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https://www.readbyqxmd.com/read/28627748/on-line-reaction-monitoring-by-mass-spectrometry-modern-approaches-for-the-analysis-of-chemical-reactions
#1
REVIEW
Andrew Ray, Tony Bristow, Chris Whitmore, Jackie Mosely
The application of on-line mass spectrometry for direct analysis of chemical and other types of process continues to grow in importance and impact. The ability of the technique to characterize many aspects of a chemical reaction such as product and impurity formation, along with reactant consumption in a single experiment is key to its adoption and development. Innovations in ionization techniques and mass spectrometry instrumentation are enabling this adoption. An increasing range of ambient ionization techniques make on-line mass spectrometry applicable to a large range of chemistries...
June 19, 2017: Mass Spectrometry Reviews
https://www.readbyqxmd.com/read/28627135/in-situ-electrochemistry-of-rechargeable-battery-materials-status-report-and-perspectives
#2
REVIEW
Yijun Yang, Xizheng Liu, Zhonghua Dai, Fangli Yuan, Yoshio Bando, Dmitri Golberg, Xi Wang
The development of rechargeable batteries with high performance is considered to be a feasible way to satisfy the increasing needs of electric vehicles and portable devices. It is of vital importance to design electrodes with high electrochemical performance and to understand the nature of the electrode/electrolyte interfaces during battery operation, which allows a direct observation of the complicated chemical and physical processes within the electrodes and electrolyte, and thus provides real-time information for further design and optimization of the battery performance...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28626393/a-ssvep-stimuli-encoding-method-using-trinary-frequency-shift-keying-encoded-ssvep-tfsk-ssvep
#3
Xing Zhao, Dechun Zhao, Xia Wang, Xiaorong Hou
SSVEP is a kind of BCI technology with advantage of high information transfer rate. However, due to its nature, frequencies could be used as stimuli are scarce. To solve such problem, a stimuli encoding method which encodes SSVEP signal using Frequency Shift-Keying (FSK) method is developed. In this method, each stimulus is controlled by a FSK signal which contains three different frequencies that represent "Bit 0," "Bit 1" and "Bit 2" respectively. Different to common BFSK in digital communication, "Bit 0" and "Bit 1" composited the unique identifier of stimuli in binary bit stream form, while "Bit 2" indicates the ending of a stimuli encoding...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28625247/-a-design-and-study-of-a-novel-electronic-device-for-cuff-pressure-monitoring
#4
Shupeng Wang, Wei Li, Wen Li, Dejing Song, Desheng Chen, Jun Duan, Chen Li, Gang Li
OBJECTIVE: To design a novel electronic device for measuring the pressure in the cuff of the artificial airway; and to study the advantage of this device on continuous and intermittent cuff pressure monitoring. METHODS: (1) a portable electronic device for cuff pressure measurement was invented, which could turn pressure signal into electrical signal through a pressure transducer. Meantime, it was possible to avoid pressure leak from the joint and the inside of the apparatus by modified Luer taper and sophisticated design...
June 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28624618/a-sample-to-answer-real-time-convective-polymerase-chain-reaction-system-for-point-of-care-diagnostics
#5
Bowen Shu, Chunsun Zhang, Da Xing
Timely and accurate molecular diagnostics at the point-of-care (POC) level is critical to global health. To this end, we propose a handheld convective-flow real-time polymerase chain reaction (PCR) system capable of direct sample-to-answer genetic analysis for the first time. Such a system mainly consists of a magnetic bead-assisted photothermolysis sample preparation, a closed-loop convective PCR reactor, and a wireless video camera-based real-time fluorescence detection. The sample preparation exploits the dual functionality of vancomycin-modified magnetic beads (VMBs) for bacteria enrichment and photothermal conversion, enabling cell pre-concentration and lysis to be finished in less than 3min...
