鳥类的干制     

Г.А.古里雅諾夫  罗润庠 《生物学教学》1959,(7)

在生物学課堂教学中,直观教具的演示,是教学和教育工作中不可缺少的一部分。但生物教师却不能每一堂都能安排好必要的教具。这是由于教师不会自己制备教具的緣故。我从事各种直观教具,特别是对爬行类、鳥类与哺乳类动物的干制标本,已有十余年的經驗。本文將介紹应用40%的福尔馬林溶液注射于动物屍体的方法干制鳥类标本的经验。剥制法虽比干制法效果好一些,但时間需要较长;此外,剥制时所用的砒霜或砷酸钠这些毒物,往往有危險,而且这些毒物又不易买到。干制只需用福尔馬林,危險性少,而每个藥房也都可买到。干制不同于剝制,以后会干縮变小,但形狀颜色不变。在一定的保存条件(玻璃柜中)下和适当的保养(每一年撒上一层萘粉、六六六药剂等),干制标  相似文献   

实施素质教育 强化常规管理     

支少华 《安徽教育论坛》2001,(2):9-9

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对医预科学校学习目标的建议     

Miles J. Schwartz!英  王卫国  梅人朗 《复旦教育论坛》2000,(1)

最近，美国医学院校协会（ＡＡＭＣ）发表了医学院校学习目标报告（ＭＳＯＰ）以协助各院校培养“能够满足社会需求”的新一代医生。两份ＭＳＯＰ报告总体上是鼓励开发医预科学校的学习目标，建立这种学习目标能确保这些未来的医学生较好地面对医学院校的课程，这些课程已经限定了他们在四年中所学的内容。那些不能在标准医学课程中扩展的教育要素能在本科生教育中予以提供，医预科教育也能包含这些内容，例如：通讯技能，写作和演讲；医学的心理社会方面内容，从伦理学到医患关系的延伸；统计学，包括介绍以证据为基础的医学的概论；信息学…  相似文献   

FLOSSWorld全球调查结果显示服务器更多使用开源软件     

Rishab A.Ghosh  刘佐达 《中国教育网络》2007,(1):39-39

FLOSSWorld调查的主体由5部分构成,包括:个人(Private sector)、政府(Government sector)、开源社区参与者(Open Source participants community)、高校管理者(Heigher Education Institutes——Administrators)、高校信息部门主管(Heigher Education Institute——ITManagers)  相似文献   

Synthetic and biological studies on a cyclopolypeptide of plant origin     

Dahiya R  Kumar A 《Journal of Zhejiang University. Science. B》2008,9(5):391-400

Objective: A natural cyclic peptide previously isolated from Citrus medica was synthesized by coupling oftetrapep-tide units Boc-Leu-Pro-Trp-Leu-Ome and Boc-Ile-Ala-Ala-Gly-Ome after proper deprotection at carboxyl and amino terminals followed by cyclization of linear octapeptide segment.Methods: Solution phase technique was adopted for the synthesis of cyclooctapeptide--sarcodactylamide.Required tetrapeptide units were prepared by coupling of Boc-protected dipeptides viz.Boc-Leu-Pro-OH and Boc-Ile-Ala-OH with respective dipeptide methyl esters Trp-Leu-Ome and Ala-Gly-Ome.Cyclization of linear octapeptide unit was done by p-nitrophenyl ester method.The structure of synthesized cyclopolypeptide was elucidated by FTIR,1H NMR,13C NMR,FABMS spectral data and elemental analysis.The newly synthesized peptide was evaluated for dif-ferent pharmacological activities including antimicrobial,anthelmintic and cytotoxic activities.Results: Synthesis of sarcodac-tylamide was accomplished with >78% yield utilizing dicyclohexylcarbodiimide (DCC) as coupling agent.Newly synthesized peptide possessed potent cytotoxic activity against Dalton's lymphoma ascites (DLA) and Ehrlich's ascites carcinoma (EAC) cell lines,in addition to moderate anthelmintic activity against earthworms Megascoplex konkanensis,Pontoscotex corethruses and Eudrilus sp.Moreover,cyclopolypeptide displayed good antimicrobial activity against pathogenic fungi Candida albicans and Gram-negative bacteria Pseudomonas aeruginosa,in comparison to standard drugs griseofulvin and ciprofloxacin.Conclusion: Solution phase technique employing DCC and triethylamine (TEA) as base proved to be effective for the synthesis of natural cyclooctapeptide.N-methyl morpholine (NMM) was found to be a better base for the cyclization of linear octapeptide unit in comparison to TEA and pyridine.  相似文献   

