journal
MENU ▼
Read by QxMD icon Read
search

Photochemistry and Photobiology

journal
https://www.readbyqxmd.com/read/29166541/photochemcad-3-diverse-modules-for-photophysical-calculations-with-multiple-spectral-databases
#1
Masahiko Taniguchi, Hai Du, Jonathan S Lindsey
The PhotochemCAD program, developed over 30 years, is described comprehensively with focus on features of the most recent version (PhotochemCAD 3). The program is equipped with a streamlined user interface and provisions for handling multiple spectral databases. Eight modules enable calculations to be performed on the basis of the spectra in the databases. The calculational modules provide results concerning properties of individual compounds (oscillator strength, transition dipole moment, natural radiative lifetime), interactions of multiple compounds (Förster energy transfer, Dexter energy transfer, analysis of energy transfer among an array of chromophores), and composition of mixtures (multicomponent analysis)...
November 22, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29166538/antimicrobial-photodynamic-therapy-associated-with-conventional-endodontic-treatment-a-clinical-and-molecular-microbiological-study
#2
Caroline C da Silva, Sérgio P Chaves Júnior, Gabriela L D Pereira, Karla B F C da Fontes, Lívia A A Antunes, Helvécio C C Póvoa, Leonardo S Antunes, Natalia L P Póvoa Iorio
This study evaluated antimicrobial photodynamic therapy (aPDT) as an adjunct to endodontic treatment. Ten uniradicular teeth (control group (CG)= 4 (2 and test group (TG)= 6) with primary endodontic infections, from both genders, between 17 and 65 years old, were analyzed. Microbiological samples were collected before and after chemical-mechanical instrumentation (CMI), after aPDT (for the TG), and after the removal of the temporary restorations (second session). In TG, the aPDT was performed with 100 μg/mL methylene blue and irradiated with low power laser (InGaAIP, 660 nm; 100 mW; 40 sec) with a fiber-coupled optical laser...
November 22, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29166537/database-of-absorption-and-fluorescence-spectra-of-300-common-compounds-for-use-in-photochemcad
#3
Masahiko Taniguchi, Jonathan S Lindsey
The design of new molecules for photochemical studies typically requires knowledge of spectral features of pertinent chromophores beginning with the absorption spectrum (λabs ) and accompanying molar absorption coefficient (ε, M(-1) cm(-1) ) and often extending to the fluorescence spectrum (λem ) and fluorescence quantum yield (Φf ), where the fluorescence properties may be of direct relevance or useful as proxies to gain insight into the nature of the first excited singlet state. PhotochemCAD databases, developed over a period of 30 years, are described here...
November 22, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29164629/impact-of-ultraviolet-radiation-on-expression-of-transforming-growth-factor-beta-smad2-metalloproteinases-cathepsin-k-and-progerin
#4
Magdalena Ciążyńska, Igor A Bednarski, Karolina Wódz, Joanna Narbutt, Michał Sobjanek, Anna Woźniacka, Aleksandra Lesiak
Ultraviolet radiation (UVR) is one of the most important environmental factors involved in photoaging. Exposure to UVR leads to dysregulation of expression of cell-cycle-related proteins which play key role in skin photodegradation that pretends to develop carcinogenesis. This study examines the role of various UVB doses on the expression of transforming growth factor beta (TGF-β), Smad2, cathepsin K, progerin and matrix metalloproteinases (MMPs)-1,-3,-8,-9. A group consisting of 63 healthy individuals underwent one of the following treatments: 1) whole-body exposed to UVB irradiation on each of 10 consecutive days with 0...
November 22, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29164625/mechanisms-and-mitochondrial-redox-signaling-in-photobiomodulation
#5
Michael R Hamblin
Photobiomodulation (PBM) involves the use of red or near-infrared light at low power densities to produce a beneficial effect on cells or tissues. PBM therapy is used to reduce pain, inflammation, edema, and to regenerate damaged tissues such as wounds, bones and tendons. The primary site of light absorption in mammalian cells has been identified as the mitochondria, and more specifically, cytochrome c oxidase (CCO). It is hypothesized that inhibitory nitric oxide can be dissociated from CCO thus restoring electron transport and increasing mitochondrial membrane potential...
