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https://www.readbyqxmd.com/read/29458110/investigation-of-adhesive-interactions-in-the-specific-targeting-of-triptorelin-conjugated-peg-coated-magnetite-nanoparticles-to-breast-cancer-cells
#1
Jingjie Hu, Sina Youssefian, John Obayemi, Karen Malatesta, Nima Rahbar, Winston Soboyejo
The understanding of adhesive interaction at the nanoscale between functionalized nanoparticles and biological cells is of great importance to develop effective theranostic nanocarriers for targeted cancer therapy. Here, we report a combination of experimental and computational approaches to evaluate the adhesion between Triptorelin (a Luteinizing Hormone-Releasing Hormone (LHRH) agonist)-conjugated poly-(ethylene glycol) (PEG)-coated magnetite nanoparticles (Triptorelin-MNPs) and breast cells. The adhesion forces between Triptorelin-MNPs and normal/cancerous breast cells are obtained using atomic force microscopy...
February 16, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29457974/a-multi-omics-analysis-of-glycine-max-leaves-reveals-alteration-in-flavonoid-and-isoflavonoid-metabolism-upon-ethylene-and-abscisic-acid-treatment
#2
Ravi Gupta, Cheol Woo Min, Katharina Kramer, Ganesh Kumar Agrawal, Randeep Rakwal, Ki-Hun Park, Yiming Wang, Iris Finkemeier, Sun Tae Kim
Phytohormones are central to the plant growth and development. Despite the advancement in our knowledge of hormone signaling, downstream targets and their interactions upon hormones action remain largely fragmented, especially at the protein and metabolite levels. With an aim to get new insight into the effects of two hormones, ethylene (ET) and abscisic acid (ABA), this study utilizes an integrated proteomics and metabolomics approach to investigate their individual and combined (ABA+ET) signaling in soybean leaves...
February 19, 2018: Proteomics
https://www.readbyqxmd.com/read/29457811/liquid-crystalline-behaviour-of-self-assembled-laponite%C3%A2-pll-peg-nanocomposites
#3
P Xu, Y Lan, Z Xing, E Eiser
Synthetic LAPONITE®-clay particles with platelet-like shape display strong aging when dispersed in aqueous solutions, preventing the latter from reaching their natural liquid-crystalline equilibrium state. Here we introduce a facile method that successfully prevents this aging behaviour and enables accessing the systems' liquid-crystal and crystalline phases. We graft the comb-like polymer PLL-PEG (poly(l-lysine)-g-poly(ethylene glycol)) onto the clay surfaces from solution, thereby screening the negative surface charges and thus ensuring steric stabilisation...
February 19, 2018: Soft Matter
https://www.readbyqxmd.com/read/29457690/carbon-atom-hybridization-matters-ultrafast-humidity-response-of-graphdiyne-oxides
#4
Lanqun Mao, Hailong Yan, Shuyue Guo, Fei Wu, Ping Yu, Huibiao Liu, Yuliang Li
Graphdiyne (GDY), a new kind of 2D carbon allotrope consisting of sp- and sp2-hybridized carbon atoms, has been envisaged to be promising in fundamental studies and various applications due to their unique atomic arrangement and electronic structure as well as surface chemistry. We herein for the first time find that graphdiyne oxide (GDO) exhibits an ultrafast humidity response with an unprecedented response speed (~ 7 ms), which is considered to benefit from the unique carbon hybridization of GDO that contains acetylenic bonds with stronger electron-withdrawing property than ethylenic bonds in GO...
February 19, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29457593/characterization-study-and-optimization-of-swelling-behavior-for-p-hema-co-eudragit-l-100-hydrogels-by-using-taguchi-method
#5
Hediye Irem Ozgunduz, Abdullah Bilal Ozturk, Hava Gizem Kandilci, Nil Acarali
The aim of this study is to produce the smart hydrogel to use insulin release for human body. p(HEMA-co-Eudragit L-100) hydrogels containing different ratios of 2-Hydroxyethyl methacrylate (HEMA) and Eudragait L-100 were synthesized by using ammonium persulfate (APS) as an initiator and ethylene glycol dimethacrylate (EGDMA) as a cross linker. The structures of hydrogels produced were characterized by using Fourier Transform Infrared Spectroscopy (FT-IR) and Scanning electron microscope (SEM) analysis. In this way, optimum synthesis conditions were determined for p(HEMA-co-Eudragit L-100) hydrogels by using Taguchi method as an optimization method...
