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https://www.readbyqxmd.com/read/28629478/genetic-epigenetic-interactions-in-cis-a-major-focus-in-the-post-gwas-era
#1
REVIEW
Catherine Do, Alyssa Shearer, Masako Suzuki, Mary Beth Terry, Joel Gelernter, John M Greally, Benjamin Tycko
Studies on genetic-epigenetic interactions, including the mapping of methylation quantitative trait loci (mQTLs) and haplotype-dependent allele-specific DNA methylation (hap-ASM), have become a major focus in the post-genome-wide-association-study (GWAS) era. Such maps can nominate regulatory sequence variants that underlie GWAS signals for common diseases, ranging from neuropsychiatric disorders to cancers. Conversely, mQTLs need to be filtered out when searching for non-genetic effects in epigenome-wide association studies (EWAS)...
June 19, 2017: Genome Biology
https://www.readbyqxmd.com/read/28629095/solvothermal-synthesis-of-hydroxyapatite-nanorods-with-assistance-of-green-polymer
#2
Hui Yang, Tongxiang Liang, Xiaopeng Qi, Honghui Jiang, Yiqun Deng, Ping Wang, Huichang Gao
Development of low cost, environmental friendly crystal growth modifying reagents that are effective to HAp's microstructure regulation is highly crucial. Herein, sodium lignin sulfonate (SS), a byproduct of the pulp process, was used for preparing HAp nanorods. Results showed that both stirring time of reaction solution and the concentration of SS affected crystals' structure and aspect ratio. The growth mechanism was discussed on the basis of the results. And we hope this new synthetic strategy will offer an attractive route for the design of functional HAp nano-/micro- materials with fine structure...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629092/binary-functional-porous-multi-mineral-substituted-apatite-nanoparticles-for-reducing-osteosarcoma-colonization-and-enhancing-osteoblast-cell-proliferation
#3
Dharman Govindaraj, Chandramohan Govindasamy, Mariappan Rajan
We investigated the use of combined nanoparticles in bone replacement for patients with bone cancer. Bismuth (Bi) is known to have antitumor effects, and the inclusion of Bi in bioactive mineral (M)-substituted hydroxyapatite (M-HAP) may provide anti-cancer properties implant resources. A series of Bi-substituted M-HAP (Bi-M-HAP) nanoparticles with various Bi concentrations was synthesized via the ultrasound irradiation method. The nanoparticles were examined using physicochemical strategies. The cell-substance interface of the nanoparticles was observed in vitro with human osteosarcoma cells and cell multiplication was measured at 1, 3, and 7days of incubation and in vivo in rats after 3weeks of implantation...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629016/effect-of-stearic-acid-modified-hap-nanoparticles-in-different-solvents-on-the-properties-of-pickering-emulsions-and-hap-plla-composites
#4
Ming Zhang, Ai-Juan Wang, Jun-Ming Li, Na Song
Stearic acid (Sa) was used to modify the surface properties of hydroxyapatite (HAp) in different solvents (water, ethanol or dichloromethane(CH2Cl2)). Effect of different solvents on the properties of HAp particles (activation ratio, grafting ratio, chemical properties), emulsion properties (emulsion stability, emulsion type, droplet morphology) as well as the cured materials (morphology, average pore size) were studied. FT-IR and XPS results confirmed the interaction occurred between stearic acid and HAp particles...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28626286/synergistic-effect-of-fluoride-and-laser-irradiation-for-the-inhibition-of-the-demineralization-of-dental-enamel
#5
Raymond Lee, Kenneth H Chan, Jamison Jew, Jacob C Simon, Daniel Fried
Both laser irradiation and fluoride treatment alone are known to provide increased resistance to acid dissolution. CO2 lasers tuned to a wavelength of 9.3 μm can be used to efficiently convert the carbonated hydroxyapatite of enamel to a much more acid resistant purer phase hydroxyapatite (HAP). Further studies have shown that fluoride application to HAP yields fluoroapatite (FAP) which is even more resistant against acid dissolution. Previous studies show that CO2 lasers and fluoride treatments interact synergistically to provide significantly higher protection than either method alone, but the mechanism of interaction has not been elucidated...
