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crystal violet

Janelle Lee, Janice A Townsend, Tatyana Thompson, Thomas Garitty, Arpan De, Qingzhao Yu, Brian M Peters, Zezhang T Wen
To evaluate the cariogenic properties of almond milk beverages, 6 almond milks, along with soy and whole bovine milk, were analyzed for their abilities to support Streptococcus mutans biofilm formation and acid production, and their capacity to buffer changes in pH. Biofilm formation by S. mutans was analyzed using an in vitro 96-well plate model and measured by crystal violet staining. Acid production by S. mutans was evaluated by a colorimetric L-lactate assay and pH measurement of bacterial cultures. Buffering capacity was assessed by a pH titration assay...
December 15, 2017: Caries Research
Jinu Udayabhanu, Vaitheeswari Kannan, Manish Tiwari, Geetha Natesan, Benelli Giovanni, Venkatachalam Perumal
Textile industries release tonnes of harmful toxic dyes into the environment, causing severe effects on living organisms, including humans. Mosquitoes vectors spread important diseases which cause millions of human deaths worldwide. To control mosquitoes a number of synthetic mosquitocidal agents have been employed but all these pesticides pose harmful effects to human health and non-target species and also led to resistance development in treated vectors. Microbial strains are also developing resistance to the available antibiotics, this currently represents a major public health challenge...
December 6, 2017: Journal of Photochemistry and Photobiology. B, Biology
Hulya Nalcacioglu, Ozan Ozkaya, Gurkan Genc, Suat Ayyildiz, Mehmet Kefeli, Murat Elli, Oguz Aydin, Meltem Ceyhan Bilgici
Amyloidosis is a heterogeneous group of disorders characterized by extracellular deposition of unique protein fibrils. The least common presentation of an amyloid deposition is as a discrete mass called amyloidoma or amyloid tumor. We report a case of a soft tissue amyloidoma in the abdomen of a 16-year-old girl who was diagnosed as having systemic amyloidosis. A girl aged 16 years was referred to our hospital with a pre-diagnosis of a retroperitoneal mass documented with abdominal ultrasonography and tomography...
December 13, 2017: International Journal of Rheumatic Diseases
Leticia Belén Escudero, Patricia Nora Smichowski, Guilherme Luiz Dotto
In the present work, Iridaea cordata (IC), a red marine macroalgae, was used as an efficient biosorbent for the removal of crystal violet (CV) and methylene blue (MB) dyes from aqueous solutions. The effects of pH (5, 7, and 9) and IC concentration (1, 3, and 5 g L-1) on the biosorption were studied through a 32 full factorial design. Under the optimal conditions (pH: 7, biosorbent concentration: 1 g L-1), biosorption kinetic studies were developed and the obtained experimental data were evaluated by pseudo-first order and pseudo-second order models...
December 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Martina Oder, Mateja Arlič, Klemen Bohinc, Rok Fink
The aim of this study was to analyze the impact of hydrodynamic forces on the multiplication of E. coli, and biofilm formation and dispersion. The experiments were provided in a flow chamber simulating a cleaning-in-place system. Biofilm biomass was measured using a crystal violet dye method. The results show that hydrodynamic forces affect not only biofilm formation and dispersion but the multiplication of E. coli in the first place. We found more biofilm biomass on the rough surface than on the smooth one...
December 12, 2017: International Journal of Environmental Health Research
Priscilla Morais Monfredini, Ana Carolina Remondi Souza, Renan Pelluzzi Cavalheiro, Ricardo Andreotti Siqueira, Arnaldo Lopes Colombo
Persistent candidemia refers to the continued isolation of the same Candida species in the blood of a candidemic patient despite appropriate therapy. Despite the clinical importance of persistent candidemia, studies have superficially addressed the biological conditions behind this phenomenon. The aim of this study was to evaluate the correlation between the biofilm-forming ability by Candida bloodstream isolates and the persistence of infection. A total of 55 isolates of Candida were tested and characterized in two groups: (i) group I, which included seven patients with persistent candidemia, and (ii) group II, which included 18 patients with nonpersistent candidemia...
December 8, 2017: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
Volker Lorenz, Sophie Ehle, Phil Liebing, Felix Engelhardt, Haleh Hashemi-Haeri, Florian Oehler, Dariush Hinderberger, Sabine Busse, Jens Urbaschok, Frank T Edelmann
A unique trivalent manganese siloxide complex, blue-violet MnIIILi2Cl[(Ph2SiO)2O]2(THF)4·2THF (3) has been prepared by a straightforward two-step synthetic protocol. Lithiation of (Ph2SiOH)2O (1) followed by reaction with MnCl2(THF)2 gave the structurally remarkable Mn(ii) precursor MnIILi4Cl2[(Ph2SiO)2O]2(THF)5·2THF (2). Surprisingly, the final oxidation step could be achieved using KMnO4 in THF to provide the Mn(iii) species 3 in high yield (91%). Both title compounds were structurally characterized by single-crystal X-ray diffraction...
