keyword
MENU ▼
Read by QxMD icon Read
search

Photo sensitivity

keyword
https://www.readbyqxmd.com/read/28227363/3d-gabor-wavelet-based-vessel-filtering-of-photoacoustic-images
#1
Israr Ul Haq, Ryo Nagoaka, Takahiro Makino, Takuya Tabata, Yoshifumi Saijo, Israr Ul Haq, Ryo Nagoaka, Takahiro Makino, Takuya Tabata, Yoshifumi Saijo, Ryo Nagoaka, Yoshifumi Saijo, Takahiro Makino, Takuya Tabata
Filtering and segmentation of vasculature is an important issue in medical imaging. The visualization of vasculature is crucial for the early diagnosis and therapy in numerous medical applications. This paper investigates the use of Gabor wavelet to enhance the effect of vasculature while eliminating the noise due to size, sensitivity and aperture of the detector in 3D Optical Resolution Photoacoustic Microscopy (OR-PAM). A detailed multi-scale analysis of wavelet filtering and Hessian based method is analyzed for extracting vessels of different sizes since the blood vessels usually vary with in a range of radii...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225115/solvothermal-assisted-synthesis-of-self-assembling-tio2-nanorods-on-large-graphitic-carbon-nitride-sheets-with-their-anti-recombination-in-the-photocatalytic-removal-of-cr-vi-and-rhodamine-b-under-visible-light-irradiation
#2
Dingze Lu, Pengfei Fang, Wenhui Wu, Junqian Ding, Lulu Jiang, Xiaona Zhao, Chunhe Li, Minchen Yang, Yuanzhi Li, Dahai Wang
TiO2-based nanorods (TNRs) were self-assembled on large graphitic carbon nitride (g-C3N4) sheets via the solvothermal-assisted route. The results demonstrated that the effective anchoring of TNRs (a side length of ca. 200-300 nm) was highly dispersed on the surface of whole g-C3N4 sheets. The shift in the Ti 2p XPS core level spectrum indicated an increase in the net positive charge of the Ti ions, ensuring the formation of an interface between TNRs and g-C3N4. The charge transferred from g-C3N4 sheets to TNRs effectively prevented the recombination of excited charges, which is consistent with the significant quenching of PL...
February 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28220178/a-photo-degradable-supramolecular-hydrogel-for-selective-delivery-of-microrna-into-3d-cultured-cells
#3
Zhengquan Zhou, Qikun Yi, Tingting Xia, Wencui Yin, Adnan A Kadi, Jinbo Li, Yan Zhang
Multi-functional supramolecular hydrogels have emerged as smart biomaterials for diverse biomedical applications. Here we report a multi-functional supramolecular hydrogel formed by the conjugate of the bioactive GRGDS peptide with biaryltetrazole that is the substrate of photo-click reaction. The hydrogel was used as a biocompatible matrix to encapsulate live cells for 3D culture. The presence of the RGD epitope in the hydrogelator enhanced the interaction of the nanofiber with integrin over-expressing cells, which resulted in the selective enhancement in the miRNA delivery into the encapsulated U87 cells...
February 21, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28217874/fabricating-triple-sensitive-polymer-nano-aggregates-via-an-aqueous-iminoboronate-multicomponent-reaction
#4
Yanning Liu, Guo Li, Jiangang Chen, Zhaotie Liu, Zhongwen Liu, Jinqiang Jiang
A triple-sensitive polymer of poly(ethylene glycol)-iminoboronate nitrobenzyl ethanediol chelate (PEG-INEC) is efficiently fabricated via the convenient aqueous iminoboronate multi-component reaction (MCR) of methoxypolyethylene glycol amine (mPEG-NH2 ), 2-formylphenylboronic acid (FPBA), and bis(2-nitrophenyl) ethanediol (BNPE, a photo-cleavable nitrobenzyl alcohol derivate). The aqueous MCR synthetic procedure is followed using (1) H NMR and turbidity analysis. It is shown that polymer nano-aggregates of PEG-INEC in aqueous solution can be dissociated through the stimuli responsive reactions of the hydrophobic iminoboronate nitrobenzyl ethanediol chelates (INECs) when exposed to UV light, acid, and H2 O2 , respectively...
