Yuan-Yuan Cheng

Yuan-Yuan Cheng
Anhui University · School of Life Sciences

Ph. D.

About

35
Publications
12,716
Reads
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1,075
Citations
Citations since 2017
7 Research Items
841 Citations
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
Additional affiliations
June 2014 - present
Anhui University
Position
  • Professor (Assistant)
March 2010 - present
University of Science and Technology of China
Position
  • PostDoc Position
September 2004 - July 2009
University of Science and Technology of China
Position
  • PhD Student

Publications

Publications (35)
Article
Full-text available
YgfY(SdhE/CptB) is highly conserved while has controversial functions in bacteria. It works as an antitoxin and composes a type IV toxin–antitoxin system with YgfX(CptA) typically in Escherichia coli, while functions as an flavinylation factor of succinate dehydrogenase and fumarate reductase typically in Serratia sp. In this study, we report the c...
Article
Full-text available
Shewanella oneidensis is a model strain of the electrochemical active bacteria (EAB) because of its strong capability of extracellular electron transfer (EET) and genetic tractability. In this study, we investigated the effect of carbon sources on EET in S. oneidensis by using reduction of palladium ions (Pd(II)) as a model and found that pyruvate...
Article
CdSe quantum dots (QDs) are semiconductor materials and possess unique optical and electronic properties, therefore being increasingly used in many fields. Biosynthesis of CdSe QDs has several advantages over the chemical synthesis route. In this study, the CdSe QDs were biosynthesized using a yeast Rhodotorula mucilaginosa PA-1 under the aerobic c...
Article
Microbes in sediments contribute to nutrient release and play an important role in lake eutrophication. However, information about the profiles of functional genes and bacterial communities and the most important environmental factor affecting them in the sediments of eutrophic lake remains unrevealed. In this work, the real-time fluorescent quanti...
Article
Full-text available
Iron reduction mediated by Fe(III)-reducing bacteria (FeRB) occurs in aqueous environments and plays an essential role in removing contaminates in polluted freshwater lakes. Two model FeRB species, Shewanella and Geobacter, have been intensively studied because of their functions in bioremediation, iron reduction, and bioelectricity production. How...
Article
Shewanella species have a diverse respiratory ability and wide distribution in environments and play an important role in bioremediation and the biogeochemical cycles of elements. Primers with more accuracy and broader coverage are required with consideration of the increasing number of Shewanella species and evaluation of their roles in various en...
Article
Although microbial synthesized palladium nanoparticles (bioPd) have been demonstrated to exhibit a great activity toward dechlorination of several chlorinated pollutants, there is no systematic investigation into the substituent effect on dechlorination. Chloronitrobenzenes are widely used for manufacturing and known as persistent pollutants with r...
Article
Full-text available
Although the capacity for electroactive bacteria to convert environmental metallic minerals and organic pollutants is well known, the role of the redox properties of microbial extracellular polymeric substances (EPS) in this process is poorly understood. In this work, the redox properties of EPS from two widely present electroactive bacterial strai...
Article
Full-text available
Importance: Motility and biofilm are mutually exclusive lifestyles, shifts between which are under strict regulation of bacteria to adapt to the fluctuation of diverse environmental conditions. FlrA protein in many bacteria is known to control motility as a master regulator of flagella synthesis. This work elucidates its effect on biofilm formatio...
Article
Full-text available
Exoelectrogenic bacteria (EEB) play important roles in biogeochemical cycling, environmental remediation, wastewater treatment, and bioenergy recovery. Methods for effectively and rapidly probing the abundance of EEB in environments are highly desirable. In this work, a novel approach that couples WO3 nanoclusters and the most probable number (MPN)...
Article
Shewanella oneidensis MR-1 is a model dissimilatory iron reducing bacterium and plays an important role in bioremediation and biogeochemical cycling of elements. Understanding the potential interaction between iron and nitrate respirations by S. oneidensis MR-1 is of great significance for environmental bioremediation. In this paper, the stimulatin...
Article
Full-text available
Microbial extracellular electron transfer (EET) is critically involved in many pollutant conversion processes in both natural environment and engineered bioelectrochemical systems (BES), but typically with limited efficiency and poor controllability. In this study, we discover an important role of uncouplers in affecting the microbial energy metabo...
Article
Full-text available
The ability of dissimilatory metal-reducing microorganisms (DMRM) to conduct extracellular electron transfer with conductive cellular components grants them a great potential for bioenergy and environmental applications. Crystalline Fe(III) oxides, a type of widespread electron acceptor for DMRM in nature, can be excited by light for photocatalysis...
