Results 31 to 40 of about 4,368 (223)

Formation of nanocrystals based on decomposition in the amorphous Zr41.2Ti13.8Cu12.5Ni10Be22.5 alloy [PDF]

open access: yes, 1996
Primary crystallization and decomposition in the bulk amorphous alloy Ar41.2Ti13.8Cu12.5Ni10Be22.5 have been studied by small angle neutron scattering (SANS), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC).
Johnson, W. L.   +2 more
core   +1 more source

Model arenes hydrogenation with silica-supported rhodium nanoparticles:The role of the silica grains and of the solvent on catalytic activities [PDF]

open access: yes, 2009
Silica-supported rhodium-based nanoheterogeneous catalysts were easily prepared by impregnation with a pre-stabilized colloidal suspension. The resulting catalysts contain rhodium nanoparticles well-dispersed in the silica pores with a mean size of 5 nm.
Barthe, Laurie   +5 more
core   +3 more sources

Apoptosis and expression of argyrophilic nucleolus organizer regions in epithelial neoplasms of the larynx

open access: yesBrazilian Journal of Otorhinolaryngology, 2015
INTRODUCTION: Occurrence of apoptosis and expression of proliferative markers are powerful tools to establish a prognosis in the follow-up of cancer.OBJECTIVE: To evaluate the growth fraction in papillomas and laryngeal squamous cell carcinomas with ...
Christiana Vargas Ribeiro   +2 more
doaj   +1 more source

Dynamic analysis of double-helical gear system considering effect of oil film among meshing teeth

open access: yesAdvances in Mechanical Engineering, 2020
The oil film among meshing teeth is just like a spring-damping element, and it can dominate the friction and meshing characteristics of the gear pair and influence its dynamic performances further.
Minghu Yin   +4 more
doaj   +1 more source

Methods and tools for handling, transportation, weighing, and pelletization applied to the initial analysis of volatile components in the Hayabusa2 samples

open access: yesEarth, Planets and Space, 2022
The Hayabusa2 spacecraft succeeded in sampling and returning materials from the C-type, near-Earth asteroid (162173) Ryugu. As part of the Hayabusa2 Initial Analyses, chemical and isotopic compositions of volatile species were measured.
Ryuji Okazaki   +5 more
doaj   +1 more source

Small and hard seeds: a practical and inexpensive method to improve embedding techniques for light microscopy

open access: yesActa Botânica Brasílica, 2014
The traditional techniques employed for embedding plant samples are not suitable for the proper processing of small seeds with hard seed coats. Usually, these seeds are broken off from blocks during microtomy, which limits the technical success of this ...
Rafaella Cardoso Ribeiro   +1 more
doaj   +1 more source

Histological Studies of Mycorrhized Roots and Mycorrhizal-Like-Structures in Pine Roots [PDF]

open access: yes, 2018
Several studies have shown the potential of using Ectomycorrhizal (ECM) fungi in conifer micropropagation to overcome the cessation of adventitious root development.
Ragonezi, Carla, Zavattieri, Maria Amely
core   +2 more sources

Taxonomic study on Lindernia All. (Linderniaceae) from some parts of South Eastern Nigeria

open access: yesNotulae Scientia Biologicae, 2020
The morpho-anatomical characteristics of Lindernia diffusa var. diffusa-in E. & P., L. oliveriana (Benth.) Wettst. and L. crustacea (L.) F. Muell.) were investigated with a view of providing additional line of evidence in the delimitation of the species ...
Chimezie EKEKE   +2 more
doaj   +1 more source

Novel elucidation and treatment of pancreatic chronic graft-versus-host disease in mice [PDF]

open access: yes, 2018
Chronic graft-versus-host disease (cGVHD) is a severe complication of allogeneic haematopoietic stem cell transplantation. There is a growing understanding of cGVHD, and several effective therapies for cGVHD have been reported.
Kawakami, Yutaka   +4 more
core   +3 more sources

Tree differences in primary and secondary growth drive convergent scaling in leaf area to sapwood area across Europe [PDF]

open access: yes, 2018
open28siTrees scale leaf (AL) and xylem (AX) areas to couple leaf transpiration and carbon gain with xylem water transport. Some species are known to acclimate in AL : AX balance in response to climate conditions, but whether trees of different species ...

core   +1 more source

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