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https://www.readbyqxmd.com/read/28105834/in-line-acidification-for-potentiometric-sensing-of-nitrite-in-natural-waters
#1
Nadezda Pankratova, Maria Cuartero, Thomas Cherubini, Gaston A Crespo, Eric Bakker
We report on a novel approach for in-line sample acidification that results in a significant improvement in the limit of detection of potentiometric anion-selective electrodes aiming at determining nutrients in natural waters. The working principle of the developed acidification module relies on the cation-exchange process between the sample and an ion-exchange Donnan exclusion membrane in its protonated form. The resulting in-line acidification of natural waters with millimolar sodium chloride level (freshwater, drinking water, and aquarium water, as well as dechloridized seawater) decreases the pH down to ∼5...
January 3, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28101957/summer-co-existence-of-small-sized-cyprinid-and-percid-individuals-in-natural-and-impounded-stretches-of-a-lowland-river-food-niche-partitioning-among-fishes
#2
J Lik, M Dukowska, M Grzybkowska, J Leszczyńska
Due to changes of discharge regime downstream of a dam reservoir, an alluvial natural stretch of the Warta River changed to a macrophyte-dominated ecosystem. Large patches of submersed, aquatic macrophytes appeared in summer and their effect is analysed in this study. These patches contained enriched macroinvertebrate assemblages (epiphyton and benthos) and they were refuge for both zooplankton and young fishes released from the reservoir. Despite these altered conditions in this stretch, roach Rutilus rutilus, perch Perca fluviatilis and ruffe Gymnocephalus cernua dominated, as they did in the natural backwater...
January 18, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28097647/microbiota-composition-and-pulmonary-surfactant-protein-expression-as-markers-of-death-by-drowning
#3
So-Yeon Lee, Seung-Kyun Woo, So-Min Lee, Eun-Ju Ha, Kyoung-Hee Lim, Kyung-Hwa Choi, Young-Hee Roh, Yong-Bin Eom
Pathological diagnosis of drowning remains a challenge for forensic science, because of a lack of pathognomonic findings. We analyzed microbiota and surfactant protein in the lungs for a novel diagnosis of drowning. All rats were divided into drowning, postmortem submersion, and control groups. The water, lungs, closed organs (kidney and liver), and cardiac blood in rats were assayed by targeting 16S ribosomal RNA of Miseq sequencing. Lung samples were analyzed by immunohistochemical staining for surfactant protein A...
January 18, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28090443/topographical-and-depth-dependent-glycosaminoglycan-concentration-in-canine-medial-tibial-cartilage-3-weeks-after-anterior-cruciate-ligament-transection-surgery-a-microscopic-imaging-study
#4
Daniel Mittelstaedt, David Kahn, Yang Xia
BACKGROUND: Medical imaging has become an invaluable tool to diagnose damage to cartilage. Depletion of glycosaminoglycans (GAG) has been shown to be one of the early signs of cartilage degradation. In order to investigate the topographical changes in GAG concentration caused by the anterior cruciate ligament transection (ACLT) surgery in a canine model, microscopic magnetic resonance imaging (µMRI) and microscopic computed tomography (µCT) were used to measure the GAG concentration with correlation from a biochemical assay, inductively coupled plasma optical emission spectroscopy (ICP-OES), to understand where the topographical and depth-dependent changes in the GAG concentration occur...
December 2016: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28061378/assessment-of-pain-in-adolescents-influence-of-gender-smoking-status-and-tobacco-abstinence
#5
Kara S Bagot, Ran Wu, Dana Cavallo, Suchitra Krishnan-Sarin
PURPOSE: We examined sex differences between smokers and nonsmokers in pain threshold, tolerance, and intensity and the effect of pain on cardiovascular measures, withdrawal, and craving during acute smoking abstinence. METHODS: Ninety-six (53 smokers, 43 nonsmokers) adolescents completed the Cold Pressor Task (CPT) to assess pain responses after minimal (1h) and 42-hour smoking deprivation. Vital signs and craving were assessed before and after CPT completion. RESULTS: Smokers, compared to nonsmokers, had significantly lower pain tolerance (p<0...
December 26, 2016: Addictive Behaviors
https://www.readbyqxmd.com/read/28055864/a-sub-nyquist-variable-sampling-high-frequency-phased-array-beamformer
#6
Christopher A Samson, Andre Bezanson, Jeremy A Brown
A digital receive beamformer implementing a 'one sample per pixel' variable sampling technique is described. The sampling method reduces the required sampling rates by a factor of 3, and reduces the data capture rate by a factor of 2, in comparison to previous systems based on variable sampling. The sampling method is capable of estimating broadband pulse envelopes accurate for bandwidths up to 83.0%. This beamforming method has been implemented on an FPGA with maximum transmit and receive delay errors measured to be less than ± 1...
