High-Level Production of Recombinant Lipase by Fed-Batch Fermentation in Escherichia coli and Its Application in Biodiesel Synthesis from Waste Cooking Oils.

The enzymatic production of biodiesel from waste cooking oils (WCOs) offers a green and sustainable solution for the liquid fuel manufacture as well as waste resource recovery. In present study, liquid lipase was used to simplify the catalysis process, thereby reducing biodiesel production costs. An engineered Escherichia coli expressing Geobacillus thermocatenulatus lipase 2 (GTL2) was screened at an enzyme activity of 6.96 U/mg, after evaluating the propagating stability of the recombinant plasmids exceeding 86.11%. Through the beneficial feeding strategy and effective pH control, high-level production of GTL2 by fed-batch fermentation was achieved with an enzyme activity of 434.32 U/mg, which was almost 62 times that of shake flask fermentation. In addition, liquid GTL2 was used to prepare fatty acid methyl esters (FAMEs) using WCOs. The effects of the reaction time, catalyst loading, temperature, and methanol-to-oil molar ratio on FAMEs production using WCOs were explored, and a maximum FAMEs yield of 96.62% was achieved under optimized conditions. These results indicate that liquid GTL2 is a promising biocatalyst for efficient utilization of WCOs in the synthesis of biodiesel and provide a novel enzymatic process for biodiesel reducing the cost of production.

BIBLIOMETRIC ANALYSIS OF ACUPUNCTURE RESEARCH FRONTS AND THEIR WORLDWIDE DISTRIBUTION OVER THREE DECADES.

BACKGROUND: Considerable research has been conducted on acupuncture worldwide. This study chronologically examined the changing features and research fronts of acupuncture and elucidated the differences among the six most productive countries. METHODS: Bibliographic coupling is a powerful tool for identifying the research fronts of a field. Acupuncture-related publications worldwide and from the six most productive countries during 1983-2012 were retrieved from the Science Citation Index Expanded and Social Science Citation Index. To form the research fronts, the 100 most highly cited papers (HCPs) were clustered in terms of references shared. RESULTS: The United States had the highest proportion of HCPs. The effectiveness of acupuncture in areas such as relieving neck and back pain, migraines and headaches, and knee osteoarthritis symptoms was a predominant topic. Initially, the endogenous opioid peptide system was the primary research focus in the acupuncture mechanism research; however, during 1993-2012, researchers focused more on the functional magnetic resonance imaging of brain activity. In addition, acupuncture use and prevalence, the attitudes of health practitioners, and the effects of expectancy and belief were also major topics. Researches from Western countries, including the United States, England, and Germany, showed more interest in clinical trials and economic- and ethics-related studies, whereas those from East Asian countries including China, Japan, and South Korea focused more on mechanism research. CONCLUSION: Western countries dominated the research fronts of acupuncture. The patterns of the research fronts varied worldwide, indicating continuity and innovation in research in each country.

[A bibliometric overview of traditional Chinese medicine research in Medline].

OBJECTIVE: To analyze the publication activity in traditional Chinese medicine (TCM) and learn more about the development and perspective of TCM as well as its subfields. METHODS: TCM-related publications (from 1964 to 2008) indexed in Medline were analyzed, including publication number and proportion of TCM papers, TCM clinical research papers, papers in TCM subfields such as Chinese medicine, Chinese herbs and acupuncture. We also analyzed the journals in which they got published. RESULTS: A total of 34 528 TCM-related papers were indexed in Medline from 1964 to 2008. The number and proportion of publication in Medline were increased steadily. TCM articles have changed towards clinical-oriented research, especially in complementary therapies and acupuncture subfields. Before 1973 the popular content of TCM articles was acupuncture, but at present it changed to Chinese herbs. TCM papers were found in core clinical journals, specialized complementary journals and non-core journals, the last one was the majority. CONCLUSION: The publication activity of TCM literature increased rapidly since 1970s. TCM attracts more and more attentions and researchers. The safety and efficacy of TCM have been tried to identify by conducting modern scientific researches.

[Current status of research on complementary and alternative medicine in the United States: in comparison with that on traditional Chinese medicine in China].

Researches on complementary and alternative medicine (CAM), including traditional Chinese medicine (TCM), are attracting more and more attention in the United States, and their scale and investment are progressively increasing. The differences between China and the United States in application of TCM therapies, background of Eastern and Western knowledge, thinking model, as well as the recognition of TCM theories lead to the differences in content and design of TCM researches.

[Analysis of international application of complementary and alternative medicine].

Traditional Chinese medicine (TCM) is an important part of complementary and alternative medicine (CAM) in the world medical market. The basis of globalization of TCM was to make sure the current situation of CAM and the role that TCM plays. It will improve the application and reputation of TCM by analyzing the global usage rate, sort of diseases, social-demographic characteristics of users and medical economics of CAM.