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Remineralization

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https://www.readbyqxmd.com/read/28334391/sediment-anoxia-limits-microbial-driven-seagrass-carbon-remineralization-under-warming-conditions
#1
Stacey M Trevathan-Tackett, Justin R Seymour, Daniel A Nielsen, Peter I Macreadie, Thomas C Jeffries, Jonathan Sanderman, Jeff Baldock, Johanna M Howes, Andrew D L Steven, Peter Ralph
Seagrass ecosystems are significant carbon sinks, and their resident microbial communities ultimately determine the quantity and quality of carbon sequestered. However, environmental perturbations have been predicted to affect microbial-driven seagrass decomposition and subsequent carbon sequestration. Utilizing techniques including 16S-rDNA sequencing, solid-state NMR and microsensor profiling, we tested the hypothesis that elevated seawater temperatures and eutrophication enhance the microbial decomposition of seagrass leaf detritus and rhizome/root tissues...
March 15, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28326069/different-bacterial-communities-involved-in-peptide-decomposition-between-normoxic-and-hypoxic-coastal-waters
#2
Shuting Liu, Boris Wawrik, Zhanfei Liu
Proteins and peptides are key components of the labile dissolved organic matter pool in marine environments. Knowing which types of bacteria metabolize peptides can inform the factors that govern peptide decomposition and further carbon and nitrogen remineralization in marine environments. A (13)C-labeled tetrapeptide, alanine-valine-phenylalanine-alanine (AVFA), was added to both surface (normoxic) and bottom (hypoxic) seawater from a coastal station in the northern Gulf of Mexico for a 2-day incubation experiment, and bacteria that incorporated the peptide were identified using DNA stable isotope probing (SIP)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28322218/remineralization-of-particulate-organic-carbon-in-an-ocean-oxygen-minimum-zone
#3
E L Cavan, M Trimmer, F Shelley, R Sanders
Biological oceanic processes, principally the surface production, sinking and interior remineralization of organic particles, keep atmospheric CO2 lower than if the ocean was abiotic. The remineralization length scale (RLS, the vertical distance over which organic particle flux declines by 63%, affected by particle respiration, fragmentation and sinking rates) controls the size of this effect and is anomalously high in oxygen minimum zones (OMZ). Here we show in the Eastern Tropical North Pacific OMZ 70% of POC remineralization is due to microbial respiration, indicating that the high RLS is the result of lower particle fragmentation by zooplankton, likely due to the almost complete absence of zooplankton particle interactions in OMZ waters...
March 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28296648/salivary-acquired-pellicle-inspired-dpspseekc-peptide-for-the-restoration-of-demineralized-tooth-enamel
#4
Yinxin Yang, Bo Yang, Mingze Li, Yaning Wang, Xiao Yang, Jianshu Li
Salivary acquired pellicle (SAP) is a layer of proteins and glycoproteins of salivary origin that tightly coat the tooth surface. Statherin is an important part of the SAP. The initial six-peptide sequence DpSpSEEK (where pS denotes phosphorylated serine) of the N-terminus of statherin can be immobilized on a hydroxyapatite (HAP) surface and the negatively charged domains of the DpSpSEEK side chain can catch free Ca(2+) in saliva due to the charge adsorption effect. In order to prepare more functional materials based on DpSpSEEK, we designed a cysteine-labeled peptide sequence DpSpSEEKC, which could conjugate other macromolecules by forming a sulfur-based linkage...
March 15, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28292334/in-vivo-effect-of-calcium-hydroxide-and-resin-modified-glass-ionomer-cement-on-carious-dentin-in-young-permanent-molars-an-ultrastructural-and-macroscopic-study
#5
Shireen Opal, Shalini Garg, Deepak Sharma, Abhishek Dhindsa, Isha Jatana
PURPOSE: The purpose of this study was to evaluate macroscopically and ultrastructurally the effect of calcium hydroxide cement (CH) and resin-modified glass ionomer cement (RMGIC) compared with gutta percha (control) as a lining material on carious dentin after partial caries removal and sealing. METHODS: Twenty-seven permanent molars with deep carious lesions underwent partial caries removal with the application of CH, RMGIC, or gutta percha (control) and were then sealed for three months...
