Resource Type

Journal Article 188

Conference Information 5

Conference Videos 2

Year

2023 6

2022 17

2021 22

2020 20

2019 17

2018 17

2017 17

2016 15

2015 15

2014 2

2013 7

2012 3

2011 3

2010 8

2009 5

2008 6

2007 6

2006 1

2005 3

2002 2

open ︾

Keywords

E-waste 5

E-cadherin 4

Escherichia coli 3

“ 2

β 2

-catenin 2

E. coli 2

China 2

Copper 2

E” 2

E-commerce 2

E3 ubiquitin ligase 2

concrete 2

degradation 2

hydrogen 2

lunar exploration 2

lung cancer 2

optimization 2

-ECBM 1

open ︾

Search scope:

排序： Display mode:

Deposition of copper nanoparticles on multiwalled carbon nanotubes modified with poly (acrylic acid) and their antimicrobial application in water treatment

Li SHENG,Shuhang HUANG,Minghao SUI,Lingdian ZHANG,Lei SHE,Yong CHEN

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 4,   Pages 625-633 doi: 10.1007/s11783-014-0711-8

Abstract: A novel hybrid material, Cu-PAA/MWCNTs (copper nanoparticles deposited multiwalled carbon nanotubes with poly (acrylic acid) as dispersant, was prepared and expected to obtain a more effective and well-dispersed disinfection material for water treatment. X-ray energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), the X-ray fluorescence (XRF), X-ray photoelectron spectra (XPS), Fourier transform infrared spectra (FT-IR), Raman spectroscopy, and thermal gravimetric analyzer (TGA) were used to characterize the Cu-PAA/MWCNTs. ( ) was employed as the target bacteria. The cell viability determination and fluorescence imaging results demonstrated that Cu-PAA/MWCNTs possessed strong antimicrobial ability on . The deposited Cu was suggested to play an important role in the antimicrobial action of Cu-PAA/MWCNTs.

Keywords： multiwalled carbon nanotubes     copper nanoparticles     antimicrobial activity     Escherichia coli (E. coil)    

HTML PDF Collect

Mobile CRISPR-Cas9 based anti-phage system in E. coli

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 8,   Pages 1281-1289 doi: 10.1007/s11705-022-2141-7

Abstract: Escherichia coli is one of the most important microbial cell factories, but infection by bacteriophagesHere, we developed a mobile CRISPR-Cas9 based anti-phage system for bacteriophages defense in E. coliFor preventing phage infection in E. coli, the pGM2 decreased the phage infection rate to 0.1%These results support the potential application of MCBAS in E. coli cell factories to defend against

Keywords： phage infections     anti-phage     CRISPR-Cas9     conjugative transfer     synthetic biology    

HTML PDF Collect

Detection of Escherichia coli in wastewater based on enzyme immunoassay

XI Haiyan, CAI Qiang, HE Miao, SHI Hanchang

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 3,   Pages 381-384 doi: 10.1007/s11783-007-0065-6

Abstract: This research describes a fast detection method on the basis of enzyme-linked immunosorbent assay (ELISA) for in drainage of wastewater treatment plants. Optimized conditions such as the reaction format (sandwich or direct), the concentrations of diluted horse radish peroxidase (HRP)- conjugate, and anti-HPR antibody and pretreatment of were studied. Those results showed that the linear range of detection for was 10 cfu/mL– 6 × 10 cfu/mL. Compared with conventional methods, it is a convenient and sensitive detection method with low cost.

