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Krippner Johanna - - 2013
Maize is the most important grain crop grown for human nutrition, animal fodder and biogas production worldwide. Nonetheless, no systematic studies have been undertaken on these plants to examine the uptake mechanisms for perfluoroalkyl substances (PFASs) dependent upon chain length and pH value. The aim of the present study was ...
Ueda Tsuyoshi - - 2013
N-Formylsaccharin, an easily accessible crystalline compound, has been employed as an efficient CO source in Pd-catalyzed fluorocarbonylation of aryl halides to afford the corresponding acyl fluorides in high yields. The reactions use a near-stoichiometric amount of the CO source (1.2 equiv) and tolerate diverse functional groups. The acyl fluorides obtained ...
Agulló-Antón María-Ángeles - - 2013
The rooting of stem cuttings is a common vegetative propagation practice in many ornamental species. A detailed analysis of the morphological changes occurring in the basal region of cultivated carnation cuttings during the early stages of adventitious rooting was carried out and the physiological modifications induced by exogenous auxin application ...
Hendricks Julie L - - 2013
To measure the pH, titratable acidity, fluoride concentration and erosive potential of brewed teas. Bag teas were purchased to represent black, green, citrus, fruity, and floral tea flavors from Tulsi, Bigelow, HyVee, Tazo, and Yogi brands and brewed (1 bag/240 ml) in boiling water for 3 minutes. The pH, titratable ...
Tahmassebi J F - - 2013
This prospective, randomised in vitro study was to investigate the pH and titratable acidity of fruit smoothie drinks and to assess the effect of these drinks on enamel erosion. Fifty enamel slabs were divided into five groups which were allocated to the sample solutions groups: Innocent(®) smoothie strawberries and bananas ...
Danelon Marcelle - - 2013
The objective of this study was to evaluate the in vitro effect of low-fluoride (F) gels supplemented with sodium trimetaphosphate (TMP) on enamel demineralization. Bovine enamel blocks (n = 160) were selected based on surface hardness (SH) and divided into eight treatment groups (n = 20 per group): no F or TMP (placebo), 3 % ...
Shellis R P - - 2013
To quantify the relationships between buffering properties and acid erosion and hence improve models of erosive potential of acidic drinks, a pH-stat was used to measure the rate of enamel dissolution in solutions of citric, malic and lactic acids, with pH 2.4-3.6 and with acid concentrations adjusted to give buffer ...
Caboni Pierluigi - - 2013
The nematicidal activity along with the chemical characterisation of aqueous extracts and essential oils of three mint species, namely Mentha x piperita, Mentha spicata and Mentha pulegium were investigated. The phytochemical analysis of the essential oils was performed by means of GC/MS, while the aqueous extracts were analysed by LC/MS. ...
Nam Sung Min - - 2013
Valeriana officinalis is used in herbal medicine of many cultures as mild sedatives and tranquilizers. In this study, we investigated the effects of extract from valerian root extracts and its major component, valerenic acid on memory function, cell proliferation, neuroblast differentiation, serum corticosterone, and lipid peroxidation in adult and aged ...
Rasheed Dalia M - - 2013
Over 100 species of the genus Salsola are distributed in dry, arid parts of Asia, Europe and Africa, of which many species are recognised as antifungal, anticancer, antihypertensive and anthelmintic agents. Egyptian Salsola received scant characterisation of either its phytochemical composition or its biological effects. In this study, the metabolite ...
Joo Ji Bong - - 2013
Mesoporous hollow colloidal particles with well-defined characteristics have potential use in many applications. In liquid-phase catalysis, in particular, they can provide a large active surface area, reduced diffusion resistance, improved accessibility to reactants, and excellent dispersity in reaction media. Herein, we report the tailored synthesis of sulfated ZrO2 hollow nanostructures ...
Vishwanath Sollapura J - - 2013
Suberin is found in a variety of tissue such as root endoderms and periderms, storage tuber periderms, trees cork layer, and seed coats. It acts as a hydrophobic barrier to control the movement of water, gases and solutes as well as an anti-microbial barrier. Suberin consists of polymerized phenolics, glycerol, ...
Rigét Frank - - 2013
Time-series of perfluorinated alkylated substances (PFASs) in East Greenland polar bears and East and West Greenland ringed seals were updated in order to deduce whether a response to the major reduction in perfluoroalkyl production in the early 2000s had occurred. Previous studies had documented an exponential increase of perfluorooctane sulphonate ...
