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Portable monitoring

Xiu-Xiu Zhang, Yi-Zhen Song, Fang Fang, Zhi-Yong Wu
On-site rapid monitoring of nitrite as an assessment indicator of the environment, food, and physiological systems has drawn extensive attention. Here, electrokinetic stacking (ES) was combined with colorimetric reaction on a paper-based device (PAD) to achieve colorless nitrite detection with smartphone. In this paper, nitrite was stacked on the paper fluidic channel as a narrow band by electrokinetic stacking. Then, Griess reagent was introduced to visualize the stacking band. Under optimal conditions, the sensitivity of nitrite was 160-fold increased within 5 min...
March 19, 2018: Analytical and Bioanalytical Chemistry
Georgia-Paraskevi Nikoleli, Dimitrios P Nikolelis, Christina G Siontorou, Stephanos Karapetis, Theo Varzakas
The modern environmental and food analysis requires sensitive, accurate, and rapid methods. The growing field of biosensors represents an answer to this demand. Unfortunately, most biosensor systems have been tested only on distilled water or buffered solutions, although applications to real samples are increasingly appearing in recent years. In this context, biosensors for potential food applications continue to show advances in areas such as genetic modification of enzymes and microorganisms, improvement of recognition element immobilization, and sensor interfaces...
2018: Advances in Food and Nutrition Research
Masoud Ghader, Nader Shokoufi, Ali Es-Haghi, Kazem Kargosha
Vaccine production is a biological process in which variation in time and output is inevitable. Thus, the application of Process Analytical Technologies (PAT) will be important in this regard. Headspace solid - phase microextraction (HS-SPME) coupled with GC-MS can be used as a PAT for process monitoring. This method is suitable to chemical profiling of volatile organic compounds (VOCs) emitted from microorganisms. Tetanus is a lethal disease caused by Clostridium tetani (C. tetani) bacterium and vaccination is an ultimate way to prevent this disease...
February 6, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Selwyn Marc Prea, Yu Xiang George Kong, Aditi Mehta, Mingguang He, Jonathan G Crowston, Viney Gupta, Keith R Martin, Algis J Vingrys
PURPOSE: To establish the medium-term repeatability of the iPad perimetry app Melbourne Rapid Fields (MRF) compared to Humphrey Field Analyzer (HFA) 24-2 SITA-standard and SITA-fast programs. DESIGN: Multicentre longitudinal observational clinical study. PARTICIPANTS: 60 patients (stable glaucoma/ocular hypertension/glaucoma suspects) were recruited into a 6-month longitudinal clinical study with visits planned at baseline, 2-, 4- and 6-months...
March 14, 2018: American Journal of Ophthalmology
Clara Gregori-Pla, Gianluca Cotta, Igor Blanco, Peyman Zirak, Martina Giovannella, Anna Mola, Ana Fortuna, Turgut Durduran, Mercedes Mayos
MOTIVATION: Obstructive sleep apnea (OSA) can impair cerebral vasoreactivity and is associated with an increased risk of cerebrovascular disease. Unfortunately, an easy-to-use, non-invasive, portable monitor of cerebral vasoreactivity does not exist. Therefore, we have evaluated the use of near-infrared diffuse correlation spectroscopy to measure the microvascular cerebral blood flow (CBF) response to a mild head-of-bed position change as a biomarker for the evaluation of cerebral vasoreactivity alteration due to chronic OSA...
2018: PloS One
Mitchell R Dyer, DaShawn Hickman, Norman Luc, Shannon Haldeman, Patricia Loughran, Christa Pawlwoski, Anirban Sen Gupta, Matthew D Neal
BACKGROUND: Clinical resuscitative treatment of traumatic hemorrhage involves transfusion of RBC, platelets and plasma in controlled ratios. However, use of such blood components, especially platelets, present many challenges including availability, portability, contamination risks, and short shelf-life, which limit the use of platelet transfusions outside of large trauma centers such as remote civilian hospitals and austere pre-hospital settings. This has prompted significant research in platelet substitutes that may resolve the above issues while providing platelet-mimetic hemostatic action...