Keywords： conventional     sandwich     pretreatment     enzyme-linked immunosorbent     detection    

HTML PDF Collect

italic>rpoS deficiency suppresses acetate accumulation in glucose-enriched culture of Escherichiacoli under an aerobic condition

Prayoga SURYADARMA, Yoshihiro OJIMA, Yuto FUKUDA, Naohiro AKAMATSU, Masahito TAYA

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 2,   Pages 152-157 doi: 10.1007/s11705-012-1287-0

Abstract: The role of on the central carbon metabolism was investigated through analyzing the deficiency of this regulon gene under aerobic and glucose-enriched culture conditions. The experimental results showed that while the wild type cells exhibited an overflow metabolism effect, the -deleting mutation alleviated this effect with the significant suppression of acetate accumulation under a high glucose condition. This gene deletion also induced the twofold upregulation of and one-tenth downregulation of , respectively. The overflow metabolism effect was confirmed to be recovered by re-introducing gene into the mutant. These results demonstrated changed the central carbon metabolism toward acetate overflow through dehydrogenation of pyruvate and reduction of TCA cycle activity.

Keywords： Escherichia coli     rpoS     aerobic and glucose-enriched culture     overflow    

HTML PDF Collect

Transport of bacterial cell (

Wei Fan, Qi Li, Mingxin Huo, Xiaoyu Wang, Shanshan Lin

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 4, doi: 10.1007/s11783-020-1242-0

Abstract: . • E. coli cells within different recharge water displayed different spreading risks.The dwelling process in recharge pond imposed physiologic stress on Escherichia coli (E. coli) cells,in all three types of investigated recharge water resources and the cultivation of E. coli under varyingThe E. coli cells in rainfall recharge water displayed the highest mobility (least retention), followedThe findings of this study contribute to an improved understanding of E. coli transport in actual AGR

Keywords： Artificial groundwater recharge     E. coli     Transport     Simulated column experiments     Modeling    

HTML PDF Collect

Enhanced disinfection of Escherichia coli and bacteriophage

Guiying RAO, Kristen S. BRASTAD, Qianyi ZHANG, Rebecca ROBINSON, Zhen HE, Ying LI

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 4, doi: 10.1007/s11783-016-0854-x

Abstract: A novel photocatalytic Ag-Cu-TiO nanowire membrane was fabricated. Bacteria and virus disinfection was improved by co-depositing Ag and Cu onto membrane. Synergetic photocatalytic effects and free metal ions of Ag and Cu contribute to disinfection. 7.68 log removal of and 4.02 log removal of bacteriophage MS2 were achieved. Titanium dioxide (TiO ) is a widely used photocatalyst that has been demonstrated for microorganism disinfection in drinking water. In this study, a new material with a novel structure, silver and copper loaded TiO nanowire membrane (Cu-Ag-TiO ) was prepared and evaluated for its efficiency to inactivate and bacteriophage MS2. Enhanced photo-activated bactericidal and virucidal activities were obtained by the Cu-Ag-TiO membrane than by the TiO , Ag-TiO and Cu-TiO membranes under both dark and UV light illumination. The better performance was attributed to the synergies of enhanced membrane photoactivity by loading silver and copper on the membrane and the synergistic effect between the free silver and copper ions in water. At the end of a 30 min test of dead-end filtration under 254 nm UV irradiation, the Cu-Ag-TiO membrane was able to obtain an removal of 7.68 log and bacteriophage MS2 removal of 4.02 log, which have met the US EPA standard. The free metal ions coming off the membrane have concentrations of less than 10 ppb in the water effluent, far below the US EPA maximum contaminant level for silver and copper ions in drinking water. Therefore, the photo-activated disinfection by the Cu-Ag-TiO membrane is a viable technique for meeting drinking water treatment standards of microbiological water purifiers.

