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https://www.readbyqxmd.com/read/28550768/photochemical-studies-of-cis-ru-bpy-2-4-bzpy-co-pf6-2-and-cis-ru-bpy-2-4-bzpy-cl-pf6-blue-light-induced-nucleobase-binding
#1
Aurideia P de Sousa, Edinilton M Carvalho, Javier Ellena, Eduardo H S Sousa, Jackson R de Sousa, Luiz G F Lopes, Peter C Ford, Alda K M Holanda
The ruthenium(II) compounds cis-[Ru(bpy)2(4-bzpy)(CO)](PF6)2 (I) and cis-[Ru(bpy)2(4-bzpy)(Cl)](PF6) (II) (4-bzpy=4-benzoylpyridine, bpy=2,2'-bipyridine) were synthesized and characterized by spectroscopic and electrochemical techniques. The crystal structure of II was determined by X-ray diffraction. The photochemical behavior of I in aqueous solution shows that irradiation with ultraviolet light (365nm) releases both CO and 4-bzpy leading to the formation of the cis-[Ru(bpy)2(H2O)2](2+) ion as identified by NMR and electronic spectroscopy...
May 15, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28550516/mapping-the-spatio-temporal-distribution-of-key-vegetation-cover-properties-in-lowland-river-reaches-using-digital-photography
#2
Veerle Verschoren, Jonas Schoelynck, Kerst Buis, Fleur Visser, Patrick Meire, Stijn Temmerman
The presence of vegetation in stream ecosystems is highly dynamic in both space and time. A digital photography technique is developed to map aquatic vegetation cover at species level, which has a very high spatial and a flexible temporal resolution. A digital single-lens reflex (DSLR) camera mounted on a handheld telescopic pole is used. The low-altitude (5 m) orthogonal aerial images have a low spectral resolution (red-green-blue), high spatial resolution (∼1.9 pixels cm(-2), ∼1.3 cm length) and flexible temporal resolution (monthly)...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28548288/hypermineralization-and-high-osteocyte-lacunar-density-in-osteogenesis-imperfecta-type-v-bone-indicate-exuberant-primary-bone-formation
#3
Stéphane Blouin, Nadja Fratzl-Zelman, Francis H Glorieux, Paul Roschger, Klaus Klaushofer, Joan C Marini, Frank Rauch
In contrast to "classical" forms of Osteogenesis imperfecta (OI) types I to IV, caused by a mutation in COL1A1/A2, OI type V is due to a gain-of-function mutation in the IFITM5 gene, encoding the interferon-induced transmembrane protein 5, or bone-restricted ifitm-like protein (BRIL). Its phenotype distinctly differs from OI types I to IV by absence of blue sclerae and dentinogenesis imperfecta, by the occurrence of ossification disorders like hyperplastic callus and forearm interosseous membrane ossification...
May 26, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28547733/comparative-evaluation-of-post-traumatic-periodontal-ligament-cell-viability-using-three-storage-media
#4
V V Kokkali, V Bendgude, G Sharangpani
AIM: To evaluate the potential of milk, coconut water and buttermilk in maintaining periodontal ligament cell (PDL) viability. METHODS: Freshly extracted premolars (55) were divided into three experimental groups each having 15 teeth and the negative and positive control groups which had 5 teeth per group. The teeth in the experimental groups were immersed in their respective storage medium for a period of 75 min before the laboratory procedures were performed...
May 25, 2017: European Archives of Paediatric Dentistry: Official Journal of the European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/28546833/energy-down-converting-organic-fluorophore-functionalized-mesoporous-silica-hybrids-for-monolith-coated-light-emitting-diodes
#5
Markus Börgardts, Thomas J J Müller
The covalent attachment of organic fluorophores in mesoporous silica matrices for usage as energy down converting phosphors without employing inorganic transition or rare earth metals is reported in this article. Triethoxysilylpropyl-substituted derivatives of the blue emitting perylene, green emitting benzofurazane, and red emitting Nile red were synthesized and applied in the synthesis of mesoporous hybrid materials by postsynthetic grafting to commercially available MCM-41. These individually dye-functionalized hybrid materials are mixed in variable ratios to furnish a powder capable of emitting white light with CIE chromaticity coordinates of x = 0...
