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https://www.readbyqxmd.com/read/28798524/analytical-and-computational-modelling-for-wave-energy-systems-the-example-of-oscillating-wave-surge-converters
#1
REVIEW
Frédéric Dias, Emiliano Renzi, Sarah Gallagher, Dripta Sarkar, Yanji Wei, Thomas Abadie, Cathal Cummins, Ashkan Rafiee
The development of new wave energy converters has shed light on a number of unanswered questions in fluid mechanics, but has also identified a number of new issues of importance for their future deployment. The main concerns relevant to the practical use of wave energy converters are sustainability, survivability, and maintainability. Of course, it is also necessary to maximize the capture per unit area of the structure as well as to minimize the cost. In this review, we consider some of the questions related to the topics of sustainability, survivability, and maintenance access, with respect to sea conditions, for generic wave energy converters with an emphasis on the oscillating wave surge converter...
2017: Acta Mechanica Sinica, Li Xue Xue Bao
https://www.readbyqxmd.com/read/28796721/mechanisms-predisposing-factors-and-prognosis-of-intraoperative-vertebral-subluxation-during-pedicle-subtraction-osteotomy-in-surgical-correction-of-thoracolumbar-kyphosis-secondary-to-ankylosing-spondylitis
#2
Bang-Ping Qian, Sai-Hu Mao, Jun Jiang, Bin Wang, Yong Qiu
STUDY DESIGN: A retrospective study. OBJECTIVE: To analyze the mechanisms, predisposing factors, and prognosis of the intraoperative vertebral subluxation (VS) during pedicle subtraction osteotomy (PSO) for thoracolumbar kyphosis secondary to ankylosing spondylitis (AS). SUMMARY OF BACKGROUND DATA: VS is one of the most daunting challenges that surgeons encounter during PSO closure, especially in patients with AS with ankylosed and mostly osteoporotic spine...
August 15, 2017: Spine
https://www.readbyqxmd.com/read/28796425/comparison-of-stroke-volume-measurements-during-hemodialysis-using-bioimpedance-cardiography-and-echocardiography
#3
Michael J Germain, Jyovani Joubert, Daniel O'Grady, Brian H Nathanson, Yossi Chait, Nathan W Levin
BACKGROUND: Fluid management remains a major challenge of hemodialysis (HD) care, with serious implications for morbidity and mortality. Intradialytic fluid management is typically guided by blood pressure, an indirect resultant of hemodynamics status. Direct measurements of hemodynamic parameters may improve cardiovascular outcomes by providing rational bases for intervention. We compare stroke volume (SV) measurements using a noninvasive, regional biompedance cardiography device (NiCaS) with Doppler echocardiography (Echo) in HD setting...
August 10, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28791006/regulation-of-lung-epithelial-sodium-channels-by-cytokines-and-chemokines
#4
REVIEW
Brandi M Wynne, Li Zou, Valerie Linck, Robert S Hoover, He-Ping Ma, Douglas C Eaton
Acute lung injury leading to acute respiratory distress (ARDS) is a global health concern. ARDS patients have significant pulmonary inflammation leading to flooding of the pulmonary alveoli. This prevents normal gas exchange with consequent hypoxemia and causes mortality. A thin fluid layer in the alveoli is normal. The maintenance of this thin layer results from fluid movement out of the pulmonary capillaries into the alveolar interstitium driven by vascular hydrostatic pressure and then through alveolar tight junctions...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28782881/from-peptide-masses-to-pregnancy-maintenance-a-comprehensive-proteomic-analysis-of-the-early-equine-embryo-secretome-blastocoel-fluid-and-capsule
#5
Aleona Swegen, Christopher Gerald Grupen, Zamira Gibb, Mark Baker, Marta de Ruijter-Villani, Nathan Druery Smith, Tom A E Stout, R John Aitken
Early pregnancy in the mare is a poorly understood, high risk period during which the embryo communicates its presence to the maternal endometrium. Remarkably, the maternal recognition of pregnancy signal is unknown in the horse. This study aimed to profile the proteins secreted by equine blastocysts into their immediate environment, along with proteins contained in the blastocoel and within the acellular embryo capsule. Embryos were recovered on day 8 after ovulation and cultured for 48 hours. Secretomes of day 9 and day 10 embryos were analyzed by LC-MS/MS and supported by analysis of blastocoel fluid and embryo capsule...
