scholarly journals Effect on Growth, Photosynthesis, and Oxidative Stress of Single Walled Carbon Nanotubes Exposure to Marine AlgaDunaliella tertiolecta

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Megha Thakkar ◽  
Somenath Mitra ◽  
Liping Wei
Keyword(s):  
Oxidative Stress ◽  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Lag Phase ◽  
Acid Oxidation ◽  
Multiwalled Carbon ◽  
Single Walled Carbon ◽  
Intracellular Glutathione ◽  
Functionalized Multiwalled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Single walled carbon nanotubes were carboxylated by microwave assisted acid oxidation (f-SWCNTs) and examined for their ecotoxicity on marine alga chlorophyteDunaliella tertiolecta.Toxicity was evaluated based on growth, photosynthetic activities, oxidative stress, and intracellular glutathione in the concentration range of 0.1–20 mg/L f-SWCNT. Physical interactions between the f-SWCNT and alga were examined using light microscopy and scanning electron microscope. Increasing the nanotube concentration increased the toxic effects where growth inhibition was as high as 30%, photosynthetic yield decreased by as much as 18%, and intracellular glutathione reduction reached 95%. The results from f-SWCNTs were somewhat different when compared to our previous study using the same algae and functionalized multiwalled carbon nanotubes, where exposure led to longer lag phase and higher growth rate inhibition.

scholarly journals Removal and Adsorption ofp-Nitrophenol from Aqueous Solutions Using Carbon Nanotubes and Their Composites

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Yuan-Xiang Yao ◽  
He-Bing Li ◽  
Jin-Yun Liu ◽  
Xin-Liang Tan ◽  
Jin-Gang Yu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solutions ◽  
Multiwalled Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Contaminated Water ◽  
Adsorption Ability ◽  
Multiwalled Carbon ◽  
Single Walled Carbon ◽  
Functionalized Multiwalled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In an attempt to explore the possibility of using carbon nanotubes (CNTs) as efficient adsorbents for removal of pollutants from the contaminated water, the adsorption ofp-nitrophenol (PNP) on raw multiwalled carbon nanotubes (r.MWNTs) with different outer diameters, various functionalized multiwalled carbon nanotubes (f-MWNTs), raw single-walled carbon nanotubes (r.SWNTs) and oxidized single-walled carbon nanotubes (ox-SWNTs) has been investigated. The ox-SWNTs showed better adsorption ability for PNP with different concentrations, while lower uptake capacity was found for all of the r.MWNTs andf-MWNTs. The removal efficiency of PNP by ox-SWNTs was around 98%, indicating that ox-SWNTs possess a great potential application prospect for removing PNP from aqueous solutions.

scholarly journals Dragging Human Mesenchymal Stem Cells with the Aid of Supramolecular Assemblies of Single-Walled Carbon Nanotubes, Molecular Magnets, and Peptides in a Magnetic Field

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Ana Cláudia C. de Paula ◽  
Gustavo A. M. Sáfar ◽  
Alfredo M. Góes ◽  
Marcelo P. Bemquerer ◽  
Marcos A. Ribeiro ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Carbon Nanotubes ◽  
Stem Cells ◽  
Supramolecular Assembly ◽  
Single Walled Carbon Nanotubes ◽  
Molecular Magnets ◽  
Multiwalled Carbon ◽  
Blood Capillaries ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Human adipose-derived stem cells (hASCs) are an attractive cell source for therapeutic applicability in diverse fields for the repair and regeneration of damaged or malfunctioning tissues and organs. There is a growing number of cell therapies using stem cells due to their characteristics of modulation of immune system and reduction of acute rejection. So a challenge in stem cells therapy is the delivery of cells to the organ of interest, a specific site. The aim of this paper was to investigate the effects of a supramolecular assembly composed of single-walled carbon nanotubes (SWCNT), molecular magnets (lawsone-Co-phenanthroline), and a synthetic peptide (FWYANHYWFHNAFWYANHYWFHNA) in the hASCs cultures. The hASCs were isolated, characterized, expanded, and cultured with the SWCNT supramolecular assembly (SWCNT-MA). The assembly developed did not impair the cell characteristics, viability, or proliferation. During growth, the cells were strongly attached to the assembly and they could be dragged by an applied magnetic field of less than 0.3 T. These assemblies were narrower than their related allotropic forms, that is, multiwalled carbon nanotubes, and they could therefore be used to guide cells through thin blood capillaries within the human body. This strategy seems to be useful as noninvasive and nontoxic stem cells delivery/guidance and tracking during cell therapy.

scholarly journals Inhalation vs. aspiration of single-walled carbon nanotubes in C57BL/6 mice: inflammation, fibrosis, oxidative stress, and mutagenesis