2017: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28546111/comparative-effect-of-photodynamic-therapy-on-separated-or-mixed-cultures-of-streptococcus-mutans-and-streptococcus-sanguinis
#6
Vanesa Pérez-Laguna, Luna Pérez-Artiaga, Verónica Lampaya-Pérez, Santiago Camacho López, Isabel García-Luque, María José Revillo, Santi Nonell, Yolanda Gilaberte, Antonio Rezusta
Antimicrobial photodynamic therapy (aPDT) has shown to exert a bactericidal effect against Streptococcus sanguinis and Streptococcus mutans. However, this efficacy has been reported for either type of bacteria separately. Bacterial suspensions of both strains, separately or together, were treated with concentrations of methylene blue (MB) and rose bengal (RB). Suspensions were irradiated with a light-emitting diode lamp (λ center at 625nm for MB and λ center at 515nm for RB) using a fluence of 18J/cm(2). RB-aPDT at concentrations of 0...
May 22, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28544211/highly-luminescent-and-ultra-stable-cspbbr3-pervoskite-quantum-dots-silica-alumina-monolith
#7
Zhichun Li, Long Kong, Shouqiang Huang, Liang Li
We successfully prepared QDs-silica/alumina monolith (QDs-SAM) by a simple sol-gel reaction of Al-Si single precursors with CsPbBr3 QDs blended in toluene solution, without adding water and catalyst. The resultant transparent monolith exhibits high photoluminescence quantum yields (PLQY) up to 90%, and good photostability under strong illumination of blue light for 300 h. We demonstrated that the preliminary ligand exchange of didodecyl dimethyl ammonium bromide (DDAB) was very important to protect CsPbBr3 QDs from the surface damages during sol-gel reaction, which not only allowed us to maintain the original optical properties of CsPbBr3 QDs but also avoided the aggregation of QDs and make the monolith transparent...
May 24, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28543810/in-vitro-bactericidal-activity-of-blue-light-465-nm-phototherapy-on-meticillin-susceptible-and-meticillin-resistant-staphylococcus-pseudintermedius
#8
Amy H Schnedeker, Lynette K Cole, Gwendolen Lorch, Sandra F Diaz, John Bonagura, Joshua B Daniels
BACKGROUND: Staphylococcus pseudintermedius is the most common cause of bacterial skin infections in dogs. Meticillin-resistant infections have become more common and are challenging to treat. Blue light phototherapy may be an option for treating these infections. HYPOTHESIS/OBJECTIVES: The objective of this study was to measure the in vitro bactericidal activity of 465 nm blue light on meticillin-susceptible Staphylococcus pseudintermedius (MSSP) and meticillin-resistant Staphylococcus pseudintermedius (MRSP)...
May 22, 2017: Veterinary Dermatology
https://www.readbyqxmd.com/read/28543056/cloning-and-analysis-of-the-glwc-1-and-glwc-2-genes-encoding-putative-blue-light-photoreceptor-from-ganoderma-lucidum
#9
Xinran Xu, Xiangdong Chen, Wumengxiao Yu, Yu Liu, Weiwei Zhang, Jin Lan
Blue light plays an important role during the growth of Ganoderma lucidum, one of the best-known medicinal macrofungi in China. In the present study, we cloned Glwc-1 and Glwc-2, the homologue of the blue light photoreceptors Ncwc-1 and Ncwc-2 of Neurospora crassa, from G. lucidum. The deduced amino acid sequence of Glwc-1 contained the similar function domains as NcWC-1 including LOV, PAS B, PAS C, and PAC domains. The deduced amino acid sequence of Glwc-2 contained PAS domain and GATA-type zinc finger (Znf) domain as well as NcWC-2...
May 23, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/28542006/an-efficient-affordable-optically-stimulated-luminescent-osl-annealer
#10
Sara A Abraham, Samuel J Frank, Kimberlee J Kearfott
Optically stimulated luminescent (OSL) dosimeters are devices used for measuring doses of ionizing radiation. Signal is stored within an OSL material so that when stimulated with light, light of a specific wavelength is emitted in proportion to the integrated ionizing radiation dose. Each interrogation of the material results in the loss of a small fraction of signal, thus allowing multiple interrogations leading to more accurate measurements of dose. In order to reuse a dosimeter, the residual signals from prior doses must be taken into account and subtracted from current readings, adding uncertainty to any future measurements...