Nascimento Fernanda C - - 2013
The large enhancement of signal observed in surface enhanced Raman spectroscopy (SERS) could be helpful for identifying amino acids on the surface of other planets, in particular for Mars, as well as in prebiotic chemistry experiments of interaction minerals/amino acids. This paper reports the effect of several substances (NaCl, MgCl2, ...
Batalha-Silva Silvana - - 2013
This study sought to measure the microtensile bond strength of a nanofilled composite resin to human dentin after phosphoric acid etching followed by nonvital bleaching. Scanning electron microscopy was used to analyze fracture modes. Twenty extracted sound human maxillary premolars were prepared for Class I defects and assigned randomly to ...
Bagherian Ali A Department of Pediatric Dentistry, Dental School, Rafsanjan University of Medical Sciences, Rafsanjan, - - 2013
A prolonged life of fissure sealant has always been the target for preventing caries in vulnerable newly erupted teeth. The use of preparatory techniques including bur introduction to the fissures is considered among such improving steps. Ninety freshly extracted healthy maxillary premolar teeth were randomly selected for this investigation. Teeth ...
Eom Sora - - 2013
We developed a fast and simple method to functionalize a quartz crystal microbalance (QCM) with liposomes composed of phosphatidylcholine lipid and the N-hydroxysuccinimide (NHS) ester of palmitic acid. The liposome was applied directly to a bare gold surface of a QCM to prepare the lipid bilayer presenting NHS groups on ...
Do Dominic - - 2013
Composite restorations accumulate more biofilm than other dental materials. This increases the likelihood for the hard tissues supporting a restoration (i.e. dentin and enamel) to be exposed to acidic conditions beyond that resulting from dietary variations. In this investigation the fatigue strength and fatigue crack growth resistance of human coronal ...
Ali Hanein - - 2013
To measure, in vitro, the pH and titratable acidity (TA) of various soft drinks and to assess the erosive effect of smoothies using an in situ model. The in vitro phase of this study included measuring the inherent pH of six different commercially available smoothies, diet coke, and citric acid ...
Choi Eun-Kyoung EK Department of Environmental Education, Sunchon National University, #255 Jungang-ro, Sunchon, Jeonnam 540-742, - - 2013
Formic acid was used for the nitrate reduction as a reductant in the presence of Pd:Cu/gamma-alumina catalysts. The surface characteristics of the bimetallic catalyst synthesized by wet impregnation were investigated by SEM, TEM-EDS. The metals were not distributed homogeneously on the surface of catalyst, although the total contents of both ...
Aykut-Yetkiner Arzu - - 2013
The objective of this in vitro study was to investigate the effect of viscosity-modified soft acidic drinks on enamel erosion. A total of 108 bovine enamel samples (∅ = 3 mm) were embedded in acrylic resin and allocated into six groups (n = 18). Soft acidic drinks (orange juice, Coca-Cola, Sprite) were used both in ...
Turi Christina E - - 2013
Ligusticum canbyi (J.M. Coult & Rose) is a medicinal understory forest species used in traditional rituals and ceremonies for spiritual enlightenment and improved mental health. Very little is known about the phytochemical complexity or diversity of L. canbyi tissues or extracts. The current study was undertaken to determine whether Ligusticum tissues ...
Razvag Yair - - 2013
This paper describes single-molecule force spectroscopy measurements of the interaction between individual amino acid residues and inorganic surfaces in an aqueous solution. In each measurement there is an amino acid residue, lysine, glutamate, phenylalanine, leucine, or glutamine, each represents a class of amino acids (positively or negatively charged, aromatic, nonpolar ...
Rölla Gunnar - - 2013
Abstract Objective. To examine the erosion-inhibiting effect of different concentrations of hydrofluoric acid. Materials and methods. Thirty-six human molars were individually treated with 10 ml of 0.1 M citric acid for 30 min (Etch 1), acid was collected and stored until analysis. The teeth were randomly divided into six groups ...
Eliades George - - 2013
To evaluate the effect of desensitising agents on human dentine morphology and composition. Randomly assigned human coronal-dentine specimens were subjected to: (a) no treatment (smear-layer control, n=4); (b) acid etching with 6% citric acid (demineralised control, n=4); (c) treatment with desensitising agents (12 cycles of 60 s treatment with 60 ...
Gottumukkala Sruthima N V S - - 2013
Despite major advances in periodontal regeneration over the past three decades, complete regeneration of the lost periodontium on a regular and predictable basis in humans has still remained elusive. The identification of stem cells in the periodontal ligament together with the growing concept of tissue engineering has opened new vistas ...
