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Results for DC.creator="A." AND DC.creator="C." AND DC.creator="T." AND DC.creator="North" in section 25.1.2 of volume F page 1 of 2 pages. |
Structure analysis at 6Å resolution
International Tables for Crystallography (2012). Vol. F, Section 25.1.2, pp. 845-854 [ doi:10.1107/97809553602060000899 ]
... been built in the laboratory to the design of D. A. G. Broad (patent 1956) under the direction of U. W. Arndt. We had a number of Buerger precession cameras and a Joyce-Loebl scanning densitometer, which had been used in ...
Phase determination at 6Å resolution
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.7, p. 852 [ doi:10.1107/97809553602060000899 ]
... were used to determine the phases of the protein reflections. A proportion of these phases were first determined by the graphical ... Kendrew et al., 1958). We treated the process as a group activity in which different individuals took responsibility for reading ... components [, , (calc) etc.] for each reflection in turn. This was a useful bonding exercise and improved our familiarity with the ...
Re-assessment of heavy-atom derivatives
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.6.4, pp. 851-852 [ doi:10.1107/97809553602060000899 ]
... which is now well known in protein-structure analysis, gives a modified Patterson of the heavy-atom structure in which the heavy-atom vectors appear at reduced weight in a complex background (Blow, 1958; Phillips, 1966). Nevertheless, the maps ... the heavy-atom parameters, that the mercury occupancy declined as a function of irradiation time. Consequently, the data from two ...
The absolute scale of the intensities
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.6.3, p. 851 [ doi:10.1107/97809553602060000899 ]
... measured intensities by comparison with the intensities diffracted by anthracene, a small organic crystal of known structure. This method had worked well in a determination of the absolute scale for seal myoglobin (Scouloudi, 1960), but it did not give a satisfactory result with lysozyme, mainly because of the difficulty ...
Data processing
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.6.2, pp. 850-851 [ doi:10.1107/97809553602060000899 ]
... reflections, hkl, were all printed out in plain language on a teleprinter and punched in paper tape for direct transfer to a computer (Fig. 25.1.2.7). The plain-language record was important ... at this stage, however, and ACTN's data-processing program (North, 1964) therefore incorporated systematic checks on the quality of ...
X-ray intensity measurements
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.6.1, pp. 848-850 [ doi:10.1107/97809553602060000899 ]
... the opportunity of measuring the protein reflections automatically and in a relatively short time compared with the other methods. Before he went on leave to MIT, ACTN had written a computer program for the University of London MERCURY computer to process the diffractometer data (North, 1964) and, on his return in September 1961, he ...
Analysis in three dimensions
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.6, pp. 848-852 [ doi:10.1107/97809553602060000899 ]
... the opportunity of measuring the protein reflections automatically and in a relatively short time compared with the other methods. Before he went on leave to MIT, ACTN had written a computer program for the University of London MERCURY computer to process the diffractometer data (North, 1964) and, on his return in September 1961, he ...
Refinement of heavy-atom parameters
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.5, p. 848 [ doi:10.1107/97809553602060000899 ]
Refinement of heavy-atom parameters 25.1.2.5. Refinement of heavy-atom parameters Refinement of the heavy-atom parameters was first performed by the use of Rollett's (1961) least-squares program on the MERCURY computer, using the values as structure amplitudes. This procedure gave satisfactory results for the K2HgI4, K2PdCl4 and MHTS ...
Other potential derivatives
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.4.4, pp. 847-848 [ doi:10.1107/97809553602060000899 ]
... compounds (Poljak, 1963), but none gave useful results. In particular, a uranyl derivative, obtained by the use of UO2NO3, gave difference ...
The o-mercurihydroxytoluene p-sulfonate (MHTS) derivative
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.4.3, p. 847 [ doi:10.1107/97809553602060000899 ]
... p-mercuribenzene sulfonate (PCMBS) derivative was interpretable in terms of a single site of substitution at 8Å resolution, but it was ... RJP and RHF then explored the usefulness of MHTS as a derivative. This compound had been specially synthesized by JWHO in the hope that a small rearrangement of groups present in PCMBS would lead ...