2018: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/29457534/comparing-hydrogels-for-human-nucleus-pulposus-cell-regeneration-role-of-osmolarity-during-expansion
#6
Anita Krouwels, Ferry Melchels, Mattie H P Van Rijen, F Cumhur Oner, Wouter Dhert, M Tryfonidou, Laura Creemers
Hydrogels can facilitate nucleus pulposus regeneration, either for clinical application or research into mechanisms of regeneration. However, many different hydrogels and culture conditions for human degenerated nucleus pulposus (NP) have been employed, making literature data difficult to compare. Therefore, we compared six different hydrogels of natural polymers and investigated the role of serum in the medium and of osmolarity during expansion or redifferentation in an attempt to provide comparators for future studies...
February 17, 2018: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/29457380/two-step-assembly-of-thermoresponsive-gold-nanorods-coated-with-a-single-kind-of-ligand
#7
Ryo Iida, Hideyuki Mitomo, Kenichi Niikura, Yasutaka Matsuo, Kuniharu Ijiro
Gold nanorods (GNRs) coated with a single kind of ligand show thermoreponsive two-step assembly to provide a hierarchical structure. The GNRs (33 nm in length × 14 nm in diameter) coated with a hexa(ethylene glycol) (HEG) derivative form side-by-side assemblies at 30 °C (TA1 ) as a steady state through dehydration. By further heating to over 40 °C (TA2 ), larger assemblies, which are composed of the side-by-side assembled units, are formed as hierarchical structures. The dehydration temperature of the HEG derivative varies depending on the free volume of the HEG unit, which corresponds to the curvature of the GNRs...
February 19, 2018: Small
https://www.readbyqxmd.com/read/29457352/controllable-bipolar-doping-of-graphene-with-2d-molecular-dopants
#8
Boseok Kang, Haena Kim, Joong Tark Han, Dae Gun Kim, Kilwon Cho
The fine control of graphene doping levels over a wide energy range remains a challenging issue for the electronic applications of graphene. Here, the controllable doping of chemical vapor deposited graphene, which provides a wide range of energy levels (shifts up to ± 0.5 eV), is demonstrated through physical contact with chemically versatile graphene oxide (GO) sheets, a 2D dopant that can be solution-processed. GO sheets are a p-type dopant due to their abundance of electron-withdrawing functional groups...
February 19, 2018: Small
https://www.readbyqxmd.com/read/29457184/photo-controlled-fluorescence-on-off-switching-of-a-pseudo-3-rotaxane-between-an-aie-active-pillar-5-arene-host-and-a-photochromic-bithienylethene-guest
#9
Liangwei Ma, Sheng Wang, Chengpeng Li, Derong Cao, Teng Li, Xiang Ma
A fluorescence photo-switch was constructed based on a host-guest pseudo[3]rotaxane between an AIE-active pillar[5]arene host bearing tetraphenyl ethylene moieties and a photo-responsive dithienylethylene guest containing two cyano-triazole branches. Its fluorescence on/off switching could be controlled by the photochromism reaction of the dithienylethylene unit.
February 19, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29455969/application-of-response-surface-methodology-to-tailor-the-surface-chemistry-of-electrospun-chitosan-poly-ethylene-oxide-fibers
#10
Peter Bösiger, Isabelle M T Richard, Luce Le Gat, Benjamin Michen, Mark Schubert, René M Rossi, Giuseppino Fortunato
Chitosan is a promising biocompatible polymer for regenerative engineering applications, but its processing remains challenging due to limited solubility and rigid crystalline structure. This work represents the development of electrospun chitosan/poly(ethylene oxide) blend nanofibrous membranes by means of a numerical analysis in order to identify and tailor the main influencing parameters with respect to accessible surface nitrogen functionalities which are of importance for the biological activity as well as for further functionalization...
April 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29455261/phytoglobins-regulate-nitric-oxide-dependent-abscisic-acid-synthesis-and-ethylene-induced-program-cell-death-in-developing-maize-somatic-embryos
#11
Karuna Kapoor, Mohamed M Mira, Belay T Ayele, Tran-Nguyen Nguyen, Robert D Hill, Claudio Stasolla
During maize somatic embryogenesis, suppression of phytoglobins (Pgbs) reduced ABA levels leading to ethylene-induced programmed cell death in the developing embryos. These effects modulate embryonic yield depending on the cellular localization of specific phytoglobin gene expression. Suppression of Zea mays phytoglobins (ZmPgb1.1 or ZmPgb1.2) during somatic embryogenesis induces programmed cell death (PCD) by elevating nitric oxide (NO). While ZmPgb1.1 is expressed in many embryonic domains and its suppression results in embryo abortion, ZmPgb1...
