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https://www.readbyqxmd.com/read/28323482/constraints-on-the-early-terrestrial-surface-uv-environment-relevant-to-prebiotic-chemistry
#1
Sukrit Ranjan, Dimitar D Sasselov
The UV environment is a key boundary condition to abiogenesis. However, considerable uncertainty exists as to planetary conditions and hence surface UV at abiogenesis. Here, we present two-stream multilayer clear-sky calculations of the UV surface radiance on Earth at 3.9 Ga to constrain the UV surface fluence as a function of albedo, solar zenith angle (SZA), and atmospheric composition. Variation in albedo and latitude (through SZA) can affect maximum photoreaction rates by a factor of >10.4; for the same atmosphere, photoreactions can proceed an order of magnitude faster at the equator of a snowball Earth than at the poles of a warmer world...
March 2017: Astrobiology
https://www.readbyqxmd.com/read/28285957/comparison-of-renal-outcomes-in-patients-treated-by-zenith-%C3%A2-fenestrated-and-zenith-%C3%A2-abdominal-aortic-aneurysm-stent-grafts-in-us-prospective-pivotal-trials
#2
L R de Souza, G S Oderich, M A Farber, S Haulon, P V Banga, A H Pereira, P Gloviczki, S C Textor, F Jia
OBJECTIVE/BACKGROUND: Fenestrated endovascular repair (FEVAR) has been used to treat complex abdominal aortic aneurysms (AAAs). The risk of renal function deterioration compared with infrarenal endovascular aortic repair (EVAR) has not been determined. METHODS: Patients with preserved renal function (estimated glomerular filtration rate [eGFR] > 45 mL/minute) enrolled in two prospective, non-randomised studies evaluating Zenith fenestrated and AAA stent grafts were matched (1:2) by propensity scores for age, sex, hypertension, diabetes, and pre-operative eGFR...
March 10, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28279653/comparison-of-renal-complications-between-endografts-with-suprarenal-and-infrarenal-fixation
#3
S L Zettervall, P A Soden, S E Deery, K Ultee, K E Shean, F Shuja, R L Amdur, M L Schermerhorn
OBJECTIVES: Surgeons have multiple grafts options available for the endovascular treatment of abdominal aortic aneurysm (EVAR), and some hypothesize that suprarenal fixation endografts may result in higher rates of renal complications than infrarenal endografts. This study aimed to compare the outcomes of contemporary suprarenal and infrarenal endografts. METHODS: The Targeted Vascular Module of the National Surgical Quality Improvement Project was utilised to identify patients undergoing EVAR for infrarenal aneurysm from 2011 to 2013...
March 6, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28262714/size-resolved-pb-distribution-in-the-athabasca-river-shows-snowmelt-in-the-bituminous-sands-region-an-insignificant-source-of-dissolved-pb
#4
Muhammad Babar Javed, Chad W Cuss, Iain Grant-Weaver, William Shotyk
Lead (Pb) is a metal of special importance because of its long history of commercial and industrial use, global atmospheric contamination accelerated by the use of gasoline additives, and health effects, with children being especially vulnerable. Global atmospheric Pb pollution reached its zenith in the 1970's, but subsequent impacts on freshwater aquatic systems are poorly understood. Employing metal-free sampling and handling protocols, we show that snowmelt from the Athabasca bituminous sands region is an insignificant source of dissolved Pb to the Athabasca River (AR)...
March 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28260186/efficacy-of-zofenopril-vs-irbesartan-in-combination-with-a-thiazide-diuretic-in-hypertensive-patients-with-multiple-risk-factors-not-controlled-by-a-previous-monotherapy-a-review-of-the-double-blind-randomized-z-studies
#5
REVIEW
Stefano Omboni, Ettore Malacco, Claudio Napoli, Pietro Amedeo Modesti, Athanasios Manolis, Gianfranco Parati, Enrico Agabiti-Rosei, Claudio Borghi
Combinations between an angiotensin converting enzyme (ACE) inhibitor or an angiotensin II receptor blocker (ARB) and hydrochlorothiazide (HCTZ) are among the recommended treatments for hypertensive patients uncontrolled by monotherapy. Four randomized, double-blind, parallel group studies with a similar design, including 1469 hypertensive patients uncontrolled by a previous monotherapy and with ≥1 cardiovascular risk factor, compared the efficacy of a combination of a sulfhydryl ACE inhibitor (zofenopril at 30 or 60 mg) or an ARB (irbesartan at 150 or 300 mg) plus HCTZ 12...
