keyword
MENU ▼
Read by QxMD icon Read
search

Photoe

keyword
https://www.readbyqxmd.com/read/29145103/gold-chlorophyll-a-hybrid-nanoparticles-and-chlorophyll-a-cetyltrimethylammonium-chloride-self-assembled-suprastructures-as-novel-carriers-for-chlorophyll-a-delivery-in-water-medium-photoactivity-and-photostability
#1
Vito Rizzi, Davide Vurro, Tiziana Placido, Paola Fini, Andrea Petrella, Paola Semeraro, Pinalysa Cosma
The stability of Chlorophyll a in water during prolonged exposure, at room temperature, to a neon lamp has been investigated by means of UV-vis and fluorescence spectroscopies. In addition, the Chlorophyll a (photo)stability evaluation in presence of suitable carriers has been performed in order to investigate its reactivity under the same conditions, for possible and future applications in Antimicrobial Photodynamic Therapy. Cetyltrimethylammonium chloride was chosen to solubilize Chlorophyll a in water. While, cetyltrimethylammonium chloride-capped gold nanoparticles offer a great opportunity because combine the Chlorophyll a action, used as a photosensitizer in Antimicrobial Photodynamic Therapy, with gold nanoparticles effect used in photothermal therapy...
November 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29144983/albumin-coordinated-assembly-of-clearable-platinum-nanodots-for-photo-induced-cancer-theranostics
#2
Yong'an Tang, Tao Yang, Qiaoli Wang, Xiaoyan Lv, Xue Song, Hengte Ke, Zhengqing Guo, Xiaoqing Huang, Jun Hu, Zifu Li, Peng Yang, Xiangliang Yang, Huabing Chen
Photoactive noble metal nanoparticles are of increasing importance toward personalized cancer therapy in the field of precision nanomedicine. A critical challenge remains in the exploration of clinically potential noble metal nanoparticles for highly efficient cancer theranostics. Here, we introduce albumin-coordinated assembly of clearable Pt nanodots (Pt-NDs) with monodisperse nanostructure as high-performance theranostic agents for imaging-guided photothermal tumor ablation. We precisely manipulate the reduction and growth of tetravalent Pt ions into ultrasmall nanodots through albumin-directed growth kinetics, thereby leading to the synthesis of monodisperse 6...
October 20, 2017: Biomaterials
https://www.readbyqxmd.com/read/29144760/multi-spectroscopic-and-theoretical-exploration-on-the-comparative-binding-aspects-of-the-bio-flavonoid-fisetin-with-triple-and-double-helical-forms-of-rna
#3
Sutanwi Bhuiya, Lucy Haque, Rapti Goswami, Suman Das
The interactions of RNA triplex (U.A*U) and duplex (A.U) with the naturally occurring flavonoid fisetin (FTN) have been examined at pH 7.0 using various spectroscopic, viscometric and theoretical studies. Experimental observations showed that the ligand binds with both double and triple helical forms of RNA, although the binding affinity is greater for the triplex structure (5.94106 M-1) compared to the duplex counterpart (1.0105 M-1). Thermal melting experiments revealed that the Hoogsteen base paired third strand of triplex was stabilized to a greater extent (~14 C) compared to the Watson-Crick base paired second strand (~4 C) in presence of FTN...
November 16, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29144723/inorganic-strengthened-hydrogel-membrane-as-regenerative-periosteum
#4
Tianwen Xin, Yong Gu, Ruoyu Cheng, Jincheng Tang, Zhiyong Sun, Wenguo Cui, Liang Chen
Periosteum plays the pivotal role in neomineralization, vascularization and protection during bone tissue regeneration. However, many artificial periosteum focused only on protection and lacked of the osteogenesis and angiogenesis functional capacity. In this study, we developed a novelty inorganic strengthened gelatin hydrogel membrane via inorganic and organic co-cross-linked double network as artificial periosteum for enhancing the durable angiogenesis and osteogenesis in bone reconstruction. Mesoporous bioactive glass nanoparticles (MBGNs) chemically modified with photo-cross-linkable gelatin derivative (GelMA) were further incorporated into GelMA to fabricate an organic/inorganic co-cross-linked hydrogel membrane (GelMA-G-MBGNs)...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29144013/photocontrolled-synthesis-of-abiotic-sequence-defined-oligo-phosphodiester-s
#5
Niklas Felix König, Sofia Telitel, Salomé Poyer, Laurence Charles, Jean-François Lutz
A photoregulated phosphoramidite iterative process is studied for the synthesis of non-natural, digitally encoded oligo(phosphodiester)s. The oligomers are prepared using two reactive phosphoramidite monomers containing a 2-(2-nitrophenyl)propoxycarbonyl (NPPOC) protected OH group. The stepwise synthesis is performed on an OH-functional soluble polystyrene support, which allows recycling by precipitation in a nonsolvent. Repeating cycles involving phosphoramidite coupling, oxidation of phosphite to phosphate, and NPPOC deprotection by light irradiation at λ = 365 nm are performed in order to prepare oligomers with different lengths and sequences...
