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https://www.readbyqxmd.com/read/28637255/a-biomechanical-study-of-4-different-sternum-closure-techniques-under-different-deformation-modes
#1
Suleyman Nazif Orhan, Mehmet Hamit Ozyazicioglu, Abdurrahim Colak
OBJECTIVES: This study experimentally compares the efficiency of the 4 most preferred sternal closure tehniques, in 3 different deformation modes of the chest. METHODS: Polyurethane sternum models fixed by conventional wiring, steel band, ZipFix band and figure-8 wiring are tested statically under lateral distraction, longitudinal shear and torsional deformation modes. As a result, load-deformation curves are obtained. The closure efficiency of the techniques is then compared with respect to allowable load (corresponding to 2 mm displacement), rigidity, rupture load and rupture displacement...
June 15, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28636594/surface-tension-prevails-over-solute-effect-in-organic-influenced-cloud-droplet-activation
#2
Jurgita Ovadnevaite, Andreas Zuend, Ari Laaksonen, Kevin J Sanchez, Greg Roberts, Darius Ceburnis, Stefano Decesari, Matteo Rinaldi, Natasha Hodas, Maria Cristina Facchini, John H Seinfeld, Colin O' Dowd
The spontaneous growth of cloud condensation nuclei (CCN) into cloud droplets under supersaturated water vapour conditions is described by classic Köhler theory. This spontaneous activation of CCN depends on the interplay between the Raoult effect, whereby activation potential increases with decreasing water activity or increasing solute concentration, and the Kelvin effect, whereby activation potential decreases with decreasing droplet size or increases with decreasing surface tension, which is sensitive to surfactants...
June 21, 2017: Nature
https://www.readbyqxmd.com/read/28636498/a-novel-clinical-simulated-suture-education-for-basic-surgical-skill-suture-on-the-biological-tissue-fixed-on-standardized-patient-evaluated-with-objective-structured-assessment-of-technical-skill-osats-tools
#3
Zhanlong Shen, Fan Yang, Pengji Gao, Li Zeng, Guanchao Jiang, Shan Wang, Yingjiang Ye, Fengxue Zhu
BACKGROUND: Clinical-simulated training has shown benefit in the education of medical students. However, the role of clinical simulation for surgical basic skill training such as suturing techniques remains unclear. MATERIALS AND METHODS: Forty-two medical students were asked to perform specific suturing tasks at three stations with the different settings within four minutes (Station 1: Synthetic suture pad fixed on the bench, Station 2: Synthetic suture pad fixed on the standardized patient, Station 3: Pig skin fixed on the standardized patient); the OSATS (Objective Structured Assessment of Technical Skill) tool was used to evaluate the performance of students...
June 21, 2017: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/28636430/when-is-embryonic-arrest-broken-in-turtle-eggs
#4
Sean A Williamson, Roger G Evans, Richard D Reina
Turtle embryos enter a state of arrested development in the oviduct, allowing the mother greater flexibility in her reproductive schedule. Development recommences once eggs transition from the hypoxic oviduct to the normoxic nest. Significant mortality can occur if turtle eggs are moved between 12 h and 20 d after oviposition, and this is linked to the recommencement of embryonic development. To better understand the timing of developmental arrest and to determine how movement-induced mortality might be avoided, we determined the latency (i...
September 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/28635661/hypoxic-preconditioning-promotes-the-bioactivities-of-mesenchymal-stem-cells-via-the-hif-1%C3%AE-grp78-akt-axis
#5
Jun Hee Lee, Yeo Min Yoon, Sang Hun Lee
Mesenchymal stem cells (MSC) are ideal materials for stem cell-based therapy. As MSCs reside in hypoxic microenvironments (low oxygen tension of 1% to 7%), several studies have focused on the beneficial effects of hypoxic preconditioning on MSC survival; however, the mechanisms underlying such effects remain unclear. This study aimed to uncover the potential mechanism involving 78-kDa glucose-regulated protein (GRP78) to explain the enhanced MSC bioactivity and survival in hindlimb ischemia. Under hypoxia (2% O₂), the expression of GRP78 was significantly increased via hypoxia-inducible factor (HIF)-1α...
