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https://www.readbyqxmd.com/read/29684940/evaluation-of-total-nitrite-pattern-visualization-as-an-improved-method-for-gunshot-residue-detection-and-its-application-to-casework-samples
#1
Jason Berger, Colin Upton, Elyah Springer
Visualization of nitrite residues is essential in gunshot distance determination. Current protocols for the detection of nitrites include, among other tests, the Modified Griess Test (MGT). This method is limited as nitrite residues are unstable in the environment and limited to partially burned gunpowder. Previous research demonstrated the ability of alkaline hydrolysis to convert nitrates to nitrites, allowing visualization of unburned gunpowder particles using the MGT. This is referred to as Total Nitrite Pattern Visualization (TNV)...
April 23, 2018: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/29684933/-dysphagia-from-a-gastroenterologist-s-perspective
#2
Marcus Hollenbach, Jürgen Feisthammel, Joachim Mössner, Albrecht Hoffmeister
Swallowing disorders (dysphagia) comprise a common cause of medical consultation and are defined as a subjective sensation of difficulty or abnormality of swallowing. In the initial step, a clear differentiation of dysphagia from odynophagia and globus sensation for further diagnostic procedures is mandatory. The careful questioning of patients symptoms and complaints is often helpful for the differentiation of oropharyngeal and esophageal dysphagia. Oropharyngeal dysphagia is mainly caused by neurological disorders (cerebral ischemia, Parkinson's disease, dementia) or local compression of malignancies, thyroid gland or lymph nodes...
May 2018: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/29684909/hyphenation-of-size-exclusion-chromatography-to-native-ion-mobility-mass-spectrometry-for-the-analytical-characterization-of-therapeutic-antibodies-and-related-products
#3
Anthony Ehkirch, Oscar Hernandez-Alba, Olivier Colas, Alain Beck, Davy Guillarme, Sarah Cianférani
Mass spectrometry performed in non-denaturing conditions (native MS), and its hyphenation to ion mobility spectrometry (IM-MS), have gained interest for the qualitative and quantitative characterization of intact monoclonal antibody-related (mAb) products. However, one main drawback is the manual sample preparation, which hampers its routine use in high throughput automated environments. Size exclusion chromatography (SEC) appears as an interesting technique to perform online buffer exchange in an automated way...
April 12, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29684907/efficiency-of-extraction-and-conversion-of-pseudoephedrine-to-methamphetamine-from-tamper-resistant-and-non-tamper-resistant-formulations
#4
Brandon Presley, Bob Bianchi, John Coleman, Fran Diamond, Gerry McNally
Clandestine chemists have demonstrated an ability to convert commercially available pseudoephedrine formulations to methamphetamine. Some of these formulations have properties that manufacturers claim limit or block the extraction of pseudoephedrine and its direct conversion to methamphetamine. In this study, 3 commercially available pseudoephedrine formulations were evaluated for ease of extraction and conversion to methamphetamine using a common chemistry technique called the one-pot method that is frequently employed by clandestine chemists...
April 16, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29684850/invasive-treatment-in-peripheral-artery-disease
#5
REVIEW
Spyridon G Deftereos, Dimitrios A Vrachatis, Christos Tolis, Georgios Giannopoulos
Invasive treatment in peripheral artery disease (PAD) has evolved as a viable alternative to surgical treatment. However, beyond the common pathophysiological substrate, as far as treatment is concerned, each site of atherosclerotic disease (subclavian and vertebral arteries; carotid arteries; intracranial arterial tree; renal arteries; lower extremity arteries) features unique characteristics. Treatment options include medical treatment, endovascular management and/or surgery. Sound clinical evaluation is required as individual patient assessment often limits intervention options, while available data regarding benefits of invasive and surgical management are questioned by advances in medical treatment...