July 2017: Health Physics
https://www.readbyqxmd.com/read/28538515/effect-of-exposure-to-short-wavelength-light-on-susceptibility-to-motion-sickness
#11
Kyungshil Kim, Kazumi Hirayama, Kazuki Yoshida, Rika Yano, Masayuki Abe, Mika Otsuki, Satoshi Sakuraba, Shinya Sakai
This randomized cross-over study tested the hypothesis that exposure to short-wavelength light induces symptoms of motion sickness (MS). The study participants were 28 healthy adults (14 women; mean age±SD, 25.96±3.11 years). Two stimuli oscillating within a range of 0.4-0.6 Hz were used to induce MS: a blue wave stimulus with short-wavelength light (460 nm) and a green wave stimulus with middle-wavelength light (555 nm). All participants were exposed to both stimuli throughout two separate periods...
May 19, 2017: Neuroreport
https://www.readbyqxmd.com/read/28538154/effect-of-ca-2-to-sphingomyelin-investigated-by-sum-frequency-generation-vibrational-spectroscopy
#12
Rong-Juan Feng, Lu Lin, Yi-Yi Li, Ming-Hua Liu, Yuan Guo, Zhen Zhang
The interactions between Ca(2+) ions and sphingomyelin play crucial roles in a wide range of cellular activities. However, little is known about the molecular details of the interactions at interfaces. In this work, we investigated the interactions between Ca(2+) ions and egg sphingomyelin (ESM) Langmuir monolayers at the air/water interface by subwavenumber high-resolution broadband sum frequency generation vibrational spectroscopy (HR-BB-SFG-VS). We show that Ca(2+) ions can induce ordering of the acyl chains in the ESM monolayer...
May 23, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28538148/active-site-pka-determination-for-photoactive-yellow-protein-rationalizes-slow-ground-state-recovery
#13
Nur Alia Oktaviani, Trijntje J Pool, Yuichi Yoshimura, Hironari Kamikubo, Ruud M Scheek, Mikio Kataoka, Frans A A Mulder
The ability to avoid blue-light radiation is crucial for bacteria to survive. In Halorhodospira halophila, the putative receptor for this response is known as photoactive yellow protein (PYP). Its response to blue light is mediated by changes in the optical properties of the chromophore para-coumaric acid (pCA) in the protein active site. PYP displays photocycle kinetics with a strong pH dependence for ground-state recovery, which has remained enigmatic. To resolve this problem, a comprehensive pKa determination of the active-site residues of PYP is required...
May 23, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28537402/an-efficient-blue-emissive-metal-organic-framework-mof-for-lanthanide-encapsulated-multicolor-and-stimuli-responsive-luminescence
#14
Wei Huang, Feifei Pan, Yang Liu, Shuaidan Huang, Yujie Li, Juan Yong, Yao Li, Alexander M Kirillov, Dayu Wu
A novel blue-emitting Zn(II) MOF featuring parallel 2D+2D interpenetrated layers and tubelike channels was generated and shown to efficiently accommodate lanthanide(III) cations (Ln(3+) = Eu(3+), Tb(3+), or a mixture of Eu(3+)/Tb(3+)), resulting in the Ln(3+)-encapsulated functional materials with a tunable emission color, including red, green, and nearly pure white light. Furthermore, the thermal-responsive luminescence was investigated for the lanthanide-codoped MOF to exhibit the chromic transition from white at room temperature to blue around liquid nitrogen temperature...
May 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28536783/ph-influences-the-biocompatibility-of-methylene-blue-solutions
#15
David Jonathan Rodrigues Gusman, Luciano Tavares Angelo Cintra, Vivian Cristina Noronha Novaes, Henrique Rinaldi Matheus, Nathália Januario de Araujo, Juliano Milanezi de Almeida
OBJECTIVE: The aim of this study was to investigate the biocompatibility of methylene blue at different pH levels through the method of implantation in subcutaneous tissue. MATERIALS AND METHODS: Eighty-four sterilized polyethylene tubes were allocated in the subcutaneous tissue of 28 rats, each one receiving four tubes, set into four groups: group tube (G-T)-empty tube, fibrin group (G-F)-tube filled with fibrin sponge, group methylene blue pH 7 (G-MB/pH 7)-tube filled with fibrin sponge soaked by methylene blue (100 μg/ml) at pH 7...
May 23, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28535065/silica-polymerization-from-supersaturated-dilute-aqueous-solutions-in-the-presence-of-alkaline-earth-salts
#16
Marina Kley, Andreas Kempter, Volodymyr Boyko, Klaus Huber
The early stages of silica polymerization in aqueous solution proceeds according to a mechanism based on three steps: nucleation, particle growth and agglomeration of the particles. Application of time-resolved static and dynamic light scattering as a powerful in-situ technique in combination with spectrophotometric analysis of the monomer consumption based on the molybdenum blue method was carried out to further investigate this 3-step process. Experiments were carried out at four different initial silicic acid contents covering a range between 350 ppm and 750 ppm in the presence of either 10 mM NaCl or 5 mM of a mixture of CaCl2 and MgCl2...
