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https://www.readbyqxmd.com/read/28079493/ernst-mach-invents-a-new-sphygmograph
#1
Alexandre Métraux
Argument The sphygmograph as designed and tested by Jules-Étienne Marey - an apparatus destined to write pulse tracings on paper - revolutionized medical diagnostics in the early 1860s. Since the accuracy with which this device registered and objectified the pulse was controversial from the outset, the young scholar Ernst Mach (soon to become a leading theoretician and philosopher) decided to thoroughly examine Marey's sphygmograph. The investigation led to the invention of an alternative, truly Machian, sphygmograph...
December 2016: Science in Context
https://www.readbyqxmd.com/read/28077859/benefits-of-whole-body-vibration-training-on-arterial-function-and-muscle-strength-in-young-overweight-obese-women
#2
Stacey Alvarez-Alvarado, Salvador J Jaime, Michael J Ormsbee, Jeremiah C Campbell, Joy Post, Jacob Pacilio, Arturo Figueroa
The early arterial dysfunction linked with obesity and a sedentary lifestyle heightens the likelihood of suffering from future cardiovascular events. Whole-body vibration training (WBVT) may improve systemic arterial stiffness (brachial-ankle pulse wave velocity (baPWV)) and muscle strength in pre- and post-menopausal women. However, the effectiveness of WBVT to impact the arterial segments included in baPWV is unknown. The aim of this study was to investigate the effects of WBVT on aortic and leg arterial stiffness in young sedentary overweight/obese women...
January 12, 2017: Hypertension Research: Official Journal of the Japanese Society of Hypertension
https://www.readbyqxmd.com/read/28074645/highly-sensitive-bendable-and-foldable-paper-sensors-based-on-reduced-graphene-oxide
#3
Biswajit Saha, Sangwoong Baek, Junghoon Lee
Over the past decade, the demand for high-performance wearable sensors has increased because of their capability for interaction with humans. Such sensors have typically been prepared on conventional substrates, such as silicon, PDMS, and copper mesh. In this work, we propose a class of wearable sensors fabricated from reduced graphene oxide (rGO) patterned paper substrates (rGO-paper). These rGO-paper sensors are highly sensitive to various deformations and capable of measuring bending and folding angles as small as 0...
January 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28074635/physician-step-prescription-and-monitoring-to-improve-arterial-health-smarter-a-randomized-controlled-trial-in-type-2-diabetes-and-hypertension
#4
Kaberi Dasgupta, Ellen Rosenberg, Lawrence Joseph, Alexandra B Cooke, Luc Trudeau, Simon L Bacon, Deborah Chan, Mark Sherman, Rémi Rabasa-Lhoret, Stella S Daskalopoulou
AIMS: There are few strategies proven to enhance physical activity and cardiometabolic profiles in type 2 diabetes and hypertension. We examined the effects of physician-delivered step count prescriptions and monitoring. METHODS: Participants randomized to the active arm were provided with pedometers and recorded step counts. Over a 1-year period, their physicians reviewed their records and provided a written step count prescription at each clinic visit. The overall goal was a 3,000 step/day increase over 1-year (individualized rate of increase)...
January 11, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28071701/simultaneous-abrupt-shifts-in-hydrology-and-fish-assemblage-structure-in-a-floodplain-lake-in-the-central-amazon
#5
Cristhiana P Röpke, Sidinéia Amadio, Jansen Zuanon, Efrem J G Ferreira, Cláudia Pereira de Deus, Tiago H S Pires, Kirk O Winemiller
Combined effects of climate change and deforestation have altered precipitation patterns in the Amazon. This has led to changes in the frequency of extreme events of flood and drought in recent decades and in the magnitude of the annual flood pulse, a phenomenon that influences virtually all aspects of river-floodplain ecosystem dynamics. Analysis of long-term data revealed abrupt and synchronous changes in hydrology and fish assemblage structure of a floodplain lake near the confluence of Amazon and Negro rivers...
