TITLE:
Gravireception in Phycomyces: Threshold Determination on the Sounding Rocket TEXUS 50
AUTHORS:
Werner Schmidt
KEYWORDS:
MDWS (Micro-Dual Wavelength Spectrophotometer), Δ GIAC (Differential Gravity-Induced Absorption Change), Phycomyces blakesleeanus, Sporangiophore, Micro- and Hypergravity, Texus 50, Sounding Rocket, Gravireception
JOURNAL NAME:
Journal of Modern Physics,
Vol.6 No.10,
August
28,
2015
ABSTRACT: Under parabolic flight conditions microgravity is not lower than 3 to 5 times 10-2 g. In contrast to parabolic flights, sounding rocket flights are virtually vibrational-free allowing microgravity as low as 10-5 g. Thus, a rotating platform serving as centrifuge allows the precise generation of gravitational forces ranging from 5 to 100 mg (not possible during parabolic flights). On this basis we determined the threshold1 for optical reflection/absorption changes in Phycomyces to be lower than 25 × 10-3 g. This compares well with the threshold determination of gravitropism in Phycomyces on a clinostat centrifuge. Kinetics of gravity-induced absorption changes and gravity as generated by the on-board centrifuge do not coincide but show a distinctive hysteresis with a latency of 4 s (75 mg-ramp, pull-up).