February 17, 2018: Planta
https://www.readbyqxmd.com/read/29455129/comparative-study-of-volatile-organic-compounds-in-ambient-air-using-observed-mixing-ratios-and-initial-mixing-ratios-taking-chemical-loss-into-account-a-case-study-in-a-typical-urban-area-in-beijing
#12
Jian Gao, Jie Zhang, Hong Li, Lei Li, Linghong Xu, Yujie Zhang, Zhanshan Wang, Xuezhong Wang, Weiqi Zhang, Yizhen Chen, Xi Cheng, Hao Zhang, Liang Peng, Fahe Chai, Yongjie Wei
Volatile organic compounds (VOCs) can react with atmospheric radicals while being transported after being emitted, resulting in substantial losses. Using only observed VOC mixing ratios to assess VOC pollution, is therefore problematic. The observed mixing ratios and initial mixing ratios taking chemical loss into consideration were performed using data for 90 VOCs in the atmosphere in a typical urban area in Beijing in winter 2013 to gain a more accurate view of VOC pollution. The VOC sources, ambient VOC mixing ratios and compositions, variability and influencing factors, contributions to near-ground-ozone and health risks posed were assessed...
February 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29453454/a-microvascularized-tumor-mimetic-platform-for-assessing-anti-cancer-drug-efficacy
#13
Shantanu Pradhan, Ashley M Smith, Charles J Garson, Iman Hassani, Wen J Seeto, Kapil Pant, Robert D Arnold, Balabhaskar Prabhakarpandian, Elizabeth A Lipke
Assessment of anti-cancer drug efficacy in in vitro three-dimensional (3D) bioengineered cancer models provides important contextual and relevant information towards pre-clinical translation of potential drug candidates. However, currently established models fail to sufficiently recapitulate complex tumor heterogeneity. Here we present a chip-based tumor-mimetic platform incorporating a 3D in vitro breast cancer model with a tumor-mimetic microvascular network, replicating the pathophysiological architecture of native vascularized breast tumors...
February 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29453259/common-hydraulic-fracturing-fluid-additives-alter-the-structure-and-function-of-anaerobic-microbial-communities
#14
Adam C Mumford, Denise M Akob, J Grace Klinges, Isabelle M Cozzarelli
The development of unconventional oil and gas (UOG) resources results in production of large volumes of wastewater containing a complex mixture of hydraulic fracturing chemical additives and components from the formation. Release of these wastewaters into the environment poses potential risks that are poorly understood. Microbial communities in stream sediments form the base of the food chain, and may serve as sentinels for changes in stream health. Iron reducing organisms have been shown to play a role in the biodegradation of a wide range of organic compounds, and to evaluate their response to UOG wastewater, we enriched anaerobic microbial communities from sediments collected upstream (background) and downstream (impacted) of an UOG wastewater injection disposal facility in the presence of hydraulic fracturing fluid (HFF) additives: guar gum, ethylene glycol, and two biocides, DBNPA and Bronopol...
February 16, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29452844/fungal-effectors-at-the-crossroads-of-phytohormone-signaling
#15
REVIEW
Qing Shen, Yingyao Liu, Naweed I Naqvi
Phytohormone networks are crucial for maintaining the delicate balance between growth and biotic stress responses in plants. Jasmonic acid, salicylic acid, ethylene, and the associated signaling crosstalk are important for pathogen defense; whereas gibberellin and cytokinin function in growth and development in plants. Plant pathogenic fungi have evolved remarkable strategies to manipulate and/or hijack such phytohormone signaling cascades for their own benefit, thus leading to susceptibility and disease in host plants...