November 22, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29164624/suppression-of-uvb-mediated-matrix-metalloproteinase-generation-by-sorbus-commixta-twig-extract-in-human-dermal-fibroblasts
#6
Song Hua Xuan, Young Min Park, So Hyun Park, Hyo Jin Jeong, Soo Nam Park
Sorbus commixta is a traditional oriental medicinal plant that grows in East Asian countries such as Korea, Japan, and China. The twig of S. commixta has been considered valuable for centuries to treat diseases including asthma, cough, and other bronchial disorders. However, the effect of S. commixta twig extract on human skin has not been investigated well. The present study aimed at assessing the anti-photoaging effect of S. commixta twig ethanol extract (STE) on ultraviolet B (UVB)-induced matrix metalloproteinase (MMP) levels and its underlying mechanism in human dermal fibroblasts...
November 22, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29164619/nanoflower-like-yttrium-doped-zno-photocatalyst-for-the-degradation-of-methylene-blue-dye
#7
Hemalatha Parangusan, Deepalekshmi Ponnamma, Mariam Al Ali Al-Maadeed, Alagar Marimuthu
Pure ZnO and Yttrium doped (Y-doped) ZnO at various mol% with flower-like nanostructures are synthesized by a microwave-assisted sol-gel method, followed by investigating the morphologies, crystal structures, optical properties and photocatalytic performances. While the phase formations are detected by X-ray diffraction technique, both scanning and transmission electron microscopy images clearly depict the flower-like morphology of ZnO and Y-doped ZnO samples. Formation of flower petals are from the nanoparticles that grew and connected by orientation attachment process...
November 22, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29164618/analysis-of-erythemal-uvb-dose-received-inside-a-car-in-valencia-spain
#8
Gonzalo Gurrea Ysasi, Vicente Blanca Giménez, Juan Carlos Moreno, MªAntonia Serrano
Continuous exposures to ultraviolet radiation can lead to harmful effects on human skin. Professional drivers may spend more than 8 hours per day inside a vehicle. This paper describes an analysis of the UVER (erythemal ultraviolet radiation) received by a driver and passenger inside a vehicle. A 3-door Peugeot 206 was used for the study. VioSpor Blue Line dosimeters (with a response profile close to that of human skin) were used to measure the erythematic dose of UV radiation (able to produce erythema on human skin)...
November 22, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29164617/differential-perturbation-of-the-protrotropic-equilibrium-of-a-biological-photosensitizer-within-bile-salt-aggregates-of-varying-hydrophobicity-a-fluorimetric-investigation
#9
Riya Sett, Nikhil Guchhait
The present work reveals the binding interactions of a credible cancer cell photosensitizer, harmane (HM) with some selected bile salt aggregates of dissimilar hydrophobicity viz. sodium deoxycholate (NaDC), sodium cholate (NaC) and sodium taurocholate (NaTC). The explicit variation of the prototropic equilibrium of the photosensitizer both in the ground and excited state has been utilized to scrutinize the interaction phenomena. Differential modulation in the prototropic equilibrium of HM in the aforesaid aggregates has been explained on the basis of the structural dissimilarities of the bile-salt monomers...
November 22, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29143339/cell-death-pathways-associated-with-photodynamic-therapy-an-update
#10
David Kessel, Nancy L Oleinick
Photodynamic therapy (PDT) has the potential to make a significant impact on cancer treatment. PDT can sensitize malignant tissues to light, leading to a highly selective effect if an appropriate light dose can be delivered. Variations in light distribution and drug delivery, along with impaired efficacy in hypoxic regions, can reduce the overall tumor response. There is also evidence that malignant cells surviving PDT may become more aggressive than the initial tumor population. Promotion of more effective direct tumor eradication is therefore an important goal...
