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Temporal Evolution of Interparticle Potentials of PMMA Colloids in CHB/Decalin.
Langmuir
August 2024
Department of Chemistry, Universität Konstanz, D-78457 Konstanz, Germany.
Colloidal dispersions composed of polymethylmetacrylate particles dispersed in a mixture of cyclohexyl bromide and decalin find widespread use as model systems in optical microscopy experiments. While the system allows simultaneous density and refractive index matching, preparing particles with hard potentials remains challenging, and strong variations in the physical parameters of samples prepared in the same manner are commonly observed. Here, we present data on the measurement of forces between individual pairs of particles in highly diluted dispersions over the course of tens of days using the blinking optical tweezers method.
View Article and Find Full Text PDFSpin echo small-angle neutron scattering using superconducting magnetic Wollaston prisms.
Rev Sci Instrum
July 2024
Neutron Technologies Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA.
We show the implementation of superconducting magnetic Wollaston prisms for spin echo small-angle neutron scattering. Two calibration methods for the spin echo length are presented: one utilizing spin echo modulated small-angle neutron scattering and the other based on the neutron refraction by quartz wedge crystals. Our experimental results with polystyrene nano-particle colloids showcase the system's efficacy in measuring both dilute and concentrated colloidal systems.
View Article and Find Full Text PDFWhile bright terahertz sources are used to perform nonlinear experiments, they can be advantageous for high-precision linear measurements of opaque samples. By placing the sample away from the focus, nonlinearities can be suppressed, and sizeable amounts of transmitted radiation detected. Here, this approach is demonstrated for a 0.
View Article and Find Full Text PDFTransepithelial Photorefractive Keratectomy-Review.
Vision (Basel)
March 2024
University Hospitals Sussex NHS Foundation Trust, Eastern Road, Brighton BN2 5BF, UK.
The type and nature of refractive surgery procedures has greatly increased over the past few decades, allowing for almost all patient populations to be treated to extremely high satisfaction. Conventional photorefractive keratectomy involves the removal of the corneal epithelium through mechanical debridement or dilute alcohol instillation. An improvement to this method utilises laser epithelial removal in a single-step process termed transepithelial photorefractive keratectomy (transPRK).
View Article and Find Full Text PDFComparison Between Moxifloxacin and Chloramphenicol for the Treatment of Bacterial Eye Infections.
Curr Ther Res Clin Exp
February 2024
Department of Chemical, Pharmaceutical, and Agricultural Science, University of Ferrara, Ferrara, Italy.
Article Synopsis
- Moxifloxacin and chloramphenicol are two antibiotics tested for their effectiveness against certain bacteria related to eye conditions, with moxifloxacin being used more recently for ocular treatments.
- The study assessed their antibacterial properties and cytotoxic effects on human corneal cells using various laboratory methods, revealing significant differences in their performance.
- Results indicated that moxifloxacin caused less harm to corneal cells, had a lower minimum inhibitory concentration, and was more effective at preventing and disrupting biofilms than chloramphenicol.
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