## Abstract A previously described procedure for simultaneous optimization of bond lengths and angles was used to test different models for mannan I. Potential hydrogen bonds and the glycosidic angle were included in the optimization. A conformational model with bifurcated intramolecular hydrogen b
Crystalline structure and packing of mannan I
β Scribed by E. D. T. Atkins; Sheila Farnell; C. Burden; W. Mackie; B. Sheldrick
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1988
- Tongue
- English
- Weight
- 508 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0006-3525
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β¦ Synopsis
The x-ray fiber diffraction pattern of the mannan I polymorph has been reexamined using the linked atom least squares (LALS) model-building program. The chain conformation and packing were refined using atomic coordinates derived from the x-ray crystallographic structure of mannotrime. The study confirmed the conclusions of previous investigations and showed that, in mannan I, the chains are antiparallel. Mannan polymorphism is compared with other related polysaccharides and the biological significance of this result in relation to the biosynthesis of mannan is discussed.
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## Abstract **Summary:** Liquid crystalline oligomers of 9,9βbis(2βethylhexyl)fluorene of defined degree of polymerization 4, 5, 6, and 7 were investigated by Xβray diffraction in the nonβoriented and in the aligned state. The diffraction data give evidence for a smectic B type phase for all of the
1.327(12) C( I)-C( IB) C( 1 B)-N( I) 1.392( 13) C(1B)-C( 1A) l.492( 13) C( 1 A)-O( 1 B) C(1A)-C(1C) 1.537(13) O(1B)-C( 11) 1.300(11) C(2)-0(2) ~( 2 ) -~( 3 ) 1.336(11) C(2)-C(2A) 1.497( 14) C(2A)-N(2) C(3)-0(3) 1.212(11) C(3)-N(4) 1.341( 13) C(3)-C(3A) C(3A)-N(3) 1.452( 12) C(4)-0(4) 1.224( 10) C(4)
## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a βFull Textβ option. The original article is trackable v