February 20, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28213514/peripheral-membrane-interactions-boost-the-engagement-by-an-anti-hiv-1-broadly-neutralizing-antibody
#5
Edurne Rujas, José M M Caaveiro, Sara Insausti, Miguel García-Porras, Kouhei Tsumoto, José L Nieva
The 4E10 antibody displays an extreme breadth of HIV-1 neutralization and therefore constitutes a suitable model system for structure- guided vaccine design and immunotherapeutics against AIDS. In this regard, the relevance of auto- reactivity with membrane lipids for the biological function of this antibody is still a subject of controversy. To address this dispute, herein we have compared the membrane-partitioning ability of the 4E10 antibody and several of its variants, which were mutated at the region of the paratope surface in contact with the membrane-interface...
February 17, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28197891/simple-generalisation-of-a-mesophyll-resistance-model-for-various-intracellular-arrangements-of-chloroplasts-and-mitochondria-in-c3-leaves
#6
Xinyou Yin, Paul C Struik
The classical definition of mesophyll conductance (g m) represents an apparent parameter (g m,app) as it places (photo)respired CO2 at the same compartment where the carboxylation by Rubisco takes place. Recently, Tholen and co-workers developed a framework, in which g m better describes a physical diffusional parameter (g m,dif). They partitioned mesophyll resistance (r m,dif = 1/g m,dif) into two components, cell wall and plasmalemma resistance (r wp) and chloroplast resistance (r ch), and showed that g m,app is sensitive to the ratio of photorespiratory (F) and respiratory (R d) CO2 release to net CO2 uptake (A): g m,app = g m,dif/[1 + ω(F + R d)/A], where ω is the fraction of r ch in r m,dif...
February 14, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28192285/real-time-detection-of-fast-and-thermal-neutrons-in-radiotherapy-with-cmos-sensors
#7
Nicolas Arbor, Stephane Higueret, Halima Elazhar, Rodolphe Combe, Philippe Meyer, Nicolas Dehaynin, Florence Taupin, Daniel Husson
The peripheral dose distribution is a growing concern for the improvement of new external radiation modalities. Secondary particles, especially photo-neutrons produced by the accelerator, irradiate the patient more than tens of centimeters away from the tumor volume. However the out-of-field dose is still not estimated accurately by the treatment planning softwares. This study demonstrates the possibility of using a specially designed CMOS sensor for fast and thermal neutron monitoring in radiotherapy. The 14 microns-thick sensitive layer and the integrated electronic chain of the CMOS are particularly suitable for real-time measurements in γ/n mixed fields...
March 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28181697/chronic-toxicity-of-azoxystrobin-to-freshwater-amphipods-midges-cladocerans-and-mussels-in-water-only-exposures
#8
James L Kunz, Chris G Ingersoll, Kelly L Smalling, Adria A Elskus, Kathryn M Kuivila
Understanding the effects of fungicides on non-target organisms at realistic concentrations and exposure durations is vital for determining potential impacts on aquatic ecosystems. Environmental concentrations of the fungicide azoxystrobin have been reported up to 4.6µg/L in the United States and 30 µg/L in Europe. The objective of the present study was to evaluate the chronic toxicity of azoxystrobin in water-only exposures with an amphipod (Hyalella azteca; 42-d exposure), a midge (Chironomus dilutus; 50-d exposure), a cladoceran (Ceriodaphnia dubia; 7-d exposure), and a unionid mussel (Lampsilis siliquoidea; 28-d exposure) at environmentally relevant concentrations...
February 9, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28178638/fast-photoelectro-reduction-of-cr-vi-over-mos2-tio2-nanotubes-on-ti-wire
#9
Lixia Yang, Xutong Zheng, Ming Liu, Shenglian Luo, Yan Luo, Guifa Li
A stable MoS2 nanosheets@TiO2 NTAs composite was prepared via a simple hydrothermal process. Few-layer MoS2 nanosheets distributed on the TiO2 nanotube top surface and the inner walls rather than filling in the tubes, allowing abundant tubular channels open to environment and benefiting for efficient mass transport. Photocatalytic (PE) and photoelectrocatalytic (PEC) performance of the composite were evaluated on Cr(VI) reduction, with variable low molecule weight organic acids (LOAs) added as sacrificial electron donor to form a charge-transfer-complex (CTC) between LOAs and TiO2/MoS2, which is sensitive to the visible light illumination and could induce the photo-reduction of Cr(VI) and photo-oxidation of LOAs...