November 16, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29143523/new-insights-into-electronic-structure-and-photoelectrochemical-property-of-nitrogen-doped-hnb3o8-behaviors-via-a-combined-in-situ-experimental-with-dft-investigation
#6
Xiaobin Liu, Zhenyu Wang, Peng Chen, Huanfu Zhou, Ling Bing Kong, Chunming Niu, Wenxiu Que
Nitrogen-doping approach has been intensively adopted to improve the various properties of metal oxides-especially for adjusting energy band structure and extending photo-response range of oxide photocatalyst. However, nitrogen doped behavior is still unintelligible and complex due to the diversity of the compositions and crystal structures. In this work, new insights into electronic structure and photoelectrochemical property of nitrogen-doping HNb3O8 behaviors were presented. On the one hand, we utilized an in-situ experimental strategy to ascertain the effect of nitrogen-doping on the energy band and photoelectrochemical (PEC) property of HNb3O8 and nitrogen-doped HNb3O8 (N-HNb3O8)...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29143417/can-antarctic-lichens-acclimatise-to-changes-in-temperature
#7
Claudia Colesie, Burkhard Büdel, Vaughan Hurry, T G Allan Green
The Antarctic Peninsula, a tundra biome dominated by lichens and bryophytes, is an ecozone undergoing rapid temperature shifts. Such changes may demand a high physiological plasticity of the local lichen species in order for them to maintain their role as key drivers in this pristine habitat. This study examines the response of net photosynthesis and respiration to increasing temperatures for three Antarctic lichen species with different ecological response amplitudes. We hypothesise that negative effects caused by increased temperatures can be mitigated by thermal acclimation of respiration and/or photosynthesis...
November 15, 2017: Global Change Biology
https://www.readbyqxmd.com/read/29143136/investigation-of-arginine-a-specific-cysteine-proteinase-gene-expression-profiling-in-clinical-porphyromonas-gingivalis-isolates-against-photokilling-action-of-the-photo-activated-disinfection
#8
Maryam Pourhajibagher, Roghayeh Ghorbanzadeh, Abbas Bahador
Porphyromonas gingivalis is a significant root canal pathogen capable of causing endodontic infections, which during their treatment may receive sub-lethal doses of photo-activated disinfection (sPAD). As sPAD can influence microbial virulence, this study was designed to evaluate the effect of sPAD on gene expression level of arginine A-specific cysteine proteinase (rgpA), as one of the underlying virulence factors involved in the development of endodontic infection via P. gingivalis strains. To find out the sPAD against 16 clinical isolates of PAD-resistant P...
November 15, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29143052/photo-enhanced-antibacterial-activity-of-zno-graphene-quantum-dot-nanocomposites
#9
Junli Liu, Mauricio D Rojas-Andrade, Gustavo Chata, Yi Peng, Graham Roseman, Jia-En Lu, Glenn L Millhauser, Chad Saltikov, Shaowei Chen
Synthesis of new, highly active antibacterial agents has become increasingly important in light of emerging antibiotic resistance. In the present study, ZnO/graphene quantum dot (GQD) nanocomposites were produced by a facile hydrothermal method and characterized by an array of microscopic and spectroscopic measurements, including transmission electron microscopy, X-ray photoelectron spectroscopy, UV-vis and photoluminescence spectroscopy. Antibacterial activity of the ZnO/GQD nanocomposites was evaluated with Escherichia coli within the context of minimum inhibitory concentration and the reduction of the number of bacterial colonies in a standard plate count method, in comparison to those with ZnO and GQD separately...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29142546/comparison-of-analgesic-effect-of-preoperative-topical-diclofenac-versus-ketorolac-on-postoperative-pain-after-corneal-collagen-cross-linkage
#10
Murtaza Sameen, Muhammad Saim Khan, Asad Habib, Muhammad Amer Yaqub, Mazhar Ishaq
Objective: To compare post-operative pain relieving effect of topical diclofenac 0.1% versus ketorolac 0.5% in Corneal Collagen Cross Linking (CXL) for patients diagnosed with keratoconus. Methods: This randomized controlled trial was carried out for six months from October 2016 to March 2017. We included young patients having keratoconus with k-readings greater than 47D and central corneal thickness more than 400 microns. All the patients received single dose one drop of topical diclofenac 0...
