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https://www.readbyqxmd.com/read/29352237/wearable-sweat-rate-sensors-for-human-thermal-comfort-monitoring
#1
Jai Kyoung Sim, Sunghyun Yoon, Young-Ho Cho
We propose watch-type sweat rate sensors capable of automatic natural ventilation by integrating miniaturized thermo-pneumatic actuators, and experimentally verify their performances and applicability. Previous sensors using natural ventilation require manual ventilation process or high-power bulky thermo-pneumatic actuators to lift sweat rate detection chambers above skin for continuous measurement. The proposed watch-type sweat rate sensors reduce operation power by minimizing expansion fluid volume to 0...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29345538/real-time-monitoring-of-nanoscale-tio2-concentration-by-spectrophotometry-implications-of-agglomeration-due-to-natural-organic-matter-and-multivalent-ions
#2
Andrew B Holmes, Frank X Gu
The study of the environmental fate of nanoscale TiO2 (n-TiO2) is a major recent research focus which requires a rapid and accurate on-site concentration determination method. Inductively coupled plasma mass spectroscopy (ICP-MS) has been the most widely used method for determining the concentration of n-TiO2 in environmental samples; however, poses many challenges, such as hazardous hydrofluoric acid pre-treatment and clear limitations in mobile on-site measurement and monitoring. This study demonstrates that industrial wastewater containing natural organic matter (NOM) can present a major challenge to the analysis of n-TiO2 by ICP-MS, and introduces a spectrophotometry technique that can be used as an alternative...
January 18, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29342953/review-of-recent-metamaterial-microfluidic-sensors
#3
REVIEW
Ahmed Salim, Sungjoon Lim
Metamaterial elements/arrays exhibit a sensitive response to fluids yet with a small footprint, therefore, they have been an attractive choice to realize various sensing devices when integrated with microfluidic technology. Micro-channels made from inexpensive biocompatible materials avoid any contamination from environment and require only microliter-nanoliter sample for sensing. Simple design, easy fabrication process, light weight prototype, and instant measurements are advantages as compared to conventional (optical, electrochemical and biological) sensing systems...
January 15, 2018: Sensors
https://www.readbyqxmd.com/read/29341206/validation-of-a-portable-monitor-for-assessment-of-cerebrospinal-fluid-lactate-in-dogs
#4
Carolyn J Nye, Christopher L Mariani
BACKGROUND: Cerebrospinal fluid (CSF) lactate concentration may be a useful diagnostic and prognostic biomarker in dogs. Previous studies have used methods requiring relatively large sample volumes or prolonged storage prior to analysis. An effective method to immediately quantify lactate in smaller CSF volumes would be beneficial. OBJECTIVES: The main objectives were to evaluate the utility, accuracy, and precision of a portable meter for CSF lactate analysis in dogs and to develop a provisional RI using this device...
January 17, 2018: Veterinary Clinical Pathology
https://www.readbyqxmd.com/read/29339568/bone-surface-enhancement-in-ultrasound-images-using-a-new-doppler-based-acquisition-processing-method
#5
Xu Yang, Songyuan Tang, Ennio Tasciotti, Raffaella Righetti
Ultrasound (US) imaging has long been considered as a potential aid in orthopedic surgeries. US technologies are safe, portable and do not use radiations. This would make them a desirable tool for real-time assessment of fractures and to monitor fracture healing. However, image quality of US imaging methods in bone applications is limited by speckle, attenuation, shadow, multiple reflections and other imaging artifacts. While bone surfaces typically appear in US images as somewhat 'brighter' than soft tissue, they are often not easily distinguishable from the surrounding tissue...
January 17, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29334390/smartphone-integrated-optoelectrowetting-sioew-for-on-chip-sample-processing-and-microscopic-detection-of-water-quality
#6
Dongyue Jiang, Seunguk Lee, Sung Woo Bae, Sung-Yong Park
With the increasing capabilities and ubiquity of smartphones and their associated digital cameras, this study presents a smartphone integrated optoelectrowetting (SiOEW) device as a simple, portable tool capable of on-chip water sample preparation and microscopic detection of the target cells in water samples, which significantly reduce the detection time and the labor cost required for water quality monitoring. A commercially available smartphone is used as a low-intensity portable light source to perform optoelectrowetting (OEW)-based microfluidic operations such as droplet transportation, merging, mixing, and immobilization on a hydrophobic detection zone...