January 30, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28176875/millitesla-magnetic-field-effects-on-the-photocycle-of-an-animal-cryptochrome
#10
Dean M W Sheppard, Jing Li, Kevin B Henbest, Simon R T Neil, Kiminori Maeda, Jonathan Storey, Erik Schleicher, Till Biskup, Ryan Rodriguez, Stefan Weber, P J Hore, Christiane R Timmel, Stuart R Mackenzie
Drosophila have been used as model organisms to explore both the biophysical mechanisms of animal magnetoreception and the possibility that weak, low-frequency anthropogenic electromagnetic fields may have biological consequences. In both cases, the presumed receptor is cryptochrome, a protein thought to be responsible for magnetic compass sensing in migratory birds and a variety of magnetic behavioural responses in insects. Here, we demonstrate that photo-induced electron transfer reactions in Drosophila melanogaster cryptochrome are indeed influenced by magnetic fields of a few millitesla...
February 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28176284/direct-observation-of-high-photoresponsivity-in-pure-graphene-photodetectors
#11
Yanping Liu, Qinglin Xia, Jun He, Zongwen Liu
Ultrafast and broad spectral bandwidth photodetectors are desirable attributable to their unique bandstructures. Photodetectors based on graphene have great potential due to graphene's outstanding optical and electrical properties. However, the highest reported values of the photoresponsivity of pure graphene are less than 10 mA/W at room temperature, which significantly limits its potential applications. Here, we report a photoresponsivity of 32 A/W in pure monolayer graphene photodetectors, an improvement of over one order of magnitude for functional graphene nanostructures (<3 A/W)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28167365/nitrogen-doped-graphene-quantum-dots-based-long-persistent-chemiluminescence-system-for-ascorbic-acid-imaging
#12
Hongjun Chen, Qin Wang, Qinpeng Shen, Xin Liu, Wang Li, Zhou Nie, Shouzhuo Yao
High photo-intensity and sluggish flight attenuation are important to highly sensitive chemluminescence imaging. Herein, we present a copper ion catalyzed long-persistent chemiluminescent imaging system of nitrogen-doped graphene quantum dots (NGQDs) for ascorbic acid detection in fruit. NGQDs as luminescent probe are fabricated, emitting out chemluminescence with the direct oxidation by H2O2. In addition, Cu(2+) ion enlarges over two order magnitudes of NGQDs CL intensity (214 times) due to its catalyzed Fenton-like reaction for H2O2 decomposition, and displaying unique specificity against other metal ions...
May 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28158953/immigrant-women-s-food-choices-in-pregnancy-perspectives-from-women-of-chinese-origin-in-canada
#13
Gina Marie Awoko Higginbottom, Helen Valianatos, Janki Shankar, Jalal Safipour, Christina Davey
OBJECTIVE: Following migration, pregnant immigrant women may encounter social, cultural, and economic challenges that negatively affect their food choices and subsequent health outcomes. Culturally appropriate health care is crucial during the perinatal period to ensure the health of immigrant mothers and their children. This project aims to explore and understand how the health beliefs and practices of Chinese immigrant women affect their food choices during the perinatal period. DESIGN: This qualitative study used the methodology of focused ethnography...
February 3, 2017: Ethnicity & Health
https://www.readbyqxmd.com/read/28155150/the-use-of-lectin-histochemistry-for-detecting-apoptotic-cells-in-the-seminiferous-epithelium
#14
Vicente Seco-Rovira, Ester Beltrán-Frutos, Jesús Hernández-Martínez, Concepción Ferrer, Luis Miguel Pastor
Lectin histochemistry is commonly used to characterize the pattern of glycoconjugates in cells and tissues. Recent studies show that alterations in these glycoconjugates are associated with the entry of cells into apoptosis. A widely used technique for the detection of apoptotic cell death is TUNEL. In this chapter, we study the sensitivity of both techniques to identify apoptotic cells in the testis of photo-inhibited Syrian hamster.