2008 ◽  
Vol 295 (4) ◽  
pp. L552-L565 ◽  
Author(s):  
A. A. Shvedova ◽  
E. Kisin ◽  
A. R. Murray ◽  
V. J. Johnson ◽  
O. Gorelik ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Carbon Nanotubes ◽  
Inflammatory Response ◽  
Single Walled Carbon Nanotubes ◽  
Mechanical And Thermal Properties ◽  
Single Walled Carbon ◽  
Pharmaceutical Industries ◽  
Walled Carbon Nanotubes ◽  
Pharyngeal Aspiration ◽  
Granulomatous Pneumonia

Nanomaterials are frontier technological products used in different manufactured goods. Because of their unique physicochemical, electrical, mechanical, and thermal properties, single-walled carbon nanotubes (SWCNT) are finding numerous applications in electronics, aerospace devices, computers, and chemical, polymer, and pharmaceutical industries. SWCNT are relatively recently discovered members of the carbon allotropes that are similar in structure to fullerenes and graphite. Previously, we ( 47 ) have reported that pharyngeal aspiration of purified SWCNT by C57BL/6 mice caused dose-dependent granulomatous pneumonia, oxidative stress, acute inflammatory/cytokine responses, fibrosis, and decrease in pulmonary function. To avoid potential artifactual effects due to instillation/agglomeration associated with SWCNT, we conducted inhalation exposures using stable and uniform SWCNT dispersions obtained by a newly developed aerosolization technique ( 2 ). The inhalation of nonpurified SWCNT (iron content of 17.7% by weight) at 5 mg/m3, 5 h/day for 4 days was compared with pharyngeal aspiration of varying doses (5–20 μg per mouse) of the same SWCNT. The chain of pathological events in both exposure routes was realized through synergized interactions of early inflammatory response and oxidative stress culminating in the development of multifocal granulomatous pneumonia and interstitial fibrosis. SWCNT inhalation was more effective than aspiration in causing inflammatory response, oxidative stress, collagen deposition, and fibrosis as well as mutations of K- ras gene locus in the lung of C57BL/6 mice.

scholarly journals Single-walled carbon nanotubes repress viral-induced defense pathways through oxidative stress

2019 ◽  
Vol 13 (9) ◽  
pp. 1176-1196 ◽  
Author(s):  
Hao Chen ◽  
Sara T. Humes ◽  
Sarah E. Robinson ◽  
Julia C. Loeb ◽  
Indu V. Sabaraya ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Carbon Nanotubes ◽  
Induced Defense ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Analysis of Stress Responsive Genes Induced by Single-Walled Carbon Nanotubes in BJ Foreskin Cells

2007 ◽  
Vol 7 (2) ◽  
pp. 584-592 ◽  
Author(s):  
Shubhashish Sarkar ◽  
Chidananda Sharma ◽  
Rajeshwari Yog ◽  
Adaikkappan Periakaruppan ◽  
Olufisayo Jejelowo ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Consumer Products ◽  
Single Walled Carbon ◽  
Stress Genes ◽  
Stress Responsive Genes ◽  
Stress Related Genes ◽  
Inducible Genes ◽  
Walled Carbon Nanotubes

Nanotechnology is finding its use as a potential technology in consumer products, defense, electronics, and medical applications by exploiting the properties of nanomaterials. Single-walled carbon nanotubes are novel forms of these nanomaterials with potential for large applications. However, the toxicity studies on this material are not explored in detail and therefore limiting its use. It has been earlier reported that single-walled carbon nanotubes induces oxidative stress and also dictates activation of specific signaling pathway in keratinocytes. The present study explores the effect of single-walled carbon nanotubes on stress genes in human BJ Foreskin cells. The results show induction of oxidative stress in BJ Foreskin cells by single-walled carbon nanotubes and increase in stress responsive genes. The genes included inducible genes like HMOX1, HMOX2, and Cyp1B1. In addition we validated increase for four genes by SWCNT, namely ATM, CCNC, DNAJB4, and GADD45A by RT-PCR. Moreover results of the altered stress related genes have been discussed and that partially explains some of the toxic responses induced by single-walled carbon nanotubes.

Single-Walled Carbon Nanotubes (SWCNTs) Enhance KCl-, Acetylcholine-, and Serotonin-Induced Contractions and Evoke Oxidative Stress on Rabbit Ileum

2014 ◽  
Vol 10 (3) ◽  
pp. 529-542 ◽  
Author(s):  
Laura Grasa ◽  
Alejandro Ansón-Casaos ◽  
María Teresa Martínez ◽  
Raquel Albendea ◽  
Alba De Martino ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Rabbit Ileum ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Oxidative stress and inflammatory response in dermal toxicity of single-walled carbon nanotubes

Toxicology ◽  
2009 ◽  
Vol 257 (3) ◽  
pp. 161-171 ◽  
Author(s):  
A.R. Murray ◽  
E. Kisin ◽  
S.S. Leonard ◽  
S.H. Young ◽  
C. Kommineni ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Carbon Nanotubes ◽  
Inflammatory Response ◽  
Single Walled Carbon Nanotubes ◽  
Dermal Toxicity ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes
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