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https://www.readbyqxmd.com/read/29031224/direct-one-pot-synthesis-of-cinnamaldehyde-immobilized-on-gold-nanoparticles-and-their-antibiofilm-properties
#1
Mohankandhasamy Ramasamy, Jin-Hyung Lee, Jintae Lee
The objective of the present study was to develop a one-pot strategy to synthesis gold nanoparticle complexes using cinnamaldehyde, a potent antibiofilm agent which in its free form, exhibits high volatility and unstable nature. Hence, we developed cinnamaldehyde gold nanoparticles (CGNPs) in a single step to overcome the limitations of free cinnamaldehyde. Furthermore, reduction abilities of cinnamaldehyde under different experimental conditions, that is, varying precursor concentrations of cinnamaldehyde and gold, metal salts, pH, temperature, and light sources, were investigated...
October 6, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29031222/apolipoproteins-adsorption-and-brain-targeting-evaluation-of-baicalin-nanocrystals-modified-by-combination-of-tween80-and-tpgs
#2
Yang Liu, Yueqin Ma, Junnan Xu, Yingchong Chen, Jin Xie, Pengfei Yue, Qin Zheng, Ming Yang
To help baicalin pass across BBB and improve its targeting in brain, we designed a novel formulation strategy of baicalin nanocrystals that preferentially adsorbing apolipoprotein E (ApoE) and repelling protein adsorption of opsonins. Intravenous baicalin nanocrystals suspensions (BCL-NS) modified by different surfactant were prepared by high-pressure homogenization. The targeting potential of surface-modified BCL-NS with mean particles size of about 250nm was assessed by in vitro protein adsorption studies using two-dimensional polyacrylamide gel electrophoresis (2-D PAGE), and further evaluated in vivo pharmacokinetics...
October 5, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29031212/a-comprehensive-analysis-of-direct-and-photosensitized-attenuation-of-toxoplasma-gondii-tachyzoites
#3
Juan G Yañuk, M Lis Alomar, M Micaela Gonzalez, Andrés M Alonso, Sergio O Angel, Verónica M Coceres, Franco M Cabrerizo
In the present work, we have evaluated the effect of three different types of radiation: UVC (254±5nm), UVA (365±20nm) and visible (420±20nm) on different morphological and biological functions of Toxoplasma gondii tachyzoites. Briefly, UVC and UVA showed an inhibitory effect on parasite invasion in a dose-dependent manner. UVC showed the strongest effect inducing both structural damage (antigens) and functional inhibition (i.e., invasion and replication). On its own, visible light induces a quite distinctive and selective pattern of parasite-attenuation...
October 7, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29031154/thermally-stable-microemulsions-comprising-imidazolium-based-surface-active-ionic-liquids-non-polar-ionic-liquid-and-ethylene-glycol-as-polar-phase
#4
Manvir Kaur, Gurbir Singh, Sandeep Kumar, Navnidhi, Tejwant Singh Kang
Ionic liquid (IL), 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, [C2mim] [Tf2N], as a non-polar phase in conjunction with polar ethylene glycol (EG) forms microemulsions stabilized by surface active ionic liquids (SAILs), N-methyl-N-alkylimidazolium chlorides, [Cnmim] [Cl], where n = 8, 12 and 16 in conjunction with decanol as co-surfactant. The phase behaviour of the ternary systems has been investigated and three regions of microemulsions - polar-in-ionic liquid, bicontinuous and ionic liquid-in-polar, have been identified using electrical conductivity measurements...
October 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29031149/highly-efficient-photocatalysis-toward-tetracycline-of-nitrogen-doped-carbon-quantum-dots-sensitized-bismuth-tungstate-based-on-interfacial-charge-transfer
#5
Jin Zhang, Xingzhong Yuan, Longbo Jiang, Zhibin Wu, Xiaohong Chen, Hou Wang, Hui Wang, Guangming Zeng
In this study, a novel N-CQDs/Bi2WO6 was synthesized through a facile hydrothermal method. Multiple techniques were applied to investigate the structures, morphologies, optical and electronic properties and photocatalytic performance of as-prepared samples. The results indicated that the hybrid materials were formed with N-CQDs attached on the surface of sphere-like Bi2WO6. The photocatalytic activity of N-CQDs/Bi2WO6 materials was evaluated sufficiently by using tetracycline (TC) as target organic pollutant...
