| Project/Area Number |
09555075
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 展開研究 |
|---|
| Research Field |
Thermal engineering
|
|---|
| Research Institution | Keio University |
|---|
Principal Investigator |
TANISHITA Kazuo Keio University, Faculty Sci.Tech., Professor, 理工学部, 教授 (10101776)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
FURUUNE Hiroyui La Foret Engineering Co.Ltd., Chief researcher, 主任研究員
IKEDA Mariko Keio University, Dept.of Biology, Professor, 文学部・生物学, 教授 (00051368)
NAGASAKA Yuji Keio University, Faculty Sci.Tech., Professor, 理工学部, 教授 (40129573)
TSUGE Hideki Keio University, Faculty Sci.Tech., Professor, 理工学部, 教授 (70051688)
OKA Kotaro Keio University, Faculty Sci.Tech., Associate Professor, 理工学部, 助教授 (10276412)
|
|---|
| Project Period (FY) |
1997 – 1998
|
| Project Status |
Completed (Fiscal Year 1998)
|
| Budget Amount *help |
¥13,100,000 (Direct Cost: ¥13,100,000)
Fiscal Year 1998: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1997: ¥10,300,000 (Direct Cost: ¥10,300,000)
|
|---|
| Keywords | carbon dioxide fixation / microalgae / photosynthesis / fluorescent reflector / photo-reactor / improvement of photosynthesis / light environment |
|---|
| Research Abstract |
we designed the new reactor with reflectors to reduce the energy loss of the light source and propose the fluorescent reflector that shifts wavelength from green region to red region for effective photosynthesis. In present study, we evaluated the effect of a bioreactor using silver reflector (5-Ref.) and fluorescent reflector (F-Ref.) on photosynthetic rates, and investigated the influence of spectral shifting by fluorescent reflector on algal cells.
Base polyethylene terephthalate (PET) sheet was sputtered with silver and covered with PET film as a S-Ref. (94%Reflectivity). As a F-Ref. (59%Reflectivity), fluorescent dye (Lumogen F-Red 300, BASF Japan Ltd.) was coated on the S-Ref. A black curtain was used as control. Coaxial double tubular photobioreactors were used for measurements, which contain light sources inside and algal culture outside (light path of algal suspension is 2.3 mm) and were covered with these reflectors with perfusing culture of green algae Chlorella vulgaris IAM
… More
C-27. After preculture of 3 days, the algal culture were perfused in the photobioreactors. Oxygen production was measured as photosynthetic rates. As influence of spectral shifting by fluorescent reflector on algal cells, cell concentration, cell volume and absorption spectrum were measured during 8 days.
At 40W/m2 irradiation in control, in spite of five-fold increase of cell concentration (=0.344g/l), O2 production rate rose only 1.7-fold. But S-Ref. rose 2.3-fold 02 production rate in control (cell concentration=O.344 g/l), and 2.0-fold in F-Ref. So these reflectors, especially S-Ref. Utilizes energy more efficiently. However F-Ref. was superior to S-Ref. with 1.7 times in O2 production rate per reflected light energy, in which the spectral shifting by F-Ref. is effective for photosynthesis. Although the growth curve of S-Ref. is similar to one of S-Ref., the composition of the cells after 16 hrs is different : mother cells are dominant in S-Ref., and daughter cells are dominant in F-Ref. These result imply that the red light accelerated the cell fission, and the small daughter cells (high surface / volume ratio) also improve the lighting condition in the bioreactor. Less
|
