Results 31 to 40 of about 2,315 (265)

Niveles de contaminación del agua potable en la cabecera municipal de Ascención, Chihuahua, México

Nova Scientia, 2015
Introducción: El agua es una sustancia indispensable para la vida por lo que se considera como el recurso natural más apreciado en el planeta. En el norte de México existe el “Programa ambiental México-Estados Unidos: Frontera 2020”; en el cual ...
Héctor Osbaldo Rubio Arias, Lourdes Raquel Balderrama Terrazas, Eduviges Burrola Barraza, Guadalupe Nelson Aguilar Palma, Rubén Alfonso Saucedo Terán   +4 more
doaj   +1 more source

Efectos de las actividades antrópicas sobre parámetros metabólicos en un bivalvo invasor y otro nativo en el tramo inferior del río Paraná

Ecología Austral, 2022
La relación entre la contaminación antrópica, la geoquímica y la dinámica natural de los ecosistemas de agua dulce determinan patrones espaciales y temporales de calidad del agua. Las actividades humanas y la introducción de especies exóticas son causas
Tatiana Noya Abad, Julieta Peluso, Yanina S. Minaberry, Dante E. Rojas, Diego Cristos, Henrique Knack De Almeida, María S. Yusseppone, Carolina M. Aronzon, Javier Á. Calcagno, Sebastián E. Sabatini   +9 more
doaj   +1 more source

PAK1 activation drives divergent resistance mechanisms to aromatase inhibition and tamoxifen in a luminal: A breast cancer model

Molecular Oncology, EarlyView.
Breast cancer remains a major cause of cancer death in women, frequently developing endocrine therapy resistance. This study demonstrates that upregulated p21‐activated kinase 1 (PAK1) activity drives resistance to tamoxifen and long‐term estrogen deprivation in ER+ breast cancer models.
Luisa Schwarzmüller, Janina Müller, Efstathios‐Iason Vlachavas, Lukas Beumers, Lena Fleischhacker, Sara Burmester, Angelika Wörner, Sabine Karolus, Dominic Helm, Cindy Körner, Stefan Wiemann   +10 more
wiley   +1 more source

Sudden anaerobization in Amphibacillus xylanus increases intracellular labile ferrous iron and inhibits cell growth

FEBS Open Bio, EarlyView.
Abruptly changing from aerobic to anaerobic conditions (sudden anaerobization) induced growth inhibition and a significant increase in intracellular labile ferrous iron in the aerotolerant anaerobe Amphibacillus xylanus. We found that free flavins mediate efficient electron transfer from NADH to ferric iron under anaerobic conditions, suggesting that ...
Shinya Kimata, Yoichi Sakai, Keisuke Tanaka, Etsuro Yoshimura, Ken Kitano, Morio Ishikawa, Tadahiro Nakamoto, Tsutomu Takayama, Hirofumi Inoue, Kaho Nomura, Tomonori Suzuki, Masataka Uchino, Akira Abe, Youichi Niimura   +13 more
wiley   +1 more source

Versatile vector tools for efficient protein screening across multiple expression systems

FEBS Open Bio, EarlyView.
A unified vector toolkit enables rapid protein expression screening across E. coli, insect, and mammalian cells. A single primer pair amplifies the target gene, which is inserted into any vector via a standardized interface. This streamlined workflow eliminates repeated cloning steps, accelerating the identification of optimal expression conditions for
Zhimin Zhu, Yaqing Liu, Lei Qin, Feng Yu, Qisheng Wang, Yahui Liu   +5 more
wiley   +1 more source

UiO‐66 metal–organic frameworks in biomedicine: From structural tunability to bioimaging, photodiagnostics, and photodynamic cancer therapy

FEBS Open Bio, EarlyView.
UiO‐66(Zr) metal–organic frameworks are chemically stable, biocompatible, and highly tunable nanomaterials. Their modular structure enables controlled drug delivery, multimodal bioimaging, and light‐activated photodynamic therapy, supporting integrated diagnostic and therapeutic (theranostic) applications in cancer and biomedical research.
Veronika Huntošová, Grigorii Rakhalskii, Miroslav Almáši   +2 more
wiley   +1 more source

Metal–Metal Bonding

, 2013
This chapter deals with the electronic structure of metal-metal bonds in molecular systems, a diverse topic that now spans almost the entire periodic table. The field is most often associated with strong multiple bonds such as the iconic quadruple bond in [Re2Cl8]2-, and the recently discovered ultra-short Cr-Cr quintuple bonds provide a remarkable ...
openaire   +2 more sources

The crystal structure of the Borrelia burgdorferi nicotinamidase BBE22 resolves a long‐standing annotation error

FEBS Open Bio, EarlyView.
The crystal structure of Borrelia burgdorferi nicotinamidase (PncA/BBE22) reveals the correct full‐length protein initiated from a non‐canonical AUU start codon. The structure validates previous biochemical findings and resolves a long‐standing annotation error, demonstrating that the truncated database sequence is structurally incompatible with the ...
Kalvis Brangulis
wiley   +1 more source

Distribución de Fe, Zn, Pb, Cu, Cd y As originada por residuos mineros y aguas residuales en un transecto del Río Taxco en Guerrero, México

Revista Mexicana de Ciencias Geológicas, 2013
El manejo inadecuado de los residuos del procesamiento de minerales es una de las principales fuentes de metales y arsénico hacia los ríos en los cuales pueden alcanzar niveles peligrosos para los seres humanos y los ecosistemas.
Miriam Méndez-Ramírez, María Aurora Armienta Hernández   +1 more
doaj  

Contenido de metales pesados en los peces en el Perú: una revisión sistémica

Revista de Investigación e Innovación Agropecuaria y de Recursos Naturales
La contaminación por metales pesados ​​en los ecosistemas acuáticos del Perú, derivada de actividades mineras, industriales y urbanas, representa un riesgo para la fauna y la salud humana.
Manuel Mamani Flores, Jessy Blas Alvarado, Sergio Izquierdo Villaverde, Cauper Gil Gonzales, Maritza Andrade Saavedra, Dina Pari Quispe   +5 more
doaj   +1 more source