March 4, 2017: Advances in Therapy
https://www.readbyqxmd.com/read/28254395/trends-in-use-of-the-only-food-and-drug-administration-approved-commercially-available-fenestrated-endovascular-aneurysm-repair-device-in-the-united-states
#6
Jessica P Simons, Bing Shue, Julie M Flahive, Francesco A Aiello, Robert C Steppacher, Elizabeth A Eaton, Louis M Messina, Andres Schanzer
BACKGROUND: Fenestrated endografts are customized, patient-specific, endovascular devices with potential to significantly reduce morbidity and mortality of short-neck infrarenal and juxtarenal abdominal aortic aneurysm repair. The Zenith fenestrated endovascular graft (ZFEN) for abdominal aortic aneurysms (Cook Medical, Bloomington, Ind), Food and Drug Administration-approved in 2012, remains the only fenestrated device available in the United States. This technology is among the most technically complex catheter-based procedures and, therefore, inherently associated with serious risk for device-related complications...
February 19, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28253188/clinical-assessment-of-the-gingival-contours-and-proximal-contact-areas-in-the-maxillary-anterior-dentition
#7
Ranganath Venugopal, Arshia Zainab A Jameel Ahmed, Ashish S Nichani
Gingival display has been identified as a critical element in a beautiful smile and thus in facial esthetics. The present study aimed to assess the gingival line angle (GLA); the distance between the gingival zenith of maxillary lateral incisor and the gingival line (LID); and the ratio between the height of the proximal contact area (PCA) and crown length, referred to as the proximal contact area proportion (PCAP). Fifty patients, aged 21-30 years, were recruited for study. Maxillary impressions were made using irreversible hydrocolloid and poured in dental stone, and facebow records were used to mount the master casts in an articulator...
March 2017: General Dentistry
https://www.readbyqxmd.com/read/28249820/the-impact-of-aortic-tortuosity-on-delayed-type-i-or-iii-endoleak-after-endovascular-aortic-repair
#8
Po-Lin Chen, Hung-Lung Hsu, I-Ming Chen, Yin-Yin Chen, Kuei-Yi Chou, Tzu-Ting Kuo, Chun-Che Shih
OBJECTIVE: Endovascular aneurysm repair (EVAR) becomes the treatment of choice for patients with abdominal aortic aneurysm (AAA). Type I or III endoleak is related to high risk of rupture and reintervention but little is known about the delayed presentation of these. We sought to evaluate the delayed type I or III endoleak after EVAR and assess the early morphological portending factors. METHODS: We retrospectively reviewed a database of 249 patients who underwent endovascular repair with a Zenith AAA stent graft (Cook Medical, Bloomington, Ind) in a single institute from October 2005 to December 2013...
February 26, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28249242/phytofabricated-gold-nanoparticles-and-their-biomedical-applications
#9
REVIEW
Bashir Ahmad, Nabia Hafeez, Shumaila Bashir, Abdur Rauf, Mujeeb-Ur-Rehman
In a couple of decades, nanotechnology has become a trending technology owing to its integrated science collection that incorporates variety of fields such as chemistry, physics, medicine, catalytic processes, food processing industries, electronics and energy sectors. One of the emerging fields of nanotechnology that has gained momentous admiration is nano-biotechnology. Nano-biotechnology is an integrated combination of biology with nanotechnology that encompasses the tailoring, and synthesis of small particles that are less than 100nm in size and subsequent exploitation of these particles for their biological applications...
February 26, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28245932/characterisation-of-a-smartphone-image-sensor-response-to-direct-solar-305nm-irradiation-at-high-air-masses
#10
D P Igoe, A Amar, A V Parisi, J Turner
This research reports the first time the sensitivity, properties and response of a smartphone image sensor that has been used to characterise the photobiologically important direct UVB solar irradiances at 305nm in clear sky conditions at high air masses. Solar images taken from Autumn to Spring were analysed using a custom Python script, written to develop and apply an adaptive threshold to mitigate the effects of both noise and hot-pixel aberrations in the images. The images were taken in an unobstructed area, observing from a solar zenith angle as high as 84° (air mass=9...
