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https://www.readbyqxmd.com/read/28637351/tuning-surface-chemistry-of-polyetheretherketone-by-gold-coating-and-plasma-treatment
#1
Zdeňka Novotná, Silvie Rimpelová, Petr Juřík, Martin Veselý, Zdeňka Kolská, Tomáš Hubáček, Jakub Borovec, Václav Švorčík
Polyetheretherketone (PEEK) has good chemical and biomechanical properties that are excellent for biomedical applications. However, PEEK exhibits hydrophobic and other surface characteristics which cause limited cell adhesion. We have investigated the potential of Ar plasma treatment for the formation of a nanostructured PEEK surface in order to enhance cell adhesion. The specific aim of this study was to reveal the effect of the interface of plasma-treated and gold-coated PEEK matrices on adhesion and spreading of mouse embryonic fibroblasts...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28634590/the-immune-epitope-database-how-data-are-entered-and-retrieved
#2
REVIEW
Ward Fleri, Kerrie Vaughan, Nima Salimi, Randi Vita, Bjoern Peters, Alessandro Sette
Easy access to a vast collection of experimental data on immune epitopes can greatly facilitate the development of therapeutics and vaccines. The Immune Epitope Database and Analysis Resource (IEDB) was developed to provide such a resource as a free service to the biomedical research community. The IEDB contains epitope and assay information related to infectious diseases, autoimmune diseases, allergic diseases, and transplant/alloantigens for humans, nonhuman primates, mice, and any other species studied. It contains T cell, B cell, MHC binding, and MHC ligand elution experiments...
2017: Journal of Immunology Research
https://www.readbyqxmd.com/read/28634117/to-assess-the-effects-of-parathyroidectomy-tptx-versus-tptx-at-for-secondary-hyperparathyroidism-in-chronic-renal-failure-a-meta-analysis
#3
REVIEW
Nian-Cun Qiu, Si-Luo Zha, Miao-E Liu, Zhi-Peng Du, Yi-Fan Wang, Qiang Wang, Qi Chen, Ying Jiang, Cheng-Xiang Shan, Ming Qiu
BACKGROUND: Secondary Hyperparathyroidism (SHPT) requiring parathyroidectomy (PTX) occurs more commonly in patients with progressive chronic kidney disease and in those on long-term lithium therapy. Successful PTX often results in a dramatic drop of parathyroid hormone level, relieves the patient from clinical symptoms, and reduces mortality. However, there is an ongoing debate on the optimal surgical treatment of SHPT. Currently, no clinical guidelines or trials have definitely answered the question of whether Total Parathyroidectomy (TPTX) is superior or equal to Total Parathyroidectomy with Autotransplantation (TPTX + AT)...
June 17, 2017: International Journal of Surgery
https://www.readbyqxmd.com/read/28633930/phospholipase-a2-in-the-venom-of-three-cottonmouth-snake-species
#4
Ying Jia, Boris Ermolinsky, Aryana Garza, Daniele Provenzano
Two phospholipase A2s (PLA2s), Asp49 (D49) and Lys49 (K49), were purified by one-step reverse-phase high performance liquid chromatography (RP-HPLC) from the venom of each of the three subspecies of cottonmouth snake, Western cottonmouth (Agkistrodon piscivorus leucostoma; Apl), Eastern cottonmouth (Agkistrodon piscivorus piscivorus; App) and Florida cottonmouth (Agkistrodon piscivorus conanti; Apc). Venom protein profiles and PLA2s elution pattern of the three cottonmouth snakes were remarkably similar displaying four similar sharp and two wide peaks; in all cases K49 PLA2 eluted first followed by D49 PLA2...
June 17, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28633659/computing-patient-data-in-the-cloud-practical-and-legal-considerations-for-genetics-and-genomics-research-in-europe-and-internationally
#5
Fruzsina Molnár-Gábor, Rupert Lueck, Sergei Yakneen, Jan O Korbel
Biomedical research is becoming increasingly large-scale and international. Cloud computing enables the comprehensive integration of genomic and clinical data, and the global sharing and collaborative processing of these data within a flexibly scalable infrastructure. Clouds offer novel research opportunities in genomics, as they facilitate cohort studies to be carried out at unprecedented scale, and they enable computer processing with superior pace and throughput, allowing researchers to address questions that could not be addressed by studies using limited cohorts...
