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Journal of Photochemistry and Photobiology. B, Biology

Li-Fang Hsu, Meng-Huan Tsai, Bei-En Chang, Yi-Jane Chen, Chung-Chen Jane Yao
OBJECTIVE: During orthodontic tooth movement (OTM), the speed of movement depends on the rate of bone turnover. In this study, we used a rat model to investigate the effect of 970 nm low-level laser therapy (LLLT) on OTM under different dose and frequency protocols. METHODS: We first compared the OTM rates between the OTM only control and the OTM + LLLT group (1250 J/cm2 ) in Experiment 1 and showed that LLLT significantly increased OTM. In Experiment 2, we employed 3 different LLLT protocols: the low-dose group and the high-dose group receiving 5 doses of 750 J/cm2 and 15,000 J/cm2 of LLLT every 3 days, respectively, and the early high-dose group which received 5 daily doses at 15,000 J/cm2 at the beginning of the experiments...
July 10, 2018: Journal of Photochemistry and Photobiology. B, Biology
Hanan A El-Bakry, Ismail Ahmed Ismail, Safaa S Soliman
The awareness of the interrelationship between immunosenescence and constant light exposure can provide new insights into the consequences of excessive exposure to light at night due to light pollution or shift work. Here, we investigated whether constant light exposure (LL) acts as an inducer of immunosenescence. We also determined the role of melatonin or turmeric in reversing the putative effects of constant light and explored for the first time the underlying molecular mechanisms. Young (3-4-month-old) rats were exposed daily to LL alone or in combination with each of melatonin and turmeric for 12 weeks...
July 9, 2018: Journal of Photochemistry and Photobiology. B, Biology
Debjani Baruah, Monmi Goswami, Raj Narayan Singh Yadav, Archana Yadav, Archana Moni Das
Plants and their extracts play an important role in the green synthesis of nanoparticles mainly because of their environmental benignity. Based on plant extracts number of metal nanoparticles have been synthesized. In our study, we report a green technique for the synthesis of gold nanoparticles using the aqueous extracts of Alpinia nigra leaves and their photocatalytic activities. The antioxidant, antibacterial and antifungal potential of the synthesized nanoparticles were also evaluated. The aqueous extract of the plant is rich in flavonoids with Total Flavonoid Content of 491mgRE/g extract...
July 7, 2018: Journal of Photochemistry and Photobiology. B, Biology
George E Davis, Walter E Lowell
PURPOSE: The purpose of this paper is to examine the role of UVR at birth and its relationship to lifespan and determine whether there are significant differential effects on sex and race. We test if variation in UVR, as determined by solar cycles (long-term variation), is related to survival as measured by age at death. METHODS: The data used 78 million death records from the National Center for Health Statistics (NCHS) from 1979 to 2013 with accidents, suicides, and war casualties deleted resulted in ~63 million records...
July 5, 2018: Journal of Photochemistry and Photobiology. B, Biology
Sudarat Yenjai, Challa V Kumar, Mayuso Kuno, Teerayuth Liwporncharoenvong, Siritron Samosorn, Apinya Buranaprapuk
Rational design of photoreagents with systematic modifications of their structures can provide valuable information for a better understanding of the protein photocleavage mechanism by these reagents. Variation of the length of the linker connecting the photoactive moiety with the protein anchoring-group allowed us to investigate the control of the protein photocleavage site. A series of new photochemical reagents (PMA-1A, PMA-2A and PMA-3A) with increasing chain lengths is examined in the current study. Using avidin as a model system, we examined the interaction of these probes by UV-Vis, fluorescence spectroscopic methods, photocleavage and computational docking studies...
July 2, 2018: Journal of Photochemistry and Photobiology. B, Biology
Sara Dadras, Mohammad-Amin Abdollahifar, Hamid Nazarian, Seyed Kamran Ghoreishi, Somaye Fallahnezhad, Parvaneh Naserzadeh, Vahid Jajarmi, Sufan Chien, Mohammad Bayat
The aim of this study was to evaluate the effect of photobiomodulation (PBM) on testicular tissues and fresh sperm analysis factors in streptozotocin (STZ)-induced type one diabetes mellitus (T1DM) mice. T1DM was induced in 15 male Syrian mice by injection of 200 mg/kg STZ. After one month, mice were divided randomly into three groups, harboring 5 mice each: 1, control group; 2, first laser group (890 nm, 80 Hz, 0.03 J/cm2 ) and 3, second laser group (0.2 J/cm2 ). Then the mice were euthanized and testicles were dissected for stereological studies, and both epididymis and vas deferens were removed for fresh sperm analysis...
