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Journal of Photochemistry and Photobiology. B, Biology

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https://www.readbyqxmd.com/read/29156345/the-extended-production-of-uv-induced-reactive-oxygen-species-in-l929-fibroblasts-is-attenuated-by-posttreatment-with-arrabidaea-chica-through-scavenging-mechanisms
#1
Fabianne Martins Ribeiro, Hélito Volpato, Danielle Lazarin-Bidóia, Vânia Cristina Desoti, Rebeca Oliveira de Souza, Maria José Vieira Fonseca, Tânia Ueda-Nakamura, Celso Vataru Nakamura, Sueli de Oliveira Silva
Ultraviolet radiation (UVR) exposure causes various injurious effects to human skin by generating reactive oxygen species (ROS). Excessive ROS production can lead to oxidative stress which may damage cellular components like lipids and proteins and causing photoaging. The use of natural photochemopreventive agents with antioxidant properties is an important alternative to improve the effectiveness of sunscreens and reduce skin photodamage. A crude extract (CE) from the leaves of Arrabidaea chica underwent partition by a liquid-liquid method...
November 17, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29156351/benzamide-porphyrins-with-directly-conjugated-and-distal-pyridyl-or-pyridinium-groups-substituted-to-the-porphyrin-macrocycles-study-of-the-photosensitising-abilities-as-inducers-of-apoptosis-in-cancer-cells-under-photodynamic-conditions
#2
Devashish Sengupta, Zeaul Hoque Mazumdar, Avinaba Mukherjee, Debdulal Sharma, Amit Kumar Halder, Samita Basu, Tarun Jha
Amphiphilic porphyrin photosensitisers (PSs) having combinations of directly substituted pyridyl group(s) at the meso-position of a porphyrin macrocycle, and/or indirectly linked pyridyl groups as benzamide derivatives are reported. The compounds 5,10,15,20-tetrakis-(4-pyridylbenzamide)porphyrin (A.2), 5,10,15,20-tetra[N-(pyridine-4-yl)benzamidium] porphyrin (A.3), 5-mono-(4-pyridyl)-10,15,20-tris-(4-pyridylbenzamide)porphyrin (B.2) and 5-mono-(4-methylpyridinium)-10,15,20-tris-(4-pyridiniumbenzamide)porphyrin (B...
November 13, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29156350/photodynamic-inactivation-of-escherichia-coli-correlation-of-singlet-oxygen-kinetics-and-phototoxicity
#3
Alexander Müller, Annegret Preuß, Beate Röder
Photodynamic inactivation (PDI) of bacteria may play a major role in facing the challenge of the ever expanding antibiotic resistances. Here we report about the direct correlation of singlet oxygen luminescence kinetics and phototoxicity in E. coli cell suspension under PDI using the widely applied cationic photosensitizer TMPyP. Through direct access to the microenvironment, the time resolved investigation of singlet oxygen luminescence plays a key role in understanding the photosensitization mechanism and inactivation pathway...
November 13, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29156347/creation-of-a-3mn-1fe-cluster-in-the-oxygen-evolving-complex-of-photosystem-ii-and-investigation-of-its-functional-activity
#4
B К Semin, L N Davletshina, M Seibert, A B Rubin
Extraction of Mn cations from the oxygen-evolving complex (OEC) of Ca-depleted PSII membranes (PSII[-Ca,4Mn]) by reductants like hydroquinone (H2Q) occurs with lower efficiency at acidic pH (2Mn/reaction center [RC] are extracted at pH5.7) than at neutral pH (3Mn/RC are extracted at pH6.5) [Semin et al. Photosynth. Res. 125 (2015) 95]. Fe(II) also extracts Mn cations from PSII(-Ca,4Mn), but only 2Mn/RC at pH6.5, forming a heteronuclear 2Mn/2Fe cluster [Semin and Seibert, J. Bioenerg. Biomembr. 48 (2016) 227]...
November 11, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29156349/biopolymer-gelatin-coated-zinc-oxide-nanoparticles-showed-high-antibacterial-antibiofilm-and-anti-angiogenic-activity
#5
Mani Divya, Baskaralingam Vaseeharan, Muthukumar Abinaya, Sekar Vijayakumar, Marimuthu Govindarajan, Naiyf S Alharbi, Shine Kadaikunnan, Jamal M Khaled, Giovanni Benelli
The use of natural polymers in drug design plays an important role in biomedical applications. Combinations of nanoparticles (NPs) and biopolymers have been shown to be useful for many purposes. This study focused on gelatin-coated zinc oxide NPs synthesized by co-precipitation. The particles were characterized by UV-Vis spectrum, showing a main peak at 375nm. The stability and crystalline nature of the particles was evaluated by Zeta potential and X-ray diffraction analysis. Fourier transform infrared spectroscopy (FTIR) revealed the possible functional groups of Ge-ZnO NPs, with strong bands at 3851, 3447, and 2923cm(-1)...
