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Epitaxial Ni nanoparticles on CaF2(001), (110) and (111) surfaces studied by three-dimensional RHEED, GIXD and GISAXS reciprocal-space mapping techniques
The development of growth techniques aimed at the fabrication of nanoscale heterostructures with layers of ferroic 3d metals on semiconductor substrates is very important for their potential usage in magnetic media recording applications. A structural study is presented of single-crystal nickel island ensembles grown epitaxially on top of CaF2/Si insulator-on-semiconductor heteroepitaxial substrates with (111), (110) and (001) fluorite surface orientations. The CaF2 buffer layer in the studied multilayer system prevents the formation of nickel silicide, guides the nucleation of nickel islands and serves as an insulating la...
Source: Journal of Applied Crystallography - May 16, 2017 Category: Physics Authors: Suturin, S.M. Fedorov, V.V. Korovin, A.M. Sokolov, N.S. Nashchekin, A.V. Tabuchi, M. Tags: epitaxial growth nickel nanoparticles fluorides on silicon reflection high-energy electron diffraction RHEED X-ray diffraction grazing-incidence small-angle X-ray scattering GISAXS three-dimensional reciprocal-space mapping research pape Source Type: research

Dual-targeted hybrid nanoparticles of synergistic drugs for treating lung metastases of triple negative breast cancer in mice
Xiao Yu Wu
Source: Acta Pharmacologica Sinica - June 1, 2017 Category: Drugs & Pharmacology Authors: Tian Zhang Preethy Prasad Ping Cai Chunsheng He Dan Shan Andrew Michael Rauth Xiao Yu Wu Tags: polymer-lipid hybrid nanoparticles triple negative breast cancer human MDA-MB-231 cells lung metastases doxorubicin mitomycin C synergistic action dual-targeted RGD Source Type: research

Sugar-based micro/mesoporous hypercross-linked polymers with in situ embedded silver nanoparticles for catalytic reduction
Abstract Porous hypercross-linked polymers based on perbenzylated monosugars (SugPOP-1–3) have been synthesized by Friedel–Crafts reaction using formaldehyde dimethyl acetal as an external cross-linker. Three perbenzylated monosugars with similar chemical structure were used as monomers in order to tune the porosity. These obtained polymers exhibit microporous and mesoporous features. The highest Brunauer–Emmett–Teller specific surface area for the resulting polymers was found to be 1220 m2 g−1, and the related carbon dioxide storage capacity was found to be 14.4 wt % at 1.0 bar and 273 K. As ...
Source: Beilstein Journal of Organic Chemistry - June 22, 2017 Category: Chemistry Authors: Beilstein Journal of Organic Chemistry - Syndicated Feeds Tags: catalytic reduction hypercross-linking porous polymers silver nanoparticles sugar Full Research Paper Source Type: research

A novel fast Fourier transform accelerated off-grid exhaustive search method for cryo-electron microscopy fitting
This paper presents a novel fast Fourier transform (FFT)-based exhaustive search method extended to off-grid translational and rotational degrees of freedom. The method combines the advantages of the FFT-based exhaustive search, which samples all the conformations of a system under study on a grid, with a local optimization technique that guarantees to find the nearest optimal off-grid conformation. The method is demonstrated on a fitting problem and can be readily applied to a docking problem. The algorithm first samples a scoring function on a six-dimensional grid of size N6 using the FFT. This operation has an asymptoti...
Source: Journal of Applied Crystallography - June 26, 2017 Category: Physics Authors: Hoffmann, A. Perrier, V. Grudinin, S. Tags: cryo-EM fitting fast Fourier transform FFT exhaustive search off-grid search trust-region problem research papers Source Type: research

A numerical method for deriving shape functions of nanoparticles for pair distribution function refinements
In the structural refinement of nanoparticles, discrete atomistic modeling can be used for small nanocrystals (
Source: Acta Crystallographica Section A - June 6, 2018 Category: Chemistry Authors: Usher, T.-M. Olds, D. Liu, J. Page, K. Tags: nanoparticles shape function pair distribution function total scattering research papers Source Type: research