February 25, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28241661/spectral-sea-surface-reflectance-of-skylight
#11
Xiaodong Zhang, Shuangyan He, Afshin Shabani, Peng-Wang Zhai, Keping Du
In examining the dependence of the sea surface reflectance of skylight ρs on sky conditions, wind speed, solar zenith angle, and viewing geometry, Mobley [Appl. Opt.38, 7442 (1999).10.1364/AO.38.007442] assumed ρs is independent of wavelength. Lee et al. [Opt. Express18, 26313 (2010).10.1364/OE.18.026313] showed experimentally that ρs does vary spectrally due to the spectral difference of sky radiance coming from different directions, which was ignored in Mobley's study. We simulated ρs from 350 nm to 1000 nm by explicitly accounting for spectral variations of skylight distribution and Fresnel reflectance...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28241466/lightdrum-portable-light-stage-for-accurate-btf-measurement-on-site
#12
Vlastimil Havran, Jan Hošek, Šárka Němcová, Jiří Čáp, Jiří Bittner
We propose a miniaturised light stage for measuring the bidirectional reflectance distribution function (BRDF) and the bidirectional texture function (BTF) of surfaces on site in real world application scenarios. The main principle of our lightweight BTF acquisition gantry is a compact hemispherical skeleton with cameras along the meridian and with light emitting diode (LED) modules shining light onto a sample surface. The proposed device is portable and achieves a high speed of measurement while maintaining high degree of accuracy...
February 23, 2017: Sensors
https://www.readbyqxmd.com/read/28238918/zenith-bifurcated-iliac-side-branch-device-mid-term-results-and-assessment-of-risk-factors-for-intraoperative-thrombosis
#13
Charline Delay, Sébastien Deglise, Anne Lejay, Yannick Georg, Mathieu Roussin, Mickaël Schaeffer, François Saucy, Fabien Thaveau, Jean-Marc Corpataux, Nabil Chakfe
INTRODUCTION: The aim of this study was to evaluate the short- and mid-term results of the Zenith bifurcated iliac side branch device (ZBIS) in the treatment of common iliac artery (CIA) aneurysms, and to assess risk factors for intraoperative internal iliac artery (IIA) thrombosis. MATERIALS AND METHODS: All patients who underwent endovascular treatment of either an isolated CIA aneurysm or an aorto-iliac aneurysm using the ZBIS device in the departments of vascular surgery of Strasbourg (France) and Lausanne (Switzerland) between January 2010 and December 2014 were retrospectively collected...
February 23, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/28222363/very-short-term-reactive-forecasting-of-the-solar-ultraviolet-index-using-an-extreme-learning-machine-integrated-with-the-solar-zenith-angle
#14
Ravinesh C Deo, Nathan Downs, Alfio V Parisi, Jan F Adamowski, John M Quilty
Exposure to erythemally-effective solar ultraviolet radiation (UVR) that contributes to malignant keratinocyte cancers and associated health-risk is best mitigated through innovative decision-support systems, with global solar UV index (UVI) forecast necessary to inform real-time sun-protection behaviour recommendations. It follows that the UVI forecasting models are useful tools for such decision-making. In this study, a model for computationally-efficient data-driven forecasting of diffuse and global very short-term reactive (VSTR) (10-min lead-time) UVI, enhanced by drawing on the solar zenith angle (θs) data, was developed using an extreme learning machine (ELM) algorithm...
May 2017: Environmental Research
https://www.readbyqxmd.com/read/28221156/-microperc-fashion-or-reality
#15
Marcos Cepeda, José H Amón
Miniaturization in percutaneous surgery has seen its zenith in microperc. Technological advances have enabled us to treat renal lithiasis through a 4.8 Ch. caliper percutaneous access. According to published literature, the technique is reproducible and when applied to small and medium size renal lithiasis has a high success rate keepin a low complication rate. Its main advantage is the absence of tract dilatation, diminishing the bleeding risk inherent to percutaneous access, postoperative pain and hospital stay...
