生物文章---《分析人类的形成》

suansmdx 2009-01-16 01:42:49 433 浏览

人种是怎么形成的，写一篇关于人类形成的文章！！！那位大哥帮忙写一下，小弟就此谢过！！！... 人种是怎么形成的，写一篇关于人类形成的文章！！！那位大哥帮忙写一下，小弟就此谢过！！！展开

参与评论

登录后参与评论

全部评论(0条)

热门问答

生物文章---《分析人类的形成》: 人种是怎么形成的，写一篇关于人类形成的文章！！！那位大哥帮忙写一下，小弟就此谢过！！！... 人种是怎么形成的，写一篇关于人类形成的文章！！！那位大哥帮忙写一下，小弟就此谢过！！！展开

人类有哪些生物老师:

麻烦帮我翻译以下文章(生物专业英语): The most common means of agitation of liquid media is by placing the culture vessels on a drum(for test tubes)or a disk(for flasks)slowly rotating around a near horizontal axis. This assures good aeration of the liquid cultures with little... The most common means of agitation of liquid media is by placing the culture vessels on a drum(for test tubes)or a disk(for flasks)slowly rotating around a near horizontal axis. This assures good aeration of the liquid cultures with little mechanical damage to the cells.Agitation can also be achieved by placing culture flasks on reciprocating or gyrotory platform shakers.Gyrotoy (horizontal rotary orbit)shakers are preferred over reciprocating (horizontal linear motion)ones for a variety of reasons .The performance of the gyrotory shaker is determined by the speed of agitation and angle position of the flasks，with optimal aeration occurring in flasks tilted about 45° from the vertical.A new shaker design is the "tapping" motion shaker in which the culture is agitated by a magnetic bar moving up and down.This vertical movement of the bar is less injurious to cells than rotary movement of the bar at the bottom of the flask used in some conventional culture systems. 展开

哪些人类以生物为“老师”的事例:

人类根具生物发明了什么东西?: 对生活有帮助或者是交通工具... 对生活有帮助或者是交通工具展开

人类有哪些生物"老师":

人类染色体核型分析的主要依据是什么?:

有哪些生物是人类的老师举个例子说明:

人类以生物为“老师”的事例呢？还有那些？:

文章继续求翻译1，生物/英语达人来帮忙！: Residues of malachite green (MG) were extracted from homogenized animal tissues with a mixture of McIlvaine buffer (pH 3.0)–acetonitrile， and purified over an aromatic sulfonic acid solid-phase extraction column followed by ... Residues of malachite green (MG) were extracted from homogenized animal tissues with a mixture of McIlvaine buffer (pH 3.0)–acetonitrile， and purified over an aromatic sulfonic acid solid-phase extraction column followed by HPLC or LC–ESI-MS–MS analysis. Ascorbic acid and N，N，N9，N9-tetramethyl-1，4-phenylenediamine dihydrochloride were added to reduce de-methylation of the dye. Responses were recorded at 620 nm (HPLC) or by multiple-reaction-monitoring (LC–MS–MS) after post-column oxidation using PbO2 . MG and its primary metabolite leuco-malachite green (LMG) were successfully determined at 2.5–2000 mg / kg in catfish， eel， rainbow trout， salmon， tropical prawns and turbot， with a limit of detection at 1 mg / kg (HPLC) and 0.2 mg / kg (LC–MS–MS) for both MG and LMG. Recoveries for LMG were between 86±15% (prawn) and 105±14% (eel). Freeze–thawing cycles， and storage at 4°C and -20°C affected the recovery of both MG and LMG. Analyses of eel， trout and (processed) salmon field samples collected at local retailers， fish-market and -shops demonstrated trace levels of MG-residues. A McIlvaine solution at pH 3.0 was prepared by mixing 18.9 ml 0.2 M sodium hydrogen phosphate and 81.1 ml 0.1 M citric acid， whereas these volumes were 62.5 and 37.5 ml， respectively， to obtain a McIlvaine solution at pH 6.0. The SPE-eluent was prepared just before use and consisted of a mixture of 2.5 ml 25% (m/v) ammonium hydroxide， 2.5 ml 1.0 mg/ml methanolic ascorbic acid and 45 ml methanol. The sample-solvent was composed， just before use， from 2.5 ml 1.0 mg/ml methanolic ascorbic acid， 20 ml 50 mM sodium perchlorate containing 25 mM sodium acetate and 25 mM 1-pentanesulfonic acid adjusted to pH 4.0 with acetic acid， and 27.5 ml acetonitrile. Chemicals and solutions containing the dyes were protected from light. Fish were bought at the fish market and local stores. Blank trout were collected from aquaria at Utrecht University (The Netherlands). Tropical prawns were collected by the Dutch Inspectorate for Health Protection and Veterinary Public Health. 展开