November 16, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29143338/extracellular-matrix-containing-in-vitro-three-dimensional-tumour-models-in-photodynamic-therapy-related-research
#11
Beata Čunderlíková
Three-dimensional (3D) tumour models have been intensively evaluated for their use in cancer research and there is a strong rationale behind using 3D cell cultures in photodynamic therapy (PDT)-related experimentation. In this contribution, it is explained why 3D cell cultures containing extracellular matrix (ECM) are preferred for this purpose. Results of experimental studies utilizing ECM-containing 3D cellular models in PDT research are summarized. Finally, design of in vitro 3D models that would provide clinically relevant information is discussed...
November 16, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29143326/lncrna-rp11-670e13-6-regulates-cell-cycle-progression-in-uvb-damaged-human-dermal-fibroblasts
#12
Mengna Li, Li Li, Xiaofeng Zhang, Yan Yan, Baoxi Wang
Long noncoding RNAs (lncRNAs) have gained extensive attention in recent years, however, their effects on ultraviolet (UV) radiation-induced skin photodamage remain to be elucidated. In this study, we performed high-throughput RNA sequencing and comprehensive bioinformatics analyses to characterize the transcriptome profiles including lncRNAs and mRNAs in UVB-irradiated primary human dermal fibroblasts (HDFs) and to explore the roles of lncRNAs in photoaging. Quantitative reverse transcription-polymerase chain reaction amplification was performed to verify the differentially expressed genes...
November 16, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29111581/deactivation-and-regeneration-of-natao3-photocatalyst-in-co-operating-dehydrogenation-coupling-of-isopropanol-and-hydrogenation-coupling-of-acetone-reaction-system
#13
Baoyue Cao, Yan Yu, Shan Xu, Xiangting Wang, Li Zhang, Zhijian Wang, Shumin Wang, Guochun Zhang
Photocatalyst activity is influenced by many factors, such as adsorption of by-products, runoff of surface hydroxyl groups, and carriers. In this study, a simple and efficient photocatalyst regeneration method was developed. Results indicated that NaTaO3 photocatalyst lost its photo-activity after three cycles of reaction that involves coupling of isopropanol and hydrogenation coupling of acetone reaction system. Runoff of Na on the surface was the main reason for the deactivation of NaTaO3 photocatalyst. After hydrothermal treatment of the deactivated NaTaO3 with 10 M NaOH at 180 °C for 12 h, its photocatalytic activity was restored to the original level...
November 7, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29110305/wellington-playgrounds-uncovered-an-examination-of-solar-ultraviolet-radiation-and-shade-protection-in-new-zealand
#14
Ryan Gage, Chris O'Toole, Andrew Robinson, Anthony Reeder, Louise Signal, Christina Mackay
Providing effective shade in summer recreation spaces can reduce children's risk of skin cancer. This study explored the quantity and protective quality of shade in Wellington, New Zealand playgrounds. Two researchers visited 50 randomly-selected playgrounds during peak ultraviolet radiation (UVR) hours in summer and recorded the mean shade cover of playground equipment, seats, tables and open areas. A Solarmeter was used to calculate the proportion of UVR blocked by each built structure and tree. The results found that 95% of playground equipment and 64% of sitting and eating areas had no shade protection...
November 7, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29110298/long-term-genoprotection-effect-of-sechium-edule-fruit-extract-against-uva-irradiation-in-keratinocytes
#15
Elodie Metral, Walid Rachidi, Odile Damour, Frédéric Demarne, Nicolas Bechetoille
Photoprotection is essential to prevent the long-term deleterious effects of ultraviolet (UV), including skin cancer and photoaging. So far, there has been an increase in the use of natural bioactive phytochemicals for the development of more effective skin photoprotective agents. However, the molecular mechanisms underlying the photochemoprotection activity of such compounds remain largely unknown. The objective of this study was to investigate the effects of a Sechium edule fruit extract (SEE) in terms of photoprotection against UVA in primary human keratinocytes...
