The 6 September 2017 X-Class Solar Flares and Their Impacts on the Ionosphere, GNSS, and HF Radio Wave Propagation.

On 6 September 2017, the Sun emitted two significant solar flares (SFs). The first SF, classified X2.2, peaked at 09:10 UT.

[Protective reaction of brain cells during change in permeability of the blood-brain barrier].

General anesthesia carried out in neurosurgical operations caused liberation of neurospecific proteins into blood. High content of these antigens was maintained in biological fluids within 7 days, which occurred apparently due to activation of biosynthesis. Antibodies to the antigens were detected only within 21 days after the surgical intervention.