November 10, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29131990/non-thermal-near-infrared-exposure-photobiomodulates-cellular-responses-to-ionizing-radiation-in-human-full-thickness-skin-models
#6
Anke König, Nadja Zöller, Stefan Kippenberger, August Bernd, Roland Kaufmann, Paul G Layer, Anja Heselich
Ionizing and near-infrared radiation are both part of the therapeutic spectrum in cancer treatment. During cancer therapy ionizing radiation is typically used for non-invasive reduction of malignant tissue, while near-infrared photobiomodulation is utilized in palliative medical approaches, e.g. for pain reduction or impairment of wound healing. Furthermore, near-infrared is part of the solar wavelength spectrum. A combined exposure of these two irradiation qualities - either intentionally during medical treatment or unintentionally due to solar exposure - is therefore presumable for cancer patients...
November 10, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29131989/microwave-assisted-photocatalysis-of-neurotoxin-compounds-using-metal-oxides-quantum-dots-nanosheets-composites-photocorrosion-inhibition-reusability-and-antibacterial-activity-studies
#7
Ali Fakhri, Mona Azad, Leila Fatolahi, Shiva Tahami
Water pollution caused by different pollutants is one of the challenging tasks for the scientific community. We have prepared and characterized a material for removal of pollutant compounds. ZnO quantum dots decorated CuO nanosheets and TiO2 quantum dots decorated WO3 nanosheets composites have been prepared using a hydrothermal method. The as synthesized catalysts were characterized by various techniques. The crystallite sizes of CuO NSs and WO3 NSs were to be obtained 12.5 and 13.25nm and when dopped with ZnO and TiO2 size reduces to 3...
November 10, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29156348/development-of-photoprotective-antiphototoxic-and-antiphotogenotoxic-formulations-of-ocular-drugs-with-fluoroquinolones
#8
Anna Zgadzaj, Joanna Kornacka, Anita Jastrzębska, Andrzej Parzonko, Sylwester Sommer, Grzegorz Nałęcz-Jawecki
The development of innovative solutions in photosafety of photolabile pharmaceutical products may help to reduce the adverse effects of these products, caused by light exposure. Providing new data in this area of study is particularly important in case of drugs applied topically on sensitive organs such as eyes. The main goal of this research is to investigate whether two potential excipients, namely: p-coumaric acid and benzophenone-4, affect the photodegradation, phototoxicity and photogenotoxicity of water solutions of four fluoroquinolones: ciprofloxacin, lomefloxacin, fleroxacin and clinafloxacin...
November 9, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29161651/enhanced-anticancer-effect-of-fabricated-gallic-acid-cds-on-the-rgo-nanosheets-on-human-glomerular-mesangial-ip15-and-epithelial-proximal-hk2-kidney-cell-lines-cytotoxicity-investigations
#9
Wei Peng, Pengcheng Luo, Dingwen Gui, Weidong Jiang, Haixia Wu, Jie Zhang
In spite of the technological innovation in the biomedical science, cancer remains a critical disease. In this study, we designed a gallic acid/cadmium sulfide (GA/CdS) nanocomposite fabricated on the reduced graphene oxide (GA/CdS-rGO) nanosheets for the treatment system of human kidney cancer cells. The GA/CdS-rGO nanosheets have been prepared using gallic acid as a reducing agent. The characterization of nanocomposites was studied using UV-Vis spectroscope, FT-IR, XRD, SEM and TEM. The microscopic images showed the spherical shape and nano-scaled CdS nanoparticles on the sheet like rGO nanomaterials...
November 8, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29128706/consumption-of-ellagic-acid-and-dihydromyricetin-synergistically-protects-against-uv-b-induced-photoaging-possibly-by-activating-both-tgf-%C3%AE-1-and-wnt-signaling-pathways
#10
Na Rang Moon, Suna Kang, Sunmin Park
Ellagic acid (EGA) and dihydromyricetin (DHM) are both found in fruits and vegetables are used for anti-aging treatment for the skin. The anti-photoaging efficacy of EGA and DHM was investigated in UV-B irradiated skin in vivo and the involvement of transforming growth factor (TGF)-β1 and wnt signaling pathways were examined in vitro. HaCaT cells were treated with either 50μM EGA, 50μM DHM or 25μM EGA+25μM DHM before 100mJ/cm(2) UV-B exposure, and then oxidative stress and inflammation was measured. The involvement of TGF-β1 and wnt signaling was measured using their inhibitors, respectively, in HaCaT cells...