June 8, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28619662/rapid-detection-of-salmonella-with-recombinase-aided-amplification
#6
Xiaoping Zhang, Lichuan Guo, Ranran Ma, Lijuan Cong, Zhonghua Wu, Ying Wei, Shijie Xue, Wei Zheng, Saijun Tang
Rapid Salmonella detection using Recombinase Aided Amplification was established. The reaction completes in 20 min at 39°C and can be performed with a portable device. Once further improved, this method should be a great choice for monitoring contamination, such as foodborne Salmonella or for similar purposes.
June 12, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28618366/eu-3-functionalized-sc-mofs-turn-on-fluorescent-switch-for-ppb-level-biomarker-of-plastic-pollutant-polystyrene-in-serum-and-urine-and-on-site-detection-by-smartphone
#7
Xiao Lian, Tifang Miao, Xiaoyu Xu, Chi Zhang, Bing Yan
The harm of plastic pollutants for human and environment is being paid more and more attention. Polystyrene (PS) and styrene are toxic compounds used in large quantities in the production of fiberglass reinforced polyesters. In this work, a simple method was designed for independent detecting polystyrene and styrene biomarker (phenylglyoxylic acid, PGA) in serum and urine. We prepared Eu3+ functionalized Sc-based metal-organic frameworks as turn-on fluorescent switch for PGA. The distinct enhanced luminescence is observed from the Eu@MOFs with addition of PGA...
June 10, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28616366/increased-energy-cost-of-mobility-in-chronic-stroke
#8
Monica C Serra, Margarita S Treuth, Charlene E Hafer-Macko, Alice S Ryan
The purpose of this study was to compare the energy cost of completing mobility-related activities in chronic stroke to the estimated energy cost found in the compendium of physical activities, a resource that estimates and classifies energy cost of various human physical activities. Men (n=18) and women (n=10) with chronic hemiparetic gait (stroke latency: 4 ± 2 years, age: 60.4 ± 1.6 years, BMI: 31.5 ± 1.1 kg/m(2)) participated in the study. Portable energy cost monitoring (COSMED K4b2) was performed during five mobility activities of varying intensity to determine metabolic equivalents (METs, or oxygen consumption in multiples of resting level) for each activity...
December 2016: Journal of Gerontology & Geriatric Research
https://www.readbyqxmd.com/read/28613296/battery-operated-preconcentration-assisted-lateral-flow-assay
#9
Cheonjung Kim, Yong Kyoung Yoo, Sung Il Han, Junwoo Lee, Dohwan Lee, Kyungjae Lee, Kyo Seon Hwang, Kyu Hyoung Lee, Seok Chung, Jeong Hoon Lee
Paper-based analytical devices (e.g. lateral flow assays) are highly advantageous as portable diagnostic systems owing to their low costs and ease of use. Because of their low sensitivity and detection limits for biomolecules, these devices have several limitations in applications for real-field diagnosis. Here, we demonstrate a paper-based preconcentration enhanced lateral flow assay using a commercial β-hCG-based test. Utilizing a simple 9 V battery operation with a low power consumption of approximately 81 μW, we acquire a 25-fold preconcentration factor, demonstrating a clear sensitivity enhancement in the colorimetric lateral flow assay; consequently, clear colors are observed in a rapid kit test line, which cannot be monitored without preconcentration...
June 14, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28602754/detection-and-quantification-of-the-toxic-microalgae-karenia-brevis-using-lab-on-a-chip-mrna-sequence-based-amplification
#10
Christos-Moritz Loukas, Jonathan S McQuillan, Florian Laouenan, Maria-Nefeli Tsaloglou, Jesus M Ruano-Lopez, Matthew C Mowlem
Now and again, the rapid proliferation of certain species of phytoplankton can give rise to Harmful Algal Blooms, which pose a serious threat to marine life and human health. Current methods of monitoring phytoplankton are limited by poor specificity or by the requirement to return samples to a highly resourced, centralised lab. The Lab Card is a small, microfluidic cassette which, when used in tandem with a portable Lab Card Reader can be used to sensitively and specifically quantify harmful algae in the field, from nucleic acid extracts using RNA amplification; a sensitive and specific method for the enumeration of potentially any species based on their unique genetic signatures...
