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( Dohyeon Lee ),( Sunho Park ),( Daun Kim ),( Hyeun Nam ),( Jangho Kim ) 한국농업기계학회 2017 한국농업기계학회 학술발표논문집 Vol.22 No.1
Biocompatible capsules have recently been highlighted as novel delivery platforms of any “materials” (e.g., drug, food, agriculture pesticide) to address current problems of living systems such as humans, animals, and plats in academia and industry for agriculture, biological, biomedical, environmental, food applications. For example, biocompatible alginate capsules were proposed as a delivery platform of biocontrol agents (e.g., bacterial antagonists) for an alternative to antibiotics, which will be a potential strategy in future agriculture. Here, we proposed a new platform based on biocompatible alginate capsules that can control the movements as an active target delivery strategy for various applications including agriculture and biological engineering. We designed and fabricated large scale biocompatible capsules using alginates and custom-made nozzles as well as gelling solutions. To develop the active target delivery platforms, we incorporated the iron oxide nanoparticles in the large scale alginate capsules. It was found that the sizes of large scale alginate capsules could be controlled via various working conditions such as concentrations of alginate solutions and iron oxide nanoparticles. As a proof of concept work, we showed that the iron oxide particles-incorporated large scale alginate capsules could be moved actively by the magnetic fields, which would be a strategy as active target delivery platforms for agriculture and biological engineering (e.g., controlled delivery of agriculture pesticides and biocontrol agents).
( Daun Kim ),( Sunho Park ),( Dohyeon Lee ),( Hyeun Nam ),( Jangho Kim ) 한국농업기계학회 2017 한국농업기계학회 학술발표논문집 Vol.22 No.1
Biological systems offer unique principles for the design and fabrication of engineering platforms (i.e., popularly known as “Biomimetics”) for various applications in many fields. For example, the lotus leaves exhibit unique surfaces consisting of evenly distributed micro and nanostructures. These unique surfaces of lotus leaves have the ability of superhydrophobic property to avoid getting wet by the surrounding water (i.e., Lotus effect). Inspired by the surface topographies of lotus leaves, the artificial superhydrophobic surfaces were developed using various micro- and nanoengineering. Here, we propose new platforms that can control hydrophilic and hydrophobic property of surfaces by mimicking micro- and nanosurfaces of various natural leaves such as common camellia, hosta plantaginea, and lotus. Using capillary force lithography technology and polymers in combination with biomimetic design principle, the unique micro- and nanostructures mimicking natural surfaces of common camellia, hosta plantaginea, and lotus were designed and fabricated. We also demonstrated that the replicated polymeric surfaces had different hydrophilic and hydrophobic properties according to the mimicking the natural leaf surfaces, which could be used as a simple, but powerful methodology for design and fabrication of controlled hydrophilic and hydrophobic platforms for various applications in the field of agriculture and biological engineering.
Controlled extracellular topographical and chemical cues for acceleration of neuronal development
Park, Sunho,Choi, Kyoung Soon,Kim, Daun,Kim, Woochan,Lee, Dohyeon,Kim, Hong-Nam,Hyun, Hoon,Lim, Ki-Taek,Kim, Jin-Woo,Kim, Yang-Rae,Kim, Jangho Elsevier 2018 Journal of industrial and engineering chemistry Vol.61 No.-
<P><B>Abstract</B></P> <P>Physical and chemical cues, which have emerged as a promising strategy for regulating cellular behaviors, provide important signaling cues to living cells. Neurons are also exposed to distinguishing physical and chemical environments that can greatly influence their behaviors and functions. In this study, we proposed the laminin-coated matrix nanotopography platforms (LMNPs) that generate extracellular physical and chemical cues for neuronal development. Using our platforms, we showed that nanotopographical and biochemical cues could provide suitable environments for neuronal cultures. More importantly, we showed that a LMNPs could control the orientation of neuronal structures as well as accelerate neuronal development through synergistic effects of extracellular nanotopographical and chemical cues. Our study imparts new design principles on the role of nanotopographical and chemical cues in neuronal development for the fabrication of neuroprosthetic scaffolds.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>