Exploration of an online and offline mixed teaching mode for "Protein Engineering" based on BOPPPS+flipped classroom / 生物工程学报

Protein Engineering is a core compulsory course of biotechnology major, which is the first-class undergraduate major being constructed in Shanxi Province. In view of the problems of single teaching mode of Protein Engineering, such as insufficient students' participation, short teaching time, and expensive experiment cost, the course team carried out the reform and practice of teaching mode for this course, and put forward a new teaching strategy. Under the guidance of the "Golden Course" standard for advancement, innovation and challenge, the course team developed the materials for massive open online courses (MOOC), and carried out the online and offline mixed teaching of Protein Engineering based on BOPPPS+flipped classroom by using the Chao-Xing Fan-Ya network teaching platform. Through this, a comprehensive, systematic and dynamic new teaching system of Protein Engineering was developed. Using the teaching mode based on BOPPPS+flipped classroom, the offline classroom teaching was combined with students' online self-study and homework completion, chapter test and discussion, and this mixed teaching mode was fully integrated into the flipped classroom. After three rounds of teaching practice, the course team had developed a complete, reproducible, scientific and reasonable online and offline mixed teaching mode, which included course materials preparation, exploring experiment guidance, classroom discussion design and course performance evaluation. The online and offline mixed teaching mode of Protein Engineering based on BOPPPS+flipped classroom was helpful for students to improve their autonomous learning ability, to be deeply engaged in the whole teaching process, and to develop a comprehensive and profound understanding of Protein Engineering. This teaching mode improved the teaching quality of Protein Engineering, and facilitated students to learn other follow-up professional courses. Moreover, it provides a reference for the course teaching reform.

Analysis of exogenous gene and protein digestion and absorption of SD rats (Rattus norvegicus) fed roundup ready soybean meal / 生物工程学报

Metabolism and deposition of exogenous gene and protein from transgenic glyphosate herbicide-tolerant soybean meal in SD rats were studied in the experiment. The transgenic soybean GTS40-3-2 meal and its non-transgenic counterpart (parent A5403) were fed to the generation and the second generation Sprague-Dawley (SD) rats (Rattus norvegicus). The study added the genetically modified (GM) soybean meal and its non-transgenic control soybean meal (parent A5403) in a ratio of 20% respectively to the feeds. By using qualitative, quantitative PCR and ELISA methods to detect transgenic soybean residues of metabolism ingredients in rats, the safety and influence of GM soybean were evaluated. The results showed that the intestinal fecal and cecum contents of rats were detected with residues of GM ingredients, intestinal flora and organs were not found related genes and protein. These results indicated that transgenic glyphosate herbicide-tolerant soybean GTS40-3-2 meal was as safe as its non-GM soybean meal in long-term feeding study.

Detection of transgenic components in animal feeds on Shanxi markets / 生物工程学报

To assess the presence of genetically modified (GM) maize and soybean in a range of commercialized feed in Shanxi province of China in 2015, improved hexadecyltrimethy ammonium bromide (CTAB) method was used to extract DNA. The screening of packed feeds was carried out by qualitative PCR. Then positive feeds were unpacked and detected by the CaMV 35S promoter, NOS terminator, zSSIIb, Lectin and CryIA (b) genes. The identified maize and soybean events were confirmed by event-specific MON810 and GTS40-3-2. Results showed that 83.3% of the feeds was tested positive for GMOs, in which positive rates of maize, soybean, pig and layer feeds were 6.67%, 100%, 93.3% and 73.3%, respectively. The results of real-time PCR were consistent with qualitative PCR. These results indicated that commercialized GM feed had a wide positive product scope in Shanxi province of China. Further studies are necessary to study effects of feeding livestock and poultry with feed containing GM ingredients on animals and their products.