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Journal of Photochemistry and Photobiology. B, Biology

Mariana Maciel de Oliveira, Regina Gomes Daré, Érica Oliveira Barizão, Jesuí Vergílio Visentainer, Mariza Barion Romagnolo, Celso Vataru Nakamura, Maria da Conceição Torrado Truiti
The total phenolic content (TP) and antioxidant activity of the ethanolic extract and fractions that were obtained from the leaves of Nectandra hihua were assessed using different methods. The ethanolic extract (EE) and ethyl acetate fraction (EAF) had the best antioxidant capacity, which was comparable to butylated hydroxytoluene and quercetin (ABTS+ 2.55 ± 0.06, 3.54 ± 0.03 mmol TE/g; DPPH IC50 10.27 ± 0.05, 9.88 ± 0.02 μg/mL; FRAP 2.17 ± 0.08, 2.38 ± 0.04 mmol TE/g; ORAC 5...
March 9, 2018: Journal of Photochemistry and Photobiology. B, Biology
Pedro Jorge Louro Crugeira, Gustavo M Pires-Santos, Susana C P S de Oliveira, Fernando José Pires Sampaio, Neandder Andrade Correia, Sandra R C de A Fagnani, Fabio Alexandre Chinalia, Paulo Fernando de Almeida, Antônio L B Pinheiro
Cellulose has a highly diversified architecture and its enzymatic complexes are studied for achieving an efficient conversion and a high level of efficiency in the deconstruction of cellulolytic biomass into sugars. The aim of this investigation was to evaluate the effect of Laser or LED light in the cellulolytic activity (CMCase) and on the proliferation of the thermophilic microbial consortium used on the degradation process of a lignocellulosic biomass of green coconut shell. The irradiation protocol consisted of six Laser irradiations (λ660 ηm, 40 mW, 270 s, 13 J/cm2 ) or LED (λ632 ± 2 ηm, 145 mW, 44 s, 13 J/cm2 ) with 12- h time intervals in nutrient deprivation conditions...
March 8, 2018: Journal of Photochemistry and Photobiology. B, Biology
Xiaohong Zhang, Can Xiao
Ablation treatments are the minimally invasive surgical procedures that are used to treat early stage cancers. High intensity ultrasonic treatments that are used to treat solid cancers are not much successful in differentiating between healthy and cancerous cells. In this study, a method of combining ultrasound treatment with Garcinia mangostana bark extract mediated silver nanoparticles (AgNPs) was extended by making use of human lung epithelial cells, that could preferentially destruct the cancerous cells...
March 6, 2018: Journal of Photochemistry and Photobiology. B, Biology
Karim Chouchane, Isabelle Pignot-Paintrand, Franz Bruckert, Marianne Weidenhaupt
Insulin is known to form amyloid aggregates when agitated in a hydrophobic container. Amyloid aggregation is routinely measured by the fluorescence of the conformational dye thioflavin T, which, when incorporated into amyloid fibers, fluoresces at 480 nm. The kinetics of amyloid aggregation in general is characterized by an initial lag-phase, during which aggregative nuclei form on the hydrophobic surface. These nuclei then lead to the formation of fibrils presenting a rapid growth during the elongation phase...
March 6, 2018: Journal of Photochemistry and Photobiology. B, Biology
Antonio Di Martino, Marina E Trusova, Pavel S Postnikov, Vladimir Sedlarik
An innovative microcarrier based on a carboxy-enriched and branched polylactic acid derivative was developed to enhance the in vitro phototoxicity of the photosensitizer and prodrug 5-aminolevulinic. Microparticles, prepared by double emulsion technique and loaded with the prodrug were carefully characterized and the effect of the polymer structure on the chemical, physical and biological properties of the final product was evaluated. Results showed that microparticles have a spherical shape and ability to allocate up to 30 μg of the photosensitizer per mg of carrier despite their difference in solubility...