June 20, 2017: Genome Medicine
https://www.readbyqxmd.com/read/28633093/fracture-resistance-of-ceramic-and-polymer-based-occlusal-veneer-restorations
#6
Majed Al-Akhali, Mohamed Sad Chaar, Adham Elsayed, Abdulaziz Samran, Matthias Kern
OBJECTIVES: The purpose of this in vitro study was to evaluate the influence of thermodynamic loading on the durability and fracture resistance behavior of occlusal veneers fabricated from different biomedical dental CAD/CAM materials. METHODS: The occlusal surfaces of 64 extracted premolars were prepared in the enamel layer and restored with occlusal veneers with a fissure/cusp thickness of 0.5/0.8mm made from four different dental CAD/CAM materials: group LD lithium disilicate (e...
June 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28631059/trends-in-hiv-risk-testing-and-treatment-among-msm-in-chicago-2004-2014-implications-for-hiv-elimination-planning
#7
Ethan Morgan, Britt Skaathun, Nicola Lancki, Antonio D Jimenez, Jesus Ramirez-Valles, Ramona Bhatia, Stephanie Masiello-Schuette, Nanette Benbow, Nikhil Prachand, John A Schneider
Men who have sex with men (MSM) in the USA continue to have high rates of HIV infection. Increasingly, in addition to behavioral factors, biomedical interventions have been found to play important roles in HIV prevention. In this analysis, we used four waves of cross-sectional data (2004, 2008, 2011, and 2014) from the National HIV Behavioral Surveillance System (NHBS) to examine trends in key behaviors and biomedical interventions among MSM in Chicago (N = 3298). Logistic regression was used to determine changes in behaviors and use of biomedical interventions...
June 19, 2017: Journal of Urban Health: Bulletin of the New York Academy of Medicine
https://www.readbyqxmd.com/read/28629099/instrumental-methods-and-techniques-for-structural-and-physicochemical-characterization-of-biomaterials-and-bone-tissue-a-review
#8
REVIEW
Žarko Mitić, Aleksandra Stolić, Sanja Stojanović, Stevo Najman, Nenad Ignjatović, Goran Nikolić, Miroslav Trajanović
A review of recent advances in instrumental methods and techniques for structural and physicochemical characterization of biomaterials and bone tissue is presented in this paper. In recent years, biomaterials attracted great attention primarily because of the wide range of biomedical applications. This paper focuses on the practical aspects of instrumental methods and techniques that were most often applied (X-ray methods, vibrational spectroscopy (IR and Raman), magnetic-resonance spectroscopy (NMR and ESR), mass spectrometry (MS), atomic absorption spectrometry (AAS) and inductively coupled plasma-atomic emission spectrometry (ICP-AES), thermogravimetry (TG), differential thermal analysis (DTA) and differential scanning calorimetry (DSC), scanning electron microscopy (SEM), transmission electron microscopy (TEM)) in the structural investigation and physicochemical characterization of biomaterials and bone tissue...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629028/physicochemical-and-biological-assessment-of-peek-composites-embedding-natural-amorphous-silica-fibers-for-biomedical-applications
#9
Patrícia R Monich, Fernanda V Berti, Luismar M Porto, Bruno Henriques, Antonio P Novaes de Oliveira, Márcio C Fredel, Júlio C M Souza
The main aim of this study was to assess the physicochemical and biological properties of a novel poly(ether ether ketone) (PEEK) composite containing 30%wt natural amorphous silica fibers (NASF). PEEK and NASF powders were previously functionalized by atomization and citric acid in order to enhance adhesion between polymeric matrix and fillers. Then, composites were produced by cold compression molding technique at 350°C for 3h. Materials were characterized by chemical, microstructural, thermophysical, mechanical and cytotoxic analysis...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628999/synthesis-characterisation-and-phase-transition-behaviour-of-temperature-responsive-physically-crosslinked-poly-n-vinylcaprolactam-based-polymers-for-biomedical-applications
#10
Shane C Halligan, Maurice B Dalton, Kieran A Murray, Yixiao Dong, Wenxin Wang, John G Lyons, Luke M Geever
Poly (N-vinylcaprolactam) (PNVCL) is a polymer which offers superior characteristics for various potential medical device applications. In particular it offers unique thermoresponsive capabilities, which fulfils the material technology constraints required in targeted drug delivery applications. PNVCL phase transitions can be tailored in order to suit the requirements of current and next generation devices, by modifying the contents with regard to the material composition and aqueous polymer concentration. In this study, physically crosslinked Poly (N-vinylcaprolactam)-Vinyl acetate (PNVCL-VAc) copolymers were prepared by photopolymerisation...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28626425/lemons-or-squeezed-for-resources-information-symmetry-and-asymmetric-resources-in-biotechnology
