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https://www.readbyqxmd.com/read/28725144/comparative-study-of-antioxidant-activity-and-validated-rp-hptlc-analysis-of-rutin-in-the-leaves-of-different-acacia-species-grown-in-saudi-arabia
#1
Perwez Alam, Mohamed F Alajmi, Ahmed H Arbab, Mohammad K Parvez, Nasir A Siddiqui, Saleh I Alqasoumi, Adnan J Al-Rehaily, Mohammed S Al-Dosari, Omer A Basudan
The present study assessed the comparative antioxidant potential of the ethanol extract (EE) of leaves of four Acacia species (Acacia salicina, AS; Acacia laeta, AL; Acacia hamulosa AH; and Acacia tortilis, AT) grown in Saudi Arabia, including RP-HPTLC quantification of antioxidant biomarker rutin. In vitro DPPH radical scavenging and β-carotene-linoleic acid bleaching assays showed the promising antioxidant activities of Acacia extracts: ASEE (IC50: 60.39 and 324.65 μg/ml) >ALEE (IC50: 217.06 and 423...
July 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28718649/ensemble-and-single-particle-fluorescence-characterization-of-dye-labeled-cellulose-nanocrystals
#2
Tianyang Leng, Zygmunt J Jakubek, Mahyar Mazloumi, Alfred C W Leung, Linda J Johnston
Cellulose nanocrystals (CNCs) have been covalently labeled with both fluorescein and rhodamine and studied by a combination of UV-Vis absorption spectroscopy and ensemble and single molecule fluorescence spectroscopy. For all samples the fluorescence anisotropy and lifetimes were consistent with effects expected for covalently bound dye molecules. Low dye loading levels (~ 0.1 dye/particle) were estimated for the fluorescein-labeled CNC which coupled with the strong pH dependence make this a less suitable fluorophore for most applications...
July 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28717632/effect-of-different-intracoronal-bleaching-methods-on-shear-bond-strength-of-ceramic-brackets-bonded-to-bleached-enamel-an-in-vitro-study
#3
Vikas Chauhan, Piush Kumar, Payal Sharma, Divya Shetty
OBJECTIVE: To investigate the effect of different intracoronal bleaching methods on the shear bond strength and site of failure of ceramic brackets. MATERIALS AND METHODS: Sixty freshly extracted human maxillary incisors were randomly divided into four groups (n = 15). Endodontic access cavity was prepared and root canals were filled, root fillings were removed 2mm apical to the cementoenamel junction, and a 2-mmthick layer of glass ionomer cement base was applied...
July 2017: Journal of Orthodontic Science
https://www.readbyqxmd.com/read/28717563/multiphoton-in-vivo-imaging-with-a-femtosecond-semiconductor-disk-laser
#4
Fabian F Voigt, Florian Emaury, Philipp Bethge, Dominik Waldburger, Sandro M Link, Stefano Carta, Alexander van der Bourg, Fritjof Helmchen, Ursula Keller
We use an ultrafast diode-pumped semiconductor disk laser (SDL) to demonstrate several applications in multiphoton microscopy. The ultrafast SDL is based on an optically pumped Vertical External Cavity Surface Emitting Laser (VECSEL) passively mode-locked with a semiconductor saturable absorber mirror (SESAM) and generates 170-fs pulses at a center wavelength of 1027 nm with a repetition rate of 1.63 GHz. We demonstrate the suitability of this laser for structural and functional multiphoton in vivo imaging in both Drosophila larvae and mice for a variety of fluorophores (including mKate2, tdTomato, Texas Red, OGB-1, and R-CaMP1...