June 30, 2018: Journal of Photochemistry and Photobiology. B, Biology
Sefadzi Tay-Agbozo, Shane Street, Lowell Kispert
The electrochemical oxidation potentials of cis bixin correspond to the production of the carotenoid radical cation, Car+ and dication Car++ . The oxidation is a two-electron process with oxidation potentials at ~0.94 and ~1.14 V vs SCE (reference to ferrocene at 0.528 V) in THF. These potentials are higher than that of symmetrical canthaxanthin at 0.775 V and 0.972 V and for β-carotene at 0.634 V and 0.605 V respectively. The second oxidation potential for canthaxanthin is higher by 0.20 V than the first...
June 30, 2018: Journal of Photochemistry and Photobiology. B, Biology
Sangeeta Mahableshwar Naik, Arga Chandrashekar Anil
In the photic zone, phytoplankton experience diurnal variation in light intensity. However, prolonged exposure to aphotic condition influences their physiological state. Pigment composition is a useful biomarker to decipher cells physiological state and adaptive response to changing environmental conditions. Chlorophyll, a natural pigment, is biosynthesised even in darkness and studies have shown this ability is determined by genetic characteristics of an organism. The purpose of this study was to examine the influence of darkness on pigments and chlorophyll autofluorescence of Tetraselmis indica...
June 28, 2018: Journal of Photochemistry and Photobiology. B, Biology
Vijisha K Rajan, T K Shameera Ahamed, K Muraleedharan
A computational analysis of UV filtering and radical scavenging capacity of a flavanone, Eriodictyol has been performed under DFT-B3LYP/6-31+ G (d, p). Eriodictyol is nontoxic and nonirritant bitter masker commonly used in the wine industry. It has been reported that the flavanones were widely acceptable for photoprotection due to its potential UV filtering and radical scavenging capacity. This study provides theoretical evidence that the eriodictyol has an absorbance in the UV-A and UV-B region of the electromagnetic spectrum and therefore can be used as a potential UV filter in sunscreen lotions and other cosmetic products...
June 28, 2018: Journal of Photochemistry and Photobiology. B, Biology
Jing Wang, Xia Yang, Hu Song, Wei Liao, Liangang Zhuo, Guanquan Wang, Hongyuan Wei, Yuchuan Yang, Shunzhong Luo, Zhijun Zhou
Positive charged porphyrins have long been regarded as effective biocidal agents, however neutral porphyrins have rarely been studied in their ability photoinactivating microbials, and the structure-activity relationship such as correlation of electronic effect and biocidal activity of porphyrins still remains unclear. Herein, four neutral porphyrins with various electronic effects were selected to undergo light-induced biocidal processes. It turned out that the TPPOH and TPPNH2 with electron-donating groups NH2 and OH, respectively, exhibited much more powerful light-induced biocidal activities against E...
June 26, 2018: Journal of Photochemistry and Photobiology. B, Biology
Ryo Shimokawa, Masafumi Ueda, Kouta Sugikawa, Atsushi Ikeda
In a drug-delivery system using liposomes, the use of guest molecules bearing hydrophilic moieties results in some leakage from lipid membranes. We suppressed the leakage of coumarins (used as model guest molecules in a drug-delivery system) from lipid membranes by photodimerization at 365 nm. The reason for this phenomenon could be ascribed to an increase in the hydrophobicity of the dimers of the coumarins. The formation of the dimers was detected by 1 H NMR, UV-vis absorption, and mass spectra and the leakage percentages of the coumarins were determined by 1 H NMR spectra based on the peak intensities...
June 23, 2018: Journal of Photochemistry and Photobiology. B, Biology
Zahra Naderi, Javad Azizian
This paper presents the preparation of hydrogel with magnetic properties derived from carboxymethyl chitosan for controlled drug release performance. The magnetic Fe3 O4 and MnFe2 O4 nanoparticles with crosslinked Carboxymethyl Chitosan hydrogel were prepared by using epichlorohydrin as the cross-linker. The structure characterization performed by FT-IR. The XRD analysis was applied for evaluation of crystalline phase of MnFe2 O4 and Fe3 O4 in the hydrogels. The crystallite size of Fe3 O4 /CMCS and MnFe2 O4 /CMCS was calculated to be 30...
June 23, 2018: Journal of Photochemistry and Photobiology. B, Biology
Wei Gao, Yu-Shuai Wang, Eunson Hwang, Pei Lin, Jahyun Bae, Seul A Seo, Zhengfei Yan, Tae-Hoo Yi
Chronic exposure to ultraviolet (UV) radiation causes photo-oxidation, which in turn results in the upregulation of matrix metalloproteinases (MMPs) and loss of collagen. Rubus idaeus L. (RI), also called red raspberry, is an important cash crop that contains abundant antioxidant compounds. Sanguiin H-6 and lambertianin C are the major ingredients presented in the extracts. Here, we studied the protective effect of RI on UVB-induced photoaging in normal human dermal fibroblasts (NHDFs). We found that RI notably reduced UVB-induced MMPs secretion and pro-inflammatory mediators production, and significantly suppressed UVB-induced activation of mitogen-activated protein kinase (MAPK), nuclear factor-κβ, as well as activator protein 1...
