Seed aging decreases the quality and vigor of crop seeds,thereby causing substantial agricultural and economic losses in crops.To identify genetic differences i
《语文课程标准》中提出了三维立体教学目标，其中非常重要的一条便是情感目标：“应让学生在主动积极的思维和情感活动中，加深理解和体验，有所感悟和思考，受到情感熏陶。”语文教学
重庆市一所学校上了一堂特殊的理账课，让100名初一学生说说“父母养你花了多少钱”。收上来的成长账单显示，父母为孩子平均花了18万元，最多达42万元，最少的也有6．2万元（5月6日《重
In view of the prospect of irregular extremes of high and low rainfall due to climate change,themechanisms underlying plant responses to periods of drought and
Dissecting the genetic architecture of complex traits is an ongoing challenge for geneticists.Two complementary approaches for genetic mapping,linkage mapping a
Projected changes in weather parameters, mainly temperature and rainfall, have already started to show their effect on agricultural production. To copewith the
Thymus daenensis, a perennial herb, is often grown in areas that experience drought conditions during its growing period. Application of chitosan may compensate
Climate change is affecting global crop productivity, food quality, and security. However,few studies have addressed the mechanism by which elevated CO2 may aff
自主学习在各种学习方式中居于重要地位，它对于学生的主体性、自立性、自觉性、主动性、创新性的发展具有重要意义。因此，教师除了注重自己的教以外，更应注重学生的学，把学生当做
“教育要面向现代化,面向世界,面向未来。”这是小平同志在1983年为北京景山学校的题词。“教育现代化”在改革开放的30年中,得到了最真切的注解。从“教学挂图”到“幻灯机”再到“多媒体”,课堂教学媒体的现代化已是不争的事实;从“教室”到“语音教室”再到“网络教室”,学校办学条件的现代化也是不争的事实。 然而,随着“教育现代化”的推进,除了我们眼睛所能看到的硬件实物之外,似乎更应该侧重于软件的开发,