January 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28059301/spatial-dimming-scheme-for-optical-ofdm-based-visible-light-communication
#6
Yang Yang, Zhimin Zeng, Julian Cheng, Caili Guo
A new dimming control scheme termed spatial dimming orthogonal frequency division multiplexing (SD-OFDM) is proposed for multiple-input and multiple output OFDM based visible light communication. The basic idea of SD-OFDM is that the illumination can be represented by the number of glared light emitting diodes (LEDs) in an LED lamp. As the biasing level of LEDs does not adjust to represent the required illumination level, the proposed scheme can significantly mitigate the clipping noise compared to analogue dimming schemes...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28059148/enhancement-of-mosquito-trapping-efficiency-by-using-pulse-width-modulated-light-emitting-diodes
#7
Yu-Nan Liu, Yu-Jen Liu, Yi-Chian Chen, Hsin-Yi Ma, Hsiao-Yi Lee
In this study, a light-driving bug zapper is presented for well controlling the diseases brought by insects, such as mosquitoes. In order to have the device efficient to trap the insect pests in off-grid areas, pulse width modulated light emitting diodes (PWM-LED) combined with a solar power module are proposed and implemented. With specific PWM electric signals to drive the LED, it is found that no matter what the ability of catching insects or the consumed power efficiency can be enhanced thus. It is demonstrated that 40% of the UV LED consumed power and 25...
January 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28057349/flow-patterns-in-the-jugular-veins-of-pulsatile-tinnitus-patients
#8
Evan Kao, Sarah Kefayati, Matthew R Amans, Farshid Faraji, Megan Ballweber, Van Halbach, David Saloner
Pulsatile Tinnitus (PT) is a pulse-synchronous sound heard in the absence of an external source. PT is often related to abnormal flow in vascular structures near the cochlea. One vascular territory implicated in PT is the internal jugular vein (IJV). Using computational fluid dynamics (CFD) based on patient-specific Magnetic Resonance Imaging (MRI), we investigated the flow within the IJV of seven subjects, four symptomatic and three asymptomatic of PT. We found that there were two extreme anatomic types classified by the shape and position of the jugular bulbs: elevated and rounded...
December 14, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/28056788/genotype-variation-and-genetic-relationship-among-escherichia-coli-from-nursery-pigs-located-in-different-pens-in-the-same-farm
#9
Ana Herrero-Fresno, Shahana Ahmed, Monica Hegstad Hansen, Matthew Denwood, Camilla Zachariasen, John Elmerdahl Olsen
BACKGROUND: So far, little is known about the genetic diversity and relatedness among Escherichia coli (E. coli) populations in the gut of swine. Information on this is required to improve modeling studies on antimicrobial resistance aiming to fight its occurrence and development. This work evaluated the genotype variation of E. coli isolated from swine fecal samples at the single pig and pen level, as well as between pens using repetitive extragenic palindromic (REP) PCR fingerprinting and pulsed field gel electrophoresis (PFGE)...
January 5, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28056476/-advanced-systemic-sclerosis-endovascular-reconstruction-of-the-aortic-bifurcation-for-limb-salvage
#10
Florian Stein, Lars Kamper, Konstantinos Meletiadis, Ulrich Kusenack, Patrick Haage
History and admission findings A 69-year-old patient was initially hospitalized because of a 1.5 cm ulceration at the back of the right foot which had existed for the last year and become increasingly swollen and painful. Medical history revealed PmScl-positive systemic sclerosis presenting with a massive calcinosis cutis, advanced pulmonary fibrosis and peripheral artery disease. Examinations Inflammatory markers were normal. MR-Angiography of the lower extremities revealed a multi-segmental high-grade stenosis of the aortic bifurcation due to extensively calcified plaques...
