000			nab a22 a 4500
999			_c65963 _d65963
003			ENAL
008			200916s2020 ua ss ||| | eng d
040			_aEAL _cEAL
041			_aeng _bara
090			_aART EJM V55 NO1 2
100	1		_aYoughly, Nesma A. _932343
240	1	0	_aEgyptian journal of microbiology, 2020 v.55 (1) _h[electronic resource].
245	1	0	_aBioaccumulation of chromium by autochthonous bacteria associated with the heavy metal- resistant Halophyte Arthrocnemum Macrostachyum _h[electronic resource].
300			_ap. 15-26.
504			_aIncludes references.
520			_aArthrocnemum macrostachyum is a halophyte naturally growing on Manzala Lake shoreline of Egypt and able to tolerate and accumulate heavy metals. The use of metal-resistant rhizobacteria is an important technology to improve the tolerance capability of the halophytes in metal-polluted environments. A total of 33 bacterial isolates were obtained from the root system of A. macrostachyum and screened for resistance to 1.25 and 12.5mM of Cr(VI) in plant-based culture medium prepared from the halophyte shoot juice. The six most tolerant isolates were identified based on cell morphology and API microtube profiles. Those isolates were found closely related to Bacillus lentus, Burkholderia cepacia, Raoultella ornithinolytica and Providencia retgeri indicated on the online database. Among the strains tested for their ability to accumulate chromium, Bacillus lentus was the most effective with an average accumulation percentage of 17.8, Providencia retgeri ranked thereafter (15.1%). Bacillus circulance was the least with a negligible accumulation level of 0.5%. The biosorption rate of the heavy metal was contact time- and bacterial strain-dependent. Again, Bacillus lentus showed the highest uptake capacity of 32.8mg g-1, a parameter that positively correlated with contact time (r= 0.865), this was not the case with Burkholderia cepacia where the correlation was negative (r= – 0.811). When introduced into an aqueous solution of 25mg L-1 Cr(VI), Burkholderia cepacia was the superior in Cr(VI) reduction (86.7%), while Bacillus circulance failed to reduce the heavy metal. The pH 5.5 was the most favorable for bacterial Cr accumulation which proportionally decreased as the acidity of the solution increased. This study provides more understanding of the significant contribution of the heavy metal-tolerant microbiome to improve the metal remediation efficiency of halophytic plant covers of stressed environments.
546			_aSummary in Arabic.
650		0	_aChromium _xBioaccumulation _932359
650		0	_aHeavy metals _xBioaccumulation _932360
700	1		_aTaher, Heba S. _932345
700	1		_aYoussef, Hanan H. _932346
700	1		_aFayez, Mohammed _932347
700	1		_aEL-Bana, Magdy I. _932348
700	1		_aELbous, Mona M. _932349
700	1		_aHegazi, N. A. _918741
773	0		_tEgyptian Journal of Microbiology. _g2020.v.55(1) _x0022-2704 _7nnas _wu184012
856	4	0	_uhttp://nile.enal.sci.eg/EALE/2020/EJM/5520/1/15.pdf _zFull Text Article.
942			_cAR _2alc