January 15, 2018: Lab on a Chip
https://www.readbyqxmd.com/read/29333991/evaluation-of-a-portable-gas-chromatograph-with-photoionization-detector-under-variations-of-voc-concentration-temperature-and-relative-humidity
#7
Jhy-Charm Soo, Eun Gyung Lee, Ryan F LeBouf, Michael L Kashon, William Chisholm, Martin Harper
The objective of this present study was to evaluate the performance of a portable gas chromatograph ─ photoionization detector (GC-PID), under various test conditions to determine if it could be used in occupational settings. A mixture of seven volatile organic compounds (VOCs) - acetone, ethylbenzene, methyl isobutyl ketone, toluene, m-xylene, p-xylene, and o-xylene - was selected because its components are commonly present in paint manufacturing industries. A full-factorial combination of four concentration levels (exposure scenarios) of VOC mixtures, three different temperatures (25˚C, 30˚C, and 35˚C), and three relative humidities (RHs; 25%, 50%, and 75%) was conducted in a full- size controlled environmental chamber...
January 15, 2018: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29333859/chromatographic-separation-and-visual-detection-on-wicking-microfluidic-devices-quantitation-of-cu2-in-surface-ground-and-drinking-water
#8
Gayan C Bandara, Christopher Heist, Vincent T Remcho
Copper is widely applied in industrial and technological applications, and is an essential micro nutrient for humans and animals. However, exposure to high environmental levels of copper, especially through drinking water, can lead to copper toxicity, resulting in severe acute and chronic health effects. Therefore, regular monitoring of aqueous copper ions has become necessary as recent anthropogenic activities have led to elevated environmental concentrations of copper. On-site monitoring processes require an inexpensive, simple, and portable analytical approach capable of generating reliable qualitative and quantitative data efficiently...
January 15, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29324692/a-portable-dynamic-laser-speckle-system-for-sensing-long-term-changes-caused-by-treatments-in-painting-conservation
#9
Alberto J Pérez, Rolando J González-Peña, Roberto Braga, Ángel Perles, Eva Pérez-Marín, Fernando J García-Diego
Dynamic laser speckle (DLS) is used as a reliable sensor of activity for all types of materials. Traditional applications are based on high-rate captures (usually greater than 10 frames-per-second, fps). Even for drying processes in conservation treatments, where there is a high level of activity in the first moments after the application and slower activity after some minutes or hours, the process is based on the acquisition of images at a time rate that is the same in moments of high and low activity. In this work, we present an alternative approach to track the drying process of protective layers and other painting conservation processes that take a long time to reduce their levels of activity...
January 11, 2018: Sensors
https://www.readbyqxmd.com/read/29322547/improvement-of-the-salvage-rate-of-flap-after-venous-thrombosis-with-intraparenchymatous-venous-pressure-monitoring
#10
Hajime Matsumine, Mariko Mogami, Osamu Fujiwara, Masahiro Hasegawa, Hiroshi Ito, Hiroyuki Sakurai
PURPOSE: Intraparenchymatous venous pressure (IVP) monitoring in flap can measure venous pressure with catheter placement. Among patients with IVP monitoring, this study reviewed postoperative microvascular complications for investigating the transplanted-tissue salvage-rate. PATIENTS AND METHODS: Two hundred and seventy-one patients (male, 132; female, 139; mean age, 52.3 years; age range, 9-82 years) underwent free flap transfer and postoperative continuous IVP monitoring, which performed as follows; a venous catheter was connected to a transducer, and venous pressure in the flap was recorded for three consecutive days postoperatively...
