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https://www.readbyqxmd.com/read/29332272/comparative-study-of-selenium-and-selenium-nanoparticles-with-reference-to-acute-toxicity-biochemical-attributes-and-histopathological-response-in-fish
#1
Neeraj Kumar, Kishore Kumar Krishnani, Narendra Pratap Singh
Recent studies have demonstrated that selenium (Se) and selenium nanoparticles (Se-NPs) exhibited toxicity at a higher concentration. The lethal concentration of Se and Se-NPs was estimated as 5.29 and 3.97 mg/L at 96 h in Pangasius hypophthalmus. However, the effect of different definite concentration of Se (4.5, 5.0, 5.5, and 6.0 mg/L) and Se-NPs (2.5, 3.0, 3.5, and 4.0 mg/L) was decided for acute experiment. Selenium and Se-NPs alter the biochemical attributes such as anti-oxidative status [catalase (CAT), superoxide dismutase (SOD), and glutathione-S-transferase (GST) activities], neurotransmitter enzyme, cellular metabolic enzymes, stress marker, and histopathology of P...
January 13, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29331892/dynamic-probabilistic-material-flow-analysis-of-nano-sio2-nano-iron-oxides-nano-ceo2-nano-al2o3-and-quantum-dots-in-seven-european-regions
#2
Yan Wang, Bernd Nowack
Static environmental exposure assessment models based on material flow analysis (MFA) have previously been used to estimate flows of engineered nanomaterials (ENMs) to the environment. However, such models do not account for changes in the system behavior over time. Dynamic MFA used in this study includes the time-dependent development of the modelling system by considering accumulation of ENMs in stocks and the environment, and the dynamic release of ENMs from nano-products. In addition, this study also included regional variations in population, waste management systems, and environmental compartments, which subsequently influence the environmental release and concentrations of ENMs...
January 11, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29331779/superior-peroxidase-mimetic-activity-of-tungsten-disulfide-nanosheets-silver-nanoclusters-composite-colorimetric-fluorometric-and-electrochemical-studies
#3
Alireza Khataee, Mahsa Haddad Irani-Nezhad, Javad Hassanzadeh, Sang Woo Joo
Developing a novel peroxidase nano-mimetic is a challenging research topic in biosensing field. Herein, WS2 nanosheets (WS2 NS) decorated with silver nanoclusters (AgNCs) was introduced as a new nanocomposite with improved peroxidase mimetic behavior. WS2 NS/AgNCs nanocomposite was synthesized by simple chemical reduction of silver cations in the presence of WS2 NS. The enhanced catalytic activity of nanocomposite in chemical and electrochemical reduction of H2O2 was studied using colorimetry, fluorometry and electrochemical techniques...
January 4, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29331725/bivo4-n-rgo-nano-composites-as-highly-efficient-visible-active-photocatalyst-for-the-degradation-of-dyes-and-antibiotics-in-eco-system
#4
Brindha Appavu, Sivakumar Thiripuranthagan, Sudhakar Ranganathan, Elangovan Erusappan, Kathiravan Kannan
Herein, we report the synthesis of novel nitrogen doped reduced graphene oxide/ BiVO4 photo catalyst by single step hydrothermal method. The physicochemical properties of the catalysts were characterized using XRD, N2 adsorption-desorption, Raman, XPS, SEM TEM, DRS-UV and EIS techniques. The synthesized catalysts were tested for their catalytic activity in the photo degradation of some harmful textile dyes (methylene blue & congo red) and antibiotics (metronidazole and chloramphenicol) under visible light irradiation...
January 10, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29331620/antagonistic-effect-of-nano-zno-and-cetyltrimethyl-ammonium-chloride-on-the-growth-of-chlorella-vulgaris-dissolution-and-accumulation-of-nano-zno
#5
Na Liu, Yipeng Wang, Fei Ge, Shixiang Liu, Huaixian Xiao
The interaction of nanoparticles with coexisting chemicals affects the fate and transport of nanoparticles, as well as their combined effects on aquatic organisms. Here, we evaluated the joint effect of ZnO nanoparticle (nano-ZnO) and cetyltrimethyl ammonium chloride (CTAC) on the growth of Chlorella vulgaris and explored the possible mechanism. Results showed that an antagonistic effect of nano-ZnO and CTAC (0.1, 0.2 and 0.3 mg L-1) was found because CTAC stop nano-ZnO being broken down into solution zinc ions (Zn2+)...
