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https://www.readbyqxmd.com/read/29762606/intensity-modulated-directional-torsion-sensor-based-on-in-line-optical-fiber-mach-zehnder-interferometer
#1
Qinjiang Fu, Jingdong Zhang, Chuancan Liang, Iroegbu Paul Ikechukwu, Guolu Yin, Lei Lu, Yifan Shao, Liu Liu, Dongxiao Liu, Tao Zhu
In this Letter, we demonstrated an intensity-modulated directional torsion sensor based on an in-line Mach-Zehnder interferometer in single-mode fiber. A non-circular symmetric perturbation is created to excite non-circular symmetric cladding mode and then interference with the core mode at the second perturbation. An initial rotation angle is designed between two perturbations for the purpose of discriminating the torsion direction. Both experimental and theoretical results enforce that the spectral peak/dip turns to be the dip/peak when the fiber is twisted from the counter-clockwise to the clockwise direction...
May 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29759641/impact-of-antimicrobial-wipes-compared-with-hypochlorite-solution-on-environmental-surface-contamination-in-a-health-care-setting-a-double-crossover-study
#2
Harsha Siani, Rebecca Wesgate, Jean-Yves Maillard
OBJECTIVE: Antimicrobial wipes are increasingly used in health care settings. This study evaluates, in a clinical setting, the efficacy of sporicidal wipes versus a cloth soaked in a 1,000 ppm chlorine solution. INTERVENTION: A double-crossover study was performed on 2 different surgical and cardiovascular wards in a 1,000-bed teaching hospital over 29 weeks. The intervention period that consisted of surface decontamination with the preimpregnated wipe or cloth soaked in chlorine followed a 5-week baseline assessment of microbial bioburden on surfaces...
May 11, 2018: American Journal of Infection Control
https://www.readbyqxmd.com/read/29733344/impact-of-blunted-nocturnal-blood-pressure-dipping-on-cardiac-systolic-function-in-community-participants-not-receiving-anti-hypertensive-therapy
#3
Angela J Woodiwiss, Carlos D Libhaber, Pinhas Sareli, Gavin R Norton
Background: Blunted nocturnal blood pressure (BP) dipping (non-dipping) predicts cardiovascular morbidity and mortality, and is associated with heart failure (HF) independent of office BP. Whether non-dipping is independently associated with cardiac systolic function prior to the development of HF is uncertain. Methods: We assessed whether nocturnal BP dipping pattern and nocturnal BP were associated with indexes of cardiac systolic function [endocardial fractional shortening (endFS), midwallFS (mFS), ejection fraction (EF)] independent of left ventricular mass index (LVMI) and relative wall thickness (RWT) in 491 randomly selected community participants not receiving anti-hypertensive therapy...
May 4, 2018: American Journal of Hypertension
https://www.readbyqxmd.com/read/29729885/characteristics-of-the-iron-uptake-related-process-of-a-pathogenic-vibrio-splendidus-strain-associated-with-massive-mortalities-of-the-sea-cucumber-apostichopus-japonicus
#4
Tongxiang Song, Huijie Liu, Tengteng Lv, Xuelin Zhao, Yina Shao, Qingxi Han, Chenghua Li, Weiwei Zhang
Under low iron bioavailability environment, many bacteria acquire iron for growth and survival through siderophore-mediated iron acquisition systems. However, until now, little research on the growth, siderophore production and siderophore receptors of Vibrio splendidus Vs under iron limited conditions has been reported. In our present study, V. splendidus Vs could survive in media supplemented with 160 µM 2,2'-dipyridyl (DIP), but 74.5% of the growth was suppressed at 48 h, while the siderophore production of V...
May 3, 2018: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/29719424/heart-rate-phenotypes-and-clinical-correlates-in-a-large-cohort-of-adults-without-sleep-apnea
#5
Zhaoyang Huang, Balaji Goparaju, He Chen, Matt T Bianchi
Background: Normal sleep is associated with typical physiological changes in both the central and autonomic nervous systems. In particular, nocturnal blood pressure dipping has emerged as a strong marker of normal sleep physiology, whereas the absence of dipping or reverse dipping has been associated with cardiovascular risk. However, nocturnal blood pressure is not measured commonly in clinical practice. Heart rate (HR) dipping in sleep may be a similar important marker and is measured routinely in at-home and in-laboratory sleep testing...
