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https://www.readbyqxmd.com/read/29116668/shaping-luminescent-properties-of-yb-3-and-ho-3-co-doped-upconverting-core-shell-%C3%AE-nayf4-nanoparticles-by-dopant-distribution-and-spacing
#1
Aleksandra Pilch, Christian Würth, Martin Kaiser, Dominika Wawrzyńczyk, Michalina Kurnatowska, Sebastian Arabasz, Katarzyna Prorok, Marek Samoć, Wiesław Strek, Ute Resch-Genger, Artur Bednarkiewicz
At the core of luminescence color and lifetime tuning of rare earth doped upconverting nanoparticles (UCNPs), is the understanding of the impact of the particle architecture for commonly used sensitizer (S) and activator (A) ions. In this respect, a series of core@shell NaYF4 UCNPs doped with Yb(3+) and Ho(3+) ions are presented here, where the same dopant concentrations are distributed in different particle architectures following the scheme: YbHo core and YbHo@…, …@YbHo, Yb@Ho, Ho@Yb, YbHo@Yb, and Yb@YbHo core-shell NPs...
November 8, 2017: Small
https://www.readbyqxmd.com/read/29083902/transfer-of-inorganic-capped-nanocrystals-into-aqueous-media
#2
Chris Guhrenz, Vladimir Sayevich, Florian Weigert, Eileen Hollinger, Annett Reichhelm, Ute Resch-Genger, Nikolai Gaponik, Alexander Eychmüller
We report on a novel and simple approach to surface ligand design of CdSe-based nanocrystals (NCs) with biocompatible, heterobifunctional polyethylene glycol (PEG) molecules. This method provides high transfer yields of the NCs into aqueous media with preservation of the narrow and symmetric emission bands of the initial organic-capped NCs regardless of their interior crystal structure and surface chemistry. The PEG-functionalized NCs show small sizes, high photoluminescence quantum yields of up to 75%, as well as impressive optical and colloidal stability...
November 2, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28937051/cardiac-lymphoma-after-the-hurricane
#3
Marijana Tadic, Sabine Haßfeld, Burket Pieske, Martin Genger
No abstract text is available yet for this article.
October 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28911234/mucopolysaccharidosis-iiib-sanfilippo-syndrome-b-in-a-commercial-emu-dromaius-novaehollandiae-flock
#4
Seiche C Genger, Keijiro Mizukami, Michael P Martin, Jeffrey R Applegate, H John Barnes, Urs Giger
Clinicopathological diagnosis of mucopolysaccharidosis type IIIB (MPS IIIB; Sanfilippo syndrome B), an inherited autosomal recessive lysosomal storage disease, as a cause of losses in a commercial emu flock and screening breeders using a mutation-specific DNA test are described. Between 2012 and 2015, ∼5-10 juvenile emus from a few weeks to several months of age developed progressive neurological signs and died while others in the flock remained healthy. Necropsy of two affected siblings revealed multiple sites of haemorrhage, cytoplasmic periodic acid-Schiff and Luxol fast blue-positive inclusions in neurons, and aggregates of foamy macrophages in visceral organs...
October 10, 2017: Avian Pathology: Journal of the W.V.P.A
https://www.readbyqxmd.com/read/28836042/coumarin-rhodamine-hybrids-novel-probes-for-the-optical-measurement-of-viscosity-and-polarity
#5
Norman Scholz, Amol Jadhav, Milind Shreykar, Thomas Behnke, Nithiya Nirmalananthan, Ute Resch-Genger, Nagaiyan Sekar
A comprehensive systematic study of absorption and fluorescence properties in solvents of varying viscosity and polarity of three novel and red-emitting coumarin-rhodamine hybrid derivatives with differences in the rigidity of their substituents is presented. This includes ethanol-polyethylene glycol, toluene-polyethylene glycol, and toluene-paraffin mixtures. Moreover, protonation-induced effects on the spectroscopic properties are studied. A viscosity-induced emission enhancement was observed for all coumarin-rhodamine hybrid derivatives...