Stochastic models of dense or hollow nanoparticles and their scattering properties
A family of stochastic models of disordered particles is proposed, obtained by clipping a Gaussian random field with a function that is space dependent. Depending on the shape of the clipping function, dense or hollow particles can be modelled. General expressions are derived for the form factor of the particles, for their average volume and surface area, and for their density and surface-area distributions against the distance to the particle centre. A general approximation for the form factor is also introduced, based on the density and surface-area distributions, which coincides with the Guinier and Porod expressions in...
Source: Journal of Applied Crystallography - May 28, 2020 Category: Physics Authors: Gommes, C.J. Chattot, R. Drnec, J. Tags: small-angle scattering form factor disordered structures hollow nanoparticles Gaussian random field research papers Source Type: research

A new and efficient methodology for olefin epoxidation catalyzed by supported cobalt nanoparticles
Abstract A new heterogeneous catalytic system consisting of cobalt nanoparticles (CoNPs) supported on MgO and tert-butyl hydroperoxide (TBHP) as oxidant is presented. This CoNPs@MgO/t-BuOOH catalytic combination allowed the epoxidation of a variety of olefins with good to excellent yield and high selectivity. The catalyst preparation is simple and straightforward from commercially available starting materials and it could be recovered and reused maintaining its unaltered high activity. Beilstein J. Org. Chem. 2021, 17, 519–526. doi:10.3762/bjoc.17.46
Source: Beilstein Journal of Organic Chemistry - February 22, 2021 Category: Chemistry Authors: Beilstein Journal of Organic Chemistry - Syndicated Feeds Tags: alkenes cobalt nanoparticles epoxides oxidation TBHP Full Research Paper Source Type: research

Optimizing the geometry of aerodynamic lens injectors for single-particle coherent diffractive imaging of gold nanoparticles
Single-particle X-ray diffractive imaging (SPI) of small (bio-)nanoparticles (NPs) requires optimized injectors to collect sufficient diffraction patterns to allow for the reconstruction of the NP structure with high resolution. Typically, aerodynamic lens-stack injectors are used for NP injection. However, current injectors were developed for larger NPs (>100   nm), and their ability to generate high-density NP beams suffers with decreasing NP size. Here, an aerodynamic lens-stack injector with variable geometry and a geometry-optimization procedure are presented. The optimization for 50   nm gold-NP (AuNP) injection ...
Source: Journal of Applied Crystallography - November 16, 2021 Category: Physics Authors: Worbs, L. Roth, N. L ü bke, J. Estillore, A.D. Xavier, P.L. Samanta, A.K. K ü pper, J. Tags: injectors single particles sample delivery X-ray free-electron lasers XFELs nanoparticles coherent diffractive imaging numerical simulations high-density beams research papers Source Type: research

Small-angle X-ray scattering: characterization of cubic Au nanoparticles using Debye's scattering formula
A versatile software package in the form of a Python extension, named CDEF (computing Debye's scattering formula for extraordinary form factors), is proposed to calculate approximate scattering profiles of arbitrarily shaped nanoparticles for small-angle X-ray scattering (SAXS). CDEF generates a quasi-randomly distributed point cloud in the desired particle shape and then applies the open-source software DEBYER for efficient evaluation of Debye's scattering formula to calculate the SAXS pattern (https://github.com/j-from-b/CDEF). If self-correlation of the scattering signal is not omitted, the quasi-random distribution pro...
Source: Journal of Applied Crystallography - July 15, 2022 Category: Physics Authors: Deumer, J. Pauw, B.R. Marguet, S. Skroblin, D. Tach é , O. Krumrey, M. Gollwitzer, C. Tags: small-angle X-ray scattering non-spherical nanoparticles Debye scattering equation research papers Source Type: research

Announcing new links and annotations on Conserved Domain Search results!
Conserved Domain Search (CD Search) results now show domain architecture information and other annotations that further characterize predicted domain and protein function. These include links to PubMed, Gene Ontology (GO) terms, Enzyme Commission (EC) numbers, and the SPARCLE Domain Architecture Viewer. You can use these links on the results to find literature (PubMed), assign biological … Continue reading Announcing new links and annotations on Conserved Domain Search results! → The post Announcing new links and annotations on Conserved Domain Search results! appeared first on NCBI Insights.
Source: NCBI Insights - August 10, 2022 Category: Databases & Libraries Authors: NCBI Staff Tags: What's New Basic Local Alignment Search Tool (BLAST) Comparative Genomics Resource (CGR) Conserved Domains Database (CDD) Gene Ontology (GO) Subfamily Protein Architecture Labeling Engine (SPARCLE) Source Type: news