November 7, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29105763/synthesis-photophysical-and-computational-study-of-novel-coumarin-based-organic-dyes
#16
Mahadev N Kumbar, Madivalagouda S Sannaikar, Saba Kauser J Shaikh, Atulkumar A Kamble, Manjunath N Wari, Sanjeev R Inamdar, Qiquan Qiao, N R Bhavya, M Mahendra, D Jagadeesh Prasad, Ravindra R Kamble
A series of novel coumarin pyrazoline moieties combined with tetrazoles, 3-(1-phenyl-4-(1H-tetrazol-5-yl)-1H-pyrazol-3-yl)-2H-chromen-2-one, 6-chloro-3-(1-phenyl-4-(1H-tetrazol-5-yl)-1H-pyrazol-3-yl)-2H-chromen-2-one, 6-bromo-3-(1-phenyl-4-(1H-tetrazol-5-yl)-1H-pyrazol-3-yl)-2H-chromen-2-one and 6-bromo-3-(1-(4-bromophenyl)-4-(1H-tetrazol-5-yl)-1H pyrazol-3-yl)-2H-chromen-2-one 7(a-d) were designed and synthesized. Single crystal X-ray diffraction and their interactions were studied by Hirshfeld Surface Analysis...
November 6, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29105092/ultraviolet-a-eye-irradiation-ameliorates-atopic-dermatitis-via-p53-and-clock-gene-proteins-in-nc-nga-mice
#17
Keiichi Hiramoto, Yurika Yamate, Satoshi Yokoyama
Atopic dermatitis (AD) is a widespread chronic skin condition that severely affects quality of life and can lead to more serious complications. Although ultraviolet (UV)A eye irradiation can exert various effects on the skin, it is unknown whether UVA can affect AD. To investigate potential associations, we used an NC/Nga mouse model of AD to study the effects of UVA eye irradiation. The eyes of mice were irradiated with a UVA dose of 100 kJ/m(2) using a FL20SBLB-A lamp. Our histological data demonstrated that AD symptoms could be ameliorated by UVA eye irradiation...
November 4, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29052844/synthesis-of-pb9-po4-6-ag3-po4-composite-photocatalysts-with-enhanced-visible-light-photocatalytic-activity
#18
Caiping Guo, Limin Song, Shujuan Zhang
Pb9 (PO4 )6 /Ag3 PO4 photocatalysts with different amounts of Pb9 (PO4 )6 were successfully synthesized by the ion exchange method. The catalysts were characterized by X-ray diffractometry (XRD), High resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Brunauer- Emmett-Teller (BET), Fourier transform infrared spectrometry (FT-IS), and ultraviolet-visible (UV-vis) spectroscopy. All Pb9 (PO4 )6 /Ag3 PO4 photocatalysts show much higher photocatalytic activities than pure Ag3 PO4 under visible light irradiation in the methyl-orange (MO) decomposition...
October 20, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29023831/photochemistry-and-photophysics-of-the-3-styrylidenebenz-e-indanes
#19
Jack Saltiel, Shipra Gupta, David W Eaker, Andrew M Kropp, V K Ratheesh Kumar
The photochemical and photophysical properties of the extended conformers of trans- and cis-1-(2-naphthyl)-2-phenylethenes (t- and c-NPEB ) are strikingly different than those of their rigid analogues, trans- and cis-3-styrylidenebenz[e]indane (t- and c-BPE). The fluorescence quantum yield and lifetime at 25 °C in methylcyclohexane drop from 0.76 and 22.2 ns in t-NPEB to 0.0051 and 0.25 ns in t-BPE and there are complementary changes in the photoisomerization quantum yields. In both cases photoisomerization occurs in S2 , a stilbenic excited state...
October 10, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28977677/signaling-cascades-activated-by-uvb-in-human-melanocytes-lead-to-the-increased-expression-of-melanocyte-receptors-endothelin-b-receptor-and-c-kit-%C3%A2
#20
Shuko Terazawa, Genji Imokawa
A single exposure of normal human melanocytes (NHMs) to ultraviolet B (UVB) radiation induces a distinct increase in the expression of c-KIT and endothelin B receptor (EDNRB) and up-regulates the expression of microphthalmia-associated transcription factor (MITF). In this review, we clarify the signaling mechanisms by which UVB stimulates the expression of MITF in NHMs, thus leading to up-regulation of those two important melanogenic receptors. The increased expression of MITF in UVB-exposed NHMs is accompanied by a markedly stimulated and prolonged phosphorylation of p38/CREB...
October 4, 2017: Photochemistry and Photobiology
journal
journal
23907
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"