title: Real-time studies on microalgae under microgravity.
abstract: Using remote sensing technique, we investigated real-time Nostoc sphaeroides Kütz (Cyanobacterium) in Closed System under microgravity by SHENZHOU-2 spacecraft in January 2001. The experiments had 1 g centrifuges in space for control and ground control group experiments were also carried out in the same equipments and under the same controlled condition. The data about the population growth of Nostoc sp. of experiments and temperature changes of system were got from spacecraft every minute. From the data, we can find that population growth of Nostoc sp. in microgravity group was higher than that of other groups in space or on ground, even though both the control 1 g group in space and 1 g group on ground indicated same increasing characteristics in experiments. The growth rate of 1.4 g group (centrifuged group on ground) was also promoted during experiment. The temperature changes of systems are also affected by gravity and light. Some aspects about those differences were discussed. From the discussion of these results during experiment, it can be found that gravity is the major factor to lead to these changes.
authors.affiliation: Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan, China.
authors.forename: G H
authors.initials: GH
authors.lastname: Wang
authors.forename: G B
authors.initials: GB
authors.lastname: Li
authors.forename: D H
authors.initials: DH
authors.lastname: Li
authors.forename: Y D
authors.initials: YD
authors.lastname: Liu
authors.forename: L R
authors.initials: LR
authors.lastname: Song
authors.forename: G H
authors.initials: GH
authors.lastname: Tong
authors.forename: X M
authors.initials: XM
authors.lastname: Liu
authors.forename: E T
authors.initials: ET
authors.lastname: Cheng
mesh_terms: D002245:Carbon Dioxide / Q000378:metabolism; D002498:Centrifugation; D015169:Colony Count, Microbial; D018504:Ecological Systems, Closed; D006112:Gravitation; D008021:Life Support Systems; D008027:Light; D046937:Nostoc / Q000254:growth & development* / Q000502:physiology / Q000528:radiation effects; D013026:Space Flight; D013696:Temperature; D014893:Weightlessness
chemical_list: D002245:Carbon Dioxide