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https://www.readbyqxmd.com/read/28482368/validity-of-postexercise-measurements-to-estimate-peak-vo2-in-200-m-and-400-m-maximal-swims
#1
Ferran A Rodríguez, Diego Chaverri, Xavier Iglesias, Thorsten Schuller, Uwe Hoffmann
To assess the validity of postexercise measurements to estimate oxygen uptake (V˙O2) during swimming, we compared V˙O2 measured directly during an all-out 200-m swim with measurements estimated during 200-m and 400-m maximal tests using several methods, including a recent heart rate (HR)/V˙O2 modelling procedure. 25 elite swimmers performed a 200-m maximal swim where V˙O2 was measured using a swimming snorkel connected to a gas analyzer. The criterion variable was V˙O2 in the last 20 s of effort, which was compared with the following V˙O2peak estimates: 1) first 20-s average; 2) linear backward extrapolation (BE) of the first 20 and 30 s, 3×20-s, 4×20-s, and 3×20-s or 4×20-s averages; 3) semilogarithmic BE at the same intervals; and 4) predicted V˙O2peak using mathematical modelling of 0-20 s and 5-20 s during recovery...
May 8, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28479422/management-of-difficult-access-during-evar
#2
Yana Etkin, Asad Baig, Paul J Foley, Grace J Wang, Edward Y Woo, Jeffrey P Carpenter, Ronald M Fairman, Benjamin M Jackson
OBJECTIVES: To describe a large single institutional experience in managing challenging access situations during endovascular aneurysm repair (EVAR). METHODS: Data from all patients undergoing EVAR at a tertiary academic medical center between 2009 and 2013 was collected retrospectively, including demographics, size of iliac arteries, type of device used, approach to managing difficult access, and outcomes. The median follow-up was 38 months. Difficult access (DA) was defined as iliac arteries with a diameter of less than 7mm bilaterally...
May 4, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28475965/how-could-discharge-management-affect-florida-spring-fish-assemblage-structure
#3
Kirsten Work, Keneil Codner, Melissa Gibbs
Freshwater bodies are increasingly affected by reductions in water quantity and quality and by invasions of exotic species. To protect water quantity and maintain the ecological integrity of many water bodies in central Florida, a program of adopting Minimum Flows and Levels (MFLs) has begun for both lentic and lotic waters. The purpose of this study was to determine whether there were relationships between discharge and stage, water quality, and biological parameters for Volusia Blue Spring, a first magnitude spring (discharge > 380,000 m(3) day(-1) or 100 mgd) for which an MFL program was adopted in 2006...
May 2, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28464277/forensic-case-reports-presenting-immersion-pulmonary-edema-as-a-differential-diagnosis-in-fatal-diving-accidents
#4
Julie Vinkel, Peter Bak, Peter Juel Thiis Knudsen, Ole Hyldegaard
Immersion Pulmonary Edema (IPE) reduces the transport of gases over the respiratory membrane due to edema in the interstitium and respiratory zones. IPE has previously been described in both swimmers and divers, with a few known fatal cases. We have reviewed 42 SCUBA and snorkeling-related drowning deaths, and through a thorough analysis of each case, including both diving physiology and forensic pathology, we present IPE as a differential diagnosis to drowning in four cases. Our findings propose that; absence of watery content in the stomach and conducting airways, and liquid filled lungs without hyperexpansion, may be compatible with IPE...
May 2, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28460755/-snorkel-lice-barrier-technology-reduced-two-co-occurring-parasites-the-salmon-louse-lepeophtheirus-salmonis-and-the-amoebic-gill-disease-causing-agent-neoparamoeba-perurans-in-commercial-salmon-sea-cages
#5
D W Wright, L H Stien, T Dempster, T Vågseth, V Nola, J-E Fosseidengen, F Oppedal
Diverse chemical-free parasite controls are gaining status in Atlantic salmon sea-cage farming. Yet, the intricacies of their use at commercial scale, including effects on co-occurring parasites, are seldom reported. A new salmon lice prevention method involves installing a deep net roof and 'snorkel' lice barrier in cages to shelter salmon from free-living infective larvae which concentrate at shallow depths, and allows salmon to jump and re- inflate their buoyancy-regulating swim bladder by swallowing air...
