Light and electron microscope observations onNephroselmis gaoae sp. nov. (Prasinophyceae)     

C. K. Tseng  Chen Jiao-fen  Zhang Zhe-fu  Zhang Hui-qi 《中国海洋湖沼学报》1994,12(3):201-207

Nephroselmis gaoae sp. nov. is described on the basis of light and electron microscope observations of cultured material originally collected and isolated from seawater of Jiaozhou Bay, Qingdao, China. The periplasts on the cell body and flagella are covered by five types of scales, two types on the flagella and three on the body. Among these, the morphology and the number of spines of large stellate body scales differ remarkably from those of previously described species ofNephroselmis. Apart from these, the unusual fine structure of the eyespot (stigma) is very characteristic. As in the other species ofNephroselmis, the eyespot lies immediately under the two-membraned chloroplast envelope; unlike the others, however, it is not composed of a number of osmiophilic globules, but consists of about 14 curved rod-shaped osmiophilic bodies arranged loosely and randomly. This feature distinguishes the present new species not only from the other species ofNephroselmis but also from the other motile algal species, the eyespots structure of which had been previously described. Contribution No. 2316 from the Institute of Oceanology, Chinese Academy of Sciences. This paper was presented at the XIVth International Seaweed Symposium held in Brittany, France, 1992.  相似文献   

高原湖泊中萝卜螺属壳体研究现状及展望     

陈锋  冯金良 《地理科学进展》2018,37(10):1430-1441

湖泊的古水文及古水化学重建是湖泊研究领域最具挑战性的工作之一。在湖泊、河湖相及高湖面沉积物中,萝卜螺属壳体化石广泛分布;而且现生萝卜螺属亦广泛地分布于全球的湖泊及河流。这些生物碳酸盐(文石)壳体成为一种潜在的和高分辨率的环境信息记录载体。近年来,萝卜螺属的生境及其壳体的稳定碳氧同位素和元素已经逐步被用于了解青藏高原及其他地区的古水文、古水化学和古气候的信息。然而,在萝卜螺属壳体如何记录其宿生水体的古水文、古水化学等信息,以及如何基于萝卜螺属壳体化石重建古环境等方面,仍有许多科学问题有待探索。本文在前人研究的基础上,侧重在作为环境信息载体的萝卜螺属的分类体系、生境研究及其应用和壳体指标(δ¹³C_shell,δ¹⁸O_shell,⁸⁷Sr/⁸⁶Sr,Sr/Ca和Mg/Ca)特征及其在环境重建中的应用等方面进行总结和展望。  相似文献   

Two New Species of Free-Living Marine Nematodes of the Desmodoridae from Mangrove Wetlands of Xiamen Bay,China     

ZHOU Xiping  ZENG Jiali  CAI Lizhe  FU Sujing  TAN Wenjuan 《中国海洋大学学报(英文版)》2020,19(1):143-150

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   

有机锡对海洋微藻的生理效应──Ⅱ.三苯基锡和三丁基锡对扁藻和金藻光合作用的影响   总被引：2，自引：0，他引：2  

高尚德  吴以平  赵心玉 《海洋与湖沼》1994,(4)

于1991年4月-1992年1月，分别用不同浓度的三苯基氯化锡（TPTC）和三丁基氯化锡（TBTC）培养扁藻和金藻，测定24，48和72h两种藻的净光合速率和生长速率。结果表明，TBTC对两种藻的毒性大于TPTC；TPTC和TBTC在浓度为0．2μg／L时，对两种蕉的光合作用有轻微影响；浓度大干0．4μ/L，两种藻的光合作用不同程度地受到抑制。扁藻对有机锡的耐受力大于金藻：扁藻用两种锡处理后，第一天受害最严重，第二天和第三天光合速率开始恢复；金藻经TPTC处理后随时间加长光合速率稍有恢复，而经TBTC处理后则未出现恢复现象。  相似文献   

福建爬管藻属两新种——福建爬管藻和基生爬管藻     

郑怡  陈灼华 《海洋与湖沼》1992,23(1):95-100

于1983－1986年先后在福建沿岸采订爬管藻标本，进行分类研究。根据有限枝节片数目、囊果的着生位置以及围轴细胞数目等形态特征，发现其中两种标本与已知种的特征不同：一种是囊果位置不定，着生在有限枝基部第4（3）节片以上至顶端节片；另一种是有限枝节片数目较少，由5－12－（14）个节片组成囊果基生。故这为两个新种，即福建爬管8藻Herposiphonia fujianensis sp.nov和基生爬管藻H.basilaris sp.nov。模式标本保存于福建师范大学生物系植物标本室。  相似文献   