November 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28791337/beam-profile-compensated-quantum-yield-measurements-of-upconverting-nanoparticles
#6
Monirehalsadat Mousavi, Björn Thomasson, Meng Li, Marco Kraft, Christian Würth, Ute Resch-Genger, Stefan Andersson-Engels
The quantum yield is a critically important parameter in the development of lanthanide-based upconverting nanoparticles (UCNPs) for use as novel contrast agents in biological imaging and optical reporters in assays. The present work focuses on the influence of the beam profile in measuring the quantum yield (ϕ) of nonscattering dispersions of nonlinear upconverting probes, by establishing a relation between ϕ and excitation light power density from a rate equation analysis. A resulting 60% correction in the measured ϕ due to the beam profile utilized for excitation underlines the significance of the beam profile in such measurements, and its impact when comparing results from different setups and groups across the world...
August 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28710516/perspectives-and-challenges-of-photon-upconversion-nanoparticles-part-i-routes-to-brighter-particles-and-quantitative-spectroscopic-studies
#7
REVIEW
Ute Resch-Genger, Hans H Gorris
Lanthanide-doped photon-upconversion nanoparticles (UCNPs) have been the focus of many research activities in materials and life sciences in the last 15 years because of their potential to convert light between different spectral regions and their unique photophysical properties. To fully exploit the application potential of these fascinating nanomaterials, a number of challenges have to be overcome, such as the low brightness, particularly of small UCNPs, and the reliable quantification of the excitation-power-density-dependent upconversion luminescence...
July 14, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28687881/perspectives-and-challenges-of-photon-upconversion-nanoparticles-part-ii-bioanalytical-applications
#8
REVIEW
Hans H Gorris, Ute Resch-Genger
In Part II of this review series on lanthanide-doped photon-upconversion nanoparticles (UCNPs), we present and critically discuss the performance and suitability of UCNPs as background-free luminescent reporters in bioimaging and bioanalytical applications. The preparation of a biocompatible nanoparticle surface is an integral step for all life - science-related applications. UCNPs have found their way into a large number of diagnostic platforms, homogeneous and heterogeneous assay formats, and sensor applications...
July 7, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28686275/power-dependent-upconversion-quantum-yield-of-nayf4-yb-3-er-3-nano-and-micrometer-sized-particles-measurements-and-simulations
#9
Martin Kaiser, Christian Würth, Marco Kraft, Iko Hyppänen, Tero Soukka, Ute Resch-Genger
Photophysical studies of nonlinear lanthanide-doped photon upconverting nanoparticles (UCNPs) increasingly used in biophotonics and photovoltaics require absolute measurements of the excitation power density (P)-dependent upconversion luminescence (UCL) and luminescence quantum yields (ΦUC) for quantifying the material performance, UCL deactivation pathways, and possible enhancement factors. We present here the P-dependence of the UCL spectra, ΦUC, and slope factors of the different emission bands of representative 25 nm-sized oleate-capped β-NaYF4:17% Yb(3+), 3% Er(3+) UCNPs dispersed in toluene and as powder as well as ΦUC of 3 μm-sized upconversion particles (UCμP), all measured with a newly designed integrating sphere setup, enabling controlled variation of P over four orders of magnitude...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28536004/multimodality-imaging-approach-in-the-diagnosis-of-chronic-myocarditis-with-preserved-left-ventricular-ejection-fraction-mcpef-the-role-of-2d-speckle-tracking-echocardiography
#10
Mario Kasner, Aleksandar Aleksandrov, Felicitas Escher, Nidal Al-Saadi, Markus Makowski, Frank Spillmann, Martin Genger, Heinz-Peter Schultheiss, Uwe Kühl, Burkert Pieske, Daniel A Morris, Michel Noutsias, Carsten Tschöpe
BACKGROUND: Up to one third of patients with chronic myocarditis (MC) have preserved left ventricular (LV) ejection fraction (MCpEF). The purpose of this study was to evaluate the role of adding 2D speckle-tracking echocardiography (STE) to cardiac magnetic resonance imaging (cMRI) in the diagnosis of patients with MCpEF. METHODS AND RESULTS: We analyzed 67 patients with suspected MCpEF who underwent endomyocardial biopsy (EMB). Thirty-two patients with confirmed chronic myocardial inflammation by EMB served as study group (MCpEF) and the remaining patients (n=35) served as control group...
