Results 21 to 30 of about 60,361 (264)
Effect of contact angle and helix angle on slide-roll ratio under the uniform motion state of BSM
MATEC Web of Conferences, 2017 To study the effect of contact and helix angles on slide-roll ratio at the ball contact point under the uniform motion state of ball screw mechanism (BSM), a slide- roll ratio model was derived in the literature [9] were used in this paper.
Deshun Kong, Min Wang, Xiangsheng Gao
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A Parametric Study on the Performance of a Helical Type of Internally Finned Tube
Engineering Proceedings, 2023 We study the performance of a helical type of internally finned tube (HIFT), using computational fluid dynamics (CFD) to obtain optimal temperature uniformity and reduce the pressure drop. In comparison with a bare tube, the HIFT improved the temperature
Chun-Lang Yeh +5 more
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The effect of the superhelicity on the double helix twist angle in DNA
Nucleic Acids Research, 1979 An attempt to estimate the relative contributions of twisting and bending to the free energy of superhelix formation from the relaxed DNA is undertaken. The extent of teritiary ordering (number of DNA axis turns tau) and that of secondary ordering (duplex twist angle beta) have been taken as thermodynamical parameters, which characterize the state of ...
B N, Belintsev +2 more
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Refining the RNA Force Field with Small-Angle X-ray Scattering of Helix–Junction–Helix RNA
The Journal of Physical Chemistry Letters, 2022 The growing recognition of the functional and therapeutic roles played by RNA and the difficulties in gaining atomic-level insights by experiments are paving the way for all-atom simulations of RNA. One of the main impediments to the use of all-atom simulations is the imbalance between the energy terms of the RNA force fields.
Weiwei He +3 more
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Leakage Characteristic of Helical Groove Seal Designed in Reactor Coolant Pump
International Journal of Rotating Machinery, 2012 Helical groove seal is designed in reactor coolant pump to control the leakage along the front surface of the impeller face due to its higher resistance than the circumferentially grooved seal.
Meng Zhang +3 more
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Calpain small subunit homodimerization is robust and calcium‐independent
FEBS Letters, EarlyView.Calpains dimerize via penta‐EF‐hand (PEF) domains. Using single‐molecule force spectroscopy, we measured the strength and kinetics of PEF–PEF homodimer binding. The interaction is robust, shows a transient conformational step before dissociation, and remains largely insensitive to Ca2+.
Nesha May O. Andoy +4 more
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A numerical investigation of heat transfer and pressure drop in a novel cylindrical heat sink with helical minichannels [PDF]
Journal of Heat and Mass Transfer Research, 2018 This study numerically investigated heat transfer and fluid flow characteristics in a novel cylindrical heat sink with helical minichannels for the laminar flow of fluid with temperature-dependent properties. A finite volume method was employed to obtain
Alireza Falahat +2 more
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FEBS Letters, EarlyView.Ascidian Ciona larvae initially show strong clockwise tail twisting, which is largely corrected during development. However, a small residual twist remains. This study shows that organized helical myofibrils in tail muscles mechanically stabilize this residual asymmetry, preventing complete restoration of bilateral symmetry and revealing how embryos ...
Yuki S. Kogure +3 more
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Transmembrane Helix Uniformity Examined by Spectral Mapping of Torsion Angles [PDF]
Structure, 2008 The environment and unique balance of molecular forces within lipid bilayers has a profound impact upon the structure, dynamics, and function of membrane proteins. We describe the biophysical foundations for the remarkable uniformity of many transmembrane helices that result from the molecular interactions within lipid bilayers.
Page, RC, Kim, S, Cross, TA
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Conserved binding mode but diverse interfaces of MreC‐PBP2 interactions
FEBS Letters, EarlyView.The crystal structure of abMreC reveals a conserved two β‐barrel architecture and provides structural insights into its role within the bacterial elongasome. The abMreC–abPBP2 complex model identifies the molecular basis of MreC‐mediated PBP2 recognition, contributing to the regulation of peptidoglycan synthesis.
Hyunseok Jang +4 more
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