Results 21 to 30 of about 130 (116)

Stereoselective Synthesis of β‐C‐glycosides From Exoglycals Through Radical C─C Bond Formation

Chemistry – A European Journal, Volume 32, Issue 40, 27 October 2026.
We describe herein a convenient strategy for the preparation of β‐C‐glycosides via the addition of radical species onto exoglycals. This method is efficient, general and achieved in mild conditions starting from xanthates derivatives and using triethylborane as initiator and 4‐tert‐butylcatechol as hydrogen atom source. This hydroalkylation reaction is
Noémie Murard, Guillaume Pilet, David Gueyrard   +2 more
wiley   +1 more source

PRESENCIA DE RESIDUOS Y CONTAMINANTES EN LECHE HUMANA

Revista Española de Salud Pública, 2002
La contaminación de la leche humana por xenobióticos es un problema generalizado a nivel mundial, que se ve afectado por las variaciones geográficas, climáticas, culturales y socioeconómicas de cada lugar. Las políticas de salud pública han enfrentado
Guadalupe Prado Flores, Rita Carabias Martínez, Encarna Rodríguez Gonzalo, Eliseo Herrero Hernández   +3 more
doaj   +2 more sources

Enhanced Selectivity of Chalcogen Bonding over Halogen Bonding Catalyzed C‐glycosylation Through Differentiated Intermediate Activation

Angewandte Chemie, Volume 138, Issue 2, 9 January 2026.
By harnessing chalcogen bonding (ChB) catalysis, an exclusive access into a highly stereoselective strain‐release C‐glycosylation pathway was discovered. This was surprisingly not replicable by the conceptually similar halogen bonding (XB) catalysis.
Hao Guo, Charles C. J. Loh
wiley   +2 more sources

Diagnostic Performance of a Deep Learning Model Using Phonocardiogram and Single‐Lead ECG Signals for Detecting Moderate‐or‐Greater Aortic Stenosis: Multicenter External Validation

Clinical Cardiology, Volume 49, Issue 10, October 2026.
In an independent multicenter cohort of 951 patients undergoing echocardiography, a deep learning model analyzing an 8‐s heart sound and ECG recording detected moderate‐or‐greater aortic stenosis with 92.9% sensitivity and 87.9% specificity. This approach may support the decision to refer patients from auscultation to echocardiography.
Shumpei Saito, Masanobu Ishii, Shimpei Ogawa, Hiroshi Seki, Koshiro Ikeda, Youhei Kayano, Yuhei Yasui, Ginga Sato, Mitsuru Ohishi, Takuro Kubozono, Naritatsu Saito, Eri Toda Kato, Masahiro Yamada, Shunsuke Natori, Yuki Kunikane, Takafumi Yokomatsu, Masashi Kato, Yasuaki Sagara, Nami Uchiyama, Nobuhiko Atsuchi, Shota Kawahara, Shoji Natsugoe, Noriaki Tabata, Kenichi Tsujita   +23 more
wiley   +1 more source

The crystal structure of poly(ethylene furanoate) [PDF]

Polymer, 2016
Abstract The crystal structure of poly(ethylene furanoate) (PEF) has been determined using X-ray fiber diffraction (XRFD) combined with molecular modeling. Analysis of the XRFD data suggested the space group was P21, with a monoclinic unit cell where a = 5.784 A, b = 6.780 A, c = 20.296 A, and γ = 103.3°, giving a calculated unit cell density of the ...
Yimin Mao, Robert M. Kriegel, David G. Bucknall   +2 more
openaire   +1 more source

Retro‐Hetero‐Michael Addition Strategies in Organic Synthesis

European Journal of Organic Chemistry, Volume 29, Issue 32, 24 August 2026.
In this review, synthetic approaches to carbo‐ and heterocyclic compounds, including natural products, published in the last 15 years (2011–2025) which have either relied upon or included a retro‐hetero‐Michael addition step at any stage are discussed.
Dina Scarpi, Ernesto G. Occhiato
wiley   +1 more source

Highly efficient mechanochemical depolymerisation of bio-based polyethylene furanoate and polybutylene furanoate

RSC Sustainability
We present a mechanochemical protocol for the efficient depolymerisation of bio-based poly(ethylene furanoate) (PEF) and poly(butylene furanoate) (PBF) as alternatives to commodity plastics such as poly(ethylene terephthalate) (PET).
Divya Jain, Florian Cramer, Pauline Shamraienko, Hans-Joachim Drexler, Brigitte Voit, Torsten Beweries   +5 more
openaire   +1 more source

Full‐pattern fitting of X‐ray powder diffraction data to determine allophane and organic matter contents in soils

Soil Science Society of America Journal, Volume 90, Issue 4, July/August 2026.
Abstract Full‐pattern fitting of X‐ray powder diffraction (XRPD) data using reference materials has attracted increasing attention as a high‐throughput method to determine the contents of long‐range‐ordered (i.e., crystalline) materials in soils. We hypothesized that this XRPD method can also be used to quantify short‐range‐ordered (SRO) materials with
Maya Hamaguchi, Kohei Kurokawa, Atsushi Nakao, Masayuki Tani, Hiroaki Shimada, Yuji Maejima, Morimaru Kida, Nobuhide Fujitake, Mayuko Seki, Junta Yanai   +9 more
wiley   +1 more source

Agonistas del receptor de hidrocarburos de arilo como contaminantes en alimentos para la producción animal

Revista de Producción Animal, 2022
Antecedentes: La salud de los humanos y animales está estrechamente vinculada. Muchos alimentos pueden contener materiales tóxicos y la mayoría de los productos químicos tienen un rango de uso seguro, pero en dosis altas pueden ser dañinos.
Oscar Guillermo Collado García , Manuel de Jesús Álvarez Gil , Silvio José Martínez Sáez   +2 more
doaj  

Características estruturais de ácidos húmicos isolados de solos com adição de resíduos orgânicos de origem urbana: composição elementar, análise de RMN 13C e Pi-CG/EM

Revista Brasileira de Ciência do Solo, 2002
Foram avaliadas as alterações nas características estruturais de ácidos húmicos (AH) decorrentes da adição de matéria orgânica de resíduos urbanos. Os AH foram extraídos da camada superficial (0-20 cm) de um Argissolo Vermelho-Amarelo (Seropédica, RJ) e ...
L. P. Canellas, A. A. Moraes, V. M. Rumjanek, M. R. Garcia, F. Guridi, G. A. Santos, A. C. X. Velloso, R. Braz-Filho   +7 more
doaj   +1 more source