April 20, 2018: Current Opinion in Pharmacology
https://www.readbyqxmd.com/read/29684832/effect-of-non-nutritive-sucking-and-sucrose-alone-and-in-combination-for-repeated-procedural-pain-in-preterm-infants-a-randomized-controlled-trial
#6
Haixia Gao, Mei Li, Honglian Gao, Guihua Xu, Fang Li, Jing Zhou, Yunsu Zou, Honghua Jiang
BACKGROUND: Sucrose combined with non-nutritive sucking provided better pain relief than sucrose or non-nutritive sucking alone in a single painful procedure. However, whether the combination of non-nutritive sucking with sucrose could obtain a significant difference in analgesic effect of the repeated procedural pain than any single intervention has not been established. OBJECTIVE: To compare the effect of non-nutritive sucking and sucrose alone and in combination of repeated procedural pain in preterm infants...
April 7, 2018: International Journal of Nursing Studies
https://www.readbyqxmd.com/read/29684774/hyperelastic-modeling-of-the-human-brain-tissue-effects-of-no-slip-boundary-condition-and-compressibility-on-the-uniaxial-deformation
#7
George Z Voyiadjis, Aref Samadi-Dooki
Being extremely soft, brain tissue is among the most challenging materials to be mechanically quantified. Despite recent advances in mechanical testing of ultra-soft matters, there still exists a need for robust procedures to analyze their behavior at large deformation. In this paper, it is shown how failing to taking into account the precise boundary conditions can result in substantial variation from the "assumed" ideal behavior, even for the case of simple loading conditions such as the uniaxial mode...
April 13, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29684749/aqueous-polythiophene-electrosynthesis-a-new-route-to-an-efficient-electrode-coupling-of-pqq-dependent-glucose-dehydrogenase-for-sensing-and-bioenergetic-applications
#8
Giovanni Fusco, Gero Göbel, Robertino Zanoni, Maria Paola Bracciale, Gabriele Favero, Franco Mazzei, Fred Lisdat
In this study, polythiophene copolymers have been used as modifier for electrode surfaces in order to allow the immobilization of active pyrroloquinoline quinone dependent glucose dehydrogenase (PQQ-GDH) and to simultaneously improve the direct electrical connection of the enzyme with the electrode. Polymer films are electrosynthesized in aqueous solution without the need of surfactants onto carbon nanotubes modified gold electrodes from mixtures of 3-thiopheneacetic acid (ThCH2 CO2 H) and 3-methoxythiophene (ThOCH3 ) using a potentiostatic pulse method...
April 7, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29684715/toward-an-accurate-determination-of-half-life-of-147-sm-isotope
#9
Odilon A P Tavares, Maria Letizia Terranova
The task of an accurate determination of alpha-decay rate of 147 Sm isotope, a topic of importance in both basic and applied science, has been performed in the present research following two different routes. First, a critical review and data analysis of the whole set of half-life values obtained till date yielded an average of 106.3 ± 0.5 Ga. Second, a one-parameter, semi-empirical model for alpha emission from nuclei, developed in the framework of quantum mechanical tunneling mechanism through a Coulomb-plus-centrifugal-plus-overlapping potential barrier, that yielded a value of 108...
April 6, 2018: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/29684571/cryoballoon-best-practices-ii-practical-guide-to-procedural-monitoring-and-dosing-during-atrial-fibrillation-ablation-from-the-perspective-of-experienced-users
#10
Wilber Su, Arash Aryana, Rod Passman, Gurjit Singh, Robert Hokanson, Marcin Kowalski, Jason Andrade, Paul Wang
Since cryoballoon was evaluated in STOP-AF, over 350,000 patients with AF have been treated. Several studies have reported improved outcomes using the second-generation cryoballoon, and recent publications have evaluated modifications, refinements, and improvements to procedural techniques. Here, peer-reviewed manuscripts published since the first cryoballoon best practices review were summarized against the technical practices of physicians with a high-level of experience with the cryoballoon (average ≥6 years of experience in ≥900 cases)...
