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Margaret W Miller, Katryna Kerr, Dana E Williams
Since the listing of Acropora palmata and A. cervicornis under the US Endangered Species Act in 2006, increasing investments have been made in propagation of listed corals (primarily A. cervicornis, A. palmata to a much lesser extent) in offshore coral nurseries and outplanting cultured fragments to reef habitats. This investment is superimposed over a spatiotemporal patchwork of ongoing disturbances (especially storms, thermal bleaching, and disease) as well as the potential for natural population recovery...
2016: PeerJ
Karin Öjemalm, Takashi Higuchi, Patricia Lara, Erik Lindahl, Hiroaki Suga, Gunnar von Heijne
Cotranslational translocon-mediated insertion of membrane proteins into the endoplasmic reticulum is a key process in membrane protein biogenesis. Although the mechanism is understood in outline, quantitative data on the energetics of the process is scarce. Here, we have measured the effect on membrane integration efficiency of nonproteinogenic analogs of the positively charged amino acids arginine and lysine incorporated into model transmembrane segments. We provide estimates of the influence on the apparent free energy of membrane integration (ΔGapp) of "snorkeling" of charged amino acids toward the lipid-water interface, and of charge neutralization...
September 20, 2016: Proceedings of the National Academy of Sciences of the United States of America
S W K Cheng
Endovascular repair has evolved to become a viable mainstream treatment for aortic pathology in both acute and elective settings. As technology advanced, traditional anatomical barriers were progressively tackled using new devices and novel procedures, and there are now multiple options available to the vascular surgeon. In the abdominal aorta, advances in endovascular aneurysm repair have been in the treatment of hostile aortic necks using new sealing concepts and ancillary procedures, and in branch preservation using fenestrations and snorkels...
September 2016: British Journal of Anaesthesia
Anne E Kirkbride-Smith, Philip M Wheeler, Magnus L Johnson
Artificial reefs in marine protected areas provide additional habitat for biodiversity viewing, and therefore may offer an innovative management solution for managing for coral reef recovery and resilience. Marine park user fees can generate revenue to help manage and maintain natural and artificial reefs. Using a stated preference survey, this study investigates the present consumer surplus associated with visitor use of a marine protected area in Barbados. Two hypothetical markets were presented to differentiate between respondents use values of either: (a) natural reefs within the marine reserve or (b) artificial reef habitat for recreational enhancement...
2016: PeerJ
Maral Ouzounian, Francois Dagenais
No abstract text is available yet for this article.
October 2016: Journal of Thoracic and Cardiovascular Surgery
George W Williams, Christy A George, Brian C Harvey, Jenny E Freeman
BACKGROUND: Current respiratory monitoring technologies such as pulse oximetry and capnography have been insufficient to identify early signs of respiratory compromise in nonintubated patients. Pulse oximetry, when used appropriately, will alert the caregiver to an episode of dangerous hypoxemia. However, desaturation lags significantly behind hypoventilation and alarm fatigue due to false alarms poses an additional problem. Capnography, which measures end-tidal CO2 (EtCO2) and respiratory rate (RR), has not been universally used for nonintubated patients for multiple reasons, including the inability to reliably relate EtCO2 to the level of impending respiratory compromise and lack of patient compliance...
July 5, 2016: Anesthesia and Analgesia
Pierre Louge, Mathieu Coulange, Frederic Beneton, Emmanuel Gempp, Olivier Le Pennetier, Maxime Algoud, Lorene Dubourg, Pierre Naibo, Marion Marlinge, Pierre Michelet, Donato Vairo, Nathalie Kipson, François Kerbaul, Yves Jammes, Ian M Jones, Jean-Guillaume Steinberg, Jean Ruf, Régis Guieu, Alain Boussuges, Emmanuel Fenouillet
Immersion pulmonary edema (IPE) is a misdiagnosed environmental illness caused by water immersion, cold, and exertion. IPE occurs typically during SCUBA diving, snorkeling, and swimming. IPE is sometimes associated with myocardial injury and/or loss of consciousness in water, which may be fatal. IPE is thought to involve hemodynamic and cardiovascular disturbances, but its pathophysiology remains largely unclear, which makes IPE prevention difficult. This observational study aimed to document IPE pathogenesis and improve diagnostic reliability, including distinguishing in some conditions IPE from decompression sickness (DCS), another diving-related disorder...
June 2016: Medicine (Baltimore)
C Jaco Klok, Alexander Kaiser, John J Socha, Wah-Keat Lee, Jon F Harrison
Insects are small relative to vertebrates, and were larger in the Paleozoic when atmospheric oxygen levels were higher. The safety margin for oxygen delivery does not increase in larger insects, due to an increased mass-specific investment in the tracheal system and a greater use of convection in larger insects. Prior studies have shown that the dimensions and number of tracheal system branches varies inversely with rearing oxygen in embryonic and larval insects. Here we tested whether rearing in 10, 21, or 40 kPa atmospheric oxygen atmospheres for 5-7 generations affected the tracheal dimensions and diffusing capacities of pupal and adult Drosophila...
2016: Advances in Experimental Medicine and Biology
Carl Edmonds
The evolution of scuba divers pulmonary edema is described. When discovered in 1981, it was believed to be a cold-induced response in a submerged, otherwise healthy, scuba diver. The clinical features are described and discussed, as are the demographics. An alleged prevalence of 1.1% was complicated by problematic statistics and an apparent increase in reported cases. Recurrences both while diving and swimming or snorkeling were common. More recent case reports and surveys are described, identifying predisposing factors and associations, including cardiac pathology...
