24小时热门版块排行榜    

查看: 1618  |  回复: 9
当前只显示满足指定条件的回帖,点击这里查看本话题的所有回帖

hongyanxu

木虫 (著名写手)

[求助] 急急急!完整度低怎么解决?

Alert level A
    PLAT029_ALERT_3_A _diffrn_measured_fraction_theta_full Low .......       0.93      

各位大侠,怎么解决这个完整度低的问题呢?
多谢!
回复此楼

» 收录本帖的淘帖专辑推荐

晶体解析相关

» 猜你喜欢

» 本主题相关价值贴推荐,对您同样有帮助:

在路上路过
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

xi2004

至尊木虫 (职业作家)

【答案】应助回帖

引用回帖:
Originally posted by zou-yanhua at 2011-05-11 11:01:41:
您好。请问如果这个命令omit 52与omit -2 52区别在哪?-2指的是什么?
不胜感激

参见Shelx说明书

OMIT  s[-2]  2(lim)[180]
If s is given as negative, all reflections with Fo2 < 0.5s(Fo2) are replaced by 0.5s(Fo2); thus if no OMIT instruction is given the default action is to replace all Fo2 values less than -(Fo2) by  -(Fo2).  If s is positive it is interpretated as a threshold for flagging reflections as 'unobserved'.   Unobserved data are not used for least-squares refinement or Fourier calculations, but are retained for the calculation of R-indices based on all data, and may also appear (flagged with an asterisk) in the list of reflections for which Fo2 and Fc2 disagree significantly. Internally in the program s is halved and applied to Fo2, so for positive Fo2 the test is roughly equivalent to suppressing all reflections with Fo < s (Fo), as required for consistency with SHELX-76.  Note that s may be set to 0 or (as in the default setting) to a negative threshold (to modify very negative Fo2). An OMIT instruction with a positive s value is NOT ALLOWED in combination with ACTA, because it may introduce a bias in the final refined parameters; individual aberrant reflections may still be suppressed using OMIT h k l, even when ACTA is used.

2(lim) defines a limiting 2 above which reflections are totally ignored; they are rejected immediately on reading in.  This facility may be used to save computer time in the early stages of structure refinement, and is also sometimes useful for macromolecules.  The SHEL command may also be used to ignore reflections above or below particular limiting resolution values.

OMIT followed by atom names but no numbers may be used to calculate an 'omit map' and is described in the section 'Atom Lists ...'.
xi2004-emuch@163.com
9楼2011-05-11 11:09:49
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 10 个回答

lyl163com

金虫 (正式写手)

【答案】应助回帖


hongyanxu(金币+2): 2011-05-02 10:47:10
帝夫(金币+1): 感谢您的回复!欢迎常来晶体版指导交流~ 2011-05-04 10:51:23
引用回帖:
Originally posted by hongyanxu at 2011-04-26 22:10:08:
Alert level A
    PLAT029_ALERT_3_A _diffrn_measured_fraction_theta_full Low .......       0.93      

各位大侠,怎么解决这个完整度低的问题呢?
多谢!

删除坏点,限制角度,做吸收校正,如果还是不行的话就重新培养晶体重新收集数据。完整度低往往晶体的质量差造成的!
2楼2011-04-26 22:27:36
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

lyl163com

金虫 (正式写手)

【答案】应助回帖

hongyanxu(金币+2): omit -3 50.54 是什么意思,找到这个点吗?都有这个点吗? 2011-04-27 08:20:52
引用回帖:
Originally posted by lyl163com at 2011-04-26 22:27:36:
删除坏点,限制角度,做吸收校正,如果还是不行的话就重新培养晶体重新收集数据。完整度低往往晶体的质量差造成的!

omit  h  k  l  (h,k,l表示坏点)

omit -3 50.54
3楼2011-04-26 22:30:29
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

yanhualover

荣誉版主 (职业作家)

我是花木虫

★ ★
帝夫(金币+2): 感谢您的回复!欢迎常来晶体版指导交流~ 2011-05-04 10:52:04
1. OMIT -3 50 (这个有可能使完整度达到95%以上)
2. 重新收录数据(注意:增加高角度收集的数量)
3. 重新培养晶体(最后的办法了)
人生苦短,秉烛夜游
4楼2011-04-26 22:31:19
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 材料专硕306英一数二 +4 z1z2z3879 2026-03-16 6/300 2026-03-16 19:38 by z1z2z3879
[基金申请] 今年的国基金是打分制吗? 50+3 zhanghaozhu 2026-03-14 3/150 2026-03-16 17:07 by 北京莱茵润色
[考研] 一志愿苏州大学材料工程(085601)专硕有科研经历三项国奖两个实用型专利一项省级立项 +3 大火山小火山 2026-03-16 5/250 2026-03-16 16:54 by barlinike
[考研] 一志愿华中师范071000,325求调剂 +6 RuitingC 2026-03-12 6/300 2026-03-16 14:50 by 可淡不可忘
[考博] 欢迎申博同学联系 +3 天道酬勤2026686 2026-03-10 7/350 2026-03-15 19:03 by 天道酬勤2026686
[基金申请] 面上和青基一样限30页不合理 +5 wowsunflower 2026-03-10 7/350 2026-03-14 17:21 by kingkocxr
[考研] 267一志愿南京工业大学0817化工求调剂 +5 SUICHILD 2026-03-12 5/250 2026-03-14 14:53 by jean5056
[考研] 308 085701 四六级已过求调剂 +7 温乔乔乔乔 2026-03-12 14/700 2026-03-14 10:49 by JourneyLucky
[考研] 307求调剂 +7 超级伊昂大王 2026-03-10 7/350 2026-03-14 00:49 by JourneyLucky
[考研] 求调剂,一志愿江南大学环境工程085701 +3 Djdjj12 2026-03-10 4/200 2026-03-14 00:31 by JourneyLucky
[考研] 材料与化工(0856)304求B区调剂 +6 邱gl 2026-03-12 7/350 2026-03-13 23:24 by 邱gl
[考研] 材料与化工求调剂一志愿 985 总分 295 +8 dream…… 2026-03-12 8/400 2026-03-13 22:17 by 星空星月
[考研] 290求调剂 +9 ADT 2026-03-11 9/450 2026-03-13 21:55 by JourneyLucky
[考研] 材料301分求调剂 +5 Liyouyumairs 2026-03-12 5/250 2026-03-13 14:42 by JourneyLucky
[论文投稿] 投稿问题 5+4 星光灿烂xt 2026-03-12 6/300 2026-03-13 14:17 by god_tian
[考研] 274求调剂0856材料化工 +12 z2839474511 2026-03-11 13/650 2026-03-13 10:39 by peike
[考研] 283求调剂,材料、化工皆可 +8 苏打水7777 2026-03-11 10/500 2026-03-13 09:06 by Linda Hu
[考研] 333求调剂 +3 152697 2026-03-12 4/200 2026-03-13 07:08 by Iveryant
[考研] 大连大学化学专业研究生调剂 +3 琪久. 2026-03-10 8/400 2026-03-11 10:02 by 琪久.
[考博] 26申博求助 +3 跳跃饼干 2026-03-10 4/200 2026-03-10 21:15 by Tntcnn
信息提示
请填处理意见