January 11, 2018: Microsurgery
https://www.readbyqxmd.com/read/29321453/nanomaterial-functionalized-cellulose-design-characterization-and-analytical-applications
#11
Kevin A Kirk, Ali Othman, Silvana Andreescu
Cellulose-nanomaterial hybrid systems are promising platforms for the development of portable devices that can be used for fast and inexpensive analysis in the clinical, environmental and food monitoring fields. By combining the chemical and physical properties of the cellulosic network with the unique optical, electrical and catalytic functions of nanomaterials, it is possible to create versatile devices with engineered sensing functions. This review describes the most commonly used types of nanomaterials, their unique properties and assembly in hybrid structures in conjunction with cellulose paper and provides an overview of the most commonly used detection methodologies and their performance for selected applications...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29318567/phenotyping-the-pathophysiology-of-obstructive-sleep-apnea-using-polygraphy-polysomnography-a-review-of-the-literature
#12
REVIEW
Marcello Bosi, Andrea De Vito, Bhik Kotecha, Luca Viglietta, Alberto Braghiroli, Joerg Steier, Martino Pengo, Giovanni Sorrenti, Riccardo Gobbi, Claudio Vicini, Venerino Poletti
Continuous positive airway pressure (CPAP) is the first-line treatment for the majority of patients affected by obstructive sleep apnea syndrome (OSA). However, long-term compliance with CPAP therapy may result limited and alternatives to CPAP therapy are required to address the increasing need to provide tailored therapeutic options. Understanding the pathophysiological traits (PTs) of OSA patients [upper airway (UA) anatomical collapsibility, loop gain (LG), arousal threshold (AT), and UA gain (UAG)] lies at the heart of the customized OSA treatment...
January 9, 2018: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/29318566/diagnostic-accuracy-of-level-iv-portable-sleep-monitors-versus-polysomnography-for-obstructive-sleep-apnea-a-systematic-review-and-meta-analysis
#13
REVIEW
Lusine Abrahamyan, Yeva Sahakyan, Suzanne Chung, Petros Pechlivanoglou, Joanna Bielecki, Steven M Carcone, Valeria E Rac, Michael Fitzpatrick, Murray Krahn
PURPOSE: Obstructive sleep apnea (OSA) is the most common sleep-related breathing disorder. In-laboratory, overnight type I polysomnography (PSG) is the current "gold standard" for diagnosing OSA. Home sleep apnea testing (HSAT) using portable monitors (PMs) is an alternative testing method offering better comfort and lower costs. We aimed to systematically review the evidence on diagnostic ability of type IV PMs compared to PSG in diagnosing OSA. METHODS: Participants: patients ≥16 years old with symptoms suggestive of OSA;intervention: type IV PMs (devices with < 2 respiratory channels); comparator: in-laboratory PSG; outcomes: diagnostic accuracy measures;studies: cross-sectional, prospective observational/experimental/quasi-experimental studies; information sources: MEDLINE and Cochrane Library from January 1, 2010 to May 10, 2016...
January 9, 2018: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/29310223/portable-vibration-assisted-filtration-device-for-on-site-isolation-of-blood-cells-or-pathogenic-bacteria-from-whole-human-blood
#14
Yong Tae Kim, Kyun Joo Park, Seyl Kim, Soon Ae Kim, Seok Jae Lee, Do Hyun Kim, Tae Jae Lee, Kyoung G Lee
Isolation of specific cells from whole blood is important to monitor disease prognosis and diagnosis. In this study, a vibration-assisted filtration (VF) device has been developed for isolation and recovery of specific cells such as leukocytes and pathogenic bacteria from human whole blood. The VF device is composed of three layers which was fabricated using injection molding with cyclic olefin copolymer (COC) pellets consisting of: a top layer with coin-type vibration motor (Ф = 10mm), a middle plate with a 1μm or 3μm-pore filter membrane to separate of Staphylococcus aureus (S...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29306031/simultaneous-detection-of-dual-biomarkers-from-humans-exposed-to-organophosphorus-pesticides-by-combination-of-immunochromatographic-test-strip-and-ellman-assay
#15
Mingming Yang, Yuting Zhao, Limin Wang, Michael Paulsen, Christopher D Simpson, Fengquan Liu, Dan Du, Yuehe Lin
A novel sandwich immunoassay based immunochromatographic test strip (ICTS) has been developed for simultaneously measuring both butyrylcholinesterase (BChE) activity and the total amount of BChE (including inhibited and active enzyme) from 70 μLpost-exposure human plasma sample. The principle of this method is based on the BChE monoclonal antibody (MAb) capable of acting as both capture antibody and detection antibody. The BChE MAb which was immobilized on the test line was able to recognize both organophosphorus BChE adducts (OP-BChE) and BChE and provided equal binding affinity, permitting detection of the total enzyme amount in post-exposure human plasma samples...