Zhang Ru - - 2013
A lysine histidine transporter (LHT) cDNA was isolated and characterized from the roots of Panax ginseng, designated PgLHT. The cDNA is 1,865 bp with an open reading frame that codes for a protein with 449 amino acids and a calculated molecular mass of 50.6 kDa with a predicted isoelectric point ...
Li Xi - - 2013
In this paper, four organic acids constituents of Plateau alfalfa roots have been identified and detected by a novel capillary electrophoresis (CE) strategy which combined chitosan (CS) trapping and cetyltrimethyl ammonium bromide (CTAB) assisted sample stacking. Under the optimized condition, organic acids, i.e., aconitic acid, gallic acid, citric acid and ...
Schlicht Markus - - 2013
Controlled plant growth requires regulation through a variety of signaling molecules, including steroids, peptides, radicals of oxygen and nitrogen, as well as the 'classical' phytohormone groups. Auxin is critical for the control of plant growth and also orchestrates many developmental processes, such as the formation of new roots. It modulates ...
Norambuena Luis - - 2013
A simple and rapid method for the detection and extraction of oxolinic acid, flumequine, florfenicol and oxytetracycline from marine sediments was developed and validated. The analytes were extracted from the marine sediment using a solution of oxalic acid diluted in methanol with sonication before detection by HPLC using a diode-array ...
Ahkami Amir H - - 2013
To determine the contribution of polar auxin transport (PAT) to auxin accumulation and to adventitious root (AR) formation in the stem base of Petunia hybrida shoot tip cuttings, the level of indole-3-acetic acid (IAA) was monitored in non-treated cuttings and cuttings treated with the auxin transport blocker naphthylphthalamic acid (NPA) ...
Zhou Chenchen - - 2013
OBJECTIVES: Composites are the principal material for tooth cavity restorations due to their esthetics and direct-filling capabilities. However, composites accumulate biofilms in vivo, and secondary caries due to biofilm acids is the main cause of restoration failure. The objectives of this study were to: (1) synthesize new antibacterial monomers and ...
Xu Qinghua - - 2013
Nanocrystalline cellulose (NCC) isolated from bleached aspen kraft pulp was characterized, and its application as pulp strengthening additive and retention aid was investigated. Results showed that NCC with high crystallinity of more than 80% can be obtained using 64wt % sulfuric acid. The structure of nanocrystalline cellulose is parallelepiped rod-like, ...
Novac O - - 2013
N-(2-aminoethyl)-2-acetamidyl gellan gum (GCM-EDA) was prepared by carboxymethylation (via nucleophilic substitution of primary hydroxyl groups of the β-d-glucose unit of gellan gum, in the presence of alkali and chloroacetic acid) and reaction with tert-butyl N-(2-aminoethyl) carbamate (N-Boc-EDA) using 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDAC) as an activator, followed by deprotection with trifluoroacetic acid. ...
Martinez G L - - 2013
BACKGROUND AND OBJECTIVE: Our group recently found higher levels of serum long chain-polyunsaturated fatty acids (LC-PUFAs) in patients with chronic periodontitis compared to controls. However, the effect of periodontal treatment on LC-PUFA serum levels has not been investigated. The primary aim of the present study was to investigate the impact ...
Ugochukwu Uzochukwu C - - 2013
The role of clay minerals in crude oil saturated hydrocarbon removal during biodegradation was investigated in aqueous clay/saturated hydrocarbon microcosm experiments with a hydrocarbon degrading microorganism community. The clay minerals used for this study were montmorillonite, palygorskite, saponite and kaolinite. The clay mineral samples were treated with hydrochloric acid and ...
Yonemoto-Kobayashi Misato - - 2013
The facile syntheses of a variety functionalized propiolic acids were achieved by carboxylation of alkynylsilanes with carbon dioxide mediated by cesium fluoride under ambient conditions.
Butt Naziya - - 2013
Organic acids have the potential to decrease the strength of mineral trioxide aggregate (MTA) during retreatment. However, this might cause alterations in dentin composition and structure. The aim of this study was to assess the efficacy of chemicals on surface microhardness of white MTA (WMTA) and dentin. White MTA-Angelus(®) was ...
Yavari Hamid Reza - - 2013
The aim of the present study was to evaluate solubility of white mineral trioxide aggregate (WMTA) in an acidic environment. Twenty-four metal rings were prepared, filled with WMTA and randomly divided into two groups. The samples in groups 1 and 2 were set in synthetic tissue fluid with pH values ...
