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https://www.readbyqxmd.com/read/28819664/antimicrobial-carbon-nanospheres
#1
Yao-Wen Jiang, Ge Gao, Xiaodong Zhang, Hao-Ran Jia, Fu-Gen Wu
Carbon nanomaterials have found numerous applications in various fields. However, their synthesis and functionalization usually require complicated procedures or tough experimental conditions. Herein, we report for the first time the synthesis of a new type of functional nanomaterial, quaternized carbon nanospheres (QCNSs), with superior antibacterial activity via a one-pot hydrothermal treatment of chitosan and hexadecylbetaine (abbreviated as BS-16). During the hydrothermal process, the direct reaction and carbonization between the amine-containing chitosan and the carboxyl-containing BS-16 were realized within only one step...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819217/anti-biofilm-effects-of-anthranilate-on-a-broad-range-of-bacteria
#2
Xi-Hui Li, Soo-Kyoung Kim, Joon-Hee Lee
Anthranilate, one of tryptophan degradation products has been reported to interfere with biofilm formation by Pseudomonas aeruginosa. Here, we investigated the effects of anthranilate on biofilm formation by various bacteria and the mechanisms responsible. Anthranilate commonly inhibited biofilm formation by P. aeruginosa, Vibrio vulnificus, Bacillus subtilis, Salmonella enterica serovar Typhimurium, and Staphylococcus aureus, and disrupted biofilms preformed by these bacteria. Because anthranilate reduced intracellular c-di-GMP and enhanced swimming and swarming motilities in P...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819202/mechanism-of-transformation-in-mycobacteria-using-a-novel-shockwave-assisted-technique-driven-by-in-situ-generated-oxyhydrogen
#3
Akshay Datey, Janardhanraj Subburaj, Jagadeesh Gopalan, Dipshikha Chakravortty
We present a novel method for shockwave-assisted bacterial transformation using a miniature oxyhydrogen detonation-driven shock tube. We have obtained transformation efficiencies of about 1.28 × 10(6), 1.7 × 10(6), 5 × 10(6), 1 × 10(5), 1 × 10(5) and 2 × 10(5) transformants/µg of DNA for Escherichia coli, Salmonella Typhimurum, Pseudomonas aeruginosa, Mycobacterium smegmatis, Mycobacterium tuberculosis (Mtb) and Helicobacter pylori respectively using this method which are significantly higher than those obtained using conventional methods...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818729/characterization-of-citrus-pectin-films-integrated-with-clove-bud-essential-oil-physical-thermal-barrier-antioxidant-and-antibacterial-properties
#4
Tanzeela Nisar, Zi-Chao Wang, Xi Yang, You Tian, Muneeb Iqbal, Yurong Guo
The increasing demand for bio-based materials to be used in food packaging has stimulated the development of novel, environmentally-friendly edible films. Antimicrobial films were developed by incorporating different levels of clove bud essential oil (0.5%, 1.0%, and 1.5%) into the citrus pectin in order to modify the functional properties of the films. Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry analysis (DSC) and X-ray diffraction (XRD) were performed, together with the determination of physical, optical, mechanical, antioxidant and antimicrobial properties of pectin emulsified films...
August 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28817943/-maldi-tof-ms-comparison-of-blood-culture-positive-bottle-pretreatment-kit
#5
Takenori Yamashita
Identification of bacteria of sepsis or bacteremia is a useful result for treatment policy. In recent years, bacterial identification has become possible from blood culture bottles by MALDI‒TOF, but it is not as accurate as bacterial identification from agar colonies. Blood culture pretreatment kit (MALDI Sepcityper Kit) is currently on sale from Bruker. However, the current situation has not reached good accuracy. This time, a new blood culture pretreatment kit appeared, so I studied. Up to now, the blood culture pretreatment kit was only MALDI Sepcityper Kit using enzyme digestion method...