Article
In this study, 27 strains of electrochemically active bacteria (EAB) were rapidly isolated and their capabilities of extracellular electron transfer were identified using a photometric method based on WO3 nanoclusters. These strains caused color change of WO3 from white to blue in a 24-well agar plate within 40 h. Most of the isolated EAB strains b...
Article
Full-text available
In situ reduction of selenite to elemental selenium (Se(0)), by microorganisms in sediments and soils is an important process and greatly affects the environmental distribution and the biological effects of selenium. However, the mechanism behind such a biological process remains unrevealed yet. Here we use Shewanella oneidensis MR-1, a widely-dist...
Article
Full-text available
Electrochemically active bacteria (EAB) have the ability to transfer electrons to electron acceptors located outside the cell, and they are widely present in diverse environments. In spite of their important roles in geochemical cycles, environmental remediation and electricity generation, so far, only a limited number and types of EAB have been is...
Article
Full-text available
The dissimilatory metal reducing bacterium Shewanella oneidensis MR-1, known for its capacity of reducing iron and manganese oxides, has great environmental impacts. The iron oxides reducing process is affected by the coexistence of alternative electron acceptors in the environment, while investigation into it is limited so far. In this work, the i...
Article
Dissimilatory metal-reducing bacteria play an important role in environmental bioremediation, and their extracellular electron transfer (EET) and pollutant reduction process can be affected by various redox-active substances. While it is generally thought that these substances usually only accelerate the EET rate, here we discover that the electron...
Article
Bioreduction of hexavalent chromium (Cr(VI)) into trivalent one (Cr(III)) based on microbial immobilization techniques has been recognized as a promising way to remove Cr contaminants from wastewater. However, such a bioreduction process is inefficient due to limited electron transfer through the immobilization matrix. In this study, a modified imm...
Article
Full-text available
Although oxygen has been reported to regulate biofilm formation by several Shewanella species, the exact regulatory mechanism mostly remains unclear. Here, we identify a direct oxygen-sensing diguanylate cyclase (DosD) and reveal its regulatory role in biofilm formation by Shewanella putrefaciens CN32 under aerobic conditions. In vitro and in vivo...
Article
Shewanella oneidensis MR-1 is an extensively studied dissimilatory metal-reducing bacterium with a great potential for bioremediation and electricity generation. It secretes flavins as electron shuttles which play an important role in extracellular electron transfer. However, the influence of various environmental factors on the secretion of flavin...
Article
Full-text available
Electrochemically active bacteria (EAB) are ubiquitous in environment and have important application in the fields of biogeochemistry, environment, microbiology and bioenergy. However, rapid and sensitive methods for EAB identification and evaluation of their extracellular electron transfer ability are still lacking. Herein we report a novel photom...
Article
Biofuel cells (BFCs) use enzymes and microbial cells to produce energy from bioavailable substrates and treat various wastewaters, and cathodic oxygen reduction is a key factor governing the efficiency of BFCs. In this study, we demonstrated that a green alga, Chlamydomonas reinhardtii, could directly mediate oxygen reduction. Cyclic voltammogram a...
Article
White-rot fungus is able to secrete laccase, which can reduce O2 to H2O and has been widely used in enzymatic fuel cells. In this work, a strain of white-rot fungus, Coriolus versicolor, is inoculated in the cathodic chamber of a microbial fuel cell (MFC) to improve cathode reduction efficiency for better electricity generation. 2,2′-Azino-bis(3-et...

Questions

Questions (4)
Question
An operon in a bacterium contains several genes. The transcriptional level of first gene is ten-folds higher than following genes.
Possible reaons for this?
Question
I aim to compare the transcription level of two genes that encode two enzymes with the same function. I extracted mRNA and compared their transcription using RT-PCR. The Ct (also called Cq) values of two genes from RT-PCR analysis are obvious different. However, I don't how to present this result properly ? Or, are there other methods to achieve this purpose ? By the way, I already used the method of lacZ reporter to compare their expression indirectly.
Question
Does anyone use TetR-based Tet-on expression system in bacteria, such as E.coli ? I used 100 ng/ml doxycycline to induce expression for one hour. However, I haven't observed difference between induced and un-induced samples. Shouldn't I use doxycycline ?  Or its concentration is too low ?
Question
I found a bacterial transcription factor X proved by EMSA. Transcriptome showed that some genes' expression are sigenificantly altered by X. And I wonder if it is possible to predict the conserved binding site of X according to the transcriptome or promoters' region of altered genes. Is there any software can do this?

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