共查询到18条相似文献，搜索用时 187 毫秒
1.
锦绣龙虾消化系统的解剖学及组织学研究 总被引：1，自引：0，他引：1
锦绣龙虾的消化系统由消化管和消化腺组成,消化管包括口、食道、胃、中肠和后肠。胃分为贲门胃和幽门胃,中肠较长,占消化管总长度的74.18%。消化管的基本结构由内向外可分为4层,即黏膜层、黏膜下层、肌肉层和外膜。黏膜层主要由单层柱状上皮和基膜构成,除中肠外其余消化管管壁上皮均覆盖有几丁质膜,黏膜下层和外膜均为结缔组织层,消化道的结缔组织中分布有皮肤腺。消化腺主要是肝胰腺,由肝小管组成,根据其形态和功能的不同,可把构成肝小管的单层细胞分为四类:分泌细胞、吸收细胞、纤维细胞和胚细胞。 相似文献
2.
杜晓东 《广东海洋大学学报》1998,18(3):6-10
利用透射电镜观察九孔鲍的外套膜表皮细胞,结果表明细胞可分为４大类,即普通柱 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
3.
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
4.
波纹龙虾雄性生殖系统的解剖学与组织学研究 总被引：1，自引：0，他引：1
用解剖学和组织学方法研究了波纹龙虾雄性生殖系统,结果表明,波纹龙虾雄性生殖系统由精巢、输精管及生殖孔三部分组成。精巢横切面一般为圆形,外被一层结缔组织被膜,内部为许多圆形或椭圆形的生精小管,生精小管间充满了网状结缔组织。精子的发生经历精原细胞、初级精母细胞、次级精母细胞、精细胞和精子5个阶段。输精管管壁由外到内依次由结缔组织被膜、结缔组织、肌肉层和上皮细胞组成,管壁上的柱状上皮细胞、肌肉组织及结缔组织一起向管内延伸形成纵褶突。管壁和纵褶突上的柱状上皮细胞向管腔中分泌嗜酸性黏液。精荚呈管状,在中段输精管形成,并储存在管腔的黏液中。 相似文献
5.
【目的】研究马氏珠母贝(Pinctada martensii)贝壳基质蛋白(Shell Matrix Proteins, SMPs)基因(Pm-PNU7)表达与功能。【方法】利用马氏珠母贝基因组和蛋白质组信息分析和RACE技术克隆获得壳基质蛋白新基因Pm-PNU7全长序列,通过原位杂交对其进行定位,RNA干扰检测其对贝壳形成的影响。【结果】Pm-PNU7的cDNA全长为797 bp,编码145个氨基酸,具有特殊的"KGG"重复序列和富含天冬氨酸(Asp)序列"DDDDDDHDD"。qRT-PCR分析表明,Pm-PNU7基因在外套膜边缘区和套膜区显著高表达(P0.05);ISH检测显示,Pm-PNU7主要定位于边缘区外褶外侧和内侧上皮细胞、中褶内侧上皮细胞以及套膜区外侧上皮细胞。RNA干扰后,Pm-PNU7在外套膜边缘区和套膜区的表达量均显著下调,贝壳棱柱层和珍珠层微观结构均出现不同程度的紊乱。【结论】Pm-PNU7参与了贝壳棱柱层和珍珠层的形成。 相似文献
6.
分析了由云斑尖塘鳢(Oxyeleotris marmoratus)、线纹尖塘鳢(Oxyeleotris lineolatus)、云斑尖塘鳢(♀)×线纹尖塘鳢(♂)的杂交子一代3个实验组鱼的生长性状以及杂交子代的杂交优势。结果表明,养殖35 d后,云斑尖塘鳢与线纹尖塘鳢的杂交子一代幼鱼较云斑尖塘鳢幼鱼、线纹尖塘鳢幼鱼生长速率大;杂交尖塘鳢体质量为(1.6496±0.0501)g,比云斑尖塘鳢体质量(0.9353±0.1426)g和线纹尖塘鳢体质量(0.6690±0.0687)g差异显著(p<0.05);杂交尖塘鳢的全长为(53.63±0.83)mm,比云斑尖塘鳢全长(42.99±2.21)mm差异显著(p<0.05);从生长速率上看,杂交尖塘鳢幼鱼的杂种优势十分明显,平均为105.65%,超过云斑尖塘鳢亲本的超亲杂种优势为76.37%,超过线纹尖塘鳢亲本的超亲杂种优势为146.58%。在相同的人工养殖环境下,杂交使云斑尖塘鳢和线纹尖塘鳢幼鱼的生长得到了改良。 相似文献
7.
