Use the keywords feature with a free QxMD account.
Use Read by QxMD to access full text via your institution or open access sources.
Read also provides personalized recommendations to keep you up to date in your field.
Existing User
Sign InNew to Read
Sign Up#21
REVIEW
Michihiro Nagao, Hideki Seto
Neutron scattering methods are powerful tools for the study of the structure and dynamics of lipid bilayers in length scales from sub Å to tens to hundreds nm and the time scales from sub ps to μ s. These techniques also are nondestructive and, perhaps most importantly, require no additives to label samples. Because the neutron scattering intensities are very different for hydrogen- and deuterium-containing molecules, one can replace the hydrogen atoms in a molecule with deuterium to prepare on demand neutron scattering contrast without significantly altering the physical properties of the samples...
June 2023: Biophysics reviews
#22
JOURNAL ARTICLE
Jongwon Lee, Kyung Jin Lee, Dae Wook Hwang, Seung-Mo Hong
Pancreatic neuroendocrine microtumor (PNEMT) is a neuroendocrine tumor (NET) < 0.5 cm in diameter, and it is considered benign. We report a PNEMT with high-grade transformation (HGT). A man in his 60s with von Hippel-Lindau syndrome underwent surgical resection of a NET. A second sub-centimeter nodule with a nodule-in-nodule pattern was discovered. The 0.4 cm outer nodule contained clear columnar cells with round nuclei and indistinct nucleoli, while the 0.1 cm inner nodule had eosinophilic cells with an increased nuclear to cytoplasmic ratio, vesicular nuclei, and prominent nucleoli...
March 2024: Journal of Pathology and Translational Medicine
#23
JOURNAL ARTICLE
Nada K Sedky, Noha Khalil Mahdy, Nour M Abdel-Kader, Manal M M Abdelhady, Mohamad Maged, Aya L Allam, Mohammad Y Alfaifi, Samir N Shamma, Hatem A F M Hassan, Sherif Ashraf Fahmy
Combining sonochemistry with phytochemistry is a modern trend in the biosynthesis of metallic nanoparticles (NPs), which contributes to the sustainability of chemical processes and minimizes hazardous effects. Herein, titanium dioxide (TiO2 ) NPs were bioengineered using a novel and facile ultrasound-assisted approach utilizing the greenly extracted essential oil of Ocimum basilicum . FTIR and UV-Vis spectrophotometry were used to confirm the formation of TiO2 NPs. The X-ray diffraction (XRD) analysis showed the crystalline nature of TiO2 NPs...
March 6, 2024: RSC Advances
#24
JOURNAL ARTICLE
Nyamai Mutono, Maria-Gloria Basáñez, Ananthu James, Wilma A Stolk, Anita Makori, Teresia Njoki Kimani, T Déirdre Hollingsworth, Andreia Vasconcelos, Matthew A Dixon, Sake J de Vlas, S M Thumbi
BACKGROUND: WHO has proposed elimination of transmission of onchocerciasis (river blindness) by 2030. More than 99% of cases of onchocerciasis are in sub-Saharan Africa. Vector control and mass drug administration of ivermectin have been the main interventions for many years, with varying success. We aimed to identify factors associated with elimination of onchocerciasis transmission in sub-Saharan Africa. METHODS: For this systematic review and meta-analysis we searched for published articles reporting epidemiological or entomological assessments of onchocerciasis transmission status in sub-Saharan Africa, with or without vector control...
March 11, 2024: Lancet Global Health
#25
JOURNAL ARTICLE
Yuyang Li, Xiaoxiao Li, Runlong Cai, Chao Yan, Guangjie Zheng, Yiran Li, Yijing Chen, Yusheng Zhang, Yishuo Guo, Chenjie Hua, Veli-Matti Kerminen, Yongchun Liu, Markku Kulmala, Jiming Hao, James N Smith, Jingkun Jiang
New particle formation and growth greatly influence air quality and the global climate. Recent CERN Cosmics Leaving OUtdoor Droplets (CLOUD) chamber experiments proposed that in cold urban atmospheres with highly supersaturated HNO3 and NH3 , newly formed sub-10 nm nanoparticles can grow rapidly (up to 1000 nm h-1 ). Here, we present direct observational evidence that in winter Beijing with persistent highly supersaturated HNO3 and NH3 , nitrate contributed less than ∼14% of the 8-40 nm nanoparticle composition, and overall growth rates were only ∼0...
