keyword
MENU ▼
Read by QxMD icon Read
search

Dependance

keyword
https://www.readbyqxmd.com/read/28532131/investigation-into-the-anomalous-temperature-characteristics-of-ingan-double-quantum-well-blue-laser-diodes-using-numerical-simulation
#1
Han-Youl Ryu
GaN-based blue laser diodes (LDs) may exhibit anomalous temperature characteristics such as a very high characteristic temperature (T 0) or even negative T 0. In this work, temperature-dependent characteristics of GaN-based blue LDs with InGaN double quantum well (QW) structures were investigated using numerical simulations. The temperature-dependent threshold current is found to become increasingly anomalous as the thickness or doping concentration of the barrier layer between QWs increases. For a properly chosen barrier thickness and doping concentration, very high T 0 of >10,000 K can be obtained...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28532130/effect-of-systematic-control-of-pd-thickness-and-annealing-temperature-on-the-fabrication-and-evolution-of-palladium-nanostructures-on-si-111-via-the-solid-state-dewetting
#2
Sundar Kunwar, Puran Pandey, Mao Sui, Quanzhen Zhang, Ming-Yu Li, Jihoon Lee
Si-based optoelectronic devices embedded with metallic nanoparticles (NPs) have demonstrated the NP shape, size, spacing, and crystallinity dependent on light absorption and emission induced by the localized surface plasmon resonance. In this work, we demonstrate various sizes and configurations of palladium (Pd) nanostructures on Si (111) by the systematic thermal annealing with the variation of Pd thickness and annealing temperature. The evolution of Pd nanostructures are systematically controlled by the dewetting of thin film by means of the surface diffusion in conjunction with the surface and interface energy minimization and Volmer-Weber growth model...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28532125/colorimetric-humidity-sensors-based-on-electrospun-polyamide-cocl2-nanofibrous-membranes
#3
Ming-Hao You, Xu Yan, Jun Zhang, Xiao-Xiong Wang, Xiao-Xiao He, Miao Yu, Xin Ning, Yun-Ze Long
Humidity indicators based on composite polyamide 66/cobalt chloride (PA66/CoCl2) nanofibrous membranes (NFMs) were successfully fabricated by electrospinning. A series of NFMs with various weight percentage of CoCl2 to PA66 were prepared, and their humidity sensitivity based on color changing and quartz crystal microbalance (QCM) were studied. Due to the color change property of cobalt chloride, the as-spun composite NFMs show obviously macroscopic color change from blue to pink as relative humidity (RH) increasing from 12...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28532117/optimization-for-extracellular-biosynthesis-of-silver-nanoparticles-by-penicillium-aculeatum-su1-and-their-antimicrobial-activity-and-cytotoxic-effect-compared-with-silver-ions
#4
Liang Ma, Wei Su, Jian-Xin Liu, Xiao-Xi Zeng, Zhi Huang, Wen Li, Zheng-Chun Liu, Jian-Xin Tang
The present study addresses an eco-friendly and energy-saving method for extracellular biosynthesis of silver nanoparticles (AgNPs) using a cell free filtrate of the fungus strain Penicillium aculeatum Su1 as a reducing agent. Parametric optimization of the biosynthesis process demonstrated different effects on the size, distribution, yield, and synthesis rate of biosynthesized AgNPs. The transmission electron microscopy (TEM) measurements demonstrated that AgNPs were spherical or approximately spherical, with a size between 4 and 55nm...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532114/hypocrellin-b-and-nano-silver-loaded-polymeric-nanoparticles-enhanced-generation-of-singlet-oxygen-for-improved-photodynamic-therapy
#5
Subramanian Natesan, Venkateshwaran Krishnaswami, Chandrasekar Ponnusamy, Madi Madiyalakan, Thomas Woo, Rajaguru Palanisamy
A nanoparticulate photodynamic approach was employed with an objective to achieve enhanced production of singlet oxygen ((1)O2), for the management of posterior segment eye diseases like age related macular degeneration. The hypocrellin B (HB) loaded poly lactide-co-glycolide nanoparticle formulations were incorporated with nano silver (HBS-NPs). The optimized HBS-NPs contained 2.60±0.06mg/mL of HB and showed (i) 135.6 to 828.2nm size range, and (ii) negative zeta potential with a narrow polydispersity index...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532112/preparations-and-doxorubicin-controlled-release-of-amino-acid-based-redox-ph-dual-responsive-nanomicelles
#6
Yuanyuan Ding, Liping Zhang, Gang Shi, Xinxin Sang, Caihua Ni
