排序方式： 共有13条查询结果，搜索用时 15 毫秒
1.
李兆新 《中国海洋湖沼学报》2009,27(3):468-472
We investigated the metabolism of pectenotoxins in brown crabs(Cancer pagurus).The crabs were fed with blue mussels(Mytilus edulis) for 21 d then depurated for 42 d.We extracted the toxins from the digestive glands of contaminated crabs,uncontaminated crabs(control group),and the meat of blue mussels using methanol.Extracts of the crab digestive glands were fractionated by liquid-liquid partitioning and solid phase extraction.The fractions were analyzed by liquid chromatography coupled with tandem mass spec... 相似文献
2.
B. R. Stanton 《新西兰海洋与淡水研究杂志》2013,47(4):703-712
Abstract Semidiurnal variations in the depth of the thermocline observed near the shelf edge north‐west of Cape Egmont are probably caused bv an internal tide generated at around 200 m depth over the continental slope. The observations suggest that in this region an internal tide, with amplitude of about 20 m, propagates onto the shelf with a speed of approximately 0.5 m·s?1 and a wavelength of about 22 km. 相似文献
3.
The aim of this research was to decompose isoproturon and adsorb its photoproducts by developing a carbon material from a juice industry waste. Carbon-TiO2 hybrid materials were obtained by impregnating carbonized guava seeds with TiO2 gels prepared from TiOSO4⋅xH2O and NH4OH using glycerol as a binder and thermally treating the materials at 500 °C. Raman studies confirmed the anatase phase of TiO2. SEM images showed isolated TiO2 agglomerates firmly attached to the carbon surface. The adsorption behavior of isoproturon on guava carbon was studied and yielded S-type adsorption isotherms. The photocatalytic activities of the prepared hybrid materials were monitored to study the kinetics and elimination process both of the herbicide and its photoproducts. The reaction was monitored by UV–Vis spectrophotometry, LC-DAD and LC-MS, enabling identification of some intermediate species. Among the photoproducts produced by carbon-TiO2 hybrid materials, amino-isopropylphenol was detected. 相似文献
4.
The morphology and toxicity ofPseudo-nitzschia strain PP0201-01, isolated near the estuary of Changjiang (Yangtze) River in Year 2002 and tentatively identified asPseudo-nitzschia pungens, were studied. The strain was identified morphologically asP. pungens using scanning electronic microscope (SEM). The analytical results of LC-PDA (liquid chromatography with photodiode array
detector), LC-MS (liquid chromatography with mass detector), and the toxicity data from mouse bioassay, showed that no domoic
acid was produced by the strain. However, the mechanism of domoic acid production byPseudo-nitzschia species is complicated. More works are needed to assess the toxic species and to evaluate the potential risk of amnesic shellfish
poisoning (ASP) in China.
Supported by the projects of Ministry of Science and Technology (No. 2001CB409704 and No. 2001BA804A20), and the innovation
project of the Institute of Oceanology, CAS (No. 200223107). 相似文献
5.
