共查询到17条相似文献，搜索用时 823 毫秒
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以中华绒螯蟹（Eriocheir sinensis）为研究对象,探讨芝芪菌质对中华绒螯蟹肌肉和性腺中肌苷酸含量的影响.将中华绒螯蟹随机分成4组,每组2个平行.第1组为对照组,常规投喂;另3组为试验组,在基础饲料中按0.25%、0.5%、1%的添加剂量加入芝芪菌质,饲养90 d后,采用HPLC法测定其肌肉和性腺中肌苷酸的含量.试验表明,中华绒螯蟹在食用芝芪菌质后,试验1组、试验2组、试验3组雄性螃蟹肌肉中的肌苷酸含量相比对照组分别提高41.30%、11.59%和36.96%,差异显著（P〈0.05）;雌性螃蟹肉中的肌苷酸含量相比对照组分别提高21.92%、15.79%和10.53%,差异显著（P〈0.05）.但试验组的中华绒螯蟹性腺中的肌苷酸含量影响不大,显示芝芪菌质对芝芪菌质对中华绒螯蟹肌肉风味起到改善作用. 相似文献
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选用平均体重为75．24g的中华绒螯蟹为试验对象,分别投喂添加蚯蚓粉、BGB破壁酵母粉、DMPT作为诱食剂的饲料,进行诱食试验,通过测定日摄食率和摄食速度,比较其对中华绒螯蟹的诱食效果．结果显示：中华绒螯蟹对含蚯蚓粉、BGB破壁酵母粉、DMPT饲料的日摄食率平均分别为3．7475％、3．0542％、2．6632％,与对照组差异显著（P〈0．05）,试验结果表明,蚯蚓粉、BGB破壁酵母粉对中华绒螯蟹均具较好的诱食效果,与DMPT比较,蚯蚓粉对中华绒螯蟹引诱作用最强,BGB破壁酵母粉次之． 相似文献
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蚯蚓粉和BGB破壁酵母粉对中华绒螯蟹的诱食效果 总被引：2，自引：0，他引：2
选用平均体重为75．24g的中华绒螯蟹为试验对象,分别投喂添加蚯蚓粉、BGB破壁酵母粉、DMPT作为诱食剂的饲料,进行诱食试验,通过测定日摄食率和摄食速度,比较其对中华绒螯蟹的诱食效果．结果显示：中华绒螯蟹对含蚯蚓粉、BGB破壁酵母粉、DMPT饲料的日摄食率平均分别为3．7475％、3．0542％、2．6632％,与对照组差异显著（P〈0．05）,试验结果表明,蚯蚓粉、BGB破壁酵母粉对中华绒螯蟹均具较好的诱食效果,与DMPT比较,蚯蚓粉对中华绒螯蟹引诱作用最强,BGB破壁酵母粉次之． 相似文献
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研究了饲料中不同磷水平对中华绒螯蟹幼蟹生长及体组成的影响,确定了幼蟹对磷的适宜需要量.以酪蛋白、鱼粉和晶体氨基酸为蛋白源,磷酸二氢钙为磷源,制成磷水平为0.41%、0.82%、1.21%、1.60%、1.99%和2.42%的6种试验饲料,饲喂初始体重为0.90±0.02g的中华绒螯蟹幼蟹8周.试验结果表明:饲料中不同磷水平对中华绒螯蟹幼蟹的增重率和特定生长率影响显著,随着磷水平的增加,增重率和特定生长率呈先升高后降低的趋势,当磷水平为1.60%时达最大值;试验各组间的成活率没有显著差异;全蟹灰分、总磷和肝脏中的磷含量与饲料磷水平呈正相关;以增重率为评价指标,经折线模型分析得出,中华绒螯蟹幼蟹对饲料中磷的最适需要量为1.48%. 相似文献
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1996年10月－1997年5月，对中华绒螯蟹的肝胰腺显微和亚微结构进行了研究，结果表明：中华绒螯蟹的肝胰腺主要由四种细胞构成：E，B，R，F，细胞，E细胞胞体小，核质比大，分裂能力较强，B细胞具高尔基体，微绒毛长而稀疏，含有丰富的液泡，具分泌功能，R细胞中储存有发达的脂滴，F细胞高柱状，胞质中粗面内质网极为发达，电子密度高，主要起吸收作用。 相似文献
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同源性是指在进化过程中源于同一祖先的分支之间的关系,包括直系同源和旁系同源。直系同源基因描述在不同物种中来自于共同祖先的基因,而旁系同源基因描述在同一物种内由于基因复制而分离的同源基因。同源性与相似性是两个不同的概念,前者是质的概念,后者突出量的描述,但它们之间又有一定关系,可以通过相似性来推测序列是否具有同源性。介绍了用BLAST进行序列同源性分析的方法。 相似文献
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Branson W. Murrill 《Computer Science Education》2013,23(2):85-99
Software analysis, testing, and verification (ATV) is a major activity in the real world of software development, yet it remains underemphasized in the undergraduate computer science curriculum at most colleges and universities. This paper discusses the importance of software ATV and its relationship to other subject areas in computer science. Concepts, terminology, and techniques from software ATV are presented, and examples are given to show how they may be integrated into the undergraduate computer science curriculum. 相似文献
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Lyu Sunjian Yuan Xuemei Liu Li Zhang Haiqi Yu Zhe Hang Xiaoying Shi Weida Wu Yinglei 《Journal of Zhejiang University. Science. B》2021,22(4):295-304
Trionyx sinensis Hemorrhagic Syndrome Virus(TSHSV) is an arterivirus newly discovered in Chinese softshell turtles. Little is known about the effect of antibodies against the virus or the distribution of the virus in different organs of infected turtles. In this study, a partial protein of TSHSV-HP4 was produced using a prokaryotic expression system, and its polyclonal antibody was generated. The polyclonal antibody was confirmed by western blot and dot enzyme-linked immunosorbent assay(dot-ELISA). The distribution of TSHSV in different organs of T. sinensis was examined by immunohistochemistry(IHC) and the expression of immune-related genes was analyzed using quantitative real-time polymerase chain reaction(qRT-PCR). The results indicated that the recombinant TSHSV-HP4 protein