Terpolymers of poly (Lysine-co-N, N-Bis (acryloyl) cystamine-co-β-Phenethylamine) (PLBP) were synthesized in one-pot by Michael addition terpolymerization. The terpolymers self-assembled into nano-sized spherical micelles (84-123nm) with narrow distributions. The surface charge of the nanomicelles (NMs) was depended on solution's pH and showed negative values under physiological conditions (pH7.4), which was beneficial for long circulation without non-specific protein adsorption. Doxorubicin (DOX) was effectively loaded into the NMs for controlled release...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532109/lactoferrin-modified-graphene-oxide-iron-oxide-nanocomposite-for-glioma-targeted-drug-delivery
#7
Meng-Meng Song, Huai-Liang Xu, Jun-Xing Liang, Hui-Hui Xiang, Rui Liu, Yu-Xian Shen
Targeting delivery of drugs in a specific manner represents a potential powerful technology in gliomas. Herein, we prepared a multifunctional targeted delivery system based on graphene oxide (GO) that contains a molecular bio-targeting ligand and superparamagnetic iron oxide nanoparticles on the surface of GO for magnetic targeting. Superparamagnetic Fe3O4 nanoparticles was loaded on the surface of GO via chemical precipitation method to form GO@Fe3O4 nanocomposites. Lactoferrin (Lf), an iron-transporting serum glycoprotein that binds to receptors overexpressed at the surface of glioma cells and vascular endothelial cell of the blood brain barrier, was chosen as the targeted ligand to construct the targeted delivery system Lf@GO@Fe3O4 through EDC/NHS chemistry...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532090/in-situ-synthesis-of-bilayered-gradient-poly-vinyl-alcohol-hydroxyapatite-composite-hydrogel-by-directional-freezing-thawing-and-electrophoresis-method
#8
Cui Su, Yunlan Su, Zhiyong Li, Muhammad Abdul Haq, Yong Zhou, Dujin Wang
Bilayered poly(vinyl alcohol) (PVA)/hydroxyapatite (HA) composite hydrogels with anisotropic and gradient mechanical properties were prepared by the combination of directional freezing-thawing (DFT) and electrophoresis method. Firstly, PVA hydrogels with aligned channel structure were prepared by the DFT method. Then, HA nanoparticles were in situ synthesized within the PVA hydrogels via electrophoresis. By controlling the time of the electrophoresis process, a bilayered gradient hydrogel containing HA particles in only half of the gel region was obtained...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532064/encapsulation-of-lactobacillus-kefiri-in-alginate-microbeads-using-a-double-novel-aerosol-technique
#9
Christian Demitri, Leonardo Lamanna, Egidio De Benedetto, Fabrizio Damiano, Maria Stella Cappello, Luisa Siculella, Alessandro Sannino
Alginate micro beads containing Lactobacillus kefiri (the principal bacteria present in the kefir probiotic drink) were produced by a novel technique based on dual aerosols spaying of alginate based solution and CaCl2 as cross linking agent. Carboxymethylcellulose (CMC) has been also added to the alginate in order to change the physic-chemical properties (viscosity and permeability) of the microbeads. Calcium alginate and CMC are biopolymers that can be used for developing oral drug-delivery systems. These biopolymers have been reported to show a pH-dependent swelling behaviour...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532040/design-synthesis-and-characterization-of-poly-methacrylic-acid-niclosamide-and-its-effect-on-arterial-function
#10
Rui Ma, Zhen-Gang Ma, Chang-Lin Zhen, Xin Shen, Shan-Liang Li, Li Li, Yu-Feng Zheng, De-Li Dong, Zhi-Jie Sun
We have found that niclosamide induced relaxation of constricted artery. However, niclosamide is insoluble, the low bioavailability and the resultant low plasma concentration limit its potential exertion in vivo. The aim of the present study is to synthesize a soluble poly (methacrylic acid-niclosamide) polymer (PMAN) and study the effects of PMAN on arterial function in vitro and the blood pressure and heart rate of rats in vivo. We synthesized the poly (methacrylic acid-niclosamide) polymer (PMAN), the chemical structure of which was identified by FTIR and (1)H NMR spectra...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532025/new-tetrahedral-zinc-halide-schiff-base-complexes-synthesis-crystal-structure-theoretical-3d-hirshfeld-surface-analyses-antimicrobial-and-thermal-studies
#11
L Taghizadeh, M Montazerozohori, A Masoudiasl, S Joohari, J M White