May 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28532320/effects-of-light-quality-on-pod-elongation-in-soybean-glycine-max-l-merr-and-cowpea-vigna-unguiculata-l-walp
#17
Seiya Tanaka, Nobuyuki Ario, Andressa Camila Seiko Nakagawa, Yuki Tomita, Naoki Murayama, Takatoshi Taniguchi, Norimitsu Hamaoka, Mari Iwaya-Inoue, Yushi Ishibashi
Soybean pods are located at the nodes, where they are in the shadow, whereas cowpea pods are located outside of the leaves and are exposed to sunlight. To compare the effects of light quality on pod growth in soybean and cowpea, we measured the length of pods treated with white, blue, red or far-red light. In both species, pods elongated faster during the dark period than during the light period in all light treatments except red light treatment in cowpea. Red light significantly suppressed pod elongation in soybean during the dark and light periods...
May 22, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28531143/a-4-phenoxyphenol-derivative-exerts-inhibitory-effects-on-human-hepatocellular-carcinoma-cells-through-regulating-autophagy-and-apoptosis-accompanied-by-downregulating-%C3%AE-tubulin-expression
#18
Wen-Tsan Chang, Wangta Liu, Yi-Han Chiu, Bing-Hung Chen, Shih-Chang Chuang, Yen-Chun Chen, Yun-Tzh Hsu, Mei-Jei Lu, Shean-Jaw Chiou, Chon-Kit Chou, Chien-Chih Chiu
Hepatocellular carcinoma (HCC) is a leading cancer worldwide. Advanced HCCs are usually resistant to anticancer drugs, causing unsatisfactory chemotherapy outcomes. In this study, we showed that a 4-phenoxyphenol derivative, 4-[4-(4-hydroxyphenoxy)phenoxy]phenol (4-HPPP), exerts an inhibitory activity against two HCC cell lines, Huh7 and Ha22T. We further investigated the anti-HCC activities of 4-HPPP, including anti-proliferation and induction of apoptosis. Our results showed that higher dosage of 4-HPPP downregulates the expression of α-tubulin and causes nuclear enlargement in both the Huh-7 and Ha22T cell lines...
May 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28530801/hydrogen-bonding-environment-of-the-n3-h-group-of-fmn-in-the-lov-domains-of-phototropins
#19
Tatsuya Iwata, Dai Nozaki, Atsushi Yamamoto, Takayuki Koyama, Yasuzo Nishina, Kiyoshi Shiga, Satoru Tokutomi, Masashi Unno, Hideki Kandori
LOV (light-oxygen-voltage) domain is a flavin-binding blue-light receptor domain originally found in plant phototropin, a photoreceptor for phototropism, chloroplast movement and stomata opening. LOV domains are available as optogenetics tools for photosensory domain of fusion proteins. Therefore, it is important to investigate how LOV domains show light-induced structural changes not only for the elucidation of regulation mechanism of kinase domain but also for the appropriate activation of other functional domains by LOV domain...
May 22, 2017: Biochemistry
https://www.readbyqxmd.com/read/28530763/surface-oxygen-vacancy-induced-solar-light-activity-enhancement-of-a-cdwo4-bi2o2co3-core-shell-heterostructure-photocatalyst
#20
Chunming Yang, Guimei Gao, Junjun Zhang, Ruiping Liu, Ruicheng Fan, Ming Zhao, Yongwang Wang, Shucai Gan
A CdWO4/Bi2O2CO3 core-shell heterostructure photocatalyst was fabricated via a facile two-step hydrothermal process. Flower-like Bi2O2CO3 was synthesized and functioned as the cores on which CdWO4 nanorods were coated as the shells. Photoluminescence (PL) spectra and electron paramagnetic resonance (EPR) demonstrate that the CdWO4/Bi2O2CO3 core-shell heterostructure photocatalyst possesses a large amount of oxygen vacancies, which induce defect levels in the band gap and help to broaden light absorption. The photocatalyst exhibits enhanced photocatalytic activity for Rhodamine B (RhB), methylene blue (MB), methyl orange (MO), and colorless contaminant phenol degradation under solar light irradiation...
May 22, 2017: Physical Chemistry Chemical Physics: PCCP
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