fertilization method. To give an insight into the sperm structure and spermatogenesis, ultrastructure details of the subcellular components of germ cells during spermiogenesis of Polydora ciliata are detected by transmission electron microscopy (TEM). In P. ciliata, during spermiogenesis, chromatin is regularly arranged as dense fibrils and becomes more condensed when the nucleus elongates. Microtubules do not surround the nucleus during its elongation. The Golgi phase is characterized by the formation of proacrosomal granules within the Golgi apparatus. The proacrosomal granules fuse to form a single, spherical acrosomal vesicle that migrates to the anterior pole of the cell. At the time of nuclear condensation, mitochondria become reduced in number but increased in size, causing deep indentation at the base of the nucleus. The mid-piece has a few mitochondria. The cap phase includes the spreading of the acrosomal granule over the surface of the nucleus of the differentiating spermatid. The acrosomal phase of spermiogenesis is typically associated with changes in the shape of the nucleus, acrosome and tail. The relationship of sperm ultrastructure to spermiogenesis in spionidae species was discussed. 相似文献
3.
ＩＮＴＲＯＤＵＣＴＩＯＮＢｉｌｌａｒｄ ( 1 986)ｓｔｕｄｉｅｄｔｈｅｓｐｅｒｍａｔｏｚｏｏｎｕｌｔｒａｓｔｒｕｃｔｕｒｅｓｉｎｔｅｌｅｏｓｔｓａｎｄｆｏｕｎｄｄｉｓｔｉｎｃｔｄｉｆｆｅｒｅｎｃｅｓａ ｍｏｎｇｄｉｆｆｅｒｅｎｔｓｐｅｃｉｅｓ.Ｓｔｕｄｙｏｎｓｐｅｒｍａｔｏｚｏｏｎｍｏｒｐｈｏｌｏｇｙａｎｄｆｕｎｃｔｉｏｎｉｓａｃｈａｌｌｅｎｇｅｂｅｃａｕｓｅｏｆｔｈｅｓｐｅｒｍ’ｓｓｐｅｃｉａｌｅｎｖｉｒｏｎｍｅｎｔ (Ｇａｇｅｅｔａｌ.,1 998;ＷａｎｇａｎｄＺｈａｎｇ,1 999) .Ｓｉｎｃｅｌｅｆｔ ｅｙ… 相似文献
4.
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
5.
3种珍珠贝精子发生及其超微结构的比较研究 总被引：1，自引：0，他引：1
杜晓东 《广东海洋大学学报》1996,(2)
在透射电子显微镜下观察合浦珠母贝（Ｐｉｎｃｔａｄａｆｕｃａｔａ）、大珠母贝（Ｐｉｎｃｔａｄａｍａｘｉｍａ）和企鹅珍珠贝（Ｐｔｅｒｉａｐｅｎｇｕｉｎ）的精子发生及精子形态．结果表明．大珠母贝从精原细胞到精子，核内都有数量不等的板层小体（ｎｕｃｌｅａｒｌａｍｅｌｌａｒｂｏｄｙ）；企鹦珍珠贝从精原细胞的晚期直到精子细胞早期，大多数细胞出现核内包含体（ｎｕｃｌｅａｒｉｎｃｌｕｓｉｏｎ）；而合浦珠母贝的生精细胞核无特殊结构．合浦珠母贝在初级精母细胞时由高尔基体分泌形成前顶体粒；企鹅珍珠贝的前顶体粒主要在次级精母细胞和早期精子细胞阶段形成。虽然大珠母贝的各级生精细胞中都没有出现典型的高尔基体，但前顶体粒仍在精母细胞时期形成。三种贝的精子结构均为典型的原生型，由头部、中段和尾部构成．合浦珠母贝精子的顶体最长，中段的线粒体数有变异；大珠母贝的精子核最高，其中含有板层小体；而企鹅珍珠贝精子中段的体积是最大的． 相似文献
6.
在透射电子显微镜及环境扫描电子显微镜下观察黄鳍东方鲀精子的超微结构。结果表明:黄鳍东方鲀精子由头部和尾部两部分组成。头部呈长圆柱形,无顶体,核内有小空隙,空隙中有少量电子致密小颗粒存在;核后端正中有凹陷入核内的植入窝,中心粒复合体位于植入窝内,由近端中心粒、中心粒间体和基体组成;袖套位于核的后端,内含线粒体球和含有电子致密物质的小囊泡。尾部细长,自头部后端的正中部向后伸出,近核端部分很短,核心结构是轴丝,鞭毛起始于袖套腔,远核端有侧鳍;轴丝为典型的"9+2"微管对复合体结构。 相似文献
7.