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28153299/nanoparticle-based-paper-sensor-for-thiols-evaluation-in-human-skin
#15
M Markina, N Stozhko, V Krylov, M Vidrevich, Kh Brainina
A new sensitive non-invasive gold nanoparticle-based sensor that enables to detect thiols in the human skin has been developed. The detection procedure implied the assessment of the color change of a paper sensor resulting from aggregation of gold nanoparticles caused by thiols. The ratio of the intensity of the photo image blue channel vs the red one (in units of RGB coloration) served as analytical response. The main thiol in the skin is glutathione, therefore, it was used as model biothiol and spiking substance...
April 1, 2017: Talanta
https://www.readbyqxmd.com/read/28150202/detecting-sonolysis-of-polyethylene-glycol-upon-functionalizing-carbon-nanotubes
#16
Ruhung Wang, Vasanth S Murali, Rockford Draper
Polyethylene glycol (PEG) and related polymers are often used in the solubilization and noncovalent functionalization of carbon nanomaterials by sonication. For example, carbon nanotubes are frequently sonicated with PEG-containing surfactants of the Pluronic(®) series or phospholipid-PEG polymers to noncovalently functionalize the nanotubes. However, PEG is very sensitive to degradation upon sonication and the degradation products can be toxic to mammalian cells and to organisms such as zebrafish embryos...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28145410/photo-induced-oxidant-free-oxidative-c-h-n-h-cross-coupling-between-arenes-and-azoles
#17
Linbin Niu, Hong Yi, Shengchun Wang, Tianyi Liu, Jiamei Liu, Aiwen Lei
Direct cross-coupling between simple arenes and heterocyclic amines under mild conditions is undoubtedly important for C-N bonds construction. Selective C(sp(2))-H amination is more valuable. Herein we show a selective C(sp(2))-H amination of arenes (alkyl-substituted benzenes, biphenyl and anisole derivatives) accompanied by hydrogen evolution by using heterocyclic azoles as nitrogen sources. The reaction is selective for C(sp(2))-H bonds, providing a mild route to N-arylazoles. The KIE (kinetic isotope effect) experiment reveals the cleavage of C-H bond is not involved in the rate-determining step...
February 1, 2017: Nature Communications
https://www.readbyqxmd.com/read/28143528/validation-of-an-ipad-activity-to-measure-preschool-children-s-food-and-physical-activity-knowledge-and-preferences
#18
Nicola Wiseman, Neil Harris, Martin Downes
BACKGROUND: Preschool children's knowledge of, and preference for food and physical activity play an important role in the development of lifestyle behaviors throughout childhood. Valid and reliable instruments that are interactive and appealing to preschool children are needed, to obtain quality information in a way that actively engages children and encourages willing participation. The purpose of the current research is to assess the reliability and validity of an adapted computerized (iPad) version of the photo-pair food and exercise questionnaire (PPFEQ)...
February 1, 2017: International Journal of Behavioral Nutrition and Physical Activity
https://www.readbyqxmd.com/read/28141875/differences-in-illumination-estimation-in-thedress
#19
Matteo Toscani, Karl R Gegenfurtner, Katja Doerschner
We investigated whether people who report different colors for #thedress do so because they have different assumptions about the illumination in #thedress scene. We introduced a spherical illumination probe (Koenderink, Pont, van Doorn, Kappers, & Todd, 2007) into the original photograph, placed in fore-, or background of the scene and-for each location-let observers manipulate the probe's chromaticity, intensity and the direction of the illumination. Their task was to adjust the probe such that it would appear as a white sphere in the scene...
January 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28139780/specific-and-sensitive-detection-of-plasmodium-falciparum-lactate-dehydrogenase-by-dna-scaffolded-silver-nanoclusters-combined-with-an-aptamer
#20
Wei-Xian Wang, Yee-Wai Cheung, Roderick M Dirkzwager, Wai-Chung Wong, Julian A Tanner, Hong-Wei Li, Yuqing Wu
Innovative nanomaterials offer significant potential for diagnosis of severe diseases of the developing world such as malaria. Small sized silver nanoclusters have shown promise for diagnostics due to their intense fluorescence emission and photo-stabilities. Here, double-stranded DNA-scaffolded silver nanoclusters (AgNCs-dsDNA) were prepared to detect the established malaria biomarker, Plasmodium falciparum lactate dehydrogenase (PfLDH). Significant luminescence enhancement over a wide concentration range of PfLDH was demonstrated...
January 31, 2017: Analyst
keyword
keyword
33361
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"