扬子地块北缘滑脱系统由一些发生于不同深度层次的滑脱面(带)及其之间的变形或未变形的岩石地层单位组成。鄂西北南化塘一带已确定出滑脱构造由三个主滑脱面(带)与下部强变形带、中部褶皱层及上部层滑岩片构成。这些结构单位各自都具有一定的岩石地层组成和变形构造形迹组合,并且自下而上虽然变形机制均以顺层剪切为主,但变形的性质与变形强度都有明显的变化。 相似文献
8.
作者对鳙鱼胚胎发育早期几个主要阶段发生的内部细微结构变化进行了观察。本文着重观察了卵黄、胚盘、分裂球和囊胚层细胞的形态结构,它们之间的关系以及卵黄多核体的形成。作者在鳙鱼卵子受精后所形成的胚盘和以后产生的分裂球中都发现有卵黄颗粒的存在,因而指出,认为卵子在受精后由于卵质分离而形成的胚盘是不含卵黄的看法是不确切的。在鳙鱼胚胎发育的几个早期阶段,作者观察到在胚盘、分裂球和囊胚层细胞与卵黄这种重要物质之间有某种有机联系。本文对卵黄多核体形成的问题进行了讨论。并对前人的某些观点提出了不同的看法。本文着重提到在桑椹期出现的一种深色细胞,在观察了这类细胞的发育和演变之后作者得出结论,认为它们与卵黄多核体的形成有关。 相似文献
9.
通过显微观察和组织学连续切片,对凡纳滨对虾的促雄性腺进行研究。结果表明:凡纳滨对虾的促雄性腺埋于精荚囊端壶腹外侧的肌肉中,呈不规则的块状,Harris苏木精染色呈嗜碱性。H?E染色显示,促雄性腺主要由两种形态的细胞构成,一种核质致密嗜碱性非常强,细胞核被染成深蓝色,核仁很难辨认,大多呈圆形或卵圆形(A型细胞);另一种细胞多为卵圆形,细胞核较大,核质疏松,被染成浅蓝色,核仁1～2个清晰可见(B型细胞)。此外,促雄性腺中A、B细胞的出现及其数量随精巢发育而发生变化,繁殖完成后细胞解体。 相似文献
10.
对非繁殖期与繁殖前期的雌性三角帆蚌鳃瓣作组织切片,观察其组织形态结构。结果表明,三角帆蚌内、外鳃的鳃丝在组成上是相同的,从外到内,其结构可以分为:上皮、基膜、结缔组织,鳃丝上密布纤毛,鳃丝结缔组织中含吞噬细胞、透明细胞等。外鳃具特有结构——瓣间隔和育儿囊,且在瓣间隔两侧,有发达的小水管系统。由于这种结构的存在,使得内外鳃瓣在鳃瓣厚度、鳃小瓣厚度、鳃丝宽度上存在显著性差异。繁殖前期,内鳃基本无变化,而外鳃发生明显的变化,鳃瓣增厚,鳃腔扩大形成孵化室,为胚胎发育提供一个良好的发育环境。 相似文献
11.
The distribution and ultrastructure of pigment cells in skins of normal and albino adult turbots were examined with transmission electron microscopy (TEM). Three types of pigment cells of melanophore, iridophore and xanthophore have been recognized in adult turbot skins. The skin color depends mainly on the amount and distribution of melanophore and iridophore, as xanthophore is quite rare. No pigment cells can be found in the epidermis of the skins. In the pigmented ocular skin of the turbot, melanophore and iridophore are usually co-localized in the dermis. This is quite different from the distribution in larvae skin. In albino and white blind skins of adult turbots, however, only iridophore monolayer still exists, while the melanophore monolayer disappears. This cytological evidence explains why the albino adult turbot, unlike its larvae, could never resume its body color no matter what environmental and nutritional conditions were provided. Endocytosis is quite active in the cellular membrane of the iridophore. This might be related to the formation of reflective platelet and stability of the iridophore. 相似文献
12.
SHENG Xiuzhen ZHAN Wenbin XU Songjuan CHENG Shunfeng 《中国海洋大学学报(英文版)》2007,6(4):378-382
Lymphocystis nodules occurring in the cultured sting fish Sebastes schlegeli were observed under light and electron microscope. Lymphocystis disease virus (LCDV) in the tissues of diseased fish was detected with indirect immunofluorescence test (IFAT). Results showed that lymphocystis cells had overly irregular nuclei, basophilic intracytoplasmic inclusion bodies with virions budding from the surface, and hyaline capsules outside the cell membrane. Numerous virus particles about 200 nm in diameter scat- tered in the cytoplasm, electron-dense particles 70-80 nm in diameter filled in perinuclear cisterna, and membrane-enveloped parti- cles with electron-dense core of 70-80 nm appeared around cellular nucleus. IFAT using monoclonal antibody against LCDV from Paralichthys olivaceus revealed that specific green fluorescence was present in the cytoplasm of lymphocystis cells, epithelium of stomach, gill lamellae, and muscular fibers under epidermis of S. schlegeli, just as that in the cytoplasm of lymphocystis cells of P. olivaceus, suggesting the presence of LCDV in these tissues. 相似文献
13.