A new bidentate Schiff base ligand named as N,N'-bis((E)-3-phenylallylidene)butane-1,4-diamine (L) and three its zinc halide complexes were synthesized and characterized by FT-IR, (1)H NMR, (13)C NMR and UV-Vis spectroscopy. The crystal structure of zinc bromide and iodide complexes were characterized using single crystal X-ray diffraction. The two structures are isomorphous, crystallizing in the monoclinic crystal system with space group C2/c with closely similar unit cell dimensions. In these complexes, the Zn(II) ion is in the center of a distorted tetrahedral environment completed by two iminic nitrogen atoms of Schiff base ligand and two halide anions...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532020/ph-responsive-drug-release-and-real-time-fluorescence-detection-of-porous-silica-nanoparticles
#12
Xu Zhang, Yamin Wang, Yanbao Zhao, Lei Sun
In this work, pH-sensitive "dual-switch" porous silica (pSiO2) nanoparticles (NPs) were constructed for drug delivery. Poly(acrylic acid) (PAA) was grafting onto the internal and external surfaces of amino groups functionalized porous silica (pSiO2-NH2) NPs by the amidation between the amino groups and the carboxyl groups of PAA for pH triggered drug release. The resultant pSiO2/PAA NPs have an average diameter of 50-60nm and high specific surface area (914m(2)·g(-1)). To improve the loading capacity, ZnO quantum dots (QDs) were used to block the partial pores of pSiO2/PAA and the loading capacity reached to 28% for methotrexate (MTX) model drug...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532005/non-viral-strategies-for-ocular-gene-delivery
#13
REVIEW
Ana V Oliveira, Ana M Rosa da Costa, Gabriela A Silva
The success of gene therapy relies on efficient gene transfer and stable transgene expression. The in vivo efficiency is determined by the delivery vector, route of administration, therapeutic gene, and target cells. While some requirements are common to several strategies, others depend on the target disease and transgene product. Consequently, it is unlikely that a single system is suitable for all applications. This review examines current gene therapy strategies, focusing on non-viral approaches and the use of natural polymers with the eye, and particularly the retina, as their gene delivery target...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531978/quasi-static-and-ratcheting-properties-of-trabecular-bone-under-uniaxial-and-cyclic-compression
#14
Li-Lan Gao, Chao-Lei Wei, Chun-Qiu Zhang, Hong Gao, Nan Yang, Li-Min Dong
The quasi-static and ratcheting properties of trabecular bone were investigated by experiments and theoretical predictions. The creep tests with different stress levels were completed and it is found that both the creep strain and creep compliance increase rapidly at first and then increase slowly as the creep time goes by. With increase of compressive stress the creep strain increases and the creep compliance decreases. The uniaxial compressive tests show that the applied stress rate makes remarkable influence on the compressive behaviors of trabecular bone...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531970/ultrasensitive-cholesterol-biosensor-based-on-enzymatic-silver-deposition-on-gold-nanoparticles-modified-screen-printed-carbon-electrode
#15
Yong Huang, Lijie Cui, Yewei Xue, Songbai Zhang, Nixuan Zhu, Jintao Liang, Guiyin Li
Cholesterol is one of the essential structural constituents of cell membranes. Determination of cholesterol is of great importance in clinical analysis because the level of cholesterol in serum is an indicator in the diagnosis and prevention of heart diseases. In this work, a simple and ultrasensitive cholesterol biosensor based on enzymatic silver deposition was designed by immobilizing cholesterol oxidase (CHOD) and cholesterol esterase (CHER) onto the surface of gold nanoparticles (Au NPs) modified screen-printed carbon electrode (SPE)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531964/non-electron-transfer-chain-mitochondrial-defects-differently-regulate-hif-1%C3%AE-degradation-and-transcription
#16
Antonina N Shvetsova, Daniela Mennerich, Juha M Kerätär, J Kalervo Hiltunen, Thomas Kietzmann
Mitochondria are the main consumers of molecular O2 in a cell as well as an abundant source of reactive oxygen species (ROS). Both, molecular oxygen and ROS are powerful regulators of the hypoxia-inducible factor-1α-subunit (HIF-α). While a number of mechanisms in the oxygen-dependent HIF-α regulation are quite well known, the view with respect to mitochondria is less clear. Several approaches using pharmacological or genetic tools targeting the mitochondrial electron transport chain (ETC) indicated that ROS, mainly formed at the Rieske cluster of complex III of the ETC, are drivers of HIF-1α activation...
