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Feeding‐Gas Effects of Plasma Jets on <i>Escherichia coli</i> in Physiological Solutions
Baik, Ku Youn,Kim, Yong Hee,Ryu, Young Hyo,Kwon, Hye Seon,Park, Gyungsoon,Uhm, Han S.,Choi, Eun H. WILEY‐VCH Verlag 2013 Plasma Processes and Polymers Vol.10 No.3
<P><B>Abstract</B></P><P>The effects of air and N<SUB>2</SUB> plasma jets on <I>Escherichia coli</I> inside four different physiological solutions and deionized water are reported here. The feeding gases are found to influence the plasma compositions, the interactions with the liquids, and the subsequent bactericidal effects depending on the aqueous solutions to which they are exposed. Air plasma enhances the bactericidal effects of deionized water and saline by acidification. On the other hand, N<SUB>2</SUB> plasma induces higher toxicity in phosphate buffered saline by generating more electrons. Little bactericidal effects of cell culture media and blood plasma may be due to the slight change in the pH and due to electron scavenging by organic components. Taken together, our study provides additional insight into the basic interactions between plasma and cells in physiological solutions. </P>
Synthetic nanowire/nanotube-based solid substrates for controlled cell growth
Baik, Ku-Youn,Park Sung Young,Namgung Seon,Kim Daesan,Cho Dong-guk,Lee Minju,홍승훈 나노기술연구협의회 2014 Nano Convergence Vol.1 No.28
The behaviour of cells can be controlled by various microenvironments such as nanostructured cell-culture substrates with controlled nanotopography and chemical properties. One of promising substrates for controlled cell growth is a solid substrate comprised of synthetic one-dimensional nanostructures such as polymer nanofibers, carbon-based nanotubes/nanofibers, and inorganic nanowires. Such nanotube/nanowire structures have a similar dimension as extracellular matrix fibers, and their nanotopography and chemical properties can be easily controlled, which expands their possible applications in controlling the growth and differentiation of cells. This paper provides a concise review on the recent applications of solid substrates based on synthetic nanowires/nanotubes for controlled cell growth and differentiation.
The Role of Free Radicals in Hemolytic Toxicity Induced by Atmospheric-Pressure Plasma Jet
Baik, Ku Youn,Huh, Yoon Ho,Kim, Yong Hee,Kim, Jeongho,Kim, Min Su,Park, Hun-Kuk,Choi, Eun Ha,Park, Byoungchoo Hindawi 2017 Oxidative medicine and cellular longevity Vol.2017 No.-
<P>Atmospheric-pressure plasma (APP) has received attention due to its generation of various kinds of reactive oxygen/nitrogen species (ROS/RNS). The controllability, as well as the complexity, is one of the strong points of APP in various applications. For biological applications of this novel method, the cytotoxicity should be estimated at various levels. Herein, we suggest red blood cell (RBC) as a good cell model that is simpler than nucleated cells but much more complex than other lipid model systems. Air and N<SUB>2</SUB> gases were compared to verify the main ROS/RNS in cytotoxicity, and microscopic and spectroscopic analyses were performed to estimate the damages induced on RBCs. The results shown here will provide basic information on APP-induced cytotoxicity at cellular and molecular levels.</P>
Acupuncture Meridian and Intravascular Bonghan Duct
Baik, Ku Youn,Lee, Ja Woong,Lee, Byung Cheon,Johng, Hyeon Min,Nam, Tae Jeong,Sung, Baeckkyoung,Cho, Sung Il,Soh, Kwang Sup Trans Tech Publications, Ltd. 2005 Key Engineering Materials Vol.277 No.-
<P>Current anatomical theory does not recognize the existence of an extended floating threadlike structure inside the blood vessels. Nonetheless, this study developed a new method for observing such an intravascular threadlike structure. The key technique involves injecting acridineorange into the femoral vein to circulate along the blood vessels and stain the nuclei of the intravascular threads inside the blood vessels. In-situ observations were then made under a fluorescence stereomicroscope after saline-perfusion. Confocal microscope images revealed a distinctive characteristic pattern of nucleus distribution that was clearly distinguishable from fibrin, capillaries, small venules, arterioles, or lymph vessels. Accordingly, it is suggested that the identified intravascular threads are part of the Bonghan's circulatory network that is distributed throughout the body, including inside the blood vessels.</P>
Nanowire and nanotube transistors for lab-on-a-chip applications
Lee, Minbaek,Baik, Ku Youn,Noah, Meg,Kwon, Young-Kyun,Lee, Jeong-O,Hong, Seunghun Royal Society of Chemistry 2009 Lab on a chip Vol.9 No.16
<P>Implementation of one-dimensional nanostructure-based devices in the lab-on-a-chip framework can allow us to impart various functionalities such as highly-sensitive sensors to a single chip. However, it is still extremely difficult to position nanowires or nanotubes on a defined area of solid substrates to build integrated functional devices. Herein, we review promising strategies for the massive integration of nanowires/nanotubes on lab-on-a-chip and their practical applications to sensors. The theoretical understanding and sensor characteristics of nanowire/nanotube-based devices are also discussed.</P> <P>Graphic Abstract</P><P>Nanowire/nanotube-based transistors can be a new versatile component for Lab-on-a-Chip applications because they can add various new capabilities such as ultra-sensitive and miniaturized sensors. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b905185f'> </P>