2018: Nature and Science of Sleep
https://www.readbyqxmd.com/read/29715917/high-performance-all-fiber-temperature-sensor-based-on-coreless-side-polished-fiber-wrapped-with-polydimethylsiloxane
#6
Caiyan He, Junbin Fang, Yanan Zhang, Yu Yang, Jianhui Yu, Jun Zhang, Heyuan Guan, Wentao Qiu, Pengjun Wu, Jiangli Dong, Huihui Lu, Jieyuan Tang, Wenguo Zhu, N Arsad, Yi Xiao, Zhe Chen
A novel fiber structure, coreless side-polished fiber (CSPF) that is wrapped by polydimethylsiloxane (PDMS), is demonstrated to be highly sensitive to temperature because of the high refractive index sensitivity of the CSPF and the large thermal optic coefficient of the PDMS. Our numerical and experimental results show that the several dips in the transmitted spectra of PDMSW-CSPF is originated from the multimode interference (MMI) in the CSPF and will blueshift with the increase of temperature. Furthermore, for such a PDMSW-CSPF, we investigate its temperature sensing characteristics and the influences of residual thickness (RT) and dip wavelength on the sensitivity both numerically and experimentally...
April 16, 2018: Optics Express
https://www.readbyqxmd.com/read/29678625/ambulatory-blood-pressure-monitoring-profiles-in-a-cross-sectional-analysis-of-a-large-database-of-normotensive-and-true-or-suspected-hypertensive-patients
#7
Sara Araújo, Ana Rouxinol-Dias, José Mesquita-Bastos, José Silva, Loide Barbosa, Jorge Polónia
OBJECTIVE: To assess ambulatory blood pressure monitoring (ABPM) circadian patterns and their determinants in a large sample of normotensive and hypertensive patients. METHODS: A total of 26170 individual ABPM recordings from 1995 to 2015 were analyzed. Mean office blood pressure (OBP), 24-hour blood pressure (BP), daytime BP and nocturnal BP were measured. Circadian patterns were classified by nocturnal systolic BP fall as extreme dipper (ED, ≥20%), dipper (D, 10%-19...
April 17, 2018: Portuguese Journal of Cardiology: An Official Journal of the Portuguese Society of Cardiology
https://www.readbyqxmd.com/read/29619250/relationship-between-autonomic-cardiovascular-control-and-obstructive-sleep-apnoea-in-persons-with-spinal-cord-injury-a-retrospective-study
#8
Xizhe Fang, Min Yin Goh, Christopher O'Callaghan, David Berlowitz
Study design: Retrospective study. Objective: To determine if there is an association between obstructive sleep apnoea (OSA) and blood pressure (BP) pattern or heart rate variability (HRV) in people with spinal cord injury (SCI). Setting: A state-based spinal cord service in Victoria, Australia. Methods: We identified 42 subjects who had ambulatory BP monitoring (ABPM) within 6 months of a diagnostic sleep study at Austin Hospital between 2009 and 2014...
2018: Spinal Cord Series and Cases
https://www.readbyqxmd.com/read/29568670/analysis-of-iodinated-quorum-sensing-peptides-by-lc-uv-esi-ion-trap-mass-spectrometry
#9
Yorick Janssens, Frederick Verbeke, Nathan Debunne, Evelien Wynendaele, Kathelijne Peremans, Bart De Spiegeleer
Five different quorum sensing peptides (QSP) were iodinated using different iodination techniques. These iodinated peptides were analyzed using a C18 reversed phase HPLC system, applying a linear gradient of water and acetonitrile containing 0.1% (m/v) formic acid as mobile phase. Electrospray ionization (ESI) ion trap mass spectrometry was used for the identification of the modified peptides, while semi-quantification was performed using total ion current (TIC) spectra. Non-iodinated peptides and mono- and di-iodinated peptides (NIP, MIP and DIP respectively) were well separated and eluted in that order...
February 2018: Journal of Pharmaceutical Analysis
https://www.readbyqxmd.com/read/29524325/a-new-anode-for-lithium-ion-batteries-based-on-single-walled-carbon-nanotubes-and-graphene-improved-performance-through-a-binary-network-design
#10
Jing Ren, Rui-Peng Ren, Yong-Kang Lv
Carbon nanomaterials, especially graphene and carbon nanotubes, are considered to be favorable alternatives to graphite-based anodes in lithium-ion batteries, owing to their high specific surface area, electrical conductivity, and excellent mechanical flexibility. However, the limited number of storage sites for lithium ions within the sp2 -carbon hexahedrons leads to the low storage capacity. Thus, rational structure design is essential for the preparation of high-performance carbon-based anode materials. Herein, we employed flexible single-walled carbon nanotubes (SWCNTs) with ultrahigh electrical conductivity as a wrapper for 3D graphene foam (GF) by using a facile dip-coating process to form a binary network structure...
