Replication,pathogenicity, and transmission of SARS-CoV-2 in minks

Minks are raised in many countries and have transmitted severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) to humans. However, the biologic properties of SARS-CoV-2 in minks are largely unknown. Here, we investigated and found that SARS-CoV-2 replicates efficiently in both the upper and lower respiratory tracts, and transmits efficiently in minks via respiratory droplets; pulmonary lesions caused by SARS-CoV-2 in minks are similar to those seen in humans with COVID-19. We further found that a spike protein-based subunit vaccine largely prevented SARS-CoV-2 replication and lung damage caused by SARS-CoV-2 infection in minks. Our study indicates that minks are a useful animal model for evaluating the efficacy of drugs or vaccines against COVID-19 and that vaccination is a potential strategy to prevent minks from transmitting SARS-CoV-2.     

历史课堂中如何转变学生的学习方式

传统的教学方法是"口耳授受",即"老师讲,学生听".在这种教学方法指导下,许多学生只习惯发挥大脑储存的功能,而不习惯发挥大脑的思维功能,整天读呀、记呀、背呀,不但学习负担很重,而且收效并不理想.     

Blessings of Chinese Lunar Year of Ox

Capital Museum launches Spring Festival celebrations every year. In the advent of Chinese lunar year of ox, the museum held two exhibitions entitled ＂An Auspicious Ox Year＂ and ＂Talk about Ox in the Ox Year＂, sending new year greetings to local viewers of Beijing.     

Rosy Clouds in the Sky

From January 16 to February 10, the National Art Museum of China held a painting exhibition on its collection of ethnic minority motifs. On display included 180 pieces of painting works from the museum＇s collection, most of which are masterpieces by accomplished painters in modern China. These painting exhibits fall into such diverse categories as Chinese tTaditional painting, oil painting, print painting, watercolor painting and serial illustrations of story books. Subjects from various ethnic minorily groups of China have been depicted, which bring viewers with an opportunity to appreciate cultural diversity of China.     

Colorful China： Exhibition on Ethnic Traditions of China

The exhibition ＂Colorful China＂ was recently held in the Capital Museum in Beijing, This exhibition displayed 100 pieces or sets of masterpieces of ethnic tradition in foursections, including ＂Unity and Self-Reliance＂, ＂Ethnic Diversity and Harmony＂, ＂Superb Craftsmanship＂ and ＂Mental Cultivation＂. These historic exhibits collected by 12 different museums of China offered viewers a good opportunity to take an in-depth look at ethnic cultures and traditions preserved and promoted in the process of modernization.     

Art Exhibition of Huang Junbi Held in National Gallery

Asolo exhibition on Huang Junbi＇s paintings was recently held in the National Art Museum of China.     

中国区域化肥利用特征分析

以化肥区划中的一二级分区为研究单元,分析了我国目前的化肥施用现状,以及不同区域在化肥施肥量和肥料比例等方面的特征及差异。结过表明：黄淮海平原区、长江中下游区和东北区是我国化肥消费的主要区域,化肥消费．6-量占到了全国消费总量的2／3多;其次为西南、华南和北部高原区,占全国化肥消费总量的30％;各一级区单质氮肥和磷肥的比例在逐步下降,而复合肥和单质钾肥的比例再逐步提高。但总体而言,磷氮比近几年各一级区变化不大,稳定在0．6左右,钾氯比还处于一个很低的水平;各区域单位播种面积化肥施用量从1983年到2004年有了很大的提高。东北区、西南区和西北区历年均为全国施肥水平最低的区域,而北部高原区、华南区、黄淮海区和长江中下游区为历年全国施肥水平最高的区域。     

川东中高山地区红三叶－黑麦草人工草地刈割演替研究

本文试图对具有特殊建植目的和特殊利用方式的人工草地进行刈割演替研究。从重要值、演替距离等方面分析了不同刈割处理红三叶－黑麦草人工草地植物组成变化、群落演替趋势及群落稳定性。提出了红池坝红三叶－黑麦草人工草地建设可能出现的目标群落。认为红三叶－黑麦草人工群落刈割过重将朝黑麦草－红三叶方向发展，刈割过轻将朝灰苞蒿－红三叶－黑麦草方向发展。并进一步指出红三叶盛花期一年３次刈割的条件下，红三叶－黑麦草群落最为稳定，１ａ２－４次刈割是其刈割利用的“安全区”。     

科技期刊编辑应多挤出时间来学习

这是编辑与作者有关"一稿多投问题"的意见交流,涉及目前学术界"变相一稿多投"的不良现象.文中对这一现象进行了分析.     

治学道德的凝视：何以规范研究生学术道德

借助对“凝视”这一关键词的文本分析和解读,以治学道德对研究生学术道德的“凝视”为新的切入视角,在高校“双一流”建设的社会语境和学术语境下探寻治学道德对规范研究生学术道德的理论建构和策略理解。基于治学道德“凝视”的规范研究生学术道德的新理路在于：加强制度设计,建立规范研究生学术道德的新准则;加强法制教育,提升研究生学术道德自律的新境界;加强道德治理,建构师生学术道德共同体的新关系。