December 30, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28054448/taxonomic-research-on-deep-sea-macrofauna-in-the-south-china-sea-using-the-chinese-deep-sea-submersible-jiaolong
#7
REVIEW
Xinzheng Li
This paper reviews the taxonomic and biodiversity studies of the deep-sea invertebrates in the South China Sea based on the samples collected by the Chinese manned deep-sea submersible Jiaolong. To date, six new species were described, including the sponges Lophophysema eversa Gong, Li & Qiu, 2014, Saccocalyx microhexactin Gong, Li & Qiu, 2015, and Semperella jiaolongae Gong, Li & Qiu, 2015 as well as the crustaceans Uroptychus jiaolongae Dong & Li, 2015, Uroptychus spinulosus Dong & Li, 2015 and Globospongicola jiaolongi Jiang, Kou & Li, 2015, and some newly recorded species from the South China Sea were reported...
January 5, 2017: Integrative Zoology
https://www.readbyqxmd.com/read/27995265/a-case-of-adult-submersion-injury-with-clinical-and-radiological-evidence-of-severe-brain-and-lung-injury-and-subsequent-complete-clinical-recovery
#8
Wen Jun Koh, Choon Peng Jeremy Wee, Duu Wen Sewa, Ting Hway Wong
No abstract text is available yet for this article.
December 2016: Singapore Medical Journal
https://www.readbyqxmd.com/read/27994497/menthol-inhibiting-parasympathetic-function-of-tracheal-smooth-muscle
#9
Hsing-Won Wang, Shao-Cheng Liu, Pin-Zhir Chao, Fei-Peng Lee
Menthol is used as a constituent of food and drink, tobacco and cosmetics nowadays. This cold receptor agonist has been used as a nasal inhalation solution in the daily life. The effect of menthol on nasal mucosa in vivo is well known; however, the effect of the drug on tracheal smooth muscle has been rarely explored. Therefore, during administration of the drug for nasal symptoms, it might also affect the trachea via oral intake or inhalation. We used our preparation to test the effectiveness of menthol on isolated rat tracheal smooth muscle...
2016: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/27989127/wetting-and-dewetting-transitions-on-submerged-superhydrophobic-surfaces-with-hierarchical-structures
#10
Huaping Wu, Zhe Yang, Binbin Cao, Zheng Zhang, Kai Zhu, Bingbing Wu, Shaofei Jiang, Guozhong Chai
The wetting transition on submersed superhydrophobic surfaces with hierarchical structures and the influence of trapped air on superhydrophobic stability are predicted based on the thermodynamics and mechanical analyses. The dewetting transition on the hierarchically structured surfaces is investigated, and two necessary thermodynamic conditions and a mechanical balance condition for dewetting transition are proposed. The corresponding thermodynamic phase diagram of reversible transition and the critical reversed pressure well explain the experimental results reported previously...
December 29, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27940407/electricity-generation-and-microbial-community-in-response-to-short-term-changes-in-stack-connection-of-self-stacked-submersible-microbial-fuel-cell-powered-by-glycerol
#11
Nannan Zhao, Irini Angelidaki, Yifeng Zhang
Stack connection (i.e., in series or parallel) of microbial fuel cell (MFC) is an efficient way to boost the power output for practical application. However, there is little information available on short-term changes in stack connection and its effect on the electricity generation and microbial community. In this study, a self-stacked submersible microbial fuel cell (SSMFC) powered by glycerol was tested to elucidate this important issue. In series connection, the maximum voltage output reached to 1.15 V, while maximum current density was 5...
February 1, 2017: Water Research
https://www.readbyqxmd.com/read/27916365/efficacy-and-safety-of-innoseal-for-air-leak-after-pulmonary-resection-a-case-control-study
#12
Francesco Petrella, Alessandro Borri, Daniela Brambilla, Giorgio Calanca, Nicola Vezzani, Antonio Colantoni, Adolfo Gasparetto, Lorenzo Spaggiari
BACKGROUND: Prolonged air leak is one of the most common complications after lung surgery and the cause of prolonged hospital stay frequently associated with major postoperative morbidity and thus responsible for even higher hospital costs. This case-control study was designed to test the sealing efficacy and safety of Enable-Innoseal TP4 in patients undergoing pulmonary resection for lung cancer. METHODS: This was a case-control trial enrolling patients with primary or single site metastatic lung cancer scheduled for elective anatomic or nonanatomic pulmonary resection presenting intraoperative grade 1 or 2 air leak at water submersion test; the study group population was then matched 1:1 according to surgical procedure, male/female ratio, preoperative FEV1, and age...
