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Zinc oxide

Samaneh Kameli, Ali Mehrizad
Recent improvements based on heterojunction nanocomposites have opened new possibilities in photocatalysis. In this research, an ultrasound assisted co-precipitation method was used to fabricate silver, zinc sulfide, and reduced graphene oxide (Ag-ZnS/rGO) nanocomposite, and characterization results indicated that 3% Ag-ZnS spherical nanoparticles are successfully embedded in rGO matrix. The potential of the Ag-ZnS/rGO, as a visible light active photocatalyst, was assessed through optimizing degradation of Tetracycline (TC) by response surface methodology...
August 14, 2018: Photochemistry and Photobiology
Ruixing Liu, Xiaoming Yan
The aim of the present study was to examine whether activation of the nuclear factor E2‑related factor 2 (Nrf‑2)/heme oxygenase‑1 (HO‑1) antioxidant pathway in the cornea was involved in the protective effect of sulforaphane (SF) following keratoconus (KC) injury. Following epithelial debridement, collagenase type II was applied in KC groups at room temperature for 30 min. Following this, rabbits were administered with a subconjunctival (s.c.) injection of SF or placebo (maize oil) daily for a total of 2 weeks...
August 10, 2018: International Journal of Molecular Medicine
Kirubaveni Savarimuthu, Radha Sankararajan, Rajamanickam Govindaraj, Santhosh Narendhiran
Vibration based piezoelectric energy harvesting from unused ambient sources is an efficient approach for a battery-free, sustainable and green power source for self-powered electronics. This paper presents the performance enhancement of a p-n junction based flexible nano-generator (NG). A stable, non-hazardous spiro and zinc oxide (ZnO) p-n junction based NG is proposed. The device performance is compared with a Schottky contact based NG. The experimental study is carried out using the tip excitation method...
August 14, 2018: Nanoscale
Sake Wang, Hongyu Tian, Chongdan Ren, Jin Yu, Minglei Sun
The structural, electronic, and optical properties of heterostructures formed by transition metal dichalcogenides MX2 (M = Mo, W; X = S, Se) and graphene-like zinc oxide (ZnO) were investigated using first-principles calculations. The interlayer interaction in all heterostructures was characterized by van der Waals forces. Type-II band alignment occurs at the MoS2 /ZnO and WS2 /ZnO interfaces, together with the large built-in electric field across the interface, suggesting effective photogenerated-charge separation...
August 13, 2018: Scientific Reports
Mona Shaaban, Areej M El-Mahdy
Nanoparticles (NPs) are gaining special interest due to their recent applications as antimicrobial agents to defeat the massive threat of resistant pathogens. This study focused on the utilisation of Streptomyces isolate S12 purified from waste discharge soil in the biological synthesis of silver (Ag), selenium (Se), and zinc oxide (ZnO) NPs. The isolate S12 was related to Streptomyces enissocaesilis according to 16S rRNA sequence analysis, morphological characteristics, and biochemical reactions. The cell-free supernatant has been used for the synthesis of Ag, Se, and ZnO NPs...
September 2018: IET Nanobiotechnology
Tejaswi Thunugunta, Aswath Channa Reddy, Shivashankara Kodthalu Seetharamaiah, Laxman Ramanna Hunashikatti, Satisha Gowdra Chandrappa, Narayana Cherukatu Kalathil, Lakshmana Reddy Dhoranapalli Chinnappa Reddy
The increasing use of nanoparticles and their occurrence in the environment has made it imperative to elucidate their impact on the environment. Although several studies have advanced the authors' understanding of nanoparticle-plant interactions, their knowledge of the exposure of plants to nanoparticles and their effects on edible crop plants remain meager and is often paradoxical. The aim of this study was to increase their knowledge on the effect of zinc oxide (ZnO) nanoparticles on eggplant seed germination and seedling growth...
September 2018: IET Nanobiotechnology
Vimala Devi Subramaniam, Suhanya Veronica Prasad, Antara Banerjee, Madhumala Gopinath, Ramachandran Murugesan, Francesco Marotta, Xiao-Feng Sun, Surajit Pathak
In recent years, nanoparticles are being used extensively in personal healthcare products such as cosmetics, sunscreens, soaps, and shampoos. Particularly, metal oxide nanoparticles are gaining competence as key industrial constituents, progressing toward a remarkable rise in their applications. Zinc oxide and titanium oxide nanoparticles are the most commonly employed metal oxide nanoparticles in sunscreens, ointments, foot care, and over the counter topical products. Dermal exposure to these metal oxides predominantly occurs through explicit use of cosmetic products and airway exposure to nanoparticle dusts is primarily mediated via occupational exposure...
