Stereoselective Synthesis of the Core of Naturally Occurring anti-HIV Isolitseane B.

ChemInform ◽  
2007 ◽  
Vol 38 (52) ◽  
Author(s):  
Paul Bremond ◽  
Elodie Girardeau ◽  
Yoann Coquerel ◽  
Jean Rodriguez
2007 ◽  
Vol 4 (4) ◽  
pp. 232-233 ◽  
Author(s):  
Paul Bremond ◽  
Elodie Girardeau ◽  
Yoann Coquerel ◽  
Jean Rodriguez

2020 ◽  
pp. 004051752092551
Author(s):  
Javeed A Awan ◽  
Saif Ur Rehman ◽  
Muhammad Kashif Bangash ◽  
Fiaz Hussain ◽  
Jean-Noël Jaubert

Curcumin is a naturally occurring hydrophobic polyphenol compound. It exhibits a wide range of biological activities such as antibacterial, anti-inflammatory, anti-carcinogenic, antifungal, anti-HIV, and antimicrobial activity. In this research work, antimicrobial curcumin nanofibrous membranes are produce by an electrospinning technique using the Eudragit RS 100 (C19H34ClNO6) polymer solution enriched with curcumin. The morphology and chemistry of the membrane are analyzed using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. Kirby Bauer disk diffusion tests are carried out to examine the antibacterial effectiveness of the membrane. Experimental results show that the nanofibers produced are of uniform thickness morphology and curcumin is successfully incorporated into the nanofibrous mat, while no chemical bonding was observed between curcumin and the polymer. The antimicrobial curcumin nanofibrous membranes can be effectively applied as antimicrobial barrier in a wide variety of medical applications such as wound healing, scaffolds, and tissue engineering.


2013 ◽  
Vol 10 (2) ◽  
pp. 203-210
Author(s):  
Irina Sekerina

The central goal of the heritage language (HL) curriculum is to facilitate ultimate attainment of the language by advanced speakers. However, the field of HL studies faces a problem in how to accurately and efficiently identify and measure weaknesses and strengths of advanced HL speakers on their way to ultimate attainment. So far, only the age of arrival to the country where the dominant language is spoken has been formally investigated as the most critical factor that influences full professional proficiency and ultimate attainment of the HL. The field of HL studies needs to embrace a formal psychometric approach that will allow us to go beyond the effect of age of arrival to uncover contributions of other naturally occurring factors, i.e., genetic, physiological, cognitive, developmental and environmental. At the core of this approach lies a comprehensive standardized assessment of (a) proficiency in HL and (b) general cognitive abilities.


Virology ◽  
2007 ◽  
Vol 365 (2) ◽  
pp. 285-291 ◽  
Author(s):  
Masaya Sugiyama ◽  
Yasuhito Tanaka ◽  
Fuat Kurbanov ◽  
Nobuaki Nakayama ◽  
Satoshi Mochida ◽  
...  

2020 ◽  
Vol 18 (24) ◽  
pp. 4566-4568
Author(s):  
Gints Smits ◽  
Ronalds Zemribo

The core structure of eleganine A – a cytotoxic indole monoterpene alkaloid – was accessed for the first time.


1994 ◽  
Vol 72 (6) ◽  
pp. 1447-1465 ◽  
Author(s):  
Frank Barresi ◽  
Ole Hindsgaul

The synthesis of β-mannopyranosides by intramolecular aglycon delivery is shown to proceed with complete stereoselectivity in six separate cases. This strategy has been successfully applied to the synthesis of several disaccharides, including octyl 3,6-di-O-benzyl-4-O-(3,4,6-tri-O-benzyl-β-D-mannopyranosyl)-2-deoxy-2-phthalimido-β-D-glucopyranoside, a precursor of the naturally occurring β-D-Man-(1→4)-β-D-GlcNAc linkage, present in all N-linked glycoproteins. Exclusive formation of the β-mannosidic linkage has been confirmed in all six cases, since independently synthesized α-linked mannopyranoside standards were shown to be absent from the reaction products. The intramolecular stereocontrolled reaction proceeds even in the presence of competing methanol. The extension of this strategy to the synthesis of the core pentasaccharide of N-linked glycoproteins has revealed limitations to the methodology, especially when a block synthesis approach is investigated.


2011 ◽  
Vol 65 (4) ◽  
Author(s):  
Miroslava Martinková ◽  
Jozef Gonda ◽  
Alena Uhríková ◽  
Margaréta Kováčvá

Abstract5-O-(t-Butyldimethylsilyl)-3-deoxy-3-C-hydroxymethyl-1,2-O-isopropylidene-3-(methoxycarbonylamino)-α-d-xylofuranose IV has been proved to be an appropriate building block in the stereoselective synthesis of methyl (4S)-4-[(1′R)-1′-acetoxy-4′-oxobutyl]-3-benzyl-2-oxooxazolidine-4-carboxylate III representing the polar part of the naturally occurring mycestericins E and mycestericins G.


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