Graphite sheet as a novel material for the collection and electrochemical sensing of explosive residues.

Graphite sheet as a novel material for the collection and electrochemical sensing of explosive residues. Talanta. 2019 Oct 01;203:106-111 Authors: Castro SVF, Cardoso RM, Santana MHP, Richter EM, Munoz RAA Abstract This work presents the use of a graphite sheet (graphite papers) as a new platform for the collection and sensing of explosive residues. This material offers a lightweight, highly conductive, flexible platform that can be cut in several ways, enabling for the collection of explosive residues at the place of interest, without any further sample preparation steps. As a proof-of-concept, the device was utilised for the collection and electrochemical sensing of 2,4,6-trinitrotoluene (TNT) residues. The GS has a remarkable performance for the sensing of TNT within the supporting electrolyte (0.1 mol dm-3 HCl) resulting in a linear range between 1 and 1300 μmol dm-3 and detection limit of 0.06 μmol dm-3 using square-wave voltammetry (SWV). Five surfaces (granite, gloved and bare hands, metal and cash banknotes) were contaminated with traces of TNT and the collection was performed using the graphite sheet (1 cm2 square pieces were swiped over the different surfaces). The results obtained using SWV enabled the identification of TNT residues, at quantities of 0.01-0.23 ng (quantification by the measured coulometric charge of the SWV scan), demonstrating that this novel material can be used as a promising device at crime scene inve...
Source: Talanta - Category: Chemistry Authors: Tags: Talanta Source Type: research

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We thank the authors of this editorial for their very thoughtful comments. They are correct that the use of low dose CT (LDCT) scan can significantly reduce the radiation dose associated with kidney stone management. The sensitivity of LDCT for nephrolithiasis is well-established and comparable to that of standard dose CT scan (SDCT), especially in nonobese patients.1 Unfortunately, while the technology is available, limited evidence exists that widespread adoption of LDCT has occurred, especially in the emergency department setting where a significant percentage of imaging for nephrolithiasis is performed.
Source: Urology - Category: Urology & Nephrology Authors: Source Type: research
ConclusionSemi-dynamic MRI is an technique that is easy to perform to identify injuries of the A3 pulley ligament that were not seen on standard imaging.
Source: Skeletal Radiology - Category: Radiology Source Type: research
Conclusion We recommend suture for hemostasis during laparoscopic cystectomy.Resumo Objetivo O objetivo desta revis ão foi comparar o impacto dos diferentes métodos hemostáticos na reserva ovariana durante a ooforoplastia laparoscópica. Fontes de Dados Os estudos foram identificados através da pesquisa de bases de dados eletrônicas (MEDLINE, Embase, Cochrane, LILACS) e listas de referência de artigos. S eleção dos estudos Selecionamos ensaios clínicos que avaliaram a influência das técnicas hemostáticas na reserva ovariana em pacientes ...
Source: Revista Brasileira de Ginecologia e Obstetricia - Category: OBGYN Source Type: research
A collaboration between Viz.ai and Medtronic could lead to better outcomes for stroke patients. Through the distribution agreement, San Francisco, CA-based Viz.ai would increase the reach of its artificial intelligence solution for stroke. Viz.ai’s solution identifies suspected large vessel occlusion (LVO) strokes and automatically notify specialists. It could lead patients to get treatment by technologies like Dublin-based Medtronic’s Solitaire revascularization device. “By combining AI software with therapy that works, that’s how we can truly improve...
Source: MDDI - Category: Medical Devices Authors: Tags: Business Software Source Type: news
CONCLUSION This case demonstrates that, similarly to Graves ’ disease, Hashitoxicosis can also be triggered by stressful life events.RESUMO OBJETIVO Mesmo que o estresse seja conhecido h á muito tempo como um fator provocativo para a doença de Graves, sua relação com a tireoidite de Hashimoto é mais controversa. Estudos sobre esse tema são escassos. O objetivo deste artigo é relatar um caso de Hashitoxicose induzida por estresse. RESULTADOS Aqui nós relatamos um caso de Has hitoxicose induzido por um evento psicológico estressante em uma mulher de 28 anos...
Source: Revista da Associacao Medica Brasileira - Category: General Medicine Source Type: research
Conclusions: This first replication study on multiple genes in independent Chinese population did not replicate any risk polymorphisms for LA other than rs 699 in AGT but revealed the significantly negative associations of PMF1, ICAM1, TRIM65, FBF1 and ACOX1 polymorphisms with LA. It not only supported the strong ethnic differences in the genetics of LA but also indicated that those 6 identified genes may be involved in Chinese white matter lesions.
Source: Frontiers in Genetics - Category: Genetics & Stem Cells Source Type: research
In this study, morphological features, dielectric properties, and microwave absorbing performances of thermoplastic polyurethane composite sheets prepared with solution mixing method by using different amounts and types of carbon fillers, carbon black (CB), graphite (G), carbon nanofiber (CNF), and multiwalled carbon nanotube (MWCNT) were investigated, in detail. Microstructural properties and microwave absorbing characteristics of composites were analyzed with scanning electron microscope and vector network analyzer by transmission line method, respectively. Reflection loss (RL) analyses of composites showed that CNF and ...
Source: Polymer - Category: Chemistry Source Type: research
AbstractAs the worldwide population ages, the prevalence of Alzheimer's disease (AD) increases. However, the results of promising medications have been unsatisfactory. Chinese acupuncture has a long history of treating dementia, but lack of evidence from well-designed randomized controlled trials that validate its efficacy and safety, as well as its lack of clear underlying mechanisms, contribute to its limited application in clinical practice. In recent years, brain imaging technologies, such as functional magnetic resonance imaging and positron emission tomography, have been used to assess brain responses to acupuncture ...
Source: Chinese Journal of Integrative Medicine - Category: Internal Medicine Source Type: research
The need for surveillance and optimal management of recurrent stenosis after carotid endarterectomy (CEA) or carotid artery stenting (CAS) and whether carotid restenosis is associated with an increased risk of recurrent ipsilateral stroke are controversial.1-3 The recently reported Society for Vascular Surgery (SVS) practice guidelines on follow-up after vascular surgery arterial procedures recommend surveillance with Duplex ultrasonography (DUS) after CEA and CAS at baseline, every 6  months for 2 years, and annually thereafter until stable (ie, until no restenosis or in-stent restenosis [ISR] has been observed ...
Source: Journal of Vascular Surgery - Category: Surgery Authors: Tags: Editorial Source Type: research
A retrospective single center review was performed at the Massachusetts General Hospital between 2012 and 2017.
Source: Journal of Vascular Surgery - Category: Surgery Authors: Tags: Spontaneous retroperitoneal and rectus sheath hematomas —treat only when intravenous contrast material extravasation is visualized on computed tomography scan Source Type: research
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