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https://www.readbyqxmd.com/read/28917920/one-step-hydrothermal-synthesis-of-fluorescent-nanocrystalline-cellulose-carbon-dot-hydrogels
#1
Wei Li, Sichun Wang, Ying Li, Chunhui Ma, Zhanhua Huang, Chunsheng Wang, Jian Li, Zhijun Chen, Shouxin Liu
Fluorescent nanocrystalline cellulose/carbon dots (NCC/CDs) hydrogels were successfully prepared by a facile one-step green hydrothermal carbonization process. The properties of NCC/CDs hydrogels prepared at different temperatures were investigated by fluorescence spectroscopy, transmission electron microscopy, nuclear magnetic resonance spectroscopy, X-ray diffraction, and thermogravimetric analysis. NCC/CDs hydrogels with high crystallinity, high thermal stability, and excellent fluorescence properties can be obtained by controlling the hydrothermal treatment temperature...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917752/facilely-self-assembled-magnetic-nanoparticles-aptamer-carbon-dots-nanocomposites-for-highly-sensitive-up-conversion-fluorescence-turn-on-detection-of-tetrodotoxin
#2
Hui Jin, Rijun Gui, Jie Sun, Yanfeng Wang
In this work, magnetic Fe3O4 nanoparticles (NPs) were modified with aptamer of tetrodotoxin (TTX) to form Fe3O4/aptamer complex. The self-assembling of carbon dots (CDs) and the aptamer generated Fe3O4/aptamer/CDs nanocomposites. The nanocomposites exhibited down-conversion fluorescence and up-conversion fluorescence (UCF) emissions simultaneously. When excited at a wavelength of 780nm, the UCF (peaked at 475nm) of nanocomposites increased regularly with the increase of TTX concentration [TTX]. In the [TTX] range from 0...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917397/evaluation-of-postoperative-toric-intraocular-lens-alignment-with-anterior-segment-optical-coherence-tomography
#3
Andrea Lucisano, Marco Ferrise, Marco Balestrieri, Massimo Busin, Vincenzo Scorcia
We describe the use of a simple tool to evaluate the postoperative alignment of toric intraocular lenses (IOLs). The entire anterior segment is scanned using anterior segment optical coherence tomography and analyzed with an internal dedicated tool. A topographic map is displayed along with an anterior segment image, including a linear axis marker centered on the corneal apex. The marker can be rotated until it is aligned with the line connecting the IOL marking dots, precisely reproducing the IOL astigmatic axis, which is measured in angle degrees...
August 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28916035/sensitive-prostate-specific-antigen-quantification-using-dihydrolipoic-acid-surface-functionalized-phosphorescent-quantum-dots
#4
Marta García-Cortés, María Teresa Fernández-Argüelles, José M Costa-Fernández, Alfredo Sanz-Medel
Herein, high-quality Mn-doped ZnS quantum dots (QDs) have been synthesized using a facile approach directly in aqueous media. The surface of the obtained QDs was further modified by cap-exchange of the native cysteine shell with dihydrolipoic acid (DHLA) ligands resulting in nanocrystals with high water-stability having an intense phosphorescent signal. Covalent bioconjugation of the DHLA-coated nanoparticles with an anti-IgG antibody was then carried out. Interestingly the QD immunoprobe (QD-labelled antibodies) maintained an intense phosphorescence emission, without any significant spectral-shift (as compared to the free QDs)...
September 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28915904/tiga-cub-manualised-psychoanalytic-child-psychotherapy-versus-treatment-as-usual-for-children-aged-5-11-years-with-treatment-resistant-conduct-disorders-and-their-primary-carers-study-protocol-for-a-randomised-controlled-feasibility-trial
#5
Elizabeth Edginton, Rebecca Walwyn, Kayleigh Burton, Robert Cicero, Liz Graham, Sadie Reed, Sandy Tubeuf, Maureen Twiddy, Alex Wright-Hughes, Lynda Ellis, Dot Evans, Tom Hughes, Nick Midgley, Paul Wallis, David Cottrell
BACKGROUND: The National Institute for Health and Care Excellence (NICE) recommends evidence-based parenting programmes as a first-line intervention for conduct disorders (CD) in children aged 5-11 years. As these are not effective in 25-33% of cases, NICE has requested research into second-line interventions. Child and Adolescent Psychotherapists (CAPTs) address highly complex problems where first-line treatments have failed and there have been small-scale studies of Psychoanalytic Child Psychotherapy (PCP) for CD...