November 7, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29154198/evaluation-of-antioxidant-dna-targeting-antimicrobial-and-cytotoxic-studies-of-imine-capped-copper-and-nickel-nanoparticles
#11
P Adwin Jose, J Dhaveethu Raja, M Sankarganesh, J Rajesh
In this work, we have synthesized pyrimidine derivatives of Schiff base ligand 2-(4,6-dimethoxypyrimidin-2-ylimino)methyl)-6-methoxyphenol (DPMM) stabilized copper nanoparticles (DPMM-CuNPs) and nickel nanoparticles (DPMM-NiNPs) by modified Brust-Schiffrin technique as two step phase transfer assisted method and confirmed by UV-Visible, SEM and TEM analysis. The free radical scavenging activity of DPMM, DPMM-CuNPs &DPMM-NiNPs with 2, 2'-diphenylpicryl hydrazyl (DPPH), hydrogen peroxide (H2O2) super oxide dismutase (SOD) and nitric oxide (NO) shows that the antioxidant activity of DPMM-CuNPs is higher than DPMM &DPMM-NiNPs...
November 6, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29136522/ternary-composite-of-tio2-nanotubes-ti-plates-modified-by-g-c3n4-and-sno2-with-enhanced-photocatalytic-activity-for-enhancing-antibacterial-and-photocatalytic-activity
#12
Masoud Faraji, Neda Mohaghegh, Amir Abedini
A series of g-C3N4-SnO2/TiO2 nanotubes/Ti plates were fabricated via simple dipping of TiO2 nanotubes/Ti in a solution containing SnCl2 and g-C3N4 nanosheets and finally annealing of the plates. Synthesized plates were characterized by various techniques. The SEM analysis revealed that the g-C3N4-SnO2 nanosheets with high physical stability have been successfully deposited onto the surface of TiO2 nanotubes/Ti plate. Photocatalytic activity was investigated using two probe chemical reactions: oxidative decomposition of acetic acid and oxidation of 2-propanol under irradiation...
November 6, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29149689/an-extended-sequence-specificity-for-uv-induced-dna-damage
#13
Long H Chung, Vincent Murray
The sequence specificity of UV-induced DNA damage was determined with a higher precision and accuracy than previously reported. UV light induces two major damage adducts: cyclobutane pyrimidine dimers (CPDs) and pyrimidine(6-4)pyrimidone photoproducts (6-4PPs). Employing capillary electrophoresis with laser-induced fluorescence and taking advantages of the distinct properties of the CPDs and 6-4PPs, we studied the sequence specificity of UV-induced DNA damage in a purified DNA sequence using two approaches: end-labelling and a polymerase stop/linear amplification assay...
November 2, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29128705/1-3-di-n-butylimidazolium-tribromide-bbim-br3-an-efficient-recyclable-catalyst-mediated-synthesis-of-n-substituted-azepines-and-their-biological-evaluation-interaction-study-with-human-serum-albumin
#14
Swetha K Maddili, Rakhi Chowrasia, Vijaya Kumar Kannekanti, Himabindu Gandham
A majority of previously reported methods suffer from insufficient yields as well as more complicated experimental procedures, a smaller amount of isolated yields involving time-consuming and tiresome work-up with the use of metal catalyst and restricted scope of substrates. To overcome these issues, an environmentally benign, ionic liquid endorsed multi-component protocol to N-substituted azepines has been exploited by means of coupling aromatic amines, dimethyl/diethyl acetylene dicarboxylate, 2,5-dimethoxytetrahydrofuran using 1,3-Di-n-butylimidazolium tribromide [BBim]Br3...
November 2, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29101869/mesoporous-silica-for-drug-delivery-interactions-with-model-fluorescent-lipid-vesicles-and-live-cells
#15
Munmun Bardhan, Anupa Majumdar, Sayantan Jana, Tapas Ghosh, Uttam Pal, Snehasikta Swarnakar, Dulal Senapati
Formulated mesoporous silica nanoparticle (MSN) systems offer the best possible drug delivery system through the release of drug molecules from the accessible pores. In the present investigation, steady state and time resolved fluorescence techniques along with the fluorescence imaging were applied to investigate the interactions of dye loaded MSN with fluorescent unilamellar vesicles and live cells. Here 1,2-dimyristoyl-sn-glycero-3-phospocholine (DMPC) was used to prepare Small Unilamellar Vesicles (SUVs) as the model membrane with fluorescent 1,6-diphenyl-1,3,5-hexatriene (DPH) molecule incorporated inside the lipid bilayer...