January 28, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28624864/the-clinical-significance-of-pneumonia-in-patients-with-respiratory-specimens-harbouring-multidrug-resistant-pseudomonas-aeruginosa-a-5-year-retrospective-study-following-5667-patients-in-four-general-icus
#6
B Borgatta, S Gattarello, C A Mazo, A T Imbiscuso, M N Larrosa, M Lujàn, J Rello
Pseudomonas aeruginosa is the leading cause of pneumonia in intensive care units (ICUs), with multidrug-resistant (MDR) strains posing a serious threat. The aim of this study was to assess the clinical relevance of MDR Pseudomonas isolates in respiratory clinical specimens. A 5-year retrospective observational study in four medical-surgical ICUs from a referral hospital was carried out. Of 5667 adults admitted to the ICU, 69 had MDR-PA in respiratory samples: 31 were identified as having pneumonia (HAP/VAP): 21 ventilator-associated pneumonia (VAP) and ten hospital-acquired pneumonia (HAP)...
June 17, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28619003/hydroxyapatite-as-a-nanomaterial-for-advanced-tissue-engineering-and-drug-therapy
#7
Juha Tuukkanen, Miho Nakamura
Hydroxyapatite (HAp) is a complicated ceramic material that varies between the way it appears in biological systems and how it is synthesized as various calcium phosphates. HAp varies in chemical composition of substituting atoms, crystallinity, grain size and electrical polarization. HAp can form solid to macro-, micro- and nanoporous structures. Also, particulate HAp can have highly porous structure. HAp can be used as coatings for metal implants in thicknesses from hundreds of microns down to hundreds of nanometers...
June 15, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28610827/il-6-and-crp-are-superior-in-early-differentiation-between-mild-and-non-mild-acute-pancreatitis
#8
Hanna Sternby, Hannes Hartman, Dorthe Johansen, Henrik Thorlacius, Sara Regnér
BACKGROUND: The revised Atlanta classification on acute pancreatitis (AP) presents distinct criteria for severity categorization. Due to the lack of reliable prognostic markers, a majority of patients with AP are currently hospitalized and initially managed identically. As incidence and financial costs are rising the need for early severity differentiation will increase. This study aimed to investigate the capacity of biomarkers to stratify AP patients during the initial course of the disease...
May 30, 2017: Pancreatology: Official Journal of the International Association of Pancreatology (IAP) ... [et Al.]
https://www.readbyqxmd.com/read/28610581/household-air-pollution-from-cooking-and-risk-of-adverse-health-and-birth-outcomes-in-bangladesh-a-nationwide-population-based-study
#9
Md Nuruzzaman Khan, Cherri Zhang B Nurs, M Mofizul Islam, Md Rafiqul Islam, Md Mizanur Rahman
BACKGROUND: Household air pollution (HAP) from cooking with solid fuels has become a leading cause of death and disability in many developing countries including Bangladesh. We assess the association between HAP and risk of selected adverse birth and maternal health outcomes. METHODS: Data for this study were extracted from Bangladesh Demographic and Health Survey conducted during 2007-2014. Selected adverse birth outcomes were acute respiratory infection (ARI) among children, stillbirth, low birth weight (LBW), under-five mortality, neonatal mortality and infant mortality...
June 13, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/28609663/investigation-of-nanotoxicological-effects-of-nanostructured-hydroxyapatite-to-microalgae-pseudokirchneriella-subcapitata
#10
Flávia F Pereira, Elaine C Paris, Joana D Bresolin, Milene M Foschini, Marcos D Ferreira, Daniel S Corrêa
The advance of nanotechnology has enabled the development of materials with optimized properties for applications in agriculture and environment. For instance, nanotechnology-based fertilizers, such as the candidate hydroxyapatite (HAp) nanoparticles (Ca10(PO4)6(OH)2), can potentially increase the food production by rationally supplying phosphorous to crops, although with inferior mobility in the environment (when compared to the soluble counterparts), avoiding eutrophication. Nonetheless, the widespread consumption of nanofertilizers also raises concern about feasible deleterious effects caused by their release in the environment, which ultimately imposes risks to aquatic biota and human health...
