Results 71 to 80 of about 388,588 (308)
FEBS Letters, EarlyView.We reconstituted Synechocystis glycogen synthesis in vitro from purified enzymes and showed that two GlgA isoenzymes produce glycogen with different architectures: GlgA1 yields denser, highly branched glycogen, whereas GlgA2 synthesizes longer, less‐branched chains.
Kenric Lee +3 more
wiley +1 more source
Structural Design and Test of ROP Improving Tool with Adjustable Impact Frequency
Shiyou jixieRocks below the Permian are less drillable, leading to low rate of penetration(ROP), which can hardly be improved by only applying the drilling tool with single impact frequency.In this study, a ROP improving tool with adjustable impact frequency was ...
Tian Yu +5 more
doaj
PDC Bit Optimization and Application in Panyu Oilfield of the South China Sea
Shiyou jixie, 2016 Panyu Oilfield of the South China Sea is subject to several technical problems.For example, soft and hard formations are repeatedly staggered to possibly damage drill bits and tools; plastic soft clay is prone to bit balling; high requirements are raised
Tian Zhixin, Liu Jun
doaj
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
wiley +1 more source
Dynamics of Circumferential Torque Hydraulic Shock Generator
Shiyou jixie, 2015 The circumferential torque hydraulic shock generator may effectively inhibit "stuck and slip" during the process of drilling operations.This paper presents the structure and principles of the circumferential torque hydraulic shock generator,and provides ...
Li Meiqiu +4 more
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Evolution of penetration mechanism induced by strain rate effect
EPJ Web of Conferences, 2018 According to the dynamic mechanical properties, in the striking velocity range, the strain rate of the projectile and target caused by penetration can reach 104~106 /s. The strain rate effect increases sharply and then tends to saturation.
Li Gan, Song Chunming, Wang Mingyang
doaj +1 more source
Factors Affecting Penetration Rate
Journal of the Japanese Association for Petroleum Technology, 1965 By the use of drilling records taken in oil fields in Japan, the factors affecting penetration rate of a rotary drilling were analysed. Some of the results obtained are as follows: (1) In some fields there is a relationship between load on a bit and penetration rate both for vertical wells and directional wells drilled with a vertical deviation angle ...
openaire +2 more sources
The Journal of General Physiology, 1927 When living cells of Nitella are exposed to a solution of sodium acetate and are then placed in a solution of brilliant cresyl blue made up with a borate buffer mixture at pH 7.85, a decrease in the rate of penetration of dye is found, without any change
M. Irwin
semanticscholar +1 more source
Structural insights into an engineered feruloyl esterase with improved MHET degrading properties
FEBS Letters, EarlyView.A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa +5 more
wiley +1 more source
Structural Design and Performance Analysis of Novel Torsional Impact Tool
Shiyou jixie, 2017 The existing impact and rotary-impact rock breaking technology mostly use the axial impact and the shear action of the PDC bit to achieve high-efficiency rock breaking, but excessive axial force will cause the failure of PDC bit shear force, resulting in
Fu Chuanhong +5 more
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