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Jenny Tempeler, Serhiy Danylyuk, Sascha Brose, Peter Loosen, Larissa Juschkin
In this study we analyze the impact of process and growth parameters on the structural properties of germanium (Ge) quantum dot arrays. The arrays were deposited by molecular beam epitaxy on pre-patterned silicon (Si) substrates. Periodic arrays of pits with diameters between 120 nm to 20 nm and pitches ranging from 200 nm down to 40 nm were etched into the substrate prior to growth. The structural perfection of the 2-dimensional quantum dot (QD) arrays was evaluated based on SEM images. The impact of two processing steps on the directed self-assembly of Ge QD arrays is investigated...
April 18, 2018: Nanotechnology
Wenxiu Liu, Lili Yin, Rui Zhang, Hailian Yang, Jing Ma, Wenbin Cao
3D hierarchical SnO architectures were synthesized via a one-step dissolution-precipitation route under room temperature using SnCl22H2O and Na2CO3 as initial reagents. The morphology and size of the prepared SnO structures could be easily tailored by alternating the solvent from deionized water with absolute ethanol. The SEM observation shows that the prepared 3D SnO hierarchical architectures were consisted of nanosheets. And the size of the SnO hierarchical architectures could be effectively reduced from 4 - 10 μm to 1 - 2 μm when the solvent was changed from water to ethanol while the thickness of the assembling nanosheets will be reduced from 200 - 500 nm to 20 - 30 nm at the same time...
April 18, 2018: Nanotechnology
Xiaoxian Song, Hanbo Yu, Xianju Yan, Yuewei Zhang, Yang Miao, Kaiqi Ye, Yue Wang
Herein, a new bis(salicylaldiminato)Zn(ii) Schiff base complex, BTZn, derived from benzo[c][1,2,5]thiadiazole-5,6-diamine was designed and synthesized. It exhibited unique mechanical force-induced luminescence change characteristic. Upon mechanical grinding, the as-prepared BTZn solid crystalized from an ethanol/dichloromethane solution displays a high-contrast emission-colour variation from yellow (emission maximum λem = 545 nm) to red (λem = 645 nm), and this emission variation can be erased through solvent vapour treatment...
April 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Ghazna Zia, Haleema Sadia, Shabnam Nazir, Kiren Ejaz, Shaukat Ali, Ihsan-Ul-Haq, Tariq Iqbal, Muhammad Abdul Rauf Khan, Abida Raza, Saiqa Andleeb
BACKGROUND: Many health hazardous diseases are caused by clinical pathogens. Drug-resistant microbes are one of the major health problems in the world. To overcome the effect of infectious diseases new antimicrobial agent from nature has been explored which is environmentally friendly, less costly and more effective for the development of next-generation drugs. Bergenia ciliata and silver nitrate both have medicinal properties. OBJECTIVES: The aim of the current research was to evaluate the cytotoxic, and antibacterial effect of green synthesized nanoparticles using Bergenia ciliata rhizome against clinical bacterial pathogens...
April 17, 2018: Current Pharmaceutical Biotechnology
Munmun Banerjee, Ranjan Kumar Basu, Sudip Kumar Das
Cu(II) adsorption in continuous column using green adsorbents like peanut and almond shell was investigated. Fourier transform infrared (FTIR) spectroscopy, Brunaer-Emmett-Teller (BET) analysis, scanning electron microscopy (SEM), and Point of Zero charge (pHpzc ) determination have been used for characterization of the adsorbents. Experiments were conducted at various operating conditions to calculate the adsorption capacity of the adsorbents. Adsorption studies signify that both the adsorbents have good adsorptive capacity for Cu(II) ion...
April 17, 2018: Environmental Science and Pollution Research International
Patricia M Valdespino-Castillo, Ping Hu, Martín Merino-Ibarra, Luz M López-Gómez, Daniel Cerqueda-García, Roberto González-De Zayas, Teresa Pi-Puig, Julio A Lestayo, Hoi-Ying Holman, Luisa I Falcón
Microbialites are modern analogs of ancient microbial consortia that date as far back as the Archaean Eon. Microbialites have contributed to the geochemical history of our planet through their diverse metabolic capacities that mediate mineral precipitation. These mineral-forming microbial assemblages accumulate major ions, trace elements and biomass from their ambient aquatic environments; their role in the resulting chemical structure of these lithifications needs clarification. We studied the biogeochemistry and microbial structure of microbialites collected from diverse locations in Mexico and in a previously undescribed microbialite in Cuba...
2018: Frontiers in Microbiology
Aleksandra Zielonka, Ewa Żymańczyk-Duda, Małgorzata Brzezińska-Rodak, Maciej Duda, Jakub Grzesiak, Magdalena Klimek-Ochab
Rice husks (RHs) are plant waste materials abundant in phytoliths silica bodies. These were used as starting material for fungal-mediated biotransformation leading to the synthesis of a high-value added product. A strain of Aspergillus parasiticus was capable of transforming the amorphous silica conglomerates into structured nanoparticles (NPs) in the process of RHs biotransformation. Silica NPs were produced extracellularly and their size ranged from 3 to 400 nm depending on the biotransformation conditions and the post-biotransformation supernatant processing...