December 29, 2017: Chemosphere
https://www.readbyqxmd.com/read/29331537/preparation-of-acetylated-nanofibrillated-cellulose-from-corn-stalk-microcrystalline-cellulose-and-its-reinforcing-effect-on-starch-films
#6
Li Cheng, Dongli Zhang, Zhengbiao Gu, Zhaofeng Li, Yan Hong, Caiming Li
Acetylated nanofibrillated cellulose (ANFC) with different degrees of substitution (DS) was prepared from corn-stalk microcrystalline cellulose (MCC) using chemical-mechanical combined processes. The physicochemical properties of nanofibrillated cellulose (NFC) and ANFC were investigated together with the influence of added nanoparticles on the mechanical properties of starch films. The acetylation reaction was monitored by Fourier transform infrared (FT-IR) and titration. Particle size and morphological of NFC and ANFC were studied by atomic force microscope (AFM)...
January 10, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29331522/nanos3-not-nanos1-and-nanos2-is-a-germ-cell-marker-gene-in-large-yellow-croaker-during-embryogenesis
#7
Kunhuang Han, Shihai Chen, Mingyi Cai, Yonghua Jiang, Ziping Zhang, Yilei Wang
In this study, three nanos gene subtypes (Lcnanos1, Lcnanos2 and Lcnanos3) from Larimichthys crocea, were cloned and characterized. We determined the spatio-temporal expression patterns of each subtype in tissues as well as the cellular localization of mRNA in embryos. Results showed that deduced Nanos proteins have two main homology domains: N-terminal CCR4/NOT1 deadenylase interaction domain and highly conserved carboxy-terminal region bearing two conserved CCHC zinc-finger motifs. The expression levels of Lcnanos1 in testis were significantly higher than other tissues, followed by heart, brain, eye, and ovary...
January 10, 2018: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/29331291/global-microrna-profiling-in-human-bone-marrow-skeletal-stromal-or-mesenchymal-stem-cells-identified-candidates-for-bone-regeneration
#8
Chi-Chih Chang, Morten T Venø, Li Chen, Nicholas Ditzel, Dang Q S Le, Philipp Dillschneider, Moustapha Kassem, Jørgen Kjems
Bone remodeling and regeneration are highly regulated multistep processes involving posttranscriptional regulation by microRNAs (miRNAs). Here, we performed a global profiling of differentially expressed miRNAs in bone-marrow-derived skeletal cells (BMSCs; also known as stromal or mesenchymal stem cells) during in vitro osteoblast differentiation. We functionally validated the regulatory effects of several miRNAs on osteoblast differentiation and identified 15 miRNAs, most significantly miR-222 and miR-423, as regulators of osteoblastogenesis...
December 5, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/29330582/nano-silicon-alters-antioxidant-activities-of-soybean-seedlings-under-salt-toxicity
#9
Salar Farhangi-Abriz, Shahram Torabian
Materials with a particle size less than 100 nm are classified as nano-materials. The physical and chemical properties of nano-materials can vary considerably from those of bulk materials of the same composition. Silicon (Si) still fails to get recognized as an essential nutrient for plant growth and development, however the beneficial effects in terms of growth, biotic and abiotic stress resistance have been indicated in a variety of plant species for their growth. The aim of this study was to investigate the effects of different nano-silicon rates on the growth and antioxidant activities of soybean (Glycine max L...
January 12, 2018: Protoplasma
https://www.readbyqxmd.com/read/29330203/personalized-rna-medicine-for-pancreatic-cancer
#10
Maud-Emmanuelle Gilles, Liangliang Hao, Ling Huang, Rajesha Rupaimoole, Pedro P Lopez-Casas, Emilia Pulver, Jong Cheol Jeong, Senthil K Muthuswamy, Manuel Hidalgo, Sangeeta N Bhatia, Frank J Slack
PURPOSE: Since drug responses vary between patients, it is crucial to develop pre-clinical or co-clinical strategies that forecast patient response. In this study, we tested whether RNA-based therapeutics were suitable for personalized medicine by using patient-derived-organoid (PDO) and patient-derived-xenograft (PDX) models.  Experimental Design: We performed microRNA (miRNA) profiling of PDX samples to determine the status of miRNA deregulation in individual pancreatic ductal adenocarcinoma (PDAC) patients...
