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https://www.readbyqxmd.com/read/28722137/precise-and-arbitrary-deposition-of-biomolecules-onto-biomimetic-fibrous-matrices-for-spatially-controlled-cell-distribution-and-functions
#1
Chao Jia, Bowen Luo, Haoyu Wang, Yongqian Bian, Xueyong Li, Shaohua Li, Hongjun Wang
Advances in nano-/microfabrication allow the fabrication of biomimetic substrates for various biomedical applications. In particular, it would be beneficial to control the distribution of cells and relevant biomolecules on an extracellular matrix (ECM)-like substrate with arbitrary micropatterns. In this regard, the possibilities of patterning biomolecules and cells on nanofibrous matrices are explored here by combining inkjet printing and electrospinning. Upon investigation of key parameters for patterning accuracy and reproducibility, three independent studies are performed to demonstrate the potential of this platform for: i) transforming growth factor (TGF)-β1-induced spatial differentiation of fibroblasts, ii) spatiotemporal interactions between breast cancer cells and stromal cells, and iii) cancer-regulated angiogenesis...
July 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28719744/high-resolution-insights-into-the-stepwise-self-assembly-of-nanofiber-from-bioactive-peptides
#2
Fude Sun, Long Chen, Xiufang Ding, Lida Xu, Xirui Zhou, Peng Wei, Jun-Feng Liang, Shi-Zhong Luo
Peptide self-assembly has a profound biological significance since self-assembled bioactive peptides are gifted with improved bioactivity as well as life-span. In this study, peptide self-assembly was investigated using a therapeutic peptide, PTP-7S (EENFLGALFKALSKLL). Combining experiments of atomic force microscopy (AFM), circular dichroism (CD) and 8-anilino-1-naphthalenesulfonic acid (ANS) fluorescence spectra, PTP-7S showing α-helix was found self-assembling into nanofibers in solution. Relying on the coarse-grained (CG) dynamic simulations, the self-assembling of PTP-7S was revealed as a stepwise process that peptide monomers first clustered into peptide-assembling units (PUs) with charged surface, and then the PUs integrated together to construct nano-fibril aggregates...
July 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28718896/nomograms-for-preoperative-prediction-of-axillary-nodal-status-in-breast-cancer
#3
L Dihge, P-O Bendahl, L Rydén
BACKGROUND: Axillary staging in patients with breast cancer and clinically node-negative disease is performed by sentinel node biopsy (SLNB). The aim of this study was to integrate feasible preoperative variables into nomograms to guide clinicians in stratifying treatment options into no axillary staging for patients with non-metastatic disease (N0), SLNB for those with one or two metastases, and axillary lymph node dissection (ALND) for patients with three or more metastases. METHODS: Patients presenting to Skåne University Hospital, Lund, with breast cancer were included in a prospectively maintained registry between January 2009 and December 2012...
July 18, 2017: British Journal of Surgery
https://www.readbyqxmd.com/read/28717548/infective-complications-in-patients-after-transrectal-ultrasound-guided-prostate-biopsy-and-the-role-of-ciprofloxacin-resistant-escherichia-coli-colonization-in-rectal-flora
#4
Mustafa Bilal Hamarat, Fatih Tarhan, Rahim Horuz, Gülfem Akengin Öcal, Mehmet Kutlu Demirkol, Alper Kafkaslı, Özgür Yazıcı
OBJECTIVE: In the present study, we aimed to invastigate the ciprofloxacin resistance in rectal flora of the patients undergoing prostate biopsy in our department. Additionally, the possible effects of the presence of ciprofloxacin resistant bacteria in faecal flora on the risk of infective complications after the procedure as well as the effect of antibiotic prophylaxis on such infectious complications have been evaluated. MATERIAL AND METHODS: A total of 142 patients undergoing transrectal ultrasound-guided prostate biopsy were included into the study program...
June 2017: Turkish Journal of Urology
https://www.readbyqxmd.com/read/28715553/validation-of-the-children-s-hospital-of-philadelphia-retinopathy-of-prematurity-chop-rop-model
#5
Gil Binenbaum, Gui-Shuang Ying, Lauren A Tomlinson
Importance: The Children's Hospital of Philadelphia Retinopathy of Prematurity (CHOP ROP) model uses birth weight (BW), gestational age at birth (GA), and weight gain rate to predict the risk of severe retinopathy of prematurity (ROP). In a model development study, it predicted all infants requiring treatment, while greatly reducing the number of examinations compared with current screening guidelines. Objective: To validate the CHOP ROP model in a multicenter cohort that is large enough to obtain a precise estimate of the model's sensitivity for treatment-requiring ROP...
