keyword
MENU ▼
Read by QxMD icon Read
search

Silica

keyword
https://www.readbyqxmd.com/read/29346412/a-comparative-analysis-of-preservation-techniques-for-the-optimal-molecular-detection-of-hookworm-dna-in-a-human-fecal-specimen
#1
Marina Papaiakovou, Nils Pilotte, Ben Baumer, Jessica Grant, Kristjana Asbjornsdottir, Fabian Schaer, Yan Hu, Raffi Aroian, Judd Walson, Steven A Williams
BACKGROUND: Proper collection and storage of fecal samples is necessary to guarantee the subsequent reliability of DNA-based soil-transmitted helminth diagnostic procedures. Previous research has examined various methods to preserve fecal samples for subsequent microscopic analysis or for subsequent determination of overall DNA yields obtained following DNA extraction. However, only limited research has focused on the preservation of soil-transmitted helminth DNA in stool samples stored at ambient temperature or maintained in a cold chain for extended periods of time...
January 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29346293/fabry-perot-interferometric-high-temperature-sensing-up-to-1200-%C3%A2-c-based-on-a-silica-glass-photonic-crystal-fiber
#2
Haihu Yu, Ying Wang, Jian Ma, Zhou Zheng, Zhuozhao Luo, Yu Zheng
A Fabry-Perot interferometric sensor for temperature measurement was fabricated based on a silica glass solid-core photonic crystal fiber with a central air-bore. By splicing a stub of photonic crystal fiber to a standard single-mode fiber, an intrinsic Fabry-Perot cavity was formed inside the photonic crystal fiber. Sensing experiment results show that the sensor can work stably for a consecutive 24 h under temperatures up to 1100 °C, and the short-term operation temperature can reach as high as 1200 °C (<30 min)...
January 18, 2018: Sensors
https://www.readbyqxmd.com/read/29345945/chitosan-silica-hybrid-composites-for-removal-of-sulfonated-azo-dyes-from-aqueous-solutions
#3
Magdalena Blachnio, Tetyana M Budnyak, Anna Derylo-Marczewska, Adam W Marczewski, Valentin A Tertykh
In this study, the influence of chitosan immobilization method on properties of final hybrids materials was performed. Chitosan immobilized on the surface of mesoporous (ChS2) and fumed silica (ChS3) by physical adsorption and through sol-gel method (ChS1). It was found that physical immobilization of chitosan allow to obtain hybrid composites (ChS) with homogeneous distribution of polymer on the surface, relatively wide pores and specific surface area about 170 m2/g, pHPZC=5.7 for ChS3 and 356 m2/g, pHPZC=6...
January 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29345456/pre-occupation-of-empty-carriers-decreases-endo-lysosome-escape-and-reduces-the-protein-delivery-efficiency-of-mesoporous-silica-nanoparticles
#4
Wenqing Li, Liping Sun, Yiqiu Xia, Si-Jie Hao, Gong Cheng, Zhigang Wang, Yuan Wan, Chuandong Zhu, Hongzhang He, Si-Yang Zheng
Endo/lysosome escape is a major challenge in nanoparticles-based protein delivery for cancer therapy. To enhance endo/lysosomal escape and increase the efficacy of proteins delivery, current strategies mainly focuses on destroying endo/lysosomes by employing modified nanoparticles, such as pH-sensitive polyplexes, cell-penetrating peptides, and photosensitive molecules. Herein, we hypothesize that pre-treatment with empty nanocarriers might make endo/lysosomes occupied and affect the endo/lysosomal escape of subsequent protein delivery by nanocarriers...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29345434/two-photon-excited-silica-and-organosilica-nanoparticles-for-spatiotemporal-cancer-treatment
#5
REVIEW
Jonas G Croissant, Jeffrey I Zink, Laurence Raehm, Jean-Olivier Durand
Coherent two-photon-excited (TPE) therapy in the near-infrared (NIR) provides safer cancer treatments than current therapies lacking spatial and temporal selectivities because it is characterized by a 3D spatial resolution of 1 µm3 and very low scattering. In this review, the principle of TPE and its significance in combination with organosilica nanoparticles (NPs) are introduced and then studies involving the design of pioneering TPE-NIR organosilica nanomaterials are discussed for bioimaging, drug delivery, and photodynamic therapy...
