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HEFLEX Bioengineering Test (HBT)

NSSDCA ID: 1981-111A-07

Mission Name: STS 2/OSTA 1
Principal Investigator:Dr. Allan H. Brown


The objective of the Heflex Bioengineering Test (HBT) was to determine the effect of near weightlessness and soil content on Helianthus annus (dwarf sunflower) growth. The HBT was a precursor to the Heflex (Helianthus Annus Flight Experiment) planned on Spacelab 1. The HBT experiment was a suitcase-like container loaded with 85 sealed plant modules varying in soil moisture content from 55% by weight to 77%. This plant carry-on was stored in a locker in the crew compartment of the Space Shuttle. There was insufficient time for the plants to grow because of the shortened mission. Germination percentage was 98%, but the data relating to growth required to support the Spacelab 1 experiment were not obtained.

Alternate Names

  • HBT


  • Life Science: None assigned

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. Allan H. BrownPrincipal InvestigatorUniversity of Pennsylvania
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