There is an ever growing interest in the development of biochar from a large variety of agrowastes. Herein, the main objective is the conversion of pomegranate peel powder biochar and its post-functionalization by phosphoric acid treatment, followed by arylation organic reaction. The latter was conducted using in situ-generated diazonium salts of 4-aminobenzoic acid ( H2N-C6H4-COOH), sulfanilic acid ( H2N-C6H4-SO3H) and Azure A dye. The effect of diazonium nature and concentration on the arylation process was monitored using thermal gravimetric analysis (TGA) and Raman spectroscopy, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). SEM pictures showed micrometer-sized biochar particles with tubular structure having about 10–20 μm-wide channels. SEM studies have shown that arylation did not affect the morphology upon arylation. The porous structure did not collapse and withstood the arylation organic reaction in acid medium did not collapse upon arylation. TGA and Raman indicated gradual changes in the arylation of biochar at initial concentrations 10– 5, 10– 4 and 10– 3 mol L− 1 of 4-aminobenzoic acid. The detailed Raman spectra peak fittings indicate that the D/G peak intensity ratio leveled off at 3.35 for 4-aminobenzoic acid initial concentration of 10– 4 mol L− 1, and no more change was observed, even at higher aryl group mass loading. This is in line with formation of oligoaryl grafts rather than the grafting of new aryl groups directly to the biochar surface. Interestingly, Azure A diazonium salt induced much lower extent of surface modification, likely due to steric hindrance. To the very best of our knowledge, this is the first report on diazonium modification of agrowaste-derived biochar and opens new avenues for arylated biochar and its applications.

Organic scintillator is easy to manufacture a large size and the fluorescence decay time is short. However, it is not suitable for gamma measurement because it is composed of a low atomic number material. Organic scintillation detectors are widely used to check the presence or absence of radiation. The fluorescence of organic scintillators is produced by transitions between the energy levels of single molecules. In this study, an organic scintillator development study was conducted for use in gamma measurement, alternative materials for secondary solute used in basic organic scintillators were investigated, and the availability of alternative materials, detection characteristics, and neutron/gamma identification tests were performed. In other words, a secondary solute showing an improved energy transfer rate than the existing material was reported, and the performance was evaluated. 7-Diethylamino -4-methylcoumarin (DMC), selected as an alternative material, is a benzopyrone derivative in the form of colorless crystals, has high fluorescence and high quantum yield in the visible region, and has excellent light stability. In addition, it has a large Stokes shift characteristic, and solubility in solvent is good. Through this study, it was analyzed that the absorption wavelength range of DMC coincided with the emission wavelength range of PPO, which is the primary solute. Through this study, it was confirmed that the optimal concentration of DMC was 0.04wt%. As a result of performing gamma and neutron measurement tests using a DMC-based liquid scintillator, it showed good performance (FOM=1.42) compared to a commercial liquid scintillator. Therefore, the possibility of use as a secondary solute was demonstrated. Based on this, if studies on changes in the composition of secondary solute or the use of nanoparticles are conducted, it will be possible to manufacture and utilize a scintillator with improved efficiency compared to the existing scintillator.

Foot-and-mouth disease (FMD) is a highly contagious vesicular disease that affects cloven-hoofed animals, causing substantial economic losses to the livestock industry. The causative FMD virus (FMDV) comprises four structural proteins (VP1, VP2, VP3, and VP4) and several non-structural proteins. Among the capsid proteins, VP4 is the most conserved, making it an attractive target as a diagnostic and vaccine antigen, regardless of FMDV serotype. In this study, we attempted to express the VP4 protein N-terminally fused to a glutathione S-transferase (GST) tag in Escherichia coli. Whereas VP0 and VP2 proteins were expressed in the soluble fraction, we failed to detect VP4, even in the insoluble fraction. To investigate the effect of VP4 C-terminal amino acid residues on protein expression, we constructed three VP4 mutants fused to GST, among which the mutant in which the C-terminal 15 amino acid residues had been deleted showed the highest level of protein expression. Furthermore, protein expression was observed even in the mutant in which three amino acid residues (DKK) had been fused to the C terminus. However, unlike the other two mutants, the wild-type VP4 mutant was poorly expressed, thereby indicating that the C-terminal amino acid residues could play a pivotal role in determining expression of the VP4 protein in E. coli.