September 22, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29031146/facile-synthesis-of-two-clay-minerals-supported-graphitic-carbon-nitride-composites-as-highly-efficient-visible-light-driven-photocatalysts
#6
Zhiming Sun, Chunquan Li, Xin Du, Shuilin Zheng, Guifang Wang
To overcome rapid electron-hole recombination and low adsorption capacity of single g-C3N4 photocatalyst, the present work reports on the fabrication of two kinds of visible-light-driven composite photocatalysts (g-C3N4/kaolinite and g-C3N4/illite composites). 2D/2D assembly was successfully achieved in this work. Furthermore, the as-synthesized composites exhibited significantly enhanced photocatalytic activity under visible-light irradiation, whose reaction rate constants were almost 4.13 times (g-C3N4/kaolinite) and 3...
October 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29031134/the-positive-relationships-between-plant-coverage-species-richness-and-aboveground-biomass-are-ubiquitous-across-plant-growth-forms-in-semi-steppe-rangelands
#7
Anvar Sanaei, Arshad Ali, Mohammad Ali Zare Chahouki
The positive relationships between biodiversity and aboveground biomass are important for biodiversity conservation and greater ecosystem functioning and services that humans depend on. However, the interaction effects of plant coverage and biodiversity on aboveground biomass across plant growth forms (shrubs, forbs and grasses) in natural rangelands are poorly studied. Here, we hypothesized that, while accounting for environmental factors and disturbance intensities, the positive relationships between plant coverage, biodiversity, and aboveground biomass are ubiquitous across plant growth forms in natural rangelands...
October 11, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29031117/reactions-of-melolontha-hippocastani-adults-to-high-manganese-content-in-food
#8
Petr Martinek, Emanuel Kula, Josef Hedbávný
Rapid adaptation of insect species to environmental changes can be advantageous for their development. Forest cockchafer (Melolontha hippocastani) is herbivorous insect species with high food intake that has been widely studied within European conditions. It can cause huge economic and ecological losses especially in oak-dominated forest stands. Food preference of this species is mainly comprised of trees with a potential to accumulate manganese in their assimilation apparatus. In order to determine cockchafer's reactions to increased Mn concentration in its food, the adults were reared in laboratory conditions controlled for temperature, humidity, and light on a natural diet of oak (Quercus petraea) leaves...
October 11, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29031116/evaluation-of-fluoride-bioremediation-and-production-of-biomolecules-by-living-cyanobacteria-under-fluoride-stress-condition
#9
Gargi Biswas, Sohini Guha Thakurta, Jitamanyu Chakrabarty, Kalyan Adhikari, Susmita Dutta
Application of microalgae for defluoridation has gained interest in recent years. In the present study, bioremediation of fluoride using living cyanobacteria, Starria zimbabweensis, collected from wastewater of coke-oven effluent treatment plant, Durgapur, India, has been investigated. Initially, the cyanobacterial strain was grown in BG11 medium at 25°C, 45μmol/m(2)/s irradiation in 18h: 6h light:dark cycle in an algal incubator. Samples were withdrawn after 2 days interval and analyzed for its dry biomass and lipid content...
October 11, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29031093/three-dimensional-ag2o-bi5o7i-p-n-heterojunction-photocatalyst-harnessing-uv-vis-nir-broad-spectrum-for-photodegradation-of-organic-pollutants
#10
Yannan Chen, Gangqiang Zhu, Mirabbos Hojamberdiev, Jianzhi Gao, Runliang Zhu, Chenghui Wang, Xiumei Wei, Peng Liu
Ag2O nanoparticles-loaded Bi5O7I microspheres forming a three dimensional Ag2O/Bi5O7I p-n heterojunction photocatalyst with wide-spectrum response were synthesized in this study. The results of transmission electron microscopy observations revealed that the Ag2O nanoparticles with the diameter of ca. 10-20nm were distributed on the surfaces of Bi5O7I nanosheets. The as-synthesized Ag2O/Bi5O7I exhibited an excellent wide-spectrum response to wavelengths ranging from ultraviolet (UV) to near-infrared (NIR), indicating its potential for effective utilization of solar energy...
