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3 results on '"Mark Xavier"'

2. Polyaniline-based cadaverine sensor through digital image colorimetry.

Author

Ocampo, Alessandria Maeve, Santos, Lee Romney, Julian, Sam, Bailon, Mark Xavier, and Bautista, Joel

Subjects
POLYANILINES, CHEMICAL detectors, DIGITAL image processing, COLORIMETRY, BIOGENIC amines
Abstract

The detection of biogenic amines is important due to the their correlation with spoilage and toxicity. Polyaniline (PANI) is a polymer capable of changing color from blue to green and vice versa through acid-base reactions. This study tested the potential of PANI as a sensing material for the presence of cadaverine. PANI was fabricated on nylon cloths through the redox reaction of aniline and ammonium persulfate. The PANI-coated nylon cloths were exposed to different amounts of cadaverine in a fixed reaction time of 5 min. Through digital image colorimetry, plots of the different color values vs. concentration were prepared and the curve with the highest linearity was obtained using the yellow value. Values for limit of detection (LOD) and limit of quantification (LOQ) were calculated to be 0.8816 mm and 2.9386 mm, respectively. An Android application which analyzes the color values of the PANI image in relation to the amount of cadaverine was also developed. [ABSTRACT FROM AUTHOR]

Published
2018
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3. Abdominal aortic aneurysm

Author

Tarafdar, Suhail Amin and Gannon, Mark Xavier

Abstract

An abdominal aortic aneurysm (AAA) is defined as a localised dilation of the abdominal aorta. It tends to occur in men between 65 and 79 years of age, and is more common in smokers. Although frequently asymptomatic, an AAA can cause abdominal, groin or back pain. The fatality rate for ruptured AAAs is 90%. In the UK, an ultrasound screening programme for AAAs is now offered to men aged 65 years and over. Management involves surveillance, optimisation of cardiovascular risk status and surgical intervention. However, patients should also be made aware of the Driver and Vehicle Licensing Authority rules as these may prevent them from driving.

Published
2017
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