scholarly journals Infrared spectrum of the cold ortho-fluorinated protonated neurotransmitter 2-phenylethylamine: competition between NH+⋯π and NH+⋯F interactions

2016 ◽  
Vol 18 (38) ◽  
pp. 26980-26989 ◽  
Author(s):  
Markus Schütz ◽  
Aude Bouchet ◽  
Otto Dopfer
Keyword(s):  
Infrared Spectrum ◽  
Ir Spectra ◽  
Side Chain ◽  
Rare Gas ◽  
Site Specific

IR spectra of cold rare-gas tagged ions reveal the switch of the preferred conformation of the highly flexible side chain of a prototypical protonated neurotransmitter induced by site-specific aromatic fluorination.

New Algorithm for Engine Oil Identification by Infrared Spectrum

2014 ◽  
Vol 1081 ◽  
pp. 353-357
Author(s):  
Yong Gang Shi ◽  
Hao Wen ◽  
Hai Feng Gong ◽  
Zi Cun Li ◽  
Bin Su ◽  
...  
Keyword(s):  
Infrared Spectrum ◽  
Ir Spectra ◽  
Quality Index ◽  
Experimental Results ◽  
Engine Oil ◽  
Evaluation Index ◽  
Weight Factor ◽  
Engine Oils ◽  
Composition Characteristics

Based on structure and composition characteristics of engine oil, the new algorithm for its Infrared Spectrum (IR) Identification has been put forward. The Hit Quality Index and Related Hit Quality Index are widely used in Infrared Spectrum Identification recently. The two methods don’t take the importance of the variables into consideration and cannot distinguish the unobvious variation in IR spectra. Therefore the diversity weight factor was introduced into the new algorithm to promote its selectivity. The experimental results had shown that the new spectrum similarity evaluation index could distinguish the unobvious spectrum variations and to improve the infrared spectrum identification capability of engine oils.

Spectroscopy and dynamics of rare gas–spherical top complexes. The infrared spectrum of the ν3band of argon–silane

1994 ◽  
Vol 100 (10) ◽  
pp. 7051-7060 ◽  
Author(s):  
Robert W. Randall ◽  
Jonathan B. Ibbotson ◽  
Brian J. Howard
Keyword(s):  
Infrared Spectrum ◽  
Rare Gas

scholarly journals Glycosylation of CD44 is implicated in CD44-mediated cell adhesion to hyaluronan.

1996 ◽  
Vol 132 (6) ◽  
pp. 1199-1208 ◽  
Author(s):  
A Bartolazzi ◽  
A Nocks ◽  
A Aruffo ◽  
F Spring ◽  
I Stamenkovic
Keyword(s):  
Cell Adhesion ◽  
Regulatory Mechanism ◽  
Cell Attachment ◽  
Glycosylation Site ◽  
Side Chain ◽  
Site Specific ◽  
Coated Substrate ◽  
Glycosylation Sites ◽  
Coated Surfaces

CD44-mediated cell adhesion to hyaluronate is controlled by mechanisms which are poorly understood. In the present work we examine the role of N-linked glycosylation and Ser-Gly motifs in regulating CD44-hyaluronate interaction. Our results show that treatment of a panel of human cell lines which constitutively express CD44 with the inhibitor of N-linked glycosylation tunicamycin results in the loss of attachment of these cells to hyaluronate-coated substrate. In contrast, treatment of the same cells with deoxymannojirimycin, which inhibits the conversion of high mannose oligosaccharides to complex N-linked carbohydrates, results in either no change or an increase in CD44-mediated adhesion to hyaluronate, suggesting that complex N-linked oligosaccharides may not be required for and may even inhibit CD44-HA interaction. Using human melanoma cells stably transfected with CD44 N-linked glycosylation site-specific mutants, we show that integrity of five potential N-linked glycosylation sites within the hyaluronate recognition domain of CD44 is critical for hyaluronate binding. Mutation of any one of these potential N-linked glycosylation sites abrogates CD44-mediated melanoma cell attachment to hyaluronate-coated surfaces, suggesting that all five sites are necessary to maintain the HA-recognition domain in the appropriate conformation. We also demonstrate that mutation of serine residues which constitute the four Ser-Gly motifs in the membrane proximal domain, and provide potential sites for glycosaminoglycan side chain attachment, impairs hyaluronate binding. Taken together, these observations indicate that changes in glycosylation of CD44 can have profound effects on its interaction with hyaluronic acid and suggest that glycosylation may provide an important regulatory mechanism of CD44 function.

Das Infrarotspektrum von matrixisoliertem SFCl / Infrared Spectrum of Matrix Isolated SFCl

1984 ◽  
Vol 39 (3) ◽  
pp. 314-316 ◽  
Author(s):  
Helge Willner
Keyword(s):  
Infrared Spectrum ◽  
Gas Phase ◽  
Force Constants ◽  
Rare Gas ◽  
Isotopic Substitution ◽  
Uv Photolysis ◽  
Molecular Identity

The new compound SFCl was obtained by UV photolysis of FC(O)SCl in rare gas matrix and by UV photolysis of Cl2/SF3SF in the gas phase. Isotopic substitution verifies the molecular identity. Eight frequencies from three isotropic molecules determine the force constants fSF = 4.30 and fscl = 2.90 102N/m.

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