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The monitoring of heavy metals(Lead and cadmium) in honeys consumed in Incheon region
( Sung Mo Lee ),( Jung Im Kim ),( Eun Jeong Park ),( Jee Young Hong ),( Jung Goo Lee ),( Hyun Soon Hwang ),( Yong Hee Kim ) 한국가축위생학회 2006 韓國家畜衛生學會誌 Vol.29 No.4
This study was conducted to investigate the contents of lead(Pb) and cadmium(Cd) in honeys(n=60) from April to May in 2004 and to provide the scientific basis for heavy metal regulations of Korea Food Code. The samples were digested with acids, then analyzed for the contents of Pb and Cd by an inductively coupled plasma spectrometer(ICP). The contents of Pb and Cd 〔minimum-maximum(mean)〕were 0.189-1.82㎎/kg(0.568) and not detected(ND)-0.016㎎/kg(0.0008) in domestic acacia honeys(n=20), ND-1.702㎎/kg(0.329) and ND-0.243㎎/kg(0.013) in domestic wild flower honeys(n=18), ND-0.322㎎/kg(0.073), ND-0.027㎎/kg(0.002) in imported honeys(n=13), ND-3.754㎎/kg(0.671) and ND-0.658㎎/kg(0.073) in foreign honeys(n=9) brought by Korean travellers, respectively. According to the results, foreign honeys brought by Korean travellers were detected with the highest level of Pb and Cd. Therefore, we recommend that heavy metals of domestic and foreign honeys should be continuously monitored. It is also thought that these results could be the important references to establish the standard of Pb and Cd in honey.
( Sang Hoon Park ),( Jeong Keun Ji ),( Won Ki Ahn ),( Jun Sig Kum ),( Ki Ho Kim ),( Won Mo Seong ) 대한금속재료학회 ( 구 대한금속학회 ) 2008 ELECTRONIC MATERIALS LETTERS Vol.4 No.4
We studied the complex permittivity and permeability properties of magnesium-copper spinel ferrite under various heat-treatment conditions. We simulated two types of materials: dielectric and magneto-dielectric. Dielectric materials show the miniaturization of the antenna; however, decreases of bandwidth and efficiency are observed. Magneto-dielectric materials show the capability of improvement of bandwidth and efficiency with a miniaturization of the antenna. The target properties were established from simulated results of permittivity and permeability <10, and permittivity/permeability □ 1. Magnesium spinel ferrite was shown to increase the permittivity (from 7 to 11.7) and the permeability (from 5.5 to 8.2) with an increase of sintering temperature (from 1,150℃ to 1,350℃). However, the high sintering temperature (1,350℃) affected the increase of permittivity more than it did the permeability, and this condition deteriorated the ratio, loss, and resonance frequency. These problems were overcome with the substitution of copper (of formula Mg0.9Cu0.1Fe2O4), the addition of a sintering agent (alginate 1 wt%), and the condition of a lower sintering temperature (1,250℃). The new conditions showed equal value (□ 9.5) of the permittivity and permeability.
Jeong, Sinyoung,Park, Ji Yong,Cha, Myeong Geun,Chang, Hyejin,Kim, Yong-il,Kim, Hyung-Mo,Jun, Bong-Hyun,Lee, Dong Soo,Lee, Yoon-Sik,Jeong, Jae Min,Lee, Yun-Sang,Jeong, Dae Hong Royal Society of Chemistry 2017 Nanoscale Vol.9 No.7
<P>Antibody-conjugated nanoparticles (NPs) have attracted great attention in diagnostic and therapeutic applications due to their high sensitivity and specificity for biotargets, as well as their wide applicability. Unfortunately, these features are significantly affected by antibody conjugation methods in terms of conjugation efficiency, orientation of the target binding site in the antibody, and denaturation during chemical conjugation reactions. Furthermore, the number of conjugated antibodies on each NP and the overall targeting efficacy are critical factors for a quantitative bioassay with antibody-conjugated NPs. Herein, we report a versatile and oriented antibody conjugation method using copper-free click chemistry. Moreover, the number of conjugated antibodies and their binding capacity were quantitatively and experimentally evaluated using fluorescently-labeled antibodies and antigens. The strong binding capability of antibody-conjugated NPs prepared using the copper-free click chemistry-based conjugation strategy was 8 times superior to the binding capability seen following the use of the EDC/NHS-coupling method. Additionally, the versatility of the developed antibody conjugation method was also demonstrated by conjugation of the antibody to three kinds of silica-encapsulated NPs.</P>
Long-Term Tropical Residency Diminishes Central Sudomotor Sensitivities in Male Subjects
Jeong-Beom Lee,Jun-Sang Bae,Young-Oh Shin,Jong-Chul Kang,Takaaki Matsumoto,Aliopva Aziza Toktasynovna,Alipov Gabit Kaimovich,Wan-Jong Kim,Young-Ki Min,Hun-Mo Yang 대한생리학회-대한약리학회 2007 The Korean Journal of Physiology & Pharmacology Vol.11 No.6
Tropical natives (TROP) are capable of tolerating tropical heat because of their long-term adaptation to tropical environments. When exposed to heat stress, these natives tend to respond with lower sweat output, which is generally thought to be the result of heat acclimatization. The main objective of this study was to clarify central mechanisms inherent to suppressed thermal sweating in tropical natives (Malaysians) by comparing their sweating responses to those of temperate native (TEMP) (Koreans). This experiment was conducted in a thermoneutral climatic chamber (24±0.5<SUP>o</SUP>C, 40±3% relative humidity). Heat loads were applied to each subject by the immersion of their lower legs in a hot water bath (43<SUP>o</SUP>C for 30 min). Sweat onset-time and sweat volume were compared between TROP and TEMP. The sweat onset-times on four selected points on the body ranged from 10.25 to 13.47 min in TEMP subjects, and from 16.24 to 17.83 min in TROP subjects (p<0.001). The local sweat volumes at the same sites ranged from 4.30 to 9.74 mg/cm<SUP>2</SUP> in TEMP subjects, and from between 1.80 to 4.40 mg/cm<SUP>2</SUP> in TROP subjects (p<0.001). These results demonstrated a significant difference between TROP and TEMP subjects with regard to the manner in which they regulate their body temperatures when exposed to heat loads, and verified that long-term thermal adaptation blunts sweating sensitivities.
Jeong-Man Kim,Jang-Young Choi,Min-Mo Koo,Hyeon-Jae Shin,Sung-Ho Lee Institute of Electrical and Electronics Engineers 2016 IEEE transactions on applied superconductivity Vol.26 No.4
<P>This paper presents a characteristic analysis of a tubular-type permanent-magnet (PM) linear magnetic coupling (TLMC) based on analytical magnetic field calculations. First, the analytical solutions for magnetic fields generated by PM are derived on the basis of a magnetic vector potential and a 2-D polar coordinate system. Next, the magnetic force is also determined on the basis of these solutions. The magnetic field and force obtained by the analytical method are compared with those obtained by the finite-element analysis and experiment, which validates the analysis methods presented in this paper.</P>