June 8, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28596545/rapid-on-site-monitoring-of-legionella-pneumophila-in-cooling-tower-water-using-a-portable-microfluidic-system
#11
Nobuyasu Yamaguchi, Yusuke Tokunaga, Satoko Goto, Yudai Fujii, Fumiya Banno, Akiko Edagawa
Legionnaires' disease, predominantly caused by the bacterium Legionella pneumophila, has increased in prevalence worldwide. The most common mode of transmission of Legionella is inhalation of contaminated aerosols, such as those generated by cooling towers. Simple, rapid and accurate methods to enumerate L. pneumophila are required to prevent the spread of this organism. Here, we applied a microfluidic device for on-chip fluorescent staining and semi-automated counting of L. pneumophila in cooling tower water...
June 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28595604/functionality-and-acceptability-of-a-wireless-fetal-heart-rate-monitoring-device-in-term-pregnant-women-in-rural-southwestern-uganda
#12
Godfrey R Mugyenyi, Esther C Atukunda, Joseph Ngonzi, Adeline Boatin, Blair J Wylie, Jessica E Haberer
BACKGROUND: Over 3 million stillbirths occur annually in sub Saharan Africa; most occur intrapartum and are largely preventable. The standard of care for fetal heart rate (FHR) assessment in most sub-Saharan African settings is a Pinard Stethoscope, limiting observation to one person, at one point in time. We aimed to test the functionality and acceptability of a wireless FHR monitor that could allow for expanded monitoring capacity in rural Southwestern Uganda. METHODS: In a mixed method prospective study, we enrolled 1) non-laboring healthy term pregnant women to wear the device for 30 min and 2) non-study clinicians to observe its use...
June 8, 2017: BMC Pregnancy and Childbirth
https://www.readbyqxmd.com/read/28582852/human-anti-lipopolysaccharid-lps-antibodies-against-legionella-with-high-species-specificity
#13
Philipp Kuhn, Stefanie Thiem, Michael Steinert, Duncan Purvis, Veronika Lugmayr, Ulrich Treutlein, Lutz Plobner, Robert-Matthias Leiser, Michael Hust, Stefan Dübel
Legionella are Gram-negative bacteria that are ubiquitously present in natural and man-made water reservoirs. When humans inhale aerosolized water contaminated with Legionella, alveolar macrophages can be infected, which may lead to a life-threatening pneumonia called Legionnaires' disease. Due to the universal distribution of Legionella in water and their potential threat to human health, the Legionella concentration in water for human use must be strictly monitored, which is difficult since the standard detection still relies on lengthy cultivation and analysis of bacterial morphology...
May 8, 2017: Human Antibodies
https://www.readbyqxmd.com/read/28582726/the-vibrational-properties-of-the-bee-killer-imidacloprid-insecticide-a-molecular-description
#14
Antônio A G Moreira, Pedro De Lima-Neto, Ewerton W S Caetano, Ito L Barroso-Neto, Valder N Freire
The chemical imidacloprid belongs to the neonicotinoids insecticide class, widely used for insect pest control mainly for crop protection. However, imidacloprid is a non-selective agrochemical to the insects and it is able to kill the most important pollinators, the bees. The high toxicity of imidacloprid requires controlled release and continuous monitoring. For this purpose, high performance liquid chromatography (HPLC) is usually employed; infrared and Raman spectroscopy, however, are simple and viable techniques that can be adapted to portable devices for field application...
May 29, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28580760/stress-echocardiography-an-overview-for-use-in-pediatric-and-congenital-cardiology
#15
Peter Ermis
Currently, the role of stress echocardiography primarily resides in diagnosing acquired coronary artery disease (CAD) in adults. Besides an increasing concern for traditional CAD in young patients due to obesity and other chronic pediatric diseases, there is also a growing population of adolescents and young adults with "at risk" coronary arteries due to: reimplanted coronaries in congenital heart disease, anomalous origin of the native coronary arteries, coronary abnormalities in Kawasaki's disease, and posttransplant coronary vasculopathy...