Developmental links of very early phonological and language skills to second grade reading outcomes: strong to accuracy but only minor to fluency     

Puolakanaho A  Ahonen T  Aro M  Eklund K  Leppänen PH  Poikkeus AM  Tolvanen A  Torppa M  Lyytinen H 《Journal of learning disabilities》2008,41(4):353-370

The authors examined second grade reading accuracy and fluency and their associations via letter knowledge to phonological and language predictors assessed at 3.5, 4.5, and 5.5 years in children in the Jyv?skyl? Longitudinal Study of Dyslexia. Structural equation modeling showed that a developmentally highly stable factor (early phonological and language processing [EPLP]) behind key dyslexia predictors (i.e., phonological awareness, short-term memory, rapid naming, vocabulary, and pseudoword repetition) could already be identified at 3.5 years. EPLP was significantly associated with reading and spelling accuracy and by age with letter knowledge. However, EPLP had only a minor link with reading fluency, which was additionally explained by early letter knowledge. The results show that reading accuracy is well predicted by early phonological and language skills. Variation in fluent reading skills is not well explained by early skills, suggesting factors other than phonological core skills. Future research is suggested to explore the factors behind the development of fast and accurate decoding skills.  相似文献   

The role of educators of the deaf in the early identification of hearing loss   总被引：1，自引：0，他引：1  

Arehart KH  Yoshinaga-Itano C 《American annals of the deaf》1999,144(1):19-23

About 16,000 babies each year will be identified with hearing loss by age 3 months once universal newborn hearing screening becomes a reality. Identification of hearing loss in infancy, followed by appropriate intervention by age 6 months, can result in normal language development, regardless of degree of hearing loss. As the average age of identification of hearing loss moves downward toward 2 months, children with hearing loss will enter the educational system earlier and with language skills commensurate with those of their hearing peers. In order to provide appropriate services to children with hearing loss and their families, early interventionists will need to forge links to health care providers involved in universal newborn hearing screening programs, to have specialized training in deafness and hearing loss, and to have expertise in providing services to very young children and to children with hearing loss in the broad range from mild to profound.  相似文献   

关于猫、黄金、老头和金字塔的三个不同故事     

崔志强  E.T  重重 《教学随笔》2002,(1)

两位考古专家一同前去参观金字塔,晚上便住在开罗市郊的一家小旅馆里,一个人留在房间里面写工作日记,另一个人就上街闲逛。他在路边发现有一个老妇人在卖一只黑色的工艺猫,要价1000元。他忽然发现这只猫的两只眼睛竟是两颗大  相似文献   

分层教学 三步到位——概括段意教学的新设想     

支克文 《湖北教育》1995,(4)

几年来,在概括段落大意教学中,始终存在着这样两个问题:一是教学要求和学生接受能力脱节;二是教育思想教学方法阻碍学生思维能力地发展。由此产生了如下现象:注重教师讲授,忽视学生自学;注重结论性教学模式,忽视分层教学的操作进程。  相似文献   

猫和两个麻雀     

拉·封丹 《中学生读写(初中)》2002,(8)

有一只猫,他和一个很年轻的麻雀同年出生,从小就跟他住在一起。鸟笼和猫篮都有同样的家神庇护着。猫往往和麻雀嬉戏:一个用嘴奋击,一个用爪相戏。可是猫总是饶恕他的朋友,只给他很轻的处罚:他不忍使用利爪,惟恐伤害  相似文献