随着水体富营养化加剧,藻类所引起的水污染问题已越来越引起人们的关注,蓝藻是目前已知产生毒素最多、对人类健康造成的危害最大的藻类。微囊藻毒素-LR(microcystins-LR,MC-LR)是有毒蓝藻细胞合成的二级代谢产物,是一种细胞内毒素。微囊藻毒素可影响鱼类的胚胎发育和生长,也可引起肝脏、肾脏等内部器官的病理变化,和导致鱼体的氧化损伤等。然而,有关微囊藻毒素对鱼类分子水平上的毒性效应的研究则很
Rwanda made a splash during the China Intational Fair for Trade in Services (CIFTIS) in Beijing. Interested business people flocked to its investment and trade
动物究竟能否预言地震?如果有,它们的本领究竟是怎么炼成的呢?动物真能预言地震2008年5月9日,在四川绵竹市西南镇檀木村出现了一个奇异景象,数十万只蛤蟆突然出现在了人们的视野,他们蹦蹦跳跳地穿街过巷,对包括人在内的所有阻拦或威胁,都不放在眼里。即便是在公路上有不少蛤蟆被汽
According to a recent online survey on socializing by Guangming Daily, of the 2,532 people polled, 97 percent reported that they often try to duck socializing i
Sixteen people from six poverty-stricken families became the biggest test for Xie Wanju, First Secretary of the Communist Party of China (CPC) Zhadong Village B
2012年11月,由《大公之友》主办,香港《大公报》和中华文化艺术学会协办的“青春时代”当代新水墨代表艺术家曾健勇个人画展在香港中央图书馆隆重开幕,展览汇集了其50幅代表
所谓“以学定教”即要求教师的“教”是建立在学生自主学习新知,自主发现问题、提出问题和解决问题的基础上。“以学生为本”,着眼于学生的发展,根据学生的实际来确定自己的教学
For years Peng Weixu, a sixth grader at the Gezhi Middle School in port city Dalian in northeast China, had worshipped Superman and Ultraman, the fictional supe