June 22, 2018: Journal of Photochemistry and Photobiology. B, Biology
Letícia Parada Moreira, Landulfo Silveira, Marcos Tadeu Tavares Pacheco, Alexandre Galvão da Silva, Debora Dias Ferraretto Moura Rocco
Raman spectroscopy (RS) is a vibrational technique that is suitable for performing biochemical analyses in human tissues and fluids. This work has investigated the identification of biochemical markers due to physical performance in the urine of swimming athletes. This was achieved by means of the Raman features that were found before and after the swimming training compared to the sedentary control subjects. These particular biochemical marker identifications refer to and infer the physiological status of individuals...
June 22, 2018: Journal of Photochemistry and Photobiology. B, Biology
Asmaa I Nabeel, Fatma S M Moawed, Heba Hassan
No abstract text is available yet for this article.
June 22, 2018: Journal of Photochemistry and Photobiology. B, Biology
Azar Ullah Mirza, Abdul Kareem, Shahab A A Nami, Mohd Shoeb Khan, Sumbul Rehman, Shahnawaz Ahmad Bhat, Abdulrahman Mohammad, Nahid Nishat
A phytoextract mediated synthesis of iron oxide nanoparticles using Agrewia optiva (Dhaman or Biul) and Prunus persica (Peach) leaf extract as capping and stabilizing agent without using hazardous toxic chemicals via biogenic route has been studied. The biogenic method of synthesis is convenient, rapid, cost effective and ecofriendly. The green synthesized nanoparticles were characterized by Ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, Attenuated total reflectance spectroscopy, X-ray diffraction analysis, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy and dynamic light scattering measurements...
June 21, 2018: Journal of Photochemistry and Photobiology. B, Biology
Shaorong Luan, Solange Muhayimana, Jiuyong Xu, Xianfei Zhang, Ciying Xiao, Qingchun Huang
Photosensitization of V79 Chinese hamster lung fibroblasts was tested to investigate if the cells can fit the photoactive effect of alpha-terthienyl for safety application. Using 15-min photoirradiation of a black light (320-400 nm, 40 W), alpha-terthienyl was significantly photoactivated and caused V79 cells to be shrinkage, detachment and necrosis. The photoactivated alpha-terthienyl played a concentration-dependent stress to decrease cell survival and to induce cell death with median inhibitory concentration (IC50 ) as 4...
June 21, 2018: Journal of Photochemistry and Photobiology. B, Biology
Roberta Ascrizzi, Daniele Fraternale, Guido Flamini
The effect of different wavelengths on plants morphological characters has been widely described, but also the chemical composition of the essential oil is influenced by the lighting conditions in which they are grown. In the present study, the effect of both the enrichment (reverse Emerson effect) and the monochromatic lighting treatments with red light has been evaluated on the essential oil compositions of parsley (Petroselinum crispum (Mill.) Fuss). Multivariate statistical analysis was performed on the results, with both the hierarchical cluster and principal component analyses...
June 21, 2018: Journal of Photochemistry and Photobiology. B, Biology
Gabriella Emri, György Paragh, Ágnes Tósaki, Eszter Janka, Sándor Kollár, Csaba Hegedűs, Emese Gellén, Irén Horkay, Gábor Koncz, Éva Remenyik
Ultraviolet (UV) light is absorbed by nucleic acids, proteins or other endogenous chromophores, such as porphyrins, flavins and melanin, triggering biological processes in skin cells. Both UV-induced mutations in melanocytes and changes in the immune microenvironment are understood to play a role in the development of cutaneous melanoma. The degree of UV-induced stress and the protection against this stress are influenced by both intracellular and intercellular molecular interactions. The present review summarizes the known major molecular biological changes induced by UV light in the skin that play a role in melanoma initiation and promotion...
June 14, 2018: Journal of Photochemistry and Photobiology. B, Biology
Tariq Khan, Bilal Haider Abbasi, Mubarak Ali Khan
Manipulation in the light regimes combined with the effects of plant growth regulators (PGRs) and elicitors through plant cell culture technology is a promising strategy for enhancing the yield of medicinally important secondary metabolites. In this study, the effects of interplay between PGRs, elicitors and light regimes on cell cultures of F. indica have been investigated. The results showed that callus cultures resulted in maximum biomass formation (13.2 g/L) when incubated on solid MS (Murashige and Skoog) medium containing 1...
June 9, 2018: Journal of Photochemistry and Photobiology. B, Biology
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