September 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/29141404/photoinduced-inverse-spin-hall-effect-of-surface-states-in-the-topological-insulator-bi2se3
#11
Jinling Yu, Xiaolin Zeng, Liguo Zhang, Ke He, Shuying Cheng, Yunfeng Lai, Wei Huang, Yonghai Chen, Chunming Yin, Qikun Xue
The three-dimensional (3D) topological insulator (TI) Bi2Se3 exhibits topologically protected, linearly dispersing Dirac surface states (SSs). To access the intriguing properties of these SSs, it is important to distinguish them from the coexisting two-dimensional electron gas (2DEG) on the surface. Here, we use circularly polarized light to induce the inverse spin Hall effect in a Bi2Se3 thin film at different temperatures (i.e., from 77 to 300 K). It is demonstrated that the photoinduced inverse spin Hall effect (PISHE) of the top SSs and the 2DEG can be separated based on their opposite signs...
November 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/29140688/an-rna-chemical-proteomics-approach-reveals-the-n6-methyladenosine-m6a-regulated-protein-rna-interactome
#12
A Emilia Arguello, Amanda N DeLiberto, Ralph Kleiner
Epitranscriptomic RNA modifications can regulate mRNA function; however, there is a major gap in our understanding of the biochemical mechanisms mediating their effects. Here, we develop a chemical proteomics approach relying upon photo-crosslinking with synthetic diazirine-containing RNA probes and quantitative proteomics to profile RNA-protein interactions regulated by N6-methyladenosine (m6A), the most abundant internal modification in eukaryotic RNA. In addition to identifying YTH domain-containing proteins and ALKBH5, known interactors of this modification, we find that FMR1 and LRPPRC, two proteins associated with human disease, 'read' this modification...
November 15, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29140390/a-carboxylated-graphene-nanodisks-glucose-oxidase-nanotags-and-mn-cds-tio2-matrix-based-dual-signal-amplification-strategy-for-ultrasensitive-photoelectrochemical-detection-of-tumor-markers
#13
Jie Song, Shuo Wu, Xinlan Yang, Jingli Yuan
Graphene nanodisks with good conductivity and plenty of edge sites were synthesized to load glucose oxidase (GRD-GOD) and coupled with a Mn(2+) doped CdS quantum dot (QD) modified TiO2 electrode (CdS:Mn/TiO2) for a highly sensitive photoelectrochemical (PEC) immunoassay. The specific immune-recognition behaviour can bring the GRD-GOD labelled antigen into the antibody immobilized CdS:Mn/TiO2 interface and dramatically enhance the photocurrent response via a dual signal amplification strategy. First, graphene nanodisks with a strong electron transfer capacity can improve the conductivity of both the insulating protein layers and the CdS:Mn/TiO2 matrix, thus facilitating the regeneration of trapped carriers and hot electrons in the CdS:Mn QD films and enhancing the PEC performance...
November 15, 2017: Analyst
https://www.readbyqxmd.com/read/29140359/ns-duration-transient-bragg-gratings-in-silica-fibers
#14
Avishay Shamir, Aviran Halstuch, Yonatan Sivan, Amiel A Ishaaya
We demonstrate, for the first time to our knowledge, fast all-optical switching in standard silica fibers, based on a transient Bragg grating. The grating is implemented in the fiber using an immunization photo-pretreatment process, followed by side illumination with femtosecond laser pulses through a suitable phase mask. Each pulse is nonlinearly absorbed, creating a thermal grating that is washed out by thermal diffusion. Reflections measured from such gratings are characterized by a very fast rise time, nanoseconds duration, and a high extinction ratio...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29140272/an-investigation-of-polyoxometalate-hybrid-materials-as-patternable-dielectrics-and-lithographic-resists
#15
Brandon Hardie, Mark Roll
Polyoxometalate (POM) hybrid materials have shown potential as spin-coatable, patternable dielectric thin-films and components for lithographic resists. In particular, the octamolybdate cluster has been shown to possess good spin-coating properties and the patterning capabilities of hybrid octamolybdate thin-films were explored using a combination of broadband UV and electron beam lithography (EBL) techiniques. Dielectric properties of these films were determined by ellipsometry, and octamolybdate clusters were subsequently investigated as negative resists in various blends for potential uses in next-generation photolithography, where contrast, sensitivity, and line edge roughness characteristics were determined...