December 11, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Jin-Xin Zheng, Yang Wu, Zhi-Wei Lin, Zhang-Ya Pu, Wei-Ming Yao, Zhong Chen, Duo-Yun Li, Qi-Wen Deng, Di Qu, Zhi-Jian Yu
Enterococcus faecalis biofilm traits and distribution characteristics in China have not been clarified. This study aimed to determine the prevalence and characteristics of E. faecalis biofilm formation in a sample of clinical isolates and to explore the virulence factors associated with biofilm formation in those isolates. A total of 265 E. faecalis isolates were collected from patients in Shenzhen, China. Virulence genes were detected within the genomes of the microbes by polymerase chain reaction. The isolates were subjected to multilocus sequence typing (MLST) based on housekeeping genes...
2017: Frontiers in Microbiology
M I Garrudo-Guirado, A Blanco-Flores, H P Toledo-Jaldin, V Sánchez-Mendieta, A R Vilchis-Néstor
Water pollution caused by heavy metals and organic compounds is an environmental problem with negative impact, making the restoration of water quality a priority. In this paper, the adsorption of xylenol orange dye (XO) on vitreous tuff mineral (VT) was studied. It was established that the adsorption capacity of VT was 45.17 mg/g. The removal was carried out by interactions between active sites on the surface of the material and the functional groups of the dye. The solid waste obtained from this process (VTXO) was reused as adsorbent material for Cu removal in the form of the complex Cu-NH3 because this process was done in an ammoniacal medium...
December 5, 2017: Journal of Environmental Management
Didem Kart, Ayşe Semra Kustimur, Meral Sağıroğlu, Ayşe Kalkancı
BACKGROUND: Enterococcus faecalis, Escherichia coli, Staphylococcus epidermidis, Pseudomonas aeruginosa and Candida albicans biofilms are major causes of catheter-associated urinary tract infections. Antimicrobial-coated or impregnated urinary catheters are seen as a possible way to prevent these infections. AIMS: To determine the biofilm-forming ability of 89 E. faecalis isolates from urinary tract infections and to compare several urinary catheters for antimicrobial durability and the inhibitory effects on biofilm formation of different laboratory strains and clinical isolates of E...
December 1, 2017: Balkan Medical Journal
Austin Yoo, Giampiero Rossi-Fedele, Stephen P Kidd, Anthony H Rogers, Peter S Zilm
INTRODUCTION: Extracellular material (ECM) surrounding Enterococcus faecalis may play a role in increasing resistance to environmental stresses. Our aim was to determine ECM levels in response to subminimal inhibitory concentrations of sodium hypochlorite (sub-MIC/NaOCl) or anaerobic growth and determine the impact on biofilm development. METHODS: From 37 E. faecalis clinical strains, 19 were selected according to their biofilm-producing ability by using a crystal violet biofilm assay: 10 strong, 4 intermediate, and 5 non-biofilm producers...
December 2, 2017: Journal of Endodontics
Wenxian Wei, Qingli Huang
Cellophane was taken as platform to fabricate a new SERS substrate via silver mirror action. From Raman spectra, it can be found that the Raman signal of Ag-coated cellophane has little influence on the detection of analytes molecules. Raman mapping analysis showed that the cellophane-based SERS substrate has good uniformity. By using the Ag-coated cellophane, 10-6-10-9M crystal violet (CV) could be detected by this substrate and the reproducibility of the substrate was also involved. Acetamiprid was also detected via Ag-coated cellophane...
December 1, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Di Ming, Dacheng Wang, Fengjiao Cao, Hua Xiang, Dan Mu, Junjie Cao, Bangbang Li, Ling Zhong, Xiaoyun Dong, Xiaobo Zhong, Lin Wang, Tiedong Wang
The ability to form biofilms on surfaces makes Staphylococcus aureus the main pathogenic factor in implanted medical device infections. The aim of this study was to discover a biofilm inhibitor distinct from the antibiotics used to prevent infections resulting from S. aureus biofilms. Here, we describe kaempferol, a small molecule with anti-biofilm activity that specifically inhibited the formation of S. aureus biofilms. Crystal violet (CV) staining and fluorescence microscopy clearly showed that 64 μg/ml kaempferol inhibited biofilm formation by 80%...
2017: Frontiers in Microbiology
Bo-Hyung Lee, Michel Hébraud, Thierry Bernardi
Food contamination by Listeria monocytogenes remains a major concern for some food processing chains, particularly for ready-to-eat foods, including processed foods. Bacterial adhesion on both biotic and abiotic surfaces is a source of contamination by pathogens that have become more tolerant or even persistent in food processing environments, including in the presence of adverse conditions such as cold and dehydration. The most distinct challenge that bacteria confront upon entry into food processing environments is the sudden downshift in temperature, and the resulting phenotypic effects are of interest...