July 13, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28711232/sleep-an-underemphasized-aspect-of-health-and-development-in-neurorehabilitation
#6
Olaf Verschuren, Jan Willem Gorter, Lesley Pritchard-Wiart
Sleep deficiency has unique causes and implications for children with neonatal brain injury; contributing to the development or exacerbation of neurodevelopmental impairments and yet it is an underemphasized aspect of health and development. There is very little research evidence to guide the management of sleep disorders in children with cerebral palsy, a common neurodevelopmental disability of childhood. This paper is a comprehensive review and analysis of the literature regarding what is known about sleep quantity and quality in children with cerebral palsy...
July 12, 2017: Early Human Development
https://www.readbyqxmd.com/read/28710460/effects-of-sediment-smothering-on-the-sponge-holobiont-with-implications-for-dredging-management
#7
Mari-Carmen Pineda, Brian Strehlow, Miriam Sternel, Alan Duckworth, Joost den Haan, Ross Jones, Nicole S Webster
One of the ways dredging can affect benthic habitats is through high levels of sediment deposition, which has the potential to smother sessile organisms such as sponges. In order to provide pressure-response values to sedimentation and tease apart the different cause-effect pathways of high turbidity, 5 sponge species, including heterotrophic and phototrophic nutritional modes, were exposed for up to 30 d to multiple sediment deposition events, each of which resulted in an initial covering of 80-100% of the surface of the sponges in a layer ~0...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28709422/evaluation-on-equality-and-efficiency-of-health-resources-allocation-and-health-services-utilization-in-china
#8
Jian Sun, Hongye Luo
BACKGROUND: China is faced with a daunting challenge to equality and efficiency in health resources allocation and health services utilization in the context of rapid economic growth. This study sought to evaluate the equality and efficiency of health resources allocation and health services utilization in China. METHODS: Demographic, economic, and geographic area data was sourced from China Statistical Yearbook 2012-2016. Data related to health resources and health services was obtained from China Health Statistics Yearbook 2012-2016...
July 14, 2017: International Journal for Equity in Health
https://www.readbyqxmd.com/read/28708272/prognostic-accuracy-of-cerebroplacental-ratio-and-middle-cerebral-artery-doppler-for-adverse-perinatal-outcomes-a-systematic-review-and-meta-analysis
#9
REVIEW
Charlotte A Schreurs, Marjon A de Boer, Martijn W Heymans, Linda J Schoonmade, Patrick M M Bossuyt, Ben Willem J Mol, Christianne J M de Groot, Caroline J Bax
OBJECTIVE: Ultrasonographic assessment of the cerebroplacental ratio (CPR) and middle cerebral artery (MCA) Doppler is widely used as an additional method to umbilical artery (UA) Doppler to identify fetuses at risk of adverse perinatal outcomes. However, reported estimates of its accuracy vary considerably. We conducted a systematic review with meta-analysis of studies on the prognostic accuracy of CPR and MCA Doppler, and compared this to UA Doppler. METHODS: We queried PubMed, EMBASE, the Cochrane Library, and ClinicalTrials...
July 14, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28707281/towards-a-comprehensive-conceptual-framework-of-active-travel-behavior-a-review-and-synthesis-of-published-frameworks
#10
REVIEW
Thomas Götschi, Audrey de Nazelle, Christian Brand, Regine Gerike
PURPOSE OF REVIEW: This paper reviews the use of conceptual frameworks in research on active travel, such as walking and cycling. Generic framework features and a wide range of contents are identified and synthesized into a comprehensive framework of active travel behavior, as part of the Physical Activity through Sustainable Transport Approaches project (PASTA). PASTA is a European multinational, interdisciplinary research project on active travel and health. RECENT FINDINGS: Along with an exponential growth in active travel research, a growing number of conceptual frameworks has been published since the early 2000s...
