• Non ci sono risultati.

Effect of pH and time on the accumulation of heavy metals in Gram-negative bacteria

N/A
N/A
Protected

Academic year: 2021

Condividi "Effect of pH and time on the accumulation of heavy metals in Gram-negative bacteria "

Copied!
1
0
0

Testo completo

(1)

Effect of pH and time on the accumulation of heavy metals in Gram-negative bacteria

Benmalek Yamina

Laboratoire de Microbiologie, Département de Biologie Cellulaire et Moléculaire, Faculté des sciences biologiques, Université des Sciences et de la Technologie Houari Boumediene, Alger/Algérie.

Abstract. The release of heavy metals into our environment is very important and causes an environmental pollution problem. Contamination of the aquatic environment by toxic heavy metals is a serious pollution problem because they can reach water-courses either naturally through a variety of geochemical processes or by direct discharge of municipal, agricultural and industrial wastewater. The bioremediation of heavy metals using microorganisms has received a great deal of attention in recent years because their potential application in industry. Microorganisms uptake metal either actively (bioaccumulation) and passively (biosorption). Some bacteria have developed chromosomally or extra-chromosomally controlled detoxification mechanisms to overcome the detrimental effects of heavy metals. In the present work, we have studied resistance to heavy metals and the capacity of a Gram-negative bacteria to accumulate lead and zinc. Results obtained indicated that the bacterial strain exhibited high Minimal Inhibitory Concentration (MIC) values for metal ions tested ranging from 75 mg/l to 500 mg/l and it was able to accumulate more than 90% of lead and zinc during the active growth cycle. Effect of pH and time on heavy metal removal was also studied properly.

Keywords: Gram-negative bacteria, heavy metals, bioaccumulation .

DOI: 10.1051 /



C

Owned by the authors, published by EDP Sciences, 2014 ,

/201

Web of Conferences (201 ) 01

E3S

e sconf 3

3 1 410 3

3 4103 0

0

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Article available at http://www.e3s-conferences.org or http://dx.doi.org/10.1051/e3sconf/20130141030

Riferimenti

Documenti correlati

T, thalidomide; I, interferon α -2b; R, lenalidomide; P, prednisone; V, bortezomib; MPT, melphalan-prednisone-thalidomide; MPR, melphalan-prednisone-lenalidomide;

The TF values indicate that only Cd was accumulated in plants.The contents of Cd in three vegetable samples, Pb in four samples, and Cu in one sample were above the

We argue that the mental model theory is a better candidate for explaining the mechanisms underlying the role of gestures in discourse and text comprehension because of its

(70) un elemento che, dogmaticamente, potrebbe precludere alla configurabilità dell’accordo di valorizzazione quale esempio di cooperazione amministrativa su base orizzontale

− Continue research in Transcarpathia (Beregszaszi jaras which serves as a main source of Ukrainian labour to Hungarian market and Solotvyno which provides us with

Going forward, we recommend that the intensity of preconditioning stimuli should be minimized when attempting to measure ppTMS TEPs using TMS-EEG for two primary reasons: (1)

The aim of the present systematic review was to summarise the skeletal, dento-alveolar and soft tissue effects of orthopaedic treatment on growing patients with skeletal Class

rent neural network can use great quantities of information from other mechanical (such as mechanical power output and pedalling cadence) and physiological markers (such as heart