January 2017: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/28052545/safety-feasibility-and-effectiveness-of-first-in-human-administration-of-muscle-derived-stem-progenitor-cells-modified-with-connexin-43-gene-for-treatment-of-advanced-chronic-heart-failure
#11
Adrian Gwizdala, Natalia Rozwadowska, Tomasz Jan Kolanowski, Agnieszka Malcher, Aleksandra Cieplucha, Bartlomiej Perek, Wojciech Seniuk, Ewa Straburzynska-Migaj, Zofia Oko-Sarnowska, Witold Cholewinski, Michal Michalak, Stefan Grajek, Maciej Kurpisz
AIMS: To assess the safety and efficacy of transendocardial delivery of muscle-derived stem/progenitor cells with connexin-43 overexpression (Cx-43-MDS/PC) in advanced heart failure (HF). METHODS AND RESULTS: Thirteen subjects with advanced HF, New York Heart Association (NYHA) class II-III were enrolled and treated with targeted injection of Cx-43-MDS/PCs and then monitored for at least 6 months. Overexpression of Cx43 (Cx43+) was significantly higher in all but one subject (Cx43-)...
January 2017: European Journal of Heart Failure
https://www.readbyqxmd.com/read/28040961/note-nanosecond-led-based-source-for-optical-modeling-of-scintillators-illuminated-by-partially-coherent-x-ray-radiation
#12
M Siano, B Paroli, E Chiadroni, M Ferrario, M A C Potenza
We developed a broad-spectrum light source specifically designed to reproduce the temporal behavior of the optical pulses emitted by scintillators for X-ray detection. Nanosecond-to-millisecond pulses are generated through a fast circuit driving Light Emitting Diodes (LEDs) and are endowed with the peculiar time features of the most employed scintillators by means of a dedicated pulse shaping stage. We implement the light source for the optical modeling of the single-shot X-ray coherence measurements with near-field speckles generated by the scattering from colloidal suspensions (heterodyne near field speckle method)...
December 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28036008/food-and-nutrition-insecurity-in-selected-rural-communities-of-kwazulu-natal-south-africa-linking-human-nutrition-and-agriculture
#13
REVIEW
Laurencia Govender, Kirthee Pillay, Muthulisi Siwela, Albert Modi, Tafadzwanashe Mabhaudhi
Lack of access to nutritious and balanced diets remains a major impediment to the health and well-being of people living in rural areas. The study utilizes a qualitative systematic approach to conduct an environmental scan and review of scientific literature of studies conducted in South Africa, specifically KwaZulu-Natal (KZN). Availability and access to nutritious, diverse and balanced diets were identified as key constraints for achieving food and nutrition security as well as for human health and well-being...
December 27, 2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28027236/complementary-effects-of-negative-pressure-wound-therapy-and-pulsed-radiofrequency-energy-on-cutaneous-wound-healing-in-diabetic-mice
#14
Bin Chen, Huang-Kai Kao, Ziqing Dong, Zhaohua Jiang, Lifei Guo
BACKGROUND: Negative-pressure wound therapy and pulsed radiofrequency energy are two clinical modalities used to treat soft-tissue wounds. They are purported to affect healing differently. The aim of this experimental study was to contrast the two modalities at a mechanistic level and to investigate whether their combined therapy could achieve additive and complementary effects on wound healing. METHODS: Full-thickness dorsal cutaneous wounds of diabetic, db/db, mice were treated with either negative-pressure wound therapy, pulsed radiofrequency energy, or combined therapies...
January 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28018454/idiopathic-midaortic-syndrome-with-malignant-hypertension-in-3-year-old-boy
#15
Kyung Jin Ahn, Ja Kyoung Yoon, Gi Beom Kim, Bo Sang Kwon, Eun Jung Bae, Chung Il Noh
Midaortic syndrome (MAS) is a rare vascular disease that commonly causes renovascular hypertension. The lumen of the abdominal aorta narrows and the ostia of the branches show stenosis. MAS is associated with diminished pulses in the lower extremities compared with the upper extremities, severe hypertension with higher blood pressure in the upper rather than lower extremities, and an abdominal bruit. The clinical symptoms are variable, and recognition in children with hypertension can aid early diagnosis and optimal treatment...