January 12, 2018: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/29329995/multifunctional-hybrid-graphene-oxide-for-circulating-tumor-cell-isolation-and-analysis
#11
Avijit PramaniK, Stacy Jones, Ye Gao, Carrie Sweet, Aruna Vangara, Salma Begum, Paresh Chandra Ray
Even in 21st century, >90% cancer-associated deaths are caused by metastatic disease. Circulating tumor cells (CTCs), which circulate in the blood stream after release from primary tumors, extravasate and form fatal metastases in different organs. Several clinical trials indicate that CTCs can be used as a liquid biopsy of tumors for early diagnosis of cancers. Since CTCs are extremely rare and exhibit heterogeneous biology due to epithelial-mesenchymal transition (EMT), oncologists continue to face enormous challenges in using CTCs as a true "liquid biopsy" for cancer patients...
January 9, 2018: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/29329816/structural-polymorphism-of-a-cytosine-rich-dna-sequence-forming-i-motif-structure-exploring-ph-based-biosensors
#12
Saami Ahmed, Mahima Kaushik, Swati Chaudhary, Shrikant Kukreti
Sequence recognition and conformational polymorphism enable DNA to emerge out as a substantial tool in fabricating the devices within nano-dimensions. These DNA associated nano devices work on the principle of conformational switches, which can be facilitated by many factors like sequence of DNA/RNA strand, change in pH or temperature, enzyme or ligand interactions etc. Thus, controlling these DNA conformational changes to acquire the desired function is significant for evolving DNA hybridization biosensor, used in genetic screening and molecular diagnosis...
January 9, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29329077/nano-hydroxyapatite-blasted-titanium-surface-creates-a-biointerface-able-to-govern-src-dependent-osteoblast-metabolism-as-prerequisite-to-ecm-remodeling
#13
Célio J C Fernandes, Fábio Bezerra, Marcel R Ferreira, Amanda F C Andrade, Thais Silva Pinto, Willian F Zambuzzi
Over the last several years, we have focused on the importance of intracellular signaling pathways in dynamically governing the biointerface between pre-osteoblast and surface of biomaterial. Thus, this study investigates the molecular hallmarks involved in the pre-osteoblast relationship with different topography considering Machined (Mc), Dual Acid-Etching (DAE), and nano hydroxyapatite-blasted (nHA) groups. There was substantial differences in topography of titanium surface, considering Atomic Force Microscopy and water contact angle (Mc = 81...
December 28, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29328276/femto-nano-second-switchable-passively-mode-locked-fiber-laser-with-analytic-modeling-by-the-cubic-quintic-ginzburg-landau-equation
#14
Wen-Hsuan Kuan, Li-Ting Kao, Jing-Yun Wang, Kuei-Huei Lin
We report a passively mode-locked erbium-doped fiber laser with pulse widths switchable from 473 fs to 76.8 ns, where the fundamental mode-locking, noise-like pulse, nanosecond mode-locking, and dual-width mode-locking (DML) are obtained by adjusting a polarization controller. Co-existence of femto- and nano-second pulses in DML is attributed to the gain balancing. Analytic modeling of the fiber laser with the cubic-quintic Ginzburg-Landau equation is presented, in which the pulse widths are calculated as functions of dispersion, self-phase modulation (SPM), cubic saturable absorption (SA), and quintic SA...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328273/optothermal-control-of-gains-in-erbium-doped-whispering-gallery-microresonators
#15
Xiao-Fei Liu, Tie-Jun Wang, Chuan Wang
Erbium-doped whispering-gallery-mode (WGM) microcavities have great potential in many important applications, such as the precision detection and the micro/nano laser. However, they are sensitive to the fluctuations from the pump laser and the environment. Here we demonstrate the precise controlling of transmission spectra and optical gains using optothermal scanning methods in erbium-doped WGM microcavities. The transmission spectrum of the probe signal exhibits the transition between asymmetric Fano-like resonance and the Lorentz peak (or dip) through tuning the input frequency and the scanning speed of the pump laser...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328189/massive-ordering-and-alignment-of-cylindrical-micro-objects-by-photovoltaic-optoelectronic-tweezers
#16
Iris Elvira, Juan F Muñoz-Martínez, Álvaro Barroso, Cornelia Denz, José B Ramiro, Angel García-Cabañes, Fernando Agulló-López, Mercedes Carrascosa
Optical tools for manipulation and trapping of micro- and nano-objects are a fundamental issue for many applications in nano- and biotechnology. This work reports on the use of one such method, known as photovoltaic optoelectronics tweezers, to orientate and organize cylindrical microcrystals, specifically elongated zeolite L, on the surface of Fe-doped LiNbO3 crystal plates. Patterns of aligned zeolites have been achieved through the forces and torques generated by the bulk photovoltaic effect. The alignment patterns with zeolites parallel or perpendicular to the substrate surface are highly dependent on the features of light distribution and crystal configuration...
