Results 51 to 60 of about 84,691 (149)

The Schwann Cell

Acta Biológica Colombiana, 2004
The neurones are the cells of the nervous system and are surrounded and protected by glials cells. In the peripheral nervous system the Schwann cells (SC) are the glia of the nerves.
Sandra Perdomo, Clara Spinel
doaj  

An Effect of Fe³⁺ Ion Substitution for Cr³⁺ in the Octahedral Sites of FeCr₂O₄ Multiferroic Spinel: Mössbauer Spectroscopy Study

Magnetochemistry, 2023
We present the results of a successful synthesis and investigation of polycrystalline Fe2+(Cr3+, Fe3+)2O4 powder, where 1/8 part of the Cr3+ ions in the octahedral sites is substituted by the Fe3+ ones.
Almaz L. Zinnatullin, Mikhail A. Cherosov, Ruslan G. Batulin, Farit G. Vagizov, Roman V. Yusupov   +4 more
doaj   +1 more source

Competitive segregation of gallium and indium at heterophase Cu–MnO interfaces studied with transmission electron microscopy [PDF]

, 2003
This paper concentrates on the possible segregation of indium and gallium and competitive segregation of gallium and indium at atomically flat parallel {111}-oriented Cu–MnO interfaces.
Hosson, J.Th.M. De,, Kooi, B.J.,, Mogck, S.,   +2 more
core   +4 more sources

The Calcium Wave of Vegetable Cells

Acta Biológica Colombiana, 2007
Calcium is an essential nutrient for plants; it is involved in developmental processes and in responses to biotic and abiotic factors. Several signals that modify the calcium concentration in the cytoplasm, endoplasmic reticulum, nucleus and/or plastids ...
TD. Geydan, Clara Spinel
doaj  

Magnesium Doped Hercynite: Preparation and Formation Mechanism

Medžiagotyra, 2018
We investigated the formation mechanism of magnesium doped hercynite during reaction sintering process at 1400 ºC. A two-step synthesis procedure based on combining of spinel and ferrous chloride was considered here.
Hossien RAHMANI-BOLDAJI, Mohammad-reza SAERI, Sasan OTROJ, Hassan SHARIFI   +3 more
doaj   +1 more source

Spark plasma sintering synthesis of Ni1−xZnxFe2O4 ferrites: Mössbauer and catalytic study [PDF]

, 2012
Nickel-zinc ferrite nanoparticles, Ni1-xZnxFe2O4 (x ¼ 0, 0.2, 0.5, 0.8, 1.0) were prepared by combination of chemical precipitation and spark plasma sintering (SPS) techniques and conventional thermal treatment of the obtained precursors.
Estournès, Claude, Koleva, Kremena, Kunev, Boris, Manova, Elina, Mitov, Ivan, Paneva, Daniela, Petkova, Vilma, Tenchev, Krassimir, Tsoncheva, Tanya, Velinov, Nikolay   +9 more
core   +3 more sources

Un algoritmo para integrar ecuaciones diferenciales de segundo orden

Momento, 1995
An algorithm is developedto integrate a differential equation of the form  [Physical Formula]  It is shown thatthe algorithm so obtained reduces to the Numerov algorithm when F(x) = O.
Marta Spinel de Uribe
doaj  

Erratic behavior of platinum-group elements along an olivine–Cr-spinel cotectic in sulfide-undersaturated basaltic magma: roles of Cr-spinel and alloys

Scientific Reports
The behavior of platinum-group elements (PGE) in sulfide-undersaturated primitive magmas may be controlled by crystallization of either Cr-spinel, platinum-group minerals (PGM) or olivine.
Ivan. F. Chayka, Vadim S. Kamenetsky, Anton V. Kutyrev, Sarah-Jane Barnes, Aleksandr S. Stepanov, Sergey E. Konstantinov, Nikolay I. Baykov, Sergey G. Kryazhev, Ivan A. Belousov, Irina A. Zhukova, Vasily D. Scherbakov, Valery M. Kalugin, Alexey V. Ivanov, Nikolay V. Bryanskiy, Jung-Woo Park   +14 more
doaj   +1 more source

Phase Control on Surface for the Stabilization of High Energy Cathode Materials of Lithium Ion Batteries. [PDF]

, 2019
The development of high energy electrode materials for lithium ion batteries is challenged by their inherent instabilities, which become more aggravated as the energy densities continue to climb, accordingly causing increasing concerns on battery safety ...
Bin, De-Shan, Cao, An-Min, Duan, Shu-Yi, Gong, Yue, Gu, Lin, Ma, Jianmin, Piao, Jun-Yu, Sun, Yong-Gang, Tao, Xian-Sen, Wan, Li-Jun, Wei, Zengxi, Wu, Jinpeng, Yang, Wanli   +12 more
core   +2 more sources

La integral de la ecuación de Klein Gordon

Momento, 1995
Se plantea un método para integrar Ecuaciones Diferenciales Parciales y se aplica. a la ecuación de onda de Klein Gordon. Se hace un desarrollo detallado para paquetes de onda cuando es posible definir una velocidad de grupo.
Marta Spinel de Uribe
doaj