Results 91 to 100 of about 2,300 (225)
Rewiring Steroidal Metabolic Pathways for Diosgenin Production in Solanum nigrum
Plant Biotechnology Journal, EarlyView.ABSTRACT Diosgenin is a key starting material for the synthesis of steroidal drugs, such as corticosteroids and sex hormones. While the primary commercial source of diosgenin is the tubers of Dioscorea spp., identifying alternative plant hosts capable of diosgenin biosynthesis could enhance its production.
Jongbu Lim +16 more
wiley +1 more source
New Progress and Future Development of PDC Bit
Shiyou jixie, 2016 A series of new PDC bits have been developed in foreign countries in order to raise rock breaking efficiency, extend bit service life and reduce trips, drilling cycle and drilling cost.
Pan Jun, Wang Minsheng, Guang Xinjun
doaj
Impact of rigid gas-permeable contact lens extended wear on corneal epithelial barrier function. [PDF]
, 2002 PurposeTo measure the effect of hypoxia and eye closure on epithelial permeability to fluorescein (P(dc)) during rigid lens extended wear (EW).MethodsCentral corneal thickness (CT) and P(dc) were measured in 42 subjects with an optical pachometer and ...
Fusaro, Robert E +3 more
core
Experimental Physiology, EarlyView.Abstract This study aimed to determine whether sodium nitrite supplementation prevented chronic stress‐induced cerebrovascular dysfunction and cognitive decline. We hypothesize that nitrite supplementation will prevent the oxidative environment and cerebrovascular dysfunction associated with chronic stress and maintain cognitive health.
Emily Burrage +10 more
wiley +1 more source
Моделювання процесу буріння долотами з алмазно-твердосплавними пластинами в реальних умовах [PDF]
, 2009 Наведено теоретичні обґрунтування процесу буріння долотами з АТП в реальних умовахПриведено теоретическое обоснование процесса бурения долотами с АТП в реальных условияхIn the article the main features of PDC drill bit working were analysed with real ...
Пригоровська, Т. О.
core
Effects of Rock/Cutter Friction on PDC Bit Drilling Performance: An Experimental and Theoretical Study. [PDF]
, 1990 A new mechanistic drilling model for PDC bits was derived from the balance of forces acting at the PDC cutter. The model combined the torque and the drilling rate equations, cutter\u27s geometry and rock properties.
Kuru, Ergun
core +2 more sources
The Journal of Physiology, EarlyView.Abstract figure legend An evaluation of the degree to which mitochondrial hydrogen peroxide emission (mH2O2)‐mediated apoptotic and necroptotic signalling contributes to skeletal muscle atrophy in an orthotopic epithelial ovarian cancer (EOC) model. To determine whether attenuating mH2O2 could prevent regulated cell death signalling and mitigate muscle
Shahrzad Khajehzadehshoushtar +15 more
wiley +1 more source
Mesoscopic Damage Simulation of Sandstone during PDC-Cutter Cutting
Shiyou jixie, 2023 In the process of rock cutting,the cutting parameters of the tool have important influences on the failure mode and rock-breaking efficiency.In order to investigate the mesoscopic damage of sandstone cut by PDC cutter under different cutting parameters ...
Yang Hongyu +4 more
doaj
Reactive imbibition of WC-Co substrate for PDC cutters used in oil and gas and mining drilling
, 2012 International audienceCemented carbides are used in rock drilling for mining tools and wear resistant parts. These composite materials possess an excellent compromise between hardness and toughness.
Berger, Marie-Hélène +4 more
core +1 more source
Cutting Efficiency of a Single PDC Cutter on Hard Rock
Canadian International Petroleum Conference, 2007 Abstract Polycrystalline diamond compact (PDC) bits have gained wide popularity in the petroleum industry for drilling soft and moderate-strength formations. However, in hard-formation applications the PDC bit still has limitations even though continuing developments in PDC cutter designs and materials have steadily
G. Hareland +3 more
openaire +2 more sources