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Stephanie Tow, Desi Carozza, Kim Barker
A 48 year-old man with lung squamous cell carcinoma was admitted to acute care with cognitive impairment after recent chemotherapy. He developed myoclonus, ataxia, agitation, and visual hallucinations. Morvan's Syndrome, a rare voltage-gated potassium channel antibody disorder characterized by neuromyotonia with central nervous system dysfunction, was eventually diagnosed. He received plasmapheresis and was admitted to inpatient rehabilitation, where he safely participated in therapies. By focusing on neuromuscular rehabilitation, balance training, fine motor skills, and cognitive retraining emphasizing skills relevant to the patient's premorbid cognitive activities, the patient demonstrated significant functional improvement, decreasing the burden of care of his caregivers...
December 5, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
Swathy Jakka Ravindran, Ramesh Kumar, Amitava Srimany, Ligy Philip, Thalappil Pradeep
By direct analysis of water purification membranes using ambient ionization mass spectrometry, an attempt has been made to understand the molecular signatures of bacterial fouling. Membrane based purification methods are used extensively in water treatment and a major challenge for them is biofouling. The build-up of microbes and their extracellular polymeric matrix clog the membranes and reduce their efficiency. To understand the early stages of bacterial fouling on water purification membranes, we have used Desorption Electrospray Ionization Mass Spectrometry (DESI MS), where ion formation occurs in ambient conditions and the ionization event is surface sensitive...
December 6, 2017: Analytical Chemistry
Nethaji J Gallage, Kirsten Jørgensen, Christian Janfelt, Agnieszka J Z Nielsen, Thomas Naake, Eryk Dunski, Lene Dalsten, Michel Grisoni, Birger Lindberg Møller
Vanillin is the most important flavour compound in the vanilla pod. VpVAN catalyzes the conversion of ferulic acid and ferulic acid glucoside into vanillin and vanillin glucoside, respectively. Desorption Electrospray Ionization Mass Spectrometry Imaging (DESI-MSI) of vanilla (Vanilla planifolia) pod sections demonstrate that vanillin glucoside is preferentially localized within the mesocarp and placental laminae whereas vanillin is preferentially localized within the mesocarp. VpVAN is present as the mature form (25 kDa) but dependent on tissue and isolation procedure small amounts of the immature unprocessed form (40 kDa) and putative oligomers (50, 75 and 100 kDa) may be observed by immunoblotting using an antibody specific to the C-terminal sequence of VpVAN...
November 24, 2017: Plant & Cell Physiology
Tyler J Yarger, Elizabeth M Yuill, Lane A Baker
We introduce probe-substrate distance (Dps)-control to desorption electrospray ionization (DESI) and report a systematic investigation of key experimental parameters. Examination of voltage, flow rate, and nebulizing gas pressure suggests as Dps decreases, the distance-dependent spray current increases, until a critical point. At the critical point the relationship inverts, and the spray current decreases as the probe moves closer to the surface due to constriction of solution flow by the nebulizing gas. Dps control was used to explore the use of spray current as a signal for feedback positioning, while mass spectrometry imaging was performed simultaneously...
November 27, 2017: Journal of the American Society for Mass Spectrometry
Desy Ayu Wardani, Imami Nur Rachmawati, Dewi Gayatri
Pregnant teens often feel uncertain in the last trimester about their ability to take care of their baby. At this time, maternal confidence in the ability to care for the baby is an important step in the preparation for becoming a mother. The purpose of this study was to examine the validity and reliability of an Indonesian version of the Young Adult Maternal Confidence Scale (YAMCS) as an instrument to measure maternal self-efficacy of pregnant teens in the last trimester. The study consisted of 90 pregnant teens, age of respondents less than 19 years and living in 1 of 3 sub-districts: Cilember, Sukamanah and Megamendung, Bogor Regency...
2017: Comprehensive Child and Adolescent Nursing
Saima Majeed, Mazhar Iqbal, Muhammad Rafique Asi, Shahzad Zafar Iqbal, Jinap Selamat
Recently, cultivation of high-yielding hybrid maize varieties has revolutionized maize production in Pakistan. Analyses of nutritional traits and aflatoxin (AF) contamination in these varieties can aid in the identification of susceptible and resistant varieties, particularly for cultivation in the Pakistani agro-climatic environment. Five spring maize varieties-Pioneer, Neelam, DK-919, Desi, and Hi-maize-were selected for analyses of their nutritional, tocopherol, and AF contents. Protein, carbohydrate, oil, ash, fiber, and moisture contents ranged between 8...
