Results 81 to 90 of about 108,024 (198)
Advanced Synthesis &Catalysis, Volume 368, Issue 9, 5 May 2026.Fungal unspecific peroxygenases (UPOs) are promiscuous heme‐containing enzymes that selectively oxyfuntionalize C‐H bonds. Structural and enzymatic reaction studies of an evolved UPO mutant from Candolleomyces (Psathyrella) aberdarensis (PabUPO‐I) reveal how the heme channel architecture dictates the regioselectivity towards alkanes, fatty acids and ...
Andrea Menés‐Rubio +6 more
wiley +1 more source
Bioactive Secondary Metabolites from Phomopsis sp., an Endophytic Fungus from Senna spectabilis
Molecules, 2014 Chemical investigation of an acetonitrile fraction from the endophytic fungus Phomopsis sp. led to the isolation of the new natural product 2-hydroxy-alternariol (7) together with the known compounds cytochalasins J (1) and H (2), 5'-epialtenuene (3) and
Vanessa Mara Chapla +10 more
doaj +1 more source
Chemistry – A European Journal, Volume 32, Issue 17, 5 May 2026.An efficient Scholl–based strategy enables precise control of the C–C bond to access the first hexabenzocoronene–containing helical twistacene (NG2). The resulting nanographene shows pronounced helical distortion, high stability, enhanced solubility, and promising redox and optoelectronic properties.
Juan P. Mora‐Fuentes +8 more
wiley +1 more source
Dinâmica da matéria orgânica no ambiente. [PDF]
, 2013 bitstream/item/32409/1/documento-105 ...
MARTIN NETO, L. +2 more
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Carbamate‐Directed peri‐CH Alkynylation: Application to the Synthesis of Zethrenes and Pyranthrenes
ChemistryEurope, Volume 4, Issue 5, May 2026.The Rh(III)‐catalyzed regioselective alkynylation of 1‐pyrenyl and 1‐naphthyl carbamates with bromoacetylenes enables the selective installation of an alkyne at the peri position of readily accessible amino‐substituted polycyclic aromatic hydrocarbons (PAHs).
Xiaoqing Shao +4 more
wiley +1 more source
Beilstein Journal of Organic Chemistry, 2017 This work describes a new approach to obtain new β-vinylporphyrin derivatives through palladium-catalyzed cross-coupling reaction of 2-bromo-5,10,15,20-tetraphenylporphyrinatozinc(II) with N-tosylhydrazones.
Vinicius R. Campos +5 more
doaj +1 more source
Avaliação de parâmetros físicos e químicos do efluente de uma Grande indústria frigorífica de aves [PDF]
, 2006 TCC (graduação) - Universidade Federal de Santa Catarina. Centro de Ciências Físicas e Matemáticas. Curso de Química.As indústrias frigoríficas de aves geram uma grande quantidade de efluentes líquidos com elevada concentração de poluentes, necessitando ...
MORÉS, Silvane
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Quantifying Carboxylate Burial in Synthetic Hydrophobic Pockets in Water
ChemistryEurope, Volume 4, Issue 5, May 2026.How “buried” is a buried ion? Double mutant cycles quantify the cost of placing a carboxylate within a deep aromatic calix[4]pyrrole pocket in water. The penalty is only +1.3 to +3.0 kcal·mol−1 because water penetrates through cracks and the portal, creating a wet, high‐dielectric microenvironment.
Esteban A. Valencia +4 more
wiley +1 more source
Carboxyxanthones: Bioactive Agents and Molecular Scaffold for Synthesis of Analogues and Derivatives
Molecules, 2019 Xanthones represent a structurally diverse group of compounds with a broad range of biological and pharmacological activities, depending on the nature and position of various substituents in the dibenzo-γ-pyrone scaffold.
João Ribeiro +4 more
doaj +1 more source
Contribuição ao estudo das características físico-químicas e da fração lipídica do leite orgânico. [PDF]
, 2008 Produtos orgânicos consistem em uma alternativa para uma alimentação saudável. Considera-se leite orgânico aquele produzido em sistema no qual é vedado o uso de agrotóxico sintético ou outros insumos artificiais tóxicos e organismos geneticamente ...
Almeida, Keila Emílio de +6 more
core +3 more sources