November 15, 2017: Materials
https://www.readbyqxmd.com/read/29139597/time-resolved-interception-of-multiple-charge-accumulation-in-a-sensitizer-acceptor-dyad
#16
Stéphanie Mendes Marinho, Minh-Huong Ha-Thi, Van-Thai Pham, Annamaria Quaranta, Thomas Pino, Christophe Lefumeux, Thierry Chamaillé, Winfried Leibl, Ally Aukauloo
Biomimetic models that contain elements of photosynthesis are fundamental in the development of synthetic systems that can use sunlight to produce fuel. The critical task consists of running several rounds of light-induced charge separation, which is required to accumulate enough redox equivalents at the catalytic sites for the target chemistry to occur. Long-lived first charge-separated state and distinct electronic signatures for the sequential charge accumulated species are essential features to be able to track these events on a spectroscopic ground...
November 15, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29139489/online-monitoring-of-a-photocatalytic-reaction-by-real-time-high-resolution-flownmr-spectroscopy
#17
Andrew M R Hall, Rachael Broomfield-Tagg, Matthew Camilleri, David R Carbery, Anna Codina, David T E Whittaker, Steven Coombes, John P Lowe, Ulrich Hintermair
We demonstrate how FlowNMR spectroscopy can readily be applied to investigate photochemical reactions that require sustained input of light and air to yield mechanistic insight under realistic conditions. The Eosin Y mediated photo-oxidation of N-allylbenzylamine is shown to produce imines as primary reaction products from which undesired aldehydes form after longer reaction times. Facile variation of reaction conditions during the reaction in flow allows for probe experiments that give information about the mode of action of the photocatalyst...
November 15, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29139183/photo-induced-pedalo-type-motion-in-an-azodicarboxamide-based-molecular-switch
#18
Saeed Amirjalayer, Alberto Martinez-Cuezva, Jose Berná, Sander Woutersen, Wybren Jan Buma
Well-defined structural changes of molecular units that can be triggered by light are crucial for the development of photoactive functional materials. Here we report on a novel switch that has azodicarboxamide as its photo triggerable element. Time-resolved UV-pump/IR probe spectroscopy in combination with quantum chemical calculations shows that the azodicarboxamide functionality -in contrast to other azo-based chromophores- does not undergo trans-cis photoisomerization. Instead, a photo-induced pedalo-type motion occurs, which due to its volume-conserving properties enables to design functional molecular systems with controllable motion in a confined space...
November 15, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29139000/effect-of-light-polarization-on-the-efficiency-of-photodynamic-therapy-of-basal-cell-carcinomas-an-in-vitro-cellular-study
#19
M JalalKamali, S N Nematollahi-Mahani, M Shojaei, A Shamsoddini, N Arabpour
In an in vitro study, the effect of light polarization on the efficiency of 5-aminolaevulinic acid (ALA) photodynamic therapy (PDT) of basal cell carcinoma (BCC) was investigated. Three states of light polarization (non-polarized, linearly polarized, and circularly polarized) were considered. Cells were exposed to green (532 pm 20 nm) irradiation from light emitting diodes. Cell survival was measured by the colorimetric assay (WST-1) and Trypan blue staining. The colorimetric assay showed a pronounced decrease in the cell viability (up to 30%) using polarized light compared to the non-polarized one in the wavelength region used...
November 15, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29138251/mitochondrial-inner-membrane-protease-yme1-degrades-outer-membrane-proteins-tom22-and-om45
#20
Xi Wu, Lanlan Li, Hui Jiang
Mitochondria are double-membraned organelles playing essential metabolic and signaling functions. The mitochondrial proteome is under surveillance by two proteolysis systems: the ubiquitin-proteasome system degrades mitochondrial outer-membrane (MOM) proteins, and the AAA proteases maintain the proteostasis of intramitochondrial compartments. We previously identified a Doa1-Cdc48(-Ufd1-Npl4) complex that retrogradely translocates ubiquitinated MOM proteins to the cytoplasm for degradation. In this study, we report the unexpected identification of MOM proteins whose degradation requires the Yme1(-Mgr1-Mgr3)i-AAA protease complex in mitochondrial inner membrane...
November 14, 2017: Journal of Cell Biology
keyword
keyword
101404
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"