June 10, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28606542/hydroxyapatite-crystallization-in-shrimp-cephalothorax-wastes-during-subcritical-water-treatment-for-chitin-extraction
#11
Angélica Espíndola-Cortés, Rosario Moreno-Tovar, Lauro Bucio, Miquel Gimeno, José Luis Ruvalcaba-Sil, Keiko Shirai
The extraction of calcareous chitin from shrimp cephalothorax was successfully achieved using a subcritical water treatment to attain a deproteinization up to 96%. The treatments also increased the crystalline domain size in the α-chitin fibers. An experimental design of Taguchi allowed the optimization of experiments. The macroelements identified in all samples were Ca, P, S, K, Cl and Al, whereas Cr, Mn, Fe, Ni, Cu, Zn, Br and Sr were also detected as microelements. The assigned crystalline phases by XRD were α-chitin, calcite, HAP and traces of quartz...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28601789/hydroxyapatite-chemically-reduced-graphene-oxide-composite-environment-friendly-synthesis-and-high-performance-electrochemical-sensing-for-hydrazine
#12
Feng Gao, Qingxiang Wang, Ningning Gao, Yizhen Yang, Fuxian Cai, Mayoka Yamane, Fei Gao, Hidekazu Tanaka
It is unexpectedly found that, the in-situ growth of hydroxyapatite (HAP) on graphene oxide (GO) under a moderate temperature (85°C) can effectively trigger the reduction of GO, which needs neither extra reducing agents nor high-temperature thermal treatment. The transmission electron microscope (TEM) experiment demonstrates that the rod-like HAP particles are well attached on the surface of reduced GO (rGO) to form the composite. Electrochemical sensing assays show that the synthesized HAP-rGO nanocomposite presents excellent electrocatalytic capacity for the oxidation of a toxic chemical of hydrazine...
June 16, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28598722/improvement-of-mechanical-strength-and-osteogenic-potential-of-calcium-sulfate-based-hydroxyapatite-3-dimensional-printed-scaffolds-by-%C3%AE%C2%B5-polycarbonate-coating
#13
Beom-Su Kim, Sun-Sik Yang, Ho Park, Se-Hwan Lee, Young-Sam Cho, Jun Lee
Powder-based three-dimensional (3D) printing is an excellent method to fabricate complex-shaped scaffolds for tissue engineering. However, their lower mechanical strength restricts their application in bone tissue engineering. Here, we created a 3D-printed scaffold coated with a ε-polycaprolactone (PCL) polymer solution (5 and 10 w/v %) to improve the mechanical strength of the scaffold. The 3D scaffold was fabricated from calcium sulfate hemihydrate powder (CaSO4-1/2 H2O), transformed into hydroxyapatite (HAp) by treatment with a hydrothermal reaction in an NH4H2PO4 solution...
June 21, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28597815/dksa-hapr-rpos-axis-regulates-haemagglutinin-protease-production-in-vibrio-cholerae
#14
Pallabi Basu, Ritesh Ranjan Pal, Shreya Dasgupta, Rupak K Bhadra
DksA acts as a co-factor for the intracellular small signalling molecule ppGpp during the stringent response. We recently reported that the expression of the haemagglutinin protease (HAP), which is needed for shedding of the cholera pathogen Vibrio cholerae during the late phase of infection, is significantly downregulated in V. cholerae ∆dksA mutant (∆dksAVc) cells. So far, it has been shown that HAP production by V. cholerae cells is critically regulated by HapR and also by RpoS. Here, we provide evidence that V...
June 8, 2017: Microbiology
https://www.readbyqxmd.com/read/28595806/conversion-of-biowastes-to-biomaterial-an-innovative-waste-management-approach
#15
M Bobby Kannan, Karly Ronan
The study suggests that biowastes (eggshells and urine) can be potentially used as precursors to produce hydroxyapatite (HAp) biomaterial in a simple chemical process. A batch reactor was used in this work to produce HAp powder from eggshells and synthetic urine (SU). Fine powder of calcined eggshells was dissolved in water to produce aqueous calcium hydroxide. The solution was then mixed with concentrated SU in stoichiometric amounts corresponding to HAp (Ca/P molar ratio∼1.67). The initial pH of the solution was alkaline (pH∼8...