July 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28713348/engineering-strategies-to-decode-and-enhance-the-genomes-of-coral-symbionts
#5
Rachel A Levin, Christian R Voolstra, Shobhit Agrawal, Peter D Steinberg, David J Suggett, Madeleine J H van Oppen
Elevated sea surface temperatures from a severe and prolonged El Niño event (2014-2016) fueled by climate change have resulted in mass coral bleaching (loss of dinoflagellate photosymbionts, Symbiodinium spp., from coral tissues) and subsequent coral mortality, devastating reefs worldwide. Genetic variation within and between Symbiodinium species strongly influences the bleaching tolerance of corals, thus recent papers have called for genetic engineering of Symbiodinium to elucidate the genetic basis of bleaching-relevant Symbiodinium traits...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28713111/effect-of-hydrogen-and-carbamide-peroxide-in-bleaching-enamel-morphology-and-mineral-composition-in-vitro-study
#6
Carmen Llena, Irene Esteve, Leopoldo Forner
AIM: The aim of the study was to evaluate the bleaching effect, morphological changes, and variations in calcium (Ca) and phosphate (P) in the enamel with hydrogen peroxide (HP) and carbamide peroxide (CP) after the use of different application regimens. MATERIALS AND METHODS: Four groups of five teeth were randomly assigned, according to the treatment protocol: HP 37.5% applied for 30 or 60 minutes (HP30, HP60), CP 16% applied for 14 or 28 hours (CP14, CP28). Changes in dental color were evaluated, according to the following formula: ΔE = [(La-Lb)(2)+(aa-ab)(2) + (ba-bb)(2)](1/2)...
July 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28712152/teeth-bleaching-with-low-concentrations-of-hydrogen-peroxide-6-and-catalyzed-by-led-blue-450%C3%A2-%C3%A2-%C3%A2-10-nm-and-laser-infrared-808%C3%A2-%C3%A2-%C3%A2-10-nm-light-for-in-office-treatment-randomized-clinical-trial-1-year-follow-up
#7
Patricio Vildósola, Jessica Bottner, Francisca Avalos, Isidora Godoy, Javier Martín, Eduardo Fernández
OBJECTIVES: The aim of this study was to evaluate color longevity after a year of in-office bleaching with gel (6% hydrogen peroxide HP, LED blue/laser infrared activation system) compared to a 35% control concentration in a split-mouth study model. MATERIALS AND METHODS: Thirty-one patients were initially treated. The bleaching procedure with 6% or 35% gel HP was performed randomly in the upper half arcade of each patient. The color was measured at baseline and at 1 week, 1 month, and 1 year using the spectrophotometer Vita Easyshade, Vita Bleached, and Vita classical Shade guide organized by value...
July 16, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28709126/effects-of-increasing-temperature-alone-and-combined-with-copper-exposure-on-biochemical-and-physiological-parameters-in-the-zooxanthellate-scleractinian-coral-mussismilia-harttii
#8
Juliana da Silva Fonseca, Laura Fernandes de Barros Marangoni, Joseane Aparecida Marques, Adalto Bianchini
Effects of increasing temperature alone and in combination with exposure to dissolved copper (Cu) were evaluated in the zooxanthellate scleractinian coral Mussismilia harttii using a marine mesocosm system. Endpoints analyzed included parameters involved in metabolism [maximum photosynthetic capacity of zooxanthellae (Fv/Fm), chlorophyll a and ATP concentrations], calcification [carbonic anhydrase (CA) and Ca(2+)-Mg(2+)-ATPase activity], and oxidative status [antioxidant capacity against peroxyl radicals (ACAP) and lipid peroxidation (LPO)]...
July 8, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28706511/exoproteome-analysis-of-the-seaweed-pathogen-nautella-italica-r11-reveals-temperature-dependent-regulation-of-rtx-like-proteins
#9
Melissa Gardiner, Adam M Bournazos, Claudia Maturana-Martinez, Ling Zhong, Suhelen Egan
Climate fluctuations have been linked to an increased prevalence of disease in seaweeds, including the red alga Delisea pulchra, which is susceptible to a bleaching disease caused by the bacterium Nautella italica R11 under elevated seawater temperatures. To further investigate the role of temperature in the induction of disease by N. italica R11, we assessed the effect of temperature on the expression of the extracellular proteome (exoproteome) in this bacterium. Label-free quantitative mass spectrometry was used to identify 207 proteins secreted into supernatant fraction, which is equivalent to 5% of the protein coding genes in the N...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28706206/identification-of-long-non-coding-rnas-in-two-anthozoan-species-and-their-possible-implications-for-coral-bleaching
#10
Chen Huang, Jean-Étienne R L Morlighem, Jing Cai, Qiwen Liao, Carlos Daniel Perez, Paula Braga Gomes, Min Guo, Gandhi Rádis-Baptista, Simon Ming-Yuen Lee
Long non-coding RNAs (lncRNAs) have been shown to play regulatory roles in a diverse range of biological processes and are associated with the outcomes of various diseases. The majority of studies about lncRNAs focus on model organisms, with lessened investigation in non-model organisms to date. Herein, we have undertaken an investigation on lncRNA in two zoanthids (cnidarian): Protolpalythoa varibilis and Palythoa caribaeorum. A total of 11,206 and 13,240 lncRNAs were detected in P. variabilis and P. caribaeorum transcriptome, respectively...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28705429/disinfection-of-tonometers-a-report-by-the-american-academy-of-ophthalmology
#11
Anna K Junk, Philip P Chen, Shan C Lin, Kouros Nouri-Mahdavi, Sunita Radhakrishnan, Kuldev Singh, Teresa C Chen
OBJECTIVE: To examine the efficacy of various disinfection methods for reusable tonometer prisms in eye care and to highlight how disinfectants can damage tonometer tips and cause subsequent patient harm. METHODS: Literature searches were conducted last in October 2016 in the PubMed and the Cochrane Library databases for original research investigations. Reviews, non-English language articles, nonophthalmology articles, surveys, and case reports were excluded. RESULTS: The searches initially yielded 64 unique citations...