June 21, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28635642/lack-of-association-between-serum-vitamin-b%C3%A2-vitamin-b12-and-vitamin-d-levels-with-different-types-of-glaucoma-a-systematic-review-and-meta-analysis
#6
Shengjie Li, Danhui Li, Mingxi Shao, Wenjun Cao, Xinghuai Sun
Although vitamins play a major role in health, and their deficiency may be linked to symptoms of optic-nerve dysfunction, the association between serum vitamin levels and glaucoma in humans remains controversial. In this study, articles in the PubMed, Web of Science, and EMBASE databases were searched up to 25March 2017. Nine studies on primary open-angle glaucoma (POAG), four studies on normal tension glaucoma (NTG), and six studies on exfoliative glaucoma (EXG) were retrieved. The combined results showed no differences in the levels of serum vitamin B₆ between POAG (p = 0...
June 21, 2017: Nutrients
https://www.readbyqxmd.com/read/28635295/coarse-grained-models-of-aqueous-and-pure-liquid-alkanes
#7
Gaurav Gyawali, Samuel Sternfield, Revati Kumar, Steven W Rick
A model for linear alkanes is presented in which interaction sites are only on the carbon atoms and the range of the potential is reduced using the Stillinger-Weber potential. The model is optimized for aqueous and liquid alkane properties and can match thermodynamic and structural properties, including solvation free energies, liquid densities, and liquid/vapor and liquid/water surface tensions for alkanes over a range of lengths.The results for long alkanes indicates that such models can be useful as accurate, yet efficient, coarse-grained potentials for macromolecules in water and other environments...
June 21, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28635148/how-common-are-cranial-sesamoids-among-squamates
#8
Ricardo Montero, Juan D Daza, Aaron M Bauer, Virginia Abdala
Sesamoids are elements that originate as intratendinous structures due to genetic and epigenetic factors. These elements have been reported frequently in vertebrates, although cranial sesamoids have been recorded almost exclusively in non-tetrapod Osteichthyes. The only tetrapod cranial sesamoids reported until now have been the transiliens cartilage (of crocodiles and turtles), and another one located in the quadrate-mandibular joint of birds. Here, we examined seven squamate species using histological sections, dissections of preserved specimens, dry skeletons, cleared and stained specimens, computed tomographies (CT), and report the presence of other cranial sesamoids...
June 20, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28634743/comminuted-olecranon-fractures-biomechanical-testing-of-locked-versus-minifragment-non-locked-plate-fixation
#9
David S Wellman, Scott M Tucker, Josh R Baxter, Nadine C Pardee, Lionel E Lazaro, Christopher S Smith, Dean G Lorich, David L Helfet
INTRODUCTION: Open reduction and internal fixation has long been accepted as optimal treatment for displaced olecranon fractures based on poor results seen with conservative management. With the presence of comminution, tension-band wiring constructs are contraindicated due to tendency to compress through fragments, thereby shortening the articular segment. Therefore, plate fixation is typically employed. Our hypothesis was that in a comminuted fracture model, 2.7 mm reconstruction plating without locking screws will perform equally to 3...