January 15, 2017: Pediatric Dentistry
https://www.readbyqxmd.com/read/28288296/effect-of-cpp-acp-or-a-potassium-nitrate-sodium-fluoride-dentifrice-on-enamel-erosion-prevention
#6
F I Zawaideh, A I Owais, S Mushtaha
AIM: To investigate in situ/ex vivo the effect of remineralizing agents in the prevention of dental erosion in permanent and primary teeth. STUDY DESIGN: A randomized, controlled, double-blind study with crossover design with three treatment phases: Control, ProNamel(®) and Tooth Mousse(™). Twenty adults and children wore removable palatal appliances containing two insets of permanent and primary human enamel and used the corresponding assigned toothpaste twice daily for 10 days...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28286496/response-of-bacterial-communities-to-different-detritus-compositions-in-arctic-deep-sea-sediments
#7
Katy Hoffmann, Christiane Hassenrück, Verena Salman-Carvalho, Moritz Holtappels, Christina Bienhold
Benthic deep-sea communities are largely dependent on particle flux from surface waters. In the Arctic Ocean, environmental changes occur more rapidly than in other ocean regions, and have major effects on the export of organic matter to the deep sea. Because bacteria constitute the majority of deep-sea benthic biomass and influence global element cycles, it is important to better understand how changes in organic matter input will affect bacterial communities at the Arctic seafloor. In a multidisciplinary ex situ experiment, benthic bacterial deep-sea communities from the Long-Term Ecological Research Observatory HAUSGARTEN were supplemented with different types of habitat-related detritus (chitin, Arctic algae) and incubated for 23 days under in situ conditions...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28281957/effects-of-remineralization-agents-on-artificial-carious-lesions
#8
Selcuk Savas, Ebru Kucukyilmaz, Esra Uzer Celik
PURPOSE: The purpose of this study was to evaluate the remineralization potentials of different agents on demineralized enamel surfaces. METHODS: Four hundred and sixty extracted human molars with artificial carious lesions were divided into six groups: (1) control; (2) acidulated phosphate fluoride (APF); (3) Curodont Repair (CR); (4) silver diamine fluoride (SDF); (5) ammonium hexafluorosilicate (SiF); and (6) SiF plus cetylpiridinium chloride (SiF+CPC). They were subdivided according to immersion periods (seven out of 30 days)...
November 15, 2016: Pediatric Dentistry
https://www.readbyqxmd.com/read/28275354/in-vitro-acid-mediated-initial-dental-enamel-loss-is-associated-with-genetic-variants-previously-linked-to-caries-experience
#9
Alexandre R Vieira, Merve Bayram, Figen Seymen, Regina C Sencak, Frank Lippert, Adriana Modesto
We have previously shown that AQP5 and BTF3 genetic variation and expression in whole saliva are associated with caries experience suggesting that these genes may have a functional role in protecting against caries. To further explore these results, we tested ex vivo if variants in these genes are associated with subclinical dental enamel mineral loss. DNA and enamel samples were obtained from 53 individuals. Enamel samples were analyzed for Knoop hardness of sound enamel, integrated mineral loss after subclinical carious lesion creation, and change in integrated mineral loss after remineralization...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28270154/pandemics-pathogenicity-and-changing-molecular-epidemiology-of-cholera-in-the-era-of-global-warming
#10
REVIEW
Fazle Rabbi Chowdhury, Zannatun Nur, Nazia Hassan, Lorenz von Seidlein, Susanna Dunachie
BACKGROUND: Vibrio cholerae, a Gram-negative, non-spore forming curved rod is found in diverse aquatic ecosystems around the planet. It is classified according to its major surface antigen into around 206 serogroups, of which O1 and O139 cause epidemic cholera. A recent spatial modelling technique estimated that around 2.86 million cholera cases occur globally every year, and of them approximately 95,000 die. About 1.3 billion people are currently at risk of infection from cholera. Meta-analysis and mathematical modelling have demonstrated that due to global warming the burden of vector-borne diseases like malaria, leishmaniasis, meningococcal meningitis, viral encephalitis, dengue and chikungunya will increase in the coming years in the tropics and beyond...