International Tables for Crystallography (2012). Vol. F, Section 25.1.2, pp. 845-854 [ doi:10.1107/97809553602060000899 ]
... been built in the laboratory to the design of D. A. G. Broad (patent 1956) under the direction of U. W. Arndt. We had a number of Buerger precession cameras and a Joyce-Loebl scanning densitometer, which had been used in ...
Phase determination at 6Å resolution
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.7, p. 852 [ doi:10.1107/97809553602060000899 ]
... were used to determine the phases of the protein reflections. A proportion of these phases were first determined by the graphical ... Kendrew et al., 1958). We treated the process as a group activity in which different individuals took responsibility for reading ... components [, , (calc) etc.] for each reflection in turn. This was a useful bonding exercise and improved our familiarity with the ...
Re-assessment of heavy-atom derivatives
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.6.4, pp. 851-852 [ doi:10.1107/97809553602060000899 ]
... which is now well known in protein-structure analysis, gives a modified Patterson of the heavy-atom structure in which the heavy-atom vectors appear at reduced weight in a complex background (Blow, 1958; Phillips, 1966). Nevertheless, the maps ... the heavy-atom parameters, that the mercury occupancy declined as a function of irradiation time. Consequently, the data from two ...
The absolute scale of the intensities
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.6.3, p. 851 [ doi:10.1107/97809553602060000899 ]
... measured intensities by comparison with the intensities diffracted by anthracene, a small organic crystal of known structure. This method had worked well in a determination of the absolute scale for seal myoglobin (Scouloudi, 1960), but it did not give a satisfactory result with lysozyme, mainly because of the difficulty ...
Data processing
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.6.2, pp. 850-851 [ doi:10.1107/97809553602060000899 ]
... reflections, hkl, were all printed out in plain language on a teleprinter and punched in paper tape for direct transfer to a computer (Fig. 25.1.2.7). The plain-language record was important ... at this stage, however, and ACTN's data-processing program (North, 1964) therefore incorporated systematic checks on the quality of ...
X-ray intensity measurements
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.6.1, pp. 848-850 [ doi:10.1107/97809553602060000899 ]
... the opportunity of measuring the protein reflections automatically and in a relatively short time compared with the other methods. Before he went on leave to MIT, ACTN had written a computer program for the University of London MERCURY computer to process the diffractometer data (North, 1964) and, on his return in September 1961, he ...
Analysis in three dimensions
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.6, pp. 848-852 [ doi:10.1107/97809553602060000899 ]
... the opportunity of measuring the protein reflections automatically and in a relatively short time compared with the other methods. Before he went on leave to MIT, ACTN had written a computer program for the University of London MERCURY computer to process the diffractometer data (North, 1964) and, on his return in September 1961, he ...
Refinement of heavy-atom parameters
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.5, p. 848 [ doi:10.1107/97809553602060000899 ]
Refinement of heavy-atom parameters 25.1.2.5. Refinement of heavy-atom parameters Refinement of the heavy-atom parameters was first performed by the use of Rollett's (1961) least-squares program on the MERCURY computer, using the values as structure amplitudes. This procedure gave satisfactory results for the K2HgI4, K2PdCl4 and MHTS ...
Other potential derivatives
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.4.4, pp. 847-848 [ doi:10.1107/97809553602060000899 ]
... compounds (Poljak, 1963), but none gave useful results. In particular, a uranyl derivative, obtained by the use of UO2NO3, gave difference ...
The o-mercurihydroxytoluene p-sulfonate (MHTS) derivative
International Tables for Crystallography (2012). Vol. F, Section 25.1.2.4.3, p. 847 [ doi:10.1107/97809553602060000899 ]
... p-mercuribenzene sulfonate (PCMBS) derivative was interpretable in terms of a single site of substitution at 8Å resolution, but it was ... RJP and RHF then explored the usefulness of MHTS as a derivative. This compound had been specially synthesized by JWHO in the hope that a small rearrangement of groups present in PCMBS would lead ...
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