April 20, 2018: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/29684563/long-term-results-of-prophylactic-donor-lymphocyte-infusions-for-patients-with-multiple-myeloma-after-allogeneic-stem-cell-transplantation
#11
Maximilian Gröger, Nico Gagelmann, Christine Wolschke, Ute-Marie von Pein, Evgeny Klyuchnikov, Max Christopeit, Axel Zander, Francis Ayuk, Nicolaus Kröger
OBJECTIVE: The major reason for treatment failure after allografting in multiple myeloma (MM) is relapse. Donor lymphocyte infusions are considered a valuable post-transplant strategy mainly for relapsed patients but using them to prevent relapse in MM has been reported rarely. In the present study we examined the efficacy of prophylactic donor lymphocyte infusions after allogeneic hematopoietic stem cell transplantation (allo-HSCT) in myeloma patients with a long-term follow-up of more than 5 years...
April 20, 2018: Biology of Blood and Marrow Transplantation
https://www.readbyqxmd.com/read/29684539/fewer-complications-after-uka-than-tka-in-patients-over-85-years-of-age-a-case-control-study
#12
Quentin Ode, Romain Gaillard, Cécile Batailler, Yannick Herry, Philippe Neyret, Elvire Servien, Sébastien Lustig
INTRODUCTION: Implanting a knee prosthesis in patients aged over 85 years is not without risk. Unicompartmental knee arthroplasty (UKA) is reputed to show lower morbidity and mortality than total knee arthroplasty (TKA). Elderly patients with isolated unicompartmental osteoarthritis without specific contraindications are thus good candidates for this procedure. The present retrospective case-control study compared complications rates in elderly patients receiving UKA versus TKA. The study hypothesis was that UKA incurs fewer complications, with equivalent functional results...
April 20, 2018: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/29684531/rapamycin-relieves-anxious-emotion-and-synaptic-plasticity-deficits-induced-by-hindlimb-unloading-in-mice
#13
Baohui Zhai, Xueliang Shang, Jingxuan Fu, Fangjuan Li, Tao Zhang
This study examined whether increasing autophagy could improve cognitive deficits in hindlimb unloaded (HU) mice, which was used as an animal model of synaptic plasticity impairment. Male C57BL/6 mice were randomly divided into three groups: control, HU and HU + rapamycin groups. Hindlimb unloading treatment was used to establish the animal model for 2 weeks. Rapamycin was intraperitoneally injected at a dose of 0.5 mg/kg/day along with hindlimb unloading procedure. The open field test and the elevated plus maze test showed that rapamycin considerably prevented the level of anxiety and increased exploratory behaviour in HU mice...
April 20, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29684518/long-term-outcomes-after-encephaloduroarteriosynangiosis-in-adult-patients-with-moyamoya-disease-presenting-with-ischemia
#14
Xiang-Yang Bao, Yong Zhang, Qian-Nan Wang, Qian Zhang, Hui-Wang, Zheng-Shan Zhang, De-Sheng Li, Lian Duan
BACKGROUND: In adult Moyamoya disease(MMD), there remains controversy about the effectiveness of revascularization surgeries because randomized studies have not been performed to compare the efficacy of surgical techniques. OBJECT: There is an ongoing controversy regarding the most appropriate surgical treatment for adult patients with MMD. METHODS: Encephaloduroarteriosynangiosis (EDAS) was performed on 247 hemispheres in 145 patients. The clinical and demographic characteristics of patients were obtained via retrospective chart review...
April 20, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29684514/an-analysis-of-radiation-effects-in-digital-subtraction-angiography-of-intracranial-artery-stenosis
#15
Chaoqun Guo, Xiaolei Shi, Xianhui Ding, Zhiming Zhou
BACKGROUND: Intracranial artery stenosis (IAS) is the most common cause for acute cerebral accidents. Digital subtraction angiography (DSA) is the gold standard to detect IAS, and usually brings excess radiation exposure to examinees and examiners. The artery pathology might influence the interventional procedure, causing a prolonged radiation effects. However, no studies are available on the association between IAS pathology and operational parameters. METHODS: A retrospective analysis was conducted on 93 patients with first-ever stroke/transient ischemic attack (TIA), who received DSA examination within 3 months from onset in this single center...