August 15, 2017: JARMAM: Journal of the Association for Rapid Method and Automation in Microbiology
https://www.readbyqxmd.com/read/28816386/chemotaxis-guided-hybrid-neutrophil-micromotor-for-actively-targeted-drug-transport
#6
Jingxin Shao, Mingjun Xuan, Hongyue Zhang, Xiankun Lin, Zhiguang Wu, Qiang He
Engineering self-propelled micromotors with good biocompatibility and biodegradability for actively seeking sites of diseases and targeted drug transport remains a huge challenge. Here we demonstrate that neutrophils with intrinsic chemotaxis ability could be transformed into self-guided biohybrid motors through integrating mesoporous silica nanoparticles (MSNs) with high loading capability. To realize the compatibility of neutrophil cells with drug-loaded MSNs, bacteria membranes derived from E. coli were coated onto MSNs in advance by using a camouflaging strategy...
August 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28813014/antibacterial-properties-of-nonwoven-wound-dressings-coated-with-manuka-honey-or-methylglyoxal
#7
Sophie E L Bulman, Giuseppe Tronci, Parikshit Goswami, Chris Carr, Stephen J Russell
Manuka honey (MH) is used as an antibacterial agent in bioactive wound dressings via direct impregnation onto a suitable substrate. MH provides unique antibacterial activity when compared with conventional honeys, owing partly to one of its constituents, methylglyoxal (MGO). Aiming to investigate an antibiotic-free antimicrobial strategy, we studied the antibacterial activity of both MH and MGO (at equivalent MGO concentrations) when applied as a physical coating to a nonwoven fabric wound dressing. When physically coated on to a cellulosic hydroentangled nonwoven fabric, it was found that concentrations of 0...
August 16, 2017: Materials
https://www.readbyqxmd.com/read/28811799/diversity-physiochemical-and-phylogenetic-analyses-of-bacteria-isolated-from-various-drinking-water-sources
#8
Neveen H Eid, Huda A Al Doghaither, Taha A Kumosani, Munazza Gull
OBJECTIVE: To evaluate the indigenous bacterial strains of drinking water from the most commercial water types including bottled and filtered water that are currently used in Saudi Arabia. METHODS: Thirty randomly selected commercial brands of bottled water were purchased from Saudi local markets. Moreover, samples from tap water and filtered water were collected in sterilized glass bottles and stored at 4°C. Biochemical analyses including pH, temperature, lactose fermentation test (LAC), indole test (IND), methyl red test (MR), Voges-Proskauer test (VP), urease test (URE), catalase test (CAT), aerobic and anaerobic test (Ae/An) were measured...
May 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/28810984/impact-of-a-7-day-field-training-on-oral-health-condition-in-japan-ground-self-defense-force-personnel
#9
Koji Yamashita, Takeshi Nishiyama, Emi Nagata, Atik Ramadhani, Miki Kawada-Matsuo, Hitoshi Komatsuzawa, Takahiko Oho
INTRODUCTION: In the Japan Ground Self-Defense Force (JGSDF), personnel periodically perform intensive training that mimics the conditions seen in battle and during natural disasters. Military training involves intensive, stressful conditions, and changes in immune responses have been found in personnel following training. Good oral condition is important for military personnel to fulfill their duties; however, they have difficulty performing daily oral care under training conditions...
July 2017: Military Medicine
https://www.readbyqxmd.com/read/28806705/multiparametric-monitoring-of-microbial-faecal-pollution-reveals-the-dominance-of-human-contamination-along-the-whole-danube-river
#10
A K T Kirschner, G H Reischer, S Jakwerth, D Savio, S Ixenmaier, E Toth, R Sommer, R L Mach, R Linke, A Eiler, S Kolarevic, A H Farnleitner
The microbial faecal pollution of rivers has wide-ranging impacts on a variety of human activities that rely on appropriate river water quality. Thus, detailed knowledge of the extent and origin of microbial faecal pollution is crucial for watershed management activities to maintain safe water use. In this study, the microbial faecal pollution levels were monitored by standard faecal indicator bacteria (SFIB) along a 2580 km stretch of the Danube, the world's most international river, as well as the Danube's most important tributaries...