ZHANG Yanyan REN Sulian WANG Dexiu SONG Weibo 《中国海洋大学学报(英文版)》2006,5(2):132-136
Light and electron microscopic studies were carried out in order to characterize haemocytes in the bivalve mollusc Meretrix meretrix. According to nucleus and cytoplasm characters, four types of haemocytes were recognized： agranular haemocytes, lymphoid haemocyte, large granular and small granular haemocytes. Agranular hamocyte is the main cell type, accounting for 75%. It is agranular with rich organelles in cytoplasm, including mitochondria, golgi body and endoplasmic reticulum. Glycogen deposits were usually found in this cell type. The number of lymphoid haemocyte accounts for 1% - 2%. This cell type is agranular and shows a high ratio of nucleus to cytoplasm. A few organelles were found. High electrondense granules with diameters of 0.2 - 0.5μm and rich organelles were found in small granular haemocyte. The proportion of this cell type is about 15%. Rich granules of high electron-dense with diameters of 0.8- 2.4μm were found in large granular haemocyte. The proportion of this cell type is about 10%, and the quantity of organelles is the least. 相似文献
8.
Ｂｉｖａｌｖｅｓｈａｖｅｔｒａｎｓｌｕｃｅｎｔｔｈｉｎｍｅｍｂｒａｎｅｓ—ｔｈｅｇａｓｔｒｉｃｓｈｉｅｌｄｃｏｖｅｒｓｏｎｔｈｅｌｅｆｔｏｆｔｈｅｐｏｓｔｅｒｉｏｒｓｔｏｍａｃｈｗａｌｌｓ;ｔｈｅｈｅａｄｏｆｔｈｅｃｒｙｓｔａｌｌｉｎｅｓｔｙｌｅｈｏｕｓｅｄｉｎｔｈｅｓｔｙｌｅ ｓａｃｉｓｒｏｔａｔｅｄｆｏｒｗａｒｄｉｎｔｏｔｈｅｓｔｏｍａｃｈｔｏｉｍｐｉｎｇｅｔｈｅｆｏｏｄｏｎｔｈｅｇａｓｔｒｉｃｓｈｉｅｌｄ (ＺｈａｎｇａｎｄＴａｉ,1 961 ) .Ｉｔｗａｓｒｅｐｏｒｔｅｄｔｈａｔｔｈｅｇａｓｔｒｉｃ… 相似文献
9.
Transmission electron microscopy of the yellowfin porgy (Sparus latus Houttuyn) spermatozoa ultrastructure showed the spermatozoon as a primitive type made up of the acrosomeless head, the flagellum,
and the midpiece, at the periphery of which was a relatively big mitochondrion with more complex structure. It was found that
during spermiogenesis, only one relatively big mitochondrion occurred in both the spermatid and the spermatozoon. This is
different from other teleost fishes. During spemiogenesis, the mitochondria number is one, and morphology did not change.
All these are different from those of other fishes. 相似文献
10.
The gastric shield and underlying stomach epithelium of Chlymas ffarreri were examined at the light and ultrastructural levels.The results showed that the gastric shield consisted of two different size lobes joined together by a narrow middle piece,the thicker lobe was shaped like a funnel,but unclosed at the lateral side;the other lobe was irregularly triangular-shaped.The transverse section of the thicker lobe was obviously laminated and gradually decreased in thickness from the peak to the margins of the shield.The underlying epithelium bore numerous about 3μm diameter spherical processes formed by the apical plasmalemma of the epithelial cells becoming blunt pseudopodia.Microvilli and some interspersed cilia were present in the areas among the spherical processes regions where only microvilli existed.Rough endoplasmic reticulum,Golgi apparatus,different-sized electron-dense secretory granules and electron-lucent vacuoles as well las abundant mitochondria were present in the underlying epithelial cells.Fused droplets of the secretion from the underlying epithelial cells formed the gastric shield. 相似文献
11.
Mangroves are unique in their biodiversity,but studies on their meiobenthic biodiversity in China are scarce.Despite the importance of mangroves,little work has been done on the classification of nematodes in mangrove wetlands.Fujian Province is the most northern point of China’s natural mangrove distribution,and it is also one of the provinces with the earliest constructed mangrove forest.In this paper,two new free-living marine nematode species of Desmodoridae from the Xiamen mangrove wetlands in China are described.Metachromadora xiamenensis sp.nov.is characterized by a cylindrical body,and smooth head capsule set off from the rest of the body.The cuticle is finely annulated and thickened at the midbody.Lateral ridges run from the posterior end of the pharynx to the middle of the tail.The amphid foveae is loop shaped and opens at the top with a double contour amphidial,pharynx with bipartite cuticularized internal cavity.There are 18 tubular precloacal supplements and tail with three small protuberances.Molgolaimus euryformis sp.nov.is characterized by a relatively short and plump body with finely annulated cuticle,which is particularly obvious in the tail.The head is small and wide with intensive striates.The inner and outer labial sensilla are indistinct with short spicules and ventral apophysis,a gubernaculum with a block-shaped hook,a swollen conical-cylindrical tail and an absence of precloacal supplements. 相似文献
12.
