Results 31 to 40 of about 2,451,911 (303)

Determination of atrazine residues in alfalfa plant matrix by ultra-high-performance liquid chromatography and tandem mass spectrometry

Карантин і захист рослин
Goal. The purpose of this study was to verify the effectiveness of determination of atrazine residues in alfalfa using ultra-high-performance liquid chromatography and tandem mass spectrometry. Methods.
Yinghui Zhu, T. Rozhkova
doaj   +1 more source

Quantum state magnification

, 2016
Quantum metrology exploits entangled states of particles to improve sensing precision beyond the limit achievable with uncorrelated particles. All previous methods required detection noise levels below this standard quantum limit to realize the benefits ...
Engelsen, N. J., Hosten, O., Kasevich, M. A., Krishnakumar, R.   +3 more
core   +1 more source

Tunable sensor response by voltage-control in biomimetic hair flow sensors [PDF]

, 2013
We present an overview of improvements in detection limit and responsivity of our biomimetic hair flow sensors by electrostatic spring-softening (ESS). Applying a DC-bias voltage to our capacitive flow sensors improves the responsively by up to 80% for ...
Bruinink, Christiaan M., Droogendijk, Harmen, Krijnen, Gijs J.M., Sanders, Remco G.P.   +3 more
core   +5 more sources

Accuracy of Expired BinaxNOW Rapid Antigen Tests

Microbiology Spectrum, 2023
The widespread existence of expired antigen testing kits in households and potential coronavirus outbreaks necessitates evaluating the reliability of these expired kits.
Mary Jane E. Vaeth, Omar Abdullah, Minahil Cheema, Kristie Sun, Maryam Elhabashy, Asia Mitchell, Maisha Foyez, Mahita Talla, Aamna Cheema, Charles Locke, Melinda Kantsiper, Andrew Pekosz, Heba H. Mostafa, Zishan K. Siddiqui   +13 more
doaj   +1 more source

Narrow scope for resolution-limit-free community detection

, 2011
Detecting communities in large networks has drawn much attention over the years. While modularity remains one of the more popular methods of community detection, the so-called resolution limit remains a significant drawback.
M. A. Porter, P. Van Dooren, V. A. Traag, Y. Nesterov   +3 more
core   +1 more source

Limits to the Mass and the Radius of the Compact Star in SAX J1808.4--3658 and Their Implications [PDF]

, 2001
We show that a survey of equations of state and observations of X-ray pulsations from SAX J1808.4-3658 give 2.27 solar mass as the upper limit of the compact star mass. The corresponding upper limit of the radius comes out to be 9.73 km.
Baldo M., Bondi H., Ergma E., Gilfanov M., Sudip Bhattacharyya   +4 more
core   +2 more sources

Disposable solid-contact ion-selective electrodes for environmental monitoring of lead with ppb [PDF]

, 2012
Solid-contact Pb2+-selective-electrodes and solid contact reference electrodes suitable for use as disposable sensing devices for environmental monitoring of lead have been prepared on screen-printed substrates.
Aleksandar Radu, Anastasova, Bakker, Bakker, Bakker, Bakker, Bakker, Benito-Lopez, Bobacka, Bobacka, Bobacka, Byrne, Cadogan, Carroll, Ceresa, Ceresa, Chernyshov, Claudio Zuliani, Dermot Diamond, Diamond, Diamond, Diamond, Diamond, Garcia-Cordero, Giusy Matzeu, Groenendaal, Heywang, Johan Bobacka, Kakiuchi, Lindner, Mattinen, Michalska, Radu, Radu, Renedo, Salzitsa Anastasova, Slaveykova, Sokalski, Sutter, Ulriika Mattinen, Vazquez   +40 more
core   +1 more source

Comparative analysis of Access PCT and Elecsys BRAHMS PCT assays for procalcitonin measurements [PDF]

Kosin Medical Journal
Background Procalcitonin (PCT) is a crucial biomarker for diagnosing sepsis and managing antibiotic therapy. This study evaluated the analytical performance and comparability of the Access PCT and Elecsys BRAHMS PCT assays.
Hyunji Choi, Sang-Shin Lee, Hyunyong Hwang   +2 more
doaj   +1 more source

Mixed models for longitudinal left-censored repeated measures

, 2004
Longitudinal studies could be complicated by left-censored repeated measures. For example, in Human Immunodeficiency Virus infection, there is a detection limit of the assay used to quantify the plasma viral load.
Genz, Genz, Gilks, Hughes, Hélène Jacqmin-Gadda, Jacqmin-Gadda, Laird, Lesaffre, Lyles, Lynn, Marquardt, Marschner, Moulton, Paxton, Pinheiro, Rodolphe Thiébaut, Singh, Thiébaut, Thiébaut   +18 more
core   +4 more sources

Tratamento de dados censurados em estudos ambientais

Química Nova, 2014
Due to the inherent limitations of the analytical methods of measurement, environmental exposure data often present observations described as below a certain detection limit, also called left-censored data. Censored data directly interferes in almost all
Cristiano Christofaro, Mônica M. D. Leão   +1 more
doaj   +1 more source