A nebuliser and spray chamber have been used to link a flow injection analyser to a flame ionisation detector, with the potential for the combination to be used as a universal detector for liquid chromatography. The hydrogen and air flows were adjusted to achieve a stable system. The detector responded to both volatile and involatile analytes and to compounds with and without chromophores, including alkanes, alkanols, aromatic amides and acids, phenols, amino-acids and carbohydrates and gave a linear response for many analytes. However, for involatile polar analytes it was necessary to add traces of acid or salt to the carrier stream to obtain a linear response.
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http://dx.doi.org/10.1016/j.chroma.2012.02.033 | DOI Listing |
J Clin Endocrinol Metab
January 2025
Division of Orthogenetics, Department of Pediatrics, Nemours Children's Hospital, Delaware, 1600 Rockland Road, Wilmington, DE, 19803, USA.
Achondroplasia is the most common disproportionate short-stature skeletal dysplasia. Features associated with achondroplasia are rhizomelia, macrocephaly, midface hypoplasia, and typical cognition. Potential medical complications include foramen magnum stenosis, hydrocephalus, middle ear dysfunction, obstructive and central sleep apnea, spinal stenosis and genu varum.
View Article and Find Full Text PDFAm J Speech Lang Pathol
January 2025
Department of Therapy Services, University of Virginia Health System, Charlottesville.
Purpose: Research has shown that prolonged endotracheal intubation can increase risk of aspiration following extubation. This study examined the relationship between swallowing and intubation among patients with COVID-19. We investigated the association between the duration of intubation and time until an oral diet was safely initiated and the correlation between the length of intubation and reduced sensation with aspiration as seen on flexible endoscopic evaluation of swallowing (FEES)/videofluoroscopic swallowing study (VFSS).
View Article and Find Full Text PDFDrugs Aging
January 2025
Department of Military and Emergency Medicine, Uniformed Services University, Bethesda, MD, USA.
Background: Untreated low back pain (LBP) in older adults can lead to disability and development of chronicity. Due to the potential development of medical comorbidities and negative risks associated with pharmacological use, chronic LBP management for older adults requires a responsive approach.
Methods: The objective of this study is to evaluate the probability of (1) opioid prescription receipt and (2) opioid-sedative coprescription, in a sample of military-service-connected patients enrolled in the Veterans Health Administration (VHA) or TRICARE, ages 30-85 years, receiving care in three systems: VHA, Military Health System (MHS), and nonfederal (civilian) healthcare facilities.
Brain Struct Funct
January 2025
Department of Psychiatry, Psychotherapy and Psychosomatics, School of Medicine, RWTH Aachen University, Aachen, Germany.
Physiological responses derived from audiovisual perception during assisted driving are associated with the regulation of the autonomic nervous system (ANS), especially in emergencies. However, the interaction of event-related brain activity and the ANS regulating peripheral physiological indicators (i.e.
View Article and Find Full Text PDFJ Neurol
January 2025
Jacobs Comprehensive MS Treatment and Research Center, Department of Neurology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, NY, USA.
Background: Previous investigations on optical coherence tomography (OCT) in multiple sclerosis (MS) focused on generalizable macular and peri-papillary regions without considering the anatomic variations of the retinal layer thickness.
Objective: This study aimed to assess the utility of parafoveal retinal layer thickness measured by OCT, underscoring its relationships with clinical outcomes in MS.
Methods: In this cross-sectional study, 214 people with MS (pwMS) and 57 age- and sex-matched healthy controls (HCs) were enrolled.
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