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crystal violet

Bret M Boyle, Tracy A French, Ryan Michael Pearson, Blaine G McCarthy, Garret M Miyake
The incorporation of structural color into 3D printed parts is reported, presenting an alternative to the need for pigments or dyes for colored parts produced through additive manufacturing. Thermoplastic build materials composed of dendritic block copolymers were designed, synthesized, and used to additively manufacture plastic parts exhibiting structural color. The reflection properties of the photonic crystals arise from the periodic nanostructure formed through block copolymer self-assembly during polymer processing...
February 22, 2017: ACS Nano
Jinhui Wang, Wei Wang, Jichen Li, Liji Wu, Mei Song, Qinggang Meng
PURPOSE: The constitutive activation of the Ras-MEK-ERK signaling pathway in oral cavity squamous cell carcinoma (OSCC) has been found to be tightly controlled at multiple levels under physiological conditions. RASA1 and SPRED1 are two important negative regulators of this pathway, but the exact regulating mechanism remains unclear. In this study, we aimed to explore the potential regulating mechanisms involved in the Ras-MEK-ERK signaling pathway in OSCC. MATERIALS AND METHODS: MicroRNA (miRNA) expression was detected by quantitative reverse-transcription polymerase chain reaction...
2017: OncoTargets and Therapy
Simona Paulone, Giulia Malavasi, Andrea Ardizzoni, Carlotta Francesca Orsi, Samuele Peppoloni, Rachele Giovanna Neglia, Elisabetta Blasi
Candida albicans is the most common cause of oral mycoses. The aim of the present study was to investigate in vitro the susceptibility of C. albicans to mouthwashes, in terms of growth, survival and biofilm formation. Candida albicans, laboratory strain SC5314, and 7 commercial mouthwashes were employed: 3 with 0.2% chlorhexidine digluconate; 1 with 0.06% chlorhexidine digluconate and 250 ppm F- sodium fluoride; 3 with fluorine-containing molecules. None of the mouthwashes contained ethanol in their formulations...
January 2017: New Microbiologica
Emrah Torlak, Emre Korkut, Ali T Uncu, Yağmur Şener
The ability of Staphylococcus aureus to form biofilm is considered to be a major virulence factor influencing its survival and persistence in both the environment and the host. Biofilm formation in S. aureus is most frequently associated with production of polysaccharide intercellular adhesion by ica operon-encoded enzymes. The present work aimed at evaluating the in vitro biofilm production and presence of the icaA and icaD genes in S. aureus isolates from a dental clinic in Konya, Turkey. The surfaces of inanimate objects were sampled over a period of six months...
February 14, 2017: Journal of Infection and Public Health
Lisa Kirchhoff, Maike Olsowski, Katrin Zilmans, Silke Dittmer, Gerhard Haase, Ludwig Sedlacek, Eike Steinmann, Jan Buer, Peter-Michael Rath, Joerg Steinmann
Various fungi have the ability to colonize surfaces and to form biofilms. Fungal biofilm-associated infections are frequently refractory to targeted treatment because of resistance to antifungal drugs. One fungus that frequently colonises the respiratory tract of cystic fibrosis (CF) patients is the opportunistic black yeast-like fungus Exophiala dermatitidis. We investigated the biofilm-forming ability of E. dermatitidis and its susceptibility to various antiinfective agents and natural compounds. We tested 58 E...
February 17, 2017: Scientific Reports
Leila Taheran, Gholamreza Zarrini, Sirous Khorram, Mohammad Sadegh Zakerhamidi
BACKGROUND AND OBJECTIVES: Biomaterials are widely used in medical devices such as urinary catheters. One of the main problems associated with long term using of the urinary catheters is biofilm formation on their surfaces. Many techniques have been presented to reduce the biofilm formation. One of the most revolutionary techniques allowing such surface fictionalization is plasma surface modification. MATERIALS AND METHODS: In this study, a glow discharge plasma (GDP) effect on Escherichia coli biofilm formation on the surface of urinary catheter in the pressure of 1...
August 2016: Iranian Journal of Microbiology
Shih-Hung Hsieh, Sascha Brunke, Matthias Brock
Candida albicans is a dimorphic fungus that colonizes human mucosal surfaces with the potential to cause life-threatening invasive candidiasis. Studies on systemic candidiasis in a murine infection model using in vivo real-time bioluminescence imaging revealed persistence of C. albicans in the gall bladder under antifungal therapy. Preliminary analyses showed that bile conferred resistance against a wide variety of antifungals enabling survival in this cryptic host niche. Here, bile and its components were studied for their ability to reduce antifungal efficacy in order to elucidate the underlying mechanism of protection...