September 15, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28470291/excitation-wavelength-dependence-of-the-photoluminescence-quantum-yield-and-decay-behavior-of-cdse-cds-quantum-dot-quantum-rods-with-different-aspect-ratios
#11
D Geißler, C Würth, C Wolter, H Weller, U Resch-Genger
The excitation wavelength (λexc) dependence of the photoluminescence (PL) quantum yield (ΦPL) and decay behavior (τPL) of a series of CdSe/CdS quantum dot/quantum rods (QDQRs), consisting of the same spherical CdSe core and rod-shaped CdS shells, with aspect ratios ranging from 2 to 20 was characterized. λexc between 400-565 nm were chosen to cover the first excitonic absorption band of the CdSe core material, the onset of absorption of the CdS shell, and the region of predominant shell absorption. A strong λexc dependence of relative and absolutely measured ΦPL and τPL was found particularly for the longer QDQRs with higher aspect ratios...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28430380/thermo-chromium-a-contactless-optical-molecular-thermometer
#12
Sven Otto, Norman Scholz, Thomas Behnke, Ute Resch-Genger, Katja Heinze
The unparalleled excited-state potential-energy landscape of the chromium(III)-based dye [1](3+) ([Cr(ddpd)2 ](3+) ; ddpd=N,N'-dimethyl-N,N'-dipyridin-2-yl-pyridin-2,6-diamine) enables a strong dual emission in the near infrared region. The temperature dependence of this dual emission allows the use of [1](3+) as an unprecedented molecular ratiometric thermometer in the 210-373 K temperature range in organic and in aqueous media. Incorporation of [1](3+) in biocompatible nanocarriers, such as 100 nm-sized polystyrene nanoparticles and solutol micelles, provides nanodimensional thermometers operating under physiological conditions...
April 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28405789/left-ventricular-strain-and-twisting-in-heart-failure-with-preserved-ejection-fraction-an-updated-review
#13
REVIEW
Marijana Tadic, Elisabeth Pieske-Kraigher, Cesare Cuspidi, Martin Genger, Daniel A Morris, Kun Zhang, Nina Alexandra Walther, Burket Pieske
Despite the high prevalence of the patients with heart failure with preserved ejection fraction (HFpEF), our knowledge about this entity, from diagnostic tools to therapeutic approach, is still not well established. The evaluation of patients with HFpEF is mainly based on echocardiography, as the most widely accepted tool in cardiac imaging. Identification of left ventricular (LV) diastolic dysfunction has long been considered as the only responsible for HFpEF, and its evaluation is still "sine qua non" of HFpEF diagnostics...
May 2017: Heart Failure Reviews
https://www.readbyqxmd.com/read/28325045/particle-size-dependent-f%C3%A3-rster-resonance-energy-transfer-from-upconversion-nanoparticles-to-organic-dyes
#14
Verena Muhr, Christian Würth, Marco Kraft, Markus Buchner, Antje J Baeumner, Ute Resch-Genger, Thomas Hirsch
Upconversion nanoparticles (UCNPs) are attractive candidates for energy transfer-based analytical applications. In contrast to classical donor-acceptor pairs, these particles contain many emitting lanthanide ions together with numerous acceptor dye molecules at different distances to each other, strongly depending on the particle diameter. UCNPs with precisely controlled sizes between 10 and 43 nm were prepared and functionalized with rose bengal and sulforhodamine B by a ligand-exchange procedure. Time-resolved studies of the upconversion luminescence of the UCNP donor revealed a considerable shortening of the donor lifetime as a clear hint for Förster resonance energy transfer (FRET)...
April 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28294258/excitation-power-dependent-population-pathways-and-absolute-quantum-yields-of-upconversion-nanoparticles-in-different-solvents
#15
C Würth, M Kaiser, S Wilhelm, B Grauel, T Hirsch, U Resch-Genger
The rational design of brighter upconversion nanoparticles (UCNPs) requires a better understanding of the radiationless deactivation pathways in these materials. Here, we demonstrate the potential of excitation power density (P)-dependent studies of upconversion (UC) luminescence intensities, slope factors, and absolute quantum yields (ΦUC) of popular β-NaYF4:20% Yb(3+),2% Er(3+) UCNPs of different surface chemistries in organic solvents, D2O, and water as a tool to gain deeper insight into the UC mechanism including population and deactivation pathways particularly of the red emission...
March 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/28255124/-influential-factors-of-iron-deficient-anemia-among-infants-aged-8-months-based-on-a-case-control-study
#16
Xiao Gao, Yan Yan, Shiting Xiang, Hongyan Li, Shan Tan, Qiong He, Tingting Sha, Shiping Liu, Guangyu Zeng, Qiang Yan
To study the status and influential factors of iron deficient anemia (IDA) among infants aged 8 months in Changsha City.