June 20, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28634415/force-induced-increased-osteogenesis-enables-accelerated-orthodontic-tooth-movement-in-ovariectomized-rats
#10
Qinggang Dai, Siru Zhou, Peng Zhang, Xuhui Ma, Nayong Ha, Xiao Yang, Zhifeng Yu, Bing Fang, Lingyong Jiang
As the number of elderly orthodontic patients increases, the impact of postmenopausal osteoporosis on orthodontic tooth movement (OTM) has attracted a great deal of attention because OTM relies on alveolar bone remodeling. The question of whether OTM causes subsequent alveolar bone loss and is harmful to alveolar bone health under osteoporotic conditions remains to be answered. The present study aimed to clarify the influences of OTM on alveolar bone in osteoporotic rats. OTM was accelerated in ovariectomized (OVX) rats as a result of increased bone resorption in the pressure area...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28633560/bioinspired-hydrogels-to-engineer-cancer-microenvironments
#11
Kyung Min Park, Daniel Lewis, Sharon Gerecht
Recent research has demonstrated that tumor microenvironments play pivotal roles in tumor development and metastasis through various physical, chemical, and biological factors, including extracellular matrix (ECM) composition, matrix remodeling, oxygen tension, pH, cytokines, and matrix stiffness. An emerging trend in cancer research involves the creation of engineered three-dimensional tumor models using bioinspired hydrogels that accurately recapitulate the native tumor microenvironment. With recent advances in materials engineering, many researchers are developing engineered tumor models, which are promising platforms for the study of cancer biology and for screening of therapeutic agents for better clinical outcomes...
June 21, 2017: Annual Review of Biomedical Engineering
https://www.readbyqxmd.com/read/28633298/protein-expression-in-tension-wood-formation-monitored-at-high-tissue-resolution-in-populus
#12
Joakim Bygdell, Vaibhav Srivastava, Ogonna Obudulu, Manoj K Srivastava, Robert Nilsson, Björn Sundberg, Johan Trygg, Ewa J Mellerowicz, Gunnar Wingsle
Tension wood (TW) is a specialized tissue with contractile properties that is formed by the vascular cambium in response to gravitational stimuli. We quantitatively analysed the proteomes of Populus tremula cambium and its xylem cell derivatives in stems forming normal wood (NW) and TW to reveal the mechanisms underlying TW formation. Phloem-, cambium-, and wood-forming tissues were sampled by tangential cryosectioning and pooled into nine independent samples. The proteomes of TW and NW samples were similar in the phloem and cambium samples, but diverged early during xylogenesis, demonstrating that reprogramming is an integral part of TW formation...
June 13, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28633249/augmentation-of-bridging-leaflets-in-repair-of-atrioventricular-canal-defects
#13
Christopher W Baird, Christian Kreutzer, Stephen P Sanders, Michele J Borisuk, Pedro J Del Nido
Left atrioventricular (AV) valve regurgitation is the most common complication after a atrioventricular canal defect (AVCD) repair. Despite what appears to be a less complex repair, patients with partial and transitional AV canal have higher reoperation rates for left AV valve regurgitation and left ventricular outflow tract (LVOT) obstruction. Retraction of bridging leaflets with secondary attachments to the septal crest commonly produces increased tension and flattening of the medial left AV valve leaflet and LVOT obstruction after cleft closure...
July 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28632289/novel-anterior-plating-technique-for-patella-fracture-fixation
#14
Matthew P Siljander, Alexander D Vara, Denise M Koueiter, Brett P Wiater, Patrick J Wiater
Patella fracture fixation remains a significant challenge for orthopedic surgeons. Although tension band fixation allows for reliable osseous union, especially in simple fracture patterns, it still presents several problems. Plate fixation of patella fractures is a method that allows for more rigid stabilization and earlier mobilization. At the authors' level 1 trauma center, one fellowship-trained trauma surgeon has transitioned to using a novel anterior, low-profile mesh plate construct for all types of patella fractures...
June 20, 2017: Orthopedics
https://www.readbyqxmd.com/read/28632147/crossover-iliofemoral-bypass-graft-through-tension-free-abdominal-wall-repair-mesh
#15
Mircea Muresan, Ovidiu Jimborean, Gabriela Jimborean, Radu Neagoe, Serban Bancu, Muresan Simona, Cristian Borz
INTRODUCTION: In vascular surgery the crossover iliofemoral bypass grafting is a well-known surgical technique. In general surgery the repair of an abdominal defect using a Polypropylene mesh is also a standard procedure. A particular technique is defined by the performance of these 2 separate procedures inside a single operation in which the crossover arterial graft is directed from the retroperitoneal space toward the contra-lateral femoral bifurcation through a Polypropylene mesh which closes the musculoaponeurotic layers of the abdominal wall...