April 20, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29684513/adult-chiari-i-malformations-an-analysis-of-surgical-risk-factors-and-complications-using-an-international-database
#16
Abhiraj D Bhimani, Darian R Esfahani, Steven Denyer, Ryan G Chiu, David Rosenberg, Ashley L Barks, Gregory D Arnone, Ankit I Mehta
BACKGROUND: Chiari I malformations are common in adults, and a frequent procedure in neurosurgical practice. Despite a number of studies, to date there is no consensus about the indications or surgical technique for this common condition. Growing emphasis on value-based care has emphasized reduction of readmissions and reoperations, and is particularly relevant in Chiari, which has traditionally been associated with a high complication rate. OBJECTIVE: To provide a contemporary surgical profile of risk factors and complications for Chiari I malformations in adults...
April 20, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29684483/three-dimensional-protein-shape-similarity-analysis-based-on-hybrid-features
#17
Zhong Li, Jiangjiang Yu, Hailong Hu, Shuiwang Ji
The analysis of protein similarity is a matter of concern in the bioinformatics field, since studying the protein similarity can help understand the protein structure-function relationship. To this aim, several methods have been proposed, but currently, protein similarity results are still not satisfactory. Here we presented a novel method for evaluating the similarity of 3D protein models based on hybrid features, including the local diameter (LD), the salient geometric feature (SGF) and the heat kernel signature (HKS)...
April 20, 2018: Gene
https://www.readbyqxmd.com/read/29684469/imaging-techniques-to-study-drug-transporter-function-in-vivo
#18
REVIEW
Nicolas Tournier, Bruno Stieger, Oliver Langer
Transporter systems involved in the permeation of drugs and solutes across biological membranes are recognized as key determinants of pharmacokinetics. Typically, the action of membrane transporters on drug exposure to tissues in living organisms is inferred from invasive procedures, which cannot be applied in humans. In recent years, imaging methods have greatly progressed in terms of instruments, synthesis of novel imaging probes as well as tools for data analysis. Imaging allows pharmacokinetic parameters in different tissues and organs to be obtained in a non-invasive or minimally invasive way...
April 20, 2018: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/29684386/valuing-innovative-endoscopic-techniques-per-oral-endoscopic-myotomy-for-the-management-of-achalasia
#19
Eric D Shah, Andrew C Chang, Ryan Law
BACKGROUND AND AIMS: Unclear reimbursement for new and innovative endoscopic procedures can limit adoption in clinical practice despite effectiveness in clinical trials. The aim of this study was to determine maximum cost-effective reimbursement for per-oral endoscopic myotomy (POEM) in treating achalasia. METHODS: We constructed a decision analytic model assessing POEM versus laparoscopic Heller myotomy with Dor fundoplication (LHM) in managing achalasia from a payer perspective over a 1-year time horizon...
April 20, 2018: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/29684382/maternal-plasma-concentrations-of-macrophage-migration-inhibitory-factor-at-first-trimester-as-a-predictive-biomarker-of-preterm-delivery-in-chinese-women
#20
Hui Zhu, Mei-Jun Yang
BACKGROUND: Infection and/or inflammation have been proposed play role in the preterm delivery (PTD) pathogenesis. Macrophage migration inhibitory factor(MIF), a mediator of innate immunity and inflammation, is induced in various infections, including those that occur during pregnancy. We assessed the relation between maternal early pregnancy plasma concentrations of MIF and PTD. METHODS: Women were recruited before 14 weeks gestation and were followed up until delivery...
April 20, 2018: Clinica Chimica Acta; International Journal of Clinical Chemistry
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