排序方式: 共有44条查询结果,搜索用时 15 毫秒
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为了对扇贝裙边进行综合利用,本文选择由中性蛋白酶、胰蛋白酶和复合蛋白酶3种酶组合成3对混合酶对扇贝裙边进行酶水解实验,以水解液中游离氨基酸态氮为考察指标,采用正交实验设计研究了加酶量、酶解时间、酶解温度及酶的种类对酶解效果的影响,从而优化了扇贝裙边的酶法水解工艺条件。以最佳水解工艺条件获得的酶解液经喷雾干燥制成的氨基酸营养粉,经检测,其粗蛋白含量为82.89%,粗脂肪含量为1.55%,总糖含量为6.82%。该氨基酸营养粉中氨基酸种类齐全,每100g粗蛋白中氨基酸总量达79.06%,其中游离氨基酸总量达51.53%。 相似文献
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Lise Torkildsen Rosie Coyne Ole Bent Samuelsen Thorolf Magnesen Øivind Bergh 《Aquaculture International》2002,10(5):399-409
High mortality rates are often observed in rearing the early stages of the great scallop, Pecten maximus. The addition of antibacterial agents has been necessary to improve larval survival. However, as one antibacterial agent, chloramphenicol, is banned in Norway and Europe the aim of this study is to investigate alternative antibacterial agents. The therapeutic agents investigated in this study were florfenicol, oxytetracycline, oxolinic acid, neomycin and Pyceze. The mean minimum inhibitory concentration (MIC) values were determined for oxytetracycline, oxolinic acid and Pyceze against bacteria isolated from scallop larvae. Two types of treatment regime were investigated on an intermediate scale (20 L). One regime involved continuous exposure of scallop larvae to the therapeutic agent while the other involved a short exposure lasting two hours. All intermediate scale treatments were performed in parallel to large-scale production (800 L) treatment with chloramphenicol. Of the therapeutants investigated, oxolinic acid was the most effective, although only at high concentrations. The short exposure of two hours was ineffective for all therapeutics. 相似文献
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河北省扇贝养殖区河口区域石油类污染分析 总被引:1,自引:0,他引:1
在河北省扇贝养殖区7条主要人海河流河口区域设立监测站位,于2007年5月枯水期和8月丰水期对水样和沉积物样品中石油类含量进行监测.河口水样平均石油类含量丰水期为0.94 mg/L,超标18.8倍;枯水期为0.51 mg/L,超标10.2倍;丰水期明显高于枯水期.河口沉积物中石油类含量丰水期为473μg/g,为标准值的0.95倍;枯水期为777μg/g,为标准值的1.55倍;部分河口沉积物中石油类含量超标严重.河口区域水体石油类污染的主要原因是大陆径流. 相似文献
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为了比较3种扇贝血液中的K+、Na+、Ca2+和Cl-浓度,血氧(pO2)和血二氧化碳(pCO2)气体分压及血液酸碱度(pH)的差异情况,实验利用血气分析仪对栉孔扇贝、虾夷扇贝和海湾扇贝的血液生理指标进行测定。结果显示,扇贝的血液生理指标呈现显著的物种差异,其中栉孔扇贝血液的K+浓度[(15.74±1.47) mmol/L]、Na+浓度[(388.07±11.38)mmol/L]、Cl-浓度[(462.43±6.88) mmol/L]和p O2[(140.13±15.35) mmHg]最高。此外,栉孔扇贝和虾夷扇贝的Ca2+浓度和pCO2含量较高,而海湾扇贝的pH最高。对相同月龄不同大小栉孔扇贝血液指标进行比较,发现栉孔扇贝的血液pH值与其壳高呈正相关(r=0.611),而生理指标与壳高呈负相关。随着温度的升高,栉孔扇贝血液的Ca2+浓度显著增加,而pO2显著下降,K<... 相似文献
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Delano D. Schleder Mirian Kayser Simone Sühnel Jaime F. Ferreira Guilherme S. Rupp Margherita A. Barracco 《Aquaculture (Amsterdam, Netherlands)》2008,280(1-4):256-263
The cultivation of scallops Nodipecten nodosus is a promising activity emerging in Brazil. The purpose of this study was to characterize the immune system of N. nodosus and evaluate the modulation of some hemato-immunological parameters during the reproductive cycle, in association with an astaxanthin-enriched diet. It was hypothesized that a supplementation on astaxanthin could enhance scallop immune system and minimize stress of reproduction. Scallops were separated in different groups: juveniles (J), adults (A), sexually mature (M), and recently spawned (S) animals. The last two groups were fed standard (M and S) or astaxanthin-enriched (Ma and Sa) diets. Scallop hemolymph contained two hemocyte populations: hyaline (HH) and granular hemocytes (GH). Antimicrobial peptides, similar to mussel defensins and mytilins, were found by immunodetection within the GH granules, even though the scallop hemolymph did not exhibit significant antimicrobial activity against different bacteria, including marine vibrios. Scallop hemocytes were able to phagocytose zymosan and produce reactive oxygen intermediates (ROI–NBT reduction). The number of circulating hemocytes (Neubauer chamber) varied from 12 to 26.106 cells mL− 1, and the GH was always the predominant cell type (67–99%). The plasma of N. nodosus contained lectins, specific to galactose and sialoconjugates, and their agglutinating activity was partially calcium-dependent. A phenoloxidase (PO) activity (146–446 U min− 1 mg− 1) was observed in the scallop hemolymph. However, this activity was not induced by trypsin or components of microorganism surface, and was strongly enhanced by alkaline pH (≥ 8.5). The total protein concentration of the plasma varied from 240 to 660 μg mL− 1. In general terms, all examined hemato-immunological parameters (hemograms, superoxide anion production, PO activity, lectin titers and total protein concentration) had a similar profile during all the scallop reproductive cycle. Their levels increased significantly from juveniles to adults (except PO activity), and declined markedly (immune depletion) in the sexually mature scallops. After spawning, the animals had a tendency to recover the standard levels of their immune parameters. Apparently, the astaxanthin-enriched diet had no effect on the tested immune parameters except for a slight influence on the scallop immune-oxidative reactions (ROI production). The results obtained in this study suggested the occurrence of a general immune depletion in the sexually mature scallops, confirming that the reproductive stage is a critical period in scallop life. 相似文献
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扇贝内脏团提取物对药物性肝损伤的保护作用 总被引:6,自引:0,他引:6
采用生化技术从扇贝内脏团中制备出具有药用价值的扇贝提取物。化学分析结果:牛磺酸含量占1.6%,糖原含量占8.2%,支链氨基酸(BACC)含量占40.71%。支链氨基酸与芳香族氨基酸克分子比(BCAA/AAA)为34.70。D—氨基半乳糖肝损伤和四氯化碳肝损伤动物模型试验结果表明,扇贝提取物能提高药物性肝损伤大鼠血清的BCAA/AAA和肝组织中抗过氧化酶活性,有纠正血清氨基酸谱紊乱和增强机体抗氧化、清除活性氧自由基能力,对肝脏具有保护作用。 相似文献
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“配合饲料”以植物蛋白质和碳水化合物为主,加以适量各种添加剂,经科学调配混合组成。蛋白质含量25-26%,脂肪84-129%,碳水化合物43-56%,并含有扇贝亲贝性腺成熟必需的微量元素和其他促进性腺成长发育的重要成分。经饲喂试验表明:亲贝性腺指数提高20-30%,亲贝成活率98%,比对照提高26%,亲贝产出优质精、卵,受精卵的孵化率93%,饲料成本降低50%,是一种完全可以代替单胞藻喂养扇贝亲贝的优良配合饲料。 相似文献