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Yinhua Cui,최은미,Areum Kim,Leeseul Oh,Seon Jea Lee,Ayeon Ryang,박한수,임경희,표성규 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.4
Prior to electroless plating of the solar cell electrode, the sample was cleaned with a mixture of a sulfuric acid and peroxide solution and a H2NCH2CH2CH2Si(OC2H5) solution. We measured the de-wetting and contact angles of the solar cell thin film electrode. After SPM and APTES treatments, an excellent hydrophilic contact angle was observed. Our results show that it is more effective to remove oxidizer with SiO2 than HF mixed solutions. When comparing the efficiency, pre-treatment with a NH4F:HF mixed solution was more efficient than pre-treatment with a diluted HF solution. After NH4F:HF mixed solution cleaning, when the electrode was formed, the contact resistance that most directly affected the cleaning effect was 0.8194 ohm/sq, which had three times more improvement effect. It is expected that if an optimum cleaning time and process conditions for each cleaning chemical is developed, more improved contact resistance will be secured when each cleaning chemical is applied.
Carbon-based drug delivery carriers for cancer therapy
Lim, Dong-Jin,Sim, Myeongbu,Oh, Leeseul,Lim, Kyunghee,Park, Hansoo 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.1
In the search to improve anticancer therapies, several drug carriers, including carbon-based nanomaterials have been studied. Both liposomes and polymeric microspheres have been used in anticancer drugs. However, there remains an on-going need for better therapeutic materials that have good drug solubility, an ability to reduce systemic toxicity through specific-tumor targeting, and rapid clearance. In this regard, carbon allotropes such as graphene oxide (GOs), carbon nanotubes (CNTs), and nanodiamonds (NDs), have been investigated, as they possess sufficient surface-to-volume ratio, thermal conductivity, rigid structural properties capable of post-chemical modification, and excellent biocompatibility. This review is aimed at exploring these carbon-based nanomaterials for use as multifaceted cancer drug carriers and is intended to demonstrate that GOs, CNTs, and NDs are likely to improve chemotherapeutical strategy for cancers in either a sole or combinational manner.
Lee, Seul,Kang, Dae-Won,Yoo, Ji-Hyock,Park, Sang-Won,Oh, Kyeong-Seok,Lee, Jin-Ho,Cho, Il Kyu,Moon, Byeong-Churl,Kim, Won-Il 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.2
There is an increasing concern over heavy metal(loid) contamination of soil in agricultural areas including paddy soils. This study was conducted to determine the bioconcentration factor (BCF) for heavy metal(loid)s to brown rice grown in paddy soils vulnerable to heavy metal(loid)s contamination, for the quantitative health risk assessment to the residents living nearby the metal contaminated regions. The samples were collected from 98 sites nationwide in the year 2015. The mean and range BCF values of As, Cd, Cu, Ni, Pb, and Zn in brown rice were 0.027 (0.001 ~ 0.224), 0.143 (0.001 ~ 2.434), 0.165 (0.039 ~ 0.819), 0.028 (0.005 ~ 0.187), 0.006 (0.001 ~ 0.048), and 0.355 (0.113 ~ 1.263), respectively, with Zn showing the highest. Even though the relationship between heavy metal(loid) contents in the vulnerable soils and metal contents in brown rice collected at the same fields was not significantly correlated, the relationship between log contents of heavy metal(loid)s in the vulnerable soils and BCF of brown rice wes significantly correlated with As, Cd, Cu, and Zn in rice. In conclusion, soil environmental risk assessment for crop uptake should consider the bioconcentration factor calculated using both the initial and vulnerable heavy metal(loid) contents in the required soil and the crop cultivated in the same fields.
Prediction of Arsenic Uptake by Rice in the Paddy Fields Vulnerable to Arsenic Contamination
Lee, Seul,Kang, Dae-Won,Kim, Hyuck-Soo,Yoo, Ji-Hyock,Park, Sang-Won,Oh, Kyeong-Seok,Cho, Il Kyu,Moon, Byeong-Churl,Kim, Won-Il 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.2
There is an increasing concern over arsenic (As) contamination in rice. This study was conducted to develope a prediction model for As uptake by rice based on the physico-chemical properties of soil. Soil and brown rice samples were collected from 46 sites in paddy fields near three different areas of closed mines and industrial complexes. Total As concentration, soil pH, Al oxide, available phosphorus (avail-P), organic matter (OM) content, and clay content in the soil samples were determined. Also, 1.0 N HCl, 1.0 M $NH_4NO_3$, 0.01 M $Ca(NO_3)_2$, and Mehlich 3 extractable-As in the soils were measured as phytoavailable As concentration in soil. Total As concentration in brown rice samples was also determined. Relationships among As concentrations in brown rice, total As concentrations in soils, and selected soil properties were as follows: As concentration in brown rice was negatively correlated with soil pH value, where as it was positively correlated with Al oxide concentration, avail-P concentration, and OM content in soil. In addition, the concentration of As in brown rice was statistically correlated only with 1.0 N HCl-extractable As in soil. Also, using multiple stepwise regression analysis, a modelling equation was created to predict As concentration in brown rice as affected by selected soil properties including soil As concentration. Prediction of As uptake by rice was delineated by the model [As in brown rice = 0.352 + $0.00109^*$ HCl extractable As in soil + $0.00002^*$ Al oxide + $0.0097^*$ OM + $0.00061^*$ avail-P - $0.0332^*$ soil pH] ($R=0.714^{***}$). The concentrations of As in brown rice estimated by the modelling equation were statistically acceptable because normalized mean error (NME) and normalized root mean square error (NRMSE) values were -0.055 and 0.2229, respectively, when compared with measured As concentration in the plant.