Results 111 to 120 of about 2,796,987 (295)

NMR-Based Structural Analysis of Highly Substituted Pyridines From Kondrat'eva Aza-Diels-Alder Cycloadditions. [PDF]

open access: yesMagn Reson Chem
We report the results from a kinetic and mechanistic investigation of an inverse‐electron‐demand Diels–Alder (IEDDA) cycloaddition involving an oxazole‐type diene synthesized via an Ugi–Zhu multicomponent reaction (UZ‐3CR). ABSTRACT Pyridines are a crucial class of heterocycles with widespread applications in natural products, pharmaceuticals, and ...
Suárez-Moreno GV   +6 more
europepmc   +2 more sources

Fecal Steroids as Tracers of Human Population and Waste Management Practices at the Ancient Maya City of Ucanal, Guatemala

open access: yesArchaeometry, EarlyView.
ABSTRACT Geochemical data compiled from dried sediments from three water reservoirs at the ancient Maya city of Ucanal, Petén, Guatemala, reveal low to undetectable fecal biomarker concentrations. These low concentrations may be the result of the aerobic decay of sterols combined with well‐managed waste disposal practices.
Jean D. Tremblay   +3 more
wiley   +1 more source

The implementation of graphic organizers to teach reading comprehension skills to second graders of the sur oriental Boston Branch School [PDF]

open access: yes, 2019
El propósito del siguiente proyecto fue seguir una secuencia didáctica y aplicar mapas mentales tal como un organizador gráfico como herramienta de entendimiento y al mismo tiempo mejorar las habilidades de lectura en el L2 con el fin de guiar los ...
Londoño Morales, Andrés Felipe   +2 more
core  

Identification and Quantification of Volatile Organic Compounds and Bioaerosols in the Conservation Processes of Guanche Mummies

open access: yesArchaeometry, EarlyView.
ABSTRACT The Guanche mummies, ancient inhabitants of the Canary Islands, represent a significant part of the historical heritage preserved at the Museum of Nature and Archaeology (MUNA) in Tenerife, Spain. These mummies, subjected to artificial conservation practices, are of great interest to conservators seeking to understand their mummification ...
Benigno Sánchez   +5 more
wiley   +1 more source

APUNTES HACIA UNA DEFINICION METODOLOGICA DEL PROYECTO SOCIAL URBANO

open access: yesAbra, 1988
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Proyecto Desarrollo Social Urbano
doaj  

Creando espacios de colaboración multidisciplinaria en las escuelas: Retos y oportunidades

open access: yesVoces desde el Trabajo Social, 2018
El objetivo principal de este trabajo es documentar nuestra experiencia de colaboración a través de diferentes proyectos de investigación que involucran profesionales de distintas disciplinas laborando en escenarios escolares y universitarios, teniendo ...
Giselle Cordero-Arroyo   +6 more
doaj   +1 more source

Individual differences in arithmetic fluency [PDF]

open access: yes, 2016
Este estudio contrasta la hipótesis de que las dificultades que tienen algunos sujetos en el dominio de las tablas de multiplicar se deban a su incapacidad para afrontar la interferencia. Los resultados no muestran diferencias en medidas de interferencia
Calleja-Reina, Marina   +4 more
core  

When and why to give shorebirds a head start

open access: yesConservation Biology, EarlyView.
Abstract Headstarting is a translocation technique involving the hatching or rearing of wild eggs or young in captivity and the release of those individuals back to the wild at or before independence. It has been trialed as a conservation intervention for shorebirds over recent decades to improve the population trend of target populations by increasing
Lynda Donaldson   +4 more
wiley   +1 more source

The Integration of the English Language Skills to Teach Physical Education to 6th Graders from a public school [PDF]

open access: yes, 2019
En este proyecto de aula se busca integrar las cuatro habilidades del inglés para enseñar Educación Física a estudiantes de sexto grado de un colegio público.
Betancur Agudelo, Mauricio   +2 more
core  

Effects of parachute science on local research capacity 降落伞科学对当地研究能力的影响

open access: yesConservation Biology, EarlyView.
Abstract Strengthening research capacity is essential to address the global biodiversity crisis. Yet, parachute science often undermines this goal, and its prevalence, costs, and benefits are unclear. We analyzed 13,502 publications on primate research that we extracted from Scopus (1960–2022) to evaluate the effects of parachute science on local ...
Li Yang   +11 more
wiley   +1 more source

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