ImODUcrlONTheultmetruCtureofthespermatosoainteeostfisheshaddridesedtalandcomParedpelllard,l97o,Mattei,l97O).ComPatalwithotherVertebrausryisheIson,l995),FisheShavegreaterdriversityinspermatosoaultfastruCture,indudingthemorphologicalcharaCteristicaofthesperm-headsophnsteinerandPatZner,l99O),thefonnswithorwithoutacrosorapeisheIson,l995),thenumberoftheflagellum,andthedistinguishingfeaturesofAntochondrialderivatives(JawhesonandGrier,l993).AllthesearereataltotheFishposi-tioninevolutionandt… 相似文献
13.
A new species of free-living marine nematode is described from intertidal sediment of the East China Sea.The new species belongs to the Oncholaimidae family.Oncholaimus zhangi sp.nov.is characterized by males having a large ventral swelling situated just posterior to the middle of the tail,no precloacal papilla,and a row of 6–7 ventral genital setae.The tails of both males and females are similar,being conico-cylindrical in shape.The new species is distinguished from other closely related species by the presence of a prominent ventral swelling at the tail of males and a similar tail shape in both sexes.About 110valid species in this genus have been recorded to date. 相似文献
14.
15.
Structure and function of the digestive system of a bivalve mollusc, Solen grandis, were studied using light microscopy and histochemical methods. The wall of digestive tube consists of four layers: the mucosal
epithelium, connective tissue, muscular and fibrosa or serosa (only in the portion of rectum) from the inner to the outer.
The ciliated columnar epithelial cells, dispersed by cup-shaped mucous cells, rest on a thin base membrane. There are abundant
blood spaces in connective tissue layer. The digestive diverticula are composed of multi-branched duct and digestive tubules.
The digestive tubules are lined with digestive and basophilic secretory cells, and surrounded by a layer of smooth muscle
fibers and connective tissues. Activities of acid and alkaline phosphatases, esterase and lipase are detected in the digestive
cells, and the epithelia of stomach and intestine, suggesting that these cells are capable of intracellular digesting of food
materials and absorbing. Besides, acid phosphatase and esterase activities are present in the posterior portion of esophagus.
Phagocytes are abundant in blood spaces and the lumens of stomach and intestine, containing brown granules derived from the
engulfed food materials. The present work indicates that phagocytes play important roles in ingestion and digestion of food
materials, which is supported as well by the activities of acid phosphatase, esterase and lipase detected in blood spaces. 相似文献
16.
17.
REN Sulian 《中国海洋大学学报(英文版)》2003,2(2)
Structure and function of the digestive system of a bivalve mollusc, Solen grandis, were studied using light microscopy and histochemical methods. The wall of digestive tube consists of four layers: the mucosal epithelium, connective tissue, muscular and fibrosa or serosa (only in the portion of rectum) from the inner to the outer. The ciliated columnar epithelial cells, dispersed by cup-shaped mucous cells, rest on a thin base membrane. There are abundant blood spaces in connective tissue layer. The digestive diverticula are composed of multi-branched duct and digestive tubules. The digestive tubules are lined with digestive and basophilic secretory cells, and surrounded by a layer of smooth muscle fibers and connective tissues. Activities of acid and alkaline phosphatases, esterase and lipase are detected in the digestive cells, and the epithelia of stomach and intestine, suggesting that these cells are capable of intracellular digesting of food materials and absorbing. Besides, acid phosphatase and e 相似文献
18.
光镜观察湛江南三地区文蛤血细胞的形态与结构特征,并进行分类。按细胞大小、形态和结构特征可将文蛤血细胞分为4类:透明细胞、小颗粒细胞、大颗粒细胞和淋巴细胞。细胞直径有统计学上显著性差异(P<0.05),分别为10.11±0.44μm、10.99±0.32μm、9.63±0.41μm和9.22±0.25μm。透明细胞是血细胞中的主要成分,细胞质中无颗粒;小颗粒细胞的细胞质中存在大量细小颗粒;大颗粒细胞细胞质中的颗粒直径有1.0～2.5μm;淋巴细胞是血细胞中含量最少的,有很高的核质比,大约为0.5。 相似文献
19.
杜晓东 《广东海洋大学学报》1998,(3)
利用透射电镜观察九孔鲍（Haliotidaediversicoloraquatilis）的外套膜表皮细胞,结果表明细胞可分为4大类,即普通柱状表皮细胞、嗜碱性粒细胞、嗜酸性粒细胞和感觉细胞。它们在不同区域的分布、形态和数量变化与外套膜的功能分化密切相关。 相似文献
20.
The effects of membrane penetrating anti-freezing agents(MPAAs), DMSO(dimethyl sulfoxide),glycerol,EG(ethylene glycol) and methanol in combination with different cryoprotective additives suchas carbohydrates,macromolecules and inorganic compounds on the spermatozoon vitality of Chinesescallop,Chlamys farreri,during 1 h 0℃ equilibrium were investigated.When only MPAAs existed,the detrimental effects of different MPAAs ranked in the following order:DMSO相似文献