November 2016: Korean Journal of Pediatrics
https://www.readbyqxmd.com/read/28011414/an-electrochemical-dna-sensor-without-electrode-pre-modification
#16
Nian Hong, Lin Cheng, BingGuo Wei, ChaDan Chen, Ling Ling He, DeRong Kong, JinXiang Ceng, Han-Feng Cui, Hao Fan
We present a non-modification electrochemical DNA sensing strategy, which used Potential-Assisted Au-S Deposition and a clamp-like DNA probe. The dual-hairpin probe DNA was tagged with a methylene blue (MB) at the 3' terminal and a thiol at the 5' terminal., Without being hybridized with target DNA, the loop of probe prevented the thiol from reaching the bare gold electrode surface with an applied potential., After hybridization with the target DNA, the probe' s loop-stem structure opened through two distinct and sequential events, which led to the formation of a triplex DNA structure...
October 5, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28009403/ocular-pulse-amplitude-after-panretinal-photocoagulation-in-normotensive-eyes-with-proliferative-diabetic-retinopathy
#17
Marija M Bozic, Jelena B Karadzic, Igor M Kovacevic, Ivan S Marjanovic
PURPOSE: To assess the effect of panretinal laser photocoagulation on ocular pulse amplitude (OPA) in normotensive eyes with proliferative diabetic retinopathy. METHODS: Prospectively, we performed unilateral argon laser panretinal photocoagulation (PRP) in 30 patients with diabetes mellitus type II and previously untreated bilateral proliferative diabetic retinopathy. Before and 7 and 30 days after the treatment, OPA was measured using dynamic contour tonometer...
November 28, 2016: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28007328/arterial-stiffness-in-subacute-stroke-changing-pattern-and-relationship-with-functional-recovery
#18
Eun Young Han, Bo Ryun Kim, Seung-Jae Joo, Chang Sub Lee, Sa-Yoon Kang, Song-Yi Kim, Joon Hyouk Choi, Chul Woong Hyun
BACKGROUND: To examine changing patterns in arterial stiffness and functional outcome in patients with subacute stroke, and to determine which parameter shows a strong correlation with the reversal of arterial stiffness, during a 3-month period of comprehensive rehabilitation therapy. METHODS: This descriptive, observational cohort study enrolled 60 patients (43 male and 17 female; average age, 62.7 years), and all received conventional rehabilitation therapy, during a 3-month period...
December 19, 2016: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28000607/polychromatic-ssvep-stimuli-with-subtle-flickering-adapted-to-brain-display-interactions
#19
Yu-Yi Chien, Fang-Cheng Lin, John Zao, Ching-Chi Chou, Yi-Pai Huang, Heng-Yuan Kuo, Yijun Wang, Tzyy-Ping Jung, Han-Ping D Shieh
OBJECTIVE: Interactive displays armed with natural user interfaces (NUIs) will likely lead the next breakthrough in consumer electronics, and brain-computer interfaces (BCIs) are often regarded as the ultimate NUI-enabling machines to respond to human emotions and mental states. Steady-state visual evoked potentials (SSVEPs) are a commonly used BCI modality due to the ease of detection and high information transfer rates. However, the presence of flickering stimuli may cause user discomfort and can even induce migraines and seizures...
December 21, 2016: Journal of Neural Engineering
https://www.readbyqxmd.com/read/27997159/the-formation-time-of-ti-o-%C3%A2-and-ti-o-%C3%A2-ti-radicals-at-the-n-srtio3-aqueous-interface-during-photocatalytic-water-oxidation
#20
Xihan Chen, Stephanie N Choing, Daniel J Aschaffenburg, C D Pemmaraju, David Prendergast, Tanja Cuk
The initial step of photocatalytic water oxidation reaction at the metal oxide/aqueous interface involves intermediates formed by trapping photogenerated, valence band holes on different reactive sites of the oxide surface. In SrTiO3, these one-electron intermediates are radicals located in Ti-O(•) (oxyl) and Ti-O(•)-Ti (bridge) groups arranged perpendicular and parallel to the surface respectively, and form electronic states in the band gap of SrTiO3. Using an ultrafast sub band gap probe of 400 nm and white light, we excited transitions between these radical states and the conduction band...
December 20, 2016: Journal of the American Chemical Society
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