March 3, 2018: Journal of Photochemistry and Photobiology. B, Biology
Hamid Reza Rajabi, Fatemeh Karimi, Hossein Kazemdehdashti, Leila Kavoshi
In this research, a sono-assisted chemical precipitation method was developed for a quick and efficient water-based synthesis of zinc sulfide (ZnS) quantum dots (QDs), in room temperature. ZnS QDs as pure and doped with some transition metal ions (such as Cu2+ , Mn2+ , Ag+ ) were prepared in the presence of l-cysteine, as capping agent. In comparison with the previous conventional methods, applying the ultrasonic irradiation provides a significant decrease in the reaction time. In comparison with previous reported conventional chemical QD synthesis methods, the required time for a complete synthesis in the presence of ultrasonic irradiations was significantly reduced to a period as short as 15 min, in a temperature of 40 °C...
February 22, 2018: Journal of Photochemistry and Photobiology. B, Biology
Hifza Jabeen, Samia Saleemi, Humaira Razzaq, Azra Yaqub, Saira Shakoor, Rumana Qureshi
Reactive oxygen (hydroxyl OH, hydroperoxyl OOH) species are highly unstable to be studied experimentally under normal conditions. The present study reports the antioxidant potential of the vitamins namely ascorbic acid, riboflavin and nicotinic acid against these reactive oxygen species (ROS) using the predictive power of Density Functional Theory (DFT) (B3LYP with 6311G basis set) calculations. The order of reactivity of aforementioned vitamins was assessed by determining the bond dissociation enthalpy (BDE) of the OH bond, which is the controlling factor, if hydrogen atom transfer (HAT) mechanism is considered...
February 22, 2018: Journal of Photochemistry and Photobiology. B, Biology
Hongru Ma, Jianfeng Han, Qinchuan Dong
The present study aimed to investigate the neuroprotective effect of Annona glabra extract (AGE) against ethanol-induced neurodegeneration in neonatal rats. AGE is known to contain various pharmacological and therapeutic properties. Phytochemical analysis of AGE was performed to understand the presence of vital therapeutic components. Neonatal rats were assigned to the following groups: group I (normal control rats receiving normal saline), group II (control rats receiving ethanol), and group III (treated rats receiving ethanol-AGE)...
February 21, 2018: Journal of Photochemistry and Photobiology. B, Biology
Tahir Rasheed, Muhammad Bilal, Chuanlong Li, Faran Nabeel, Muhammad Khalid, Hafiz M N Iqbal
Herein, we reported a facile, green and environmental friendlier biosynthesis of silver nanoparticles using the Convolvulus arvensis extract. The influences of various physicochemical factors such as the concentration of the plant extract, reaction time, and different pH levels were investigated by UV-Vis spectroscopy. The UV-Visible absorption spectrum of biogenic silver nanoparticles at λmax around ~400 nm suggested the biosynthesis of silver nanoparticles. Fourier transform infrared spectroscopy was employed to confirm the chemical transformation and role of various phyto-reductants in the conversion of Ag+ to Ag0 ...
February 21, 2018: Journal of Photochemistry and Photobiology. B, Biology
Tomáš Zavřel, Milán Szabó, Bojan Tamburic, Christian Evenhuis, Unnikrishnan Kuzhiumparambil, Petra Literáková, Anthony W D Larkum, John A Raven, Jan Červený, Peter J Ralph
This study describes the impacts of inorganic carbon limitation on the photosynthetic efficiency and operation of photosynthetic electron transport pathways in the biofuel-candidate microalga Nannochloropsis oculata. Using a combination of highly-controlled cultivation setup (photobioreactor), variable chlorophyll a fluorescence and transient spectroscopy methods (electrochromic shift (ECS) and P700 redox kinetics), we showed that net photosynthesis and effective quantum yield of Photosystem II (PSII) decreased in N...