September 15, 2017: Trials
https://www.readbyqxmd.com/read/28915491/green-synthesis-of-carbon-dots-originated-from-lycii-fructus-for-effective-fluorescent-sensing-of-ferric-ion-and-multicolor-cell-imaging
#6
Xiaohan Sun, Jiang He, Shenghong Yang, Mingda Zheng, Yingying Wang, Shuang Ma, Haipeng Zheng
Green, economical and effective method was developed for synthesis of fluorescent carbon dots (CDs), using one-pot hydrothermal treatment of Lycii Fructus. Optical and structural properties of the CDs have been extensively studied by UV-visible and fluorescence spectroscopic, x-ray diffraction (XRD) techniques, transmission electron microscopy (TEM) and high resolution TEM (HRTEM). Surface functionality and composition of CDs has been illustrated by Fourier transform infrared spectroscopy (FTIR), x-ray photoelectron spectroscopy (XPS) spectra and elemental analysis...
September 1, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28915384/supramolecular-nano-sniffers-for-ultrasensitive-detection-of-formaldehyde
#7
Uchangi Satyaprasad Akshath, Praveena Bhatt
Supramolecular nanoparticle hybrids for biosensing of analytes have been a major focus due to their tunable optical and surface properties. Quantum dots-Gold nanoparticle (QDs-GNP) based FRET probes involving turn on/off principles have gained immense interest due to their specificity and sensitivity. Recent focus is on applying these supramolecular hybrids for enzyme operated biosensors that can specifically turn-on fluorescence induced by co-factor or product formed from enzymatic reaction. The present study focuses on locking and unlocking the interaction between QD-GNP pair leading to differential fluorescent properties...
September 9, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28915317/the-theoretical-reliability-of-pcr-based-fish-viral-diagnostic-methods-is-critically-affected-when-they-are-applied-to-fish-populations-with-low-prevalence-and-virus-loads
#8
C P Dopazo, P Moreno, J G Olveira, J J Borrego
AIMS: The reliability of PCR techniques is an important issue in viral diagnosis, and it is even crucial when they must be applied for detection of viruses in asymptomatic carriers. The problems will arise when the aim is to study fish wild populations, where the viral loads and prevalence values are extremely low. We have evaluated several PCR procedures employed by two laboratories for monitoring fish captured in several oceanographic campaigns performed in the Gulf of Cádiz. METHODS AND RESULTS: To evaluate the reliability of different diagnostics test used, we have re-analyzed fish samples that had been previously subjected to diagnosis for a surveillance of viruses performed in 2010-2011 in wild fish populations...
September 15, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28915270/the-single-cyclic-nucleotide-specific-phosphodiesterase-of-the-intestinal-parasite-giardia-lamblia-represents-a-potential-drug-target
#9
Stefan Kunz, Vreni Balmer, Geert Jan Sterk, Michael P Pollastri, Rob Leurs, Norbert Müller, Andrew Hemphill, Cornelia Spycher
BACKGROUND: Giardiasis is an intestinal infection correlated with poverty and poor drinking water quality, and treatment options are limited. According to the Center for Disease Control and Prevention, Giardia infections afflict nearly 33% of people in developing countries, and 2% of the adult population in the developed world. This study describes the single cyclic nucleotide-specific phosphodiesterase (PDE) of G. lamblia and assesses PDE inhibitors as a new generation of anti-giardial drugs...
September 15, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28915011/highly-controllable-and-efficient-synthesis-of-mixed-halide-cspbx3-x-cl-br-i-perovskite-qds-toward-the-tunability-of-entire-visible-light
#10
Ying Su, Xuejiao Chen, Wenyu Ji, Qinghui Zeng, Zhongyuan Ren, Zisheng Su, Lei Liu
CsPbX3 (X = Cl, Br, I) perovskite quantum dots (PQDs) have been intensively investigated on photoelectric devices due to their superior optical properties. To date, the stability of CsPbX3 PQDs is still an open challenge. The previous mixed-halide CsPbX3 PQDs were generally obtained via the anion-exchange method at 40 °C. Here, the single- and mixed-halide CsPbX3 PQDs are synthesized at high temperature via the hot injection technique. The surface ligands could thus be strongly coordinated onto the surface of the PQDs, which dramatically improve the optical properties of the PQDs...
