• 한국동물번식학회:학술대회논문집
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• 한국동물번식학회 2003년도 학술발표대회 발표논문초록집
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• pp.62-62
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• 2003

This study was carried out to investigate the effects of activation agents on parthenogenetic activation of pig oocytes matured in vitro. The medium used for oocyte maturation was tissue culture medium (TCM) 199 supplemented with 26.19 mM sodium bicarbonate, 0.9 mM sodium pyruvate, 10 $\mu\textrm{g}$/ml insulin, 2 $\mu\textrm{g}$/ml vitamin $B_{l2}$, 25 mM Hepes, 10 $\mu\textrm{g}$/ml bovine apotransferrin, 150 $\mu$M cysteamine, 10 IU/ml PMSG, 10 IU/ml hCG, 10 ng/ml EGF, 0.4% BSA, 75 $\mu\textrm{g}$/ml sodium penicillin G, 50 $\mu\textrm{g}$/ml streptomycin sulfate and 10% pFF. After about 22 h of culture, oocytes were cultured without cysteamine and hormones for 22 h at 38.5$^{\circ}C$, 5% $CO_2$ in air. Cumulus-free oocytes involving first polar body were activated by exposure to various concentrations of ethanol and exposure time of ethanol in Hepes-buffered NCSU23 medium. Also, oocytes were activated by electric pulse alone or combination with ethanol. For electrical activation, oocytes were rinsed twice in 0.3 M mannitol solution supplemented with 0.1 mM CaC1$_2$, 0.2 mM MgC1$_2$, 0.5 mM Hopes and 0.01% BSA, and transferred to a chamber consisting of two electrodes 1 mm apart which was overlaid with the same activation solution. Oocytes were activated with a single DC pulse of 1.3 ㎸/cm for 30 $\mu$sec. After activation treatments, oocytes were washed three times with Hepes-buffered NCSU23 medium and were washed twice with NCSU23 culture medium containing 0.4% BSA, and then cultured in 500 ${mu}ell$ of the same medium for 20 h at 38.5$^{\circ}C$, 5% $CO_2$ in air. The activation rates of oocytes were higher in 6, 7 and 8% ethanol concentrations compared with 0, 5, 9 and 10% ethanol concentrations. Significantly more oocytes (29.3~33.7%) were activated in the exposure for 8, 10, 12 and 15 min than those in the exposure for 0 and 5 min, but there was no difference due to exposure to 8% ethanol for 8 to 15 min. Electric pulse treatment followed by exposure to ethanol significantly improved the rate of oocyte activation (61.9%) compared with that of other 3 treatments. In conclusion, the optimal activation treatment of ethanol exposure alone for the in-vitro matured pig oocytes was 8% ethanol for 8 to 15 min. Electric pulse treatment followed by ethanol exposure significantly improved the rate of activation.n.

• Clinical and Experimental Pediatrics
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• 제46권2호
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• pp.192-194
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• 2003

가정분만으로 태어난 후 생후 6일된 신생아에서 전신성 강직-간대 경련이 발생하여 내원한 환아에서, 병력과 진찰 소견상 신생아 파상풍으로 진단하여 근이완제 및 인공환기요법으로 치료한 1례를 경험하였기에 보고하는 바이다.

• 한국응용곤충학회지
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• 제49권3호
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• pp.251-259
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• 2010

톱다리개미허리노린재(Riptortus clavatus)의 장내세균이 분리되었다. 형태학적 분석과 생화학적 분석을 통하여 세균이 Staphylococcus succinus와 가장 유사한 것으로 동정되었다. 16S rRNA 유전자의 염기서열은 이러한 동정 결과를 뒷받침했다. 페니실린G를 톱다리개미허리노린재 성충에게 경구투여 하였을 때 장내세균 밀도 감소와 치사 효과를 유발하였다. 동일한 방법으로 곤충병원세균(Xenorhabdus nematophila)의 세 가지 대사물질(benzylideneacetone, proline-tyrosine, and acetylated phenylalanine-glycine-valine)을 처리하였을 때, 톱다리개미허리노린재 장내세균의 밀도감소와 치사효과를 확인하였다. 이러한 결과는 톱다리개미허리노린재의 장내세균이 Staphylococcus sp.이며, 곤충병원세균 대사물질의 항균 활성이 장내세균과 궁극적으로 톱다리개미허리노린재의 생존에 영향을 미친다는 것을 제시하였다.

