نتایج جستجو برای: crystal form

تعداد نتایج: 837146  

Journal: :Biochemistry 1998
I Baikalov I Schröder M Kaczor-Grzeskowiak D Cascio R P Gunsalus R E Dickerson

The structure of the Escherichia coli response regulator NarL has been solved in a new, monoclinic space group, and compared with the earlier orthorhombic crystal structure. Because the monoclinic crystal has two independent NarL molecules per asymmetric unit, we now have three completely independent snapshots of the NarL molecule: two from the monoclinic form and one from the orthorhombic. Com...

Journal: :Journal of pharmacy & pharmaceutical sciences : a publication of the Canadian Society for Pharmaceutical Sciences, Societe canadienne des sciences pharmaceutiques 2006
Matthew L Peterson Magali B Hickey Michael J Zaworotko Orn Almarsson

The commentary seeks to provide a brief history and perspective on the importance of crystal forms of pharmaceuticals as a means of achieving performance criteria. The expanding scope of crystal form selection, emergence of crystal engineering in pharmaceutical science and pharmaceutical co-crystals are topics of this brief review.

2014
S. Sathya D. Reuben Jonathan K. Prathebha J. Jovita G. Usha

In the title compound, C23H18O4, the meth-oxy-benzene ring and attached C=C grouping are disordered over two sets of sites in a 0.823 (5):0.177 (5) ratio. The dihedral angles between the central benzene ring and the pendant phenyl and meth-oxy-benzene ring (major orientation) are 51.21 (1) and 51.6 (1)°, respectively. In the crystal, inversion dimers linked by pairs of C-H⋯O hydrogen bonds gene...

2014
Wang Yu Jingbao Song Aijian Wang

In the title compound, C24H22Br2N2S, the dihedral angles between the central pyrimidine ring and the pendant bromo-benzene rings are 11.02 (11) and 13.20 (12)°. The butyl side chain adopts a gauche conformation [C-C-C-C = -67.4 (4)°]. In the crystal, weak aromatic π-π stacking is observed between the pyrimidine ring and one of the benzene rings [centroid-centroid separation = 3.6718 (17) Å].

Journal: :Acta crystallographica. Section D, Biological crystallography 1997
C E McVey S P Tolley S H Done J A Brannigan K S Wilson

A new crystal form of penicillin acylase (penicillin amidohydrolase, E.C. 3.5.1.11) from Escherichia coli W (ATCC 11105) is reported. The crystals were grown using a combination of hanging-drop and streak-seeding methods. The crystals are in the monoclinic space group P2(1) with cell dimensions a = 51.52, b = 131.95, c = 64.43 A, beta = 106.12 degrees. There is one heterodimer in the asymmetric...

Journal: :International journal of biochemistry and molecular biology 2011
Jing-Yuan Liu Thomas D Hurley

Thiamin pyrophosphokinase (TPK) transfers a pyrophosphate group from ATP to the hydroxyl group of thiamin and produces thiamin pyrophosphate (TPP). TPP is the cofactor of metabolically important enzymes such as pyruvate dehydrogenase, α-ketoglutarate dehydrogenase, branched-chain α-keto acid dehydrogenase, transketolase and 2-hydroxyphytanoyl-CoA lyase. Thiamin deficiency results in Wernike-Kor...

Journal: :Nanoscale 2016
Sepideh Gorji Ghalamestani Sebastian Lehmann Kimberly A Dick

The epitaxial growth of antimonide-based nanowires has become an attractive subject due to their interesting properties required for various applications such as long-wavelength IR detectors. The studies conducted on antimonide-based nanowires indicate that they preferentially crystallize in the zinc blende (ZB) crystal structure rather than wurtzite (WZ), which is common in other III-V nanowir...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده ادبیات و علوم انسانی 1392

abstract the present study was conducted in order to investigate the impact of an integrated model of form-focused and task-based instruction on iranian efl learners vocabulary learning and retention.it also aimed to detect efl learners attitude towards the implementation of form-focused task-based vocabulary instruction in the classroom. in order to address the purposes of this study, a sampl...

2016
P. P. Upadhyay M. K. Mishra U. Ramamurty A. D. Bond

Famotidine Form B P. P. Upadhyay, M. K. Mishra, U. Ramamurty, A. D. Bond University of Copenhagen, Indian Institute of Science, University of Cambridge Purpose Polymorphs are well known to have different mechanical properties. Nanoindentation enables mechanical properties to be tested on single crystals, which should provide the best opportunity to establish a correlation with single-crystal X-...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2005
Franklin A Hays Amy Teegarden Zebulon J R Jones Michael Harms Dustin Raup Jeffrey Watson Emily Cavaliere P Shing Ho

The fundamental question of how sequence defines conformation is explicitly answered if the structures of all possible sequences of a macromolecule are determined. We present here a crystallographic screen of all permutations of the inverted repeat DNA sequence d(CCnnnN6N7N8GG), where N6, N7, and N8 are any of the four naturally occurring nucleotides. At this point, 63 of the 64 possible permut...

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