February 13, 2018: Current Opinion in Microbiology
https://www.readbyqxmd.com/read/29452515/intelligent-anticancer-drug-delivery-performances-of-two-poly-n-isopropylacrylamide-based-magnetite-nanohydrogels
#16
Nahid Poorgholy, Bakhshali Massoumi, Marjan Ghorbani, Mehdi Jaymand, Hamed Hamishehkar
This article evaluates the anticancer drug delivery performances of two nanohydrogels composed of poly(N-isopropylacrylamide-co-itaconic anhydride) [P(NIPAAm-co-IA)], poly(ethylene glycol) (PEG), and Fe 3 O 4 nanoparticles. For this purpose, the magnetite nanohydrogels (MNHGs) were loaded with doxorubicin hydrochloride (DOX) as a universal anticancer drug. The morphologies and magnetic properties of the DOX-loaded MNHGs were investigated using transmission electron microscopy (TEM) and vibrating-sample magnetometer (VSM), respectively...
February 16, 2018: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/29451803/fluoroethylene-carbonate-induces-ordered-electrolyte-interface-on-silicon-and-sapphire-surfaces-as-revealed-by-sum-frequency-generation-vibrational-spectroscopy-and-x-ray-reflectivity
#17
Yonatan Horowitz, Hans-Georg Steinrück, Hui-Ling Han, Chuntian Cao, Iwnetim Iwnetu Abate, Yuchi Tsao, Michael F Toney, Gabor A Somorjai
The cyclability of silicon anodes in lithium ion batteries (LIBs) is affected by the reduction of the electrolyte on the anode surface to produce a coating layer termed the solid electrolyte interphase (SEI). One of the key steps for a major improvement of LIBs is unraveling the SEI's structure-related diffusion properties as charge and discharge rates of LIBs are diffusion-limited. To this end, we have combined two surface sensitive techniques, sum frequency generation (SFG) vibrational spectroscopy and X-ray reflectivity (XRR), to explore the first monolayer and to probe the first several layers of electrolyte, respectively, for solutions consisting of 1M lithium perchlorate (LiClO 4 ) salt dissolved in ethylene carbonate (EC) or fluoroethylene carbonate (FEC) and their mixtures (EC:FEC 7:3 and 1:1 wt%) on silicon and sapphire surfaces...
February 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/29451128/signal-amplifying-nanoparticle-hydrogel-hybrid-microarray-biosensor-for-metal-enhanced-fluorescence-detection-of-organophosphorus-compounds
#18
Minsu Kim, Kangwon Lee, Ji Eon Kwon, Won Gun Koh
In this study, we developed an enzyme-based miniaturized fluorescence biosensor to detect paraoxon, one of the most well-known neurotoxic organophosphorus compounds (OPs). The biosensor was fabricated with poly(ethylene glycol) (PEG) hydrogel microarrays that entrapped acetylcholinesterase (AChE) and quantum dots (QDs) as fluorescence reporters. Metal-enhanced fluorescence (MEF) was utilized to amplify the fluorescence signal, which was achieved by decorating QDs on the surface of silica-coated silver nanoparticles (Ag@Silica)...
February 16, 2018: Biofabrication
https://www.readbyqxmd.com/read/29451126/fabrication-of-ultrathin-multilayered-superomniphobic-nanocoatings-by-liquid-flame-spray-atomic-layer-deposition-and-silanization
#19
Miika Sorvali, Leena Vuori, Marko Pudas, Janne Haapanen, Riitta Mahlberg, Helena Ronkainen, Mari Honkanen, Mika Valden, Jyrki Mäkelä
Superomniphobic, i.e. liquid-repellent, surfaces have been an interesting area of research during the last decade due to their various potential applications. However, producing such surfaces, especially on hard and resilient substrates like stainless steel, still remains challenging. We present a stepwise fabrication process of a multilayered nanocoating on a stainless steel substrate, consisting of a nanoparticle layer, a nanofilm and a layer of silane molecules. Liquid flame spray (LFS) was used to deposit a TiO2 nanoparticle layer on the bottom for producing a suitable surface structure...
February 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29450412/clinically-approved-liposomal-nanomedicines-lessons-learned-from-the-biomolecular-corona
#20
Giulio Caracciolo
Nowadays, liposomes are the most successful drug delivery systems with a dozen drug products available in the clinic. Grafting poly-(ethylene glycol) (PEG) onto the liposome surface prevents protein binding thus prolonging blood circulation, while synthetic modification of the terminal PEG molecule with ligands (e.g. monoclonal antibodies and peptides) should promote selective accumulation in the tumor region with respect to healthy tissues. However, despite big efforts, advances have not outgrown the development stage and just a few targeted liposomal drugs are commercially available...
February 16, 2018: Nanoscale
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