2017: Frontiers in Microbiology
Qiaofeng Han, Jiawei Pang, Xin Wang, Xiaodong Wu, Junwu Zhu
Unique flowerlike Bi2O2(OH)(NO3) (denoted as BION) hierarchitectures assembled by ultrathin nanosheets were hydrothermally synthesized from incomplete hydrolysis of anhydrous bismuth nitrate (Bi(NO3)3) after adsorption of glacial acetic acid (HAc). The structure, composition and optical property of the products were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis spectra, etc. The as-prepared flowerlike BION possessed ultrahigh surface area and thus exhibited exceptional photocatalytic activity for rhodamine B (RhB) degradation under UV light irradiation with efficiency about 17, 6 and 2...
February 6, 2017: Chemistry: a European Journal
Luide Rodrigo Martins, Josilene Aparecida Vieira Rodrigues, Oscar Fernando Herrera Adarme, Tânia Márcia Sacramento Melo, Leandro Vinícius Alves Gurgel, Laurent Frédéric Gil
Cellulose (Cel) and sugarcane bagasse (SB) were oxidized with an H3PO4-NaNO2 mixture to obtain adsorbent materials with high contents of carboxylic groups. The oxidation reactions of Cel and SB were optimized using design of experiments (DOE) and response surface methodology (RSM). The optimized synthesis conditions yielded Cox and SBox with 4.8mmol/g and 4.5mmol/g of carboxylic acid groups, respectively. Cox and SBox were characterized by FTIR, TGA, PZC and solid-state (13)C NMR. The adsorption of the model cationic dyes crystal violet (CV) and auramine-O (AO) on Cox and SBox in aqueous solution was investigated as a function of the solution pH, the contact time and the initial dye concentration...
May 15, 2017: Journal of Colloid and Interface Science
Jing Chen, Juan Leng, Xiai Yang, Liping Liao, Liangliang Liu, Aiping Xiao
In this study, magnetic graphene oxide (MGO) nanomaterials were synthesized based on covalent binding of amino Fe3O4 nanoparticles onto the graphene oxide (GO), and the prepared MGO was successfully applied as support for the immobilization of laccase. The MGO-laccase was characterized by transmission electron microscopy (TEM) and a vibrating sample magnetometer (VSM). Compared with free laccase, the MGO-laccase exhibited better pH and thermal stabilities. The optimum pH and temperature were confirmed as pH 3...
February 1, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Arash Asfaram, Mehrorang Ghaedi, Gholam Reza Ghezelbash, Francesco Pepe
Simultaneous biosorption of malachite green (MG) and crystal violet (CV) on biosorbent Yarrowia lipolytica ISF7 was studied. An appropriate derivative spectrophotometry technique was used to evaluate the concentration of each dye in binary solutions, despite significant interferences in visible light absorbances. The effects of pH, temperature, growth time, initial MG and CV concentration in batch experiments were assessed using Design of Experiment (DOE) according to central composite second order response surface methodology (RSM)...
January 30, 2017: Ecotoxicology and Environmental Safety
Sarra Sebaa, Nicolas Hizette, Zahia Boucherit-Otmani, Philippe Courtois
The present study investigated the in vitro effect of lysozyme (0-1,000 µg/ml) on Candida albicans (C. albicans) biofilm development. Investigations were conducted on C. albicans ATCC 10231 and on 10 clinical isolates from dentures. Strains were cultured aerobically at 37˚C in Sabouraud broth. Yeast growth was evaluated by turbidimetry. Biofilm biomass was quantified on a polystyrene support by crystal violet staining and on acrylic surfaces by counts of colony forming units. Lysozyme affected biofilm formation to a greater extent than it affected growth...
January 25, 2017: Molecular Medicine Reports
Ebrahim Alipanahpour Dil, Mehrorang Ghaedi, Gholam Reza Ghezelbash, Arash Asfaram
Present study is based on application of live yeast Yarrowia lipolytica 70562 as new biosorbent was investigated for the simultaneous biosorption of Crystal Violet (CV) and Brilliant Green (BG) from wastewater. The effect of operating parameters such as initial dye concentrations (6-14mgL(-1)), solution pH (4.0-8.0) and contact time (4-20h) was investigated by response surface methodology (RSM) for modeling and optimization of biosorption process and accordingly the best operational conditions was set as: initial CV and BG concentration of 8...
