H. R. Jafari Articles | Environmental XPRT

Role of sediments in modifying the toxicity of two roundup formulations to six species of larval anurans

The role of sediment in modifying the toxicity of the original formulation of Roundup® and Roundup WeatherMAX® was examined in aqueous laboratory tests. Six species of anurans (Bufo fowleri, Hyla chrysoscelis, Rana catesbeiana, R. clamitans, R. sphenocephala, and R. pipiens) were exposed at Gosner stage 25 to concentrations of the 2 herbicide formulations in 96‐hour, static, non‐renewal ...

Aug. 16, 2014

By John Wiley & Sons, Ltd.

Novel carotenoid-based biosensor for simple visual detection of arsenite: characterization and preliminary evaluation for environmental application

A novel whole-cell arsenite biosensor was developed using the photosynthetic bacterium Rhodopseudomonas palustris no. 7 and characterized. A sensor plasmid containing the operator-promoter region of the ars operon and arsR gene from Escherichia coli and the crtI gene from R. palustris no. 7 was introduced into a blue-green mutant with crtI deleted, R. palustris no. 711. The biosensor ...

Aug. 28, 2008

By American Society for Microbiology (ASM)

Putting environmental quality on the performance track

This article from the Journal of Environmental Management - Arizona presents the incentives and structure of Arizona's Performance Track program. In 2003, shortly after the Napolitano Administration took office, the Arizona Department of Environmental Quality (ADEQ) previewed our desire to develop a program to promote sound environmental management through recognition and regulatory flexibility. ...

Jan. 1, 2005

By Environmental Data Management, LLC (EDM)

H&S Operational Efficiency: Fugitive emissions

During normal operations, leaks can occur from pumps, valves, flanges, storage tanks or during loading and unloading. According to the US EPA3, valves and connectors account for more than 90% of emissions from leaking equipment and there are hundreds of pieces of equipment as shown in Figure 3. Figure 3: Typical equipment counts (EPA) Source: “Cost and Emission Reductions for ...

Mar. 16, 2018

By Ion Science Ltd.

Prevalence and genetic diversity of bartonella species isolated from wild rodents in Japan

Here, we describe for the first time the prevalence and genetic properties of Bartonella organisms in wild rodents in Japan. We captured 685 wild rodents throughout Japan (in 12 prefectures) and successfully isolated Bartonella organisms from 176 of the 685 rodents (isolation rate, 25.7%). Those Bartonella isolates were all obtained from the rodents captured in suburban areas (rate, 51.8%), but ...

Aug. 1, 2008

By American Society for Microbiology (ASM)

Simultaneous phosphorus uptake and denitrification by EBPR-r biofilm under aerobic conditions: effect of dissolved oxygen

A biofilm process, termed enhanced biological phosphorus removal and recovery (EBPR-r), was recently developed as a post-denitrification approach to facilitate phosphorus (P) recovery from wastewater. Although simultaneous P uptake and denitrification was achieved despite substantial intrusion of dissolved oxygen (DO >6 mg/L), to what extent DO affects the process was unclear. Hence, in ...

Jun. 22, 2015

By IWA Publishing

Manganese waste water treatment by fungi derived from manganese slag

The aim of this study was to isolate a mould from the surface of manganese slag which had strong resistance and high adsorption of Mn2 + , and to determine the effects of initial Mn2 + concentration, incubation temperature, rotation speed and inoculation amount on adsorption of Mn2 + from manganese waste water solution. The result showed that a mould (A5) which was isolated from manganese slag ...

Sep. 1, 2010

By IWA Publishing

The empirical analysis for fractal features and long-run memory mechanism in petroleum pricing systems

The fractal behaviour for petroleum pricing is investigated in several international systems. Based on the time series of Brent & WTI crude oil and Rotterdam & Singapore Leaded gasoline prices (daily spot), this paper analyses the fractal features in the systems under study by using Rescaled Range analysis (R/S analysis). This paper also estimates the Hurst exponents; thus, long-term memory ...

Aug. 14, 2007

By Inderscience Publishers

Evaluation of microbial systems for biotreatment of cassava mill waste water in Nigeria: biodegradation of cyanide

The capability of six isolated bacterial strains to utilise cyanide in cassava mill wastewater as a nitrogen source in a batch bioreactor was examined and evaluated. The results revealed that all the isolates were capable of degrading cyanide with percent degradation between 60 and 94% in 96 h. There was high positive correlation between cyanide biodegradation and microbial growth (0.90 ≤ R² ≤ ...

Dec. 4, 2012

By Inderscience Publishers

Nitrous oxide emissions from a waterbody in the Nenjiang basin, China

Using static, closed chambers and gas chromatography techniques, nitrous oxide (N2O) emissions have been monitored for 1 year (2009–2010) on an inland running waterbody downstream of the Nenjiang basin, China. During the freezing period, holes were dug in the ice in order to obtain nitrous oxide samples. Here, we have focused on water-air gas exchange and factors which might influence ...