March 12, 2018: Journal of Trauma and Acute Care Surgery
Sheryl Magzamen, Assaf P Oron, Emily R Locke, Vincent S Fan
BACKGROUND: Studies have linked ambient air pollution to chronic obstructive pulmonary disease (COPD) healthcare encounters. However, the association between air quality and rescue medication use is unknown. OBJECTIVES: We assessed the role of air pollution exposure for increased short-acting beta-2-agonist (SABA) use in patients with COPD through use of remote monitoring technology. METHODS: Participants received a portable electronic inhaler sensor to record the date, time and location for SABA use over a 3-month period...
March 13, 2018: Occupational and Environmental Medicine
Ana R Bastos, Carlos M S Vicente, Rui Oliveira-Silva, Nuno J O Silva, Marta Tacão, João P da Costa, Mário Lima, Paulo S André, Rute A S Ferreira
The development of portable low-cost integrated optics-based biosensors for photonics-on-a-chip devices for real-time diagnosis are of great interest, offering significant advantages over current analytical methods. We report the fabrication and characterization of an optical sensor based on a Mach-Zehnder interferometer to monitor the growing concentration of bacteria in a liquid medium. The device pattern was imprinted on transparent self-patternable organic-inorganic di-ureasil hybrid films by direct UV-laser, reducing the complexity and cost production compared with lithographic techniques or three-dimensional (3D) patterning using femtosecond lasers...
March 12, 2018: Sensors
Emily S Patterson
Objective To integrate and synthesize insights from recent studies of workarounds to the intended use of health information technology (HIT) by health care professionals. Background Systems are safest when the documentation of how work is done in policies and procedures closely matches what people actually do when they are working. Proactively identifying and managing workarounds to the intended use of technology, including deviations from expected workflows, can improve system safety. Method A narrative review of studies of workarounds with HIT was conducted to identify themes in the literature...
March 1, 2018: Human Factors
Ewa Niechwiej-Szwedo, David Gonzalez, Mina Nouredanesh, James Tung
Kinematic analysis of upper limb reaching provides insight into the central nervous system control of movements. Until recently, kinematic examination of motor control has been limited to studies conducted in traditional research laboratories because motion capture equipment used for data collection is not easily portable and expensive. A recently developed markerless system, the Leap Motion Controller (LMC), is a portable and inexpensive tracking device that allows recording of 3D hand and finger position...
2018: PloS One
Hansol X Ryu, Sukyung Park
To enhance the wearability of portable motion-monitoring devices, the size and number of sensors are minimized, but at the expense of quality and quantity of data collected. For example, owing to the size and weight of low-frequency force transducers, most currently available wearable gait measurement systems provide only limited, if any, elements of ground reaction force (GRF) data. To obtain the most GRF information possible with a minimal use of sensors, we propose a GRF estimation method based on biomechanical knowledge of human walking...
February 9, 2018: Journal of Biomechanics
Habiba Kapaya, Richard Jacques, Dilly Anumba
OBJECTIVE: To assess the influence of gender, time of the day and gestational age on fetal heart rate (FHR) parameters between appropriate-for-gestational-age (AGA) and small-for-gestational age (SGA) fetuses using a portable fetal ECG monitor employed in the home setting. METHODS: We analysed and compared the antenatal FHR data collected in the home setting on 61 healthy pregnant women with singleton pregnancies from 24 weeks gestation. Of the 61 women, 31 had SGA fetuses (estimated fetal weight below the tenth gestational centile) and 30 were pregnant with AGA fetuses...
2018: PloS One
M Chavez, F Grosselin, A Bussalb, F De Vico Fallani, X Navarro-Sune
OBJECTIVE: the recent emergence and success of electroencephalography (EEG) in low-cost portable devices, has opened the door to a new generation of applications processing a small number of EEG channels for health monitoring and brain-computer interfacing. These recordings are, however, contaminated by many sources of noise degrading the signals of interest, thus compromising the interpretation of the underlying brain state. In this paper, we propose a new data-driven algorithm to effectively remove ocular and muscular artifacts from single-channel EEG: the surrogate-based artifact removal (SuBAR)...
March 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Gabrielle Wong-Parodi, M Beatrice Dias, Michael Taylor
BACKGROUND: Air quality affects us all and is a rapidly growing concern in the 21st century. We spend the majority of our lives indoors and can be exposed to a number of pollutants smaller than 2.5 microns (particulate matter, PM2.5 ) resulting in detrimental health effects. Indoor air quality sensors have the potential to provide people with the information they need to understand their risk and take steps to reduce their exposure. One such sensor is the Speck sensor developed at the Community Robotics, Education and Technology Empowerment Lab at Carnegie Mellon University...