#11
Arthur Neuberger, Nektarios Oraiopoulos, Donald L Drakeman
Thousands of biotech companies are developing promising products, but have insufficient resources to complete the clinical testing process, while large, well-funded companies have increasingly focused on the need to access external innovation. As a result, licensing deals are an essential and growing part of this industry. Yet, casting a shadow over the licensing market is the classic Lemons Problem: Does asymmetrical information put licensees at a severe disadvantage, leading to a market dominated by inferior opportunities, with the best products retained for internal development? Our analysis of clinical stage products developed over three decades shows that there is no Lemons Problem...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28625053/annotation-of-the-domestic-pig-genome-by-quantitative-proteogenomics
#12
Harald Marx, Hannes Hahne, Susanne E Ulbrich, Angelika Schnieke, Oswald Rottmann, Dimitrij Frishman, Bernhard Kuster
The pig is one of the earliest domesticated animals in the history of human civilization and represents one of the most important livestock animals. The recent sequencing of the Sus scrofa genome was a major step towards the comprehensive understanding of porcine biology, evolution and its utility as a promising large animal model for biomedical and xenotransplantation research. However, the functional and structural annotation of the Sus scrofa genome is far from complete. Here, we present mass spectrometry-based quantitative proteomics data of nine juvenile organs and six embryonic stages between 18 to 39 days after gestation...
June 19, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28625045/size-dependent-heating-of-magnetic-iron-oxide-nanoparticles
#13
Sheng Tong, Christopher A Quinto, Linlin Zhang, Priya Mohindra, Gang Bao
The ability to generate heat under an alternating magnetic field (AMF) makes magnetic iron oxide nanoparticles (MIONs) an ideal heat source for biomedical applications including cancer thermoablative therapy, tissue preservation, and remote control of cell function. However, there is a lack of quantitative understanding of the mechanisms governing heat generation of MIONs, and the optimal nanoparticle size for magnetic fluid heating (MFH) applications. Here, we show that MIONs with large sizes (>20 nm) have a specific absorption rate (SAR) significantly higher than that predicted by the widely used linear theory of MFH...
June 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28624620/agbr-nanoparticles-3d-nitrogen-doped-graphene-hydrogel-for-fabricating-all-solid-state-luminol-electrochemiluminescence-escherichia-coli-aptasensors
#14
Nan Hao, Xuan Zhang, Zhou Zhou, Rong Hua, Ying Zhang, Qian Liu, Jing Qian, Henan Li, Kun Wang
It is necessary to develop rapid, simple and accurate detection method for Escherichia coli (E. coli) due to its widely distributed pathogenic bacteria. Herein, we prepared AgBr nanoparticles (NPs) anchored 3D nitrogen-doped graphene hydrogel (3DNGH) nanocomposites with an exceptionally large accessible surface by a simple hydrothermal approach. The as-prepared 3DNGH porous nanocomposite not only showed better conductivity than that of 3D graphene due to introducing nitrogen element into graphene framework, but also provided a high loading volume for immobilizing luminol...
June 13, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28624457/effect-of-calcium-carbonate-particle-shape-on-phagocytosis-and-pro-inflammatory-response-in-differentiated-thp-1-macrophages
#15
Yosuke Tabei, Sakiko Sugino, Kenichiro Eguchi, Masahiko Tajika, Hiroko Abe, Yoshihiro Nakajima, Masanori Horie
Phagocytosis is a physiological process used by immune cells such as macrophages to actively ingest and destroy foreign pathogens and particles. It is the cellular process that leads to the failure of drug delivery carriers because the drug carriers are cleared by immune cells before reaching their target. Therefore, clarifying the mechanism of particle phagocytosis would have a significant implication for both fundamental understanding and biomedical engineering. As far as we know, the effect of particle shape on biological response has not been fully investigated...