• Advances in Traditional Medicine
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• 제3권4호
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• pp.191-195
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• 2003

Euphorbia hirta, locally called 'ara tanah' or 'susun nabi' in Malaysia is a small annual herb common to the tropical countries and belongs to the same family as the tic and tapioca. E. hirta has had a long history of usage in the treatment of various ailments. In this current study, in vitro sensitivity test of crude aqueous and ethanol extracts of leaves and barks of E. hirta was carried out against bacteria (Escherichia coli, Salmonella enteritidis, Staphylocccus aureus and Bacillus subtilis) and fungi (Microsporum canis, Aspergillus fumigatus, Candida albicans and Candida tropicalis) using the discs diffusion method. The extract-impregnated discs (20, 40 and $80\;{\mu}g/{\mu}l$), the E. hirta extracts inhibited the growth of all the bacteria tested. The growth of C. albicans was inhibited in a concentration dependent manner by the aqueous leaves and barks extracts. C. tropicalis was found to be sensitive to the aqueous leaves extracts. The results were compared to antibacterial drugs of chloramphenicol, ampicilin, penicillin G, and enrofloxacine; and to antifungal drug of ketoconazole, itraconazole and miconazole. In this current study, it can be concluded that this plant has antimicrobial activity that is as potent as the standard antimicrobial drugs against certain microorganisms.

• Journal of Yeungnam Medical Science
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• 제30권1호
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• pp.10-16
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• 2013

Background: Toll-like receptors (TLRs) are well-known pattern recognition receptors. Among the 13 TLRs, TLR2 is the most known receptor for immune response. It activates mitogen-activated protein kinases (MAPKs), which are counterbalanced by MAPK phosphatases [MKPs or dual-specificity phosphatases (DUSPs)]. However, the regulatory mechanism of DUSPs is still unclear. In this study, the effect of a TLR2 ligand (TLR2L, Pam3CSK4) on DUSP4 expression in Raw264.7 cells was demonstrated. Methods: A Raw264.7 mouse macrophage cell line was cultured in Dulbecco's modified Eagle's medium supplemented with 10% fetal bovine serum and 1% antibiotics (100 U/mL penicillin and 100 g/mL streptomycin) at $37^{\circ}C$ in 5% $CO_2$. TLR2L (Pam3CSK4)-mediated DUSP4 expressions were confirmed with RT-PCR and western blot analysis. In addition, the detection of reactive oxygen species (ROS) was measured with lucigenin assay. Results: Pam3CSK4 induced the expression of DUSP1, 2, 4, 5 and 16. The DUSP4 expression was also increased by TLR4 and 9 agonists (lipopolysaccharide and CpG ODN, respectively). Pam3CSK4 also induced ERK1/2 phosphorylation and ROS production, and the Pam3CSK4-induced DUSP4 expression was decreased by ERK1/2 (U0126) and ROS (DPI) inhibitors. U0126 suppressed the ROS production by Pam3CSK4. Conclusion: Pam3CSK4-mediated DUSP4 expression is regulated by ERK1/2 and ROS. This finding suggests the physiological importance of DUSP4 in TLR2-mediated immune response.

• Asian-Australasian Journal of Animal Sciences
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• 제29권4호
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• pp.586-593
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• 2016

A new methanogen was isolated from an anaerobic digester using pig slurry in South Korea. Only one strain, designated KOR-1, was characterized in detail. Cells of KOR-1 were straight or crooked rods, non-motile, 5 to $15{\mu}m$ long and $0.7{\mu}m$ wide. They stained Gram-positive and produced methane from $H_2+CO_2$ and formate. Strain KOR-1 grew optimally at $38^{\circ}C$. The optimum pH for growth was 7.0. The strain grew at 0.5% to 3.0% NaCl, with optimum growth at 2.5% NaCl. The G+C content of genomic DNA of strain KOR-1 was 41 mol%. The strain tolerated ampicillin, penicillin G, kanamycin and streptomycin but tetracycline inhibited cell growth. A large fragment of the 16S rRNA gene (~1,350 bp) was obtained from the isolate and sequenced. Comparison of 16S rRNA genes revealed that strain KOR-1 is related to Methanobacterium formicicum (98%, sequence similarity), Methanobacterium bryantii (95%) and Methanobacterium ivanovii (93%). Phylogenetic analysis of the deduced mcrA gene sequences confirmed the closest relative as based on mcrA gene sequence analysis was Methanobacterium formicicum strain (97% nucleic acid sequence identity). On the basis of physiological and phylogenetic characteristics, strain KOR-1 is proposed as a new strain within the genus Methanobacterium, Methanobacterium formicicum KOR-1.