November 1, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29101867/synthesis-dna-binding-and-cytotoxic-activity-of-pyrimido-4-5-4-5-thieno-2-3-b-quinoline-with-9-hydroxy-4-3-diethylaminopropylamino-and-8-methoxy-4-3-diethylaminopropylamino-substitutions
#16
Hulihalli N KiranKumar, Heggodu G RohitKumar, Gopal M Advirao
Two new derivatives of pyrimido[4',5';4,5]thieno(2,3-b)quinoline (PTQ), 9-hydroxy-4-(3-diethylaminopropylamino)pyrimido[4',5';4,5]thieno(2,3-b)quinoline (Hydroxy-DPTQ) and 8-methoxy-4-(3-diethylaminopropylamino)pyrimido[4',5';4,5]thieno(2,3-b)quinoline (Methoxy-DPTQ) were synthesized and their DNA binding ability was analyzed using spectroscopy (UV-visible, fluorescence and circular dichroism), ethidium bromide dye displacement assay, melting temperature (Tm) analysis and computational docking studies. The hypochromism in UV-visible spectrum and increased fluorescence emission of Hydroxy-DPTQ and Methoxy-DPTQ in the presence of DNA suggested the molecule-DNA interaction...
November 1, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29154200/uvr-and-par-absorbing-compounds-of-marine-brown-macroalgae-along-a-latitudinal-gradient-of-the-brazilian-coast
#17
Caroline Schmitz, Fernanda Ramlov, Leidson Allan Ferreira de Lucena, Virgilio Uarrota, Manuela Bernardes Batista, Marina Nasri Sissini, Iara Oliveira, Bruno Briani, Cintia D L Martins, José Marcos de Castro Nunes, Leonardo Rörig, Paulo Antunes Horta, Félix L Figueroa, Nathalie Korbee, Marcelo Maraschin, José Bonomi-Barufi
Absorption spectra are indicative of biological sample chemical composition and can be used as a basis for the construction of descriptive and predictive models for biotechnological screening or assays. In marine algae, chemical composition can vary due to species-specific differences in biochemistry, as well as intra-specific responses to unique environmental variables. Different indices (UVCi, UVB+Ai and PARi) were proposed and calculated to evaluate how photoprotective compounds vary in 18 species of Phaeophyceae...
October 31, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29161650/how-the-morphological-properties-of-mentha-longifolia-l-huds-may-be-affected-by-geographical-differences
#18
Mohammad Mohammadi, Hossein Ali Asadi-Gharneh
With respect to the benefits of medicinal plants for human health and their use as food, they are extensively being researched and planted in different parts of the world including Iran. Among the most important parameters, which may affect the growth and the yield of medicinal plants is their geographical (ecotype) properties. Accordingly, a research work was proposed to investigate the effects of 10 different regions or ecotypes on the morphological properties of pennyroyal [Mentha longifolia. (L.) Huds.] from the Lamiaceae family in one of the Iranian provinces, namely Ilam...
October 28, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29156346/abcg2-mediated-suppression-of-chlorin-e6-accumulation-and-photodynamic-therapy-efficiency-in-glioblastoma-cell-lines-can-be-reversed-by-ko143
#19
Sara A Abdel Gaber, Patricia Müller, Wolfgang Zimmermann, Dirk Hüttenberger, Rainer Wittig, Mahmoud H Abdel Kader, Herbert Stepp
BACKGROUND: Photodynamic therapy (PDT) of malignant brain tumors is a promising adjunct to standard treatment, especially if tumor stem cells thought to be responsible for tumor progression and therapy resistance were also susceptible to this kind of treatment. However, some photosensitizers have been reported to be substrates of ABCG2, one of the membrane transporters mediating resistance to chemotherapy. Here we investigate, whether inhibition of ABCG2 can restore sensitivity to photosensitizer chlorin e6-mediated PDT...
October 28, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29125985/cadmium-toxicity-and-its-amelioration-by-kinetin-in-tomato-seedlings-vis-%C3%A3-vis-ascorbate-glutathione-cycle
#20
Shikha Singh, Anita Singh, Prabhat Kumar Srivastava, Sheo Mohan Prasad
The supplementation of plant hormones may enhance the tolerance capacity of plants against certain environmental stresses by increasing their physiological functioning and detoxification capacity. To answer the question that whether a phytohormone 'kinetin' (KN, 6-furfuylaminopurine), one of the artificial cytokinins could ameliorate the cadmium induced toxicity in tomato seedlings, the effect of KN was assessed in differentially cadmium (Cd1: 3mgkg(-1) sand and Cd2: 9mgkg(-1) sand) intoxicated tomato seedlings by estimating the changes in reactive oxygen species (ROS, viz...
October 28, 2017: Journal of Photochemistry and Photobiology. B, Biology
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