March 13, 2024: Environmental Science & Technology
#26
JOURNAL ARTICLE
Andrew M Boyce, Hengming Li, Nathaniel C Wilson, Deniz Acil, Amirhassan Shams-Ansari, Srivatsa Chakravarthi, Christian Pederson, Qixin Shen, Nicholas Yama, Kai-Mei C Fu, Marko Loncar, Maiken H Mikkelsen
Silicon vacancy centers (SiVs) in diamond have emerged as a promising platform for quantum sciences due to their excellent photostability, minimal spectral diffusion, and substantial zero-phonon line emission. However, enhancing their slow nanosecond excited-state lifetime by coupling to optical cavities remains an outstanding challenge, as current demonstrations are limited to ∼10-fold. Here, we couple negatively charged SiVs to sub-diffraction-limited plasmonic cavities and achieve an instrument-limited ≤8 ps lifetime, corresponding to a 135-fold spontaneous emission rate enhancement and a 19-fold photoluminescence enhancement...
March 13, 2024: Nano Letters
#27
JOURNAL ARTICLE
Therese B Johansson, Rubina Davtyan, Julia Valderas-Gutiérrez, Adrian Gonzalez Rodriguez, Björn Agnarsson, Roberto Munita, Thoas Fioretos, Henrik Lilljebjörn, Heiner Linke, Fredrik Höök, Christelle N Prinz
The detection of oligonucleotides is a central step in many biomedical investigations. The most commonly used methods for detecting oligonucleotides often require concentration and amplification before detection. Therefore, developing detection methods with a direct read-out would be beneficial. Although commonly used for the detection of amplified oligonucleotides, fluorescent molecular beacons have been proposed for such direct detection. However, the reported limits of detection using molecular beacons are relatively high, ranging from 100 nM to a few µM, primarily limited by the beacon fluorescence background...
February 29, 2024: Nanomaterials
#28
JOURNAL ARTICLE
Kristina Kutukova, Bartlomiej Lechowski, Joerg Grenzer, Peter Krueger, André Clausner, Ehrenfried Zschech
High-resolution imaging of Cu/low-k on-chip interconnect stacks in advanced microelectronic products is demonstrated using full-field transmission X-ray microscopy (TXM). The comparison of two lens-based laboratory X-ray microscopes that are operated at two different photon energies, 8.0 keV and 9.2 keV, shows a contrast enhancement for imaging of copper nanostructures embedded in insulating organosilicate glass of a factor of 5 if 9.2 keV photons are used. Photons with this energy (Ga-Kα radiation) are generated from a Ga-containing target of a laboratory X-ray source applying the liquid-metal-jet technology...
February 29, 2024: Nanomaterials
#29
JOURNAL ARTICLE
Gyöngyi Gombár, Ditta Ungor, István Szatmári, Ádám Juhász, Edit Csapó
Sub-nanometer-sized gold nanoclusters (Au NCs) were prepared via the spontaneous reduction of [AuCl4 ]- - ions with a hydroxamate derivative of L -tryptophan (Trp) natural amino acid (TrpHA). The prepared TrpHA-Au NCs possess intense blue emission (λem = 470 nm; λex = 380 nm) with a 2.13% absolute quantum yield and 1.47 ns average lifetime. The Trp-stabilized noble metal NCs are excellent metal ion sensors for Fe3+ , but in this work, we highlighted that the incorporation of the hydroxamate functional group with an excellent metal ion binding capability can tune the selectivity and sensitivity of these NCs, which is a promising way to design novel strategies for the detection of other metal ions as well...
February 27, 2024: Nanomaterials
#30
JOURNAL ARTICLE
Chenxin Zhou, Qingtong Wang, Changlin Dong, Jiajun Gu, Di Zhang
We constructed a bio-structured surface-plasmonic/magneto-optic composite of ferromagnet metal Ni and noble metal Au. It was found that Ni Morpho menelaus (Mm) butterfly wings (BWs) with a natural photonic crystal structure have an apparent enhancement of light reflection under a 0.3 T magnetic field. Additional introduction of discrete Au particles helps further increase this magnetism-induced response. Compared with Mm-Ni-BWs, Mm-Ni-Au30-BWs' reflectance increases 5.3 times at 1944 nm. This investigation helps reveal and understand the effects of new micro-nanostructures on surface plasmon/magneto-optic coupling, benefiting future applications of biology sensors, chemical sensors, photonic chips, electrical communication systems, etc...
