초록
<P><B>Abstract</B></P> <P>Hydrogen (H<SUB>2</SUB>) is a renewable, abundant, and nonpolluting source of energy. Photosynthetic organisms capture sunlight very efficiently and convert it into organic molecules. Cyanobacteria produce H<SUB>2</SUB> by breaking down organic compounds and water. In this study, biological H<SUB>2</SUB> was produced from various strains of cyanobacteria. Moreover, H<SUB>2</SUB> accumulation by <I>Synechocystis</I> sp. PCC 6803 was as high as 0.037 μmol/mg Chl/h within 120 h in the dark. The wild-type, filamentous, non-heterocystous cyanobacterium <I>Desertifilum sp.</I> IPPAS B-1220 was found to produce a maximum of 0.229 μmol/mg Chl/h in the gas phase within 166 h in the light, which was on par with the maximum yield reported in the literature. DCMU at 10 μM increased H<SUB>2</SUB> production by <I>Desertifilum</I> sp. IPPAS B-1220 by 1.5-fold to 0.348 μmol H<SUB>2</SUB>/mg Chl/h. This is the first report on the capability of <I>Desertifilum</I> cyanobacterium to produce H<SUB>2</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Four non-heterocystous cyanobacterial strains were investigated for H<SUB>2</SUB> production. </LI> <LI> Best H<SUB>2</SUB> accumulation was observed with <I>Synechocystis</I> sp. PCC 6803 in the dark. </LI> <LI> Photoautotrophic H<SUB>2</SUB> production yield of <I>Desertifilum</I> sp. IPPAS B-1220 was 0.229 μmol/mg Chl/h. </LI> <LI> H<SUB>2</SUB> yield was increased with the <I>Desertifilum</I> sp. IPPAS B-1220 by 1.5-fold in the presence of DCMU. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>