• 한국패류학회지
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• 제29권1호
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• pp.15-21
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• 2013

일산화질소 (NO) 는 면역계에서 세포내 외의 신호전달에 관여하는 물질로 생물의 생리적, 병리학적 기작을 조절한다. 본 연구는 바지락 혈구의 NO 농도 측정을 위해 4,5-diaminofluorescein diacetate (DAF-2 DA) 를 이용한 DAF assay의 적용이 가능한지 확인하고자 화상분석법, 형광흡광도 측정법 및 유세포분석 기법 등을 이용하였다. 연구결과 인위적인 바지락 혈구의 NO 생성을 위해 L-arginine을 첨가한 경우 대조구에 비하여 NO 생성이 유의적으로 증가하였고, 반대로 NO 저해제인 L-NAME를 첨가한 경우 NO 생성은 급격히 감소하였다. 이러한 결과는 본 조사에 이용된 화상분석법, 형광흡광도 측정법 및 유세포분석 기법 등 모든 조사 방법에서 동일하게 확인되었다. 특히 3가지 측정 방법 중 유세포 분석법은 측정의 신속성, 신뢰성 및 정확성을 담보할 수 있는 유용한 방법으로 판단된다. 따라서 유세포 분석기를 이용한 NO 측정은 향후 바지락의 생리적 병리적 특성을 확인하는데 유용한 마커로써 이용될 수 있을 것으로 기대된다.

• Animal cells and systems
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• 제1권3호
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• pp.457-462
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• 1997

Antibacterial activity was induced in the haemolymph of the common cutworm, Spodoptera litura by the artificial injection of E, coli Ek132. Antibacterial peptides were purified from the immunized haemolymph by heat treatment, ion-exchange chromatography, gel filtration chromatography, and reverse phase FPLC, and their physicochemical characteristics were investigated. These purified antibacterial peptides designated as spodopsin la and Ib were named after Spodoptera litura. Spodopsin la and Ib had the apparent molecular masses of 3, 823 Da and 3, 886 Da, respectively, and about 20% of the sequences had basic amino acids, such as lysine and arginine but no cysteine. Also, spodopsin l was confirmed to be a new member of cecropin family having a similar amino acid sequence to cecropin of lepidopteran insects, such as Bombyx mori and Hyalophora cecropia. The purified spodopsin was active against gram-positive as well as gram-negative bacteria.

• BMB Reports
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• 제45권2호
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• pp.91-95
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• 2012

Glutamate dehydrogenase from axenic bacterial cultures of a new microorganism, called GWE1, isolated from the interior of a sterilization drying oven, was purified by anion-exchange and molecular-exclusion liquid chromatography. The apparent molecular mass of the native enzyme was 250.5 kDa and was shown to be an hexamer with similar subunits of molecular mass 40.5 kDa. For glutamate oxidation, the enzyme showed an optimal pH and temperature of 8.0 and $70^{\circ}C$, respectively. In contrast to other glutamate dehydrogenases isolated from bacteria, the enzyme isolated in this study can use both $NAD^+$ and $NADP^+$ as electron acceptors, displaying more affinity for $NADP^+$ than for $NAD^+$. No activity was detected with NADH or NADPH, 2-oxoglutarate and ammonia. The enzyme was exceptionally thermostable, maintaining more than 70% of activity after incubating at $100^{\circ}C$ for more than five hours suggesting being one of the most thermoestable enzymes reported in the family of dehydrogenases.

• 한국자기공명학회논문지
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• 제14권2호
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• pp.127-133
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• 2010

Redox-dependent conformational change of human 8-kDa Dynein light chain (LC8) plays important role in regulating NF-${\kappa}B$ signaling pathway. In this study we characterized the structural states of the oxidized and reduced forms of LC8 by using NMR spectroscopy. The $^1H-^{15}N$ 2D HSQC spectra of oxidized LC8 indicated that no significant change in tertiary structure of LC8 occurred upon oxidation. The chemical shift perturbations of LC8 upon oxidation suggest a redox-dependent quaternary structural change.

• Parasites, Hosts and Diseases
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• 제50권2호
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• pp.181-183
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• 2012

The author reported previously on separation of the outer tegument of the spargana (plerocercoids of Spirometra mansoni) using high concentration of urea solution. To determine which layer of the tegument is separated by this method, an electron microscopic analysis has been processed in this study. It was confirmed that the basement layer of the tegument is separated from the parenchyme of the sparganum. In addition, the antigenicity of the separated outer tegument against the human sparganosis patient sera was evaluated. Numerous antigenic proteins, including 16 and 55 kDa proteins, were noticed in the separated tegument; however, there were no diagnostic 31/36 kDa molecules in this tegument. The molecules reactive with the patient sera in the tegument are to be characterized in future studies.

