keyword
MENU ▼
Read by QxMD icon Read
search

UV

keyword
https://www.readbyqxmd.com/read/29778081/molecular-aspect-of-silver-nanoparticles-regulated-embryonic-development-in-zebrafish-danio-rerio-by-oct-4-expression
#1
Biplab Sarkar, Suresh K Verma, Javed Akhtar, Surya Prakash Netam, Sanjay Kr Gupta, Pritam Kumar Panda, Koel Mukherjee
With the enhancement of commercial manifestation of silver nanoparticles, concerned has risen on their accumulation in aquatic system and consequent effects on fish development and metabolism. In this study, experiments were conducted to assess the impacts of silver nanoparticles on early life cycles of fish considering Zebrafish (Danio rerio) as experimental model. Silver nanoparticles were synthesized through chemical reduction method and characterized through UV-visible spectroscopy, dynamic light scattering (DLS), and HR-TEM...
May 4, 2018: Chemosphere
https://www.readbyqxmd.com/read/29778044/electrodeposited-styrylquinolinium-dye-as-molecular-electrocatalyst-for-coupled-redox-reactions
#2
Yolina Hubenova, Rumyana Bakalska, Mario Mitov
Modification of carbonaceous materials with different conductive coatings is a successful approach to enhance their electrocatalytic activity and thus to increase the electrical outputs when used as electrodes in biofuel cells. In this study, a methodology for electrodeposition of styrylquinolinium dye on carbon felt was developed. The produced dye electrodeposits were characterized by means of AFM, ESI-MS/MS and NMR spectroscopy. The obtained data reveal that the dye forms overlaid layers consisting of monomer molecules most likely with an antiparallel orientation...
May 10, 2018: Bioelectrochemistry
https://www.readbyqxmd.com/read/29778037/efficient-electrochemical-degradation-of-multiwall-carbon-nanotubes
#3
Vytas Reipa, Shannon K Hanna, Aaron Urbas, Lane Sander, John Elliott, Joseph Conny, Elijah J Petersen
As the production mass of multiwall carbon nanotubes (MWCNT) increases, the potential for human and environmental exposure to MWCNTs may also increase. We have shown that exposing an aqueous suspension of pristine MWCNTs to an intense oxidative treatment in an electrochemical reactor, equipped with an efficient hydroxyl radical generating Boron Doped Diamond (BDD) anode, leads to their almost complete mineralization. Thermal optical transmittance analysis showed a total carbon mass loss of over two orders of magnitude due to the electrochemical treatment, a result consistent with measurements of the degraded MWCNT suspensions using UV-vis absorbance...
April 26, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29778020/eosin-y-sensitized-core-shell-tio-2-zno-nano-structured-photoanodes-for-dye-sensitized-solar-cell-applications
#4
V S Manikandan, Akshaya K Palai, Smita Mohanty, Sanjay K Nayak
In the current investigation, TiO2 and TiO2 -ZnO (core-shell) spherical nanoparticles were synthesized by simple combined hydrolysis and refluxing method. A TiO2 core nanomaterial on the shell material of ZnO was synthesized by utilizing variable ratios of ZnO. The structural characterization of TiO2 -ZnO core/shell nanoparticles were done by XRD analysis. The spherical structured morphology of the TiO2 -ZnO has been confirmed through field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) studies...
May 3, 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29777941/characterization-of-the-binding-of-a-novel-antitumor-drug-ibrutinib-with-human-serum-albumin-insights-from-spectroscopic-calorimetric-and-docking-studies
#5
Bin Tang, Peixiao Tang, Jiawei He, Hongqin Yang, Hui Li
Ibrutinib (IBR) is a novel Bruton's tyrosine kinase inhibitor and shows good efficacy for several B-cell malignancies. In the current study, the molecular mechanism of the interaction between IBR and the transport protein human serum albumin (HSA) was ascertained by spectroscopic, calorimetric, and docking studies. Detailed investigations on affinity parameter, binding model, conformational change, and site selectivity were implemented by receptor-based and ligand-based analysis. An unusual fluorescence co-quenching (mutual quenching) was observed in the binding of IBR to HSA, followed by a static mechanism...
