Study of the Photodynamic Effect on the A549 Cell Line by Atomic Force Microscopy and the Influence of Green Tea Extract on the Production of Reactive Oxygen Species

2009 ◽  
Vol 1171 (1) ◽  
pp. 549-558 ◽  
Author(s):  
Katerina Tomankova ◽  
Hana Kolarova ◽  
Robert Bajgar ◽  
Dagmar Jirova ◽  
Kristina Kejlova ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Atomic Force Microscopy ◽  
Green Tea ◽  
A549 Cell ◽  
Oxygen Species ◽  
Photodynamic Effect ◽  
A549 Cell Line ◽  
Force Microscopy ◽  
Atomic Force ◽  
Tea Extract

scholarly journals Advanced microscopy applied to the study of photodynamic mechanism in bacteria

2019 ◽  
Author(s):  
Júlia Bertagna ◽  
Monica Alonso Co ◽  
Duber M. M. Munar ◽  
Edmyr R. Reis ◽  
Rickson C. Mesquita
Keyword(s):  
Atomic Force Microscopy ◽  
Cell Death ◽  
Photodynamic Therapy ◽  
Protoporphyrin Ix ◽  
Wide Field ◽  
Photodynamic Effect ◽  
Force Microscopy ◽  
Atomic Force

Photodynamic therapy (PDT) is an emergent technique used in clinical treatments for several pathologies, in which the photoactivation of photosensitizer molecule leads to cell death. Our project investigates the photodynamic effect of Protoporphyrin IX (PpIX), one of the currently most used photosensitizers, in prokaryotic cells, in order to explore its use in sterilization. Atomic Force Microscopy (AFM) and Wide Field Microscopy (WFM) were used to evaluate PDT effects on X.fastidiosa cells.

scholarly journals Green tea extract decreases muscle necrosis in mdx mice and protects against reactive oxygen species

2002 ◽  
Vol 75 (4) ◽  
pp. 749-753 ◽  
Author(s):  
Timo M Buetler ◽  
Mathilde Renard ◽  
Elizabeth A Offord ◽  
Heinz Schneider ◽  
Urs T Ruegg
Keyword(s):  
Reactive Oxygen Species ◽  
Green Tea ◽  
Reactive Oxygen ◽  
Green Tea Extract ◽  
Mdx Mice ◽  
Oxygen Species ◽  
Muscle Necrosis ◽  
Tea Extract

scholarly journals Electron dynamics of tip-tunable oxygen species on TiO2 surface

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Yuuki Adachi ◽  
Ján Brndiar ◽  
Huan Fei Wen ◽  
Quanzhen Zhang ◽  
Masato Miyazaki ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Atomic Force Microscopy ◽  
Low Temperatures ◽  
Electron Tunneling ◽  
Single Atom ◽  
Oxygen Species ◽  
Redox States ◽  
Force Microscopy ◽  
Atomic Force ◽  
Highly Sensitive

AbstractThe redox states of oxygen species on the surface of TiO2 can be altered by electron tunneling by varying the applied bias voltage of an atomic force microscope tip. However, tunneling is stochastic in nature and typically requires ultra-low temperatures to obtain statistically significant data. Here, we use a highly sensitive fast atomic force microscopy setup to study redox transitions of oxygen atoms on a TiO2 surface, in the form of reactive oxygen species and single-atom quantum dots, at 78 K. The fast and highly sensitive nature of our experimental setup enables a statistically necessary amount of data to be collected without having to resort to ultra-low temperatures. This enabled us to study multiple dots and provide insight into the electronic structure and correlation between the oxygen species, which are inaccessible by standard atomic force microscopy. We show that single-atom quantum dots exist in two charge states with drastically different conductance, with one being conducting and the other non-conducting.

scholarly journals Decrement in Cellular Iron and Reactive Oxygen Species, and Improvement of Insulin Secretion in a Pancreatic Cell Line Using Green Tea Extract

Pancreas ◽  
2019 ◽  
Vol 48 (5) ◽  
pp. 636-643 ◽  
Author(s):  
Pimpisid Koonyosying ◽  
Chairat Uthaipibull ◽  
Suthat Fucharoen ◽  
Evangelia Vlachodimitropoulou Koumoutsea ◽  
John B. Porter ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Insulin Secretion ◽  
Cell Line ◽  
Green Tea ◽  
Reactive Oxygen ◽  
Green Tea Extract ◽  
Oxygen Species ◽  
Pancreatic Cell ◽  
Cellular Iron ◽  
Tea Extract
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