March 2016: Undersea & Hyperbaric Medicine: Journal of the Undersea and Hyperbaric Medical Society, Inc
Diego Chaverri, Xavier Iglesias, Thorsten Schuller, Uwe Hoffmann, Ferran A Rodríguez
To assess the validity of postexercise measurements in estimating peak oxygen uptake (V̇O2peak) in swimming, we compared oxygen uptake (V̇O2) measurements during supramaximal exercise with various commonly adopted methods, including a recently developed heart rate - V̇O2 modelling procedure. Thirty-one elite swimmers performed a 200-m maximal swim where V̇O2 was measured breath-by-breath using a portable gas analyzer connected to a respiratory snorkel, 1 min before, during, and 3 min postexercise. V̇O2peak(-20-0) was the average of the last 20 s of effort...
June 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
Vincent Raoult, Peter A David, Sally F Dupont, Ciaran P Mathewson, Samuel J O'Neill, Nicholas N Powell, Jane E Williamson
Citizen science can increase the scope of research in the marine environment; however, it suffers from necessitating specialized training and simplified methodologies that reduce research output. This paper presents a simplified, novel survey methodology for citizen scientists, which combines GoPro imagery and structure from motion to construct an ortho-corrected 3D model of habitats for analysis. Results using a coral reef habitat were compared to surveys conducted with traditional snorkelling methods for benthic cover, holothurian counts, and coral health...
2016: PeerJ
Daniel J Howard, Richard K Grosberg, Mohamed A F Noor, Benjamin B Normark, David M Rand, Kerry L Shaw, Christopher S Willett
Richard G. Harrison passed away unexpectedly on April 12th, 2016. In this memoriam we pay tribute to the life and legacy of an extraordinary scientist, mentor, friend, husband, and father.
June 2016: Molecular Ecology
Jason Faulds, Harleen K Sandhu, Anthony L Estrera, Hazim J Safi
The cumulative experience with endovascular aortic repair in the descending thoracic and infrarenal aorta has led to increased interest in endovascular aortic arch reconstruction. Open total arch replacement is a robust operation that can be performed with excellent results. However, it requires cardiopulmonary bypass and circulatory arrest and, therefore, may not be tolerated by all patients. Minimally invasive techniques have been considered as an alternative and include hybrid arch debranching, parallel stent graft deployment in the chimney and snorkel configurations, and complete endovascular branched reconstruction with multi-branched devices...
January 2016: Methodist DeBakey Cardiovascular Journal
Stevo Duvnjak
Approximately 20%-40% of patients with abdominal aortic aneurysms can have unilateral or bilateral iliac artery aneurysms and/or ectasia. This influences and compromises the distal sealing zone during endovascular aneurysm repair. There are a few endovascular techniques that are used to treat these types of aneurysms, including intentional occlusion/over-stenting of the internal iliac artery on one or both sides, the "bell-bottom" technique, and the more recent method of using an iliac branch stent graft. In some cases, other options include the "snorkel and sandwich" technique and hybrid interventions...
March 28, 2016: World Journal of Radiology
George S Georgiadis, Joost A van Herwaarden, George A Antoniou, Athanasios D Giannoukas, Miltos K Lazarides, Frans L Moll
The introduction of fenestrated stent grafts (SGs) to treat abdominal aortic aneurysms (AAAs) with short proximal necks began in 1999. Nowadays, the whole visceral aorta can be treated totally by endovascular means. The established use of fenestrated devices to treat complex AAAs as a first-line management option has been previously reported. An up-to-date evaluation of the literature was performed including all types of publications regarding the use of fenestrated technology to repair complex AAAs. Fenestrated repair is now an established alternative to hybrid/chimney/snorkel repairs...
June 2016: Vascular Medicine
Bernardo C Mendes, Gustavo S Oderich, Leonardo Reis de Souza, Peter Banga, Thanila A Macedo, Randall R DeMartino, Sanjay Misra, Peter Gloviczki
OBJECTIVE: This study evaluated renal artery (RA) and accessory renal artery (ARA) anatomy and implications for endovascular repair using fenestrated, branched, or parallel (chimney, snorkel, and periscope) stent graft techniques. METHODS: We analyzed the digital computed tomography angiograms of 520 consecutive patients treated by open or fenestrated endovascular repair for complex abdominal aortic aneurysms (2000-2012). RA/ARA anatomy was assessed using diameter, length, angles, and kidney perfusion based on analysis of estimated volumetric kidney parenchyma...
May 2016: Journal of Vascular Surgery
A R Naylor, T L Forbes
No abstract text is available yet for this article.
November 2015: European Journal of Vascular and Endovascular Surgery
A R Naylor, T L Forbes
No abstract text is available yet for this article.
November 2015: European Journal of Vascular and Endovascular Surgery
Sun Young Woo, Hwankyu Lee
Peptides E and K, which are synthetic coiled-coil peptides for membrane fusion, were simulated with lipid bilayers composed of lipids and cholesterols at different ratios using all-atom models. We first calculated free energies of binding from umbrella sampling simulations, showing that both E and K peptides tend to adsorb onto the bilayer surface, which occurs more strongly in the bilayer composed of smaller lipid headgroups. Then, unrestrained simulations show that K peptides more deeply insert into the bilayer with partially retaining the helical structure, while E peptides less insert and predominantly become random coils, indicating the structural transition from helices to random coils, in quantitative agreement with experiments...
2016: Scientific Reports
(no author information available yet)
No abstract text is available yet for this article.
February 2016: PLoS Computational Biology
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