May 16, 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29777933/novel-amidine-derivatives-of-benzanthrone-effect-of-bromine-atom-on-the-spectral-parameters
#6
E M Kirilova, A I Puckins, E Romanovska, M Fleisher, S V Belyakov
Several new substituted amidine derivatives of benzanthrone were synthesized by condensation reaction from 2-bromo-3-aminobenzo[de]anthracen-7-one and appropriate aromatic or aliphatic amides. The novel benzanthrone derivatives were characterized by TLC analysis, NMR, IR, MS, UV/Vis, and fluorescence spectroscopy. The obtained derivatives have yellow or orange fluorescence in organic solvents. The solvent effect on photophysical behaviors of these dyes was investigated, and the results showed that the introduction of a bromine atom causes a blue-shift of the absorption and emission bands and decrease in the fluorescent quantum yield in comparison with unbromated analogues...
May 9, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29777929/substituent-effect-on-the-acid-induced-isomerization-of-spiropyran-compounds
#7
Lixia Cui, Honghong Zhang, Guomei Zhang, Ying Zhou, Li Fan, Lihong Shi, Caihong Zhang, Shaomin Shuang, Chuan Dong
Spiropyran compounds are well known as an isomeric system, the closed spiropyran (SP) could be converted into the open merocyanine (MC) via acid-induced because stable protonated merocyanine (MCH) were formed by combination of MC and H+ . In order to understand how the substituent affect the isomerization of spiropyran. A series of the chromene 7-subsituted spiropyran compounds were designed and synthesized. The photophysical properties of them were studied comparatively by UV-absorption and fluorescence spectra in different pH...
May 16, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29777812/exploring-the-intermolecular-interactions-and-contrasting-binding-of-flufenamic-acid-with-hemoglobin-and-lysozyme-a-biophysical-and-docking-insight
#8
Sameer Shakeel Ansari, Imtiyaz Yousuf, Farukh Arjmand, Mohammad Khursheed Siddiqi, Saeeda Naqvi
The intermolecular interaction of flufenamic acid (Hfluf) with two model proteins i.e., hemoglobin and lysozyme was explored using fluorescence, UV-vis, circular dichroism, DLS, and molecular docking techniques. The corroborative spectroscopic techniques suggested efficient binding of Hfluf to both the proteins. The S-V plot in Hb-Hfluf system showed positive deviation highlighting the presence of both static and dynamic quenching. Hence, ground state complex model and sphere of action quenching model were used for the study...
May 16, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29777156/high-quality-3d-photonics-using-nano-imprint-lithography-of-fast-sol-gel-materials
#9
Ofer Bar-On, Philipp Brenner, Tobias Siegle, Raz Gvishi, Heinz Kalt, Uli Lemmer, Jacob Scheuer
A method for the realization of low-loss integrated optical components is proposed and demonstrated. This approach is simple, fast, inexpensive, scalable for mass production, and compatible with both 2D and 3D geometries. The process is based on a novel dual-step soft nano imprint lithography process for producing devices with smooth surfaces, combined with fast sol-gel technology providing highly transparent materials. As a concrete example, this approach is demonstrated on a micro ring resonator made by direct laser writing (DLW) to achieve a quality factor improvement from one hundred thousand to more than 3 million...
May 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29776674/migration-behavior-of-organic-dyes-based-on-physicochemical-properties-of-solvents-as-background-electrolytes-in-non-aqueous-capillary-electrophoresis
#10
Minjeong Gu, Keunchang Cho, Seong Ho Kang
The migration behavior of organic fluorescent dyes (i.e., crystal violet, methyl violet base, methyl violet B base, rhodamine 6G, and rhodamine B base) in non-aqueous capillary electrophoresis (NACE) was investigated by focusing on the physicochemical properties of various organic solvents [ethanol, methanol, 2-propanol, dimethylformamide (DMF), and dimethyl sulfoxide (DMSO)] in background electrolyte (BGE). Laser-induced fluorescence (LIF) and UV/Vis detectors were employed to observe both the migration time of organic dyes and the electroosmotic flow (EOF) in NACE, respectively...
May 15, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29776421/evidence-for-a-hyper-reductive-redox-in-a-sub-set-of-heart-failure-patients
#11
Thiagarajan Sairam, Amit N Patel, Meenu Subrahmanian, Rajendiran Gopalan, Steven M Pogwizd, Sudha Ramalingam, Ramalingam Sankaran, Namakkal Soorapan Rajasekaran
BACKGROUND: Oxidative stress has been linked to heart failure (HF) in humans. Antioxidant-based treatments are often ineffective. Therefore, we hypothesize that some of the HF patients might have a reductive stress (RS) condition. Investigating RS-related mechanisms will aid in personalized optimization of redox homeostasis for better outcomes among HF patients. METHODS: Blood samples were collected from HF patients (n = 54) and healthy controls (n = 42) and serum was immediately preserved in - 80 °C for redox analysis...
