Results 81 to 90 of about 22,534,897 (356)
Chronic Hypoxia Disrupts Spermatogenesis Through ASXL2–EZH2–Mediated Microtubule Destabilization
Advanced Science, EarlyView.This study reveals the mechanism by which chronic hypoxia impairs spermatogenesis via the ASXL2–EZH2 axis, hindering the transition of spermatids from round to elongated forms. Key findings reveal that under hypoxic conditions, downregulated ASXL2 expression reduces EZH2 binding to the CEP162 promoter, leading to decreased H3K27me3 modification and ...
Jun Yin +11 more
wiley +1 more source
High altitude reconnaissance aircraft [PDF]
At the equator the ozone layer ranges from 65,000 to 130,000 plus feet, which is beyond the capabilities of the ER-2, NASA's current high altitude reconnaissance aircraft.
Moller, David, Yazdo, Renee Anna
core +4 more sources
Experimental Biology and Medicine, 1968 SummaryFifteen normal male and 15 normal female subjects living permanently at a mining town located at an altitude of 14,000 ft in the central Andean plateau demonstrated elevations of the values of serum urate, creatinine, and hematocrit when compared with equal numbers of normal subjects living at sea level. Of the HA male group, three subjects (20%)
L A, Sobrevilla, F, Salazar
openaire +2 more sources
Evolved Mechanisms of Aerobic Performance and Hypoxia Resistance in High-Altitude Natives.
Annual Review of Physiology, 2019 Comparative physiology studies of high-altitude species provide an exceptional opportunity to understand naturally evolved mechanisms of hypoxia resistance.
G. McClelland, G. Scott
semanticscholar +1 more source
Thermal Plasticity is Regulated by a Key MicroRNA During Range Expansion of an Invasive Fruit Fly
Advanced Science, EarlyView.Populations at the invasion front of Bactrocera dorsalis adapt through reduced phenotypic and gene expression plasticity, a phenomenon likely to be driven by genetic assimilation. We identify a key miRNA‐mediated regulatory axis, in which miR‐276b post‐transcriptionally represses thw, a conserved chitin‐binding gene critical to the cold‐tolerance ...
Yan Zhao +5 more
wiley +1 more source
Frontiers in PhysiologyBackground: Both hypoxia exposure and physical exercise before ascending have been proved to promote high altitude acclimatization, whether the combination of these two methods can bring about a better effect remains uncertain.
Jiaxin Xie +9 more
doaj +1 more source
Di-san junyi daxue xuebao, 2019 Objective To study the effects of nitric oxide (NO) inhalation on oxygen-carrying capacity of red blood cells and hypoxia tolerance in mice. Methods Peripheral blood from 8-week-old male mice was exposed to nitrogen gas containing NO in an oxygenation ...
SU Wenting +3 more
doaj +1 more source
Astronomical Site Ranking Based on Tropospheric Wind Statistics
, 2004 We present comprehensive and reliable statistics of high altitude wind speeds and the tropospheric flows at the location of five important astronomical observatories.
B. García-Lorenzo +16 more
core +1 more source
Study of the winter 2005 Antarctica polar vortex [PDF]
, 2009 During winter and springtime, the flow above Antarctica at high altitude (upper troposphere and stratosphere) is dominated by the presence of a vortex centered above the continent. It lasts typically from August to November.
E. Masciadri +7 more
core +1 more source
Advanced Science, EarlyView.Bacterial α‐diversity decreases, but stochasticity and community stability increase across the 15 m‐depth vertical profiles and along the degraded gradient within the active layer. The abundance and interaction of core taxa mainly control community stability in the active and permafrost layers, respectively.
Shengyun Chen +13 more
wiley +1 more source