November 14, 2017: Journal of Food Protection
Elizabeth A Crawford, Stefanie Gerbig, Bernhard Spengler, Dietrich A Volmer
Ambient ionization techniques are typically used to analyze samples in their native states with minimal or no sample pretreatment prior to mass spectrometric (MS) analysis. Desorption electrospray ionization (DESI) and direct analysis in real time (DART) were systematically investigated in this work for direct solid analysis of depolymerized lignin samples, with the goal of rapidly fingerprinting these samples, to efficiently characterize the subunits of this renewable energy source. High resolution MS was required for enhanced selectivity in this study due to the inherent structural complexity of lignin...
November 22, 2017: Analytica Chimica Acta
Jonatan Hall-Andersen, Svend G Kaasgaard, Christian Janfelt
Most modern laundry detergents contain enzymes such as proteases, amylases, and lipases for more efficient removal of stains containing proteins, carbohydrates, and lipids during wash at low temperature. The function of the lipases is to hydrolyse the hydrophobic triglycerides from fats and oils to the more hydrophilic lipids diglycerides, monoglycerides and free fatty acids. Here, we use MALDI imaging to study the effect of enzymatic degradation of triglycerides by lipases directly on the textile surface. Textile samples were created by using swatches of different textile blends, adding a lipid stain and simulating washing cycles using well-defined detergents with lipase concentrations ranging between 0 and 0...
November 6, 2017: Chemistry and Physics of Lipids
Cedric D'Hue, Michael Moore, Don-John Summerlin, Alan Jarmusch, Clint Alfaro, Avinash Mantravadi, Arnaud Bewley, D Gregory Farwell, R Graham Cooks
Rationale Desorption electrospray ionization-mass spectrometry (DESI-MS) has demonstrated utility in differentiating tumor from adjacent normal tissue in both urologic and neurosurgical specimens. We sought to evaluate if this technique had similar accuracy in differentiating oral tongue squamous cell carcinoma (SCC) from adjacent normal epithelium due to current issues with late diagnosis of SCC in advanced stages. METHODS: Fresh frozen samples of SCC and adjacent normal tissue were obtained by surgical resection...
October 27, 2017: Rapid Communications in Mass Spectrometry: RCM
Francisca Diana da Silva Araújo, Daiene Souza Santos, Carolina Clepf Pagotto, Welington Luiz de Araújo, Marcos Nogueira Eberlin
The bacteria of the genus Curtobacterium are usually seen as plant pathogen, but some species have been identified as endophytes of different crops, and could as such present a potential for disease control and plant growth promotion. We have therefore applied the desorption electrospray ionization mass spectrometry imaging (DESI-MSI) in the direct analysis of living Curtobacterium sp. strain ER1/6 colonies to map the surface metabolites, and electrospray ionization tandem mass spectrometry (ESI-MS/MS) for characterization of these compounds...
October 27, 2017: Journal of Mass Spectrometry: JMS
Jessica Landino, Amy J Jnah, Desi M Newberry, Sabine C Iben
Rhizomelic chondrodysplasia punctata (RCDP) is a rare genetic peroxisome biogenesis disorder with a reported incidence of 1 in 100 000 live births. The 3 genetic subtypes of RCDP are acquired by an autosomal recessive inheritance pattern. RCDP type 1 accounts for greater than 90% of all aggregate cases. Differentiating between the 3 subtypes of RCDP, as well as disorders characterized by similar punctate cartilaginous changes, is essential to guide an appropriate postnatal plan of care. Management strategies are focused toward associated clinical manifestations and require an interdisciplinary approach including ophthalmology, cardiovascular, endocrine, physical and occupational therapy, and neurology...
October 2017: Journal of Perinatal & Neonatal Nursing
Xiangtang Li, Rui Xu, Xin Wei, Hankun Hu, Shulin Zhao, Yi-Ming Liu
Signal suppression by sample matrix in direct electrospray ionization-mass spectrometric (ESI-MS) analysis hampers its clinical and biomedical applications. We report herein the development of a microfluidic voltage-assisted liquid desorption electrospray ionization (VAL-DESI) source to overcome this limitation. Liquid DESI is achieved for the first time in a microfluidic format. Direct analysis of urine, serum, and cell lysate samples by using the proposed microfluidic VAL-DESI-MS/MS method to detect chemical compounds of biomedical interest, including nucleosides, monoamines, amino acids, and peptides is demonstrated...
November 21, 2017: Analytical Chemistry
Miina Ruokolainen, Ville Miikkulainen, Mikko Ritala, Tiina Sikanen, Tapio Kotiaho, Risto Kostiainen
We present a new high-throughput platform for studying titanium dioxide (TiO2) photocatalytic oxidation reactions by performing reactions on a TiO2-coated surface, followed by direct analysis of oxidation products from the surface by desorption electrospray ionization mass spectrometry (DESI-MS). For this purpose, we coated a round glass wafer with photocatalytically active anatase-phase TiO2 using atomic layer deposition. Approximately 70 aqueous 1 μL samples can be injected onto the rim of the TiO2-coated glass wafer, before the entire wafer is exposed to UV irradiation...
