Pigment composition and concentrations within the plant (Ceratophyllum demersum L.) component of the STS-89 C.E.B.A.S. Mini-Module spaceflight experiment.

The Closed Equilibrated Biological Aquatic System (C.E.B.

The "C.E.B.A.S. MINI-MODULE": a self-sustaining closed aquatic ecosystem for spaceflight experimentation.

The C.E.B.

The C.E.B.A.S.-Minimodule: behaviour of an artificial aquatic ecological system during spaceflight.

The C.E.B.

The closed equilibrated biological aquatic system: a 12 months test of an artificial aquatic ecosystem.

The Closed Equilibrated Biological Aquatic System" (C.E.B.

Novel laboratory approaches to multi-purpose aquatic bioregenerative closed-loop food production systems.

Based on the construction principle of the Closed Equilibrated Biological Aquatic System (C.E.B.

The Closed Equilibrated Biological Aquatic System: general concept and aspects of botanical research.

The Closed Equilibrated Biological Aquatic System (CEBAS) consists of four subcomponents which form a closed (artificial) aquatic ecosystem initially designed to study the long-term influence of space conditions on several successive generations of aquatic organisms. Teleost fishes and water snails in the zoological component produce CO2 ammonium ions and waste compounds which can be utilized after ammonium is oxidised in a microbial component by the botanical component consisting of a rootless, aquatic higher plant species which eliminates ions, i.e.

A regeneration protocol for sunflower (Helianthus annuus L.) protoplasts.

Hypocotyl protoplasts of four different Helianthus annuus genotypes were cultivated for 22-28 days in agarose droplets covered with liquid medium. In the first week, supplementation of the medium with plant growth regulators was at a 0.8/1 ratio of cytokinin and auxin followed by a high auxin concentration in the second week and a cytokinin to auxin ratio of 8/1 in the third and fourth week.

Electrofusion of plant cell protoplasts under microgravity--a D-2 spacelab experiment.

Plant cell protoplasts, derived from sexually incompatible plant species, have proved to be a good system for somatic hybridization by electrofusion. Under microgravity, an increase in fusion yield can be expected, especially if the parental cells differ markedly in size or specific density. On the D-2 spacelab mission flown in 1993, electrofusion experiments were performed with three different objects, i.