May 2018: Fungal Biology
Yingying Shao, Pin Zhao, Qinyan Yue, Yuwei Wu, Baoyu Gao, Wenjia Kong
Wheat straw-supported Nanoscale Zero-Valent Iron particles (WS-NZVI) were successfully synthesized, which were used for Ciprofloxacin hydrochloride (CIP) removal in simulation wastewater. The structure, chemical composition and micro-morphology of WS-NZVI and Nanoscale Zero-Valent Iron (NZVI) were characterized by scanning electron microscopy analysis (SEM), X-ray diffraction (XRD), as well as the Fourier Transformed IR spectra (FT-IR). XRD results proved the existence of Fe°, and SEM images indicated that the agglomeration of NZVI was effectively inhibited when loaded on wheat straw...
April 14, 2018: Ecotoxicology and Environmental Safety
Emanuela Pignotti, Roberta Guerra, Stefano Covelli, Elena Fabbri, Enrico Dinelli
Sediments from the Pialassa Piomboni coastal lagoon (NE Italy) were studied to assess the degree of contamination and ecological risk related to trace metals by combining a geochemical characterization of bulk sediments with the assessment of the bioavailable forms of trace metals. With this purpose, sediment contamination (Cd, Cu, Hg, Ni, Pb, and Zn) was assessed by Enrichment Factors (EFs), and potential bioavailability by the Simultaneously Extracted Metals and Acid Volatile Sulfides (SEM-AVS) approach (Cd, Cu, Ni, Pb, and Zn), and by Sequential Extraction Procedure (Co, Cr, Cu, Ni, Pb, and Zn)...
April 13, 2018: Science of the Total Environment
Shixin Fang, Guangjian Wang, Pengcheng Li, Ronge Xing, Song Liu, Yukun Qin, Huahua Yu, Xiaolin Chen, Kecheng Li
A new superabsorbent polymer was synthesized using amino ethyl chitosan and an acrylic acid by a free radical polymerization. The chemical structure of the superabsorbent polymer was characterized using FTIR, TGA, XRD and solid-state 13 C NMR. The results revealed that the acrylic acid was successfully grafted onto the amino ethyl chitosan backbone. As revealed by SEM, a surface with homogeneous and interconnected pore structure was obtained. The influences of different factors (e.g., the initiator, cross-linker and monomer) on the water absorbency of the superabsorbent polymers were investigated...
April 14, 2018: International Journal of Biological Macromolecules
Monique Costa Moreira França, Tânia Mara Da Silva, Gleyce Oliveira Silva, Márcia Carneiro Valera, Carlos Henrique Ribeiro Camargo
BACKGROUND/AIMS: Dental root cell proliferation following tooth avulsion has not been well researched. Understanding the effects of dry time and dentin treatment influences on cell proliferation is essential to provide evidence-based guidelines for tooth replantation. The study evaluated the viability of periodontal ligament fibroblasts (PLF) in contact with roots, submitted to surface treatments with EDTA and hyaluronic acid (HA) at different times, including to quantify inflammatory cytokines IL-6, IL-8, IL-1β and TNF-α expressed by PLF...
April 17, 2018: Dental Traumatology: Official Publication of International Association for Dental Traumatology
Jyotsna Joshi, Gautam Mahajan, Chandrasekhar R Kothapalli
Endogenous adult cardiac regenerative machinery is not capable of replacing the lost cells following myocardial infarction, often leading to permanent alterations in structure-function-mechanical properties. Regenerative therapies based on delivering autologous stem cells within an appropriate 3D milieu could meet such demand, by enabling homing and directed differentiation of the transplanted cells into lost specialized cell populations. Since type I collagen is the predominant cardiac tissue matrix protein, we here optimized the 3D niche which could promote time-dependent evolution of cardiomyogenesis from human bone marrow-derived mesenchymal stem cells (BM-MSC)...
April 17, 2018: Biotechnology and Bioengineering
Nasren Eiza, Eli Zuckerman, Matthias Carlebach, Tova Rainis, Yair Goldberg, Zahava Vadasz
BACKGROUND: B regulatory (Breg) cells are characterized by various membrane markers, and the secretion of different inhibitory cytokines. A new subset of Breg cells was identified as CD5hi Fas-ligand (FasL)hi. Their main reported role is to suppress anti-viral and anti-tumor immune responses and hence, they have been dubbed "killer" B cells. In this study, we aim to assess the role of these cells in chronic hepatitis C virus (HCV) infection, and determine if they contribute to the increased viral load and persistence of HCV and its related autoimmunity...
