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https://www.readbyqxmd.com/read/28821127/a-comparative-study-on-cellulose-nanocrystals-extracted-from-bleached-cotton-and-flax-and-used-for-casting-films-with-glycerol-and-sorbitol-plasticisers
#1
Emilia Csiszár, Sebestyén Nagy
Cellulose nanocrystals (CNCs) were released from bleached cotton and flax by a sulphuric acid hydrolysis with about 40 and 34% yield, respectively. The rod-like cotton-CNC particles were slightly longer and wider and had a less pronounced aggregation ability in aqueous suspension than the flax-CNC ones. Films were cast from the CNC suspensions with sorbitol and glycerol plasticisers. The concept behind this research was to explore how the plasticisers - with similar structure but different molecular weight - and their concentrations affect the perceptible and measured properties of CNC films...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821100/activation-of-tempo-by-clo2-for-oxidation-of-cellulose-by-hypochlorite-fundamental-and-practical-aspects-of-the-catalytic-system
#2
Timo Pääkkönen, Raili Pönni, Jinze Dou, Markus Nuopponen, Tapani Vuorinen
Bromide-free TEMPO-catalyzed oxidation of the primary alcohols by sodium hypochlorite (NaOCl) does not proceed without a prior activation of the catalyst. Here were demonstrate an immediate in situ activation of the catalyst with an equimolar addition of chlorine dioxide (ClO2) relative to TEMPO. Sodium bromide (NaBr) had a similar role in activating the catalyst although NaBr was needed in excess and the activation took several minutes depending on the dosage of NaBr. The activation method, or the concentration of NaBr, did not affect the bulk oxidation rate...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28814729/thermally-induced-crystallization-hole-transport-nlo-and-photovoltaic-activity-of-a-bis-diarylamine-based-push-pull-molecule
#3
Yue Jiang, Magali Allain, Denis Gindre, Sylvie Dabos-Seignon, Philippe Blanchard, Clément Cabanetos, Jean Roncali
The synthesis of a molecule constituted of two diarylamine-based push-pull chromophores covalently linked via their nitrogen atom is described. Comparison of the electronic properties with the parent monomer shows that dimerization has negligible influence on the electronic properties of the molecule but exerts a dramatic impact on the capacity of the material to self-reorganize. Application of thermal annealing to thin films induces the crystallization under original morphologies, a process accompanied by a partial bleaching of the absorption in the visible range and by a huge increase of hole-mobility...
August 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28812568/gene-expression-plasticity-as-a-mechanism-of-coral-adaptation-to-a-variable-environment
#4
Carly D Kenkel, Mikhail V Matz
Local adaptation is ubiquitous, but the molecular mechanisms that give rise to this ecological phenomenon remain largely unknown. A year-long reciprocal transplant of mustard hill coral (Porites astreoides) between a highly environmentally variable inshore habitat and a more stable offshore habitat demonstrated that populations exhibit phenotypic signatures that are consistent with local adaptation. We characterized the genomic basis of this adaptation in both coral hosts and their intracellular symbionts (Symbiodinium sp...
November 7, 2016: Nature ecology & evolution
https://www.readbyqxmd.com/read/28811517/heritability-of-the-symbiodinium-community-in-vertically-and-horizontally-transmitting-broadcast-spawning-corals
#5
Kate M Quigley, Bette L Willis, Line K Bay
The dinoflagellate-coral partnership influences the coral holobiont's tolerance to thermal stress and bleaching. However, the comparative roles of host genetic versus environmental factors in determining the composition of this symbiosis are largely unknown. Here we quantify the heritability of the initial Symbiodinium communities for two broadcast-spawning corals with different symbiont transmission modes: Acropora tenuis has environmental acquisition, whereas Montipora digitata has maternal transmission. Using high throughput sequencing of the ITS-2 region to characterize communities in parents, juveniles and eggs, we describe previously undocumented Symbiodinium diversity and dynamics in both corals...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811302/effects-of-temperature-and-uvr-on-organic-matter-fluxes-and-the-metabolic-activity-of-acropora-muricata
#6
Lucile Courtial, Christine Ferrier-Pagès, Stéphan Jacquet, Riccardo Rodolfo-Metalpa, Stéphanie Reynaud, Cécile Rottier, Fanny Houlbrèque
Coral bleaching events are predicted to occur more frequently in the coming decades with global warming. The susceptibility of corals to bleaching during thermal stress episodes depends on many factors, including the magnitude of thermal stress and irradiance. The interactions among these two factors, and in particular with ultra-violet radiation (UVR), the most harmful component of light, are more complex than assumed, and are not yet well understood. This paper explores the individual and combined effects of temperature and UVR on the metabolism of Acropora muricata, one of the most abundant coral species worldwide...