May 1, 2017: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/28409218/transmembrane-helices-containing-a-charged-arginine-are-thermodynamically-stable
#6
Martin B Ulmschneider, Jakob P Ulmschneider, J Alfredo Freites, Gunnar von Heijne, Douglas J Tobias, Stephen H White
Hydrophobic amino acids are abundant in transmembrane (TM) helices of membrane proteins. Charged residues are sparse, apparently due to the unfavorable energetic cost of partitioning charges into nonpolar phases. Nevertheless, conserved arginine residues within TM helices regulate vital functions, such as ion channel voltage gating and integrin receptor inactivation. The energetic cost of arginine in various positions along hydrophobic helices has been controversial. Potential of mean force (PMF) calculations from atomistic molecular dynamics simulations predict very large energetic penalties, while in vitro experiments with Sec61 translocons indicate much smaller penalties, even for arginine in the center of hydrophobic TM helices...
April 13, 2017: European Biophysics Journal: EBJ
https://www.readbyqxmd.com/read/28390918/dynamic-geometric-analysis-of-the-renal-arteries-and-aorta-following-complex-endovascular-aneurysm-repair
#7
Brant W Ullery, Ga-Young Suh, John J Kim, Jason T Lee, Ronald L Dalman, Christopher P Cheng
INTRODUCTION: Aneurysm regression and target vessel patency during early and mid-term follow-up may be related to the effect of stent graft configuration on the anatomy. We quantified geometry and remodeling of the renal arteries and aneurysm following fenestrated (F-) or snorkel/chimney (Sn-) endovascular aneurysm repair (EVAR). METHODS: 29 patients (mean age, 76.8±7.8 years) treated with F- or Sn-EVAR underwent computed tomography angiography at pre-op, post-op, and follow-up...
April 5, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28343587/hybrid-snorkel-endovascular-repair-of-a-ruptured-abdominal-aortic-aneurysm-related-to-a-type-ia-endoleak-utilizing-an-axillary-conduit
#8
Ansar Z Vance, Charles R Fedele, Assaf Graif, D Bhaskar Rao, Daniel A Leung
No abstract text is available yet for this article.
April 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28342593/taxocoenosis-of-epibenthic-dinoflagellates-in-the-coastal-waters-of-the-northern-yucatan-peninsula-before-and-after-the-harmful-algal-bloom-event-in-2011-2012
#9
Ana C Aguilar-Trujillo, Yuri B Okolodkov, Jorge A Herrera-Silveira, Fany Del C Merino-Virgilio, Citlalli Galicia-García
Eutrophication causes the major impact in the coastal waters of the state of Yucatan. In general, loss of water quality and biological communities and massive development of toxic microorganisms are some of the consequences of this phenomenon. To reveal changes in species composition and cell abundance of the taxocoenosis of epibenthic dinoflagellates before and after a harmful algal bloom event in the water column that lasted about 150days (August-December 2011) in the Dzilam - San Crisanto area (northern Yucatan Peninsula, southeastern Gulf of Mexico) were the main objectives of the present study...
March 22, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28259824/endovascular-management-of-proximal-fixation-loss-using-parallel-stent-grafting-techniques-to-preserve-visceral-flow
#10
Adam Tanious, Mathew Wooster, Andrew Jung, Peter R Nelson, Martin R Back, Murray L Shames
BACKGROUND: Proximal fixation loss following endovascular aortic aneurysm repair (EVAR) creates a clinical dilemma. Typically, endovascular salvage requires adequate aortic neck below the renal arteries, in cases with no infrarenal neck proximal extension into the paravisceral aorta using parallel grafts provides an alternative to open graft explant. We present our experience at a tertiary care center with endovascular management of proximal fixation loss following EVAR using parallel stent grafting techniques to preserve renal and visceral branches...