April 17, 2018: Clinical and Experimental Immunology
Gergely Nagymáté, Zsanett Orlovits, Rita M Kiss
Recent studies have suggested reduced independent and sensitive parameter sets for stabilometry measurements based on correlation and variance analyses. However, the reliability of these recommended parameter sets has not been studied in the literature or not in every stance type used in stabilometry assessments, for example, single leg stances. The goal of this study is to evaluate the test-retest reliability of different time-based and frequency-based parameters that are calculated from the center of pressure (CoP) during bipedal and single leg stance for 30- and 60-second measurement intervals...
2018: PloS One
Yulong Zhang, Zhong Zheng, Mengliu Yu, Chinyun Hsu, Emily Berthiaume, Hsinchuan Pan, Xinli Zhang, Adam Z Stieg, Benjamin Wu, Huiming Wang, Kang Ting, Chia Soo
Successful osseointegration of orthopaedic and orthodontic implants is dependent on a competition between osteogenesis and bacterial contamination on the implant-tissue interface. Previously, by taking advantage of the highly interactive capabilities of silver nanoparticles (AgNPs), we effectively introduced an antimicrobial effect to metal implant materials using a AgNP/poly(DL-lactic-co-glycolic acid) (PLGA) coating. Although electrical forces have been shown to promote osteogenesis, creating practical materials and devices capable of harnessing these forces to induce bone regeneration remains challenging...
April 17, 2018: ACS Applied Materials & Interfaces
Saeed Zahiri, Elahe Masaeli, Elahe Poorazizi, Mohammad Hossein Nasr-Esfahani
Current studies based on regenerative medicine suggest, decellularized extracellular matrix (DC-ECM) components can regulate cell phenotype. In this regard, it is believed, presence of cartilage extracellular matrix particles in culture condition could produce physical and biochemical supportive cues for chondrogenesis. In this study, DC-ECM nanoparticles with average size of 61.5± 22.4 nm were produced by decellularization and mechanical processing. Homogenous distribution and nano scale size of yield particles were observed by Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) microscopy imaging...
April 17, 2018: Journal of Biomedical Materials Research. Part A
Yujie Tan, Mengqin Gu, Wangyang Li, Ling Guo
The objectives were to evaluate the efficacy of a filled adhesive named Prime & Bond NT (P&B NT) as the dentin desensitizer in occluding fluorosis dentinal tubules and compare the shear bond strength (SBS) of RelyX U200 self-adhesive resin cement (RXU) and RelyX Luting self-adhesive resin-modified glass ionomer cement (RMGIC) before and after P&B NT pretreatment. 176 non-carious fluorosis were classified into four subgroups by the Thylstrup and Fejerskov index (TFI): normal group (TFI = 0), mild group (TFI = 1-3), moderate group (TFI = 4-5), severe group (TFI = 6-9)...
April 17, 2018: Microscopy Research and Technique
Reny C Dos Reis Nagano, Daniela A Biasotto-Gonzalez, Gilmar L da Costa, Karina M Amorim, Marco A Fumagalli, César F Amorim, Fabiano Politti
OBJECTIVE: The aim of this study was to evaluate the reliability of the different dynamometric variables of the pelvic floor muscles (PFM) in healthy women during the menstrual cycle. MATERIALS AND METHODS: The collections of the PFM contractions of 20 healthy were performed over three consecutive weeks from the first day after the end of the menstrual period. The baseline, peak time, maximum PFM strength value, impulse of contraction, and average contraction force were calculated and the reproducibility tested...
April 17, 2018: Neurourology and Urodynamics
Yunhui Yan, Tianjun Ni, Jinge Du, Li Li, Shuai Fu, Kun Li, Jianguo Zhou
A novel BiVO4/BiPO4 composite with a balsam pear-shaped morphology was fabricated by a green hydrothermal synthesis approach, which didn't employ a strong acid and base, and neither a template or surfactant. The co-precipitation hydrothermal process had significant influence not only on particle size and shape, but also on the BiVO4 oriented growth along the (040) facet. The morphology, microstructure, light absorption and emission properties were analyzed by several characterization techniques. A formation mechanism for the hollow BiVO4/BiPO4 composite was proposed on the basis of time-dependent SEM observations...
April 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Fazal Khan, Musab Aldhahri, Mohammad Asif Hussain, Kalamegam Gauthaman, Adnan Memic, Adel Abuzenadah, Taha Kumosani, Elie Barbour, Nazeeh Shuja Alothmany, Rabah Wasil Aldhaheri
Side effects connected with chemotherapeutic agents used in cancer treatment has led to alternative modalities of combinatorial therapies in an attempt to reduce the drug dosage and associated risks. In the current study we evaluated the potential use of Ajwa Dates Extract (ADE), reported to have anti-cancer effects, as an adjuvant therapy in combination with 5-flurouracil (5FU) against the human-breast-adenocarcinoma cell line (MFC-7) in vitro. The effects of ADE alone and in combination with 5-FU were evaluated in terms of cell viability and cytotoxicity...
March 1, 2018: Journal of Biomedical Nanotechnology
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