Fluorescence technique for on-line monitoring of state of hydrogen-producing microorganisms
US7229785B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2002 |
| Grant date | Jun 12, 2007 |
| Priority date | — |
| Expiry date | Apr 16, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2333/90212
- WIPO fieldBiotechnology
- WIPO sectorChemistry
Abstract
In situ fluorescence method to monitor state of sulfur-deprived algal culture's ability to produce H2 under sulfur depletion, comprising: a) providing sulfur-deprived algal culture; b) illuminating culture; c) measuring onset of H2 percentage in produced gas phase at multiple times to ascertain point immediately after anerobiosis to obtain H2 data as function of time; and d) determining any abrupt change in three in situ fluorescence parameters; i) increase in Ft (steady-state level of chlorophyll fluorescence in light adapted cells); ii) decrease in Fm′, (maximal saturating light induced fluorescence level in light adapted cells); and iii) decrease in ΔF/Fm′=(Fm′−Ft)/Fm′ (calculated photochemical activity of photosystem II (PSII) signaling full reduction of plastoquinone pool between PSII and PSI, which indicates start of anaerobic conditions that induces synthesis of hydrogenase enzyme for subsequent H2 production that signal oxidation of plastoquinone pool asmain factor to regulate H2 under sulfur depletion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.