Results 51 to 60 of about 4,870 (138)

Síntese de éster de cadeia longa via catálise básica heterogênea (Synthesis of long chain ester by heterogeneous base catalysis)

open access: yesEclética Química, 2018
A long chain ester was prepared by transesterification of methyl palmitate with long chain alcohol using magnesium oxide as catalyst prepared by thermal decomposition of different precursors with the intention of establish relations among structural ...
Dorsan dos Santos Moraes   +2 more
doaj   +1 more source

Antimycobacterial and Nitric Oxide Production Inhibitory Activities of Goyazensolide and Centratherin Isolated From Eremanthus crotonoides by High‐Speed Countercurrent Chromatography

open access: yesChemistry &Biodiversity, Volume 23, Issue 3, March 2026.
ABSTRACT In this study, bioassay‐guided fractionation of the ethanolic extract from Eremanthus crotonoides leaves enabled the isolation of two bioactive sesquiterpene lactones, centratherin and goyazensolide, which were evaluated for their antimycobacterial and anti‐inflammatory properties.
Natalie Giovanna da Rocha Ximenes   +7 more
wiley   +1 more source

Density Functional Theory Applied to Excited State Intramolecular Proton Transfer in Imidazole-, Oxazole-, and Thiazole-Based Systems

open access: yesMolecules, 2018
Excited state intramolecular proton transfer (ESIPT) is a photoinduced process strongly associated to hydrogen bonding within a molecular framework. In this manuscript, we computed potential energy data using Time Dependent Density Functional Theory ...
Fabricio de Carvalho   +3 more
doaj   +1 more source

Competition Between Phenothiazines and BH3 Peptide for the Binding Site of the Antiapoptotic BCL-2 Protein

open access: yesFrontiers in Chemistry, 2020
The study of proteins and mechanisms involved in the apoptosis and new knowledge about cancer's biology are essential for planning new drugs. Tumor cells develop several strategies to gain proliferative advantages, including molecular alterations to ...
Aline Lagoeiro do Carmo   +7 more
doaj   +1 more source

Toxocara cati (Nematoda, Ascarididae) in different wild feline species in Brazil: new host records

open access: yesBiotemas, 2013
This is the first detailed description of Toxocara cati parasitizing felines in South America. Seventeen run over wild felines (Leopardus colocolo, Leopardus geoffroyi, Leopardus tigrinus, and Puma yagouaroundi) were collected from different towns in ...
Moisés Gallas, Eliane Fraga da Silveira
doaj   +1 more source

As ciências naturais e as ciências do espírito na era da globalização

open access: yesVeritas, 2006
Este artigo, o autor apresenta, primeiramente, reflexões de cunho histórico sobre a relação entre as Ciências Naturais e as Ciências do Espírito, seguidas de observações, de caráter mais sistemático, sobre o conceito das próprias Ciências do Espírito ...
Jaeschke, Walter
doaj  

A extensão da impostura

open access: yesCadernos de Saúde Pública, 2000
A partir da crítica ao livro Imposturas Intelectuais (1999), de A. Sokal & J. Bricmont, enfoca-se o tema da interdisciplinaridade entre Ciências Humanas e Ciências Naturais, no que esta abordagem é imprescindível aos assim chamados "novos paradigmas" de ...
Aleksandrowicz Ana Maria C.
doaj  

Natural and redesigned wasp venom peptides with selective antitumoral activity

open access: yesBeilstein Journal of Organic Chemistry, 2018
About 1 in 8 U.S. women (≈12%) will develop invasive breast cancer over the course of their lifetime. Surgery, chemotherapy, radiotherapy, and hormone manipulation constitute the major treatment options for breast cancer.
Marcelo D. T. Torres   +8 more
doaj   +1 more source

Educação Médica em tempos de pandemia e a utilização de metodologias ativas mediadas por tecnologia

open access: yesMedicina, 2021
O objetivo deste relato de experiência é apresentar a utilização de metodologias ativas mediadas por tecnologia em tempos de pandemia na disciplina Integração Básico-Clínica II do curso de Medicina. A experiência é caracterizada como uma possibilidade de
Ana Carolina de Melo   +5 more
doaj  

A extensão da impostura

open access: yesCadernos de Saúde Pública
A partir da crítica ao livro Imposturas Intelectuais (1999), de A. Sokal & J. Bricmont, enfoca-se o tema da interdisciplinaridade entre Ciências Humanas e Ciências Naturais, no que esta abordagem é imprescindível aos assim chamados "novos paradigmas" de ...
Ana Maria C. Aleksandrowicz
doaj   +2 more sources

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