May 18, 2018: Journal of Translational Medicine
https://www.readbyqxmd.com/read/29775930/synthesis-photophysical-and-electrochemical-properties-of-a-blue-emitter-with-binaphthalene-and-carbazole-units
#12
Lixia Guo, Xiaoju Wang, Liheng Feng
A blue emitter, 3,3'-(2,2'-dimethoxy-[1,1'-binaphthalene]-6,6'-diyl)bis(9-benzyl-9H-carbazole), was synthesized by Suzuki coupling reaction. The photophysical properties of the emitter in solution were firstly investigated by UV-Vis absorption and fluorescence emission techniques. The results indicate that the emitter has excellent optical and electron transfer properties. The maximum absorption and emission peaks of the emitter are 302 nm and 406 nm with 67.4% fluorescence quantum yield in chloroform, respectively...
May 10, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29775881/mass-flow-based-removal-and-transformation-potentials-for-tbbpa-hbcds-and-pbdes-during-wastewater-treatment-processes
#13
Un-Jung Kim, Jeong-Eun Oh
At a sewage treatment plant, 27 polybrominated diphenyl ethers, 17 methoxylated brominated diphenyl ethers, nine hydroxylated brominated diphenyl ethers, three hexabromocyclododecane diastereomers, and tetrabromobisphenol A were monitored at five major treatment stages (the influent, primary settlement stage, biological reaction stage, secondary settlement stage, and the UV irradiation disinfection stage). Hexabromocyclododecanes were the dominant chemicals, contributing 40% of the total concentrations of the chemicals in the dissolved phase of the sewage...
April 10, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29775880/photocatalytic-reductive-dechlorination-of-2-chlorodibenzo-p-dioxin-by-pd-modified-g-c-3-n-4-photocatalysts-under-uv-vis-irradiation-efficacy-kinetics-and-mechanism
#14
Jiafeng Ding, Gaoyuan Long, Yang Luo, Runze Sun, Mengxia Chen, Yajun Li, Yanfang Zhou, Xinhua Xu, Weirong Zhao
Polychlorinated dibenzo-p-dioxins (PCDDs), as a group of notorious anthropogenic environmental toxicants, are arguably ubiquitous in nature. In this study, we investigated the photocatalytic reductive dechlorination of 2-chlorodibenzo-p-dioxin (2-CDD) over Pd/g-C3 N4 catalysts under UV-vis irradiation. The g-C3 N4 and a series of Pd/g-C3 N4 catalysts were prepared by thermal polymerization and mechanical mixing-illumination method and characterized by XRD, TEM, BET, SEM and UV-vis DRS analyses. Among all the samples, the Pd/g-C3 N4 (5 wt%) yielded the optimal dechlorination activity with a total 2-CDD conversion of 54% within 4 h, and 76% of those converted 2-CDD were evolved to dibenzo-p-dioxin (DD)...
May 9, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29775822/nanocomposite-thin-films-ag-0-np-tio-2-in-the-efficient-removal-of-micro-pollutants-from-aqueous-solutions-a-case-study-of-tetracycline-and-sulfamethoxazole-removal
#15
Alka Tiwari, Alok Shukla, Lalliansanga, Diwakar Tiwari, Seung Mok Lee
The aim of this communication is to synthesize novel Nanocomposite thin film materials (Ag0 (NP)/TiO2 ) using the template process. Surface morphology of materials was obtained by the Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) analyses. The presence of doped Ag-nanoparticles was confirmed by the TEM images along with the SEM-EDX analyses. The Atomic Force Microscopic images were demonstrated the surface roughness and thickness of Nanocomposite thin films. X-ray diffraction analysis confirmed that TiO2 was predominantly present to its anatase mineral phase...
