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Articles by mark Tarn
Arctic cloud condensation nuclei enhanced by iodine, sulfur and organic precursors
Abstract New particle formation is an important source of Arctic atmospheric particles and cloud condensation nuclei, yet their precursor sources and molecular-level mechanisms remain poorly understood. Here we report comprehensive ship-based observations from 19 May to 26 June 2022 from southeastern to western Greenland and into the Davis Strait’s marginal ice zone to investigate sources and processes controlling atmospheric particles and cloud condensation nuclei.
Mental health at work: societal, economic and health imperatives align; it's time to act
Concern about the health of our working population has never been greater.
On-chip density-based sorting of supercooled droplets and frozen droplets in continuous flow
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On-chip analysis of atmospheric ice-nucleating particles in continuous flow
On-chip analysis of atmospheric ice-nucleating particles in continuous flow†‡ Mark D. Tarn, *ab Sebastien N. F. Sikora, a Grace C. E. Porter, ab Bethany V. Wyld, a Matan Alayof,c Naama Reicher, c Alexander D. Harrison, a Yinon Rudich, c Jung-uk Shim *b and Benjamin J.
What should be done to support the mental health of healthcare staff treating COVID-19 patients?
Derek K. Tracy (a1), Mark Tarn (a2), Rod Eldridge (a2), Joanne Cooke (a2), James D.F. Calder (a3) and Neil Greenberg (a4)...
From moral injury to mental illness: we must protect the wellbeing of frontline covid-19 staff
A recent article in The BMJ highlighted the mental health challenges faced by healthcare workers in the covid-19 pandemic. The authors discussed the risks of “Moral injury” which may become the signature injury for healthcare staff dealing with the covid-19 pandemic. Derived from the military, it describes the ethical and moral suffering arising from experiences which strongly clash with one’s moral code.
High-speed imaging of ice nucleation in water proves the existence of active sites
Abstract Understanding how surfaces direct nucleation is a complex problem that limits our ability to predict and control crystal formation. We here address this challenge using high-speed imaging to identify and quantify the sites at which ice nucleates in water droplets on the two natural cleavage faces of macroscopic feldspar substrates. Our data show that ice nucleation only occurs at a few locations, all of which are associated with micron-size surface pits.
Microcapsules as assay compartments formed through layer-by-layer deposition
We investigate the potential of using microcapsules, generated through layer-by-layer assembly, as reaction compartments for bioassays. A streptavidin-biotin and an esterase-fluorescein diacetate (FDA) assay were employed for proof-of-concept. Streptavidin was incorporated into the microcapsules via two methods: (i) physical adsorption onto MnCO3 microcrystal templates or (ii) co-precipitation with CaCO3 to form mixed microcrystals.
Correction: On-chip polyelectrolyte coating onto magnetic droplets - towards continuous flow assembly of drug delivery capsules
a School of Mathematics and Physical Sciences, University of Hull, Cottingham Road, Hull, UK E-mail: n.pamme@hull.ac.uk Tel: +44 (0)1482 465027 b Department of Chemical and Biomolecular Engineering, University of Cantabria, Av. de los Castros s/n, 39005 Santander, Spain
On-chip polyelectrolyte coating onto magnetic droplets - Towards continuous flow assembly of drug delivery capsules
Polyelectrolyte (PE) microcapsules for drug delivery are typically fabricated via layer-by-layer (LbL) deposition of PE layers of alternating charge on sacrificial template microparticles, which usually requires multiple incubation and washing steps that render the process repetitive and time-consuming.
Development of radiodetection systems towards miniaturised quality control of PET and SPECT radiopharmaceuticals
The ability to detect radiation in microfluidic devices is important for the on-chip analysis of radiopharmaceuticals, but previously reported systems have largely suffered from various limitations including cost, complexity of fabrication, and insufficient sensitivity and/or speed.
Positron detection in silica monoliths for miniaturised quality control of PET radiotracers
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Microfluidically Fabricated pH-Responsive Anionic Amphiphilic Microgels for Drug Release
Amphiphilic microgels of different composition based on the hydrophilic, pH-responsive acrylic acid (AA) and the hydrophobic, non-ionic n-butyl acrylate (BuA) were synthesised using a lab-on-a-chip device. Hydrophobic droplets were generated via a microfluidic platform that contained a protected form of AA, BuA, the hydrophobic crosslinker, ethylene glycol dimethacrylate (EGDMA), and a free radical initiator in an organic solvent.
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