June 5, 2017: Congenital Heart Disease
https://www.readbyqxmd.com/read/28580428/peptide-mediated-nanopore-detection-of-uranyl-ions-in-aqueous-media
#16
Golbarg M Roozbahani, Xiaohan Chen, Youwen Zhang, Ruiqi Xie, Rui Ma, Dien Li, Huazhong Li, Xiyun Guan
Uranium is one of the most common radioactive contaminants in the environment. As a major nuclear material in production, environmental samples (like soil and groundwater) can provide signatures on uranium production activity inside the facility. Thus, developing a new and portable analytical technology for uranium in aqueous media is significant not only for environmental monitoring, but also for nonproliferation. In this work, a label-free method for the detection of uranyl (UO2(2+)) ions is developed by monitoring the translocation of a peptide probe in a nanopore...
May 26, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28579753/automated-retinal-imaging-and-trend-analysis-a-tool-for-health-monitoring
#17
Karin Roesch, Tristan Swedish, Ramesh Raskar
Most current diagnostic devices are expensive, require trained specialists to operate and gather static images with sparse data points. This leads to preventable diseases going undetected until late stage, resulting in greatly narrowed treatment options. This is especially true for retinal imaging. Future solutions are low cost, portable, self-administered by the patient, and capable of providing multiple data points, population analysis, and trending. This enables preventative interventions through mass accessibility, constant monitoring, and predictive modeling...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28575167/evaluation-of-real-world-implementation-of-partitioning-and-negative-pressurization-for-preventing-the-dispersion-of-dust-from-renovation-sites
#18
Anna Kokkonen, Markku Linnainmaa, Arto Säämänen, Vuokko Lappalainen, Mikko Kolehmainen, Pertti Pasanen
Objectives: The aim of this study was to assess the implementation of partitioning and the negative pressure method in limiting the dispersion of dust to areas adjacent to renovation sites. Methods: The pressure difference between the worksites and adjacent areas and PM10 concentrations in the both zones were measured in 12 renovation sites, and the factors affecting the prevention of dispersion of dust were assessed. Results: Poor implementation of partitioning and negative pressurization found in half of the renovation sites lead difficulties in achieving a proper negative pressure, causing dispersion of dust into adjacent areas...
May 30, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28572902/bioinspired-m-13-bacteriophage-based-photonic-nose-for-differential-cell-recognition
#19
Jong-Sik Moon, Won-Geun Kim, Dong-Myeong Shin, So-Young Lee, Chuntae Kim, Yujin Lee, Jiye Han, Kyujung Kim, So Young Yoo, Jin-Woo Oh
A bioinspired M-13 bacteriophage-based photonic nose was developed for differential cell recognition. The M-13 bacteriophage-based photonic nose exhibits characteristic color patterns when phage bundle nanostructures, which were genetically modified to selectively capture vapor phase molecules, are structurally deformed. We characterized the color patterns of the phage bundle nanostructure in response to cell proliferation via several biomarkers differentially produced by cells, including hydrazine, o-xylene, ethylbenzene, ethanol and toluene...
February 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28567011/imaging-brain-function-with-functional-near-infrared-spectroscopy-in-unconstrained-environments
#20
Joana B Balardin, Guilherme A Zimeo Morais, Rogério A Furucho, Lucas Trambaiolli, Patricia Vanzella, Claudinei Biazoli, João R Sato
Assessing the neural correlates of motor and cognitive processes under naturalistic experimentation is challenging due to the movement constraints of traditional brain imaging technologies. The recent advent of portable technologies that are less sensitive to motion artifacts such as Functional Near Infrared Spectroscopy (fNIRS) have been made possible the study of brain function in freely-moving participants. In this paper, we describe a series of proof-of-concept experiments examining the potential of fNIRS in assessing the neural correlates of cognitive and motor processes in unconstrained environments...
2017: Frontiers in Human Neuroscience
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