January 18, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29344297/mesoporous-carbon-nanospheres-as-a-multifunctional-carrier-for-cancer-theranostics
#6
Libo Zhou, Ying Jing, Yubin Liu, Zhihe Liu, Duyang Gao, Haobin Chen, Weiye Song, Tao Wang, Xiaofeng Fang, Weiping Qin, Zhen Yuan, Sheng Dai, Zhen-An Qiao, Changfeng Wu
Optical nanomaterials with intense absorption in near-infrared (NIR) region hold great promise for biomedical applications such as photothermal therapy (PTT) and photoacoustic imaging (PAI). In this work, we report mesoporous carbon nanospheres (Meso-CNs) with broadband and intense absorption in the UV-Vis-NIR region (300-1400 nm) and explore their potential as a multifunctional platform for photoacoustic imaging and chemo-photothermal therapy. Methods: Meso-CNs were prepared by a "silica-assisted" synthesis strategy and characterized by transmission electron microscope and optical spectroscopy...
2018: Theranostics
https://www.readbyqxmd.com/read/29343957/codelivery-of-doxorubicin-and-mdr1-sirna-by-mesoporous-silica-nanoparticles-polymerpolyethylenimine-to-improve-oral-squamous-carcinoma-treatment
#7
Dandan Wang, Xiaowei Xu, Kai Zhang, Bin Sun, Lu Wang, Lin Meng, Qilin Liu, Changyu Zheng, Bai Yang, Hongchen Sun
Oral cancer is a type of head and neck cancer that is the seventh most frequent cancer and the ninth most frequent cause of death globally. About 90% of oral cancer is of squamous cell carcinoma type. Surgery and radiation with and without chemotherapy are the major treatments for oral cancer. Better advanced treatment is still needed. Multidrug resistance plays an important role in failure of oral cancer chemotherapy. In this study, we tried to fabricate a novel nanoparticle that could carry both MDR1-siRNA to block MDR1 expression and doxorubicin (DOX), a chemotherapy drug, into cancer cells in order to directly kill the cells with little or no effect of multidrug resistance...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29343865/targeting-murine-leukemic-stem-cells-by-antibody-functionalized-mesoporous-silica-nanoparticles
#8
Tamoghna Mandal, Michaela Beck, Nicole Kirsten, Mika Lindén, Christian Buske
Acute leukemia is initiated and maintained by leukemia stem cells (LSCs) and therefore there is great interest to develop innovative therapeutic approaches which target LSCs. Here we show that mesoporous silica nanoparticles (MSNs) functionalized with succinic anhydride, tagged with an anti-B220 antibody and loaded with the anthracycline daunorubicin are efficiently incorporated into murine B220-positive AML LSCs and preferentially kill these cells in comparison to B220-negative AML LSCs in vitro. Furthermore, short - term treatment of the AML LSCs with these MSNs before transplant significantly delayed leukemia development in recipient mice...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343780/waste-windshield-derived-silicon-carbon-nanocomposites-as-high-performance-lithium-ion-battery-anodes
#9
Mingu Choi, Jae-Chan Kim, Dong-Wan Kim
Silicon has emerged as the most promising high-capacity material for lithium-ion batteries. Waste glass can be a potential low cost and environmentally benign silica resource enabling production of nanosized silicon at the industry level. Windshields are generally made of laminated glass comprising two separate glass bonded together with a layer of polyvinyl butyral sandwiched between them. Herein, silicon/carbon nanocomposites are fabricated from windshields for the first time via magnesiothermic reduction and facile carbonization process using both waste glass and polyvinyl butyral as silica and carbon sources, respectively...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343750/multi-wavelength-growth-of-nanosecond-laser-induced-surface-damage-on-fused-silica-gratings
#10
Maxime Chambonneau, Laurent Lamaignère
The nanosecond laser-induced damage growth phenomenon on the exit surface of fused silica grating is investigated at 1064 nm and 355 nm separately and also simultaneously. Experiments are first carried out on damage sites on a plane fused silica sample showing two different morphologies, and a damage type is selected for ensuring the repeatability of the subsequent tests. Comparing the mono-wavelength growth results on a grating and a plane fused silica sample, the periodic surface structure is found to be an aggravating factor for damage growth...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343729/drug-self-assembly-for-synthesis-of-highly-loaded-antimicrobial-drug-silica-particles