May 4, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29517128/noctural-dipping-status-and-left-ventricular-hypertrophy-a-cardiac-magnetic-resonance-imaging-study
#11
Jonathan C L Rodrigues, Antonio Matteo Amadu, Amardeep Ghosh Dastidar, Iwan Harries, Amy E Burchell, Laura E K Ratcliffe, Emma C Hart, Mark C K Hamilton, Julian F R Paton, Angus K Nightingale, Nathan E Manghat
We investigate the impact of dipper status on cardiac structure with cardiovascular magnetic resonance (CMR). Ambulatory blood pressure monitoring and 1.5T CMR were performed in 99 tertiary hypertension clinic patients. Subgroup analysis by extreme dipper (n = 9), dipper (n = 39), non-dipper (n = 35) and reverse dipper (n = 16) status was performed, matched in age, gender and BMI. Left ventricular (LV) mass was significantly higher for extreme dippers than dippers after correction for covariates (100 ± 6 g/m2 vs 79 ± 3 g/m2 , P = ...
April 2018: Journal of Clinical Hypertension
https://www.readbyqxmd.com/read/29500404/comparison-of-diurnal-blood-pressure-and-urine-production-between-people-with-and-without-chronic-spinal-cord-injury
#12
Min Yin Goh, Melinda S Millard, Edmund C K Wong, David J Berlowitz, Marnie Graco, Rachel M Schembri, Douglas J Brown, Albert G Frauman, Christopher J O'Callaghan
STUDY DESIGN: Observational study. OBJECTIVES: To quantify diurnal blood pressure (BP) patterns and nocturnal hypertension and to measure diurnal urine production in people with chronic spinal cord injury (SCI), compared with controls without SCI. SETTING: Chronic SCI population in the community in Victoria, Australia. METHODS: Participants were recruited by advertisement, and sustained SCI at least a year prior or were healthy able-bodied volunteers...
March 2, 2018: Spinal Cord
https://www.readbyqxmd.com/read/29479015/circadian-blood-pressure-variations-in-postmenopausal-females-with-hypertension
#13
Dan Su, Anqi Song, Bin Yan, Qi Guo, Ya Gao, Yanhua Zhou, Fuling Zhou, Guang Yang, Chaoying Zhang
The abnormalities of blood pressure (BP) nocturnal decline have been found to be predictive for carotid plaque and lacunar infarction in patients with hypertension. In this study, BP dipping patterns in postmenopausal females with hypertension were investigated. The nocturnal decline of systolic BP (SBP) was evaluated using 24-hour ambulatory BP monitoring (ABPM). A total of 163 postmenopausal females were eventually included in our study. The prevalence of reverse-dipper BP pattern was 32.3% in females with menopause age in their 40s and 40% in their 50s...
March 30, 2018: International Heart Journal
https://www.readbyqxmd.com/read/29442689/synthesis-and-characterization-of-silicon-reduced-graphene-oxide-composites-as-anodes-for-lithium-secondary-batteries
#14
Sang-Hoon Lee, Yong-Jae Kim, Ye-Seol Nam, Seong-Hyo Park, Hochun Lee, Yura Hyun, Chang-Seop Lee
Silicon (Si) is one of the most attractive anode materials for lithium secondary batteries because of its large theoretical capacity, high safety, low cost and environmental benignity. However, Si-based anode material needs to overcome the structural change of the solid-electrolyte interphase due to the large volume change during cycling. To resolve these problems of composites by exploiting the superior conductivity, large specific surface area and flexibility of graphene, we have synthesized reduced graphene oxide (rGO)/Si composite electrode via a simple dip-coating method...
July 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442516/engineering-nitroxide-functional-surfaces-using-bioinspired-adhesion
#15
Hendrik Woehlk, Jan Steinkoenig, Christiane Lang, Lukas Michalek, Vanessa Trouillet, Peter Krolla, Anja S Goldmann, Leonie Barner, James P Blinco, Christopher Barner-Kowollik, Kathryn E Fairfull-Smith
We pioneer a versatile surface modification strategy based on mussel-inspired oxidative catecholamine polymerization for the design of nitroxide-containing thin polymer films. A 3,4-dihydroxy-l-phenylalanine (l-DOPA) monomer equipped with a 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-derived oxidation-labile hydroxylamine functional group is employed as a universal coating agent to generate polymer scaffolds with persistent radical character. Various types of materials including silicon, titanium, ceramic alumina, and inert poly(tetrafluoroethylene) (PTFE) were successfully coated with poly(DOPA-TEMPO) thin films in a one-step dip-coating procedure under aerobic, slightly alkaline (pH 8...
