排序方式： 共有8条查询结果，搜索用时 184 毫秒
1
1.
A group of coenocytic marine algae differs from higher plants,whose totipotency depends on an intact cell(or protoplast).Instead,this alga is able to aggregate its extruded protoplasm in sea water and generate new mature individuals.It is thought that lectins play a key role in the aggregation process.We purified a lectin associated with the aggregation of cell organelles in Bryopsis hypnoides.The lectin was ca.27 kDa with a pI between pH 5 and pH 6.The absence of carbohydrate suggested that the lectin was ... 相似文献
2.
前言以1971年2月发生在洛杉矶郊外的圣费尔南多地震为教训,人们认识到,在日本,特别是在人口稠密的大城市,也有必要确立地震对策。设置在日本煤气协会内的通产省资源能源厅长官私人咨询机构“大城市煤气事业对策调查会地震对策专门委员会”曾就以下问题回答了咨询:①制定煤气管道抗震设计的规定;②使用富有展延性的管材及提高接口的抗震性;③整个煤气供应系统的防灾体制;④推进地震仪和截断装置等的设置;⑥充实和扩充无线通讯设备等。 相似文献
3.
Gracilaria lemaneiformis Bory is an economically important alga that is primarily used for agar production. Although tetraspores are ideal seeds for
the cultivation of G. lemaneiformis, the most popular culture method is currently based on vegetative fragments, which is labor-intensive and time-consuming.
In this study, we optimized the conditions for tetraspore release and evaluated the photosynthetic activities of different
colonies formed from the branches of G. lemaneiformis using a PAM (pulse-amplitude-modulated) measuring system. The results showed that variations in temperature and salinityhad
significant effects on tetraspore yield. However, variations in the photon flux density (from 15 μmol m−2 s−1 to 480 μmol m−2 s−1) had no apparent effect on tetraspore yield. Moreover, the PAM-parameters Y(I), Y(II), ETR(I), ETR(II) and F
v/F
m of colonies formed from different branches showed the same trend: parameter values of first generation branches>second generation
branches>third generation branches. These results suggest that the photosynthetic activities of different colonies of branches
changed with the same trend. Furthermore, photosynthesis in G. lemaneiformis was found to be involved in vegetative reproduction and tetraspore formation. Finally, the first generation branches grew
slowly, but accumulated organic compounds to form large numbers of tetraspores. Taken together, these results showed that
the first generation branches are ideal materials for the release of tetraspores. 相似文献
4.
In 2008,a green tide broke out before the sailing competition of the 29th Olympic Games in Qingdao.The causative species was determined to be Enteromorpha prolifera (Ulva prolifera O.F.Müller),a familiar green macroalga along the coastline of China.Rapid accumulation of a large biomass of floating U.prolifera prompted research on different aspects of this species.In this study,we constructed a nonnormalized cDNA library from the thalli of U.prolifera and acquired 10 072 high-quality expressed sequence tags ... 相似文献
5.
6.
An improved method of PCR in which the small segment of conchocelis is amplified directly without DNA extraction was used to amplify a RUBISCO intergenic spacer DNA fragment from nine species of red algal genus Porphyra(Bangiales,Rhodophyta),including Porphyra yezoensis(Jiangsu,China),P.haitanensis(Fujian,China),P.oligospermatangia(Qingdao,China),P.katadai(Qingdao,China),P.tenera(Qingdao,China),P.suborboculata(Fujian,China),P.pseudolinearis(Kogendo,Korea),P.linearis(Devon,England),and P.fallax(Seattle,USA).... 相似文献
7.
In 2008, a green tide broke out before the sailing competition of the 29th Olympic Games in Qingdao. The causative species
was determined to be Enteromorpha prolifera (Ulva prolifera O. F. Müller), a familiar green macroalga along the coastline of China. Rapid accumulation of a large biomass of floating
U. prolifera prompted research on different aspects of this species. In this study, we constructed a nonnormalized cDNA library from the
thalli of U. prolifera and acquired 10 072 high-quality expressed sequence tags (ESTs). These ESTs were assembled into 3 519 nonredundant gene groups,
including 1 446 clusters and 2 073 singletons. After annotation with the nr database, a large number of genes were found to
be related with chloroplast and ribosomal protein, GO functional classification showed 1 418 ESTs participated in photosynthesis
and 1 359 ESTs were responsible for the generation of precursor metabolites and energy. In addition, rather comprehensive
carbon fixation pathways were found in U. prolifera using KEGG. Some stress-related and signal transduction-related genes were also found in this study. All the evidences displayed
that U. prolifera had substance and energy foundation for the intense photosynthesis and the rapid proliferation. Phylogenetic analysis of
cytochrome c oxidase subunit I revealed that this green-tide causative species is most closely affiliated to Pseudendoclonium akinetum (Ulvophyceae). 相似文献
8.
日本品系裙带菜无性繁殖系生产性育苗技术 总被引：6，自引：0，他引：6
裙带菜(Undariapinnatifida)无性繁殖系育苗法是90年代初由中国科学院海洋研究所应用细胞工程方法发展起来的一种新的育苗方法[1],该方法利用培养的裙带菜无性繁殖系进行育苗,大大缩短育苗时间,降低人力、物力的消耗,出苗整齐不脱苗,可以进行多茬育苗,实现多茬养殖。以山东省为例,室内常规育苗法需3～3.5个月左右,才能培养出达商品标准的幼苗,而无性繁殖系育苗法最多只需1.5个月,这样就大大地降低了成本,并且提高了育苗成功的稳定性[2]。1993年中科院海洋研究所曾以山东自然种群为苗源,成功地进行了生产性育苗实验。但近年来,山东自然种群… 相似文献
1