Dahiya Parveen - - 2013
Hyaluronic acid is a naturally occurring linear polysaccharide of the extracellular matrix of connective tissue, synovial fluid, and other tissues. Its use in the treatment of the inflammatory process is established in medical areas such as orthopedics, dermatology, and ophthalmology. The Pubmed/Medline database was searched for keywords "Hyaluronic acid and ...
Khoroushi Maryam - - 2013
Polymerization of resin-modified glass-ionomers (RMGIs) is mediated through two competing mechanisms: An acid-base reaction and a light-dependent resin polymerization. Furthermore, pre-conditioning with acid has resulted in an increase in enamel bond strength of some RMGIs. This in vitro study evaluated the effect of pre-conditioning and/or delayed irradiation on bond strength ...
Wang Zhiwei - - 2013
Reversible surface wetting behavior is a hot topic of research due to the potential engineering applications. In the present work, a hierarchical micro/nano-structure is fabricated on brass by alternate current (AC) etching. The superhydrophilic as-prepared etched brass (EB) turns into superhydrophobic after the modification of stearic acid for 1 min. ...
Wang Fang-Ping - - 2013
The adsorption behaviors of three carboxyl hydroxamic acids on diaspore (010) and kaolinite (001) have been studied by density functional theory (DFT) and molecular dynamics (MD) method. The results indicated that carboxyl hydroxamic acids could adsorb on diaspore surface by ionic bonds and hydrogen bonds, and adsorb on kaolinite surface ...
Zhang Zhen-Xia - - 2013
Three new sulfated triterpene glycosides, asprellanosides C-E (1-3), were isolated from the roots of Ilex asprella. Their structures were elucidated as 3β-[(2-O-sulfo-β-d-xylopyranosyl)oxy]urs-12,19(29)-diene-28-oic acid 28-β-d-glucopyranoside (1), 3β-[(2-O-sulfo-β-d-xylopyranosyl)oxy]urs-12,19-diene-28-oic acid 28-β-d-glucopyranoside (2), and 3β-[(2-O-sulfo-β-d-xylopyranosyl)oxy]urs-12,19-diene-28-oic acid (3) on the basis of the spectral and chemical methods.
Ling Zhenmin Z Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, - - 2013
Applying in silico simulations and in vitro experiments, the amino acid proline was proved to have a profound influence on Streptomyces griseus trypsinogen, and the hydrogen bond between H(57) and D(102) was found to be crucial for trypsin activity. By introducing an artificial propeptide, IVEF, the titer of trypsin was ...
Grippo John O - - 2013
Although there is a high prevalence of noncarious cervical lesions (NCCLs), the etiology of these lesions remains contentious. To evaluate the combined effects of cyclic fatigue stress and biocorrosion activity on NCCLs. Extracted premolar teeth were allocated into four groups (N = 10). Two groups were cyclically fatigue loaded (100 N; 72 cycles ...
Jeevitha M - - 2013
The amount of dietary fibre, mineral and vitamin were determined in root, rhizome and leaf of four commonly-available seagrasses, Cymodocea serrulata, Syringodium isoetifolium, Halophila ovalis and Halodule pinifolia at a station off Hare Island, Tuticorin (8°45' N, 78°12' E) in the Gulf of Mannar Biosphere region during premonsoon (July-September), monsoon ...
Miller Ruben J - - 2013
Very little research has been carried out investigating techniques for the restoration of obliterated serial numbers on vehicle glass. A study into the effectiveness of hydrofluoric (HF) acid, a known etchant for glass, has been performed. Character sequences previously etched into panes of vehicle glass were sanded to varying depths ...
Zhou Juan - - 2013
We investigated and compared the physicochemical properties (moisture, color, ash, pH, electrical conductivity, free acidity, lactonic acidity, total acidity, fructose, glucose, sucrose, diastase activity, and HMF) and mineral contents (Al, Ca, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Na, Ni, As, Cd, Pb, and Zn), as well as total ...
Albayrak Sevil - - 2013
To evaluate total phenolic, antioxidant and antimicrobial activities of methanolic extracts of the Wiedemannia multifida (W. multifida) and Wiedemannnia orientalis (W. orientalis). Phosmomolybdenum assay, DPPH radical scavenging activity and β-carotene-linoleate bleaching were used to evaluate the antioxidant capacity. The total phenolics were found to be (22.45±0.60) and (9.53±0.00) mg gallic ...
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