July 13, 2017: Current Environmental Health Reports
https://www.readbyqxmd.com/read/28706493/protein-phosphorylation-and-mineral-binding-affect-the-secondary-structure-of-the-leucine-rich-amelogenin-peptide
#11
Hajime Yamazaki, Elia Beniash, Yasuo Yamakoshi, James P Simmer, Henry C Margolis
Previously, we have shown that serine-16 phosphorylation in native full-length porcine amelogenin (P173) and the Leucine-Rich Amelogenin Peptide (LRAP(+P)), an alternative amelogenin splice product, affects protein assembly and mineralization in vitro. Notably, P173 and LRAP(+P) stabilize amorphous calcium phosphate (ACP) and inhibit hydroxyapatite (HA) formation, while non-phosphorylated counterparts (rP172, LRAP(-P)) guide the growth of ordered bundles of HA crystals. Based on these findings, we hypothesize that the phosphorylation of full-length amelogenin and LRAP induces conformational changes that critically affect its capacity to interact with forming calcium phosphate mineral phases...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28702592/inhibition-of-gnnqqny-prion-peptide-aggregation-by-trehalose-a-mechanistic-view
#12
Nidhi Katyal, Shashank Deep
Deposition of amyloid fibrils is the seminal event in the pathogenesis of numerous neurodegenerative diseases. The formation of this amyloid assembly is the manifestation of a cascade of structural transitions including toxic oligomer formation in the early stages of aggregation. Thus a viable therapeutic strategy involves the use of small molecular ligands to interfere with this assembly. In this perspective, we have explored the kinetics of aggregate formation of the fibril forming GNNQQNY peptide fragment from the yeast prion protein SUP35 using multiple all atom MD simulations with explicit solvent and provided mechanistic insights into the way trehalose, an experimentally known aggregation inhibitor, modulates the aggregation pathway...
July 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28701504/degradation-and-erosion-mechanisms-of-bioresorbable-porous-acellular-vascular-grafts-an-in-vitro-investigation
#13
Piyusha S Gade, Keewon Lee, Blaise N Pfaff, Yadong Wang, Anne M Robertson
A fundamental mechanism of in situ tissue regeneration from biodegradable synthetic acellular vascular grafts is the effective interplay between graft degradation, erosion and the production of extracellular matrix. In order to understand this crucial process of graft erosion and degradation, we conducted an in vitro investigation of grafts (n = 4 at days 1, 4, 7, 10 each) exposed to enzymatic degradation. Herein, we provide constitutive relationships for mass loss and mechanical properties based on much-needed experimental data...
July 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28701073/the-role-of-rhfgf-2-soaked-polymer-membrane-for-enhancement-of-guided-bone-regeneration
#14
Sang-Hoon Lee, Young-Bum Park, Hong-Seok Moon, June-Sung Shim, Han-Sung Jung, Hyung Jun Kim, Moon-Kyu Chung
The purposes of this study are to confirm the role of Fibroblast Growth Factor-2 (FGF-2) in bone regeneration by adding various concentrations of FGF-2 to the collagen membrane and applying it to the Biphasic Calcium Phosphate (BCP) bone graft site for guided bone regeneration, to explore the potential of collagen membrane as FGF-2 carrier, and to determine the optimum FGF concentration for enhancement of bone regeneration. Four bone defects of 8mm in diameter were created in 18 New Zealand rabbit calvaria...
July 12, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28701034/a-site-cation-effect-on-growth-thermodynamics-and-photoconductive-properties-in-ultra-pure-lead-iodine-perovskite-monocrystalline-wires
#15
Ligang Wang, Yuan Huang, Aashir Waleed, Ke Wu, Cong Lin, Zhengxu Wang, Guanhaojie Zheng, Zhiyong Fan, Junliang Sun, Huanping Zhou, Lingdong Sun, Chun-Hua Yan
Among the various building blocks beyond polycrystalline thin films, perovskite wires have attracted extensive attention for potential applications including nano-lasers, wave-guides, field effect transistors, and more. In this work, millimeter-scale lead iodine-based perovskite wires employing various A-site substitutions, namely, Cs, methylammonium (MA), and formamidinium (FA), have been synthesized via a new type solution method with nearly 100% yield. All three millimeter-scale perovskite wires (MPWs) compositions exhibit relatively high quality, and CsPbI3 is proven to be monocrystalline along its entire length...