March 6, 2024: RSC Advances
#31
JOURNAL ARTICLE
Meritxell Garcia-Marlès, Rosa Lara, Cristina Reche, Noemí Pérez, Aurelio Tobías, Marjan Savadkoohi, David Beddows, Imre Salma, Máté Vörösmarty, Tamás Weidinger, Christoph Hueglin, Nikos Mihalopoulos, Georgios Grivas, Panayiotis Kalkavouras, Jakub Ondráček, Nadĕžda Zíková, Jarkko V Niemi, Hanna E Manninen, David C Green, Anja H Tremper, Michael Norman, Stergios Vratolis, Konstantinos Eleftheriadis, Francisco J Gómez-Moreno, Elisabeth Alonso-Blanco, Alfred Wiedensohler, Kay Weinhold, Maik Merkel, Susanne Bastian, Barbara Hoffmann, Hicran Altug, Jean-Eudes Petit, Olivier Favez, Sebastiao Martins Dos Santos, Jean-Philippe Putaud, Adelaide Dinoi, Daniele Contini, Hilkka Timonen, Janne Lampilahti, Tuukka Petäjä, Marco Pandolfi, Philip K Hopke, Roy M Harrison, Andrés Alastuey, Xavier Querol
Ultrafine particles (UFP, those with diameters ≤ 100 nm), have been reported to potentially penetrate deeply into the respiratory system, translocate through the alveoli, and affect various organs, potentially correlating with increased mortality. The aim of this study is to assess long-term trends (5-11 years) in mostly urban UFP concentrations based on measurements of particle number size distributions (PNSD). Additionally, concentrations of other pollutants and meteorological variables were evaluated to support the interpretations...
February 17, 2024: Environment International
#32
JOURNAL ARTICLE
Boying Zhang, Huimin Gao, Yazhou Kang, Xiaoming Li, Qing Li, Pengda Zhai, Diane Hildebrandt, Xinying Liu, Yue Wang, Shanlin Qiao
Covalent organic frameworks (COFs) face limited processability challenges as photoelectrodes in photoelectrochemical water reduction. Herein, sub-10 nm benzothiazole-based colloidal conjugated reticular oligomers (CROs) are synthesized using an aqueous nanoreactor approach, and the end-capping molecular strategy to engineer electron-deficient units onto the periphery of a CRO nanocrystalline lattices (named CROs-Cg). This results in stable and processable "electronic inks" for flexible photoelectrodes...
March 7, 2024: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
#33
JOURNAL ARTICLE
N Yamamoto, A P Yalin
We present the development of a portable Thomson scattering diagnostic system allowing simultaneous spatially and temporally resolved plasma property measurements for low density plasmas. The setup uses a compact pulsed Nd:YAG laser (532 nm) as the light source with suppression by two volume Bragg grating notch filters and dispersion with a single-stage spectrometer before measurement with an intensified camera. A key issue is the detailed light collection and how it impacts the sensitivity and elastic light suppression, for which we have investigated two optical configurations, one based on a 7 × 1 linear fiber bundle and the other based on a slit spatial-filter...
March 1, 2024: Review of Scientific Instruments
#34
JOURNAL ARTICLE
Huimin Wang, Zhe-Ning Chen, Yuanyuan Wang, Dongshuang Wu, Minna Cao, Fanfei Sun, Rong Cao
The absence of efficient and durable catalysts for oxygen evolution reaction (OER) is the main obstacle to hydrogen production through water splitting in an acidic electrolyte. Here, we report a controllable synthesis method of surface IrO x with changing Au/Ir compositions by constructing a range of sub-10-nm-sized core-shell nanocatalysts composed of an Au core and Au x Ir1- x alloy shell. In particular, [email protected] Ir0.57 exhibits 4.5 times higher intrinsic OER activity than that of the commercial Ir/C. Synchrotron X-ray-based spectroscopies, electron microscopy and density functional theory calculations revealed a balanced binding of reaction intermediates with enhanced activity...