Keywords： Photo-activated disinfection     Titanium dioxide     Nanowire membrane     Silver     Copper    

HTML PDF Collect

Molecular dynamics modeling of a single diamond abrasive grain in grinding

SAVVOPOULOS,Nikolaos E. KARKALOS,Dimitrios E. MANOLAKOS

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 2,   Pages 168-175 doi: 10.1007/s11465-015-0337-y

Abstract:

In this paper the nano-metric simulation of grinding of copper with diamond abrasive grains, using the molecular dynamics (MD) method, is considered. An MD model of nano-scale grinding, where a single diamond abrasive grain performs cutting of a copper workpiece, is presented. The Morse potential function is used to simulate the interactions between the atoms involved in the procedure. In the proposed model, the abrasive grain follows a curved path with decreasing depth of cut within the workpiece to simulate the actual material removal process. Three different initial depths of cut, namely 4 ?, 8 ? and 12 ?, are tested, and the influence of the depth of cut on chip formation, cutting forces and workpiece temperatures are thoroughly investigated. The simulation results indicate that with the increase of the initial depth of cut, average cutting forces also increase and therefore the temperatures on the machined surface and within the workpiece increase as well. Furthermore, the effects of the different values of the simulation variables on the chip formation mechanism are studied and discussed. With the appropriate modifications, the proposed model can be used for the simulation of various nano-machining processes and operations, in which continuum mechanics cannot be applied or experimental techniques are subjected to limitations.

Keywords： molecular dynamics     abrasive process     chip formation     cutting force     temperature    

HTML PDF Collect

Policy options for Agriculture Green Development by farmers in China

Laurence E. D. SMITH

Frontiers of Agricultural Science and Engineering 2020, Volume 7, Issue 1,   Pages 90-97 doi: 10.15302/J-FASE-2019290

Abstract:

Farmers are the key agents who manage land and water. Agriculture Green Development (AGD) requires a transformation in farming from high resource consumption and environmental cost to sustainable intensification with high productivity, high resource use efficiency and low environmental risk. This paper analyzes the public policy challenge of AGD and makes the case for a location-sensitive policy mix made up of regulation, advice provision, voluntarism and targeted incentives. The public agricultural extension service in China is a key resource, but one that requires reorientation and reform with the aim of better balancing high farm productivity with environmental protection.

Keywords： agriculture     environment     development     incentives     policy     regulation    

HTML PDF Collect

Characteristics of two transferable aminoglycoside resistance plasmids in

Chengjun Pu, Xiaoyan Gong, Ying Sun

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 3, doi: 10.1007/s11783-019-1119-2

Abstract:

pRKZ3 is a non-conjugative IncQ plasmid, while pKANJ7 is a conjugative IncX plasmid.

The optimal mating time of pKANJ7 varied under different conditions.

Both of the two transferable ARPs had little impact on the growth of their hosts.

A relatively high level of fitness cost was observed for pKANJ7.

The fitness cost of ARPs depended on their hosts.

Keywords： Escherichia coli     Characteristics     Aminoglycoside resistance plasmids     Transfer     Persistence    

HTML PDF Collect

Analysis of antibiotic resistance of

Yangyang Yu, Xiaolin Zhu, Guanlan Wu, Chengzhi Wang, Xing Yuan

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 3, doi: 10.1007/s11783-019-1123-6

Abstract: /listitem>

There was a seasonal difference in antibiotic resistance of E.coli.

The E. coli in the Yitong River was found

Keywords： Yitong River     Coliform bacteria     Antibiotic resistance     Escherichia coli    

HTML PDF Collect

Association between heavy metals and antibiotic-resistant human pathogens in environmental reservoirs: A review

Christine C. Nguyen, Cody N. Hugie, Molly L. Kile, Tala Navab-Daneshmand

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 3, doi: 10.1007/s11783-019-1129-0

Abstract:

P. aeruginosa and E. coli are commonly

Keywords： Zinc     Cadmium     Copper     Lead     E. coli     P. aeruginosa    

HTML PDF Collect

Behavior of materials for earth and rockfill dams: Perspective from unsaturated soil mechanics

Eduardo E. ALONSO, Rafaela CARDOSO,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 1,   Pages 1-39 doi: 10.1007/s11709-010-0013-6