September 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28915009/electron-stability-and-negative-tetron-luminescence-in-free-standing-colloidal-n-type-cdse-cds-quantum-dots
#11
Kimberly H Hartstein, Christian S Erickson, Emily Y Tsui, Arianna Marchioro, Daniel R Gamelin
We examine the effects of CdS shell growth on photochemical reduction of colloidal CdSe quantum dots (QDs), and describe the spectroscopic properties of the resulting n-type CdSe/CdS QDs. CdS shell growth greatly slows electron trapping. Because of this improvement, complete two-electron occupancy of the 1Se conduction-band orbital is achieved in CdSe/CdS QDs and found to be much more stable than in past experiments. Simultaneous photoluminescence at two different energies is now observed from QDs possessing two excess conduction-band electrons, reflecting competing recombination of discretized 1Se and 1Pe conduction-band electrons within photogenerated four-carrier negative tetrons (three electrons and one hole)...
September 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28915002/microrna-catalyzed-cancer-therapeutics-based-on-dna-programmed-nanoparticle-complex
#12
Xucheng Luo, Zhi Li, Ganglin Wang, Xuewen He, Xiaoqin Shen, Quanhong Sun, Li Wang, Renye Yue, Nan Ma
The use of cancer-relevant microRNA molecules as endogenous drug release stimuli is promising for personalized cancer treatment yet remains a great challenge because of their low abundance. Herein, we report a new type of microRNA-catalyzed drug release system based on DNA-programmed gold nanoparticle (GNP)-quantum dot (QD) complex. We show that a trace amount of miRNA-21 molecules could specifically catalyze the disassembly of doxorubicin (Dox)-loaded GNP-QDs complex through entropy driven process, during which the Dox-intercalating sites are destructed for drug release...
September 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28914922/effect-of-nitrogen-doping-on-the-photoluminescence-intensity-of-graphene-quantum-dots
#13
Svette Reina Merden Santiago, Yee Ann Wong, Tzu-Neng Lin, Chiao-Hsin Chang, Chi-Tsu Yuan, Ji-Lin Shen
We have developed a facile, fast, and one-step synthetic method to prepare graphene quantum dots (GQDs) simultaneously with nitrogen (N) doping via pulsed laser ablation. The N-doped GQDs (N-GQDs) with an average size around 3 nm and an N/C atomic ratio of 33% have been obtained. The N-GQDs emit blue photoluminescence (PL), where the PL intensity enhances as the N doping increases. The PL enhancement for the N-GQDs with a factor as high as 25 has been achieved as compared to GQDs. The origin of the PL enhancement in GQDs after N doping is attributed to the increased densities of pyridinic and graphitic N...
September 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28914481/boron-and-nitrogen-co-doped-carbon-dots-as-a-sensitive-fluorescent-probe-for-the-detection-of-curcumin
#14
Wei Bian, Xuan Wang, Yakun Wang, Haifen Yang, Jialin Huang, Zongwei Cai, Martin M F Choi
In this present study, a fluorescent probe was developed to detect curcumin, which is derived from the rhizomes of the turmeric. We used a simple and economical way to synthesize boron and nitrogen co-doped carbon dots (BNCDs) by microwave heating. The maximum emission wavelength of the BNCDs was 450 nm at an excitation wavelength of 360 nm. The as-prepared BNCDs were characterized by multiple analytical techniques such as transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and infrared spectroscopy...