December 21, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29304041/development-of-a-biosensor-protein-bullet-as-a-fluorescent-method-for-fast-detection-of-escherichia-coli-in-drinking-water
#16
Ignacio Gutiérrez-Del-Río, Laura Marín, Javier Fernández, María Álvarez San Millán, Francisco Javier Ferrero, Marta Valledor, Juan Carlos Campo, Natalia Cobián, Ignacio Méndez, Felipe Lombó
Drinking water can be exposed to different biological contaminants from the source, through the pipelines, until reaching the final consumer or industry. Some of these are pathogenic bacteria and viruses which may cause important gastrointestinal or systemic diseases. The microbiological quality of drinking water relies mainly in monitoring three indicator bacteria of faecal origin, Escherichia coli, Enterococcus faecalis and Clostridium perfringens, which serve as early sentinels of potential health hazards for the population...
2018: PloS One
https://www.readbyqxmd.com/read/29300085/energetically-autonomous-wearable-and-multifunctional-sensor
#17
Hsing-Hua Hsieh, Fang-Chi Hsu, Yang-Fang Chen
Self-powered tactile sensing is the upcoming technological orientation for developing compact, robust, and energy-saving devices in human-machine interfacing and electronic skin. Here, we report an intriguing type of sensing device composed of a Pt crack-based sensor in series with a polymer solar cell as a building block for energetically autonomous, wearable, and tactile sensor. This coplanar device enables human activity and physiological monitoring under indoor light illumination (2 mW/cm2) with acceptable and readible output signals...
January 4, 2018: ACS Sensors
https://www.readbyqxmd.com/read/29299579/buffer-free-integrative-nanofluidic-device-for-real-time-continuous-flow-bioassays-by-ion-concentration-polarization
#18
Dinh-Tuan Phan, Lin Jin, Shofarul Wustoni, Chia-Hung Chen
To perform precision medicine in real-time, a sensor capable of continuously monitoring target biomolecules secreted from a patient under dynamic situations is essential. In this study, a novel portable device combining an aptamer probe and a nanofluidic component was developed, enabling the buffer-free continuous monitoring of small molecules in biological fluids. This integration is synergistic: the aptamer sensor is used to bind target biomolecules, triggering a fluorescence signal change, while the nanofluidic component is applied to achieve ion concentration polarization and convert serum into a clean buffer for aptamer signal regeneration...
January 4, 2018: Lab on a Chip
https://www.readbyqxmd.com/read/29296478/pencil-like-imaging-spectrometer-for-bio-samples-sensing
#19
Fuhong Cai, Dan Wang, Min Zhu, Sailing He
Spectrally-resolved imaging techniques are becoming central to the investigation of bio-samples. In this paper, we demonstrate the use of a WIFI-camera as a detection module to assemble a pencil-like imaging spectrometer, which weighs only 140 g and has a size of 3.1 cm in diameter and 15.5 cm in length. The spectrometer is standalone, and works wirelessly. A smartphone or network computer can serve as the data receiver and processor. The wavelength resolution of the spectrometer is about 17 nm, providing repeatable measurements of spatial two-dimensional images at various wavelengths for various bio-samples, including bananas, meat, and human hands...
December 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/29291593/mobile-phone-based-elisa-melisa
#20
Arsenii Zhdanov, Jordan Keefe, Luis Franco-Waite, Karthik Raj Konnaiyan, Anna Pyayt
Enzyme-linked immunosorbent assay (ELISA) is one of the most important technologies for biochemical analysis critical for diagnosis and monitoring of many diseases. Traditional systems for ELISA incubation and reading are expensive and bulky, thus cannot be used at point-of-care or in the field. Here, we propose and demonstrate a new miniature mobile phone based system for ELISA (MELISA). This system can be used to complete all steps of the assay, including incubation and reading. It weighs just 1 pound, can be fabricated at low cost, portable, and can transfer test results via mobile phone...
April 30, 2018: Biosensors & Bioelectronics
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