异戊醇生物合成研究进展

在能源危机、环境危机和资源危机的影响下,发展新型环保替代能源越来越受到各国的重视。诸多研究证明,异戊醇与乙醇相比,具有更高的能量密度、更低的蒸汽压、更高的辛烷值等特点,更接近于汽油。就生产异戊醇所涉及到的各种技术问题,以及目前国际上研究生产异戊醇的工程菌和生物催化过程中的关键酵——酮酸脱氢酶的研究现状进行了综述,同时,也对异戊醇生物合成未来的发展趋势进行了展望

Screening and Identification of Carbohydrate-rich Microalgae and Carbohydrate Production under Different Concentrations of Nitrogen

The growth rate and starch content of four strains of microalgae preserved in our laboratory were analyzed. A carbohydrate-rich microalgae #3, as one of the four, was screened. Its growth rate and starch content could attain to 0.086 g/（L·d） and 225

“笔会”该休乎?

中国画的“笔会”该休乎？ “笔会”，古代称雅集，而且是文人之间的雅集，当代社会情境的转换与“文人”身份与质量的褪变，“雅”集也变得“雅”不起来，赤裸裸地称谓“笔会”随之产生，一种古代清雅可赏、诗情画意的脱俗境界质变为大家手持自家“武器”到场的表演。再加上当代社会的功利性、消费性、时尚性等特性背景，更很难使“笔会”“雅”起来。 当然，从文化交流传播角度讲，笔会也有其特定意义，其最大可能潜在的作用就在于直接地教育、引导了一批批人民群众，传布高雅文化于民间，让他们也能领略到束之高阁的艺术到底是怎么回事。 我想大家会一致反感的是，画家过分地热衷于笔会而且作品水平一般，格调全无。 其实，我们还是抱有一个理想，就是在条件具备的情况下，与一些尚可视为今日“文人”的艺术家再畅叙、追慕古人之“雅集”。如此，倒也有几分意味

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^