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https://www.readbyqxmd.com/read/28445647/how-will-copper-contamination-constrain-future-global-steel-recycling
#1
Katrin Ellen Daehn, Andre Cabrera Serrenho, Julian M Allwood
Copper in steel causes metallurgical problems, but is pervasive in end-of-life scrap and cannot currently be removed commercially once in the melt. Contamination can be managed to an extent by globally trading scrap for use in tolerant applications and dilution with primary iron sources. However, the viability of long-term strategies can only be evaluated with a complete characterization of copper in the global steel system and this is presented in this paper. The copper concentration of flows along the 2008 steel supply chain is estimated from a survey of literature data and compared with estimates of the maximum concentration that can be tolerated in steel products...
April 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28445544/pressure-flaking-to-serrate-bifacial-points-for-the-hunt-during-the-mis5-at-sibudu-cave-south-africa
#2
Veerle Rots, Carol Lentfer, Viola C Schmid, Guillaume Porraz, Nicholas J Conard
Projectile technology is considered to appear early in the southern African Middle Stone Age (MSA) and the rich and high resolution MSA sequence of Sibudu Cave in KwaZulu-Natal has provided many new insights about the use and hafting of various projectile forms. We present the results of a functional and technological analysis on a series of unpublished serrated bifacial points recently recovered from the basal deposits of Sibudu Cave. These serrated tools, which only find equivalents in the neighbouring site of Umhlatuzana, precede the Still Bay techno-complex and are older than 77 ka BP...
2017: PloS One
https://www.readbyqxmd.com/read/28445542/no-touch-radiofrequency-ablation-using-multiple-electrodes-an-in-vivo-comparison-study-of-switching-monopolar-versus-switching-bipolar-modes-in-porcine-livers
#3
Won Chang, Jeong Min Lee, Jeong Hee Yoon, Dong Ho Lee, Sang Min Lee, Kyoung Bun Lee, Bo Ram Kim, Tae-Hyung Kim, Seunghyun Lee, Joon Koo Han
OBJECTIVE: To evaluate the in vivo technical feasibility, efficiency, and safety of switching bipolar (SB) and switching monopolar (SM) radiofrequency ablation (RFA) as a no-touch ablation technique in the porcine liver. MATERIALS AND METHODS: The animal care and use committee approved this animal study and 16 pigs were used in two independent experiments. In the first experiment, RFA was performed on 2-cm tumor mimickers in the liver using a no-touch technique in the SM mode (2 groups, SM1: 10 minutes, n = 10; SM2: 15 minutes, n = 10) and SB-mode (1 group, SB: 10 minutes, n = 10)...
2017: PloS One
https://www.readbyqxmd.com/read/28445358/discussion-the-challenges-of-augmentation-mastopexy-in-the-massive-weight-loss-patient-technical-considerations
#4
Bernard L Markowitz
No abstract text is available yet for this article.
May 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28445357/the-challenges-of-augmentation-mastopexy-in-the-massive-weight-loss-patient-technical-considerations
#5
Demetrius M Coombs, Udayan Srivastava, Dalit Amar, J Peter Rubin, Jeffrey A Gusenoff
BACKGROUND: Augmentation mastopexy in the massive weight loss population is challenging because of poor skin elasticity and lack of inframammary support. Despite several large studies of augmentation mastopexy in the literature, few data exist regarding this unique patient population. The authors examine early postoperative ptosis, implant malposition, and strategies to optimize outcomes. METHODS: A retrospective review of massive weight loss patients who underwent augmentation mastopexy from 2003 to 2011 was performed to record age, body mass index, implant characteristics, postoperative ptosis, and implant malposition...