August 15, 2017: Biology Open
https://www.readbyqxmd.com/read/28808454/concurrent-effects-of-bleaching-materials-and-the-size-of-root-canal-preparation-on-cervical-dentin-microhardness
#7
Maryam Kazemipoor, Shaghayegh Azad, Farnaz Farahat
INTRODUCTION: The aim of the present study was to evaluate the concurrent effect of root canal preparation size and intra coronal bleaching on dentin microhardness. METHODS AND MATERIALS: Seventy-two intact anterior teeth were root canal treated and randomly divided into two groups (n=36) according to the size of coronal root canal preparation. The coronal portions of the canals were then enlarged with #2 and 4 Peeso reamers, respectively. Following root canal obturation, teeth were assigned into three groups (n=12) to be treated with bleaching agents containing 35% hydrogen peroxide (HP), sodium perborate (SP) and distilled water as control group...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28807472/a-survey-of-domestic-wells-and-pit-latrines-in-rural-settlements-of-mali-implications-of-on-site-sanitation-on-the-quality-of-water-supplies
#8
P Martínez-Santos, M Martín-Loeches, N García-Castro, D Solera, S Díaz-Alcaide, E Montero, J García-Rincón
On-site sanitation is generally advocated as a means to eradicate the health hazards associated with open defecation. While this has provided a welcome upgrade to the livelihoods of millions of people in low-income countries, improved sanitation facilities are increasingly becoming a threat to domestic groundwater-based supplies. Within this context, a survey of pit latrines, domestic wells and improved water sources was carried out in a large rural village of southern Mali. All households were surveyed for water, sanitation and hygiene habits...
August 4, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28806510/reaction-between-pyridine-and-ch3nh3pbi3-_-surface-confined-reaction-or-bulk-transformation
#9
Xiaozhou Yu, Haoming Yan, Qing Peng
Pyridine molecules have been used to passivate the surface Pb2+ sites of CH3NH3PbI3, to recrystallize CH3NH3PbI3, and to bleach CH3NH3PbI3. These results contradict each other as recrystallization and optical-bleach require transformation of bulk CH3NH3PbI3, but surface passivation demands the confinement of the reaction at the surface region. The underlying mechanism for these seemly contradicting results are not yet understood. In this paper, we show, at 25 ºC, partial pressure of pyridine vapor is a determining factor for its reaction behaviors with CH3NH3PbI3: one can modify the surface region of CH3NH3PbI3 by using pyridine vapor of pressure 1...
August 14, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28804719/effect-of-2-bleaching-agents-with-a-content-of-high-concentrated-hydrogen-peroxide-on-stained-2-cad-cam-blocks-and-a-nanohybrid-composite-resin-an-afm-evaluation
#10
İzgen Karakaya, Esra Cengiz
The aim of this study was to evaluate color stability of 3 restorative materials, discoloration ability of different solutions, efficacy of 2 office bleaching agents, and surface roughness and topography. Sixty specimens for Clearfil Majesty Esthetic (CME), Lava Ultimate (LU), and Vita Enamic (VE) were prepared. They were immersed into 3 staining solutions for 2 weeks and then they were bleached. According to the measured L(⁎), a(⁎), and b(⁎) parameters described by CIELAB system, color changes (ΔE00), translucency parameters (TP), whiteness index values (W(⁎)), and changes in closeness to pure white (ΔW(⁎)) were calculated...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28803022/short-communication-antioxidative-and-antibacterial-activities-on-staphylococcus-aureus-and-escherichia-coli-o157-h4-in-milk-with-added-ginseng-marc-extract-fermented-by-lactobacillus-plantarum-kccm-11613p
#11
S J Eom, J E Hwang, J Jung, H-S Jee, K-T Kim, H-D Paik
Ginseng marc, a by-product of the extraction of fresh ginseng, is known to have bioactive compounds, but is frequently discarded as agriculture waste. The objectives of our study were to assess the antioxidative activity of fermented ginseng marc extract using Lactobacillus plantarum KCCM 11613P and to evaluate antibacterial activity of fermented milk with added ginseng marc extract during fermentation. After 24 h of fermentation of ginseng marc extract, the viable cell number was increased to 7.7 ± 0.1 log cfu/mL, and the pH and total titratable acidity were 4...