July 11, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28704664/a-primary-estimation-of-pcdd-fs-release-reduction-from-non-wood-pulp-and-paper-industry-in-china-based-on-the-investigation-of-pulp-bleaching-with-chlorine-converting-to-chlorine-dioxide
#12
Qingcong Xiao, Xiaoqian Song, Wenchao Li, Yuanna Zhang, Hongchen Wang
Chlorine bleaching technology (C process, CEH process, H process and theirs combination), which was identified as a primary formation source of PCDD/Fs, is still widely used by the vast majority of Chinese non-wood pulp and paper mills (non-wood PMs). The purpose of this study was to provide information and data support for further eliminating dioxin for non-wood PMs in China, and especially to evaluate the PCDD/Fs release reduction for those mills converting their pulp bleaching processes from CEH to ECF. The PCDD/Fs concentrations of the bleached pulp and bleaching wastewater with ECF bleaching were in the ranges of 0...
June 29, 2017: Chemosphere
https://www.readbyqxmd.com/read/28700348/mechanisms-of-phosphenes-in-irradiated-patients
#13
REVIEW
Thibaud Mathis, Stephane Vignot, Cecila Leal, Jean-Pierre Caujolle, Celia Maschi, Martine Mauget-Faÿsse, Laurent Kodjikian, Stéphanie Baillif, Joel Herault, Juliette Thariat
Anomalous visual perceptions have been reported in various diseases of the retina and visual pathways or can be experienced under specific conditions in healthy individuals. Phosphenes are perceptions of light in the absence of ambient light, occurring independently of the physiological and classical photonic stimulation of the retina. They are a frequent symptom in patients irradiated in the region of the central nervous system (CNS), head and neck and the eyes. Phosphenes have historically been attributed to complex physical phenomena such as Cherenkov radiation...
June 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28699164/novel-amino-acid-based-surfactant-for-silicone-emulsification-and-its-application-in-hair-care-products-a-promising-alternative-to-quaternary-ammonium-cationic-surfactants
#14
Mika Fujii, Motoki Inoue, Toshiro Fukami
OBJECTIVE: Quaternary ammonium cationic surfactants (ACSs) and N-[3-alkyl(12,14)oxy-2-hydroxypropyl]-L-arginine hydrochloride (N-AOHPA) were used to emulsify silicone. The potential of the resulting emulsions in hair conditioning products was investigated. METHODS: The emulsions were prepared using a homogenizer and/or high-pressure homogenizer. ACSs and N-AOHPA were used as silicone emulsifiers. The stability of the emulsions were evaluated by measuring particle sizes, creaming fractions, polydispersity indexes and zeta potentials...
July 12, 2017: International Journal of Cosmetic Science
https://www.readbyqxmd.com/read/28694432/seasonal-variation-modulates-coral-sensibility-to-heat-stress-and-explains-annual-changes-in-coral-productivity
#15
Tim Scheufen, Wiebke E Krämer, Roberto Iglesias-Prieto, Susana Enríquez
The potential effects of seasonal acclimatization on coral sensitivity to heat-stress, has received limited attention despite differing bleaching thresholds for summer and winter. In this study, we examined the response of two contrasting phenotypes, termed winter and summer, of four Caribbean reef corals to similar light and heat-stress levels. The four species investigated were categorized into two groups: species with the ability to harbour large number of symbionts, Orbicella annularis and O. faveolata, and species with reduced symbiont density (Montastraea cavernosa and Pseudodiploria strigosa)...