August 7, 2017: Proteomics
https://www.readbyqxmd.com/read/28780148/intra-abdominal-hypertension-abdominal-compartment-syndrome-and-the-open-abdomen
#6
REVIEW
William Kirke Rogers, Luis Garcia
Abdominal Compartment Syndrome (ACS) is the endpoint of a process whereby massive interstitial swelling in the abdomen or rapid development of a space-filling lesion within the abdomen (such as ascites or a hematoma) leads to a pathologically increased pressure. This results in so-called Intra-Abdominal Hypertension (IAH), causing decreased perfusion of the kidneys and abdominal viscera and possible difficulties with ventilation and maintenance of cardiac output. These effects contribute to a cascade of ischemia and multiple organ dysfunction with high mortality...
August 2, 2017: Chest
https://www.readbyqxmd.com/read/28774926/complete-measurement-of-helicity-and-its-dynamics-in-vortex-tubes
#7
Martin W Scheeler, Wim M van Rees, Hridesh Kedia, Dustin Kleckner, William T M Irvine
Helicity, a topological measure of the intertwining of vortices in a fluid flow, is a conserved quantity in inviscid fluids but can be dissipated by viscosity in real flows. Despite its relevance across a range of flows, helicity in real fluids remains poorly understood because the entire quantity is challenging to measure. We measured the total helicity of thin-core vortex tubes in water. For helical vortices that are stretched or compressed by a second vortex, we found conservation of total helicity. For an isolated helical vortex, we observed evolution toward and maintenance of a constant helicity state after the dissipation of twist helicity by viscosity...
August 4, 2017: Science
https://www.readbyqxmd.com/read/28770553/perioperative-technical-complications-in-deep-brain-stimulation-surgeries
#8
Onur Alptekin, Ersoy Kocabicak, Felix S Gubler, Linda Ackermans, Pieter L Kubben, Yasin Temel
AIM: Deep brain stimulation (DBS) surgeries are multi-faceted and the various steps are interconnected. Since its first implementation, the method of DBS surgery has undergone changes. We have encountered several expected and also non-expected perioperative technical complications in the past seventeen years. Here, we describe the stereotactic frame, stereotactic localizer and planning station related complications and how we have managed them as much as possible. MATERIAL AND METHODS: This study is a retrospective qualitative analysis of the documented technical events encountered during DBS surgeries from 1999 onwards...
June 14, 2017: Turkish Neurosurgery
https://www.readbyqxmd.com/read/28767472/intrathecal-migration-of-an-epidural-catheter-while-using-a-programmed-intermittent-epidural-bolus-technique-for-labor-analgesia-maintenance-a-case-report
#9
Francesca Betti, Brendan Carvalho, Edward T Riley
We describe a case of intrathecal migration of a wire-reinforced epidural catheter in a parturient who received epidural labor analgesia. Epidural analgesia was initiated with a combined-spinal epidural technique and maintained by programmed intermittent epidural boluses. Epidural catheter aspiration after insertion was negative for cerebrospinal fluid. The patient's response to the first four doses of local anesthetic was consistent with epidural drug delivery. After the fifth dose, she developed a complete lower extremity motor block, hypotension, and high sensory blockade...
August 1, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28763577/bioreactors-with-hydrostatic-pressures-imitating-physiological-environments-in-intervertebral-discs
#10
REVIEW
Jovana Zvicer, Bojana Obradovic
Intervertebral discs are normally exposed to variety of loads and stresses but hydrostatic pressure (HP) could be the main biosignal for chondrogenic cell differentiation and maintenance of this tissue. Although there are simple approaches to intermittently expose cell cultures to HP in separate material testing devices, utilization of biomimetic bioreactors aiming to provide in vitro conditions mimicking those found in vivo, attracts special attention. However, design of such bioreactors is complex due to the requirement of high HP magnitudes (up to 3 MPa) applied in different regimes mimicking pressures arising in IVD during normal daily activities...
