Anatomical studies on water hyacinth (Eichhornia crassipes (Mart.) Solms) under the influence of textile wastewater     

Mahmood Q  Siddiqi MR  Islam Eu  Azim MR  Zheng P  Hayat Y 《Journal of Zhejiang University. Science. B》2005,6(10):991-998

Water hyacinth (Eichhornia crassipes (Mart.) Solms) is a prolific free floating aquatic macrohpyte found in tropical and subtropical parts of the earth. The effects of pollutants from textile wastewater on the anatomy of the plant were studied. Water hyacinth exhibits hydrophytic adaptations which include reduced epidermis cells lacking cuticle in most cases, presence of large air spaces (7∼50 μm), reduced vascular tissue and absorbing structures. Textile waste significantly affected the size of root cells. The presence of raphide crystals was noted in parenchyma cells of various organs in treated plants. Project (No. 30070017) supported by the National Natural Science Foundation of China  相似文献   

人类活动历史新起源(英文)     

Peter N.Spotcs 《海外英语》2002,(1)

Archaeologists announce discovery of tools and spear points in South Africa that may be 70, 000 years old.  相似文献   

古代的文字     

Г.Г.格拉尼克  陈光苏 《山东教育学院学报》1994,(3)

近似文字的图画你可能会想:“创造文字这件事情是怎样发生的?这是我们永远也不能知道的了。”人们在祖祖辈辈的相传当中,不仅是关于文字的创造者没有留下任何记忆,而且前辈们对于古代的人是怎样想到要创造文字这件事情也都不知道了。然而,有一个人,向我们十分生动、鲜明地讲述了古代创造文字的情形,就好象他  相似文献   

学习领域和教学组织与安排   总被引：1，自引：0，他引：1  

彼德F.E.斯鲁阿纳 《中国职业技术教育》2002,(11):12-14

目前,教育界人士对职业学校的专业课程各持己见。有人认为职业技术培训过于理论化岸生无法在课堂上学到足够的应用性知识。所以,提出一个以  相似文献   

Joint rate control and scheduling for wireless uplink video streaming     

KATSAGGELOS Aggelos K. 《浙江大学学报(A卷英文版)》2006,7(5):801-810

INTRODUCTION Video streaming is becoming one of the major driving forces of next generation wireless networks. For the currently deployed cellular networks, the practical data rates are not enough to support full rate, high quality video applications. As a result, many research efforts have been devoted to adapting video content to reconcile the conflict between the high demand of video quality and the limited wireless communication resources among users. A large body of literature utiliz…  相似文献   

Do animals feel pain?   总被引：1，自引：0，他引：1  

Bateson P 《New scientist (1971)》1992,134(1818):30-33

  相似文献   

舞动的心     

Bettie B.Youngs  朱俊 《英语辅导》2007,(2)

“鲍勃!鲍勃!”我身旁的女人大声命令着,“告诉她你去年为什么不愿跟那个女人结婚!”桌子对面的鲍勃顺从地粗着嗓子回答：“哦,她呀!那真是糟透了!她对我说,要是想跟她结婚的话,我就再也不能去跳舞了!我就告诉她,‘噢,我想我做不到。’”  相似文献   

北太平洋巨型章鱼     

段玉佩  N.Tordjman  D.Florentz  M.Beurton 《少年科学》2011,(4):8-15

北太平洋巨型章鱼是170余种巨型章鱼中的一种。人们曾经误把它们看成为海怪,实际上,它们性格平和,并不像古老传说描述的那样会攻击船只。  相似文献   

言而有信     

P·诺里 《小作家选刊(小学)》2011,(4):37

在美国圣迭哥有这样两个兄弟,哥哥叫哈里,弟弟叫杰克。兄弟俩非常有钱,可他们为富不仁,经常为非作歹。不过,为了掩人耳目,他们经常用金钱来粉饰自己。他们还经常去教堂做礼拜,希望借此把自己装扮成一位完美的基督徒。  相似文献   

Grand Multiparous Women's Perceptions of Birthing, Nursing Care, and Childbirth Technology     

Fleming SE  Smart D  Eide P 《The Journal of perinatal education》2011,20(2):108-117

  相似文献