November 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/27882279/research-on-the-water-entry-attitude-of-a-submersible-aircraft
#13
BaoWei Xu, YongLi Li, JinFu Feng, JunHua Hu, Duo Qi, Jian Yang
BACKGROUND: The water entry of a submersible aircraft, which is transient, highly coupled, and nonlinear, is complicated. After analyzing the mechanics of this process, the change rate of every variable is considered. A dynamic model is build and employed to study vehicle attitude and overturn phenomenon during water entry. Experiments are carried out and a method to organize experiment data is proposed. The accuracy of the method is confirmed by comparing the results of simulation of dynamic model and experiment under the same condition...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27853743/a-novel-adjunctive-cleansing-method-to-reduce-colony-forming-units-on-duodenoscopes
#14
Karl Kwok, Joseph Chang, Simon Lo, Andrew Giap, Brian Lim, Bechien Wu
Background and study aims: Endoscopic retrograde cholangiopancreatography-related infections are of increasing global concern due to the emergence of multidrug-resistant bacteria such as carbapenem-resistant enterobacteriaceae (CRE), with bacterial biofilm production postulated as one cause of persistent infection from such virulent organisms. Because N-acetylcysteine (NAC) has been shown to possess antibacterial and biofilm-disruption properties, we aimed to evaluate if NAC would demonstrate clinical utility in reducing the colony forming units (CFU) at the elevator end of a duodenoscope, one of the hardest areas to clean...
November 2016: Endoscopy International Open
https://www.readbyqxmd.com/read/27850744/1107-a-retrospective-analysis-of-submersion-injury-data-for-san-bernardino-county-aug-2007-to-sep-2014
#15
Jesse Wyatt, Marti Baum, Alexandra Iacob, Gordon Tan, James Martinez, Shamel Abd-Allah
No abstract text is available yet for this article.
December 2016: Critical Care Medicine
https://www.readbyqxmd.com/read/27816024/characterization-and-performance-of-anodic-mixed-culture-biofilms-in-submersed-microbial-fuel-cells
#16
Beenish Saba, Ann D Christy, Zhongtang Yu, Anne C Co, Rafiq Islam, Olli H Tuovinen
Microbial fuel cells (MFCs) were designed for laboratory scale experiments to study electroactive biofilms in anodic chambers. Anodic biofilms and current generation during biofilm growth were examined using single chambered MFCs submersed in algal catholyte. A culture of the marine green alga Nanochloropsis salina was used as a biocatholyte, and a rumen fluid microbiota was the anodic chamber inoculum. Electrical impedance spectroscopy was performed under varying external resistance once a week to identify mass transport limitations at the biofilm-electrolyte interface during the four-week experiment...
February 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/27811733/the-rare-deep-living-hyperiid-amphipod-megalanceoloides-remipes-barnard-1932-complementary-description-and-symbiosis
#17
Rebeca Gasca, Steven H D Haddock
A female ovigerous specimen of the rare deep-living hyperiid Megalanceoloides remipes (Barnard, 1932) was collected with a remotely operated submersible (ROV) at a depth of 2,094 m in the Farallon Basin, Gulf of California. The specimen was found to be symbiotically associated with the siphonophore Apolemia sp. Eschscholtz, 1829. Hitherto, this species was known only from two other specimens, one from the South Atlantic and another from the Indian Ocean; the present record is the first from the Pacific Ocean...
October 20, 2016: Zootaxa
https://www.readbyqxmd.com/read/27801599/is-v%C3%AC-o2-supressed-during-nonapnoeic-facial-submersion
#18
Sarah Anderson, Maggie R Chamberlain, Samantha Musgrove, Antonia Partusch, Keagan R J Tice, David B Thorp
The mammalian dive response (DR) is described as oxygen-conserving based on measures of bradycardia, peripheral vasoconstriction, and decreased ventilation (V̇E). Using a model of simulated diving, this study examined the effect of nonapnoeic facial submersions (NAFS) on oxygen consumption (V̇O2). 19 participants performed four 2-min NAFS with 8 min of rest between each. Two submersions were performed in 5 °C water, 2 in 25 °C water. Heart rate (HR) was collected using chest strap monitors. A tube connected to the inspired port of a non-rebreathing valve allowed participants to breathe during facial submersion...
November 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/27796323/air-exposure-of-coral-is-a-significant-source-of-dimethylsulfide-dms-to-the-atmosphere
#19
Frances E Hopkins, Thomas G Bell, Mingxi Yang, David J Suggett, Michael Steinke
Corals are prolific producers of dimethylsulfoniopropionate (DMSP). High atmospheric concentrations of the DMSP breakdown product dimethylsulfide (DMS) have been linked to coral reefs during low tides. DMS is a potentially key sulfur source to the tropical atmosphere, but DMS emission from corals during tidal exposure is not well quantified. Here we show that gas phase DMS concentrations (DMSgas) increased by an order of magnitude when three Indo-Pacific corals were exposed to air in laboratory experiments...
October 31, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27789242/observed-long-term-mortality-after-18-000-person-years-among-survivors-in-a-large-regional-drowning-registry
#20
Joshua C Reynolds, Erica A Michiels, Mojdeh Nasiri, Mathew J Reeves, Linda Quan
AIM: Long-term outcomes beyond one year after non-fatal drowning are uncharacterized. We estimated long-term mortality and identified prognostic factors in a large, population-based cohort. METHODS: Population-based prospective cohort study (1974-1996) of Western Washington Drowning Registry (WWDR) subjects surviving the index drowning through hospital discharge. Primary outcome was all-cause mortality through 2012. We tabulated Utstein-style exposure variables, estimated Kaplan-Meier curves, and identified prognostic factors with Cox proportional hazard modeling...
January 2017: Resuscitation
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