June 5, 2017: Waste Management
https://www.readbyqxmd.com/read/28589496/screening-of-autism-spectrum-disorders-in-geriatric-psychiatry
#16
S M J Heijnen-Kohl, R M Kok, R M H J Wilting, G Rossi, S P J van Alphen
Autism spectrum disorders (ASD) are difficult to detect in old age. This study examined if ASD symptoms in older adults (age > 60) can be detected with the Dutch informant personality questionnaire, (Hetero-Anamnestische Persoonlijkheidsvragenlijst, HAP) in a mental health setting. Patients with ASD (N = 40) were compared to patients with a different psychiatric diagnosis (N = 43; personality disorders excluded). The ASD group had significant higher scores on the scales 'Socially avoidant behavior', 'Rigid behavior' and 'Unpredictable and impulsive behavior'...
June 6, 2017: Journal of Autism and Developmental Disorders
https://www.readbyqxmd.com/read/28588141/tetragonal-ch3nh3pbi3-is-ferroelectric
#17
Yevgeny Rakita, Omri Bar-Elli, Elena Meirzadeh, Hadar Kaslasi, Yagel Peleg, Gary Hodes, Igor Lubomirsky, Dan Oron, David Ehre, David Cahen
Halide perovskite (HaP) semiconductors are revolutionizing photovoltaic (PV) solar energy conversion by showing remarkable performance of solar cells made with HaPs, especially tetragonal methylammonium lead triiodide (MAPbI3). In particular, the low voltage loss of these cells implies a remarkably low recombination rate of photogenerated carriers. It was suggested that low recombination can be due to the spatial separation of electrons and holes, a possibility if MAPbI3 is a semiconducting ferroelectric, which, however, requires clear experimental evidence...
June 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28587317/designed-synthesis-of-nanostructured-magnetic-hydroxyapatite-based-drug-nanocarrier-for-anti-cancer-drug-delivery-toward-the-treatment-of-human-epidermoid-carcinoma
#18
Bharath Govindan, Beeseti Swarna Latha, Ponpandian Nagamony, Faheem Ahmed, Muheet Alam Saifi, Abdel Halim Harrath, Saleh Alwasel, Lamjed Mansour, Edreese H Alsharaeh
Superparamagnetic Fe₃O₄ nanoparticles on hydroxyapatite nanorod based nanostructures (Fe₃O₄/HAp) were synthesized using hydrothermal techniques at 180 °C for 12 h and were used as drug delivery nanocarriers for cancer cell therapeutic applications. The synthesized Fe₃O₄/HAp nanocomposites were characterized by X-ray diffraction analysis (XRD), Field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET)-analysis, and vibrating sample magnetometry (VSM)...
June 6, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28585833/energetic-basis-for-inhibition-of-calcium-phosphate-biomineralization-by-osteopontin
#19
Meng Li, Lijun Wang, Christine V Putnis
Calcium oxalate kidney stones form attached to Randall's plaques (RP), calcium phosphate (Ca-P) deposits on the renal papillary surface. Osteopontin (OPN) suppresses crystal growth in the complex process of urinary stone formation, but the inhibitory role of active domains of OPN involved in the initial formation of the RPs attached to epithelial cells has yet to be clarified. Here we demonstrate the thermodynamic basis for how OPN sequences regulate the onset of Ca-P mineral formation on lipid rafts as a model membrane...
June 6, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28585518/the-synergistic-effect-of-micro-nano-structured-and-cu-2-doped-hydroxyapatite-particles-to-promote-osteoblast-viability-and-antibacterial-activity
#20
Feng Shi, Yumei Liu, Wei Zhi, Dongqin Xiao, Hongyu Li, Ke Duan, Shuxin Qu, Jie Weng
Microstructure and chemical constitution are important factors affecting the biological activity of biomaterials. This study aimed to fabricate hydroxyapatite (HAp) particles with both micro/nanohybrid structure and Cu(2+) doping to promote osteogenic differentiation and antibacterial property. In the presence of inositol hexakisphosphate (IP6), micro/nano-structured and Cu(2+)-doped HAp (HAp-IP6-Cu) microspheres were successfully fabricated via hydrothermal method. Morphological observation showed that HAp-IP6-Cu microspheres with a diameter of 3...
June 6, 2017: Biomedical Materials
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