April 2024: National Science Review
#35
JOURNAL ARTICLE
Alireza Aminoroaya, Saied Nouri Khorasani, Rouholah Bagheri, Zahra Talebi, Roya Malekkhouyan, Oisik Das, Rasoul Esmaeely Neisiany
Polymer microcapsules containing cyanoacrylates have represented a promising option to develop self-healing biomaterials. This study aims to develop an electrospray method for the preparation of capsules using poly(methyl methacrylate) (PMMA) as the encapsulant and ethyl 2-cyanoacrylate (EC) as the encapsulate. It also aims to study the effect of the electrospray process parameters on the size and morphology of the capsules. The capsules were characterized using Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and field-emission scanning electron microscopy (FE-SEM)...
March 5, 2024: Scientific Reports
#36
JOURNAL ARTICLE
Shande Liu, Peifu Wang, Kuan Li, Jiawen Lv, Yicheng Jin, Xiaodong Xu, Zhanxin Wang, Jian Liu, Junting Liu, Yongguang Zhao
Tm,Ho:CaYLuAlO4 (Tm,Ho:CALYLO) crystal has wide emission spectra both for π-polarization and σ-polarization, showing significant potential for the generation of ultrashort pulses. Here, a widely tunable and passively mode-locked laser operation based on Tm,Ho:CALYLO crystal under two polarizations was demonstrated for what we believe to be the first time ever. For π-polarization, a maximum output power of 1.52 W and a tuning range of 255.3 nm were achieved in the continuous wave (CW) regime...
February 26, 2024: Optics Express
#37
JOURNAL ARTICLE
Amy L Lynch, Christopher P Murray, Evan Roy, Clive Downing, David McCloskey
As technology development drives the thickness of thin film depositions down into the nano regime, understanding and controlling the dewetting of thin films has become essential for many applications. The dewetting of ultra-thin Ag (9 nm) films with Ti (0.5 nm) adhesion and capping layers on glass substrates was investigated in this work. Various thin film stacks were created using magnetron sputtering and were analyzed using scanning electron microscopy/energy dispersive X-rays, Vis/IR spectrometry, and four four-point probe resistivity measurements...
February 27, 2024: ACS Omega
#38
JOURNAL ARTICLE
Venkata S C Kuppili, Matthew Ball, Darren Batey, Kathryn Dodds, Silvia Cipiccia, Kaz Wanelik, Roger Fu, Christoph Rau, Richard J Harrison
We apply X-ray ptycho-tomography to perform high-resolution, non-destructive, three-dimensional (3D) imaging of Fe-rich inclusions in paleomagnetically relevant materials (zircon single crystals from the Bishop Tuff ignimbrite). Correlative imaging using quantum diamond magnetic microscopy combined with X-ray fluorescence mapping was used to locate regions containing potential ferromagnetic remanence carriers. Ptycho-tomographic reconstructions with voxel sizes 85 nm and 21 nm were achievable across a field-of-view > 80 µm; voxel sizes as small as 5 nm were achievable over a limited field-of-view using local ptycho-tomography...
March 1, 2024: Scientific Reports
#39
JOURNAL ARTICLE
Bart W L van den Bersselaar, Alex P A van de Ven, Bas F M de Waal, Stefan C J Meskers, F Eisenreich, G Vantomme
Spontaneous phase separation is a promising strategy for the development of novel electronic materials, as the resulting well-defined morphologies generally exhibit enhanced conductivity. Making these structures adaptive to external stimuli is challenging, yet crucial as multi-state reconfigurable switching is essential for neuromorphic materials. Here, a modular and scalable approach is presented to obtain switchable phase-separated viologen-siloxane nanostructures with sub-5 nm features. The domain spacing, morphology and conductivity of these materials can be tuned by ion exchange, repeated pulsed photo-irradiation and electric stimulation...
February 27, 2024: Advanced Materials
#40
JOURNAL ARTICLE
Melanie Fritz, Xiaochen Chen, Guifang Yang, Yuancai Lv, Minghua Liu, Stefan Wehner, Christian B Fischer
The production of isolated metallic nanoparticles with multifunctionalized properties, such as size and shape, is crucial for biomedical, photocatalytic, and energy storage or remediation applications. This study investigates the initial particle formations of gold nanoparticles (AuNPs) bioproduced in the cyanobacteria Anabaena sp. using high-resolution transmission electron microscopy images for digital image analysis. The developed method enabled the discovery of cerium nanoparticles (CeNPs), which were biosynthesized in the cyanobacteria Calothrix desertica ...
February 4, 2024: Microorganisms
Make the most of Read.
Download the mobile app.
Download the mobile app.
Fetching more papers... 
