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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Cyclic autotrophic/heterotrophic cultivation of photosynthetic cells: a method of achieving continuous cell growth under light/dark cycles  [1998]

Ogbonna, J.C.; Tanaka, H.;

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Due to diurnal changes in light intensity and light/dark cycles, the number of hours in a day when the intensity of solar light energy is high enough to support photo-synthetic cell growth can be very short depending on the location and season. The night biomass loss greatly reduces the productivities of photobioreactors. As a solution to this problem, cyclic autotrophic/heterotrophic cultivation, whereby an organic carbon source is added during the night was investigated, using Chlorella sorokiniana and Euglena gracilis as examples. By adding an organic carbon source at night, both cells could change from autotrophic to heterotrophic growth and vice versa, leading to cyclic autotrophic/heterotrophic growth phases under light/dark cycles. In order to maintain the cellular photo-synthetic products high during the cultivation, it was necessary to add only the quantity of carbon source which could be completely consumed at night. Although glucose, acetate and ethanol were all good carbon sources for both cells, in the case of Euglena ethanol was the most efficient in terms of both cell growth and alpha-tocopherol accumulation. The alpha-tocopherol productivity in a cyclic autotrophic/heterotrophic culture of Euglena gracilis, using ethanol as the carbon source, was 2.9 and 1.8 times higher than the values obtained in autotrophic cultures under light/dark cycles and continuous illumination, respectively.
From the journal
Bioresource technology
ISSN : 0960-8524

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
65
Issue:
1/2
Start Page:
65
End Page:
72
All titles:
"Cyclic autotrophic/heterotrophic cultivation of photosynthetic cells: a method of achieving continuous cell growth under light/dark cycles"@eng
Other:
"Includes references"
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
65
Issue:
1/2
Start Page:
65
End Page:
72
All titles:
"Cyclic autotrophic/heterotrophic cultivation of photosynthetic cells: a method of achieving continuous cell growth under light/dark cycles"@eng
Other:
"Includes references"