March 1, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28247541/sea-lice-infestation-levels-decrease-with-deeper-snorkel-barriers-in-atlantic-salmon-sea-cages
#11
Frode Oppedal, Francisca Samsing, Tim Dempster, Daniel W Wright, Samantha Bui, Lars H Stien
BACKGROUND: Salmon lice (Lepeophtheirus salmonis) are the most important parasites of farmed salmon. Infective larvae position themselves in the upper part of the water column to increase encounter probabilities with potential hosts. Previous studies have shown that a 'snorkel' sea-cage technology protects salmon from infection in surface waters. We tested whether deep snorkels would more effectively reduce lice infestation than shallow snorkels and still uphold adequate conditions for the fish...
March 1, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28242400/endovascular-management-of-a-ruptured-aortic-arch-pseudoaneurysm-using-the-snorkel-technique-and-coil-embolization
#12
Tao Ma, Zhi Hui Dong, Wei Guo Fu, Bin Chen, Jun Hao Jiang, Yun Shi
We report a reoperation case of a ruptured infectious aortic arch pseudoaneurysm, which was stabilized with thoracic endovascular aortic repair and snorkel bypass of the innominate artery (IA) and the left common carotid artery (LCCA). A 57-year-old Chinese woman with multiple comorbidities and previous open repair for Stanford type A aortic dissection 5 years ago presented with a ruptured 10.7 cm × 7.3 cm aortic arch pseudoaneurysm involving the origins of the LCCA and the left subclavian artery. The patient underwent emergent endovascular aortic repair with placement of a stent graft in both IA and left carotid artery coursing parallel to the aortic arch endograft...
May 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28239356/sex-and-exercise-intensity-do-not-influence-oxygen-uptake-kinetics-in-submaximal-swimming
#13
Joana F Reis, Gregoire P Millet, Paula M Bruno, Veronica Vleck, Francisco B Alves
The aim of this study was to compare the oxygen uptake ([Formula: see text]) kinetics in front crawl between male and female swimmers at moderate and heavy intensity. We hypothesized that the time constant for the primary phase [Formula: see text] kinetics was faster in men than in women, for both intensities. Nineteen well trained swimmers (8 females mean ± SD; age 17.9 ± 3.5 years; mass 55.2 ± 3.6 kg; height 1.66 ± 0.05 m and 11 male 21.9 ± 2.8 years; 78.2 ± 11.1 kg; 1.81 ± 0.08 m) performed a discontinuous maximal incremental test and two 600-m square wave transitions for both moderate and heavy intensities to determine the [Formula: see text] kinetics parameters using mono- and bi-exponential models, respectively...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28238929/comparison-between-open-and-endovascular-repair-for-the-treatment-of-juxtarenal-abdominal-aortic-aneurysms-a-single-center-experience-with-midterm-results
#14
Koji Maeda, Takao Ohki, Yuji Kanaoka, Takeshi Baba, Kenjirou Kaneko, Kota Shukuzawa
BACKGROUND: To evaluate the optimal treatment for juxtarenal abdominal aortic aneurysm (JAAA), we compared the outcomes of open surgical repair (OSR) with endovascular aortic repair (EVAR) using a variety of fenestrated and snorkel EVARs. METHODS: We evaluated overall survival, aneurysm-related death, reintervention, and renal impairment in 152 JAAAs retrospectively, excluding cases of aortic dissection and rupture. Cox models were used to assess survival and assessed postoperative dialysis rates following surgery...
May 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28238925/early-experience-with-snorkels-and-chimneys-for-expanding-the-indications-for-use-of-endovascular-aneurysm-repair
#15
Mathew Wooster, Bruce Zwiebel, Martin Back, Murray Shames
BACKGROUND: Although fenestrated and branched devices for juxtarenal and paravisceral aneurysms are available worldwide, limited ultrasound availability has perpetuated widespread utilization of adjunctive techniques for the endovascular treatment of these aneurysms. The objective of the study is to report on the technical feasibility and short-term durability of parallel grafts for juxtarenal and paravisceral aneurysms. METHODS: We performed a retrospective review of a prospectively collected endovascular aneurysm repair database, including all patients who underwent a parallel stent procedure...
