γ射线辐照杜鹃试管苗诱发突变体的研究

研究了60 Coγ射线对杜鹃试管苗的辐射效应 ,得出试管苗的致死剂量为 2 4Gy,最佳诱变剂量为 8～ 1 6Gy,在 1 2和 1 6Gy处理试管苗中高枝嫁接后 ,发现了花色明显变异的突变体 ,连续多次转接突变体性状稳定     

一种清洗海湾扇贝装置的设计

目前,国内外海湾扇贝加工过程中海湾扇贝的清洗主要采用人工清洗,占用了大量的劳动力资源。为减少海湾扇贝加工过程中人工的参与,提出了螺旋毛刷辊式清洗海湾扇贝的方法,并做了大量的相关试验。为此,设计了专门用于清洗海湾扇贝的清洗机,并针对海湾扇贝的特点对主要功能部件进行了改良和创新设计,使其结构更简单、更实用,对海湾扇贝表面的泥沙、杂质有更好的清洗效果。设计中,采用空心的螺旋毛刷辊可同时起到清洗和运输的作用,而且毛刷辊上方有喷水管,清洗效果更好。此外,设计了废水处理装置,完成了水资源的回收再利用。     

渤海湾沉积物中氮、磷的空间分布特征研究

对2003-07在渤海湾采集的柱状沉积物中氮、磷的分布进行研究。结果表明,渤海湾柱状沉积物中氮、磷空间分布特征是近岸高,远岸低;近岸P含量达0.410mg/g,远岸含量为0.233mg/g。其中磷主要以无机磷形式存在,无机磷约占总磷的50%以上;渤海湾沉积物中氮含量较高,平均达5.96mg/g。     

薇甘菊在深圳湾的入侵路线及其生态特征

通过对入侵深圳湾沿岸的薇甘菊(Mikania micrantha H. B. K.)野外调查及室内年龄结构的分析,对薇甘菊的自然状况、生境特点、入侵路线的分析,揭示了其在深圳湾的蔓延过程.发现深圳湾沿岸薇甘菊的入侵,是由于中华民俗村的建设,从外地带来的薇甘菊种源,通过中华民俗村逸散到深圳湾.深圳湾地区的拦海造田使海水退...     

海湾扇贝性腺发育的生物学零度

性腺发育的生物学零度是生物的繁殖习性和生物积温研究中的一个重要指标。正如菊地省吾提出皱纹盘鲍性腺发育的生物学零度以后,人们已可以通过控制积温的方法有效地预报和控制鲍鱼的产卵。因此研究海湾扇贝性腺发育的生物学零度,在海湾扇贝的繁殖理论研究以及海湾扇贝的工厂化人     

象山港大型底栖动物的生物多样性和次级生产力研究

2001年8月和2001年12月对象山港8个站进行了大型底栖动物两个航次的调查取样。发现4大类底栖动物43种,其中多毛类12种(占28%)、软体动物16种(占37%)、甲壳动物6种(占14%)、棘皮动物5种(占12%)。优势种为不倒翁虫(Sternaspis scutata Ranzani)、西格织纹螺(Nassarius siquijorensis A.Adams)和滩栖阳遂足(Amphiura vadicola Matsumoto)。研究海域底栖生物多样性指数偏低、均匀度小、群落结构不稳定。象山港陆源排污量逐年增大、海水养殖规模扩大、养殖密度增加是导致生物多样性降低的可能原因。整个象山港年平均次级生产力P为4.32 g(AFDW)/(m2?a);港口最低,为0.99 g(AFDW)/(m2?a);港底最高,为7.02 g(AFDW)/(m2?a);象山港中部介于港口和港底之间。象山港大型底栖动物年平均P/B为2。     

Tin concentrations in river / bay sediments of Tokyo in 1984 and 2000

Abstract

To analyze in greater detail the fate and behavior of toxic organotin compounds in the environment, total tin (Sn) concentrations were determined for sediments of the Arakawa River, the Sumida River, and Tokyo Bay by using a graphite furnace atomic absorption spectrophotometer (GFAAS). Sn concentrations in 2000 were compared with those of 1984 (8 years before the regulation on tributyltin-based antifouling paint) as well as with other heavy metals (Cu, Ni, Pb, and Zn). The Sn concentrations ranged from 1.04 to 4.43 mg kg^?1 for sediments sampled in 2000. Although the average concentration of Sn in the sediments was low compared with that of 1984, the concentration tended to increase at several sites in 2000. Moreover, the Sn concentration showed significant correlations with the Cu, Ni, Pb, and Zn concentrations. These results suggest that a significant proportion of the overall Sn content in these sediments was probably introduced from the sources other than antifouling paint. The metals extracted from air-dried sediments with 0.1 m HCl showed that the mobility and bioavailability of Sn was low compared with those of other heavy metals.     

Microsatellite markers derived from bay scallop <Emphasis Type="Italic">Argopecten irradians</Emphasis> expressed sequence tags

ABSTRACT:   When data mining was performed on the National Center for Biotechnology Information database, a total of 2038 sequences from five different expressed sequence tag libraries were registered. Eighty sequences (3.9%) were found to contain 91 microsatellites. Clustering analysis indicated that 23 sequences of these expressed sequence tags fell into five clusters and that the remaining 57 sequences were independent. The di- and tri-nucleotide repeat motifs accounted for approximately 62.1% of the total microsatellites. The most abundant dinucleotide microsatellite was TA, followed by GA and CA, and the trinucleotide microsatellites GAT and GGT showed a high abundance. Nineteen sequences representing di-, tri-, tetra- and penta-nucleotides motifs were chosen for the design of polymerase chain reaction (PCR) primers. Of primer pairs, 16 successfully amplified scorable PCR products and 11 revealed polymorphism, with the average polymorphic information content value of 0.5082 and 3.1 alleles per locus. A transferability analysis on three other related scallop species, Chlamys farreri, Chlamys nobilis and Patinopecten yessoenssis , showed that only 1 of 16 primer pairs could amplify PCR products with the expected size in Chlamys nobilis .     

海湾扇贝亲贝室内越冬试验

海湾扇贝亲贝以３７．５个／ｍ＾３的密度在室内池越冬６０天，存活率９８％，平均性腺指数开始为１４．３％，最终为１３．９％。与自然海区越冬相比，亲贝存活率提高２５￣７５％，平均性腺指数提高５．６￣８．１％。