#11
Cameron A Stewart, Yoav Finer, Benjamin D Hatton
Antimicrobial drug release from biomaterials for orthopedic repair and dental restorations can prevent biofilm growth and caries formation. Carriers for drug incorporation would benefit from long-term drug storage, controlled release, and structural stability. Mesoporous silica, synthesized through a co-assembly of silica and surfactant template, is an ideal drug encapsulation scaffold that maintains structural integrity upon release. However, conventional loading of drug within meso-silica pores via concentration-gradient diffusion limits the overall payload, concentration uniformity, and drug release control...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343724/the-uv-filtering-potential-of-drop-casted-layers-of-frustules-of-three-diatom-species
#12
Yanyan Su, Torben A Lenau, Emil Gundersen, Jacob J K Kirkensgaard, Christian Maibohm, Jérôme Pinti, Marianne Ellegaard
Diatoms are in focus as biological materials for a range of photonic applications. Many of these applications would require embedding a multitude of diatoms in a matrix (e.g. paint, crème or lacquer); however, most studies on the photonic and spectral properties of diatoms frustules (silica walls) have been carried out on single cells. In this study, for the first time, we test the spectral properties of layers of frustules of three diatom species (Coscinodiscus granii, Thalassiosira punctifera and Thalassiosira pseudonana), with special focus on transmission and reflectance in the UV range...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29342234/stability-indicating-hplc-and-hptlc-methods-for-determination-of-agomelatine-and-its-degradation-products
#13
Maha M Abdelrahman, Ibrahim A Naguib, Mohamed R El Ghobashy, Nesma A Ali
Two accurate, sensitive and highly selective stability-indicating methods are developed and validated for simultaneous determination of Agomelatine (AGM) and its forced degradation products (Deg I and II). The first method is High-Performance Liquid Chromatography for separation and quantitation of AGM, Deg I and II on a C18 column (250 mm × 4.6 mm, 5 μm p.s) in isocratic mode by using a binary mixture of Potassium dihydrogen phosphate (0.05 M, pH adjusted to 2.9 with orthophosphoric acid): acetonitrile (60:40, v/v) at a flow rate of 2 mL/min...
January 12, 2018: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29342164/environmental-dust-inhalation-in-the-european-badger-meles-meles-systemic-distribution-of-silica-laden-macrophages-pathological-changes-and-association-with-mycobacterium-bovis-infection-status
#14
Janne M Schoening, Leigh A L Corner, Locksley L McV Messam, Joseph P Cassidy, Alan Wolfe
Chronic inhalation of crystalline silica and silicates may lead to severe lung disease in humans, termed silicosis. The disease is an occupational health concern in miners and related professions worldwide. Silicosis is also a strong risk factor for tuberculosis in humans. Due to its subterranean lifestyle, the European badger (Meles meles) is continuously exposed to environmental dust, while this species is also susceptible to tuberculosis, caused by Mycobacterium bovis. To date, a thorough investigation of mineral dust retention and its possible implication as a risk factor for mycobacterial infection in badgers has not been performed...
2018: PloS One
https://www.readbyqxmd.com/read/29341293/circularly-polarized-luminescence-appeared-from-complete-inorganic-materials-encapsulating-guest-lanthanide-oxides-in-host-chiral-silica
#15
Ren-Hua Jin
Recently, circularly polarized luminescence (CPL)-active systems have become a very hot and interesting subject in chirality- and optics-related areas. The CPL-active systems are usually available by two approaches: combining covalently a luminescent centre to chiral motif or associating the guest of luminescent probe to a chiral host. However, all the chiral components in CPL materials were organics although the parts of luminescent were alternative as organics or inorganics. Herein, we proposed the first totally inorganic CPL-active system by "luminescent guest - chiral host" strategy...
