1
|
|
2
|
Ariff A, Salleh M, Ghani B, Hassan M, Rusul G, Karim M. Aeration and yeast extract requirements for kojic acid production by Aspergillus flavus link. Enzyme Microb Technol 1996. [DOI: 10.1016/s0141-0229(96)00065-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
3
|
Ghani B, Takai M, Hisham NZ, Kishimoto N, Ismail AK, Tano T, Sugio T. Isolation and Characterization of a Mo
6+
-Reducing Bacterium. Appl Environ Microbiol 1993; 59:1176-80. [PMID: 16348915 PMCID: PMC202257 DOI: 10.1128/aem.59.4.1176-1180.1993] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A Mo
6+
-reducing bacterium (strain 48), which grew on medium supplemented with 200 mM Mo
6+
, was isolated from stream water obtained from Chengkau, Malaysia. The chemical properties of strain 48 conform to the characteristics of
Enterobacter cloacae
. Under anaerobic conditions in the glucose-yeast extract medium containing phosphate ion (2.9 mM) and Mo
6+
(10 mM), the bacterium reduced Mo
6+
to form molybdenum blue. Approximately 27% of Mo
6+
added to the medium was reduced after 28 h of cultivation. The reduction of Mo
6+
with glucose as an electron donor was strongly inhibited by iodoacetic acid, sodium fluoride, and sodium cyanide, suggesting an involvement of the glycolytic pathway and electron transport in Mo
6+
reduction. NADH and
N,N,N′,N′
-tetramethyl-
p
-phenylenediamine served as electron donors for Mo
6+
reduction. When NADH was used as an electron donor, at first cytochrome
b
in the cell extract was reduced, and then molybdenum blue was formed. Sodium cyanide strongly inhibited Mo
6+
reduction by NADH (5 mM) but not the reduction of cytochrome
b
in the cell extract, suggesting that the reduced component of the electron transport system after cytochrome
b
serves as an electron donor for Mo
6+
reduction. Both ferric and stannous ions strongly enhanced the activity of Mo
6+
reduction by NADH.
Collapse
Affiliation(s)
- B Ghani
- Department of Biotechnology, Universiti Pertanian Malaysia, 43400 Serdang, Selangor, Malaysia
| | | | | | | | | | | | | |
Collapse
|