978 resultados para Autriche, André (15..-16..) -- Portraits
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Uni-algal cultures of C. calcitrans, S. costatum, T. chui and Isochrysis sp. obtained from the laboratory were harvested. The harvest, preserved by either freezing or sun-drying, was fed to the larvae of P. monodon . Among the test algal species, Chaetoceros and Tetraselmis were used in larval feeding trials with frozen food while Chaetoceros, Tetraselmis and Isochrysis species were utilized in feeding experiments with sun-dried algae. Their relative effects on larval survival and development were assessed. Results showed that, except the alum-flocculated cells, both frozen Chaetoceros and Tetraselmis can support survival at the zoea stage. Best survival of 68% was atained with dried Chaetoceros followed by Tetraselmis at 44%. Dried Isochrysis did not perform as well, a significantly low survival of only 25% was obtained.
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A study was undertaken to determine the onset and duration of the growth phases of cultured algae commonly used as larval food (Skeletonema costatum, Chaetoceros calcitrans, Tetraselmis chuii, Chlorella vulgaris, Isochrysis galbana) so as to predict the time of harvest at the desired stage to suit various needs and purposes.
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ESSD: the new “buzz word” for environmentally sound and sustainable development. It has no greater sense of urgency and relevance than in the Asia-Pacific region.
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在整理华缨鱼属标本时发现,1993年9月在广西壮族自治区天峨县红水河水系地下河采集到的一批 标本为一个未经发表的新种,新种订名为大眼华缨鱼(&加c瑚soc^eiz獬胧gnzDp^f^8h邯)。其下咽齿2行,可与 下咽齿3行的7种华缨鱼相区别,而与属内同样具2行下咽齿的贵州华缨鱼(s.肛妇b淝瑚括)、小口华缨鱼 (Js.m幻M幻,抛£琳)和宽唇华缨鱼(5.z06缸t琳)亲缘关系较近。但:(1)新种胸鳍中点上方无黑斑,背鳍分枝 鳍条7,腹鳍分枝鳍条7,背鳍前鳞15—16,眼大,头长为眼径2.5—3.1倍,眼径为头宽44.7%一57.8%,吻 须后伸至前后鼻孔之间或眼前缘,口角须后伸至眼前缘至眼中之问或眼中至眼后缘之间,体长为尾柄高8.9一 lO.7倍,头长为吻长2.5—3.7倍,可与贵州华缨鱼(胸鳍中点上方有一明显黑斑,背鳍分枝鳍条8,腹鳍分枝 鳍条8,背鳍前鳞12—14,头长为眼径4.O一5.0倍,眼径为头宽16.6%一20.7%,吻须后伸不达后鼻孔后缘, 口角须后伸至眼前缘,体长为尾柄高7.2—8.2倍,头长为吻长1.9—2.2倍)相区别;(2)新种背鳍前鳞15— 16,侧线鳞39~40,侧线上鳞4.5—5.5,背鳍分枝鳍条7,鳃耙13,腹鳍末端伸达肛门,眼径为头宽44.7%一 57.8%,可与宽唇华缨鱼(背鳍前鳞22,侧线鳞42—45,侧线上鳞6.5,背鳍分枝鳍条8,鳃耙10,腹鳍末端 不达肛门,眼径为头宽23.3%一30.O%)相区别;(3)新种与同水系的小口华缨鱼在鳍条数、侧线鳞、体色、 斑纹等方面最为相似,但新种围尾柄鳞14/16,眼大,头长为眼径2.5—3.1倍,腹鳍末端伸达肛门,口角须后 伸至眼前缘至眼中之间或眼中至眼后缘之间,吻皮边缘深裂成小穗,背鳍起点距吻端较距尾鳍基为近,背鳍长 大于头长,体长为尾柄长4.8—5.9倍,头长为吻长2.5—3.7倍,尾柄长为尾柄高1.6—2.1倍,可与之(围尾 柄鳞12,眼小,头为眼径4.4—4.6倍,腹鳍末端不达肛门,口角须伸达眼下方,吻皮边缘不开裂或开裂不明 显,背鳍起点距吻端等于距尾鳍基,背鳍条约等于头长,体长为尾柄长6.1—6.4倍,头长为吻长2,1—2.4倍, 尾柄长为尾柄高1.4—1.5倍)相区别。
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1996年11月至1997年6月, 于雅砻江下游干流及其支流鳡鱼河中采获一批白鱼属 Anabarilius 鱼类标本, 经鉴定为西昌白鱼1新亚种。 命名为西昌白鱼雅砻亚种 Anabariliusliuiyalongensissubsp. nov. 与其它3个亚种的主要鉴别特征是: 第1鳃弓外侧鳃耙为7~10, 其余3个亚种分别为: 西昌指名亚种 A. liuiliui 为12~14, 程海亚种 A. liuichenghaiensis 15~16, 宜良亚种 A. liuiyiliangensis 10~12. 种内亚种分化主要是受到同域生态隔离和地理隔离作用的影响。