October 7, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29031069/synthesis-and-biological-evaluation-of-a-platinum-ii-c-rgdyk-conjugate-for-integrin-targeted-photodynamic-therapy
#11
T Chatzisideri, S Thysiadis, S Katsamakas, P Dalezis, I Sigala, T Lazarides, E Nikolakaki, D Trafalis, O A Gederaas, M Lindgren, V Sarli
A cancer-targeting conjugate 4 of a cyclometalated [N,C,N-Pt(II)] complex bearing a NˆCˆN 1,3-di(2-pyridyl)-benzene with c(RGDyK) peptide as guiding molecule was designed and synthesized for real-time drug delivery monitoring in cancer cells and photodynamic therapy (PDT). This conjugate demonstrates a mild cytostatic effect to six cancer cell lines expressing integrins at different extent, while possessing promising features for PDT. Conjugate 4 demonstrated rapid cell uptake by receptor-mediated endocytosis and efficient generation of (1)O2 upon irradiation...
September 28, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29031035/-controversy-in-the-postoperative-treatment-of-low-grade-gliomas
#12
T Kazda, R Lakomý, A Poprach, P Pospíšil, R Jančálek, P Šlampa
BACKGROUND: The optimal treatment for low-grade gliomas remains controversial. Neurosurgery, radiotherapy, and chemotherapy are the main treatment options. Despite advances in oncology, there are still a lot of uncertainties, and the optimal sequences, combinations, and timings of these procedures have not yet been optimized. It is still unclear whether temozolomide can replace effective, but toxic PCV chemotherapy (procarbazine, lomustine, vincristine) and whether temozolomide can be used upfront alone instead of radiotherapy alone...
2017: Klinická Onkologie: Casopis Ceské a Slovenské Onkologické Spolecnosti
https://www.readbyqxmd.com/read/29029366/directly-coupled-vs-spectator-linkers-on-diimine-pt-ii-acetylides-change-the-structure-keep-the-function
#13
Stuart Archer, Theo Keane, Milan Delor, Elizabeth Bevon, Alexander Auty, Dimitri Chekulaev, Igor Sazanovich, Michael Towrie, Antony Meijer, Julia Weinstein
A series of [Donor-Acceptor-Anchor] Platinum(II) bipy (bis)acetylides has been developed in order to systematically compare the effect of conjugated vs. electronically decoupled modes of attachment of protected anchoring groups on the photophysical properties of these light-harvesting units. This first example of "decoupled" phosphonate-diimine Pt(II) complexes presented here are compared and contrasted to their carboxylate analogs. Ultrafast TRIR and femtosecond transient absorption spectroscopies revealed that all complexes possess a charge transfer lowest excited state, with lifetimes between 2 and 14 ns...
October 13, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29029360/laser-desorption-ionization-mass-spectrometry-recent-progress-in-matrix-free-and-label-assisted-techniques
#14
REVIEW
Arundhoti Mandal, Monisha Singha, Partha Sarathi Addy, Amit Basak
The MALDI-based mass spectrometry, over the last three decades, has become an important analytical tool. It is a gentle ionization technique, usually applicable to detect and characterize analytes with high molecular weights like proteins and other macromolecules. The earlier difficulty of detection of analytes with low molecular weights like small organic molecules and metal ion complexes with this technique arose due to the cluster of peaks in the low molecular weight region generated from the matrix. To detect such molecules and metal ion complexes, a four-prong strategy has been developed...
October 13, 2017: Mass Spectrometry Reviews
https://www.readbyqxmd.com/read/29029340/circadian-phase-and-phase-angle-disorders-in-primary-insomnia
#15
Erin E Flynn-Evans, Julia A Shekleton, Belinda Miller, Lawrence J Epstein, Douglas Kirsch, Lauren A Brogna, Liza M Burke, Erin Bremer, Jade M Murray, Philip Gehrman, Shantha M W Rajaratnam, Steven W Lockley
Objectives: We aimed to identify the prevalence of circadian phase and phase angle abnormalities in patients with insomnia. Methods: We conducted a cross-sectional, multicenter study at three sleep laboratories in the United States and Australia. Patients with insomnia and healthy control participants completed a sleep log for seven days. Circadian phase was assessed from salivary Dim Light Melatonin Onset (DLMO) time during a 12-hour laboratory visit. Results: Seventy-nine patients meeting the Research Diagnostic Criteria for Primary, Psychophysiological, Paradoxical, and/or Idiopathic Childhood Insomnia (46F, 35...