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
14.
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
15.
Different geophysical exploration methods have significant differences in terms of exploration depth,especially in frequency domain electromagnetic(EM)exploration.According to the definition of skin depth,this difference will increase with the effective detection frequency of the method.As a result,when performing three-dimensional inversion on single type of EM data,it is not possible to effectively distinguish the subsurface geoelectric structure at the full scale.Therefore,it is necessary to perform joint inversion on different type of EM data.In this paper we combine the magnetotelluric method(MT)with the controlled-source audio-magnetotelluric method(CSAMT)to study the frequency-domain three-dimensional(3D)joint inversions,and we use the unstructured finite-element method to do the forward modeling for them,so that the numerical simulation accuracies of different electromagnetic methods can be satisfied.By combining the two sets of data,we can obtain the sensitivity of the electrical structure at different depths,and depict the full-scale subsurface geoelectric structures.In actual mineral exploration,the 3D joint inversion is more useful for identifying subsurface veins in the shallow part and blind mines in the deep part.It can delineate the morphological distribution of ore bodies more completely and provide reliable EM interpretations to guide the mining of minerals. 相似文献
16.
《山地科学学报》2018,(12)
Siberian larch(Larix sibirica Ledeb.) forests cover the largest areas in the Eurasian boreal zone, but there are insufficient data on its root system including the structure and functional traits of ectomycorrhizas(EM). The aim of this research is to find out if the morphological parameters of Larix sibirica EMs responded to the changes in elevation and main ecological factors(soil humidity, soil richness, soil acidity and habitat illumination). Using light microscopy, we studied EM diameter, root diameter, mantle width, and mantle volume share, share of tannin cells layers, EM density and EM length of Larix sibirica in two main types of plant communities along the elevation gradient at the Northern and Subpolar Urals. Differences in the environment were traced using phytoindication approach and the Ellenberg ecological scales. All the studied traits depend on the elevation and studied ecological factors. The diversity of fungal mantles is low, and the proportion of unstructured and pseudoparenchymatous mantles is high in response to the deterioration of the humidity, soil nitrogen content and acidity at higher-altitude habitats. Results of EM quantitative parameters measurements confirmed this pattern. We found a decline in the EM linear dimensions accompanied by a compensatory growth of the EM density with the raised elevation and the deterioration of environmental conditions. 相似文献
17.
Nephroselmis gaoae sp.nov.is described on the basis of light and electron microscope observations ofcultured material originally collected and isolated from seawater of Jiaozhou Bay,Qingdao,China.Theperiplasts on the cell body and flagella are covered by five types of scales,two types on the flagella andthree on the body.Among these,the morphology and the number of spines of large stellate body scalesdiffer remarkably from those of previously described species of Nephroselmis.Apart from these,the unusualfine structure of the eyespot(stigma)is very characteristic.As in the other species of Nephroselmis,theeyespot lies immediately under the two-membraned chloroplast envelope;unlike the others,however,it isnot composed of a number of osmiophilic globules,but consists of about 14 curved rod-shapedosmiophilic bodies arranged loosely and randomly.This feature distinguishes the present new species notonly from the other species of Nephroselmis but also from the other motile algal species,the eyespots struc-ture 相似文献
18.
Siberian larch (Larix sibirica Ledeb.) forests cover the largest areas in the Eurasian boreal zone, but there are insufficient data on its root system including the structure and functional traits of ectomycorrhizas (EM). The aim of this research is to find out if the morphological parameters of Larix sibirica EMs responded to the changes in elevation and main ecological factors (soil humidity, soil richness, soil acidity and habitat illumination). Using light microscopy, we studied EM diameter, root diameter, mantle width, and mantle volume share, share of tannin cells layers, EM density and EM length of Larix sibirica in two main types of plant communities along the elevation gradient at the Northern and Subpolar Urals. Differences in the environment were traced using phytoindication approach and the Ellenberg ecological scales. All the studied traits depend on the elevation and studied ecological factors. The diversity of fungal mantles is low, and the proportion of unstructured and pseudoparenchymatous mantles is high in response to the deterioration of the humidity, soil nitrogen content and acidity at higher-altitude habitats. Results of EM quantitative parameters measurements confirmed this pattern. We found a decline in the EM linear dimensions accompanied by a compensatory growth of the EM density with the raised elevation and the deterioration of environmental conditions. 相似文献