Results 11 to 20 of about 11,031 (219)

Improving measurements of SF₆ for the study of atmospheric transport and emissions [PDF]

Atmospheric Measurement Techniques, 2011
Sulfur hexafluoride (SF6) is a potent greenhouse gas and useful atmospheric tracer. Measurements of SF6 on global and regional scales are necessary to estimate emissions and to verify or examine the performance of atmospheric transport models.
D. F. Hurst, F. L. Moore, J. H. Butler, M. Rigby, J. D. Nance, D. J. Mondeel, G. S. Dutton, B. D. Hall, J. W. Elkins   +8 more
doaj   +6 more sources

Evaluation of 99 Pesticide Residues in Major Agricultural Products from the Western Highlands Zone of Cameroon Using QuEChERS Method Extraction and LC-MS/MS and GC-ECD Analyses. [PDF]

Foods, 2018
There is no information available on pesticide residue levels in major food commodities harvested in Cameroon, especially from the western highlands region, the food basket of the country.
Galani JHY, Houbraken M, Wumbei A, Djeugap JF, Fotio D, Spanoghe P.   +5 more
europepmc   +5 more sources

In Silico Prediction, Molecular Docking and Dynamics Studies of Steroidal Alkaloids of Holarrhena pubescens Wall. ex G. Don to Guanylyl Cyclase C: Implications in Designing of Novel Antidiarrheal Therapeutic Strategies

Molecules, 2021
The binding of heat stable enterotoxin (STa) secreted by enterotoxigenic Escherichia coli (ETEC) to the extracellular domain of guanylyl cyclase c (ECDGC-C) causes activation of a signaling cascade, which ultimately results in watery diarrhea. We carried
Neha Gupta, Saurav Kumar Choudhary, Neeta Bhagat, Muthusamy Karthikeyan, Archana Chaturvedi   +4 more
doaj   +1 more source

A comparison of the effectiveness of QuEChERS, FaPEx and a modified QuEChERS method on the determination of organochlorine pesticides in ginseng.

PLoS ONE, 2021
This study provides a review of methods used in the determination of organochlorine pesticides (OCPs) in ginseng and compares the effectiveness of three extraction methods (Quick, Easy, Cheap, Effective, Rugged, and Safe (QuEChERS), a modified QuEChERS ...
Pennante Bruce-Vanderpuije, David Megson, Song-Hee Ryu, Geun-Hyoung Choi, Sang-Won Park, Byung-Seok Kim, Jin Hyo Kim, Hyo-Sub Lee   +7 more
doaj   +1 more source

MONITORING OF PESTICIDE RESIDUES IN RIVER NILE WATER FROM EGYPT BY SOLID-PHASE EXTRACTION FOLLOWED BY GAS CHROMATOGRAPHY AND GAS CHROMATOGRAPHY–MASS SPECTROSCOPY [PDF]

Arab Universities Journal of Agricultural Sciences, 2005
Solid-phase extraction (SPE), gas chromatography electron capture detector (GC-ECD) and gas chromatography nitrogen-phosphorous detector (GC-NPD) and gas chromatography–mass spectroscopy (GC-MS) were applied for trace-level de-termination of 20 ...
Hanaa Ali, M Osman, T Potter, M Mohamed
doaj   +1 more source

Levels of organochlorine contaminants in natural bovine milk marketed in Mojuí dos Campos and Belterra, Brazil

Acta Scientiarum: Animal Sciences, 2023
Analyzing the organochlorine pesticide (OCP) content in milk is relevantbecause it helps evaluate the quality of milk that reaches the consumer's table and also helps identify the geographical areas where there is a high possibility of contamination ...
Isabella Clarissa Vasconcelos Rêgo, Julio César Amaral Cardoso, José Augusto Amorim Silva do Sacramento, Márcia Mourão Ramos Azevedo, Joseph Simões Ribeiro, Ruy Bessa Lopes, Lucinewton Silva de Moura, Rosivaldo de Alcântara Mendes, Paulo Sérgio Taube   +8 more
doaj   +1 more source

A novel, cost-effective analytical method for measuring high-resolution vertical profiles of stratospheric trace gases using a gas chromatograph coupled with an electron capture detector [PDF]

Atmospheric Measurement Techniques, 2023
The radiative balance of the upper atmosphere is dependent on the magnitude and distribution of greenhouse gases and aerosols in that region. Climate models predict that with increasing surface temperature, the primary mechanism for transporting ...
J. Li, J. Li, B. C. Baier, F. Moore, F. Moore, T. Newberger, T. Newberger, S. Wolter, S. Wolter, J. Higgs, G. Dutton, G. Dutton, E. Hintsa, E. Hintsa, B. Hall, C. Sweeney   +15 more
doaj   +1 more source

Simultaneous Determination of Eight Pesticide Residues in Cowpeas by GC–ECD [PDF]

Journal of Chromatographic Science, 2016
A sensitive and effective method, using gas chromatography (GC) and an electron capture detector (ECD), for the simultaneous quantitative determination of bifenthrin, chlorothalonil, cyfluthrin, cypermethrin, difenoconazole, fenvalerate, procymidone and pyridaben residues in cowpea was developed and validated.
Zhi, Xu, Zhibo, Huan, Jinhui, Luo, Defang, Xie   +3 more
openaire   +2 more sources

An optimized analytical method for the simultaneous detection of iodoform, iodoacetic acid, and other trihalomethanes and haloacetic acids in drinking water [PDF]

, 2013
An optimized method is presented using liquid-liquid extraction and derivatization for the extraction of iodoacetic acid (IAA) and other haloacetic acids (HAA9) and direct extraction of iodoform (IF) and other trihalomethanes (THM4) from drinking water ...
He, G, Jiang, S, Liu, X, Qu, W, Templeton, MR, Wei, X, Zheng, W   +6 more
core   +3 more sources

High-precision analysis of SF₆ at ambient level [PDF]

Atmospheric Measurement Techniques, 2013
This work reports on the development of a technique for the precise analysis of ambient SF6. This technique, which involves a gas chromatograph/electron capture detector (GC-ECD) coupled with an Activated Alumina-F1 (AA-F1) column, performed well in the ...
J. S. Lim, D. M. Moon, J. S. Kim, W.-T. Yun, J. Lee   +4 more
doaj   +1 more source