January 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328155/fast-switching-optically-isotropic-liquid-crystal-nano-droplets-with-improved-depolarization-and-kerr-effect-by-doping-high-k-nanoparticles
#17
Byeonggon Kim, Hyun Gyu Kim, Gyu-Yeop Shim, Ji-Sub Park, Kyung-Il Joo, Dong-Jin Lee, Joun-Ho Lee, Ji-Ho Baek, Byeong Koo Kim, Yoonseuk Choi, Hak-Rin Kim
We proposed and analyzed an optically isotropic nano-droplet liquid crystal (LC) doped with high k nanoparticles (NPs), exhibiting enhanced Kerr effects, which could be operated with reduced driving voltages. For enhancing the contrast ratio together with the light efficiencies, the LC droplet sizes were adjusted to be shorter than the wavelength of visible light to reduce depolarization effects by optical scattering of the LC droplets. Based on the optical analysis of the depolarization effects, the influence of the relationship between the LC droplet size and the NP doping ratio on the Kerr effect change was investigated...
January 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328061/spontaneous-nano-gap-formation-in-ag-film-using-nacl-sacrificial-layer-for-raman-enhancement
#18
Kyungchan Min, Wook Jin Jeon, Youngho Kim, Jae-Young Choi, Hak Ki Yu
We report the method of fabrication of nano-gap (known as hot spots) in Ag thin film using sodium chloride (NaCl) sacrificial layer for Raman enhancement. The Ag thin film (20 ~ 50 nm) on the NaCl sacrificial layer undergoes an interfacial reaction due to the AgCl formed at the interface during water molecule intercalation. The intercalated water molecules can dissolve the NaCl molecules at interfaces and form the ionic state of Na+ and Cl-, promoting the AgCl formation. The Ag atoms can migrate by the driving force of this interfacial reaction, resulting in the formation of nano-size gaps in the film...
January 12, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29327915/multispectral-atomic-force-microscopy-infrared-nano-imaging-of-malaria-infected-red-blood-cells
#19
David Perez-Guaita, Kamila Kochan, Mitchell Batty, Christian Doerig, Jose Garcia-Bustos, Shirley Josefina Espinoza Herrera, Don McNaughton, Philip Heraud, Bayden R Wood
Atomic Force Microscopy-Infrared (AFM-IR) spectroscopy is a powerful new technique that can be applied to study molecular composition of cells and tissues at the nano-scale. AFM-IR maps are acquired using single wavenumber value: they show either the absorbance plotted against a single wavenumber value, or a ratio of two absorbance values. Here we implement multivariate image analysis to generate multivariate AFM-IR maps, and use this approach to resolve subcellular structural information in red blood cells infected with Plasmodium falciparum at different stages of development...
January 12, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29327746/silk-nanoparticles-from-inert-supports-to-bioactive-natural-carriers-for-drug-delivery
#20
REVIEW
Barbara Crivelli, Sara Perteghella, Elia Bari, Milena Sorrenti, Giuseppe Tripodo, Theodora Chlapanidas, Maria Luisa Torre
Silk proteins have been studied and employed for the production of drug delivery (nano)systems. They show excellent biocompatibility, controllable biodegradability and non-immunogenicity and, if needed, their properties can be modulated by blending with other polymers. Silk fibroin (SF), which forms the inner core of silk, is a (bio)material officially recognized by the Food and Drug Administration for human applications. Conversely, the potential of silk sericin (SS), which forms the external shell of silk, could still be considered under evaluation...
January 12, 2018: Soft Matter
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