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D Helwig

Publications and source records attributed to D Helwig.

At least 19 recordsLinked to original sources
PubMed1996

Cosmos 2229 mission. Overview.

The Cosmos 2229 unmanned biosatellite was launched from the Plesetsk Cosmodrome in northern Russia on December 29, 1992. This was the 10th Russia-sponsored international mission dedicated to space biology and marked the 8th mission with United States participation. The payload, which orbited the Earth for 11 days 16 h, included two rhesus monkeys; the papers that follow report studies on these monkeys.

Adaptation, Physiological↗
PubMed1992

Vestibuloocular reflex of rhesus monkeys after spaceflight.

The vestibuloocular reflex (VOR) of two rhesus monkeys was recorded before and after 14 days of spaceflight. The gain (eye velocity/head velocity) of the horizontal VOR, tested 15 and 18 h after landing, was approximately equal to preflight values. The dominant time constant of the animal tested 15 h after landing was equivalent to that before flight. During nystagmus induced by off-vertical axis rotation (OVAR), the latency, rising time constant, steady-state eye velocity, and phase of modulation in eye velocity and eye position with respect to head position were similar in both monkeys before and after flight. There were changes in the amplitude of modulation of horizontal eye velocity during steady-state OVAR and in the ability to discharge stored activity rapidly by tilting during postrotatory nystagmus (tilt dumping) after flight: OVAR modulations were larger, and tilt dumping was lost in the one animal tested on the day of landing and for several days thereafter. If the gain and time constant of the horizontal VOR change in microgravity, they must revert to normal soon after landing. The changes that were observed suggest that adaptation to microgravity had caused alterations in way that the central nervous system processes otolith input.

Animals↗