March 7, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28261179/characterization-of-potential-polysaccharide-utilization-systems-in-the-marine-bacteroidetes-gramella-flava-jlt2011-using-a-multi-omics-approach
#11
Kai Tang, Yingfan Lin, Yu Han, Nianzhi Jiao
Members of phylum Bacteroidetes are distributed across diverse marine niches and Flavobacteria is often the predominant bacterial class decomposing algae-derived polysaccharides. Here, we report the complete genome of Gramella flava JLT2011 (Flavobacteria) isolated from surface water of the southeastern Pacific. A remarkable genomic feature is that the number of glycoside hydrolase (GH) genes in the genome of G. flava JLT2011 is more than 2-fold higher than that of other Gramella species. The functional profiles of the GHs suggest extensive variation in Gramella species...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28259311/therapies-for-white-spot-lesions-a-systematic-review
#12
REVIEW
Anabela Baptista Pereira Paula, Ana Rita Fernandes, Ana Sofia Coelho, Carlos Miguel Marto, Manuel Marques Ferreira, Francisco Caramelo, Francisco do Vale, Eunice Carrilho
INTRODUCTION: The first sign of dental caries is denoted by white spot lesions (WSLs) which can be defined as a demineralization of the enamel surface and subsurface, although these lesions can be reversed and do not form cavities. The aim of this systematic review was investigate which remineralization agents are effective for the treatment of WSLs. MATERIALS AND METHODS: For this systematic review a literature search was conducted on Pubmed, Cochrane Library and ScienceDirect...
March 2017: Journal of Evidence-based Dental Practice
https://www.readbyqxmd.com/read/28258713/toothbrushing-duration-and-dentifrice-dosage-are-associated-with-remineralization-of-enamel-specimens
#13
Romina Brignardello-Petersen
No abstract text is available yet for this article.
March 1, 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/28257221/preservation-in-young-patients-of-pulp-vitality-and-anatomical-functional-restoration-of-the-lost-structure
#14
Carlos Andres Villavicencio Espinoza, Juan Fernando Ordoñez Aguilera, Fabio Antonio Piola Rizzante, Rafael Massunari Maenosono, Eduardo Batista Franco, Sérgio Kiyoshi Ishikiriama
Often, young patients (≤30 years old) present with carious lesions that progress acutely, compromising a large amount of tooth structure. In these cases, a treatment to prevent the occurrence of pulp exposure and promote remineralization of caries-affected dentin is necessary to maintain healthy dental structure and allow more conservative interventions. The approach will be different when pulp exposure occurs: The therapeutic treatments will be focused on reparative dentin formation and prevention of microorganisms penetrating the pulp organ...
March 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/28249547/clinical-presentations-of-below-knee-bone-metastases-a-case-series
#15
Matthew Choi, Linda Probyn, Leigha Rowbottom, Rachel McDonald, Adam Bobrowski, Stephanie Chan, Pearl Zaki, Angela Turner, Edward Chow
Bone metastases are a common complication of advanced malignancy; however, presentation of below-the-knee metastases, particularly affecting the fibula and tibia, are infrequently observed in both the clinical setting and the literature, and present a therapeutic challenge to patients and physicians alike. Due to the weight-bearing capacity of bones below-the-knee, the disruption of the structural and functional integrity of these bones can reduce mobility and thus quality of life. Treatment options for these patients include surgery, radiotherapy, and/or chemotherapy...
February 10, 2017: Annals of Palliative Medicine
https://www.readbyqxmd.com/read/28247537/in-vitro-efficacy-of-a-novel-potassium-oxalate-hydrogel-for-dentin-hypersensitivity
#16
Elena M Varoni, Tommaso Zuccheri, Andrea Carletta, Barbara Palazzo, Andrea Cochis, Martino Colonna, Lia Rimondini
A novel potassium oxalate-based hydrogel is proposed for treating dentin hypersensitivity and this study evaluates its in vitro performance as a remineralizing, desensitizing agent. Etched disks of human dentin were treated for 10 or 20 min using the test hydrogel, to mimic a professional application with dental mouth guards. Dentin disks were evaluated in terms of permeability indexes in a fluid-filled system, the surface morphology was assessed by scanning electron microscopy, and the structural properties were studied using X-ray diffraction analysis...