July 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28700916/a-reaction-diffusion-model-explains-amplification-of-the-plc-pkc-pathway-in-fibroblast-chemotaxis
#16
Krithika Mohan, Jamie L Nosbisch, Timothy C Elston, James E Bear, Jason M Haugh
During the proliferative phase of cutaneous wound healing, dermal fibroblasts are recruited into the clotted wound by a concentration gradient of platelet-derived growth factor (PDGF), together with other spatial cues. Despite the importance of this chemotactic process, the mechanisms controlling the directed migration of slow-moving mesenchymal cells such as fibroblasts are not well understood. Here, we develop and analyze a reaction-diffusion model of phospholipase C/protein kinase C (PKC) signaling, which was recently identified as a requisite PDGF-gradient-sensing pathway, with the goal of identifying mechanisms that can amplify its sensitivity in the shallow external gradients typical of chemotaxis experiments...
July 11, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28700705/cumulative-effects-of-prenatal-exposure-to-exogenous-chemicals-and-psychosocial-stress-on-fetal-growth-systematic-review-of-the-human-and-animal-evidence
#17
Hanna M Vesterinen, Rachel Morello-Frosch, Saunak Sen, Lauren Zeise, Tracey J Woodruff
BACKGROUND: Adverse effects of prenatal stress or environmental chemical exposures on fetal growth are well described, yet their combined effect remains unclear. OBJECTIVES: To conduct a systematic review on the combined impact and interaction of prenatal exposure to stress and chemicals on developmental outcomes. METHODS: We used the first three steps of the Navigation Guide systematic review. We wrote a protocol, performed a robust literature search to identify relevant animal and human studies and extracted data on developmental outcomes...
2017: PloS One
https://www.readbyqxmd.com/read/28699524/biohybrid-membrane-systems-for-testing-molecules-and-stem-cell-therapy-in-neuronal-tissue-engineering
#18
Sabrina Morelli, Antonella Piscioneri, Simona Salerno, Enrico Drioli, Loredana De Bartolo
Current research in neural tissue-engineering is focused on the development of advanced biomaterials for the creation of sophisticated neuro-tissue analogues, showing that mimicking the in vivo tissue disposition and functions is a useful tool for the study of brain-related issues in normal and pathological states. In addition, the most common approach for developing new drug therapies is to carry out in vitro investigation before in vivo test, thus, it is increasingly important to develop valuable models that can predict the results of in vivo studies...
July 10, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28699306/strategies-for-building-a-successful-ultrasound-guided-fna-practice-in-department-of-pathology-experience-at-a-university-hospital
#19
Maoxin Wu, Kenneth R Shroyer
INTRODUCTION: Although pathology services focused on fine needle aspiration (FNA) biopsy of superficial palpable masses with on-site cytological evaluation are available in a wide range of clinical and academic settings, the addition of ultrasound (US) guidance into FNA practice by a cytopathologist group can be challenging. An US-FNA service provided by a cytopathologist in the department of Pathology is a relatively new practice in the field of medicine. This report summarizes our experience and strategies in achieving this objective and our successful preliminary results...
July 11, 2017: Diagnostic Cytopathology
https://www.readbyqxmd.com/read/28699224/melt-electrospinning-writing-of-poly-hydroxymethylglycolide-co-%C3%AE%C2%B5-caprolactone-based-scaffolds-for-cardiac-tissue-engineering
#20
Miguel Castilho, Dries Feyen, María Flandes-Iparraguirre, Gernot Hochleitner, Jürgen Groll, Pieter A F Doevendans, Tina Vermonden, Keita Ito, Joost P G Sluijter, Jos Malda
Current limitations in cardiac tissue engineering revolve around the inability to fully recapitulate the structural organization and mechanical environment of native cardiac tissue. This study aims at developing organized ultrafine fiber scaffolds with improved biocompatibility and architecture in comparison to the traditional fiber scaffolds obtained by solution electrospinning. This is achieved by combining the additive manufacturing of a hydroxyl-functionalized polyester, (poly(hydroxymethylglycolide-co-ε-caprolactone) (pHMGCL), with melt electrospinning writing (MEW)...
July 12, 2017: Advanced Healthcare Materials
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