跨越数字鸿沟,维护读者权利,实现信息公平--湖南大学图书馆2005年"优质服务宣传"活动拉开帷幕

文章介绍了湖南大学图书馆2005年“优质服务宣传”活动开幕式的情况,记录了与会的专家学者关于“数字鸿沟”的精辟论点。     

开拓高校图书馆"发现与发展知识"功能探讨

从图书馆的生存、发展和本身的义务、职责及读者的需求几个方面，探讨了开拓高校图书馆“发现与发展知识”功能的必要性、遵循的原则和应采取的措施。     

大众传媒的社会责任与未成年人的良性互动

在媒介社会化和社会媒介化时代，人类在享受媒介带来的社会进步、便利和好处的时候．也要承受它们所带来的种种麻烦．当然也必须解决和消化它们带来的种种问题。     

游戏类电视节目中的游戏规则

本文所说的游戏类电视节目，是指以《快乐大本营》、《欢乐总动员》、《超级大赢家》为代表的电视娱乐节目。这种类型的节目曾在1997年7月11日湖南电视台《快乐大本营》的推出后在国内红极一时．但随着时间的推移此类节目生存形势严峻．有必要研究其生存之道。     

高校图书馆“毕业季”延伸服务的调查与思考

[目的/意义] 毕业生是高校图书馆的特定用户之一,对"毕业季"延伸服务和活动进行调查与分析,可为相关实践工作提供参考。[方法/过程] 对2017年高校图书馆"毕业季"延伸服务和活动的网页新闻发布、微信推送情况进行抽样调查,并分析其总体特点。[结果/结论] 从专项经费和运营团队、馆员的情感与精力、经典项目、创意服务、与校友延伸服务对接、品牌化与推广方面,提出改进高校图书馆"毕业季"延伸服务的建议。     

Precision measurement of the Newtonian gravitational constant

The Newtonian gravitational constant G, which is one of the most important fundamental physical constants in nature, plays a significant role in the fields of theoretical physics, geophysics, astrophysics and astronomy. Although G was the first physical constant to be introduced in the history of science, it is considered to be one of the most difficult to measure accurately so far. Over the past two decades, eleven precision measurements of the gravitational constant have been performed, and the latest recommended value for G published by the Committee on Data for Science and Technology (CODATA) is (6.674 08 ± 0.000 31) × 10⁻¹¹ m³ kg⁻¹ s⁻² with a relative uncertainty of 47 parts per million. This uncertainty is the smallest compared with previous CODATA recommended values of G; however, it remains a relatively large uncertainty among other fundamental physical constants. In this paper we briefly review the history of the G measurement, and introduce eleven values of G adopted in CODATA 2014 after 2000 and our latest two values published in 2018 using two independent methods.     

试论当代文学与“中国梦”的关系

二十一世纪的今天,随着中国不断地发展、强大,实现中华民族的伟大复兴成为党中央和整个国家重视的中心目标,"中国梦"的概念应运而生。在这个发展的过程中,加强思想上的引导是至关重要的。当代文学的定位和发展就应该以习近平总书记提出的"传播当代中国价值观念,体现中华文化精神,反映中国人的审美追求"为目标、准绳。     

Simultaneous changes in seed size,oil content and protein content driven by selection of SWEET homologues during soybean domestication

Soybean accounts for more than half of the global production of oilseed and more than a quarter of the protein used globally for human food and animal feed. Soybean domestication involved parallel increases in seed size and oil content, and a concomitant decrease in protein content. However, science has not yet discovered whether these effects were due to selective pressure on a single gene or multiple genes. Here, re-sequencing data from >800 genotypes revealed a strong selection during soybean domestication on GmSWEET10a. The selection of GmSWEET10a conferred simultaneous increases in soybean-seed size and oil content as well as a reduction in the protein content. The result was validated using both near-isogenic lines carrying substitution of haplotype chromosomal segments and transgenic soybeans. Moreover, GmSWEET10b was found to be functionally redundant with its homologue GmSWEET10a and to be undergoing selection in current breeding, leading the the elite allele GmSWEET10b, a potential target for present-day soybean breeding. Both GmSWEET10a and GmSWEET10b were shown to transport sucrose and hexose, contributing to sugar allocation from seed coat to embryo, which consequently determines oil and protein contents and seed size in soybean. We conclude that past selection of optimal GmSWEET10a alleles drove the initial domestication of multiple soybean-seed traits and that targeted selection of the elite allele GmSWEET10b may further improve the yield and seed quality of modern soybean cultivars.     

新课程理念下生物学习题课教学的有效性

本文从生物学习题课的备课和上课两方面阐述了如何进行生物学习题课的有效教学,并列举一些实例加以评析。