为确定中国沿海不同地区织纹螺中的毒素成分,本研究在江苏省、浙江省和福建省设立了多个采样点,对采集的半褶织纹螺样品进行了毒性测试和毒素组成分析。研究结果显示,采集的织纹螺样品毒性范围为2—664MU(mouse unit)/g湿重,其中,采自江苏省连云港地区的织纹螺样品毒性远高于其它地区。应用高效液相色谱-质谱联用(high-performance liquid chromatography-mass spectrometry,LC-MS)方法对样品中的毒素成分进行分析,在各地的织纹螺样品中均检测到了河豚毒素(TTX)及trideoxy TTX、4-epi TTX和anhydro TTX等衍生物,但各种毒素成分所占的比例存在差异。自江苏省连云港市和浙江省舟山市采集的织纹螺样品中,Trideoxy TTX是主要的毒素成分,TTX和其它两种毒素成分次之;而自江苏省盐城市、浙江省宁波市及福建省宁德市和莆田市采集的织纹螺样品中,TTX的含量最高。采集自江苏省连云港和浙江省舟山市的大部分织纹螺样品中,肌肉组织的毒素含量最高,其次是消化腺组织,其余组织中的毒素含量最低。高毒性成分TTX的最高值主要出现在肌肉组织或消化腺组织中。从实验结果可以看出,各地的有毒织纹螺中毒素成分基本一致,而各种毒素成分所占的比例有一定的差异,织纹螺的毒性与高毒性成分TTX的含量有关。 相似文献
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Gloeobacter violaceus PCC 7421是一种在进化上很古老的无类囊体蓝藻,由于光合作用电子传递链与呼吸系统在其细胞质膜上共存,这两个系统可能会共享一些元件,为研究其光合作用系统结构的独特之处,应用高效液相色谱-串联质谱联用(LC-MS/MS)技术对其细胞膜蛋白进行蛋白质组学分析.经鉴定发现, G. violaceus的细胞质膜上具有PSⅠ、PSⅡ和细胞色素b6等光合作用关键蛋白,同时具有呼吸作用过程中的关键酶1,5-二磷酸羧化酶/加氧酶、F0F1- ATP酶α和β亚基、细胞分裂蛋白、硝酸盐/亚硝酸盐转运蛋白、青霉素结合蛋白以及多种药物受体ABC转运蛋白.由此可知, G. violaceus的细胞质膜不仅能够同时进行光合作用和呼吸作用,且营养盐运输等转运功能也同时存在.G. violaceus的全基因数据分析显示其基因序列具有独特性,其蛋白注释相对比较少,因此其蛋白功能的研究需要更多数据的支持. 相似文献
7.
本文对比研究了QuEChERS、加速溶剂萃取和超声提取三种方法,结合液相色谱-串联质谱法解决了土壤中18种极性强、热稳定性差的痕量氨基甲酸酯和三唑类农药提取难题。研究表明,Qu ECh ERS法的基体加标回收率为76.3%~121.0%(除涕灭威为27.5%外),超声提取法为71.0%~100.0%(除涕灭威为4.7%,涕灭威亚砜为137.8%外),加速溶剂萃取法大多低于70%(甲硫威、涕灭威、三唑醇几乎没有回收),可见QuEChERS法比另两种提取方法结果更优,最终确定为检测氨基甲酸酯类和三唑类农药的样品提取方法。涕灭威回收率偏低、涕灭威亚砜回收率偏高与提取方法的热效应有关;仲丁威、甲萘威等组分的回收状况与土壤类型相关。 相似文献
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The morphology and toxicity of Pseudo-nitzschia strain PP0201-01, isolated near the estuary of Changjiang （Yangtze） River in Year 2002 and tentatively identified as Pseudo-nitzschia pungens, were studied. The strain was identified morphologically as P. pungens using scanning electronic microscope （SEM）. The analytical results of LC-PDA （liquid chromatography with photodiode array detector）, LC-MS （liquid chromatography with mass detector）, and the toxicity data from mouse bioassay, showed that no domoic acid was produced by the strain. However, the mechanism of domoic acid production by Pseudo-nitzschia species is complicated. More works are needed to assess the toxic species and to evaluate the potential risk of amnesic shellfish poisoning （ASP） in China. 相似文献
10.
《African Journal of Marine Science》2013,35(2):273-281
Diarrhetic shellfish poisoning (DSP) poses a significant threat to the safe consumption of shellfish in the southern Benguela ecosystem. The accumulation of DSP toxins was investigated in two cultivated bivalve species, the Pacific oyster Crassostrea gigas and the mussel Choromytilus meridio-nalis, suspended from a mooring located off Lambert's Bay on the west coast of South Africa. The dinoflagellate Dinophysis acuminata, a known source of polyether toxins associated with DSP, was common through most of the study period. The toxin composition of the dinoflagellate was dominated by okadaic acid (OA) (91%), with lesser quantities of the dinophysistoxin DTX-1 (6.5%) and pecteno-toxin PTX-2 (2.4%), and traces of PTX-2sa and PTX-11. The mean cell toxin quota of D. acuminata was 7.8 pg OA cell–1. The toxin profile in shellfish was characterised by a notably higher relative content of DTX-1. The study showed the average concentration of DSP toxins in the mussels to exceed that in the oysters by approximately 20-fold. The results indicate a need to establish species-specific sampling frequencies in shellfish safety monitoring programmes. 相似文献