July 22, 2017: Water Research
https://www.readbyqxmd.com/read/28803096/upgrading-of-the-symbiosis-of-nitrosomanas-and-anammox-bacteria-in-a-novel-single-stage-partial-nitritation-anammox-system-nitrogen-removal-potential-and-microbial-characterization
#11
Yuan Liu, Qigui Niu, Shaopo Wang, Jiayuan Ji, Yu Zhang, Min Yang, Toshimasa Hojo, Yu-You Li
A novel single-stage partial nitritation-anammox process equipped with porous functional suspended carriers was developed at 25°C in a CSTR by controlling dissolved oxygen <0.3mg/L. The nitrogen removal performance was almost unchanged over a nitrogen loading rate ranging from 0.5 to 2.5kgNH4(+)-N/m(3)/d with a high nitrogen removal efficiency of 81.1%. The specific activity of AOB and anammox bacteria was of 3.00g-N/g-MLVSS/d (the suspended sludge), 3.56g-N/g-MLVSS/d (the biofilm sludge), respectively...
July 29, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28798952/prevalence-of-subclinical-mastitis-and-distribution-of-pathogens-in-dairy-farms-of-rubavu-and-nyabihu-districts-rwanda
#12
J P Mpatswenumugabo, L C Bebora, G C Gitao, V A Mobegi, B Iraguha, O Kamana, B Shumbusho
A cross-sectional study was conducted from May 2016 to January 2017 in Rubavu and Nyabihu districts, Western Rwanda, aiming at estimating the prevalence of subclinical mastitis (SCM) and identifying its causative bacteria. Management practices and milking procedures were recorded through a questionnaire. 123 crossbreed milking cows from 13 dairy farms were randomly selected and screened for SCM using California Mastitis Test (CMT). Composite CMT positive milk samples were processed for bacterial isolation and identification...
2017: Journal of veterinary medicine
https://www.readbyqxmd.com/read/28796148/pain-and-antisepsis-after-ocular-administration-of-povidone-iodine-versus-chlorhexidine
#13
Carmen Oakley, Penny Allen, Joobin Hooshmand, Brendan J T Vote
PURPOSE: To investigate ocular bacterial count before and after antisepsis with aqueous chlorhexidine (AC) or povidone-iodine (PI) and to assess discomfort with each agent. METHODS: Bacterial swabs were taken from participants' eyes before and after antisepsis. These underwent microscopy, culture, and sensitivity testing. Aqueous chlorhexidine drops were administered to left eyes and PI to right eyes. Participants rated their pain (scale 0-10) for each eye but were blinded to the type of drop...
August 8, 2017: Retina
https://www.readbyqxmd.com/read/28794903/a-novel-plant-based-sea-water-culture-media-for-in-vitro-cultivation-and-in-situ-recovery-of-the-halophyte-microbiome
#14
Mohamed Y Saleh, Mohamed S Sarhan, Elhussein F Mourad, Mervat A Hamza, Mohamed T Abbas, Amal A Othman, Hanan H Youssef, Ahmed T Morsi, Gehan H Youssef, Mahmoud El-Tahan, Wafaa A Amer, Mohamed Fayez, Silke Ruppel, Nabil A Hegazi
The plant-based-sea water culture medium is introduced to in vitro cultivation and in situ recovery of the microbiome of halophytes. The ice plant (Mesembryanthemum crystallinum) was used, in the form of juice and/or dehydrated plant powder packed in teabags, to supplement the natural sea water. The resulting culture medium enjoys the combinations of plant materials as rich source of nutrients and sea water exercising the required salt stress. As such without any supplements, the culture medium was sufficient and efficient to support very good in vitro growth of halotolerant bacteria...
November 2017: Journal of Advanced Research
https://www.readbyqxmd.com/read/28792667/highly-enantioselective-production-of-chiral-secondary-alcohols-using-lactobacillus-paracasei-bd101-as-a-new-whole-cell-biocatalyst-and-evaluation-of-their-antimicrobial-effects
#15
Durmuşhan Yılmaz, Engin Şahin, Enes Dertli
Chiral secondary alcohols are valuable intermediates for many important enantiopure pharmaceuticals and biologically active molecules. In this work, we studied asymmetric reduction of aromatic ketones to produce the corresponding chiral secondary alcohols using lactic acid bacteria (LAB) as new biocatalysts. Seven LAB strains were screened for their ability to reduce acetophenones to their corresponding alcohols. Among these strains Lactobacillus paracasei BD101, was found to be the most successful at reducing the ketones to the corresponding alcohols...