August 9, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28802847/structural-antioxidant-and-antimicrobial-activities-of-polysaccharides-extracted-from-olive-leaves
#12
Ibtihel Khemakhem, Ola Abdelhedi, Ines Trigui, Mohamed Ali Ayadi, Mohamed Bouaziz
In the present study, hot-water extraction procedure was used to recover polysaccharides from olive leaves. Primary structural characteristics were determined by nuclear magnetic resonance spectroscopy ((1)H NMR and (13)C NMR), Fourier Transform-Infrared spectroscopy (FT-IR) and X-ray diffractometry analysis. Emulsifying capacity, Zeta (ζ) potential and differential scanning calorimetric (DSC) of olive leaf polysaccharides (OLP) were investigated. Antioxidant and antimicrobial activities were then examined...
August 9, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28802271/antibiofilm-effect-of-poly-vinyl-alcohol-co-ethylene-pva-co-pe-halamine-film-against-listeria-innocua-and-escherichia-coli-o157-h7
#13
Andrea Cossu, Yang Si, Gang Sun, Nitin Nitin
Bacterial biofilm formation is linked to several infections and foodborne disease outbreaks. To address this challenge, there is an unmet need to develop rechargeable antimicrobial materials that can provide continuous sanitation of contact surfaces especially in the food industry. This study was aimed at evaluating a novel rechargeable antimicrobial polymer formed using PVA-co-PE with halamine functionality to prevent biofilm formation with repeated exposure to high loads of bacteria and organic content and also aid in inactivation of pre-formed biofilms upon contact with this novel material...
August 11, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28800923/-squamous-cell-carcinoma-associated-with-use-of-skin-lightening-cream
#14
O Faye, A-A Dicko, S Berthé, L Cissé, B Traoré, A Keita, Y Fofana, K Coulibaly, B Keita
BACKGROUND: Women widely use skin-lightening products for cosmetic purposes in sub-Saharan Africa despite numerous reported cutaneous and systemic complications. The occurrence of epidermoid carcinoma has long been reported, but only three cases have been published so far. We report the first case in Mali. PATIENTS AND METHODS: A 30-year old woman with no noteworthy medical history was seen at our outpatient center for cervical ulceration that had been present for the last 5 years...
August 8, 2017: Annales de Dermatologie et de Vénéréologie
https://www.readbyqxmd.com/read/28800540/rapid-extraction-of-amomum-tsao-ko-essential-oil-and-determination-of-its-chemical-composition-antioxidant-and-antimicrobial-activities
#15
Qi Cui, Li-Tao Wang, Ju-Zhao Liu, Hui-Mei Wang, Na Guo, Cheng-Bo Gu, Yu-Jie Fu
A simple, green and efficient extraction method named modified-solvent free microwave extraction (M-SFME) was employed for the extraction of essential oils (EOs) from Amomun tsao-ko. The process of M-SFME was optimized with the prominent preponderance of such higher extraction yield (1.13%) than those of solvent free microwave extraction (SFME, 0.91%) and hydrodistillation (HD, 0.84%) under the optimal parameters. Thirty-four volatile substances representing 95.4% were identified. The IC50 values of EOs determined by DPPH radical scavenging activity and β-carotene/linoleic acid bleaching assay were 5...