May 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28445196/the-use-of-a-fresh-tissue-cadaver-model-for-the-instruction-of-dermatological-procedures-a-laboratory-study-for-training-medical-students
#6
Jose A Cervantes, Collin M Costello, Melody Maarouf, Hilary C McCrary, Nathalie C Zeitouni
BACKGROUND: A realistic model for the instruction of basic dermatologic procedural skills was developed, while simultaneously increasing medical student exposure to the field of dermatology. OBJECTIVE: The primary purpose of the authors' study was to evaluate the utilization of a fresh-tissue cadaver model (FTCM) as a method for the instruction of common dermatologic procedures. The authors' secondary aim was to assess students' perceived clinical skills and overall perception of the field of dermatology after the lab...
April 24, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28445162/binostril-endoscopic-transsphenoidal-neurosurgery-for-pituitary-adenomas-experience-with-42-patients
#7
Guan Sun, Ying Cao, Nan Jiang, Dekang Nie, Zhengqiang Wan, Min Li, Chiyuan Ma, Jun Guo
Here we review the technical aspects of our experience with the neuroendoscopic bilateral nostril (binostril) transsphenoidal approach for pituitary adenomas. A total of 42 patients were treated in our hospital from September 2013 to December 2015. Total tumor resection was completed in 31 cases, nearly full resection was achieved in 9 cases, and partial resection was achieved in 2 cases. In most cases clinical symptoms were relieved after surgery. These included 18/22 cases with visual field and vision disorders; 19/25 cases with headaches; 11/15 cases where high baseline PRL returned to normal levels; 6/7 cases where elevated blood GH returned to normal levels; and 2/3 cases where elevated blood ACTH returned to normal levels after surgery...
April 9, 2017: Oncotarget
https://www.readbyqxmd.com/read/28445051/potential-air-pollutant-emissions-and-permitting-classifications-for-two-biorefinery-process-designs-in-the-united-states
#8
Annika Eberle, Arpit Bhatt, Yimin Zhang, Garvin A Heath
Advanced biofuel production facilities (biorefineries), such as those envisioned by the United States (U.S.) Renewable Fuel Standard and U.S. Department of Energy's research and development programs, often lack historical air pollutant emissions data, which can pose challenges for obtaining air emission permits that are required for construction and operation. To help fill this knowledge gap, we perform a thorough regulatory analysis and use engineering process designs to assess the applicability of federal air regulations and quantify air pollutant emissions for two feasibility-level biorefinery designs...
April 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28444570/current-mitraclip-experience-safety-and-feasibility-in-the-netherlands
#9
Z Rahhab, F A Kortlandt, J F Velu, R A J Schurer, V Delgado, P Tonino, A J Boven, B J L Van den Branden, A O Kraaijeveld, M Voskuil, J Hoorntje, M van Wely, K van Houwelingen, G B Bleeker, B Rensing, I Kardys, J Baan, J A S Van der Heyden, N M Van Mieghem
PURPOSE: Data on MitraClip procedural safety and efficacy in the Netherlands are scarce. We aim to provide an overview of the Dutch MitraClip experience. METHODS: We pooled anonymised demographic and procedural data of 1151 consecutive MitraClip patients, from 13 Dutch hospitals. Data was collected by product specialists in collaboration with local operators. Effect on mitral regurgitation was intra-procedurally assessed by transoesophageal echocardiography. Technical success and device success were defined according to modified definitions of the Mitral Valve Academic Research Consortium (MVARC)...
April 25, 2017: Netherlands Heart Journal
https://www.readbyqxmd.com/read/28444558/evolution-of-surgical-treatment-for-rectal-cancer-a-review
#10
Sanjeev Dayal, Nick Battersby, Tom Cecil
Surgery that produces an optimal total mesorectal excision (TME) resection specimen remains the cornerstone of curative rectal cancer management. In the modern era, despite the results of recent randomised trials, laparoscopic TME is a crucial technique in the TME surgery armamentarium. Laparoscopic surgery offers the benefit of magnified views that aid sharp and precise dissection. However operating in the confines of a narrow pelvis, particularly when the mesorectum is bulky, requires significant technical skill...