Facebook Graph Search in Medicine
Everyone has heard about the new Graph Search function on Facebook. It says “Want to start a book club or find a gym buddy? Connect with friends who like the same activities—and meet new people, too.” It will let Facebook users do searches by choosing different parameters (e.g. who goes to the same gym as me and is single). Well, many bloggers are optimistic about this launch and think it will be used in medicine too. I don’t think so and everyone should hope I’ll be right. It’s fun to identify friends in my community who I share the same multiple interests with (e.g. sci-fi and reading book...
Source: ScienceRoll - January 26, 2013 Category: Geneticists and Genetics Commentators Authors: Dr. Bertalan Meskó Tags: Facebook Health 2.0 Medical Search Medicine Medicine 2.0 Video Web 2.0 Source Type: blogs

FindZebra: A Search Engine That Diagnoses Rare Diseases
The Danish researchers behind FindZebra would not be happy about my title as they published a warning on the top of their search engine with the message: “This is a research project to be used only by medical professionals.” This search engine only uses medical databases similarly to SciencerollSearch and named the rare disease correctly after entering the symptoms 67%  of the time, compared to 32% using Google. I think educating both patients and medical professionals about the proper use of search engines and operators would provide even better results. Here is their description. There are close to 7,000 rar...
Source: ScienceRoll - April 5, 2013 Category: Geneticists and Genetics Commentators Authors: Dr. Bertalan Meskó Tags: eHealth Medical Search Medicine Medicine 2.0 Web 2.0 Source Type: blogs

Prevalence of Diabetes Mellitus in U.S. Youth in 2009: The SEARCH for Diabetes in Youth Study.
ConclusionDiabetes mellitus, one of the leading chronic diseases in childhood, affects over 190,000 (1 out of 433) youth less than age 20 years in the US, with racial and ethnic disparities seen in diabetes prevalence, overall and by diabetes type. PMID: 24041677 [PubMed - as supplied by publisher]
Source: Diabetes Care - September 16, 2013 Category: Endocrinology Authors: Pettitt DJ, Talton J, Dabelea D, Divers J, Imperatore G, Lawrence JM, Liese AD, Linder B, Mayer-Davis EJ, Pihoker C, Saydah SH, Standiford DA, Hamman RF, for the SEARCH for Diabetes in Youth Study Group Tags: Diabetes Care Source Type: research

Peripheral Neuropathy in Adolescents and Young Adults With Type 1 and Type 2 Diabetes From the SEARCH for Diabetes in Youth Follow-Up Cohort: A pilot study.
CONCLUSIONSDPN prevalence among youth with type 2 diabetes approached rates reported in adult populations with diabetes. Our findings suggest not only that youth with diabetes are at risk for DPN but also that many already show measurable signs of DPN. PMID: 24144652 [PubMed - as supplied by publisher]
Source: Diabetes Care - October 21, 2013 Category: Endocrinology Authors: Jaiswal M, Lauer A, Martin CL, Bell RA, Divers J, Dabelea D, Pettitt DJ, Saydah S, Pihoker C, Standiford DA, Rodriguez BL, Pop-Busui R, Feldman EL, for The SEARCH For Diabetes In Youth Study Group Tags: Diabetes Care Source Type: research

Sara—the Search and Rescue Dog—and her Game of Fetch
Editor’s note: Jana Sweeny is the American Red Cross’s Director of International Communications. She and her team are traveling around Colombia this week, visiting communities made safer by the Red Cross.   As we walk into the Colombian Red Cross training center in Pereira, a yellow lab comes bouncing up, waving her tail enthusiastically. The ball in her mouth turns out to be a lime and she is ready to play fetch. Because I can never say no to a dog, I begin a game of “fetch the lime” with her. It turns out that Sara isn’t just a fun companion–she is a retired search and rescue dog.  The Colo...
Source: Red Cross Chat - January 24, 2014 Category: Global & Universal Authors: Jenelle Eli Tags: International Preparedness colombia dogs pets Search and Rescue South America Source Type: news