May 8, 2017: Redox Biology
https://www.readbyqxmd.com/read/28531960/multiple-stress-response-of-lowland-stream-benthic-macroinvertebrates-depends-on-habitat-type
#17
Daniel Graeber, Tinna M Jensen, Jes J Rasmussen, Tenna Riis, Peter Wiberg-Larsen, Annette Baattrup-Pedersen
Worldwide, lowland stream ecosystems are exposed to multiple anthropogenic stress due to the combination of water scarcity, eutrophication, and fine sedimentation. The understanding of the effects of such multiple stress on stream benthic macroinvertebrates has been growing in recent years. However, the interdependence of multiple stress and stream habitat characteristics has received little attention, although single stressor studies indicate that habitat characteristics may be decisive in shaping the macroinvertebrate response...
May 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28531959/occurrence-and-removal-of-pharmaceuticals-hormones-personal-care-products-and-endocrine-disrupters-in-a-full-scale-water-reclamation-plant
#18
Ngoc Han Tran, Karina Yew-Hoong Gin
This study provided the first comprehensive data on the occurrence and removal of twenty-five target emerging contaminants (ECs) in a full-scale water reclamation plant (WRP) in the Southeast Asian region. Nineteen out of the twenty-five ECs were ubiquitously detected in raw influent samples. Concentrations of the detected ECs in raw influent samples ranged substantially from 44.3 to 124,966ng/L, depending upon the compound and sampling date. The elimination of ECs in full-scale conventional activated sludge (CAS) and membrane bioreactor (MBR) systems at a local WRP was evaluated and compared...
May 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28531947/shifts-in-the-relative-abundance-of-bacteria-after-wine-lees-derived-biochar-intervention-in-multi-metal-contaminated-paddy-soil
#19
Min Xu, Hongxia Xia, Jun Wu, Gang Yang, Xiaohong Zhang, Hong Peng, Xiaoyu Yu, Li Li, Hong Xiao, Hui Qi
The impact of biochar application on soil ecological functions depends on the diversity of soil conditions and of the feedstocks from which biochar is obtained. Moreover, little information is available on the effect of biochar on dynamic changes in microorganisms with the development of rice plants in multi-metal-contaminated paddy soil amended with wine-lees-derived biochar. In this paper, biochar obtained from the pyrolysis of wine lees at 600°C was used to investigate the potential role of biochar in maintaining soil ecological functions, with consideration of the alteration of the microbial population over periods of rice growth...
May 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28531917/assessing-phytotoxicity-of-trace-element-contaminated-soils-phytomanaged-with-gentle-remediation-options-at-ten-european-field-trials
#20
Celestino Quintela-Sabarís, Lilian Marchand, Petra S Kidd, Wolfgang Friesl-Hanl, Markus Puschenreiter, Jurate Kumpiene, Ingo Müller, Silke Neu, Jolien Janssen, Jaco Vangronsveld, Ioannis Dimitriou, Grzegorz Siebielec, Rafał Gałązka, Valérie Bert, Rolf Herzig, Andrew B Cundy, Nadège Oustrière, Aliaksandr Kolbas, William Galland, Michel Mench
Gentle remediation options (GRO), i.e. in situ stabilisation, (aided) phytoextraction and (aided) phytostabilisation, were implemented at ten European sites contaminated with trace elements (TE) from various anthropogenic sources: mining, atmospheric fallout, landfill leachates, wood preservatives, dredged-sediments, and dumped wastes. To assess the performance of the GRO options, topsoil was collected from each field trial, potted, and cultivated with lettuce (Lactuca sativa L.) for 48days. Shoot dry weight (DW) yield, photosynthesis efficiency and major element and TE concentrations in the soil pore water and lettuce shoots were measured...
May 16, 2017: Science of the Total Environment
keyword
keyword
18576
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"