April 25, 2017: Journal of Gastrointestinal Surgery: Official Journal of the Society for Surgery of the Alimentary Tract
https://www.readbyqxmd.com/read/28444497/evaluation-of-crowd-sourced-assessment-of-the-critical-view-of-safety-in-laparoscopic-cholecystectomy
#11
Shanley B Deal, Dimitrios Stefanidis, Dana Telem, Robert D Fanelli, Marian McDonald, Michael Ujiki, L Michael Brunt, Adnan A Alseidi
BACKGROUND: Faculty experts (FE) and crowd workers (CW) can assess technical skill, but assessment of operative technique has not been explored. We sought to evaluate if CW could be taught to assess completion of the critical view of safety (CVS) in laparoscopic cholecystectomy. METHODS: We prepared 160 blinded, surgical videos of laparoscopic cholecystectomy from public domain websites. Videos were edited to ≤60 s, ending when a structure was cut/clipped. CW analyzed videos using Global Objective Assessment of Laparoscopic Skills (GOALS) and CVS criteria assessment tools after watching an instructional tutorial...
April 25, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28444495/establishing-meaningful-benchmarks-the-development-of-a-formative-feedback-tool-for-advanced-laparoscopic-suturing
#12
Katherine M McKendy, Yusuke Watanabe, Elif Bilgic, Ghada Enani, Amani Munshi, Lawrence Lee, Liane S Feldman, Gerald M Fried, Melina C Vassiliou
BACKGROUND: Time and accuracy are commonly used metrics to assess laparoscopic skills in a simulated environment. However, they do not provide trainees with meaningful information about how to improve their skills. The objective of this study was to provide preliminary validity evidence for the creation a formative feedback tool (FFT) for advanced laparoscopic suturing skills. METHODS: Videotapes of senior surgical residents (PGY3-5; SRs) and minimally invasive surgeons (MIS) performing 3 advanced laparoscopic suturing tasks were analyzed: needle handling (NH), suturing under tension (UT), and continuous suturing (CS)...
April 25, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28444372/quantifying-the-number-of-independent-organelle-dna-insertions-in-genome-evolution-and-human-health
#13
Einat Hazkani-Covo, William F Martin
Fragments of organelle genomes are often found as insertions in nuclear DNA. These fragments of mitochondrial DNA (numts) and plastid DNA (nupts) are ubiquitous components of eukaryotic genomes. They are, however, often edited out during the genome assembly process, leading to systematic underestimation of their frequency. Numts and nupts, once inserted, can become further fragmented through subsequent insertion of mobile elements or other recombinational events that disrupt the continuity of the inserted sequence relative to the genuine organelle DNA copy...
April 21, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28444247/exposure-parameters-of-mammograms-with-and-without-mass-lesions-from-a-south-african-breast-care-centre
#14
Sussan N Acho, Willem P E Boonzaier, Ina F Nel
In South African breast care centres, full-field digital mammography units provide breast imaging services to symptomatic and asymptomatic women simultaneously. This study evaluated the technical exposure parameters of 800 mammograms of which 100 mammograms had obvious mass lesions in the fibroglandular tissue. The average breast compression force of mammograms with mass lesions in the fibroglandular tissue was 18.4% less than the average breast compression force of mammograms without mass lesions. The average mean glandular dose (MGD), tube potential (kVp) and compressed breast thickness (CBT) values were 2...
April 24, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28444053/a-systematic-review-of-the-process-of-regionalization-of-brazil-s-unified-health-system-sus
#15
Guilherme Arantes Mello, Ana Paula Chancharulo de Morais Pereira, Liza Yurie Teruya Uchimura, Fabíola Lana Iozzi, Marcelo Marcos Piva Demarzo, Ana Luiza d'Ávila Viana
This review focuses only on specific studies into the SUS regionalization process, which were based on empirical results and published since 2006, when the SUS was already under the aegis of the Pact for Health framework. It was found that the regionalization process is now underway in all spheres of government, subject to a set of challenges common to the different realities of the country. These include, primarily, that committee-structured entities are valued as spaces for innovation, yet also strive to overcome the bureaucratic and clientelist political culture...