January 25, 2017: Ecotoxicology and Environmental Safety
Yunfeng Xu, Chao Shi, Qian Wu, Zhiwei Zheng, Peifeng Liu, Guanghui Li, Xiaoli Peng, Xiaodong Xia
Punicalagin, one of the main active compounds in pomegranate peel, has been reported to possess many properties, including antioxidant, antimicrobial, antiviral, and immunosuppressive activities. The aim of this study was to investigate the antibacterial effect of punicalagin against Staphylococcus aureus and possible mode of action. Growth inhibition activity was examined by the agar diffusion method. Then agar dilution method was adopted to determine the minimum inhibitory concentration (MIC). The effects of punicalagin on cell membrane were assessed by measuring potassium efflux...
January 27, 2017: Foodborne Pathogens and Disease
Lama Misba, Sahar Zaidi, Asad U Khan
BACKGROUND: Antimicrobial photodynamic therapy (APDT) is a process that generates reactive oxygen species (ROS) in presence of photosensitizer, visible light and oxygen which destroys the bacterial cells. We investigated the photoinactivation efficiency of phenothiazinium dyes and the effect of ROS generation on Gram positive and Gram negative bacterial cell as well as on biofilm. MATERIAL AND METHODS: Enterococcus faecalis and Klebsiella pneumonia were incubated with all the three phenothiazinium dyes and exposed to 630nm of light...
January 21, 2017: Photodiagnosis and Photodynamic Therapy
Sivaprasad Chinnakkannu Vijayakumar, Krishnan Venkatakrishnan, Bo Tan
We introduce a "non-noble metal" based SERS active nanobiosensor using a self-assembled 3D hybrid nickel nanonetwork. A tunable biomolecule detector fabricated by a bottom-up approach was functionalized using a multiphoton ionization energy mechanism to create a self-assembled 3D hybrid nickel nanonetwork. The nanonetwork was tested for SERS detection of crystal violet (CV) and glutathione (GSH) at two excitation wavelengths, 532 and 785 nm. The results reveal indiscernible peaks with a limit of detection (LOD) of 1 picomolar (pM) concentration...
February 3, 2017: ACS Applied Materials & Interfaces
Sara E Wirbisky, Jennifer L Freeman
Atrazine is an agricultural herbicide used throughout the Midwestern United States that frequently contaminates potable water supplies resulting in human exposure. Using the zebrafish model system, an embryonic atrazine exposure was previously reported to decrease spawning rates with an increase in progesterone and ovarian follicular atresia in adult females. In addition, alterations in genes associated with distinct molecular pathways of the endocrine system were observed in brain and gonad tissue of the adult females and males...
January 19, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
Imen Touihri-Barakati, Olfa Kallech-Ziri, Wiem Ayadi, Hervé Kovacic, Belgacem Hanchi, Karim Hosni, José Luis
Integrins are essential protagonists in the complex multistep process of cancer progression and are thus attractive targets for the development of anticancer agents. Cucurbitacin B, a triterpenoid purified from the leaves of Tunisian Ecballium elaterium exhibited an anticancer effect and displayed anti-integrin activity on human glioblastoma U87 cells, without being cytotoxic at concentrations up to 500nM. Here we show that cucurbitacin B affected the adhesion and migration of U87 cells to fibronectin in a dose-dependent manner with IC50 values of 86...
January 17, 2017: European Journal of Pharmacology
Jian Wang, Yuanyuan Mi, Fenglai Yuan, Sheng Wu, Xiaoming You, Feng Dai, Yi Huang, Jia Cao, Jin Zhu, Boxin Xue, Lijie Zhu
This study was aimed to analyze the potential role of Corin in the procession of diabetic ED and to explore the underlying mechanism. Diabetic ED rat model was constructed and the characteristics of diabetic ED and control rats were recorded at 4, 8, 12 and 16 weeks. qRT-PCR and Western bloting were used to detected the mRNA and protein levels. Intracellular cGMP detection was accomplished using a commercial radioimmunoassay method. Vascular endothelial cell from rat corpus cavernosum spiral artery was isolated and transfected with si- Corin to analyzed the potential role of Corin...
January 20, 2017: Journal of Cellular Biochemistry
Heung-Shick Lee, Younhee Kim
The fungal cell wall and cell membrane are main targets of antifungals. In this study, we report that antifungal activity of the ethanol extract from Paeonia lactiflora against Candida albicans is associated with synergistic action of preventing cell wall synthesis and changing membrane depolarization and permeability in C. albicans. First, the ethanol extract from P. lactiflora was involved in damaging the integrity of cell wall in C. albicans: In isotonic media, cell burst of C. albicans by the P. lactiflora ethanol extract could be restored, and minimum inhibitory concentration (MIC) of the P...
January 18, 2017: Journal of Microbiology and Biotechnology
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