000			02255nam a2200181Ia 4500
003			MX-MdCICY
005			20250625140653.0
040			_cCICY
090			_aB-11611
245	1	0	_aNovel Mode of Microbial Energy Metabolism: Organic Carbon Oxidation Coupled to Dissimilatory Reduction of Iron or Manganese
490	0		_vApplied and Environmental MicroBiology, 54(6), p.1472-1480, 1988
520	3		_aA dissimilatory Fe(III)- and Mn(IV)-reducing microorganism was isolated from freshwater sediments of the Potomac River, Maryland. The isolate, designated GS-15, grew in defined anaerobic medium with acetate as the sole electron donor and Fe(III), Mn(IV), or nitrate as the sole electron acceptor. GS-15 oxidized acetate to carbon dioxide with the concomitant reduction of amorphic Fe(III)oxide to magnetite (Fe3O4). When Fe(III)citrate replaced amorphic Fe(III)oxide as the electron acceptor, GS-15 grew faster and reduced all of the added Fe(III)to Fe(II). GS-15 reduced a natural amorphic Fe(III)oxide but did not significantly reduce highly crystalline Fe(III)forms. Fe(III)was reduced optimally at pH 6.7 to 7 and at 30 to 35°C. Ethanol, butyrate, and propionate could also serve as electron donors for Fe(III)reduction. A variety of other organic compounds and hydrogen could not. MnO2 was completely reduced to Mn(II), which precipitated as rhodochrosite (MnCO3). Nitrate was reduced to mmonia. Oxygen could not serve as an electron acceptor, and it inhibited g rowth with the other electron acceptors. This is the first demonstration that microorganisms can completely oxidize organic compounds with Fe(III)or Mn(IV)as the sole electron acceptor and that oxidation of organic matter coupled to dissimilatory Fe(III)or Mn(IV)reduction can yield energy for microbial growth. GS-15 provides a model for how enzymatically catalyzed reactions can be quantitatively significant mechanisms for the reduction of iron and manganese in anaerobic environments.
700	1	2	_aLovley, D.R.
700	1	2	_aPhillips, E.J.P.
856	4	0	_uhttps://drive.google.com/file/d/1NHehtJdvrTp5NGstmvTOGxcDW5I1yQJf/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
942			_2Loc _cREF1
008			250602s9999 xx |||||s2 |||| ||und|d
999			_c45827 _d45827