October 3, 2017: Sleep
https://www.readbyqxmd.com/read/29029332/identification-of-a-novel-subset-of-myeloid-derived-suppressor-cells-during-chronic-staphylococcal-infection-that-resembles-immature-eosinophils
#16
Oliver Goldmann, Andreas Beineke, Eva Medina
We have previously reported that myeloid-derived suppressor cells (MDSC), which are a heterogeneous population of immunosuppressive immature myeloid cells, expanded during chronic Staphylococcus aureus infection and promoted bacterial persistence by inhibiting effector T cells. Two major MDSC subsets including monocytic MDSCs (M-MDSC) and granulocytic MDSCs (G-MDSC) have been described to date. Here, we identified a new subset of MDSC (Eo-MDSC) in S. aureus-infected mice that phenotypically resembles eosinophils...
September 23, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29029319/new-records-of-phlebotomine-sand-flies-diptera-psychodidae-from-the-state-of-alagoas-northeast-of-brazil
#17
Moises Thiago de Souza Freitas, Carlos Fernando Rocha Dos Santos, Edilberto Marinho de Andrade, Carlos Brisola Marcondes, Valdir de Queiroz Balbino, Felipe Arley Costa Pessoa
Phlebotomine sand flies are small insects of great medical importance. This study presents new records of phlebotomine sand flies, which augment the list of species, recorded in the state of Alagoas, Brazil. Sand flies were collected using CDC miniature light traps. Collections were made between November 2008 and April 2016, in 47 municipalities within the state of Alagoas. Twenty-seven thousand two-hundred forty-four sand flies were collected, representing 18 species in seven genera. Lutzomyia longipalpis was the predominant species (85...
October 4, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29029302/acute-kynurenine-challenge-disrupts-sleep-wake-architecture-and-impairs-contextual-memory-in-adult-rats
#18
Ana Pocivavsek, Annalisa M Baratta, Jessica A Mong, Shaun S Viechweg
Study Objectives: Tryptophan metabolism via the kynurenine pathway may represent a key molecular link between sleep loss and cognitive dysfunction. Modest increases in the kynurenine pathway metabolite kynurenic acid (KYNA), which acts as an antagonist at N-methyl-d-aspartate and α7 nicotinic acetylcholine receptors in the brain, result in cognitive impairments. As glutamatergic and cholinergic neurotransmissions are critically involved in modulation of sleep, our current experiments tested the hypothesis that elevated KYNA adversely impacts sleep quality...
September 28, 2017: Sleep
https://www.readbyqxmd.com/read/29029290/nmda-receptor-mediated-ca2-influx-in-the-absence-of-mg2-block-disrupts-rest-activity-rhythms-in-drosophila
#19
Qian Song, Ge Feng, Jiaxing Zhang, Xuechun Xia, Min Ji, Lei Lv, Yong Ping
Introduction: The correlated activation of pre- and postsynaptic neurons is essential for the NMDA receptor-mediated Ca2+ influx by removing Mg2+ from block site and NMDA receptors have been implicated in phase resetting of circadian clocks. So we assessed rest:activity rhythms in Mg2+ block defective animals. Methods: Using Drosophila locomotor monitoring system, we checked circadian rest:activity rhythms of different mutants under constant darkness (DD) and light:dark (LD) conditions...
October 3, 2017: Sleep
https://www.readbyqxmd.com/read/29029234/keeping-education-fresh-not-just-in-microbiology
#20
Beatrix Fahnert
Innovative practice from around the globe, addressing a range of recent educational themes and trends, was published in the FEMS Microbiology Letters virtual Thematic Issue ''Keeping Education Fresh' in October 2017. Its thought-provoking content is reviewed here to more directly facilitate reflections and discussions in the professional community. The focus is on best practice approaches when enhancing student engagement, how to adjust those to the diversity of learners, learning situations and infrastructures, and to a broad range of subjects...
October 4, 2017: FEMS Microbiology Letters
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