Results 21 to 30 of about 879,176 (178)

CHRMISTRY OF NATURAL PRODUCTS AS A SOURCE OF BIOLOGIRALLY ACTIVE MOLECULES

open access: yes, 2003
Los productos naturales son fuente de moléculas con aplicaciones en diferentes campos de la vida humana. En este artículo se describe el aislamiento, la identificación y la actividad de varios metabolitos secundarios obtenidos de plantas colombianas ...
Echeverri López, Luis Fernando
core   +1 more source

The collective application of shorebird tracking data to conservation

open access: yesConservation Biology, EarlyView.
Abstract Addressing urgent conservation issues, such as the drastic declines of North American migratory birds, requires creative, evidence‐based, efficient, and collaborative approaches. The abundance of over 50% of monitored North American shorebird populations has declined by over 50% since 1980. To address these declines, we developed a partnership
Autumn‐Lynn Harrison   +71 more
wiley   +1 more source

The Search for New Antimicrobial Agents, by Site-Selective Peptide Modification

open access: yesProceedings, 2017
Antimicrobial peptides (AMPs) have been used by animals and plants for millions of years for defence against pathogens, and present important advantages as potential drugs, such as a broad spectrum of activity, no induction of resistances, and synergic ...
Alicia Boto   +5 more
doaj   +1 more source

The obsolescence of protected area categories in a polycrisis world

open access: yesConservation Biology, EarlyView.
Abstract Current global conservation models face significant limitations in addressing the global polycrisis, and the constraints of the International Union for Conservation of Nature protected area (PA) classification system are part of the issue. The principles of the new conservation paradigm—governance, equity, and interculturality—are not viable ...
Pamela Esther Degele
wiley   +1 more source

D005, nuevo ingrediente activo obtenido a partir de los frutos de Acrocomia crispa

open access: yesRevista CENIC Ciencias Químicas, 2015
Los frutos de las palmas (familia Arecaceae) constituyen un importante recurso oleaginoso, tanto para la producción de aceites y grasas comestibles como para las industrias farmacéutica y cosmética.
Roxana de la Caridad Sierra-Pérez   +6 more
doaj  

Efficient Oral Priming of Tenebrio molitor Larvae Using Heat-Inactivated Microorganisms

open access: yesVaccines, 2022
Microbial resistance is a global health problem that will increase over time. Advances in insect antimicrobial peptides (AMPs) offer a powerful new approach to combat antimicrobial resistance.
Sergio González-Acosta   +6 more
doaj   +1 more source

Individual Differences and Task Complexity in Second Language Writing: A Methodological Review

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT This article provides a methodological review of empirical studies on second language (L2) writing and task complexity that have investigated the role of learner individual differences (IDs) in L2 writing processes and outcomes. Thirty journal articles published between 2005 and 2025 were coded for key theoretical, methodological (including ID
Janire Zalbidea, Bernard I. Issa
wiley   +1 more source

Isolamento e identificação de triterpenos friedelanos de maytenus robusta Reiss [PDF]

open access: yes, 1996
Dissertação (Mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas.Maytenus robusta Reiss (Celastaceae) é uma planta característica da floresta ombrófila densa (Floresta Atlântica), apresentando maior densidade nas ...
Krogh, Renata
core  

Anisotropic NMR as a Crucial Tool for Differentiation of Epimers With High Conformational Flexibility

open access: yesAngewandte Chemie, Volume 138, Issue 30, 20 July 2026.
Epimer discrimination remains challenging due to subtle NMR differences. Here, we propose a methodology based on 13C‐RCSA and RDC anisotropic parameters, enabling the assignment of two flexible tetraprenyltoluquinol epimers (1a and 1b) with remote stereoclusters.
Juan Carlos C. Fuentes‐Monteverde   +6 more
wiley   +2 more sources

Estudio de estabilidad a largo plazo de tabletas de Abexol® envasadas en frascos de polietileno de elevada densidad

open access: yesRevista CENIC Ciencias Químicas, 2012
La mezcla de alcoholes grasos extraídos y purificados de la cera de abejas Apis mellifera, constituye el ingrediente activo de las tabletas de Abexol®, las que presentan efectos antioxidantes y gastroprotectores.
Víctor Luis González-Canavaciolo   +5 more
doaj  

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