April 2017: Ciência & Saúde Coletiva
https://www.readbyqxmd.com/read/28444052/healthcare-regions-and-their-care-networks-an-organizational-systemic-model-for-sus
#16
Lenir Santos
This paper describes a comprehensive effort to develop studies regarding Brazil's Unified Healthcare System (SUS), as a result of the combination of public services in a network that follows a region-based rationale (tripartite organization). The SUS emerges from such an integration and should be organized as such. The intention is to demonstrate that this type of organization is essential, given that Brazil is organized as a Federation, and all three governmental levels are, in a broad sense, equally responsible for healthcare...
April 2017: Ciência & Saúde Coletiva
https://www.readbyqxmd.com/read/28444047/health-regionalization-in-amazonas-progress-and-challenges
#17
Luiza Garnelo, Amandia Braga Lima Sousa, Clayton de Oliveira da Silva
This paper analyses the health services regionalization process in the State of Amazonas through a case study covering the health sub-region Manaus Surroundings. This is a qualitative, descriptive and analytical research, which data were collected using interviews, documents and Internet reviews, oriented by the guiding concept of health regionalization. Study findings revealed a social setting dominated by asymmetry, verticality, competitiveness and fragile multilateral relations among municipalities, associated to a bureaucratic profile of local institutions operating in the region under study...
April 2017: Ciência & Saúde Coletiva
https://www.readbyqxmd.com/read/28443838/charge-detection-mass-spectrometry-weighing-heavier-things
#18
REVIEW
David Z Keifer, Elizabeth E Pierson, Martin F Jarrold
Charge detection mass spectrometry (CDMS) is a single molecule method where the mass of each ion is directly determined from individual measurements of its mass-to-charge ratio and charge. CDMS is particularly valuable for the analysis of high mass and heterogeneous analytes, where conventional MS methods are often confounded. In the last few years, CDMS has received a renaissance. Technical developments have improved the resolution and dramatically increased the breadth of problems that can be addressed. These improvements have moved CDMS more into the mainstream as interest in the application of mass spectrometry to high molecular weight species has grown...
April 26, 2017: Analyst
https://www.readbyqxmd.com/read/28443832/protective-buffering-capacity-of-restorative-dental-materials-in-vitro
#19
Markus Fuss, Michael J Wicht, Thomas Attin, Sonja H M Derman, Michael J Noack
PURPOSE: To investigate the buffering capacity of restorative materials during a simulated carious and intrinsic erosive attack. MATERIALS AND METHODS: Cavities with a volume of 130 μl were milled (Cerec MC XL) out of blocks of Ceram X Mono (CM), Quixfil (QX), Filtek Supreme (FS), Apa Fill 3 (AF), an experimental dual-curing composite containing a bioactive glass (EX), Dyract eXtra (DY), Beautifil (BE), Equia Fil (EQ), Telio CAD (TL) (negative control), TheraCal (TC; positive control), and extracted teeth (ED)...
April 25, 2017: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/28443812/enhancing-ethanol-yields-through-d-xylose-and-l-arabinose-co-fermentation-after-construction-of-a-novel-high-efficient-l-arabinose-fermenting-saccharomyces-cerevisiae-strain
#20
Antonio Caballero, Juan Luis Ramos
Lignocellulose contains two pentose sugars, l-arabinose and d-xylose, neither of which is naturally fermented by first generation (1G) ethanol-producing Saccharomyces cerevisiae yeast. Since these sugars are inaccessible to 1G yeast, a significant percentage of the total carbon in bioethanol production from plant residues, which are used in second generation (2G) ethanol production, remains unused. Recombinant Saccharomyces cerevisiae strains capable of fermenting d-xylose are available on the market; however, there are few examples of l-arabinose-fermenting yeasts, and commercially, there are no strains capable of fermenting both d-xylose and l-arabinose because of metabolic incompatibilities when both metabolic pathways are expressed in the same cell...
April 2017: Microbiology
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