Results 81 to 90 of about 1,527,027 (341)

Characterization of domestic high performance carbon fibers and mechanical properties of carbon fibers reinforced matrix composites

open access: yesCailiao gongcheng, 2020
The morphologies and surface chemical properties of domestic T800 grade carbon fibers A and imported Toray T800H were characterized by means of scanning electronic microscopy(SEM), atomic force microscope (AFM) and X-ray photoelectron spectroscopy (XPS).
LI Guo-li, PENG Gong-qiu, ZHONG Xiang-yu
doaj   +1 more source

Molecular bases of circadian magnesium rhythms across eukaryotes

open access: yesFEBS Letters, EarlyView.
Circadian rhythms in intracellular [Mg2+] exist across eukaryotic kingdoms. Central roles for Mg2+ in metabolism suggest that Mg2+ rhythms could regulate daily cellular energy and metabolism. In this Perspective paper, we propose that ancestral prokaryotic transport proteins could be responsible for mediating Mg2+ rhythms and posit a feedback model ...
Helen K. Feord, Gerben van Ooijen
wiley   +1 more source

Peptide‐based ligand antagonists block a Vibrio cholerae adhesin

open access: yesFEBS Letters, EarlyView.
The structure of a peptide‐binding domain of the Vibrio cholerae adhesin FrhA was solved by X‐ray crystallography, revealing how the inhibitory peptide AGYTD binds tightly at its Ca2+‐coordinated pocket. Structure‐guided design incorporating D‐amino acids enhanced binding affinity, providing a foundation for developing anti‐adhesion therapeutics ...
Mingyu Wang   +9 more
wiley   +1 more source

Composite propellant technology research: Mechanical property characterization [PDF]

open access: yes
Proof for the existence of a single Poisson's ratio function in isotropic linear viscoelastic materials is presented. An in-depth discussion is given of three dimensional viscoelastic material properties and their relationships to linear isotropic and ...
Bower, Mark V.
core   +1 more source

Some general aspects of thin-shell wormholes with cylindrical symmetry [PDF]

open access: yes, 2010
In this article we study a general class of non-rotating thin-shell wormholes with cylindrical symmetry. We consider two physically sound definitions of the flare-out condition and we show that the less restrictive one allows for the construction of ...
Eiroa, Ernesto F., Simeone, Claudio
core   +3 more sources

Real‐time assay of ribonucleotide reductase activity with a fluorescent RNA aptamer

open access: yesFEBS Letters, EarlyView.
Ribonucleotide reductases (RNR) synthesize DNA building blocks de novo, making them crucial in DNA replication and drug targeting. FLARE introduces the first single‐tube real‐time coupled RNR assay, which enables isothermal tracking of RNR activity at nanomolar enzyme levels and allows the reconstruction of allosteric regulatory patterns and rapid ...
Jacopo De Capitani   +4 more
wiley   +1 more source

Measurement of mechanical and thermophysical properties of dimensionally stable materials for space applications [PDF]

open access: yes
Mechanical, thermal, and physical property test data was generated for as-fabricated advanced composite materials at room temperature (RT), -150 and 250 F.
Misra, Mohan S., Rawal, Suraj P.
core   +1 more source

Relation between the Dynamics of the Reduced Purity and Correlations

open access: yes, 2009
A general property of the relation between the dynamics of the reduced purity and correlations is investigated in quantum mechanical systems. We show that a non-zero time-derivative of the reduced purity of a system implies the existence of non-zero ...
Attal S.   +6 more
core   +1 more source

First-Principles Investigation of Perfect and Diffuse Anti-Phase Boundaries in HCP-Based Ti-Al Alloys [PDF]

open access: yes, 2002
First-principles thermodynamic models based on the cluster expansion formalism, monte-carlo simulations and quantum-mechanical total energy calculations are employed to compute short-range-order parameters and diffuse-antiphase-boundary energies in hcp ...
Asta, M., van de Walle, A.
core   +3 more sources

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