January 2017: Archivos Españoles de Urología
https://www.readbyqxmd.com/read/28216363/durable-outcomes-of-thoracic-endovascular-aortic-repair-with-zenith-tx1-and-tx2-devices
#16
Jocelyn M Beach, Yuki Kuramochi, Corey Brier, Eric E Roselli, Matthew J Eagleton
OBJECTIVE: Long-term data regarding the safety and durability of thoracic endovascular aortic repair (TEVAR) are limited. The study objective was to evaluate the long-term outcomes of TEVAR in high-risk patients with descending thoracic aortic pathology. METHODS: High-risk patients were treated with thoracic endografts (2001-2011) under a prospective, physician-sponsored, investigational device exemption trial. Three-dimensional reconstructions and measurements were performed on computed tomography scans acquired before discharge, at 1, 6, and 12 months, and then yearly thereafter...
February 16, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28216359/fenestrated-endovascular-aneurysm-repair-among-octogenarians-at-high-and-standard-risk-for-open-repair
#17
David E Timaran, Martyn Knowles, Tarik Ali, Carlos H Timaran
BACKGROUND: Octogenarians with complex abdominal aortic aneurysms are at higher risk of death and morbidity after open repair. Fenestrated endovascular aneurysm repair (FEVAR) is an alternative to open repair for high-risk patients, such as octogenarians. The aim of this study was to evaluate perioperative and midterm outcomes of FEVAR among octogenarians at high and standard risk for open repair. METHODS: During a 2-year period, 85 patients (68 men [78%] and 17 women [22%]) underwent FEVAR using Zenith (Cook Medical, Bloomington, Ind) Fenestrated AAA Endovascular Grafts (70%), Zenith p-Branch (7%), and fenestrated custom-made devices (22%)...
February 16, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28216344/perioperative-outcome-of-endovascular-repair-for-complex-abdominal-aortic-aneurysms
#18
Klaas H J Ultee, Sara L Zettervall, Peter A Soden, Jeremy Darling, Hence J M Verhagen, Marc L Schermerhorn
BACKGROUND: As endovascular aneurysm repair (EVAR) continues to advance, eligibility of patients with anatomically complex abdominal aortic aneurysms (AAAs) for EVAR is increasing. However, whether complex EVAR is associated with favorable outcome over conventional open repair and how outcomes compare with infrarenal EVAR remains unclear. This study examined perioperative outcomes of patients undergoing complex EVAR, focusing on differences with complex open repair and standard infrarenal EVAR...
February 16, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28193823/stellar-performance-mechanisms-underlying-milky-way-orientation-in-dung-beetles
#19
James J Foster, Basil El Jundi, Jochen Smolka, Lana Khaldy, Dan-Eric Nilsson, Marcus J Byrne, Marie Dacke
Nocturnal dung beetles (Scarabaeus satyrus) are currently the only animals that have been demonstrated to use the Milky Way for reliable orientation. In this study, we tested the capacity of S. satyrus to orient under a range of artificial celestial cues, and compared the properties of these cues with images of the Milky Way simulated for a beetle's visual system. We find that the mechanism that permits accurate stellar orientation under the Milky Way is based on an intensity comparison between different regions of the Milky Way...
April 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28166072/gender-based-comparison-of-gingival-zenith-esthetics
#20
M Humagain, D Rokaya, R Srii, S Dixit, D Kafle
Background The size, proportion and gingival zenith position of maxillary anterior teeth plays in the anterior teeth esthetics. Objective To compare the gingival zenith positions and levels between male and female in right and left side as an esthetic parameter. Method Impression of the maxillary arch was made in each participant with irreversible hydrocolloid, and dental cast was made with dental stone type IV. Two clinical parameters were evaluated: (1) the gingival zenith position (GZP) from the vertical bisected midline along the long axis of each individual maxillary anterior tooth; and (2) the gingival zenith level (GZL) of the lateral incisors in an apical-coronal direction relative to the gingival line joining the tangents of the GZP of the adjacent central incisor and canine teeth under healthy conditions...
April 2016: Kathmandu University Medical Journal (KUMJ)
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