August 1, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28744943/internal-carotid-external-carotid-and-vertebral-artery-blood-flow-responses-to-a-3-day-of-head-out-dry-immersion
#11
Shigehiko Ogoh, Ai Hirasawa, Steven de Abreu, Pierre Denise, Hervé Normand
We have recently demonstrated that heterogeneous cerebral blood flow (CBF) response in each cerebral artery may contribute to the maintenance of circulatory homeostasis in the brain. However, to what extent weightlessness associated with fluid shift from peripheral to central circulations influences distribution of CBF in each cerebral artery remains unknown. We hypothesised that dry immersion-induced fluid shift (weightlessness condition) would cause heterogeneous CBF response in each cerebral artery. During and after a 3-day dry immersion, internal carotid (ICA), external carotid (ECA) and vertebral arteries (VA) blood flows were measured by Doppler ultrasonography using an 8-MHz linear transducer...
July 26, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28724996/dynamics-of-high-viscosity-contrast-confluent-microfluidic-flows
#12
Michael E Kurdzinski, Berrak Gol, Aaron Co Hee, Peter Thurgood, Jiu Yang Zhu, Phred Petersen, Arnan Mitchell, Khashayar Khoshmanesh
The laminar nature of microfluidic flows is most elegantly demonstrated via the confluence of two fluids forming two stable parallel flows within a single channel meeting at a highly stable interface. However, maintenance of laminar conditions can become complicated when there is a large viscosity contrast between the neighbouring flows leading to unique instability patterns along their interface. Here, we study the dynamics of high viscosity contrast confluent flows - specifically a core flow made of highly viscous glycerol confined by sheath flows made of water within a microfluidic flow focusing system...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28715944/comparison-of-two-different-techniques-used-for-the-maintenance-ofperi-implant-soft-tissue-health-a-pilot-randomized-clinical-trial
#13
Logien Al Ghazal, Jeffery O'Sullivan, Noel Claffey, Ioannis Polyzois
OBJECTIVES: The aim of this pilot study was to compare the effectiveness of two different methods of debridement on maintaining and improving peri-implant soft tissue health over a period of 12 months. MATERIALS AND METHODS: Twenty adult patients (25 implants) were enrolled in a randomized, single-blinded, parallel group clinical trial. All implants included showed no signs of pathologic bone loss. Patients were scheduled to be reviewed every 3 months over a 12 months period...
July 17, 2017: Acta Odontologica Scandinavica
https://www.readbyqxmd.com/read/28715092/the-origins-of-oral-medicine-in-the-hippocratic-collected-works
#14
REVIEW
Helen Askitopoulou, Vasileia Nyktari, Alexandra Papaioannou, Georgios Stefanakis, Elina Konsolaki
The collected works of Hippocrates describe for the first time in a systematic way a large number of oral diseases, such as ulcers, inflammations, abscesses and tumours from the epiglottis, mouth, tongue, palate, uvula and the sublingual area. Several of these case reports are remarkable for the accurate observation of clinical symptoms and signs, the aetiology, the pathogenesis and their therapeutic approach in relation to prognosis. The Hippocratic authors report cases of 'aphthae' as part of a polysystemic disease, described many centuries later by Behçet and Adamantiades, while they associate features of splenomegaly from endemic malaria with gingivitis ('ulitis')...
July 17, 2017: Journal of Oral Pathology & Medicine
https://www.readbyqxmd.com/read/28707233/inflammatory-follicular-cysts-associated-to-necrotic-primary-teeth
#15
N P Marques, N C T Marques, V T Sakai, J A C Hanemann
BACKGROUND: Cysts are pathological cavities lined by epithelium and supported by connective tissue, containing fluid or semi-fluid substances and presenting developmental or inflammatory origins. CASE REPORT: This study aimed to evaluate a case series of inflammatory follicular cysts in children to clarify their nomenclature, diagnosis, clinical implications and treatment outcomes. Prevalence, aetio-pathogenesis, clinical, radiographic and microscopic findings, treatments and sequelae of this condition were assessed by using the records of patients treated between 2000 and 2015...