2017: Frontiers in Microbiology
Nadia Wajid, Muhammad Azam, Seemab Khalid, Fatima Ali, Aamer Qazi, M H Qazi
OBJECTIVE: To assess the role of Vitamin E to improve the survival of Wharton's jelly derived mesenchymal stem cells (WJMSCs) in breast cancer conditions. STUDY DESIGN: An experimental study. PLACE AND DURATION OF STUDY: Centre for Research in Molecular Medicine, University of Lahore, from November 2016 to March 2017. METHODOLOGY: WJMSCs were obtained from umbilical cord tissue with enzyme digestion method. Isolated cells were characterized for CD90 and CD45 by immunocytochemistry...
December 2017: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
Rene Christena Lowrence, Akshaya Ramakrishnan, Niranjana Sri Sundaramoorthy, Aswin Shyam, Vidhyalakshmi Mohan, Himesh M V Subbarao, Venkatasubramanian Ulaganathan, Thiagarajan Raman, Anand Solomon, Saisubramanian Nagarajan
AIMS: To enhance the antimicrobial and antibiofilm activity of norfloxacin against the planktonic and biofilm mode of growth in ESKAPE pathogens using chemically modified norfloxacin salts. METHODS AND RESULTS: Antimicrobial testing, synergy testing and time kill curve analysis, were performed to evaluate antibacterial effect of norfloxacin carboxylic acid salts against ESKAPE pathogens. In vivo efficacy to reduce bacterial bioburden was evaluated in zebrafish infection model...
November 27, 2017: Journal of Applied Microbiology
Xing-Ru Chen, Xiao-Ting Wang, Mei-Qi Hao, Yong-Hui Zhou, Wen-Qiang Cui, Xiao-Xu Xing, Chang-Geng Xu, Jing-Wen Bai, Yan-Hua Li
The imidazole glycerophosphate dehydratase (IGPD) protein is a therapeutic target for herbicide discovery. It is also regarded as a possible target in Staphylococcus xylosus (S. xylosus) for solving mastitis in the dairy cow. The 3D structure of IGPD protein is essential for discovering novel inhibitors during high-throughput virtual screening. However, to date, the 3D structure of IGPD protein of S. xylosus has not been solved. In this study, a series of computational techniques including homology modeling, Ramachandran Plots, and Verify 3D were performed in order to construct an appropriate 3D model of IGPD protein of S...
2017: Frontiers in Chemistry
Weslley F Oliveira, Priscila M S Silva, Rayane C S Silva, Germana M M Silva, Giovanna Machado, Luana C B B Coelho, Maria T S Correia
BACKGROUND: Infections are one of the main reasons for removal of implants from patients, and usually need difficult and expensive treatments. Staphylococcus aureus and Staphylococcus epidermidis are the most frequent pathogens. AIM: To review the epidemiology and pathogenesis of implant-related infections. METHODS: Relevant studies were identified by electronic searching of the following databases: PubMed, ScienceDirect, Academic Google and CAPES Journal Portal...
November 21, 2017: Journal of Hospital Infection
Xiuli Wang, Shan Zhang, Xiang Wang, Guocheng Liu, Hongyan Lin, Huixiu Zhang
By changing the pH values and solvents of reaction systems, four polyoxomolybdate-based compounds, [CoL(H2O)2][β-Mo8O26]0.5 (1), {[Co2L2(H2O)3][Mo7O23]}·3H2O (2), [Co2L3][δ-Mo8O26]0.5[β-Mo8O26]0.5·10H2O (3), [Co2L3][H4Mo8O28]·4DMA·2H2O (4), (L = 1,3-bis(1H-imidazole-4-carboxamido)metaphenylene, DMA = N,N'-dimethylacetamide), have been synthesized in the presence of the Co(2+) ion, L ligand and Mo7O24(6-). Compounds 1 and 2 were obtained under hydrothermal conditions; the different pH values result in two kinds of polyoxomolybdate anions, [β-Mo8O26](4-) in 1 and [Mo14O46](8-) in 2, and the similar [CoL(H2O)2](2+) or [Co2L2(H2O)3](4+) metal-organic chains...
November 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Bing Yang, Zhixin Lei, Yishuang Zhao, Saeed Ahmed, Chunqun Wang, Shishuo Zhang, Shulin Fu, Jiyue Cao, Yinsheng Qiu
The current study was conducted to evaluate the antibacterial combination efficacies, and whether the sub-inhibitory concentrations (sub-MIC) of antibiotics can influent on the biofilm formation of S. aureus. The minimum inhibitory concentration (MIC) of common antibacterial drugs was determined in vitro against clinical isolates of Staphylococcus aureus (S. aureus), Escherichia coli (E. coli), and Pasteurella multocida (P. multocida) alone and in combination with each other by using the broth microdilution method and the checkerboard micro-dilution method analyzed with the fractional inhibitory concentration index (FICI), respectively...
2017: Frontiers in Microbiology
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