宽口虫(Steinia sp.)无性生殖周期中核器和纤毛器的演化     

王梅  宋微波 《中国海洋大学学报(自然科学版)》1996,(1)

利用改进的蛋白银染色法，研究了宽四虫（Steiiniasp．）的形态及其无性生殖周期中核器和纤毛器的发育演化过程。其发生过程为：1．大核改组带出现后，口原基出现在老口围带后方之腹棘毛左侧，其内的毛基体组装成整齐排列的小膜，构成新AZM，老AZM后部也发生部分更新的现象。2．颇腹根棘毛原基各5列，分别以3：3。3：4：3方式分化成前、后仔虫的额、腹、横棘毛。3．在第1－3列背触毛中，分别于前、后仔虫的中部范围产生第1—3列新原基，每列原基向两端伸展替代老背触毛列，成为前、后仔虫相应的第一列新背触毛。4．在前后第3列背触毛原基后端发生前、后第4列原基，它稍偏向第3列原基的右侧，向前伸展成第4列背触毛；在虫体腹面，前、后右缘棘毛原基的前方出现第5、6列背触毛原基，后发育为第5、6列背触毛，在虫体演化过程中转位到背面。  相似文献   

Tricellaria inopinata, n. sp., un nouveau Bryozoaire Cheilostome de la faune méditerranéenne     

Jean-Loup  D'Hondt Anna Occhipinti  Ambrogi 《Marine Ecology》1985,6(1):35-46

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臭氧处理海水对小球藻蛋白质、氨基酸和碳水化合物含量的影响   总被引：2，自引：0，他引：2  

王成刚  唐学玺  郑波  汤晓华 《海洋科学》2001,25(2):15-17

要用臭氧处理的海洋小球藻，分析了不同生长期小球藻的蛋白质、氨基酸、碳水化合物的含量。结果表明，一定剂量的臭氧处理海水不可提高小球藻的蛋白质含量，降低碳水化合物的含量，提高氨基酸的绝对含量，鱼类必需氨基酸占所氨基酸总量例变化不大。说明该处理有利于小球藻营养价值的提高。  相似文献   

Gene cloning and sequence analysis of the cold-adapted chaperones DnaK and DnaJ from deep-sea psychrotrophic bacterium Pseudoalteromonas sp.SM9913     

ZHAO Dianli  CHEN Xiulan  HE Hailun  SHI Mei  ZHANG Yuzhong 《海洋学报(英文版)》2007,26(6):91-100

Pseudoalteromonas sp.SM9913 is a phychrotrophic bacterium isolated from the deep-sea sediment.The genes encoding chaperones DnaJ and DnaK of P.sp.SM9913 were cloned by normal PCR and TAIL-PCR(GenBank accession Nos DQ640312,DQ504163).The chaperones DnaJ and DnaK from the strain SM9913 contain such conserved domains as those of many other bacteria,and show some cold-adapted characteristics in their structures when compared with those from psychro-,meso-and themophilic bacteria.It is indicated that chaperones DnaJ and DnaK of P.sp.SM9913 may be adapted to low temperature in deep-sea and function well in assisting folding,assembling and translocation of proteins at low temperature.This research lays a foundation for the further study on the cold-adapted mechanism of chaperones DnaJ and DnaK of cold-adapted microorganisms.  相似文献   

铬(VI)对浮游植物生长率的影响(英文)     

孙秉一  叶霖  史致丽  王永辰  薛敏 《中国海洋大学学报(自然科学版)》1990,(4)

本工作使用一次培养法初步研究了Cr(VI)对菱形硅藻和隐藻的毒性,实验结果表明,当Cr(VI)浓度大于16ppb时,则对其生长率产生抑制作用,其72小时EC_(50)值分别为260ppb和230ppb.根据活性点位模式计算了Cr(VI)与藻体的结合常数,约为2×10~5藻体中Cr含量与培养液中Cr浓度有关,两者近似指数关系,根据藻体中Cr含量和溶液中Cr的浓度,估计每个硅藻细胞与Cr最大结合容量约为5×10~(-17)mol/cell.  相似文献