This study was to investigate an analytical method for determining dieckol content in Ecklonia stolonifera extract. According to the guidelines of International Conference on Harmonization. Method validation was performed by measuring the specificity, linearity, precision, accuracy, limit of detection (LOD), and limit of quantification (LOQ) of dieckol using high-performance liquid chromatography–photodiode array. The results showed that the correlation coefficient of calibration curve (R2) for dieckol was 0.9997. The LOD and LOQ for dieckol were 0.18 and 0.56 μg/mL, respectively. The intra- and inter-day precision values of dieckol were approximately 1.58-4.39% and 1.37-4.64%, respectively. Moreover, intra- and inter-day accuracies of dieckol were approximately 96.91- 102.33% and 98.41-105.71%, respectively. Thus, we successfully validated the analytical method for estimating dieckol content in E. stolonifera extract.

By polymerizing acrylonitrile in the presence of ammonium persulfate as an initiator and Pterocladia capillacea-activated carbon (P-AC) as a filler, a composite material polyacrylonitrile/Pterocladia capillacea-activated carbon (PAN/P- AC) was developed. By reacting hydroxylamine with the composite's nitrile groups, the prepared composite was functionalized by amidoximation. FTIR spectrometry, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and Brunauer–Emmett–Teller (BET) analysis were all applied to thoroughly characterize the fabricated adsorbent. For the treatment of Cr(VI) ions from synthetic solutions, the adsorption properties of amidoximated polyacrylonitrile/Pterocladia capillacea-activated carbon (PAO/P-AC) were investigated. The pH effect, uptake kinetics, adsorption isotherms, and thermodynamics studies were used to characterize adsorption properties. As a kinetic model analysis, the data confirmed that the pseudo-second-order rate equation matched well the adsorption process. With coefficients of determination (R2) of 0.9998, the Tempkin isotherm model had the lowest error, suggesting that it is the best fitted model to describe this adsorption mechanism. Thermodynamic parameters demonstrated that Cr(VI) adsorption was endothermic.

Bentonite is the most probable candidate to be used as a buffer in a deep geological repository with high swelling properties, hydraulic conductivity, thermal conductivity, and radionuclide sorption ability. Among them, the radionuclide sorption ability prevents or delays the transport of radionuclides into the nearby environment when an accident occurs and the radionuclide leaks from the canister, so it needs to be strengthened in terms of long-term disposal safety. Here, we proposed a surface modification method in which some inorganic additives were added to form NaP zeolite on the surface of the bentonite yielded at Yeonil, South Korea. We confirmed that the NaP zeolite was well-formed on the bentonite surface, which also increased the sorption efficiency of Cs and Sr from groundwater conditions. Both NaP and NaX zeolite can be produced and we have demonstrated that the generation mechanism of NaX and NaP is due to the number of homogeneous/heterogeneous nucleation sites and the number of nutrients supplied from an aluminosilicate gel during the surface modification process. This study showed the potential of surface modification on bentonite to enhance the safety of deep geological radioactive waste repository by improving the radionuclide sorption ability of bentonite.

본 연구는 피레스로이드계 살충제인 퍼메트린이 Heliothis virescens의 중추신경세포의 나트륨채널에 어떻게 작용하는 가를 전기생리학적으 로 관찰하였다. 퍼메트린은 나트륨채널의 꼬리전류(INa-tail)를 지속적으로 증가시켰으며 이러한 비정상적인 나트륨 전류증가가 나방류의 신경계에 과도한 흥분을 일으겨 살충작용을 하는 것으로 생각된다. 이러한 살충작용은 전갈독과 함께 사용했을때 약 8배의 증가가 있었음을 확인하였다. 전 갈독이 살충제의 독성을 강화하는 분자생리학적 기전연구가 계속되면 해충방제에 많은 기여를 할 것으로 생각된다.

(Bi1/2Na1/2)TiO3 (BNT)-based ceramics are considered promising candidates for actuator application owing to their excellent electromechanical strain properties However, to obtain large strain properties, there remain several issues such as thermal stability and high operating fields. Therefore, this study investigates a reduction of operating field in (0.98-x)Bi1/2Na1/ 2TiO3-0.02 BiAlO3-xSrTiO3 (BNT-2BA-100xST, x = 0.20, 0.21, 0.22, 0.23, and 0.24) via analyses of the microstructure, crystal structure, dielectric, polarization, ferroelectric and electromechanical strain properties. The average grain size of BNT-2BA- 100xST ceramics decreases with increasing ST content. Results of polarization and electromechanical strain properties indicate that a ferroelectric to relaxor state transition is induced by ST modification. As a consequence, a large electromechanical strain of 592 pm/V is obtained at a relatively low electric field of 4 kV/mm in 22 mol% ST-modified BNT-2BA ceramics. We believe that the materials synthesized in this study are promising candidates for actuator applications.