August 3, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28795699/photoexcitation-dynamics-of-p-nitroaniline-and-n-n-dimethyl-p-nitroaniline-in-1-alkyl-3-methylimidazolium-cation-based-ionic-liquids-with-different-alkyl-chain-lengths
#16
Y Kimura, S Ibaraki, R Hirano, Y Sugita, Y Yasaka, M Ueno
Photoexcitation dynamics of p-nitroaniline (pNA) and N,N-dimethyl-p-nitroaniline (DMpNA) in 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([Cnmim][NTf2]) with different alkyl chain lengths (from C2 to C12) was investigated using transient absorption spectroscopy. The internal conversion rate from the excited state to the ground state was estimated from bleach recovery around the ground state absorption centre, and the successive vibrational cooling rate in the ground state was estimated from the decay of the hot band observed at the red-edge of ground state absorption...
August 10, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28783465/photobiomodulation-in-the-prevention-of-tooth-sensitivity-caused-by-in-office-dental-bleaching-a-randomized-placebo-preliminary-study
#17
Andrea Paiva Corsetti Calheiros, Maria Stella Moreira, Flávia Gonçalves, Ana Cecília Correa Aranha, Sandra Ribeiro Cunha, Carolina Steiner-Oliveira, Carlos de Paula Eduardo, Karen Müller Ramalho
OBJECTIVE: Analyze the effect of photobiomodulation in the prevention of tooth sensitivity after in-office dental bleaching. BACKGROUND DATA: Tooth sensitivity is a common clinical consequence of dental bleaching. Therapies for prevention of sensitivity have been investigated in literature. MATERIALS AND METHODS: This study was developed as a randomized, placebo blind clinical trial. Fifty patients were selected (n = 10) and randomly divided into five groups: (1) control, (2) placebo, (3) laser before bleaching, (4) laser after bleaching, and (5) laser before and after bleaching...
August 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28782552/a-dynamic-bioenergetic-model-for-coral-symbiodinium-symbioses-and-coral-bleaching-as-an-alternate-stable-state
#18
Ross Cunning, Erik B Muller, Ruth D Gates, Roger M Nisbet
Coral reef ecosystems owe their ecological success - and vulnerability to climate change - to the symbiotic metabolism of corals and Symbiodinium spp. The urgency to understand and predict the stability and breakdown of these symbioses (i.e., coral 'bleaching') demands the development and application of theoretical tools. Here, we develop a dynamic bioenergetic model of coral-Symbiodinium symbioses that demonstrates realistic steady-state patterns in coral growth and symbiont abundance across gradients of light, nutrients, and feeding...
August 3, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28780417/purification-characterization-and-antioxidant-properties-of-a-novel-polysaccharide-extracted-from-sorghum-bicolor-l-seeds-in-sausage
#19
Sirine Ben Slima, Naourez Ktari, Imen Trabelsi, Hafedh Moussa, Iskandar Makni, Riadh Ben Salah
A novel polysaccharide named Sorghum Water-Soluble Polysaccharide (SWSP) was purified from Sorghum bicolor (L.) seeds. It was structurally characterized by high performance liquid chromatography (HPLC), thin layer chromatography (TLC), Fourier transform-infrared spectroscopy analysis (FT-IR), X-ray diffraction (XRD) and mass spectroscopy (MS). HPLC and TLC showed that SWSP is a glucose polymer. The FT-IR spectrum proved the polysaccharide characteristic band of SWSP. XRD and microscopy analyses revealed that SWSP is a semi-crystalline polymer...
August 3, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28780108/the-effect-of-bleaching-agents-on-the-degradation-of-vitamins-and-carotenoids-in-spray-dried-whey-protein-concentrate
#20
M A Stout, C W Park, M A Drake
Previous research has shown that bleaching affects flavor and functionality of whey proteins. The role of different bleaching agents on vitamin and carotenoid degradation is unknown. The objective of this study was to determine the effects of bleaching whey with traditional annatto (norbixin) by hydrogen peroxide (HP), benzoyl peroxide (BP), or native lactoperoxidase (LP) on vitamin and carotenoid degradation in spray-dried whey protein concentrate 80% protein (WPC80). An alternative colorant was also evaluated...
August 2, 2017: Journal of Dairy Science
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