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Real-Time Optogenetics System for Controlling Gene Expression Using a Model-Based Design.

Author(s): Soffer G, Perry JM, Shih SCC

Optimization of engineered biological systems requires precise control over the rates and timing of gene expression. Optogenetics is used to dynamically control gene expression as an alternative to conventional chemical-based methods since it provides a mor...

Article GUID: 33543619
Increased oxidative modifications of amniotic fluid albumin in pregnancies associated with gestational diabetes mellitus.

Author(s): Boisvert MR, Koski KG, Skinner CD

Anal Chem. 2010 Feb 01;82(3):1133-7 Authors: Boisvert MR, Koski KG, Skinner CD

Article GUID: 20063865
Development of a particle-trap preconcentration-soft ionization mass spectrometric technique for the quantification of mercury halides in air

Author(s): Deeds DA; Ghoshdastidar A; Raofie F; Guérette ÉA; Tessier A; Ariya PA;

Measurement of oxidized mercury, Hg(II), in the atmosphere poses a significant analytical challenge as Hg(II) is present at ultra-trace concentrations (picograms per cubic meter air). Current technologies are sufficiently sensitive to measure the total Hg p...

Article GUID: 25837315
Integration of World-to-Chip Interfaces with Digital Microfluidics for Bacterial Transformation and Enzymatic Assays.

Author(s): Moazami E, Perry JM, Soffer G, Husser MC, Shih SCC

Anal Chem. 2019 Apr 16;91(8):5159-5168 Authors: Moazami E, Perry JM, Soffer G, Husser MC, Shih SCC

Article GUID: 30945840
Analyzing the Biochemical Alteration of Green Algae During Chronic Exposure to Triclosan Based on Synchrotron-Based Fourier Transform Infrared Spectromicroscopy.

Author(s): Xin X, Huang G, An C, Weger H, Cheng G, Shen J, Rosendahl S

Anal Chem. 2019 May 31;: Authors: Xin X, Huang G, An C, Weger H, Cheng G, Shen J, Rosendahl S

Article GUID: 31117408
Title:Development of a particle-trap preconcentration-soft ionization mass spectrometric technique for the quantification of mercury halides in air
Authors:Deeds DA,  Ghoshdastidar A,  Raofie F,  Guérette ÉA,  Tessier A,  Ariya PA, 
Link:https://pubmed.ncbi.nlm.nih.gov/25837315/
DOI:10.1021/ac504545w
Category:Anal Chem
PMID:25837315
Dept Affiliation: MASSSPEC
1 †Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, Quebec H3A 2K6, Canada.
2 ‡Department of Chemistry, McGill University, Montreal, Quebec H3A 2K6, Canada.
3 ?Centre for Biological Applications of Mass Spectrometry, Concordia University, Montreal, Quebec, Canada.

Description:

Measurement of oxidized mercury, Hg(II), in the atmosphere poses a significant analytical challenge as Hg(II) is present at ultra-trace concentrations (picograms per cubic meter air). Current technologies are sufficiently sensitive to measure the total Hg present as Hg(II) but cannot determine the chemical speciation of Hg(II). We detail here the development of a soft ionization mass spectrometric technique coupled with preconcentration onto nano- or microparticle-based traps prior to analysis for the measurement of mercury halides in air. The current methodology has comparable detection limits (4-11 pg m(-3)) to previously developed techniques for the measurement of total inorganic mercury in air while allowing for the identification of HgX2 in collected samples. Both mercury chloride and mercury bromide have been sporadically detected in Montreal urban and indoor air using atmospheric pressure chemical ionization-mass spectrometry (APCI-MS). We discuss limitations and advantages of the current technique and discuss potential avenues for future research including quantitative trace measurements of a larger range of mercury compounds.