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Colorimetric Analyses of the Optic Nerve Head and Retina Indicate Increased Blood Flow After Vitrectomy.
Transl Vis Sci Technol
July 2024
Department of Ophthalmology, Edward S. Harkness Eye Institute, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, NY, USA.
Purpose: The purpose of this study was to evaluate the impact of vitrectomy and posterior hyaloid (PH) peeling on color alteration of optic nerve head (ONH) and retina as a surrogate biomarker of induced perfusion changes.
Methods: Masked morphometric and colorimetric analyses were conducted on preoperative (<1 month) and postoperative (<18 months) color fundus photographs of 54 patients undergoing vitrectomy, either with (44) or without (10) PH peeling and 31 years of age and gender-matched control eyes. Images were calibrated according to the hue and saturation values of the parapapillary venous blood column.
Alterations of lacrimal sac vasculature in lacrimal disorders: Chromo endoscopic assessment with changes in effective spectral response.
J Fr Ophtalmol
March 2024
Govindram Seksaria Institute of Dacryology, L.V. Prasad Eye Institute, Road No 2, Banjara Hills, 500034 Hyderabad, India. Electronic address:
Purpose: To study the structural and dynamic alterations in the lacrimal sac vasculature of patients with congenital, primary, and secondary acquired nasolacrimal duct obstructions (CNLDO, PANDO, SANDO) and patients with acute dacryocystitis (AD) and failed dacryocystorhinostomy (DCR).
Methods: A prospective study was performed on 65 consecutive lacrimal sacs following their complete exposure during endoscopic dacryocystorhinostomy. High magnification chromo endoscopy and changes in effective spectral response was achieved using the Storz professional image enhancement system (SPIES®).
Model calculations and measurements of shooting sound in practical situations.
J Acoust Soc Am
February 2024
TNO Acoustics and Sonar, Oude Waalsdorperweg 63, 2597 AK, The Hague, The Netherlands.
Shooting sound in practical situations with propagation distances up to 300 m is investigated by means of model calculations and measurements. The results illustrate uncertainties in the model calculations for practical situations. The measurements were performed with various small-caliber weapons.
View Article and Find Full Text PDFA feasibility study of direct analysis in real time-mass spectrometry for screening organic gunshot residues from various substrates.
Anal Methods
September 2023
Department of Chemistry, West Virginia University, Morgantown, WV 26506, USA.
This study reports the use of direct analysis in real time-mass spectrometry (DART-MS) for the detection of organic gunshot residues (OGSR) in a variety of matrices of interest for forensics, customs, and homeland security. Detection limits ranged from (0.075 to 12) ng, with intra- and inter-day reproducibility below 0.
View Article and Find Full Text PDFRaman spectroscopy analysis and chemometric study of organic gunshot residues originating from two types of ammunition.
Forensic Sci Int
August 2019
UER Procédés Energétiques, Ecole Militaire Polytechnique EMP, BP. 17, Bordj-el-Bahri, Algiers, Algeria. Electronic address:
The detection and analysis of gunshot residues expelled during the discharge of the weapon play a potential role in criminal investigations. In this work, organic gunshot residues produced by using automatic rifle Kalashnikov caliber: 7.62×39mm and semi-automatic pistol Makarov caliber: 9×18mm were studied using Raman spectrometry.
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