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The impact of cadmium on a multi-spe...

Jin, Peng.

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The impact of cadmium on a multi-species biofilm degrading naphthalene and the role of hydrogen peroxide in cadmium-biofilm interaction .

Record Type:	Language materials, printed : Monograph/item
Title/Author:	The impact of cadmium on a multi-species biofilm degrading naphthalene and the role of hydrogen peroxide in cadmium-biofilm interaction ./
Author:	Jin, Peng.
Description:	165 p.
Notes:	Adviser: Paul L. Bishop.
Contained By:	Dissertation Abstracts International68-05B.
Subject:	Engineering, Environmental. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3264421
ISBN:	9780549025337

The impact of cadmium on a multi-species biofilm degrading naphthalene and the role of hydrogen peroxide in cadmium-biofilm interaction .
Jin, Peng.

The impact of cadmium on a multi-species biofilm degrading naphthalene and the role of hydrogen peroxide in cadmium-biofilm interaction . - 165 p.

Adviser: Paul L. Bishop.

Thesis (Ph.D.)--University of Cincinnati, 2007.

Key words: bioremediation, cadmium, confocal laser scanning microscopy, heavy metals, hydrogen peroxide, microelectrodes, multi-species biofilms, naphthalene, PAHs

ISBN: 9780549025337Subjects--Topical Terms:

783782
Engineering, Environmental.

The impact of cadmium on a multi-species biofilm degrading naphthalene and the role of hydrogen peroxide in cadmium-biofilm interaction .
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020 $a 9780549025337
035 $a (UMI)AAI3264421
035 $a AAI3264421
040 $a UMI $c UMI
100 1 $a Jin, Peng. $3 1264654
245 1 4 $a The impact of cadmium on a multi-species biofilm degrading naphthalene and the role of hydrogen peroxide in cadmium-biofilm interaction .
300 $a 165 p.
500 $a Adviser: Paul L. Bishop.
500 $a Source: Dissertation Abstracts International, Volume: 68-05, Section: B, page: 3305.
502 $a Thesis (Ph.D.)--University of Cincinnati, 2007.
520 $a Key words: bioremediation, cadmium, confocal laser scanning microscopy, heavy metals, hydrogen peroxide, microelectrodes, multi-species biofilms, naphthalene, PAHs
520 $a Polycyclic aromatic hydrocarbons (PAHs) are of major concern because of their toxicity to human health and to natural ecology. The co-presence of heavy metal wastes may hinder or prevent the biodegradation of some of PAHs.
520 $a A macro-micro-molecular methodology was used to study the impact of cadmium on a multi-species biofilm degrading naphthalene and the role of hydrogen peroxide in the toxicity-resistance interaction between cadmium and the biofilm. The impact of cadmium and hydrogen peroxide on the biofilm was studied in batch experiments; cadmium transport and distribution and the micro-environmental profiles of dissolved oxygen and redox potential were investigated with microelectrodes; and microbial community changes in the biofilm were observed using CLSM combined with fluorescence probes.
520 $a Cd2+ sorption in the biofilms was a rapid and highly pH dependent process. Cd2+ started to transport into the biofilm once the contact started. Cd2+ penetrated the biofilm in less than one hour. Most sorption occurred during the first two hours. Naphthalene removal had good correlation with Cd2+ sorption. The biofilm behavior toward naphthalene removal could be divided into three phases. The minimum Cd2+ inhibitory capacity for the biofilms and the Cd 2+ inhibition range were defined as 5 mug Cd/mg VS and from 5 to 10 mug Cd/mg VS, respectively.
520 $a A multi-species biofilm was found to have the ability to resist external inhibitors such as Cd2+. Naphthalene removal and dissolved oxygen consumption were retarded by Cd2+ but were resumed after the retardation period. The dominant components of the microbial community switched from round/rod cells to filamentous microorganisms. However, hydrogen peroxide increased the vulnerability of the biofilm to Cd2+ toxicity. When H2O2 was present, naphthalene removal was significantly inhibited by Cd2+ and did not resume at the end of the experiment. Filamentous microorganisms, which were prolific when only Cd2+ was added, were not found to be dominant in the microbial community.
520 $a A multi-species biofilm developed a resistance upon external inhibition, by making the species that are more tolerant to Cd2+ the dominant ones. However, this resistance was prevented from developing due in the presence of H2O2 which may make the biofilm more vulnerable to Cd2+.
590 $a School code: 0045.
650 4 $a Engineering, Environmental. $3 783782
650 4 $a Environmental Sciences. $3 676987
690 $a 0768
690 $a 0775
710 2 $a University of Cincinnati. $3 960309
773 0 $t Dissertation Abstracts International $g 68-05B.
790 $a 0045
790 1 0 $a Bishop, Paul L., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3264421