نتایج جستجو برای: donor d

تعداد نتایج: 640397  

Journal: :Angewandte Chemie 2012
Keisuke Yamamoto Benjamin G Davis

Glycosynthases provide a rare and practical source of catalytic synthetic utility for oligosaccharide and other glycoside synthesis. These biocatalysts, nucleophile-less mutants of retaining glycosidases, are typically exquisitely stereoselective (inverting) enzymes and some can also attach monosaccharides with good regioselectivity. Many examples now exist, but in most cases b-glycosides are s...

Journal: :Monthly Notices of the Royal Astronomical Society 2023

ABSTRACT White dwarfs that accrete from non-degenerate companions show anomalous carbon and nitrogen abundances in the photospheres of their stellar components have been postulated to be descendants supersoft X-ray binaries. Measuring carbon-to-nitrogen abundance ratio may provide constraints on past evolution. We fit far-ultraviolet spectroscopy cataclysmic variable HS 0218 + 3229 taken with C...

Journal: :Molbank 2022

Donor molecules of the D-π-A-π-D type structure are often used for applications in organic photovoltaics. In this communication, bromination 4,7-di(thiophen-2-yl)-[1,2,5]thiadiazolo[3,4-d]pyridazine followed by Suzuki cross-coupling with carbazoleboronic acid gave 4,7-bis( 5-(9-hexyl-9H-carbazol-3-yl)thiophen-2-yl)-[1,2,5]thiadiazolo[3,4-d]pyridazine. The newly synthesized compounds was establi...

Journal: :The Journal of organic chemistry 2011
Ravindra T Dere Amit Kumar Vipin Kumar Xiangming Zhu Richard R Schmidt

The acid-catalyzed reaction of 1,2-anhydro-3,4,6-tri-O-benzyl-α-d-glucopyranose (7) as glycosyl donor with bis-trimethylsilyl sulfide as acceptor affords the α-thiol. Hence, this sterically hindered S-nucleophile as acceptor should provide with O-glycosyl trichloroacetimidates as glycosyl donors that have nonparticipating groups at C-2, glycosylthiols with the thiol group in axial position. Thi...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1998
J Jortner M Bixon T Langenbacher M E Michel-Beyerle

We explore charge migration in DNA, advancing two distinct mechanisms of charge separation in a donor (d)-bridge ([Bj])-acceptor (a) system, where [Bj] = B1,B2, . , BN are the N-specific adjacent bases of B-DNA: (i) two-center unistep superexchange induced charge transfer, d*[Bj]a --> d[Bj]a+/-, and (ii) multistep charge transport involves charge injection from d* (or d+) to [Bj], charge hoppin...

Journal: :بینا 0
سپهر فیضی s feizi ophthalmic research center, shahid beheshti university of medical sciences, tehran, iranدانشگاه علوم پزشکی شهید بهشتی محمدعلی جوادی ma javadi ophthalmic research center, shahid beheshti university of medical sciences, tehran, iranدانشگاه علوم پزشکی شهید بهشتی فرید کریمیان f karimian ophthalmic research center, shahid beheshti university of medical sciences, tehran, iranدانشگاه علوم پزشکی شهید بهشتی کاملیا شهابی c shahabi ophthalmic research center, shahid beheshti university of medical sciences, tehran, iranدانشگاه علوم پزشکی شهید بهشتی نازلی طاهری n taheri ophthalmic research center, shahid beheshti university of medical sciences, tehran, iranدانشگاه علوم پزشکی شهید بهشتی

deep anterior lamellar keratoplasty (dalk) has recently been introduced as an alternative procedure to penetrating keratoplasty (pk) for corneal pathologies not affecting the corneal endothelium. dalk does not rely on donor endothelium and requires less rigid criteria for donor corneal tissue quality. therefore, dalk makes it possible to use donor corneas deemed unsuitable for pk. furthermore, ...

Journal: :Chemical communications 2010
Hong-Bo Wang Bhanu P Mudraboyina Jiaxin Li James A Wisner

Molecular strands incorporating three hydrogen bond donor (D) or acceptor (A) heterocycles form highly stable double helical complexes through a complementary AAA-DDD array structure.

Journal: :بینا 0
سپهر فیضی s feizi ophthalmic research center, shahid beheshti university of medical sciences, tehran, iranدانشگاه علوم پزشکی شهید بهشتی محمدعلی جوادی ma javadi ophthalmic research center, shahid beheshti university of medical sciences, tehran, iranدانشگاه علوم پزشکی شهید بهشتی مژگان رضایی کنوی m rezaie kanavi ophthalmic research center, shahid beheshti university of medical sciences, tehran, iranمرکز تحقیقات مهندسی بافت چشم- دانشگاه علوم پزشکی شهید بهشتی فاطمه جوادی f javadi

purpose: to evaluate the influence of donor characteristics (age, death-to-preservation time, preservation-to-surgery time, graft rating, and endothelial cell features) on clinical outcomes following deep anterior lamellar keratoplasty (dalk) in patients with keratoconus. methods: in this retrospective study, 290 consecutive keratoconic eyes underwent dalk using donor corneas of different quali...

Journal: :بینا 0
علیرضا فروتن froutan تهران- خیابان نیایش- بیمارستان حضرت رسول اکرم (ص)- مرکز تحقیقات چشم محمود جوشقانی joshaghani تهران- خیابان نیایش- بیمارستان حضرت رسول اکرم (ص)- مرکز تحقیقات چشم منصور میرصمدی mirsamadi تهران- خیابان نیایش- بیمارستان حضرت رسول اکرم (ص)- مرکز تحقیقات چشم

purpose: to determine bacterial contamination of corneas and corneal storage media provided from the eye bank of i.r. iran to rasool akram medical center. methods: this descriptive study was performed on 70 corneoscleral rims and corneal storage media. one milliliter of corneal storage media and the corneoscleral rim were sent to microbiology laboratory at the time of penetrating keratoplasty a...

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