August 13, 2018: Drug and Chemical Toxicology
Partha Kumbhakar, Ashim Pramanik, Subrata Biswas, Arup Kanti Kole, Rajat Sarkar, Pathik Kumbhakar
Recently, research activities are focused on development of 2D reduced graphene oxide (rGO) based semiconductor nanocomposite materials for boosting up its catalytic applications. In this work, a rarely reported green synthesis approach has been envisioned to synthesize in-situ 2D rGO-ZnO (rGZn) nanocomposites from Apple juice and zinc acetate. Also the composition of the samples has been optimized to achieve high photocatalytic and self-cleaning properties by the formation of reactive oxidation species. The samples are characterized for their microstructural, optical absorption and photoluminescence properties...
July 29, 2018: Journal of Hazardous Materials
Karuppasamy Prem Ananth, Jinxing Sun, Jiaming Bai
In this paper, the synthesis of porous manganese substituted hydroxyapatite (Mn-HAp) coating on zinc oxide (ZnO) coated stainless steel (316L SS) using the electrodeposition technique is reported. The structural, functional, morphological, and elemental analyses are characterized by various analytical techniques including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS)...
August 9, 2018: International Journal of Molecular Sciences
Ajay Jose, K R Sunaja Devi, Dephan Pinheiro, S Lakshmi Narayana
The effect of surfactant and dopant on the properties of zinc oxide nanoparticles were studied by preparing polyethylene glycol (PEG) capped ZnO and tungsten doped PEG capped ZnO nanoparticles via the electrochemical method. These nanoparticles were characterized using X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Ultraviolet Diffuse Reflection Spectroscopy (UV-DRS), Scanning Electron Microscopy (SEM) and Electron Dispersive Analysis of X Rays (EDAX). The photocatalytic degradation of malachite green dye using these nanoparticles was studied under visible light...
August 2, 2018: Journal of Photochemistry and Photobiology. B, Biology
Aydan Caglayan, Doruk Cevdi Katlan, Zafer Selcuk Tuncer, Kunter Yuce, Hasan Berkan Sayal, Belma Kocer-Gumusel
OBJECTIVES: Uterine myomas (UM) are responsible for significant morbidity and have adverse effects on quality of life in women. Reactive oxygen species (ROS) and antioxidant enzymes (AOE), as well as sex steroids play important roles in the reproductive physiology processes. Thus, we aimed to investigate the role of oxidant-antioxidant status in UM by measuring the AOE activities and lipid peroxidation (LPO) levels. This is the first study assessing these parameters together in UM based on also menopausal status and evaluating possible correlations between AOE activities, LPO markers, tumor biomarkers, female reproductive system hormone levels, comprehensively...
August 1, 2018: European Journal of Obstetrics, Gynecology, and Reproductive Biology
Jalil Javedani Bafekr, Razieh Jalal
The development of antibiotic resistance among hospital pathogens has provided a great need for new antimicrobial agents. Zinc oxide nanoparticles (ZnO NPs) in combination with various antibiotics can act as a reducing agent for antibiotic resistance. The aim of this study was to investigate the influence and the mechanism of ZnO NPs on the antimicrobial activity of ciprofloxacin (CP) and ceftazidime (CAZ) against Enterococcus faecalis ( E. faecalis ) and Acinetobacter baumannii ( A. baumannii ) bacteria in acidic conditions (pH 5...
August 2018: IET Nanobiotechnology
Saher Nazir, Mehreen Zaka, Muhammad Adil, Bilal Haider Abbasi, Christophe Hano
Currently, the evolution of green chemistry in the synthesis of nanoparticles (NPs) with the usage of plants has captivated a great response. In this study, in vitro plantlets and callus of Silybum marianum were exploited as a stabilising agent for the synthesis of zinc oxide (ZnO) NPs using zinc acetate and sodium hydroxide as a substitute for chemical method. The contemporary investigation defines the synthesis of ZnO NPs prepared by chemical and bio-extract-assisted methods. Characterisation techniques such as X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy and energy dispersive X-ray were used to confirm the synthesis...
August 2018: IET Nanobiotechnology
Sacha Juillard, Emilie Planes, Muriel Matheron, Lara Perrin, Solenn Berson, Lionel Flandin
The encapsulation of Organic Photovoltaic (OPV) devices can help mitigate the degradation induced by environmental factors like water and oxygen, and thus potential to increase OPV lifetime. Because flexibility is an important parameter for targeted OPV applications, this paper proposes a fundamental study on the impact of the roll-to-roll (R2R) flexible encapsulation process. Both performance and mechanical reliability of encapsulated devices have been scouted. Furthermore, it has been demonstrated that a relatively simple peeling technique allows understanding the role of the interfaces inside a multilayered OPV device supported by a flexible polyethylene terephthalate substrate...
