※ 引述《[email protected] (多少心思转成梦)》之铭言： > 1. Determine “True” or “False” for the following statements: > (a) 12C has no spin, so it can not have NMR signal -->Ture > (b) The spin of 13C is the same as that of 1H -->Ture > (c) 13C is radioactive, but 14C is not. -->False > (d) Natural proteins contain 19F. -->False > (e) 15N has spin and is radioactive. -->False > (f) 14N has spin, but its relaxation behavior is very fast & thus > is not very useful for NMR study. -->Ture (a) Nucleus spins if it is odd mass or/and odd atomic number  Nuclear do not spin if it is even mass and even atomic number (b) Nuclear spin quatum number of 1H = 13C = 1/2 (c) 13C is radioinactive, but 14C is. (d) No amino acid contain F. (e) 15n has spin but is radioinactive. (f) Number of spin states of 14N = 3 就我所知是这样，欢迎大家讨论 > 2. Describe what you know about the 脉-helix. > 3. Describe what you know about the 刍-sheet > 4. Describe the difference(s) between protein engineering and protein design > 5. What is the protein folding problem? > 谁能帮我解答 谢谢~ -- 绝望之为虚幻 正与希望相同 -- ◢◣ ︵︵ █▔◣ █▔█ █▔▔ █▔█ █▆▉ █ █▔█ █◣█ █▔● ◢◤█◣◢◣ ︵︵ █ █ █▁◤ █▁▁ █▁█ ▉▉▉ █ █▁█ █◥█ █ █ 梦之大地 逼逼ㄟ四 █▁◤ █ █ █▁▁ █ █ ▉▉▉ █▁ █ █ █ █ █▁◤ ※ Origin: <bbs.ccns.ncku.edu.tw> ◆ From: 140.116.94.251