Abstract: The basis of the design of earth and rockfill dams is focused on ensuring the stability of the structure under a set of conditions expected to occur during its life. Combined mechanical and hydraulic conditions must be considered since pore pressures develop during construction, after impoundment and in drawdown. Other instability phenomena caused by transient flow and internal erosion must be considered. The prediction of the hydro-mechanical behavior of traditional and non-traditional materials used in the construction of dams is therefore fundamental. The materials used for dam’s construction cover a wide range from clayey materials to rockfill. In a broad sense they are compacted materials and therefore unsaturated materials. A summary of the current level of knowledge on the behavior of traditional materials used in the construction of dams is presented in the paper. Regular compacted materials (with a significant clay fraction), rockfill and compacted soft rocks are studied with more detail. The latter are non-traditional materials. They are analysed because their use, as well as the use of mixtures of soil and rock, is becoming more necessary for sustainability reasons.

Keywords： dams     unsaturated soil mechanics     suction     rockfill     clayey soil     mixture    

HTML PDF Collect

Sustainable intensification of agriculture in Africa

SCHUT, Ken E. GILLER

Frontiers of Agricultural Science and Engineering 2020, Volume 7, Issue 4,   Pages 371-375 doi: 10.15302/J-FASE-2020357

Abstract: Sustainable intensification is a key component of agricultural development in Africa, urgently needed to wean the continent off foreign food supply and to limit agricultural farmland expansion. It is expected that a relatively small fraction of farmers will adopt fertilizer technology, as profits in current economic settings are relatively small while risks are considerable with varying prices and uncertain yield responses. Many smallholders depend on off-farm income and local markets for food supply. Structural adjustments are therefore needed to allow management of larger units of land by trained farmers willing to take this opportunity, while recognizing land right sensitivities. There are large opportunities for African commodity crops to improve food security, including cassava and East African highland banana that strongly respond to fertilizer with limited environmental risks under good management. This requires investments in better functioning markets, local fertilizer production facilities that can produce regional crop blends and cost-efficient distribution networks, providing balanced fertilizers for African farmers.

Keywords： Green Revolution     Manihot esculenta     Musa acuminata     sub-Saharan Africa    

HTML PDF Collect

Surface-Driven High-Pressure Processing Perspective

Keith E. Gubbins, Kai Gu, Liangliang Huang, Yun Long, J. Matthew Mansell, Erik E.

Engineering 2018, Volume 4, Issue 3,   Pages 311-320 doi: 10.1016/j.eng.2018.05.004

Abstract:

The application of high pressure favors many chemical processes, providing higher yields or improved rates in chemical reactions and improved solvent power in separation processes, and allowing activation barriers to be overcome through the increase in molecular energy and molecular collision rates. High pressures—up to millions of bars using diamond anvil cells—can be achieved in the laboratory, and lead to many new routes for chemical synthesis and the synthesis of new materials with desirable thermodynamic, transport, and electronic properties. On the industrial scale, however, high-pressure processing is currently limited by the cost of compression and by materials limitations, so that few industrial processes are carried out at pressures above 25 MPa. An alternative approach to high-pressure processing is proposed here, in which very high local pressures are generated using the surface-driven interactions from a solid substrate. Recent experiments and molecular simulations show that such interactions can lead to local pressures as high as tens of thousands of bars (1 bar= 1 _ 105 Pa), and even millions of bars in some cases. Since the active high-pressure processing zone is inhomogeneous, the pressure is different in different directions. In many cases, it is the pressure in the direction parallel to the surface of the substrate (the tangential pressure) that is most greatly enhanced. This pressure is exerted on the molecules to be processed, but not on the solid substrate or the containing vessel. Current knowledge of such pressure enhancement is reviewed, and the possibility of an alternative route to high-pressure processing based on surface-driven forces is discussed. Such surface-driven high-pressure processing would have the advantage of achieving much higher pressures than are possible with traditional bulk-phase processing, since it eliminates the need for mechanical compression. Moreover, no increased pressure is exerted on the containing vessel for the process, thus eliminating concerns about materials failure.