July 13, 2017: European Archives of Paediatric Dentistry: Official Journal of the European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/28706505/cell-cell-interaction-proteins-gap-junctions-tight-junctions-and-desmosomes-and-water-transporter-aquaporin-4-in-meningothelial-cells-of-the-human-optic-nerve
#16
Thi Ngoc Co Zeleny, Corina Kohler, Albert Neutzner, Hanspeter E Killer, Peter Meyer
PURPOSE: Meningothelial cells (MECs) play a central role in the maintenance of cerebrospinal fluid (CSF) homeostasis and in physiological and pathophysiological processes within the subarachnoid space (SAS) linking them to optic nerve (ON) pathologies. Still, not much is known about their structural properties that might enable MECs to perform specific functions within the ON microenvironment. METHODS: For closer characterization of the structural properties of the human MEC layer in the arachnoid, we performed immunohistological analyses to evaluate the presence of cell-cell interaction markers, namely, markers for tight junctions (JAM1, Occludin, and Claudin 5), gap junctions (Connexin 26 and 43), and desmosomes (Desmoplakin) as well as for water channel marker aquaporin 4 (AQP4) in retrobulbar, midorbital, and intracanalicular human ON sections...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28701976/a-latent-factor-analysis-of-working-memory-measures-using-large-scale-data
#17
Otto Waris, Anna Soveri, Miikka Ahti, Russell C Hoffing, Daniel Ventus, Susanne M Jaeggi, Aaron R Seitz, Matti Laine
Working memory (WM) is a key cognitive system that is strongly related to other cognitive domains and relevant for everyday life. However, the structure of WM is yet to be determined. A number of WM models have been put forth especially by factor analytical studies. In broad terms, these models vary by their emphasis on WM contents (e.g., visuospatial, verbal) vs. WM processes (e.g., maintenance, updating) as critical, dissociable elements. Here we conducted confirmatory and exploratory factor analyses on a broad set of WM tasks, half of them numerical-verbal and half of them visuospatial, representing four commonly used task paradigms: simple span, complex span, running memory, and n-back...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28700464/cryptococcal-meningitis-after-transnasal-transsphenoidal-pituitary-microsurgery-of-acth-secreting-pituitary-adenoma-a-case-report
#18
Yang Liu, Ming Feng, Yong Yao, Kan Deng, Xinjie Bao, Xiaohai Liu, Renzhi Wang
RATIONALE: Microbial infection should be regarded in the differential diagnosis of neurosurgical complications after transnasal transsphenoidal pituitary microsurgery, albeit cryptococcal meningitis is rare. This article will discuss the risk factors of cryptococcal meningitis in patients underwent transnasal transsphenoidal pituitary microsurgery, and summary the potential origins of infection. PATIENT CONCERNS AND DIAGNOSIS: Here, we report a case of 37-year-old male who had cryptococcal meningitis after transnasal transsphenoidal pituitary microsurgery of a relapsing ACTH-secreting pituitary adenoma...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28698301/prdm16-is-required-for-the-maintenance-of-neural-stem-cells-in-the-postnatal-forebrain-and-their-differentiation-into-ependymal-cells
#19
Issei S Shimada, Melih Acar, Rebecca J Burgess, Zhiyu Zhao, Sean J Morrison
We and others showed previously that PR domain-containing 16 (Prdm16) is a transcriptional regulator required for stem cell function in multiple fetal and neonatal tissues, including the nervous system. However, Prdm16 germline knockout mice died neonatally, preventing us from testing whether Prdm16 is also required for adult stem cell function. Here we demonstrate that Prdm16 is required for neural stem cell maintenance and neurogenesis in the adult lateral ventricle subventricular zone and dentate gyrus. We also discovered that Prdm16 is required for the formation of ciliated ependymal cells in the lateral ventricle...
June 1, 2017: Genes & Development
https://www.readbyqxmd.com/read/28691556/fluid-management-during-the-first-postnatal-day-in-very-low-birth-weight-neonates-and-rates-of-patent-ductus-arteriosus-requiring-treatment
#20
Michelle B Levinson, Catherine Messina, Jonathan P Mintzer
PURPOSE: Previous studies have suggested an association between high maintenance fluid volumes during the first several postnatal days and patent ductus arteriosus (PDA) requiring treatment in very low birth weight (VLBW) neonates. However, no studies have specifically examined fluid administration during the first postnatal day with regard to PDA-related outcomes. We seek to determine whether additional intravenous fluid administration beyond prescribed goals during the first postnatal day is associated with PDA requiring treatment...
July 10, 2017: Journal of Maternal-fetal & Neonatal Medicine
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