August 10, 2018: ACS Applied Materials & Interfaces
Xun Pei, Zhiping Xiao, Lujie Liu, Geng Wang, Wenjing Tao, Minqi Wang, Junbiao Zou, Dongbi Leng
BACKGROUND: This study evaluated the effects of dietary zinc oxide nanoparticles (nano-ZnOs) on growth performance, zinc status, intestinal morphology, microflora population, and immune response in weaned piglets. A total of 150 weaned piglets (9.37 ± 0.48 kg) were randomly allotted to five dietary treatments and fed with basal diet (control), basal diet supplemented with nano-ZnOs at 150, 300, or 450 mg kg-1 , and 3,000 mg kg-1 ZnO for 21 days. After feeding trial, six pigs from the control, 450 mg kg-1 nano-ZnOs and 3,000 mg kg-1 ZnO were slaughtered...
August 9, 2018: Journal of the Science of Food and Agriculture
Fusheng Zhao, Fang Lei, Xiang Yan, Senfeng Zhang, Wen Wang, Yu Zheng
BACKGROUND/AIMS: Cigarette smoke exposure (CSE) during pregnancy is a well-recognized health hazard that causes placental damage. Hydrogen sulfide (H2S) has been reported to protect multiple organs from injury. However, the protective effects of H2S have not been tested in the placenta. This study aimed to explore the potential of H2S in protecting placenta against oxidative injury induced by CSE during pregnancy and the possible underlying mechanisms. METHODS: Pregnant SD rats were randomly divided into 4 groups: NaCl, NaHS (a donor of H2S), CSE and CSE+NaHS...
August 9, 2018: Cellular Physiology and Biochemistry
Belma Turan
Zinc (mostly as free/labile Zn2+ ) is an essential structural constituent of many proteins, including enzymes in cellular signaling pathways via functioning as an important signaling molecule in mammalian cells. In cardiomyocytes at resting condition, intracellular labile Zn2+ concentration ([Zn2+ ]i ) is in the nanomolar range, whereas it can increase dramatically under pathological conditions, including hyperglycemia, but the mechanisms that affect its subcellular redistribution is not clear. Therefore, overall, very little is known about the precise mechanisms controlling the intracellular distribution of labile Zn2+ , particularly via Zn2+ transporters during cardiac function under both physiological and pathophysiological conditions...
August 8, 2018: Biological Trace Element Research
Jay Leipheimer, Amanda L M Bloom, Tilman Baumstark, John C Panepinto
In Cryptococcus neoformans , mRNAs encoding ribosomal proteins (RP) are rapidly and specifically repressed during cellular stress, and the bulk of this repression is mediated by deadenylation-dependent mRNA decay. A motif-finding approach was applied to the 3' untranslated regions (UTRs) of RP transcripts regulated by mRNA decay, and a single, significant motif, GGAUG, was identified. Znf9, a small zinc knuckle RNA binding protein identified by mass spectrometry, was found to interact specifically with the RPL2 3'-UTR probe...
August 8, 2018: MSphere
Jun Peng, Lihong Miao, Xi Chen, Pulin Liu
The whole-genome transcriptional response of Pseudomonas putida KT2440 to stress-inducing concentrations of zinc was analyzed in this study by RNA sequencing to thoroughly investigate the bacterial cell response to zinc toxicity. The data revealed that different levels of zinc stress strongly affected the transcription of genes from the following categories: metal transport genes, genes involved in membrane homeostasis, oxidative-stress-responding genes, and genes associated with basic cellular metabolism. At the lowest zinc dose, only several genes associated with metal transport and membrane homeostasis were strongly influenced...
2018: Frontiers in Microbiology
Zhenzhen Fan, Lifang Fan, Shaomin Shuang, Chuan Dong
A facile and sensitive photoelectrochemical (PEC) sensing platform based on zinc phthalocyanine (ZnPc) sensitized TiO2 nanorodarrays (NRAs) was successfully fabricated for detection of bisphenol A (BPA). The vertically aligned TiO2 NRAs with one-dimensional (1D) nanostructure was synthesized in-situ on fluorine-doped tin oxide-coated glass (FTO) substrate by simple one-step hydrothermal method, and then the TiO2 NRAs/FTO surface was covered with ZnPc. 1D nanostructure of TiO2 NRAs could provide not only more spaces for the load of ZnPc, but direct pathways to reduce the recombination of electron-hole pairs, improving the photocatalytic efficiency...
November 1, 2018: Talanta
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