Results 161 to 170 of about 1,001,571 (236)

Trail Management Terminology and Decision-Making: A Conceptual and Practical Framework. [PDF]

Environ Manage
de Castro Simão MVR, Llena M, Farías-Torbidoni EI.   +2 more
europepmc   +1 more source

Sensing the good vibes: Audience vocal engagement with the oral microbiota. [PDF]

iScience
Spiess K.
europepmc   +1 more source

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Closed Ecological Systems

Journal of Biological Education, 1994
Closed Ecological Systems (CES), i.e. biological systems closed to material but open to energy exchange, have been unexplored as biological tools. Only the investigations of bioregenerative Life Support systems For space missions have created some activity. However, these systems also have enormous potential applications on Earth.
Christian Tamponnet, Christopher Savage
openaire   +2 more sources

Biosphere II: Engineering of Manned, Closed Ecological Systems

Journal of Aerospace Engineering, 1991
Space Biospheres and Ventures, a private, for-profit firm, has undertaken a major research and development project in the study of biospheres, with the objective of creating and producing biospheres. Biosphere II-scheduled for completion in March 1991-will be essentially isolated from the existing biosphere by a closed structure, composed of components
W. Dempster
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Pressure, O2, and CO2, in aquatic Closed Ecological Systems

Advances in Space Research, 2013
Abstract Pressure increased during net photosynthetic O2 production in the light and decreased during respiratory O2 uptake during the dark in aquatic Closed Ecological Systems (CESs) with small head gas volumes. Because most CO2 will be in the liquid phase as bicarbonate and carbonate anions, and CO2 is more soluble than O2, volumes of gaseous CO2 ...
Frieda B. Taub, Anna K. McLaskey
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Microbial and higher plant biomass selection for closed ecological systems

Acta Astronautica, 1992
A selection of higher plants and microbial strains is presented with its rationale in order to progressively regenerate food from waste in future space and planetary missions.
C, Tamponnet, R A, Binot
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Closed Ecological Systems, Space Life Support and Biospherics

2010
This chapter explores the development of a new type of scientific tool – man-made closed ecological systems. These systems have had a number of applications within the past 50 years. They are unique tools for investigating fundamental processes and interactions of ecosystems.
Mark Nelson, Nickolay S. Pechurkin, John P. Allen, Lydia A Somova, Josef I. Gitelson   +4 more
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Key ecological challenges for closed systems facilities

Advances in Space Research, 2013
Abstract Closed ecological systems are desirable for a number of purposes. In space life support systems, material closure allows precious life-supporting resources to be kept inside and recycled. Closure in small biospheric systems facilitates detailed measurement of global ecological processes and biogeochemical cycles.
Mark Nelson, William F. Dempster, John P. Allen   +2 more
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Eucaryote/procaryote ratio as an indicator of stability for closed ecological systems

Biosystems, 1983
The eukaryote/prokaryote ratio permits immediate and direct estimation of ecological stability in closed microbial ecosystems as well as in natural systems. Previous research demonstrated partial pressure of oxygen can be used as a long term indicator of stability (Kearns and Folsome , 1981).
D C, Obenhuber, C E, Folsome
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Community metabolism of aquatic Closed Ecological Systems: Effects of nitrogen sources

Advances in Space Research, 2009
Abstract To investigate the effect of nitrogen sources on Closed Ecological Systems (CESs), three nitrogen sources (NaNO 3 , sodium nitrate; NH 4 Cl, ammonium chloride; and NH 4 NO 3 , ammonium nitrate) were each tested in freshwater CESs consisting of a chemically defined medium, three species of green algae ( Ankistrodesmus , S cenedesmus , and ...
F. Taub
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