不同生物合成氨基酸的能力不同,合成氨基酸的种类也有很大差异。 必需氨基酸:肌体维持正常生长所必需而又不能自己合成,需从外界获取的 氨基酸。 人和大白鼠需以下十种氨基酸(由大白鼠喂饲试验得来):Phe、Iys、Ie Leu、Met、Thr、Trp、Val、(His、Arg) 对于成人为前八种,对幼小动物为十种。 非必需氨基酸:肌体可以通过其他原料自己合成的氨基酸。 高等植物可以合成自己所需全部氨基酸。微生物合成氨基酸能力有很大差 距。 E coli可合成全部所需氨基酸,乳酸菌则不能合成全部

Proof Existence and uniqueness of r(t, u)and A(t)follow from Theorem 3. 1. Hence, in order to prove differentiability and the formula for the derivative, it is sufficient to show that there exist a function C: R++R+ such that C(r)/r-0 as r-0 and E>0 such

Definition A real-valued function V: X H R defined on state space X of a system with behavior set B and state r:B×[0,∞)→ X is called a Lyapunov function if tHv(t)=v(a(t))=v(a(z(), t)) is a non-increasing function of time for every z E B according to this definition, Lyapunov

2003年考研数学(四)真题评注 一、填空题(本题共6小题,每小题4分,满分2分把答案填在题中横线上) (1)极限lim[1+ln(1+x)]x=e2

自测试题一 一、填空 1、0.242、23、18.9:4、3;50.02286、e-3y0≤x≤3,y>0

reward l. reward sb. with sth.用某物报答酬谢/奖励某人 2. reward sb. for sth.因某事而报答酬谢奖励某人 3 rewarding adj. helpful有益的;值得做的e.g. Make the extra effort to impress theinterviewers and you will be likely to berewarded with a better job with a bettersalary.如果你能多花些心思,给面试的考官留下深刻的印象,那么你就可能得到一个比较好的、工资也很高的工作。次大注意区分与 award之间的不同

The signal suffers an attenuation loss l Received power PR= PT/L Received snr=E,/No, Eb=Pr/Rb Antennas are used to compensate for attenuation loss Capture as much of the signal as possible

McGraw-Hill Higher Education A Division of The McGraup-Hill Companies MODERN ANALYTICAL CHEMISTRY Copyright e 2000 by The McGraw-Hill Companies, Inc. All rights reserved. Printed in the United States of America. Except as permitted under the United States Copyright Act of 976, no part of this publicatio

令表示实数域R或复数域,H,及E表示上的 Hilbert空间.不同 Hilbert空间中的内积和范数统一用及 表示.我们约定内积(x,y)关于x线性、关于y共轭线性 如不特别指明数域巩或￠,所有结果同时适用于两种情形

2003年考研数学(四)真题评注 一、填空题(本题共6小题,每小题4分,满分24分.把答案填在题中横线上) (1)极限lim[+ln(1+x)x=e2