May 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28167544/nanoliposomal-buparvaquone-immunomodulates-leishmania-infantum-infected-macrophages-and-is-highly-effective-in-a-murine-model
#16
Thais Alves da Costa-Silva, Andrés Jimenez Galisteo, José Angelo Lauletta Lindoso, Leandro R S Barbosa, Andre Gustavo Tempone
Visceral leishmaniasis is a fatal parasitic neglected disease affecting 1.5 million people worldwide. Based on a drug repositioning approach, the aim of this work was to investigate the in vitro immunomodulatory potential of buparvaquone (BPQ) and to establish a safe regimen to evaluate the in vivo efficacy of BPQ entrapped by negatively charged nanoliposomes (BPQ-LP) in Leishmania infantum-infected hamsters. Small-angle X-ray scattering, dynamic light scattering, and the ζ-potential were applied in order to study the influence of BPQ on the liposome structure...
April 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28039527/individual-level-behavioral-responses-of-immature-green-turtles-to-snorkeler-disturbance
#17
Lucas P Griffin, Jacob W Brownscombe, Tyler O Gagné, Alexander D M Wilson, Steven J Cooke, Andy J Danylchuk
Despite many positive benefits of ecotourism, increased human encounters with wildlife may have detrimental effects on wild animals. As charismatic megafauna, nesting and foraging sea turtles are increasingly the focus of ecotourism activities. The purpose of our study was to quantify the behavioral responses of immature green turtles (Chelonia mydas) to disturbance by snorkelers, and to investigate whether turtles have individual-level responses to snorkeler disturbance. Using a standardized disturbance stimulus in the field, we recorded turtle behaviors pre- and post-disturbance by snorkelers...
March 2017: Oecologia
https://www.readbyqxmd.com/read/28007883/evidence-for-amino-acid-snorkeling-from-a-high-resolution-in-vivo-analysis-of-fis1-tail-anchor-insertion-at-the-mitochondrial-outer-membrane
#18
Abdurrahman Keskin, Emel Akdoğan, Cory D Dunn
Proteins localized to mitochondria by a carboxyl-terminal tail anchor (TA) play roles in apoptosis, mitochondrial dynamics, and mitochondrial protein import. To reveal characteristics of TAs that may be important for mitochondrial targeting, we focused our attention upon the TA of the Saccharomyces cerevisiae Fis1 protein. Specifically, we generated a library of Fis1p TA variants fused to the Gal4 transcription factor, then, using next-generation sequencing, revealed which Fis1p TA mutations inhibited membrane insertion and allowed Gal4p activity in the nucleus...
February 2017: Genetics
https://www.readbyqxmd.com/read/27966202/provisional-report-on-diving-related-fatalities-in-australian-waters-in-2011
#19
John Lippmann, Christopher Lawrence, Andrew Fock, Scott Jamieson, Richard Harris
INTRODUCTION: An individual case review of diving-related deaths reported as occurring in Australia in 2011 was conducted as part of the DAN Asia-Pacific dive fatality reporting project. METHOD: The case studies were compiled using reports from witnesses, the police and coroners. In each case, the particular circumstances of the accident and, where available, details from the post-mortem examination are provided. A chain of events analysis was conducted for each case...
December 2016: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://www.readbyqxmd.com/read/27929375/implications-of-the-differing-roles-of-the-%C3%AE-1-and-%C3%AE-3-transmembrane-and-cytoplasmic-domains-for-integrin-function
#20
Zhenwei Lu, Sijo Mathew, Jiang Chen, Arina Hadziselimovic, Riya Palamuttam, Billy G Hudson, Reinhard Fässler, Ambra Pozzi, Charles R Sanders, Roy Zent
Integrins are transmembrane receptors composed of α and β subunits. Although most integrins contain β1, canonical activation mechanisms are based on studies of the platelet integrin, αIIbβ3. Its inactive conformation is characterized by the association of the αIIb transmembrane and cytosolic domain (TM/CT) with a tilted β3 TM/CT that leads to activation when disrupted. We show significant structural differences between β1 and β3 TM/CT in bicelles. Moreover, the 'snorkeling' lysine at the TM/CT interface of β subunits, previously proposed to regulate αIIbβ3 activation by ion pairing with nearby lipids, plays opposite roles in β1 and β3 integrin function and in neither case is responsible for TM tilt...
December 8, 2016: ELife
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