March 13, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29420078/poor-sleep-is-responsible-for-the-impaired-nocturnal-blood-pressure-dipping-in-elderly-hypertensive-a-cross-sectional-study-of-elderly
#16
Shaopan Zhao, Shihui Fu, Jiefeng Ren, Leiming Luo
OBJECTIVE: This study was aimed to assess whether sleep disorder was associated with an increased risk of less nocturnal blood pressure (BP) dipping in elderly patients with hypertension. METHODS: Cases were 1006 patients, aged >60 years, who were admitted to hospital with diagnosed hypertension during 2016-2017, and were divided into three groups with the systolic nocturnal BP dipping of 10%, and 0% as the cut-off value. The patients' sleep was evaluated by Pittsburgh sleep quality index (PSQI)...
February 8, 2018: Clinical and Experimental Hypertension: CHE
https://www.readbyqxmd.com/read/29408101/tin-sulphide-nanoflowers-anchored-on-three-dimensional-porous-graphene-networks-as-high-performance-anode-for-sodium-ion-batteries
#17
Jiajia Ye, Zizhong Chen, Qiang Liu, Caixia Xu
The SnS2 nanoflowers anchored on three dimensional porous graphene were easily constructed with nickel foam (NF) as supported backbone through the dip-coating method followed by one-step controllable hydrothermal growth and mild reduction. The interconnected SnS2 nanoflowers with cross-linking nanosheets and rich pores assembled to form one layer of continuous network structure, which tightly adhered on the surface of graphene. The porous graphene supported by NF built a conductively integral highway that is preferable for the charge transfer kinetics, while the hierarchical pores from the SnS2 nanoflowers and NF are particularly beneficial for mitigating the volume expansion and promoting electrolyte penetration...
April 15, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29390325/evaluation-of-tolerance-to-ambulatory-blood-pressure-monitoring-analysis-of-dipping-profile-in-a-large-cohort-of-hypertensive-patients
#18
Gino Iannucci, Luigi Petramala, Giuseppe La Torre, Barbara Barbaro, Clara Balsano, Pietro Giacomo Curatulo, Francesco Amadei, Marino Paroli, Antonio Concistrè, Claudio Letizia
Ambulatory blood pressure monitoring (ABPM) is a helpful tool to comprehensively identify and diagnose arterial hypertension. Moreover, it allows to better identify alterations in the circadian BP profile, as the nocturnal "nondipping" status, characterized by a lack of the physiological 10% night BP reduction and associated with a greater risk of target organ damage. However, ABPM has some limitations such as restricted availability, discomfort, particularly at night, cost implications, and reproducibility...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29361721/poly-hydroxyalkanoate-s-based-hydrophobic-coatings-for-the-protection-of-stone-in-cultural-heritage
#19
Serena Andreotti, Elisa Franzoni, Paola Fabbri
Reversibility is a mandatory requirement for materials used in heritage conservation, including hydrophobic protectives. Nevertheless, current protectives for stone are not actually reversible as they remain on the surfaces for a long time after their hydrophobicity is lost and can hardly be removed. Ineffective and aged coatings may jeopardise the stone re-treatability and further conservation interventions. This paper aims at investigating the performance of PHAs-based coatings for stone protection, their main potential being the 'reversibility by biodegradation' once water repellency ended...
January 20, 2018: Materials
https://www.readbyqxmd.com/read/29328291/whispering-gallery-modes-in-a-single-silica-microparticle-attached-to-an-optical-microfiber-and-their-application-for-highly-sensitive-displacement-sensing
#20
Ningyu Liu, Lei Shi, Song Zhu, Xinbiao Xu, Shixing Yuan, Xinliang Zhang
A compact and relatively stable structure is experimentally demonstrated to excite whispering gallery modes (WGMs) in a single chemically fabricated silica microparticles with a diameter of around 10.6 μm attached to an optical microfiber. The resonance dip with an extinction ratio of 14 dB and Q factor of around 300 has been achieved. Based on the WGMs in this structure, an in-line fiber-optic displacement sensor is presented with a high sensitivity of 33 dB/mm and a measurement range of over 400 μm. The measurement resolution of this displacement sensor can reach to ~10 μm...
January 8, 2018: Optics Express
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