Publications by authors named "J Stepanek"

Recently published observations have highlighted the presence of cruciform structures within the genome, suggesting their potential significance in the rapid recognition of the target sequence for transcription factor binding. In this study, we investigate the organization and stability of the (coding) strand within the Serum Response Element of the gene promoter ( SRE), specifically focusing on segments spanning 12 to 36 nucleotides, centered around the CArG-box. Through a thorough examination of UV absorption patterns with varying temperatures, we identified the emergence of a remarkably stable structure, which we conclusively characterized as a hairpin using complementary H NMR experiments.

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Introduction: The sharpened Romberg test (SRT) is a physical maneuver that has been used to identify ataxia in individuals in resource-limited settings. Previous research has suggested that performance on balance testing may be affected by hypocapnia. In this study, we sought to determine whether acute hyperventilation-induced hypocapnia affects performance on the SRT at 501 meters above sea level.

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Article Synopsis
  • Decompression sickness (DCS) occurs when dissolved nitrogen forms bubbles in the body due to rapid ascent, affecting divers and aviators, with cutaneous DCS (also known as cutis marmorata) appearing as a distinct skin rash.
  • A systematic review of 31 studies involving 128 patients revealed that 84% had evidence of a right-to-left shunt (RLS) and cutaneous DCS, with some patients successfully undergoing closure of the RLS to prevent recurrence.
  • The coexistence of CM and neurological symptoms was noted in over half of the evaluated patients, supporting the theory that CM may indicate a risk for more serious complications and urging a reevaluation of its clinical importance.
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  • High altitude can reduce oxygen levels, causing problems like shortness of breath and fatigue for some people.
  • A special test called Hypoxic Simulation Testing (HST) was used to see how the heart reacts to lower oxygen levels.
  • The study found that many patients had increased pressure in their heart, and some even had blood flow issues only noticed during low oxygen conditions, which could explain their breathing problems at high altitudes.
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Human spaceflight is entering a time of markedly increased activity fueled by collaboration between governmental and private industry entities. This has resulted in successful mission planning for destinations in low Earth orbit, lunar destinations (Artemis program, Gateway station) as well as exploration to Mars. The planned construction of additional commercial space stations will ensure continued low Earth orbit presence and destinations for science but also commercial spaceflight participants.

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