June 14, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28624212/light-triggerable-liposomes-for-enhanced-endolysosomal-escape-and-gene-silencing-in-pc12-cells
#16
Wenjie Chen, Wei Deng, Ewa M Goldys
Liposomes are an effective gene and/or drug delivery system, widely used in biomedical applications including gene therapy and chemotherapy. Here, we designed a photo-responsive liposome (lipVP) loaded with a photosensitizer verteporfin (VP). This photosensitizer is clinically approved for photodynamic therapy (PDT). LipVP was employed as a DNA carrier for pituitary adenylyl cyclase-activating polypeptide (PACAP) receptor 1 (PAC1R) gene knockdown in PC12 cells. This has been done by incorporating PAC1R antisense oligonucleotides inside the lipVP cavity...
June 16, 2017: Molecular Therapy. Nucleic Acids
https://www.readbyqxmd.com/read/28623953/early-versus-late-initiation-of-renal-replacement-therapy-impacts-mortality-in-patients-with-acute-kidney-injury-post-cardiac-surgery-a-meta-analysis
#17
Honghong Zou, Qianwen Hong, Gaosi Xu
BACKGROUND: Acute kidney injury (AKI) is a common clinical complication of cardiac surgery and increases mortality and hospitalization. We aimed to explore and perform an updated meta-analysis of qualitative and quantitative evaluations of the relationship between early renal replacement therapy (RRT) and mortality. METHODS: We searched the Chinese Biomedical Database, the Cochrane Library, EMBASE, Global Health, MEDLINE and PubMed. RESULTS: Fifteen studies (five randomized controlled trials (RCTs), one prospective cohort and nine retrospective cohorts) including 1479 patients were identified for detailed evaluation...
June 17, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/28623821/green-biosynthesis-of-magnetic-iron-oxide-fe3o4-nanoparticles-using-the-aqueous-extracts-of-food-processing-wastes-under-photo-catalyzed-condition-and-investigation-of-their-antimicrobial-and-antioxidant-activity
#18
Jayanta Kumar Patra, Kwang-Hyun Baek
In this study, a simple, rapid, and eco-friendly green method was introduced to synthesize magnetite iron oxide nanoparticles (Fe3O4 NPs) using the aqueous extracts of two food processing wastes, namely silky hairs of corn (Zea mays L.) and outer leaves of Chinese cabbage (Brassica rapa L. subsp. pekinensis). The boiled solutions of silky hairs (MH) and outer leaves of Chinese cabbage (CCP) were used to synthesize Fe3O4 NPs under photo exposed condition. The MH-FeNPs and CCP-FeNPs synthesized via green route were characterized by UV-Vis spectroscopy, field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), differential thermogravimetric (TG/DTG) analysis, and vibrating sample magnetometer (VSM) analysis...
June 8, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28623182/mygenefriends-a-social-network-linking-genes-genetic-diseases-and-researchers
#19
Alexis Allot, Kirsley Chennen, Yannis Nevers, Laetitia Poidevin, Arnaud Kress, Raymond Ripp, Julie Dawn Thompson, Olivier Poch, Odile Lecompte
BACKGROUND: The constant and massive increase of biological data offers unprecedented opportunities to decipher the function and evolution of genes and their roles in human diseases. However, the multiplicity of sources and flow of data mean that efficient access to useful information and knowledge production has become a major challenge. This challenge can be addressed by taking inspiration from Web 2.0 and particularly social networks, which are at the forefront of big data exploration and human-data interaction...
June 16, 2017: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/28621440/t-lymphocytes-dominate-local-leukocyte-infiltration-in-response-to-intradermal-injection-of-functionalized-graphene-based-nanomaterial
#20
G F Erf, D M Falcon, K S Sullivan, S E Bourdo
Graphene-based nanomaterials (GBN) have many potential biomedical applications. However, information regarding their biological properties and interactions with cells and/or soluble factors within a complex tissue is limited. The objective of this study was to use the growing feather (GF) of chickens as a minimally invasive cutaneous test-site to assess and monitor leukocyte recruitment in response to intradermal GBN injection. Specifically, the dermis of 20 GFs per chicken was injected with 10 μl of phosphate-buffered saline (PBS)-vehicle or 10 μl of 300 μg ml(-1) oxygen-functionalized (f) GBN (6 chickens/treatment)...
June 16, 2017: Journal of Applied Toxicology: JAT
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