August 9, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28783564/improved-methane-production-from-sugarcane-vinasse-with-filter-cake-in-thermophilic-uasb-reactors-with-predominance-of-methanothermobacter-and-methanosarcina-archaea-and-thermotogae-bacteria
#16
Valciney Gomes de Barros, Rose Maria Duda, Juliana da Silva Vantini, Wellington Pine Omori, Maria Inês Tiraboschi Ferro, Roberto Alves de Oliveira
Biogas production from sugarcane vinasse has enormous economic, energy, and environmental management potential. However, methane production stability and biodigested vinasse quality remain key issues, requiring better nutrient and alkalinity availability, operational strategies, and knowledge of reactor microbiota. This study demonstrates increased methane production from vinasse through the use of sugarcane filter cake and improved effluent recirculation, with elevated organic loading rates (OLR) and good reactor stability...
July 24, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28782223/how-and-why-patients-self-treat-chronic-wounds
#17
Suzanne Kapp, Nick Santamaria
The aim of this study was to investigate how people self-treat chronic wounds, why they self-treat and the assistance and support that they receive. The increasing emphasis on self-management of chronic conditions, the potential benefits of self-treatment to the health care consumer and competing demands on health care funding are good reasons to investigate self-treatment of chronic wounds as we have little data on this group of individuals. A survey study was conducted in Australia. A non-random sample of 100 participants was recruited...
August 6, 2017: International Wound Journal
https://www.readbyqxmd.com/read/28779830/role-of-procalcitonin-in-the-management-of-infected-patients-in-the-intensive-care-unit
#18
REVIEW
David N Gilbert
The combination of molecular pathogen diagnostics and the biomarker procalcitonin (PCT) are changing the use of antimicrobials in patients admitted to critical care units with severe community-acquired pneumonia, possible septic shock, or other clinical syndromes. An elevated serum PCT level is good supportive evidence of a bacterial pneumonia, whereas a low serum PCT level virtually eliminates an etiologic role for bacteria even if the culture for a potential bacterial pathogen is positive. Serum PCT levels can be increased in any shocklike state; a low PCT level eliminates invasive bacterial infection as an etiology in more than 90% of patients...
September 2017: Infectious Disease Clinics of North America
https://www.readbyqxmd.com/read/28773930/multi-layered-tio%C3%A2-films-towards-enhancement-of-escherichia-coli-inactivation
#19
Sorachon Yoriya, Angkana Chumphu, Pusit Pookmanee, Wreerat Laithong, Sirichai Thepa, Roongrojana Songprakorp
Crystalline TiO₂ has shown its great photocatalytic properties in bacterial inactivation. This work presents a design fabrication of low-cost, layered TiO₂ films assembled reactors and a study of their performance for a better understanding to elucidate the photocatalytic effect on inactivation of E. coli in water. The ability to reduce the number of bacteria in water samples for the layered TiO₂ composing reactors has been investigated as a function of time, while varying the parameters of light sources, initial concentration of bacteria, and ratios of TiO₂ film area and volume of water...
September 30, 2016: Materials
https://www.readbyqxmd.com/read/28773026/biosynthesis-and-characterization-of-agnps-silk-pva-film-for-potential-packaging-application
#20
Gang Tao, Rui Cai, Yejing Wang, Kai Song, Pengchao Guo, Ping Zhao, Hua Zuo, Huawei He
Bionanocomposite packaging materials have a bright future for a broad range of applications in the food and biomedical industries. Antimicrobial packaging is one of the bionanocomposite packaging materials. Silver nanoparticle (AgNP) is one of the most attractive antimicrobial agents for its broad spectrum of antimicrobial activity against microorganisms. However, the traditional method of preparing AgNPs-functionalized packaging material is cumbersome and not environmentally friendly. To develop an efficient and convenient biosynthesis method to prepare AgNPs-modified bionanocomposite material for packaging applications, we synthesized AgNPs in situ in a silk fibroin solution via the reduction of Ag⁺ by the tyrosine residue of fibroin, and then prepared AgNPs-silk/poly(vinyl alcohol) (PVA) composite film by blending with PVA...
June 17, 2017: Materials
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