was successfully expressed, and the generated polyclonal antibody showed specific binding to viral particles in the lung tissues of infected turtles. The IHC assay indicated that the virus was highly localized in various cells, including intestinal lymphocytes,enterocytes, kidney epithelial cells, spleen cells, lung macrophages, and cardiomyocytes. The qRT-PCR analysis revealed that TSHSV was detected in all organs tested, including the lungs, liver, kidneys, spleen, and heart. The numbers of viral mRNA copies in lung and heart tissues were significantly higher in the virus-antibody group than in the virus group. The interferonstimulated genes(ISGs), myxovirus resistance protein 2(MX2) and radical S-adenosyl methionine domain containing 2(RSAD2) were highly upregulated in all groups of infected turtles. Antibody-dependent enhancement(ADE) seemed to occur after stimulation by the polyclonal antibody, because significantly greater expression of the two genes was detected in the virus-antibody group than in the virus group. Overall, these results are important in understanding the cell localization of TSHSV and the immune response of infected turtles. 相似文献
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Don Passey 《Education and Information Technologies》2017,22(2):421-443
The subject of computer science (CS) and computer science education (CSE) has relatively recently arisen as a subject for inclusion within the compulsory school curriculum. Up to this present time, a major focus of technologies in the school curriculum has in many countries been on applications of existing technologies into subject practice (both software such as office applications, and hardware such as robots and sensors). Through uses of these applications, information and communications technologies (ICT) have focused on activities to support subject and topic learning (across wide age and subject ranges). Very recently, discussions for including computers in the curriculum have shifted to a much greater focus on computing and CS, more concerned with uses of and development of programming, together with fundamental principles of problem-solving and creativity. This paper takes a policy analysis approach; it considers evidence of current implementation of CSE in school curricula, the six main arguments for wider-scale introduction of the subject, the implications for researchers, schools, teachers and learners, the state of current discussions in a range of countries, and evidence of outcomes of CSE in compulsory curricula. The paper concludes by raising key questions for the future from a policy analysis perspective. 相似文献
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用气相色谱法（GC）分别对中华卵索线虫感染棉铃虫不同时期血淋巴中游离脂肪酸含量变化进行了分析．棉铃虫血淋巴的软脂酸、棕榈油酸、硬脂酸、油酸、亚油酸、亚麻酸等的含量都比其它类型脂肪酸的含量高得多；感染和未感染棉铃虫血淋巴中不饱和脂肪酸的相对百分含量均在80％左右，感染1～3d，感染组血淋巴中的不饱和脂肪酸总量逐渐下降，饱和脂肪酸情况相反；4d后，不饱和脂肪酸总量逐渐上升，而饱和脂肪酸情况又相反．上述研究结果将为研制接近于宿主血淋巴成分的体外培养液，促进中华卵索线虫体外培养获得成功提供了一定的理论依据． 相似文献
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高校计算机文化课考核方法的探讨 总被引：1，自引：0，他引：1
计算机化课是一门应用技术学科，仅凭学期末的一张答卷，并不能完全检测出学生的实际能力。本对高校计算机化课的考核方法进行了探讨，目的在于在计算机化课的教学和考核过程中，加强素质教育，培养具有创新精神的人才。 相似文献
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编译原理是高校计算机专业重要的骨干课程,但因该课程涉及到其他多门课程的知识,使得它成为计算机专业大学阶段中最难学的课程之一。如何教好这门课是从事这门课教学的老师们一直以来的探讨热点,作者在多年讲授这门课的基础上,提出和总结了一些行之有效的教学方法和手段,在实际教学过程中取得了良好的效果。 相似文献
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孙米 《陕西教育学院学报》2004,20(1):78-80
生物信息学是一门新兴的交叉学科，计算机科学如何更快更好地发挥其在生物信息学中的作用是我国广大计算机研究和开发人员面临的一个重要的新课题。本通过对计算机在生物信息学中若干应用的现状分析与前景展望，为高校加强计算机应用教育寻找计算机科学在生物信息学教育中的切入点提供了某些启示。 相似文献