Oct. 5, 2012

By IWA Publishing

plastic pipe fitting mold technology

“ Forever care you, care your molds”, is our insist mentality philosophy. We insist on mold construction design and steel quality, believe these two factors are main points to achieve mold with excellent performance. produces moulds for PVC pressure pipe fitting, PVC drainage pipe fittings, PP-H sewage fittings, PP, HDPE corrugated pipe fittings, PP-R pipe fittings. With the ...

Jul. 8, 2015

By Focare Mould Co.,Ltd.

Septins stabilize mitochondria in tetrahymena thermophila

We describe phylogenetic and functional studies of three septins in the free-living ciliate Tetrahymena thermophila. Both deletion and overproduction of septins led to vacuolization of mitochondria, destabilization of the nuclear envelope, and increased autophagy. All three green fluorescent protein-tagged septins localized to mitochondria. Specific septins localized to the outer mitochondrial ...

Aug. 1, 2008

By American Society for Microbiology (ASM)

Toxicity of the conventional energetics TNT and RDX relative to new insensitive munitions constituents DNAN and NTO in Rana pipiens tadpoles

An initiative within the U.S. military is targeting the replacement of traditional munitions constituents (MCs) with insensitive munitions (IMs) to reduce risk of accidental detonation. The purpose of the present study was to comparatively assess toxicity of the traditional MCs 2,4,6‐trinitrotoluene (TNT) and 1,3,5‐trinitroperhydro‐1,3,5‐triazine (RDX) with the new IM constituents 2, 4‐ ...

Jan. 14, 2015

By John Wiley & Sons, Ltd.

Temperature Compensation and Control

Alkalinity, pH , and conductivity are just a few of many parameters that are highly affected by temperature. In order to ensure accurate measurements, it is critical to maintain the temperature of the measurement by either a) compensation via mathematical correction, or b) keeping the sample to a constant reference temperature. pH The slope calculated by a pH electrode follows accordingly with ...

Dec. 10, 2019

By MANTECH Inc.

Extrusion granulation production line without drying double roller

The production line of double roller granulator is produced by non drying and normal temperature process. According to the output requirements, the output can reach 1-8t / h. The equipment has the advantages of less investment, quick effect, good economic benefit, compact process layout, scientific and reasonable, advanced technology, energy saving and consumption reduction, no discharge of three ...

Apr. 6, 2021

By Zhengzhou Tianci Heavy Industry Technology Co., Ltd.

Road Over Sensitive Groundwater Areas - Case Study

When constructing or extending new roads, the responsible designers and contractors are increasingly faced with the task of preventing soil contamination. Therefore, measures for the protection of the groundwater are necessary in more and more cases. The corresponding requirements and specifications for such measurements are regulated in the "guide-line for constructional measurements of roads in ...

Aug. 8, 2014

By NAUE GmbH & Co.KG

Exergy analysis of a Vapour Compression Refrigeration system with R-22, R-407C and R-410A

The parametric investigations of actual Vapour Compression Refrigeration (VCR) cycle in terms of Coefficient of Performance (COP), Exergy Destruction (ED) and exergetic efficiency of refrigerants R-22, R-407C and R-410A have been predicted with the help of a developed computational model. The present investigation has been carried out for evaporator and condenser temperatures in the range of ...

Sep. 12, 2007

By Inderscience Publishers

NVH Independent Roller Chassis Dyno - Volkswagen Skoda - Czech Republic - Case Study

Project Overview: Sierra CP was successfully awarded the contract to design and install NVH chassis dynamometers into Skoda’s prestigious new R&D test facility. The specific challenge was to design a unique solution to meet the clients exacting specifications and also to fit into the pre-designed and built test chambers. Key Performance Features: 4x4 & 4x2 independent wheel ...

Apr. 8, 2019

By Sierra Instruments, Inc.

Canarina CUSTIC software · noise calculation · algorithms 3

In a road case, we shall consider several points. We shall consider a minimum number of 1000 vehicles per hour N with a 50km/h minimum velocity (100km/h is the maximum velocity). Then we have a 68 dB(A) noise level at 10m from a lineal road (infinity length). The noise level will be, Leq=68dB(A)+30Log(v/50)+10Log(N/1000)-10Log(r/10) in the lineal (infinite) road case. In the curved ...

Nov. 20, 2011

By Canarina Environmental Software

Globalisation of R&D

The globalisation of the critical R&D function is more necessary than ever. But managers continue to be daunted by the complexity this strategic change requires. In our work with leading companies around the world - and in a global survey of senior technology and innovation managers - Arthur D. Little has begun to evaluate and identify impediments and emerging best practices in the quest for ...

Feb. 11, 2004

By Inderscience Publishers

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