排序方式： 共有17条查询结果，搜索用时 203 毫秒
11.
12.
13.
[目的]为研究细菌刺激后,家蚕血淋巴酚氧化酶活性及其基因表达变化情况,[方法]利用实时荧光定量PCR的方法检测了喂食大肠杆菌和金黄色葡萄球菌后不同时间(6、12、24、48h)酚氧化酶原基因PPO1和PPO2的表达情况,同时测定了酚氧化酶的活性。[结果]喂食两种细菌6h、12h和24h,家蚕血淋巴中PPO1和PPO2基因上调表达,酚氧化酶活性显著高于对照组。喂食革兰氏阴性菌大肠杆菌后,PPO1和PPO2基因相对表达量及酚氧化酶活性在12h达到最高值,而喂食革兰氏阳性菌金黄色葡萄球菌在24h达到最高值。[结论]家蚕感染革兰氏阳性菌和革兰氏阴性菌,酚氧化酶活性及其基因表达存在一定差异,暗示感染不同细菌后诱发的家蚕免疫机制并不完全相同。。 相似文献
14.
15.
Abdulaziz Anas Douglas W Lowman David L Williams Stewart Millen Srinivas Somnath Pai Thavarool Puthiyedathu Sajeevan Rosamma Philip & Isaac Sarojeni Bright Singh 《Aquaculture Research》2009,40(11):1320-1327
Effect of an extraction method on the structure of glucan and its immunostimulatory response in Fenneropenaeus indicus was investigated. Here we extracted alkali insoluble glucan (AIG) and alkali soluble glucan (ASG) from a filamentous fungi Acremonium diospyri following alkali–acid hydrolysis and the sodium hypochlorite oxidation and dimethyl sulphoxide extraction method respectively. Structural analysis showed that 85% of glucan in AIG was a (1→3)-β- d -glucan and it increased the prophenoloxidase and reactive oxygen intermediate activity when administered to F. indicus . On the other hand, ASG, which contained 93% (1→3)-α-glucan, did not induce significant immune response in shrimp. Here we report that the difference in immunostimulatory potential between AIG and ASG is due to the difference in the percentage of (1→3)-β- d -glucans present in each preparation, which varies with the method of extraction employed. Also our observations suggest that glucan can be used as a potential immunostimulant to shrimp, provided it contains (1→3)-β- d -glucan as the major fraction. 相似文献
16.
利用反转录-聚合酶链式反应(RT-PCR)克隆野桑蚕(Bombyx mandarina)酚氧化酶原基因PPO1,获得其cDNA序列;该序列长2 086bp,含有一个2 058bp的完整开放阅读框,编码一个由685个氨基酸残基组成的蛋白质;该基因推导的氨基酸序列与其他鳞翅目昆虫PPO1基因相应的氨基酸序列有较高的同源性,该序列具有它们的PPO基因所共有的典型特征。RT-PCR检测分析表明该基因仅在野桑蚕的头部和血液中表达,而Northern杂交检测表明该基因仅在血液中有表达。这些结果为进一步研究该基因的功能提供了分子基础。 相似文献
17.
Growth and immune response of giant freshwater prawn Macrobrachium rosenbergii (De Man) postlarvae fed diets containing Chlorella vulgaris (Beijerinck) 
下载免费PDF全文
下载免费PDF全文 Gian Carlo Maliwat Stephanie Velasquez Jan Lorie Robil Merab Chan Rex Ferdinand Traifalgar Melchor Tayamen Janice A Ragaza 《Aquaculture Research》2017,48(4):1666-1676
A 50‐day growth trial was conducted to evaluate the efficacy of Chlorella vulgaris (Beijerinck) as an ingredient in the diets of giant freshwater prawn Macrobrachium rosenbergii (De Man) postlarvae (PL30). Immune response (total haemocyte count and prophenoloxidase activity) was also assessed by subjecting postlarvae to a challenge test against Aeromonas hydrophila (Chester) for 14 days. Iso‐nitrogenous and iso‐lipidic test diets were prepared using a fishmeal‐based‐positive control diet (D0) and four basal diets with inclusion levels of 2% (D2), 4% (D4), 6% (D6) and 8% (D8) C. vulgaris. Postlarvae of M. rosenbergii were randomly stocked (mean initial body weight of 0.19 ± 0.02 g) in 30‐L tanks in three replicates per dietary treatment for evaluation of growth performance. Another set of postlarvae (mean initial body weight of 1.25 ± 0.02 g) was randomly distributed in 95‐L tanks in three replicates per dietary treatment for the assessment of immune response. Results showed that specific growth rate was significantly higher (P < 0.05) in postlarvae fed D4 and D6. Variations in values for carcass protein, lipid, moisture and ash were also evident. Postlarvae fed diets with Chlorella showed increased prophenol oxidase activity and total haemocyte counts. Moreover, survival rate after challenge with A. hydrophila was significantly increased (P < 0.05). Inclusion of C. vulgaris in diets enhanced immune response and resistance of M. rosenbergii postlarvae against A. hydrophila infection. 相似文献