November 7, 2017: Analytical Chemistry
Mark Busman
Ambient ionization represents a new generation of MS ion sources and is used for the rapid ionization of smallmolecules under ambient conditions. The combination of ambient ionization and MS allows the analysis of multiple food samples with simple or no sample treatment or in conjunction with prevailing sample preparation methods. Two ambient ionization methods, desorptive electrospray ionization (DESI) and direct analysis in real time (DART) have been adapted for food safety application. Both ionization techniques provide unique advantages and capabilities...
October 2, 2017: Journal of AOAC International
Joshua D Johnson, Nicholas M Desy, Rafael J Sierra
Osteochondral defects of the femoral head are rare. Several treatment options have been described, though there is currently no consensus on the appropriate management of these lesions. Five patients underwent femoral head osteochondral autograft transfer for treatment of ipsilateral femoral head osteochondral defects via surgical hip dislocation between 2011 and 2014 at our institution. The mean age of the patients was 24.8 (16-37) years. There were four females and one male. Mean follow-up was 53.8 (30-64) months...
August 2017: Journal of Hip Preservation Surgery
Gerald Klaassen, Dorien M Zelle, Gerjan J Navis, Desie Dijkema, Frederike J Bemelman, Stephan J L Bakker, Eva Corpeleijn
BACKGROUND: Low physical activity and reduced physical functioning are common after renal transplantation, resulting in a reduced quality of life. Another common post-transplantation complication is poor cardio-metabolic health, which plays a main role in long-term outcomes in renal transplant recipients (RTR). It is increasingly recognized that weight gain in the first year after transplantation, especially an increase in fat mass, is a highly common contributor to cardio-metabolic risk...
September 15, 2017: BMC Nephrology
Olivier Désy, Stéphanie Béland, Patrice Vallin, Julie Riopel, Eva Latulippe, Nader Najafian, Anil Chandraker, Mohsen Agharazii, Ibrahim Batal, Sacha A De Serres
Although borderline changes (BL) suspicious for acute T-cell-mediated rejection represent a diagnostic category, its clinical relevance is questioned leading to heterogeneous therapeutic management. We hypothesized that measuring IL-6 secretion by peripheral blood mononuclear cells identifies patients with ongoing graft damage. We examined the association between secreted IL-6 and the change in estimated glomerular filtration rate at 6 months after the biopsy (ΔeGFR). We then conducted phenotypic and functional studies on patient and mouse innate immune cells in the blood and the kidney...
September 14, 2017: Transplant International: Official Journal of the European Society for Organ Transplantation
Stephen Ambrose, Nicholas G Housden, Kallol Gupta, Jieyuan Fan, Paul White, Hsin-Yung Yen, Julien Marcoux, Colin Kleanthous, Jonathan T S Hopper, Carol V Robinson
Mass spectrometry (MS) applications for intact protein complexes typically require electrospray (ES) ionization and have not been achieved via direct desorption from surfaces. Desorption ES ionization (DESI) MS has however transformed the study of tissue surfaces through release and characterisation of small molecules. Motivated by the desire to screen for ligand binding to intact protein complexes we report the development of a native DESI platform. By establishing conditions that preserve non-covalent interactions we exploit the surface to capture a rapid turnover enzyme-substrate complex and to optimise detergents for membrane protein study...
September 8, 2017: Angewandte Chemie
Keaton S Nahan, Noe Alvarez, Vesselin Shanov, Anne Vonderheide
Mass spectrometry continues to tackle many complicated tasks, and ongoing research seeks to simplify its instrumentation as well as sampling. The desorption electrospray ionization (DESI) source was the first ambient ionization source to function without extensive gas requirements and chromatography. Electrospray techniques generally have low efficiency for ionization of nonpolar analytes and some researchers have resorted to methods such as direct analysis in real time (DART) or desorption atmospheric pressure chemical ionization (DAPCI) for their analysis...
November 2017: Journal of the American Society for Mass Spectrometry
Lucilia Kato, Aline Pereira Moraes, Cecília Maria Alves de Oliveira, Boniek Gontijo Vaz, Letícia de Almeida Gonçalves, Elienai Cândida E Silva, Christian Janfelt
INTRODUCTION: Species of the genera Psychotria and Palicourea are sources of indole alkaloids, however, the distribution of alkaloids within the plants is not known. Analysing the spatial distribution using desorption electrospray ionisation mass spectrometry imaging (DESI-MSI) has become attractive due to its simplicity and high selectivity compared to traditional histochemical techniques. OBJECTIVES: To apply DESI-MSI to visualise the alkaloid distribution on the leaf surface of Psychotria prunifolia and Palicourea coriacea and to compare the distributions with HPLC-MS and histochemical analyses...
September 6, 2017: Phytochemical Analysis: PCA
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