Keywords： Confinement     High pressure     High pressure phase     High pressure reaction     High pressure manufacture     High pressure chemical processing    

HTML PDF Collect

Pore structure of cementitious material enhanced by graphitic nanomaterial: a critical review

GHAHARI, E. GHAFARI, L. ASSI

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 1,   Pages 137-147 doi: 10.1007/s11709-017-0431-9

Abstract: Carbon nano tubes (CNT) has been introduced as an efficient nanomaterial in order to improve the mechanical and durability properties of concrete. The effect of CNT on the microstructures of cementitious materials has been widely reported. This paper combines a critical review on the effect of CNT on the pore and microstructure of cement composite with a discussion on the porosity measurement of pastes containing CNT using mercury intrusion porosimetry techniques (MIP). It was found that, surface treatment by H SO and HNO solution forms carboxyl acid groups on CNTs’ surfaces that lead to the improvement of reinforcement. In this scope, this review paper involves analyzing the effect of CNT on the microstructure and the pore structure of cementitious materials. The existing methods of measuring the porosity of cementitious material are reviewed, in particular, the contact angle measurement is discussed in detail in which the most effective parameters and possible errors of calculation is presented.

Keywords： carbon nano tubes     microstructure     porosity     mercury intrusion porosimetry     cement composite    

HTML PDF Collect

Title Author Date Type Operation

Deposition of copper nanoparticles on multiwalled carbon nanotubes modified with poly (acrylic acid) and their antimicrobial application in water treatment

Li SHENG,Shuhang HUANG,Minghao SUI,Lingdian ZHANG,Lei SHE,Yong CHEN

Journal Article

Mobile CRISPR-Cas9 based anti-phage system in E. coli

Journal Article

Detection of Escherichia coli in wastewater based on enzyme immunoassay

XI Haiyan, CAI Qiang, HE Miao, SHI Hanchang

Journal Article

italic>rpoS deficiency suppresses acetate accumulation in glucose-enriched culture of Escherichiacoli under an aerobic condition

Prayoga SURYADARMA, Yoshihiro OJIMA, Yuto FUKUDA, Naohiro AKAMATSU, Masahito TAYA

Journal Article

Transport of bacterial cell (

Wei Fan, Qi Li, Mingxin Huo, Xiaoyu Wang, Shanshan Lin

Journal Article

Enhanced disinfection of Escherichia coli and bacteriophage

Guiying RAO, Kristen S. BRASTAD, Qianyi ZHANG, Rebecca ROBINSON, Zhen HE, Ying LI

Journal Article

Molecular dynamics modeling of a single diamond abrasive grain in grinding

SAVVOPOULOS,Nikolaos E. KARKALOS,Dimitrios E. MANOLAKOS

Journal Article

Policy options for Agriculture Green Development by farmers in China

Laurence E. D. SMITH

Journal Article

Characteristics of two transferable aminoglycoside resistance plasmids in

Chengjun Pu, Xiaoyan Gong, Ying Sun

Journal Article

Analysis of antibiotic resistance of

Yangyang Yu, Xiaolin Zhu, Guanlan Wu, Chengzhi Wang, Xing Yuan

Journal Article

Association between heavy metals and antibiotic-resistant human pathogens in environmental reservoirs: A review

Christine C. Nguyen, Cody N. Hugie, Molly L. Kile, Tala Navab-Daneshmand

Journal Article

Behavior of materials for earth and rockfill dams: Perspective from unsaturated soil mechanics

Eduardo E. ALONSO, Rafaela CARDOSO,

Journal Article

Sustainable intensification of agriculture in Africa

SCHUT, Ken E. GILLER

Journal Article

Surface-Driven High-Pressure Processing

Keith E. Gubbins, Kai Gu, Liangliang Huang, Yun Long, J. Matthew Mansell, Erik E.

Journal Article

Pore structure of cementitious material enhanced by graphitic nanomaterial: a critical review

GHAHARI, E. GHAFARI, L. ASSI

Journal Article