February 21, 2018: Journal of Photochemistry and Photobiology. B, Biology
Hasan Soleimani, Abdollah Amini, Soudabeh Taheri, Ensieh Sajadi, Sasha Shafikhani, Lucia A Schuger, Vijaya B Reddy, Seyed Kamran Ghoreishi, Ramin Pouriran, Sufan Chien, Mohammad Bayat
The purpose of the present scientific study was to analyze the effects of combined pulsed wave Photobiomodulation (PW PBM) and Curcumin on the microbial flora; in addition, the tensiometrical wounds properties for type one diabetes mellitus (TIDM) in an experimental animal model. TIDM induction was performed in thirty rats. In the entire animals, one full-thickness excision was implemented on their backs. Randomly, the divisions of rats into 5 groups took place. The primary group was considered as the control group and did not receive any treatment...
February 21, 2018: Journal of Photochemistry and Photobiology. B, Biology
Dorota Chełminiak-Dudkiewicz, Marta Ziegler-Borowska, Magdalena Stolarska, Lukasz Sobotta, Michal Falkowski, Jadwiga Mielcarek, Tomasz Goslinski, Jolanta Kowalonek, Katarzyna Węgrzynowska-Drzymalska, Halina Kaczmarek
Three magnesium sulfanyl porphyrazines differing in the size of peripheral substituents (3,5-dimethoxybenzylsulfanyl, (3,5-dimethoxybenzyloxy)benzylsulfanyl, 3,5-bis[(3,5-bis[(3,5-dimethoxybenzyloxy)benzyloxy]benzylsulfanyl) were exposed to visible and ultraviolet radiation (UV A + B + C) in order to determine their photochemical properties. The course of photochemical reactions in dimethylformamide solutions and the ability of the systems to generate singlet oxygen were studied by UV-Vis spectroscopy, which additionally gave information on aggregation processes...
February 21, 2018: Journal of Photochemistry and Photobiology. B, Biology
Sami A Alyahya, Marimuthu Govindarajan, Naiyf S Alharbi, Shine Kadaikunnan, Jamal M Khaled, Ramzi A Mothana, Mohammed N Al-Anbr, Baskaralingam Vaseeharan, Ramachandran Ishwarya, Mariappan Yazhiniprabha, Giovanni Benelli
Recent research in entomology and parasitology focused on the efficacy of green fabricated nanomaterials as novel insecticides. In this study, we synthesized poly-dispersed and stable silver nanoparticles (AgNPs) using the leaf extract of Holostemma ada-kodien. The nanostructures were characterized by ultraviolet-visible spectroscopy, Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray, and X-ray diffraction analysis. The efficacy of H...
February 17, 2018: Journal of Photochemistry and Photobiology. B, Biology
Zaheer Khan, Shaeel Ahmad Al-Thabaiti
Biomimetic method was used for the synthesis of Fe-nanoparticles (FeNPs). FeCl3 and Hibiscus sabdariffa, Roselle flower aqueous extract (HBS) were employed in the present studies. The FeNPs have been characterized by using UV-visible spectroscopy, transmission electron microscope (TEM), and energy dispersion X-ray spectroscopy (EDS). The average particles diameter was found to be 18 nm. The as prepared FeNPs were used as a catalyst to the oxidative degradation of rhodamine B (RB) in presence of NaBH4 . The effects of various quencher on the degradation rates were examined by employing ammonium oxalate (AO), benzoquinone (BQ), isopropyl alcohol (IPA), and potassium iodide (KI)...
February 16, 2018: Journal of Photochemistry and Photobiology. B, Biology
Mingcui Zhai, Yichen Xu, Biao Zhou, Weibin Jing
In the Present-day medicinally applied wound bandages have many drawbacks for, instance, rigidity, non-porosity, low mechanical potency, also an affinity for bandages to stick onto the injury exterior; additionally, a greater part of the bandages did not secure bactericidal activity. Hydrogel derived injury bandages would be supportive to afford a chill feeling with a humidity atmosphere, in addition, to performing as an obstruction to bacteria. To overcome these drawbacks, we have fabricated porous keratin-chitosan/n-ZnO nanocomposite (KCBZNs) bandages via the inclusion of nano-ZnO into the keratin-chitosan hydrogel...