March 8, 2018: JMIR MHealth and UHealth
Mathieu Odijk, Albert van den Berg
In this review, we summarize recent advances in nanoscale electrochemistry, including the use of nanoparticles, carbon nanomaterials, and nanowires. Exciting developments are reported for nanoscale redox cycling devices, which can chemically amplify signal readout. We also discuss promising high-frequency techniques such as nanocapacitive CMOS sensor arrays or heterodyning. In addition, we review electrochemical microreactors for use in (drug) synthesis, biocatalysis, water treatment, or to electrochemically degrade urea for use in a portable artificial kidney...
March 8, 2018: Annual Review of Analytical Chemistry
Zhen Zhen, Zechen Li, Xuanliang Zhao, Yujia Zhong, Li Zhang, Qiao Chen, Tingting Yang, Hongwei Zhu
Portable humidity sensors with ultrafast responses fabricated in wearable devices have promising application prospects in disease diagnostics, health status monitoring, and personal healthcare data collecting. However, prolonged exposures to high-humidity environments usually cause device degradation or failure due to excessive water adsorbed on the sensor surface. In the present work, a graphene film based humidity sensor with a hydrophobic surface and uniformly distributed ring-like wrinkles is designed and fabricated that exhibits excellent performance in breath sensing...
March 8, 2018: Small
V G C Ribeiro, V A Mendonça, A L C Souza, S F Fonseca, A C R Camargos, V K S Lage, C D C Neves, J M Santos, L A C Teixeira, E L M Vieira, A L Teixeira Junior, B Mezêncio, J S C Fernandes, H R Leite, J R Poortmans, A C R Lacerda
The aims of this study were 1) to characterize the intensity of the vibration stimulation in women diagnosed with fibromyalgia (FM) compared to a control group of healthy women (HW) matched by age and anthropometric parameters, and 2) to investigate the effect of a single session of whole body vibration (WBV) on inflammatory responses. Levels of adipokines, soluble tumor necrosis factor receptors (sTNFr1, sTNFr2), and brain-derived neurotrophic factor (BDNF) were determined by enzyme-linked immunosorbent assay...
March 1, 2018: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
Mohd Farhan Siddiqui, Soocheol Kim, Hyoil Jeon, Taeho Kim, Chulmin Joo, Seungkyung Park
Conventional methods for analyzing heavy metal contamination in soil and water generally require laboratory equipped instruments, complex procedures, skilled personnel and a significant amount of time. With the advancement in computing and multitasking performances, smartphone-based sensors potentially allow the transition of the laboratory-based analytical processes to field applicable, simple methods. In the present work, we demonstrate the novel miniaturized setup for simultaneous sample preparation and smartphone-based optical sensing of arsenic As(III) in the contaminated soil...
March 4, 2018: Sensors
Jesus A Leon-Gil, Agustin Cortes-Loredo, Angel Fabian-Mijangos, Javier J Martinez-Flores, Marco Tovar-Padilla, M Antonia Cardona-Castro, Alfredo Morales-Sánchez, Jaime Alvarez-Quintana
Internet of Things (IoT) is an emerging platform in which every day physical objects provided with unique identifiers are connected to the Internet without requiring human interaction. The possibilities of such a connected world enables new forms of automation to make our lives easier and safer. Evidently, in order to keep billions of these communicating devices powered long-term, a self-sustainable operation is a key point for realization of such a complex network. In this sense, energy-harvesting technologies combined with low power consumption ICs eliminate the need for batteries, removing an obstacle to the success of the IoT...
March 3, 2018: Sensors
Annemiek D Barsingerhorn, F Nienke Boonstra, Jeroen Goossens
Traditional video-based eyetrackers require participants to perform an individual calibration procedure, which involves the fixation of multiple points on a screen. However, certain participants (e.g., people with oculomotor and/or visual problems or infants) are unable to perform this task reliably. Previous work has shown that with two cameras one can estimate the orientation of the eyes' optical axis directly. Consequently, only one calibration point is needed to determine the deviation between an eye's optical and visual axes...
March 5, 2018: Behavior Research Methods
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