January 17, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29341224/comparative-rna-seq-transcriptome-analysis-on-silica-induced-pulmonary-inflammation-and-fibrosis-in-mice-silicosis-model
#16
Jiayi Chen, Yuqin Yao, Xiaolan Su, Ying Shi, Xuejiao Song, Linshen Xie, Jia You, Liantian Tian, Luo Yang, Aiping Fang, Jingyuan Xiong
Silicosis is a long-established public health issue in developing countries due to increasingly serious air pollution and poorly implemented occupational safety regulation. Inhalation of silica triggers cytotoxicity, oxidative stress, pulmonary inflammation and eventually silicosis. Current understanding in the pathogenesis and mechanism of silicosis is limited, and no effective cure is clinically available once silicosis is developed. A number of studies were conducted to investigate silica-induced alternate gene expressions in pulmonary cells...
January 16, 2018: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/29340980/facile-synthesis-of-chitosan-capped-mesoporous-silica-nanoparticles-a-ph-responsive-smart-delivery-platform-for-raloxifene-hydrochloride
#17
Priya V Shah, Sadhana J Rajput
An encapsulation of model drug raloxifene hydrochloride (RAL) inside the chitosan decorated pH responsive mesoporous system has a greater potential for accumulating in the tumor cells. The present study involves synthesis of surface modified mesoporous silica nanoparticles (MSN) with the aim of achieving pH sensitive drug delivery system. A silanol skeleton of MSN has been productively modified to amine intermediate which served as a firm platform to adapt chitosan grafted assembly and systematically evaluated...
January 16, 2018: AAPS PharmSciTech
https://www.readbyqxmd.com/read/29340852/a-geochemical-view-into-continental-palaeotemperatures-of-the-end-permian-using-oxygen-and-hydrogen-isotope-composition-of-secondary-silica-in-chert-rubble-breccia-kaibab-formation-grand-canyon-usa
#18
Ray Kenny
The upper carbonate member of the Kaibab Formation in northern Arizona (USA) was subaerially exposed during the end Permian and contains fractured and zoned chert rubble lag deposits typical of karst topography. The karst chert rubble has secondary (authigenic) silica precipitates suitable for estimating continental weathering temperatures during the end Permian karst event. New oxygen and hydrogen isotope ratios of secondary silica precipitates in the residual rubble breccia: (1) yield continental palaeotemperature estimates between 17 and 22 °C; and, (2) indicate that meteoric water played a role in the crystallization history of the secondary silica...
January 16, 2018: Geochemical Transactions
https://www.readbyqxmd.com/read/29340414/nanoparticle-separation-based-on-size-dependent-aggregation-of-nanoparticles-due-to-the-critical-casimir-effect
#19
Hongyu Guo, Gheorghe Stan, Yun Liu
Nanoparticles typically have an inherent wide size distribution that may affect the performance and reliability of many nanomaterials. Because the synthesis and purification of nanoparticles with desirable sizes are crucial to the applications of nanoparticles in various fields including medicine, biology, health care, and energy, there is a great need to search for more efficient and generic methods for size-selective nanoparticle purification/separation. Here we propose and conclusively demonstrate the effectiveness of a size-selective particle purification/separation method based on the critical Casimir force...
January 17, 2018: Soft Matter
https://www.readbyqxmd.com/read/29340218/synthesis-and-characterization-of-hybrid-core-shell-fe3o4-sio2-nanoparticles-for-biomedical-applications
#20
I V Zelepukin, V O Shipunova, A B Mirkasymov, P I Nikitin, M P Nikitin, S M Deyev
The creation of markers that provide both visual and quantitative information is of considerable importance for the mapping of tissue macrophages and other cells. We synthesized magnetic and magneto-fluorescent nanomarkers for the labeling of cells which can be detected with high sensitivity by the magnetic particle quantification (MPQ) technique. For stabilization under physiological conditions, the markers were coated with a dense silica shell. In this case, the size and zeta-potential of nanoparticles were controlled by a modified Stober reaction...
October 2017: Acta Naturae
keyword
keyword
15976
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"