June 8, 2017: Annali Italiani di Chirurgia
https://www.readbyqxmd.com/read/28630758/optimising-position-and-stability-in-total-knee-arthroplasty
#16
Jan Victor
Alignment and stability are two key factors for success in total knee arthroplasty (TKA). Several techniques have been advocated, the two best known being measured resection and tensioned gaps.Dogma and fuzzy wording have cast an obscure shadow on the dualistic discussion between proponents of both techniques.This review is an attempt to clarify definitions, analyse the flaws and pitfalls in the different techniques and make some suggestions for improvement. Cite this article: EFORT Open Rev 2017;2. DOI: 10...
May 2017: EFORT open reviews
https://www.readbyqxmd.com/read/28630671/bsla-stabilized-emulsion-droplets-with-designed-microstructure
#17
Keith M Bromley, Cait E MacPhee
Emulsions are a central component of many modern formulations in food, pharmaceuticals, agrichemicals and personal care products. The droplets in these formulations are limited to being spherical as a consequence of the interfacial tension between the dispersed phase and continuous phase. The ability to control emulsion droplet morphology and stabilize non-spherical droplets would enable the modification of emulsion properties such as stability, substrate binding, delivery rate and rheology. One way of controlling droplet microstructure is to apply an elastic film around the droplet to prevent it from relaxing into a sphere...
August 6, 2017: Interface Focus
https://www.readbyqxmd.com/read/28629252/study-of-composite-vascular-scaffold-combining-with-differentiated-vsmc-and-vec-like-cells-in%C3%A2-vitro-and-in%C3%A2-vivo
#18
Xuqian Liu, Jie Wang, Fusheng Dong, Peng Song, Hexiang Li, Yali Hou
Although research into the tissue engineering of vessels has proceeded at a tremendous pace, many deficiencies still need to be resolved. A well-adopted constructed vessel requires both functional and structural properties to stimulate the native vessel and resist stress and tension in vivo. In the present study, we developed a novel three-layer composite vascular scaffold consisting of differentiated vascular smooth muscle cell-, vascular endothelial cell-like cells, and a rabbit acellular vascular matrix (ACVM)-0...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28628809/distrust-of-the-senses-and-its-association-with-obsessive-compulsive-symptoms
#19
Shiu F Wong, Alishia D Williams, Jessica R Grisham
BACKGROUND AND OBJECTIVES: Leading cognitive theories of OCD suggests that despite prevalent and persistent doubt, individuals with OCD do not have perceptual deficits. An alternate cognitive theory, the Seeking Proxies for Internal States hypothesis (SPIS), proposes that sensory distrust in OCD stems from actual deficits in accessing internal states. Consistent with the SPIS, previous research has found that high-OC individuals were less accurate than low-OC individuals in producing target levels of muscle tension in a biofeedback task and that OC symptoms were positively associated with reliance on an external proxy...
June 13, 2017: Journal of Behavior Therapy and Experimental Psychiatry
https://www.readbyqxmd.com/read/28628626/is-normal-tension-glaucoma-a-risk-factor-for-stroke-a-10-year-follow-up-study
#20
Meng-Sheng Lee, Li-Lin Kuo, Elise Chia-Hui Tan, Oscar K Lee
OBJECTIVES: To investigate whether patients with normal-tension glaucoma (NTG) have a higher incidence of stroke. DESIGN: A population-based retrospective cohort study based on data from the Taiwan National Health Insurance Research Database (NHIRD) from January 1, 2001, to December 31, 2010. METHODS: Data were retrospectively collected from the NHIRD. A total of 245 (20.1%) patients with a history of stroke at the time of glaucoma diagnosis were excluded, and 1,218 patients with NTG who were 20 years of age and older were identified...
2017: PloS One
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