July 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28692376/multiplex-staining-by-sequential-immunostaining-and-antibody-removal-on-routine-tissue-sections
#16
Maddalena Maria Bolognesi, Marco Manzoni, Carla Rossana Scalia, Stefano Zannella, Francesca Maria Bosisio, Mario Faretta, Giorgio Cattoretti
Multiplexing, labeling for multiple immunostains in the very same cell or tissue section in situ, has raised considerable interest. The methods proposed include the use of labeled primary antibodies, spectral separation of fluorochromes, bleaching of the fluorophores or chromogens, blocking of previous antibody layers, all in various combinations. The major obstacles to the diffusion of this technique are high costs in custom antibodies and instruments, low throughput, and scarcity of specialized skills or facilities...
July 1, 2017: Journal of Histochemistry and Cytochemistry: Official Journal of the Histochemistry Society
https://www.readbyqxmd.com/read/28689366/micro-ct-and-fe-sem-enamel-analyses-of-calcium-based-agent-application-after-bleaching
#17
Mauricio Neves Gomes, Flávia Pires Rodrigues, Nick Silikas, Carlos Eduardo Francci
OBJECTIVES: The objective of the present study is to evaluate the effects of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) on bleached enamel. MATERIALS AND METHODS: A bleaching agent (35% hydrogen peroxide) was applied, 4 × 8 min on premolar teeth (n = 8). A CPP-ACP paste was applied for 7 days. Prior and post-treatment, microtomography images were obtained and 3D regions of interest (ROIs) were selected, from outer enamel, extending to 110...
July 8, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28685202/spectrophotometric-analysis-of-the-effectiveness-of-a-novel-in-office-laser-assisted-tooth-bleaching-method-using-er-cr-ysgg-laser
#18
Dimitrios Dionysopoulos, Dimitrios Strakas, Kosmas Tolidis, Effrosyni Tsitrou, Effimia Koumpia, Eugenia Koliniotou-Koumpia
The purpose of this in vitro study was to compare the effectiveness of a novel Er,Cr:YSGG laser-assisted in-office tooth bleaching method with a conventional method by spectrophotometric analysis of the tooth color change. Furthermore, the influence of the application time of the bleaching gel on the effectiveness of the methods and the maintenance of the results 7 days and 1 month after the treatments were also evaluated. Twenty-four bovine incisors were stained and randomly distributed into four groups...
July 7, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28683118/reef-calcifiers-are-adapted-to-episodic-heat-stress-but-vulnerable-to-sustained-warming
#19
Marleen Stuhr, Claire E Reymond, Vera Rieder, Pamela Hallock, Jörg Rahnenführer, Hildegard Westphal, Michal Kucera
Shallow marine ecosystems naturally experience fluctuating physicochemical conditions across spatial and temporal scales. Widespread coral-bleaching events, induced by prolonged heat stress, highlight the importance of how the duration and frequency of thermal stress influence the adaptive physiology of photosymbiotic calcifiers. Large benthic foraminifera harboring algal endosymbionts are major tropical carbonate producers and bioindicators of ecosystem health. Like corals, they are sensitive to thermal stress and bleach at temperatures temporarily occurring in their natural habitat and projected to happen more frequently...
2017: PloS One
https://www.readbyqxmd.com/read/28682856/squamous-cell-carcinoma-of-the-peristomal-skin-of-a-gastrostomy-case-study
#20
Carlos Cerdán Santacruz, Cristina Díaz Del Arco, Miguel Ángel Rubio Herrera, Andrés Sánchez-Pernaute, Antonio José Torres García
BACKGROUND: Primary skin tumors that develop at enteral feeding stomas are extremely rare. Ongoing surveillance of these stomas, including the peristomal skin, is essential to early diagnosis and treatment of these tumors. CASE: A 73-year-old man with an esophageal chemical burn caused by swallowing sodium hypochlorite (bleach) approximately 50 years earlier that was initially managed with esophageal exclusion and placement of a gastrostomy device for enteral feeding presented with an exophytic and painful mass of the skin adjacent to his gastrostomy site...
July 2017: Journal of Wound, Ostomy, and Continence Nursing
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