September 15, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28912561/luminophore-configuration-and-concentration-dependent-optoelectronic-characteristics-of-a-quantum-dot-embedded-dna-hybrid-thin-film
#15
Velu Arasu, Sreekantha Reddy Dugasani, Mallikarjuna Reddy Kesama, Ho Kyoon Chung, Sung Ha Park
To be useful in optoelectronic devices and sensors, a platform comprising stable fluorescence materials is essential. Here we constructed quantum dots (QDs) embedded DNA thin films which aims for stable fluorescence through the stabilization of QDs in the high aspect ratio salmon DNA (SDNA) matrix. Also for maximum luminescence, different concentration and configurations of core- and core/alloy/shell-type QDs were embedded within SDNA. The QD-SDNA thin films were constructed by drop-casting and investigated their optoelectronic properties...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28912457/photoelectrolysis-using-type-ii-semiconductor-heterojunctions
#16
S Harrison, M Hayne
The solar-powered production of hydrogen for use as a renewable fuel is highly desirable for the world's future energy infrastructure. However, difficulties in achieving reasonable efficiencies, and thus cost-effectiveness, have hampered significant research progress. Here we propose the use of semiconductor nanostructures to create a type-II heterojunction at the semiconductor-water interface in a photoelectrochemical cell (PEC) and theoretically investigate it as a method of increasing the maximum photovoltage such a cell can generate under illumination, with the aim of increasing the overall cell efficiency...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28912155/visual-motion-discrimination-by-propagating-patterns-in-primate-cerebral-cortex
#17
Rory Townsend, Selina S Solomon, Paul R Martin, Samuel G Solomon, Pulin Gong
Visual stimuli can evoke waves of neural activity that propagate across the surface of visual cortical areas. The relevance of these waves for visual processing is unknown. Here we measured the phase and amplitude of local field potentials (LFPs) in electrode array recordings from motion-processing medial temporal area (MT) of anesthetized male marmosets. Animals viewed grating or dot-field stimuli drifting in different directions. We found that on individual trials, the direction of LFP wave propagation is sensitive to the direction of stimulus motion...
September 14, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28910673/a-randomized-controlled-evaluation-of-a-secondary-school-mindfulness-program-for-early-adolescents-do-we-have-the-recipe-right-yet
#18
Catherine Johnson, Christine Burke, Sally Brinkman, Tracey Wade
OBJECTIVE: Mindfulness is being promoted in schools as a prevention program despite a current small evidence base. The aim of this research was to conduct a rigorous evaluation of the .b ("Dot be") mindfulness curriculum, with or without parental involvement, compared to a control condition. METHOD: In a randomized controlled design, students (Mage 13.44, SD 0.33; 45.4% female) across a broad range of socioeconomic indicators received the nine lesson curriculum delivered by an external facilitator with (N = 191) or without (N = 186) parental involvement, or were allocated to a usual curriculum control group (N = 178)...
September 6, 2017: Behaviour Research and Therapy
https://www.readbyqxmd.com/read/28910411/molecular-population-genetics-of-the-polycomb-genes-in-drosophila-subobscura
#19
Juan M Calvo-Martín, Montserrat Papaceit, Carmen Segarra
Polycomb group (PcG) proteins are important regulatory factors that modulate the chromatin state. They form protein complexes that repress gene expression by the introduction of posttranslational histone modifications. The study of PcG proteins divergence in Drosophila revealed signals of coevolution among them and an acceleration of the nonsynonymous evolutionary rate in the lineage ancestral to the obscura group species, mainly in subunits of the Pcl-PRC2 complex. Herein, we have studied the nucleotide polymorphism of PcG genes in a natural population of D...
2017: PloS One
https://www.readbyqxmd.com/read/28910389/cross-species-conservation-of-episome-maintenance-provides-a-basis-for-in-vivo-investigation-of-kaposi-s-sarcoma-herpesvirus-lana
#20
Aline C Habison, Marta Pires de Miranda, Chantal Beauchemin, Min Tan, Sofia A Cerqueira, Bruno Correia, Rajesh Ponnusamy, Edward J Usherwood, Colin E McVey, J Pedro Simas, Kenneth M Kaye
Many pathogens, including Kaposi's sarcoma herpesvirus (KSHV), lack tractable small animal models. KSHV persists as a multi-copy, nuclear episome in latently infected cells. KSHV latency-associated nuclear antigen (kLANA) binds viral terminal repeat (kTR) DNA to mediate episome persistence. Model pathogen murine gammaherpesvirus 68 (MHV68) mLANA acts analogously on mTR DNA. kLANA and mLANA differ substantially in size and kTR and mTR show little sequence conservation. Here, we find kLANA and mLANA act reciprocally to mediate episome persistence of TR DNA...
September 2017: PLoS Pathogens
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