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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!
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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
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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
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lyl163com

金虫 (正式写手)

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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
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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
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