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熊虫是缓步动物门的俗称,是生活在多种生境里的微型后生动物,有一明显的头节和四个不明显的躯干“体节”,两侧有四对具爪的腿。主要分为异缓步纲和真缓步纲,前者根据体表不同形状和数量的角皮甲板以及头部成对的触须分类,后者根据吸咽板状物的数量和排列、腿末端爪的形态以及卵壳壁上的花纹分类。
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<正> 3鳖病的预防和治疗 对于鳖病的防治,一定要贯彻“全面预防、积极治疗”的方针。3.1预防措施3.1.1池塘消毒:养鳖土池、水泥池,不论发过病与否都有病原体存在。对土池通常用生石灰100—150ppm或漂白粉20ppm全池遍洒消毒。水泥地用漂白粉10ppm全池遍洒消毒即可。3.1.2工具消毒:小型工具如小手网、面盆、木桶、塘瓷桶等应在硫酸铜10ppm溶液中浸泡5—10分钟,方可杀灭各种病原体。大型用具和网具可在阳光下曝晒,必须晒干后再使用。3.1.3饲料消毒:自行配制或购买的鳖用人工配合饲料都经过加工
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<正> 茭草又称野菰(Zizania latifolia),广泛分布于我国内陆水体,在湖北省洪湖中,茭草是沿岸呈环带状分布的优势挺水植物。由于该湖年平均水深仅1.35米,底泥肥沃,适于茭草生长繁殖,群落面积已达22.7万亩,占该湖总面积的42%。每年生产茎叶干物质达15万吨以上,但绝大部分废弃分解还湖,未被充分利用。根据洪湖大水面水体生物生产力综合开发利用研究计划,我们对茭草不同器官化学成分分析的结果证明,茭草乃优质饲料,茭草叶含粗蛋白16.8—18.7%,其必需氨基酸组成比例与草鱼肌
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红娘华蛐的身体结构,一般与Mackinnon所述的R.(Embadomonas) agilis和Corradetti所述的R.grillotalpae相似,特别近似Geiman所述的R.caudacus(图15,16)。但红娘华蛐有大约等於体长2/3的大胞口,和长於或等於体长的针状尾巴,而且无论在生活时或固定染色後,头部均向背後扭曲(此较图1和15)。这些特性,显然与过去文獻中所记载的种类不同,故(氵夬)定为蛐属——新种。
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A new amino silica monolithic column was developed for DNA extraction in a miniaturized format. The monolithic column was prepared in situ by polymerization of tetraethoxysilane (TEOS) and N-(beta-aminoethyl)-gamma-aminopropylmethyldimethoxysilane (AEAPMDMS). DNA was loaded in 50 mM tris(hydroxylmethyl)aminomethane-EDTA buffer at pH 7.0 and eluted with 300 mM potassium phosphate solution at pH 10.0. Under optimal condition, a 6.0-cm monolithic column provided a capacity of 56 ng DNA with an extraction efficiency of 71 +/- 5.2% (X +/- RSD). When the amino silica monolithic column was applied to extract genomic DNA from the whole blood of crucian carp, an extraction efficiency of 52 +/- 5.6% (X +/- SD) was obtained by three extractions. Since the chaotropic-based sample loading and organic solvent wash steps were avoided in this procedure, the purified DNA was suitable for downstream processes such as PCR. This amino silica monolithic column was demonstrated to allow rapid and efficient DNA purification in microscale.
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本书是在国家自然科学基金委员会信息科学部的支持下,邀请了三十余位工作在半导体研究领域第一线的知名专家撰写而成的。本书系统介绍了当前国际、国内半导体科学和技术各个领域,包括半导体材料的生长、物理问题、重要实验和理论结果、器件结构和应用等方面的基础知识、研究现状、发展趋势和有待解决的关键问题。 本书适合从事半导体研究和教学的大学教师、科技工作者、工程技术人员、研究生、本科生以及科技管理部门有关工作人员和管理专家阅读和参考。
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海洋能利用的前景与开发策略建议ProspectsforUsageofMarineEnergyandItsDevelopmentalStrategy余志(中国科学院广州能源研究所,研究员广州510070)国内外现状及发展趋势海洋能源是指海洋中的可再生自...