May 15, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29775763/photoreceptor-mediated-regulation-of-the-cop1-spa-e3-ubiquitin-ligase
#16
REVIEW
Roman Podolec, Roman Ulm
Plants have evolved specific photoreceptors that capture informational cues from sunlight. The phytochrome, cryptochrome, and UVR8 photoreceptors perceive red/far-red, blue/UV-A, and UV-B light, respectively, and control overlapping photomorphogenic responses important for plant growth and development. A major repressor of such photomorphogenic responses is the E3 ubiquitin ligase formed by CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) and SUPPRESSOR OF PHYA-105 (SPA) proteins, which acts by regulating the stability of photomorphogenesis-promoting transcription factors...
May 15, 2018: Current Opinion in Plant Biology
https://www.readbyqxmd.com/read/29775760/synthesis-of-axially-disubstituted-silicon-phthalocyanines-and-investigation-of-photodynamic-effects-on-hct-116-colorectal-cancer-cell-line
#17
Ceren Sarı, Figen Celep Eyüpoğlu, İsmail Değirmencioğlu, Rıza Bayrak
Photodynamic therapy is one of the hot topics in cancer studies recently. Basically, photosensitizing chemical substrates which are stimulated by light having a specific wavelength cause fatal effect on different kind of cells in photodynamic therapy. In this study, axially 4-{[(1E)-2-furylmethylene]amino}phenol, 4-{[(1E)-2-thienylmethylene]amino}phenol and 4-{[(1E)-(4-nitro-2-thienyl)methylene]amino}phenol disubstituted silicon phthalocyanines were synthesized as Photosensitizers for photodynamic therapy in cancer treatment for the first time...
May 15, 2018: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/29775727/isolation-structure-elucidation-and-antibacterial-activity-of-methyl-4-8-dimethylundecanate-from-the-marine-actinobacterium-streptomyces-albogriseolus-ecr64
#18
Durairaj Thirumurugan, Ramasamy Vijayakumar, Chithravel Vadivalagan, Pushparaj Karthika, Md Khurshid Alam Khan
Around 120 actinobacterial colonies were isolated from various regions of marine East coast region of Tamil Nadu, India. Among them, 33 were morphologically distinct and they were preliminarily screened for their antibacterial activity against Pseudomonas fluorescens, Vibrio cholerae, V. parahaemolyticus, V. alginolyticus, and Aeromonas hydrophila by cross-streak plate technique. Among the isolated, the isolate ECR64 exhibited maximum zone of inhibition against fish pathogenic bacteria. The crude bioactive compounds were extracted from the isolate ECR64 using different organic solvents which exhibited maximum antibacterial activity...
May 15, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29775719/the-characteristics-and-antioxidation-of-oudemansiella-radicata-selenium-polysaccharides-on-lipopolysaccharide-induced-endo-toxemic-mice
#19
Zheng Gao, Chen Zhang, Hui Liu, Yongfa Zhu, Zhenzhen Ren, Huijuan Jing, Shangshang Li, Jianjun Zhang, Xingtian Liu, Le Jia
The selenium polysaccharides (SPS) by Oudemansiella radicata were isolated, and two hydrolysates (enzymatic-SPS (ESPS) and acidic-SPS (ASPS)) were obtained by enzymolysis and acidolysis. The endo-toxemic-induced lung and kidney damages were successfully established by the lipopolysaccharides (LPS) injection (5 mg/kg/d). The in vivo mice experiments indicated that the ESPS showed superior antioxidant and protective effects against the LPS-toxicities by increasing the antioxidant activities, reducing lipid peroxidation, improving the inflammatory response and elevating the kidney and lung functions than SPS and ASPS...
May 15, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29775569/modification-of-chickpea-cystatin-by-reactive-dicarbonyl-species-glycation-oxidation-and-aggregation
#20
Sheraz Ahmad Bhat, Waseem Feeroze Bhat, Mohammad Afsar, Mohd Shahnawaz Khan, Bilqees Bano
Reactive dicarbonyl species such as methylglyoxal (MGO) and glyoxal (GO) have recently received extensive attention due to their high reactivity and ability to modify biological substances such as proteins, phospholipids, and DNA. In case of proteins these reactive species mainly react with lysine and arginine residues to form AGEs, oxidative products, and aggregates. Chickpea cystatin (CPC) was incubated with varying concentrations of glyoxal and methylglyoxal which caused, along with altered secondary and tertiary structures, glycation, functional inactivation, altered redox state, cross-linking and high-molecular-mass aggregation...
May 15, 2018: Archives of Biochemistry and Biophysics
keyword
keyword
56252
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"