March 1, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/28246637/hypoxia-causes-preservation-of-labile-organic-matter-and-changes-seafloor-microbial-community-composition-black-sea
#17
Gerdhard L Jessen, Anna Lichtschlag, Alban Ramette, Silvio Pantoja, Pamela E Rossel, Carsten J Schubert, Ulrich Struck, Antje Boetius
Bottom-water oxygen supply is a key factor governing the biogeochemistry and community composition of marine sediments. Whether it also determines carbon burial rates remains controversial. We investigated the effect of varying oxygen concentrations (170 to 0 μM O2) on microbial remineralization of organic matter in seafloor sediments and on community diversity of the northwestern Crimean shelf break. This study shows that 50% more organic matter is preserved in surface sediments exposed to hypoxia compared to oxic bottom waters...
February 2017: Science Advances
https://www.readbyqxmd.com/read/28243757/effect-of-the-addition-of-nano-sized-sodium-hexametaphosphate-to-fluoride-toothpastes-on-tooth-demineralization-an-in-vitro-study
#18
Giovanna Dalpasquale, Alberto Carlos Botazzo Delbem, Juliano Pelim Pessan, Gabriel Pereira Nunes, Luiz Fernando Gorup, Francisco Nunes Souza Neto, Emerson Rodrigues de Camargo, Marcelle Danelon
OBJECTIVE: This study evaluated the effect of toothpastes containing 1100 ppm F associated with nano-sized sodium hexametaphosphate (HMPnano) on enamel demineralization in vitro using a pH-cycling model. DESIGN: Bovine enamel blocks (4 mm × 4 mm, n = 72) selected by initial surface hardness (SHi) were randomly allocated into six groups (n = 12), according to the test toothpastes: without fluoride or HMPnano (Placebo), 550 ppm F (550F), 1100 ppm F (1100F), 1100F plus HMPnano at concentrations of 0...
February 28, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28240368/extensive-remineralization-of-large-pelvic-lytic-lesions-following-total-therapy-treatment-in-patients-with-multiple-myeloma
#19
Meera Mohan, Rohan S Samant, Donghoon Yoon, Amy F Buros, Antonio Branca, Corey O Montgomery, Richard Nicholas, Larry J Suva, Roy Morello, Sharmilan Thanendrarajan, Carolina Schinke, Shmuel Yaccoby, Frits van Rhee, Faith E Davies, Gareth J Morgan, Maurizio Zangari
Osteolytic bone lesions are a hallmark of multiple myeloma bone disease. Bone destruction is associated with severely imbalanced bone remodeling, secondary to increased osteoclastogenesis and significant osteoblast suppression. Lytic lesions of the pelvis are relatively common in MM patients and are known to contribute to the increased morbidity due to the high risk of fracture that frequently demands extensive surgical intervention.After observing unexpected radiological improvement in serial large pelvic CT assessment in a patient treated in a total therapy protocol, the radiographic changes of pelvic osteolytic lesions by CT/PET scanning in patients who received total therapy 4 treatment for myeloma were retrospectively analyzed...
February 27, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28223198/novel-bioactive-root-canal-sealer-to-inhibit-endodontic-multispecies-biofilms-with-remineralizing-calcium-phosphate-ions
#20
Lin Wang, Xianju Xie, Chunyan Li, Huaibing Liu, Ke Zhang, Yanmin Zhou, Xiaofeng Chang, Hockin H K Xu
OBJECTIVE: The objectives of this study were to: (1) develop a bioactive endodontic sealer via dimethylaminohexadecyl methacrylate (DMAHDM), 2-methacryloyloxyethyl phosphorylcholine (MPC) and nanoparticles of amorphous calcium phosphate (NACP) for the first time; and (2) evaluate inhibition of early-stage and mature multispecies endodontic biofilm, bond strength to root canal dentin, and calcium (Ca) and phosphate (P) ion release. METHODS: A series of bioactive endodontic sealers were formulated with DMAHDM, MPC, and NACP...
February 18, 2017: Journal of Dentistry
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