February 16, 2018: Journal of Photochemistry and Photobiology. B, Biology
D Arumai Selvan, D Mahendiran, R Senthil Kumar, A Kalilur Rahiman
Phyto-synthesis of silver nanoparticles (AgNPs) was achieved using aqueous garlic, green tea and turmeric extracts, and characterized by different spectroscopic techniques. Phytochemical analysis revealed the presence of rich amount of biochemicals in these extracts, which serve as reducing and capping agents for converting silver nitrate into AgNPs. FT IR spectroscopy confirmed the role of biomolecules in the bioreduction and efficient stabilization of AgNPs. UV-Vis DRS spectra showed a band around 450 nm characteristics of AgNPs...
February 14, 2018: Journal of Photochemistry and Photobiology. B, Biology
Thangavel Thirunavukkarasu, Hazel A Sparkes, C Balachandran, S Awale, Karuppannan Natarajan, V G Gnanasoundari
A novel one-dimensional coordination polymer containing Cu(I)Cu(II) core with chloro bridge on Cu(I) and ligand bridge on Cu(II) ions (1) and a mononuclear Cu(II) complex (2) have been synthesized from the reactions of 3- and 4-methoxy-3-quinolin-3-ylimino-methyl-2-phenol with [CuCl2 (PPh3 )2 ]. The ligands and the complexes have been characterized by spectral and analytical methods. In addition, the structures of both the ligands and the copper complexes were confirmed by single crystal X-ray diffraction studies...
February 13, 2018: Journal of Photochemistry and Photobiology. B, Biology
Zia Ul Haq Khan, Amjad Khan, Young Mei Chen, Noor S Shah, Arif Ullah Khan, Nawshad Muhammad, Kamran Tahir, Hidayat Ullah Shah, Zia Ullah Khan, Muhammad Shakeel, Muhammad Nadeem, Muhammad Imran, Pingyu Wan
The drug resistant bacteria and textile contaminations of water cause different sever health problem throughout the world. To overcome this issue, new environmental benign materials and methods are needed. Plant metabolites directed synthesis of nanoparticles is considered eco-friendly and easy in synthesis. Therefore, it was explicit for the synthesis of AgNPs. The prepared AgNPs were evaluated for antibacterial, antioxidant, photo-catalytic and electrochemical degradation properties as well as toxicity of degradation products on aquatic life...
February 13, 2018: Journal of Photochemistry and Photobiology. B, Biology
Al Thabiani Aziz, Mohammed Ali Alshehri, Chellasamy Panneerselvam, Kadarkarai Murugan, Subrata Trivedi, Jazem A Mahyoub, Mo'awia Mukhtar Hassan, Filippo Maggi, Stefania Sut, Stefano Dall'Acqua, Angelo Canale, Giovanni Benelli
The development of eco-friendly and effective insecticides is crucial for public health worldwide. Herein, we focused on the desert wormwood (Artemisia herba-alba), a plant widely used in Arabian traditional medicine, as a source of green nanoinsecticides against mosquito vectors, as well as growth inhibitors to be employed against microbial pathogens. Ag nanoparticles (AgNPs) fabricated with the A. herba-alba extract were tested on Indian and Saudi Arabian strains of Anopheles, Aedes and Culex mosquitoes. The chemical profile of the A...
February 11, 2018: Journal of Photochemistry and Photobiology. B, Biology
Larissa Alexsandra da Silva Neto Trajano, Luiz Philippe da Silva Sergio, Ana Carolina Stumbo, Andre Luiz Mencalha, Adenilson de Souza da Fonseca
Exposure of cells to genotoxic agents causes modifications in DNA, resulting to alterations in the genome. To reduce genomic instability, cells have DNA damage responses in which DNA repair proteins remove these lesions. Excessive free radicals cause DNA damages, repaired by base excision repair and nucleotide excision repair pathways. When non-oxidative lesions occur, genomic stability is maintained through checkpoints in which the cell cycle stops and DNA repair occurs. Telomere shortening is related to the development of various diseases, such as cancer...
February 10, 2018: Journal of Photochemistry and Photobiology. B, Biology
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