목적 : 본 연구는 일상생활재활 모델에 기초하여 지역사회에 거주하는 정신장애인에게 제공한 가정환경개선 서비스의 효과를 알아보고자 하는 예비연구이다. 연구방법 : 본 연구에는 정신장애인 가족 단체를 통해 모집된 만성 정신장애인 6명이 참여하였다. 각 대상 자별로 기초사정, 가정환경개선 및 일상생활 중재, 후속조치의 내용으로 총 3회기의 중재를 적용하였으며, 대면과 원격의 혼합 전달모형으로 제공되었다. 제공된 중재서비스의 임상적 효과를 확인하기 위해서 캐나다작업수행척도, 주거환경영향척도, 서비스 만족도 설문을 사용하였다. 중재 전후 참여자들의 작업수행 관련 변화 및 주거환경 영향인자의 변화를 평균값 비교 및 윌콕슨 부호 순위 검정으로 분석하였다. 연구결과 : 중재서비스 이후 모든 참가자들의 COPM 점수가 향상되었으며, 특히 대상자 중 2명이 보인 향상도는 임상적으로 의미 있는 수준이었다. 가정환경개선 중재 전후 주거환경 영향인자의 전체 점수 변화는 통계적으로 유의미한 차이가 있었다(Z = -2.201, p = .028). 총 5가지 측면에 대해 10점 만점으로 조사한 서비스 만족도에서 참가자들이 응답한 평균 점수는, 위험환경 개선이 6.5점, 무질서환경 개선이 7.8점, 일상생활 수행 개선이 8.8점, 전반적 서비스 만족도가 9.1점, 서비스 지속 희망은 9.1점인 것으로 나타났다. 결론 : 정신장애인 대상 가정환경개선 작업치료 서비스는 클라이언트의 주거환경 영향인자를 변화시키고 작업수행을 향상시키는 효과가 있다.

The preparation of graphene oxide and the modification of its surface directly with copper pentacyanonitrosylferrate (III) nanoparticles are presented in this work, as well as the characterization of the materials using Fourier-transform infrared spectra, X-ray diffractometry and scanning electron microscopy techniques. Beyond that, the study on the electrochemical behavior of the dispersed bimetallic complex on the graphene oxide, as known as GOCuNP, surface was carried out by the cyclic voltammetry technique. The graphite paste electrode modified with GOCuNP was successfully applied in the detection of hydrazine, presenting limit of detection of 1.58 × 10–6 mol L−1 at concentration range of 1.00 × 10–5 to 5.00 × 10–3 mol L−1 of hydrazine, being so the proposed bimetallic complex formed can be considered as a potential candidate for the manufacturing of electrochemical sensors for hydrazine detection.

목적 : 본 연구는 지역사회 거주 노인을 대상으로 가상현실 기반 일상생활활동 중재를 병행한 가정환경개선 서비스를 제공하였을 때 일상생활 안전 및 낙상 예방에 미치는 효과를 알아보고자 하였다. 연구방법 : 본 연구는 지역사회에 거주하는 만성질환 노인 9명을 대상으로 서비스를 제공하였다. 프로그램은 총 4회기에 걸쳐 제공되었으며 가정을 방문하여 주거환경 평가 및 수정을 진행하고 수정된 환경에 적응할 수 있도록 일상생활훈련을 진행하였다. 또한 대상자가 센터로 방문하여 가상현실 환경 내에서 일 상생활동작 훈련을 하였다. 아울러 일상생활활동 중재의 일환으로 운동 처방 및 코치를 제공하였다. 결과 : 중재 전·후 가정 내 안전 및 낙상 위험요소는 Home Falls and Accidents Screening Test(HOME-FAST) 평가 결과 평균 6.2(SD ± 3.9)에서 11.7(SD ± 3.7)로 개선되었다(p = .00). 낙상 관련 행동요인은 Falls Behavioural Scale(FaB) 평가 결과 97.8(SD ± 3.9)에서 103.1(SD ± 6.2)로 향상되었고(p = .02), 활동특이적 균형 자신감은 Activity-specific Balance Confidence Scale(ABC)평가결과 496.6(SD ± 303.7)에 서 742.2(SD ± 315.7)로 향상되었다(p = .02). HOME-FAST, FaB, ABC 모든 평가에서 서비스 전후 통계적으로 유의한 차이를 나타냄으로써 본 프로그램이 가정 내 낙상 예방 및 낙상 위험 행동요인의 개선에 효과가 있으며, 낙상에 대한 균형 자신감의 향상을 확인하였다. 또한, 본 연구에서 시행한 혼합형 중재 모델의 가정환경개선 서비스에 대하여 전반적인 만족도가 매우 높은 것으로 나타났다. 결론 : 가상현실기반 일상생활활동 중재를 병행한 가정환경개선 서비스 모델을 통해 지역사회 거주 노인의 낙상 예방과 일상생활에서의 안전사고 감소를 위한 효율적인 작업치료 중재가 이루어지기를 기대한다.