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1.
采用高压液相色谱(HPLC)测定的方法研究了有机诱变剂苯并[a]芘在实验海洋食物链(从浮游藻类褐指藻Phaeodactylum tricornutum Bohlin经中国对虾Penaeueus orientalis Kishinouye到欧氏六线鱼Hexagrammos otakii Jordan et Starks)中的流动,并对积累苯并]a[芘的中国对虾和欧氏六线鱼内脏和肌肉进行了紫露草微核(Trad-MCN)的测定,结果如下:①苯并]a[芘具有延缓褐指藻生长的作用。褐指藻中苯并[a]芘的吸着量随剂量的增大而增大。苯并[a]芯的测定量小于加入量,其损失量与剂量之间具有一定的相关性。②鱼虾内脏中积累的苯并[a]芘的浓度高于肌肉中的浓度。苯并[a]芘在中国对虾到欧氏六线鱼的传递中浓度减少,在鱼肉中很难检测到。通过显著性t测检发现,处理组和对照组虾肉之间的诱变性差异显著(P<0.05),处理组和对照组虾内脏之间的违变性差异亦显著)P<0.005)。  相似文献   
2.
There is a need for establishing a marine bioassay test set to assess marine water and sediment samples in Germany. The selected marine bioassay test set, two tests for the water phase (with the luminescence bacteria Vibrio fischeri and the algae Phaeodactylum tricornutum Bohlin) and a whole sediment test with the marine amphipod Corophium volutator (Pallas) is described and first results are shown.  相似文献   
3.
The feasibility of a bioassay based on the synthesis of phytochelatins to assess metal pollution in aquatic environments was evaluated by using the marine diatom Phaeodactylum tricornutum. Short-term incubation experiments carried out in EDTA-buffered artificial seawater showed increasing cellular phytochelatin concentration with increasing free cadmium, lead or copper in the medium, indicating that phytochelatins behave as a biomarker of exposure to the bioavailable metal fraction. A linear dose-response relationship between metal exposure and phytochelatin synthesis was found in natural seawater samples enriched with known amounts of heavy metals. Phytochelatin induction tests carried out on polluted seawater samples showed an enhanced response compared to that obtained in unpolluted seawater. This finding was found to be consistent mainly with a copper contamination.  相似文献   
4.
研究了硅藻纲三角褐指藻中多烯脂肪酸的提取分离方法和含量分析,探讨了三角褐指藻的培养温度和时间对其脂肪酸和脂质含量的影响。该藻的二十碳五烯酸含量在脂肪酸中约11%左右;脂质含量随培养条件不同而变化,一次培养为11.8%,二次培养为18.2%。该硅藻是获取二十碳五烯酸的一个新资源,可直接应用于制备多烯脂肪酸类保健药品。  相似文献   
5.
    
Microalgae such as Phaeodactylum tricornutum (PT) are a sustainable source of nutrients, especially eicosapentaenoic acid (EPA), fucoxanthin (Fx), and chrysolaminarin (Chrl), the concentrations of which can vary depending on the culture conditions. We generated three types of diets containing either an EPA- and Fx-rich (EPA/Fx) or Chrl-rich microalgae (with 5, 15, or 25% added to the diet) or an isocaloric control diet (CD). These diets were evaluated over 14 days in young C57BL/6J mice for safety and bioavailability, short-chain fatty acid (SCFA) production, and microbiome analysis. Both microalgae diets increased body weight gain dose-dependently compared to the CD. Microalgae-derived EPA was well absorbed, resulting in increased liver and fat tissue levels and a decrease in the n-6:n-3 ratio in liver tissue. Both microalgae diets increased the production of selected SCFA and decreased the Firmicutes/Bacteriodota ratio, whereas the Chrl-rich diet led to an increase in Akkermansia. Doses of up to 4621 mg Chrl, 920 mg EPA, and 231 mg Fx per kg body weight daily were tolerated without adverse effects. This pre-clinical study shows that PT is suitable for mouse feed, with positive effects on microbiota composition and SCFA production, suggesting beneficial effects on gut health.  相似文献   
6.
三角褐指藻培养条件的选择   总被引:4,自引:0,他引:4  
目的:三角褐指藻作为Tox Y-PAM生物检测技术的指示生物,其生长状态和活性程度是影响Tox Y-PAM生物检测技术检测结果的关键。为了确保试验用的三角褐指藻处于最佳活性状态,对三角褐指藻生长的主要影响因子光照、温度和氮、磷浓度进行优化选择实验。方法:采用血球计数板计数法测定生物量,通过比较不同生长条件下藻液的相对生长速率进行优化选择。结果:三角褐指藻的最佳培养条件是:2000Lux光照强度、温度20℃、培养液12mg/L氮和1.3mg/L磷。结论:在上述条件下培养三角褐指藻,藻液生长快、活性强,能够准确的反映水中毒性物质对光合作用的抑制作用.可以作为Tox Y—PAM牛物榆测技术的指示牛物。  相似文献   
7.
  总被引:3,自引:0,他引:3  
Crude polysaccharide extracts were obtained from aqueous extracts of the microalgae Chlorella stigmatophora and Phaeodactylum tricornutum. The crude extracts were fractionated by ion-exchange chromatography on DEAE-cellulose columns. The molecular weights of the polysaccharides in each fraction were estimated by gel filtration on Sephacryl columns. The crude polysaccharide extracts of both microalgae showed anti-inflammatory activity in the carrageenan-induced paw edema test. In assays of effects on the delayed hyper-sensitivity response, and on phagocytic activity assayed in vivo and in vitro, the C. stigmatophora extract showed immunosuppressant effects, while the P. tricornutum extract showed immunostimulatory effects.  相似文献   
8.
9.
目的研究硅藻门的三角褐指藻Phaeodactylum tricornutum、甲藻门的东海原甲藻Prorocentrum donghaiense和金藻门的球形棕囊藻Phaeocystis globosa的细胞增殖情况,为认识其基本生物学特性,推动海洋微藻在医药保健食品行业的应用提供参考。方法选取上述3种海洋微藻为生物材料,以添加f/2营养液的人工海水为培养介质,在植物培养箱中利用三角瓶开展为期2周的一次性培养实验。利用倒置显微镜和血球计数板观测微藻细胞密度,采用最小二乘法拟合法计算微藻日生长速率。结果 3种海洋微藻的细胞生长均经历缓慢期、快速期和平稳期3个阶段;实验结束时,三角褐指藻、东海原甲藻和球形棕囊藻的细胞密度分别约为1.126×107、1.167×107和1.210×107个/mL;其最大生长速率分别出现在第2天(1.11/d)、第4天(1.13/d)和第3天(1.02/d)。结论 3种海洋微藻的细胞增殖具有多样性;它们的最大细胞密度和日生长速率出现的时间或程度均存在一定的差异,提示在进行经济微藻培养生长过程中必须考虑各藻种的细胞增殖特性。  相似文献   
10.
海洋浮游硅藻——褐指藻Phaeodactylum tricornutum Bohlin对海水培养基中无机诱变剂镉的吸着与积累,是镉在实验海洋食物链中流动的起始。实验发现,高浓度的镉离子(>0.003mol/1)具有促使褐指藻绒聚并迅速沉淀的急性致毒作用;低于该剂量的镉离子能被褐指藻吸着与积累,并且不具有延缓生长的作用。褐指藻中积累的镉的浓度随剂量增大而增大。培养基中镉离子的减少量与剂量成线性关系。作者就褐指藻对镉离子的生物解毒作用进行了讨论。  相似文献   
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