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大豆蛋白酶解工艺条件的研究 总被引：5，自引：0，他引：5
采用 As 3.350酸性蛋白酶对豆饼粉进行水解工艺条件的研究 .实验结果表明 ,原料预处理最佳工艺条件为 :5% HCl,豆饼粉加水比为 1∶ 4,90℃处理 3.5 h;酶解最佳条件为 :每克原料的酶浓度为 60 0 0 u,p H为 3.0 ,温度为 45℃ ,时间为 9h.预处理前过 70目筛 ,加入 2× 1 0 -3mol/ L的Ca Cl2 ,并加以搅拌 ,可使氨基酸态氮生成率达到 70 % ,氨基酸态氮含量达到 0 .9g/ l0 0 m L左右 相似文献
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鸭蛋清酶水解及其水解物对免疫功能的影响 总被引：1，自引：0，他引：1
用碱性蛋白酶和动物蛋白水解复合酶水解经酒精酵母脱糖后的鸭蛋清,并用正交试验确定了动物蛋白水解复合酶的最佳水解条件.结果表明,鸭蛋清浓度5%,动物蛋白水解复合酶用量(E/S)0.7%,pH8.0,反应温度54℃,反应时间4 h时水解效果最佳,水解度达92.65%.其水解物无需脱苦、脱盐和脱色.动物试验表明蛋清水解物能显著提高小鼠红细胞C3b受体花环率.而其红细胞免疫复合物花环率没有显著变化.说明蛋清水解物能在一定程度上增强小鼠红细胞免疫功能. 相似文献
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本文探讨了水解时间,质量配比、盐酸浓度、术解温度、甲壳素粒度、脱色时间及温度、浓缩结晶条件对GAH产率和质量的影响.实验表明:甲壳素水解制备氨基葡萄糖盐酸盐的水解时间控削在3.5 h、甲壳素与盐酸的质量比为1:6,盐酸浓度为36%、水解温度为90℃、甲壳素粒度为25目、脱色时间为35min、脱色温度在65～70℃、晶体与母液比在1:1左右时,产品的质量和产率最好. 相似文献
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《大众科技》2020,(5)
针对汰头废水分离蛋白质表面活性很差的特点,为提高分离蛋白表面活性,采用Alcalase碱性蛋白酶通过pH-stat法对控制分离蛋白的水解程度进行了研究,探讨水解程度对其结构和性能的影响。结果表明:随着水解度的变化,分离蛋白结构和性能变化显著。实验测得未经酶解的汰头废水分离蛋白荧光吸收峰为364 nm,粒径为5.17 nm,Zeta电位绝对值为21 mV,可溶性蛋白含量为1.36 mg·mL~(-1),起泡性仅为5%且稳定性很差,乳化性和乳化稳定性分别为13.48%和79.48%,游离氨基含量为0.15 mmol·L~(-1)。经Alcalase碱性蛋白酶处理后的分离蛋白,当水解度为3.85%时荧光吸收峰位置红移至366 nm,当水解度为1.79%时粒径最小,为3.19 nm,水解度在2.68%时Zeta电位绝对值增大至32.9 mV,当水解度为3.85%时可溶性蛋白含量最高达到2.15 mg·mL~(-1);当水解度为3.85%起泡性能最好达到50.83%,泡沫稳定性则在水解度为5.37%达到最好值为68.5%;乳化性在水解度为3.85%时达到最大值118.70%,乳化稳定性则在水解度达到4.35%时达到最大值453.40%;当水解度在4.35%游离氨基含量最大为4.5 mmol·L~(-1)。研究结果为开发汰头废水利用提供了理论依据,为后续开发新型蛋白质基表面活性剂有研究提供参考价值。 相似文献
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通过实验探讨胰蛋白酶作为牛奶蛋白质水解的优化条件。结果表明：最适宜的酶解温度为45℃；最适加酶量为每500mL牛乳加0．05g胰蛋白酶；酶解时间为30min。在确定了牛奶水解度的优化条件以后，以水解牛乳为基料，根据母乳营养特点，对蛋白质比例、脂肪酸组成及其它营养成分进行调配，设计液态婴儿乳的配方为：每1000mL成品中，水解液330．4mL，乳清粉69．66g，精练植物油7．13g，糖添加的总量7．22g，复合维生素及微量元素的添加量分别为0．58g和0．385g，水667mL。 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
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A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
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Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
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Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献
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Milton Mueller 《The Information Society》2001,17(3):151-163
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP. 相似文献
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Prof. Raymond C.K. Chen a neuropsychologist with the CAS Institute of Psychology has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology. 相似文献
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Prof. SUN Changpu from the CAS Institute of Theoretical Physics coworkers from University of Basel in Switzerland have worked out a way - at least in theory - to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams is similar to the famous Stern-Gerlach effect whereby a beam of atoms passing through a magnetic field is split in two according to the atoms' spin states 《中国科学院院刊(英文版)》2008,22(1):23-23
Prof. SUN Changpu from the CAS Institute of Theoretical Physics and coworkers from University of Basel in Switzerland have worked out a way --at least in theory --to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams and is similar to the famous Stern-Gerlach effect, whereby a beam of atoms passing through a magnetic field is split in two according to the atoms＇ spin states （Phys. Rev. Lett. 99 130403）. 相似文献