 Methods: A case-control study was performed in this research. The case group including 105 8-month-old infants definitely diagnosed as IDA based on standardized blood test. Four-times numbers of age- and genger-matched infants without IDA were selected as a control group. Chi-square test and conditional logistic regression was used to analyze the influential factors for IDA.
 Results: The incidence rate of IDA among infants aged 8 months in Changsha City was 14...
February 28, 2017: Zhong Nan da Xue Xue Bao. Yi Xue Ban, Journal of Central South University. Medical Sciences
https://www.readbyqxmd.com/read/28000894/berberine-affects-osteosarcoma-via-downregulating-the-caspase-1-il-1%C3%AE-signaling-axis
#17
Hao Jin, Xin Jin, Boran Cao, Wenbo Wang
Osteosarcoma is one of the most devastating cancers with associated poor prognosis. Chronic bone inflammation frequently predisposes to tumorigenesis and progression of osteosarcoma. In the tumor inflammatory microenvironment, caspase-1 and its processed cytokines such as interleukin 1β (IL-1β) play an important role in the occurrence and development of cancer. Berberine is an isoquinoline alkaloid extracted from the dry root of Coptidis Rhizoma, which has been found to exhibit significant anticancer effects on a wide spectrum of carcinomas including osteosarcoma...
February 2017: Oncology Reports
https://www.readbyqxmd.com/read/27992232/optically-detected-degradation-of-nayf4-yb-tm-based-upconversion-nanoparticles-in-phosphate-buffered-saline-solution
#18
Olivija Plohl, Marco Kraft, Janez Kovač, Blaž Belec, Maja Ponikvar-Svet, Christian Würth, Darja Lisjak, Ute Resch-Genger
In a proof-of-concept study, we assessed different analytical and spectroscopic parameters for stability screening of differently sized β-NaYF4:20 mol % Yb(3+), 2 mol % Tm(3+) upconversion nanoparticles (UCNPs) exemplarily in the bioanalytically relevant buffer phosphate buffered saline (PBS; pH 7.4) at 37 and 50 °C. This included the potentiometric determination of the amount of released fluoride ions, surface analysis with X-ray photoelectron spectroscopy (XPS), and steady-state and time-resolved fluorescence measurements...
January 3, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27976907/four-and-five-component-syntheses-and-photophysical-properties-of-emission-solvatochromic-3-aminovinylquinoxalines
#19
Charlotte F Gers-Panther, Henry Fischer, Jan Nordmann, Theresa Seiler, Thomas Behnke, Christian Würth, Walter Frank, Ute Resch-Genger, Thomas J J Müller
3-Aminovinylquinoxalines are readily accessible from (hetero)aryl glyoxylic acids or heterocyclic π-nucleophiles by consecutive four- and five-component syntheses in the sense of an activation-alkynylation-cyclocondensation-addition sequence or glyoxylation-alkynylation-cyclocondensation-addition sequence in good yields. The title compounds are highly fluorescent with pronounced emission solvatochromicity and protochromic fluorescence quenching. Time-resolved fluorescence spectroscopy furnishes radiative and nonradiative fluorescence decay rates in various solvent polarities...
December 28, 2016: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/27900430/visible-and-red-emissive-molecular-beacons-for-optical-temperature-measurements-and-quality-control-in-diagnostic-assays-utilizing-temperature-dependent-amplification-reactions
#20
Zerrin Fidan, Andy Wende, Ute Resch-Genger
Quality control requirements imposed on assays used in clinical diagnostics and point-of-care-diagnostic testing (POCT), utilizing amplification reactions performed at elevated temperatures of 35 to 95 °C are very stringent. As the temperature of a reaction vessel has a large impact on the specificity and sensitivity of the amplification reaction, simple tools for local in situ temperature sensing and monitoring are required for reaction and assay control. We describe here a platform of stem-and-loop structured DNA hairpins (molecular beacons, MBs), absorbing and emitting in the visible and red spectral region, rationally designed for precise temperature measurements in microfluidic assays for POCT, and their application for temperature measurements in a common DNA-based molecular biological assay utilizing thermophilic helicase-dependent amplification (tHDA)...
November 29, 2016: Analytical and Bioanalytical Chemistry
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