Results 31 to 40 of about 11,711 (150)
Factores asociados con el uso del preservativo en jóvenes universitarios
Revista Ciencias de la SaludIntroducción: En el mundo, se ha evidenciado el incremento de embarazos no planeados y enfermedades de trasmisión sexual, Virus de Inmunodeficiencia Humana (ETS/VIH) centrándose en la población adolescente y adulta por optar conductas riesgosas en su ...
Carlos Andrés Quiroz Mora +4 more
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Radiometric Constraints on the Timing, Tempo, and Effects of Large Igneous Province Emplacement
Geophysical Monograph Series, Page 27-82., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Jennifer Kasbohm +2 more
wiley +1 more source
Universidad Médica Pinareña, 2023 Introducción: la baja incidencia en el uso del condón expone a las personas y en especial a jóvenes y adolescentes a practicar conductas sexuales de riesgo exponiéndose a contraer alguna infección de transmisión sexual.
Ilian Estaban Tarife Romero +4 more
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Chemistry – A European Journal, EarlyView.To expand the acid‐responsive behavior of diphenylpyridylmethyl stable luminescent radicals, additional pyridyl groups were introduced. Dual acid responsiveness was observed, involving both the newly incorporated pyridyl groups and the PyBTM moieties.
Yohei Hattori +3 more
wiley +1 more source
Chemistry – A European Journal, EarlyView.A sustainable route to photoresponsive molecular systems is achieved using the bio‐based flavanone (‐)‐isolonchocarpin from Tephrosia vogelii. Through McMurry homocoupling and light‐driven 6‐π‐electrocyclization, an overcrowded alkene and a fluorescent O‐heterocyclic phenanthrene are synthesized.
Deryl H. Limawan +8 more
wiley +1 more source
Chemistry – A European Journal, EarlyView.A library of 21 tetrakis(phenothiazinyl)‐substituted silanes with broadly variable substituent decoration, which are fully reversible multistage redox systems with intense tunable emission from deep blue to yellow–green (441–533 nm), was rapidly synthesized by bromine–lithium exchange/borylation–Suzuki coupling of tetrakis(4‐bromophenyl)silane or by ...
Thomas P. M. Merke +4 more
wiley +1 more source
The Mechanism of Visible‐Light Photochemical Rearrangements of Conjugated Amide Enolates
Chemistry – A European Journal, EarlyView.Visible light irradiation of extended enolates of N‐benzylamides leads to homolytic C─N Bond cleavage, generating a biradical. Computational and mechanistic studies suggest rapid radical recombination within a solvent cage to give either ring‐expanded or rearranged products. ABSTRACT Deprotonation of conjugated amides forms colored solutions of lithium
James Mortimer +3 more
wiley +1 more source
Percepciones y barreras del uso del condón en hombres que viven con VIH: Un análisis ecológico
Revista Digital Internacional de Psicología y Ciencia SocialEste estudio investigó los factores de riesgo asociados al uso del condón en hombres jóvenes que viven con VIH en la Ciudad de México. Participaron siete hombres diagnosticados en el último año, con edad promedio de 21 años.
Ricardo Sánchez-Medina +4 more
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Anisotropy Factor Spectra for Weakly Allowed Electronic Transitions in Chiral Ketones
ChemPhysChem, Volume 26, Issue 6, March 15, 2025.Anisotropy factor spectra for the weak n→π*‐type A‐band of chiral ketones cannot be described within the Franck–Condon approximation. Thus, we present such spectra computed by accounting for Herzberg–Teller corrections and compare them to experiments for fenchone, camphor and 3MCP to describe chiroptical properties of these molecules in the mid to near
Leon A. Kerber +5 more
wiley +1 more source
Percepciones sobre el uso del condón y la sexualidad entre jóvenes
Revista Latinoamericana en Ciencias Sociales, Niñez y Juventud, 2012 El objetivo fue determinar la relación entre percepciones sobre el uso del condón y la actividad sexual de riesgo en jóvenes universitarios y universitarias.
J. Isaac Uribe +3 more
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