• 한국축산식품학회:학술대회논문집
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• 한국축산식품학회 2004년도 제34차 추계 국제 학술대회
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• pp.340-344
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• 2004

젖소 초유 중에 함유된 IGF-I rich fraction을 30kDa와 1kDa ultrafiltration(UF) membrane을 이용하여 효과적으로 분리하였으며 분획내의 IGF-I은 SDS-PAGE와 Western blot으로 확인하였다. 분획한 IGF-I rich fraction이 murine macrophage의 면역 활성에 미치는 영향을 실험한 결과 $1{\mu}g$ 투여군의 경우 IL-6는 7.3ng/ml, NO는 $10.7{\mu}M$을 생성하였고 Phagocytosis는 대조구 대비하여 65% 증진시켰다. $TNF-{\alpha}$의 분비량은 L929세포의 증식 저해율로 측정한 결과 대조구에 대비하여 30% 더 높은 저해율을 나타내었고, $H_2O_2$는 대조구에 대비하여 6% 더 높은 과산화수소를 생산하였다.

• 한국임상수의학회지
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• 제15권1호
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• pp.151-155
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• 1998

Abomasal motility was observed by needling to acupoints for 20 min. The acupoints used were guan yuan yurt da chang yurt dei yup pi yurt and hou hoi. The acupoint which showed the increase of the largest wave type was pi yu and the increase of wave type was observed 20 minutes after needling in hou hoi and dei yu acupoint. But there was no effect on abomasal motility after needling to guan yuan yu and da chang yu. On the other hands change in amplitude of the abomasal contraction after needling to these acupoints was not abserved. These results indicate that stimulation to pi yu acupoint would be the most useful to increase the abomasal motility.

• Journal of applied mathematics & informatics
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• 제42권2호
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• pp.353-366
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• 2024

A total coloring of a graph G is an assignment of colors to both the vertices and edges of G, such that no two adjacent or incident vertices and edges of G are assigned the same colors. In this paper, we have discussed the total coloring of M(T_n), M(D_n), M(DT_n), M(AT_n), M(DA(T_n)), M(Q_n), M(AQ_n) and also obtained the total chromatic number of M(T_n), M(D_n), M(DT_n), M(AT_n), M(DA(T_n)), M(Q_n), M(AQ_n).

• The Korean Journal of Physiology and Pharmacology
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• 제7권6호
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• pp.333-339
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• 2003

It has been demonstrated that an unidentified cytosolic factor(s) reduces $K_{ACh}$ channel function. Therefore, this study attempted to elucidate the cytosolic factor. Fresh cytosol isolated from normal heart (FC) depressed the $K_{ACh}$ channel activity, but cytosol isolated from the ischemic hearts (IC) did not modulate the channel function. Electrophorectic analysis revealed that a protein of ${\sim}80 kDa was markedly reduced or even lost in IC. By using peptide sequencing analysis and Western blot, this 80 kDa protein was identified as transferrin (receptor-mediated $Fe^{3+}$ transporter, 76 kDa). Direct application of transferrin (100 nM) to the cytoplasmic side of inside-out patches decreased the open probability ($P_o$, 12.7${\pm}6.4%, n=4) without change in mean open time (${\tau}_o$, $98.5{\pm}1.3$%, n=4). However, the equimolar apotransferrin, which is free of $Fe^{3+}$, had no effect on the channel activity (N*$P_o$, $129.1{\pm}13.5$%, n=3). Directly applied $Fe^{3+}$ (100 nM) showed results similar to those of transferrin (N*$P_o$: $21.1{\pm}3.9$%, n=5). However $Fe^{2+}$ failed to reduce the channel function (N*$P_o$, $106.3{\pm}26.8$%, n=5). Interestingly, trivalent cation La3+ inhibited N*$P_o$ of the channel ($6.1{\pm}3.0$%, n=3). Taken together, these results suggest that $Fe^{3+}$ bound to transferrin can modulate the $K_{ACh}$ channel function by its electrical property as a polyvalent cation.

• The Korean Journal of Physiology and Pharmacology
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• 제22권2호
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• pp.183-192
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• 2018

Post-traumatic stress disorder (PTSD) is a trauma-induced psychiatric disorder characterized by impaired fear extermination, hyperarousal, anxiety, depression, and amnesic symptoms that may involve the release of monoamines in the fear circuit. The present study measured several anxiety-related behavioral responses to examine the effects of berberine (BER) on symptoms of anxiety in rats after single prolonged stress (SPS) exposure, and to determine if BER reversed the dopamine (DA) dysfunction. Rats received BER (10, 20, or 30 mg/kg, intraperitoneally, once daily) for 14 days after SPS exposure. BER administration significantly increased the time spent in the open arms and reduced grooming behavior during the elevated plus maze test, and increased the time spent in the central zone and the number of central zone crossings in the open field test. BER restored neurochemical abnormalities and the SPS-induced decrease in DA tissue levels in the hippocampus and striatum. The increased DA concentration during BER treatment may partly be attributed to mRNA expression of tyrosine hydroxylase and the DA transporter in the hippocampus, while BER exerted no significant effects on vesicular monoamine transporter mRNA expression in the hippocampus of rats with PTSD. These results suggest that BER had anxiolytic-like effects on behavioral and biochemical measures associated with anxiety. These findings support a role for reduced anxiety altered DAergic transmission and reduced anxiety in rats with PTSD. Thus, BER may be a useful agent to treat or alleviate psychiatric disorders like those observed in patients with PTSD.