• 한국식품위생안전성학회지
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• 제15권1호
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• pp.41-45
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• 2000

Induction of DNA fragmentation of rat embryonic midbrain cells was studied to see whether apoptosis plays a role in OTA-induced microcephaly observed in cultured rat whole embryos during embryogenesis. We first cultured whole embryos (prepared from day 9.5 gestation rats) for 48 hrs with OTA and found that OTA induced microcephaly in cultured rat whole embryos. We also examined whether the microcephaly seen in cultured whole embryos is partially related to the increase of apoptosis of undifferentiated embryonic midbrain cells. Embryonic midbrain cells were prepared from day 12 gestation rat embryos, and cultured in the mixture media of Dulbecco's modified eagle's medium nutrient and Ham's F12 (1：1) containing 10% Nuserum, 100 $\mu\textrm{g}$/ml of streptomycin and 100 units/ml of penicillin for 96 hrs. Induction of DNA fragmentation was increased by 0.25-1 $\mu\textrm{g}$/ml OTA in a dose dependent manner in the embryonic midbrain cells. We also tested whether increase of apoptosis by OTA would be associated with change of apoptosis-related proteins (TNF-$\alpha$ and P$^{53}$ ) level in embryonic midbrain cells. OTA also increased TNF-$\alpha$ and P$^{53}$ levels. These results show that OTA induced microcephaly in cultured whole embryos and this effect may be at least a part due to the induction of apoptosis and apoptosis-related protein levels of undifferentiated embryonic midbrain cells.

• Asian-Australasian Journal of Animal Sciences
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• 제32권10호
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• pp.1580-1590
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• 2019

Objective: The aims of this study were to select one strain of Lactobacillus plantarum (L. plantarum) for a potential indigenous safe starter culture with low level antibiotic resistant and low biogenic amine production and evaluate its effect on biogenic amines reduction in Moo som. Methods: Three strains of indigenous L. plantarum starter culture (KL101, KL102, and KL103) were selected based on their safety including antibiotic resistance and decarboxylase activity, and fermentation property as compared with a commercial starter culture (L. plantarum TISIR543). Subsequently, the effect of the selected indigenous safe starter culture on biogenic amines formation during Moo som fermentation was studied. Results: KL102 and TISIR 543 were susceptible to penicillin G, tetracycline, chloramphenicol, erythromycin, gentamycin, streptomycin, vancomycin, ciprofloxacin and trimethoprim (MIC90 ranging from 0.25 to $4{\mu}g/mL$). All strains were negative amino acid-decarboxylase for lysis of biogenic amines in screening medium. For fermentation in Moo som broth, a relatively high maximum growth rate of KL102 and TISIR543 resulted in a generation time than in the other strains (p<0.05). These strain counts were constant during the end of fermentation. Similarly, KL102 or TISIR543 addition supported increases of lactic acid bacterial count and total acidity in Moo som fermentation. For biogenic amine reduction, tyramine, putrescine, histamine and spermine contents in Moo som decreased significantly by the addition KL102 during 1 d of fermentation (p<0.05). In final product, histamine, spermine and tryptamine contents in Moo som inoculated with KL102 were lower amount those with TISIR543 (p<0.05). Conclusion: KL102 was a suitable starter culture to reduce the biogenic amine formation in Moo som.

• 한방비만학회지
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• 제18권2호
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• pp.57-63
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• 2018

Objectives: Metabolic syndrome is defined by a cluster of major cardiovascular risk factors: obesity, insulin resistance, dyslipidemia, and arterial hypertension. Several members of a large family of nonselective cation entry channels, e.g., transient receptor potential vanilloid 4 (TRPV4) channels have been associated with the development of dyslipidemia and hypertension. The purpose of this study was to investigate the effects of Leejung-tang (Lizhong-tang), Rikkunshito, and Bojungikgi-tang (Buzhongyiqi-tang) on TRPV4 channel. Methods: Human embryonic kidney 293 cells stably transfected with the TRPV4 expression vectors were maintained in Dulbecco's modified Eagle's medium supplemented with 10% fetal bovine serum, 1% penicillin/streptomycin, $5{\mu}g/mL$ blasticidin, and 0.4 mg/mL zeocin in a humidified 20% $O_2/10%$ $CO_2$ atmosphere at $37^{\circ}C$. Whole-cell patch clamp recordings were obtained using an Axopatch 700B amplifier and pClamp v.10.4 software (Molecular Devices, San Jose, CA, USA), and signals were digitalized at 5 kHz using Digidata 1422A. Results: Leejung-tang and Rikkunshito (10, 30 and 50 mg/mL) had no effects on the TRPV4 whole-cell currents at dose dependent manner. However, Bojungikgi-tang (10, 30, and 50 mg/mL) inhibited the TRPV4 whole-cell currents in a dose dependent manner and the half maximal inhibitory concentration (IC50) of Bojungikgi-tang was 18.2 mg/mL. Conclusions: These results suggest that Bojungikgi-tang plays an important roles to inhibit the TRPV4 channel, suggesting that Bojungikgi-tang is considered one of the candidate agents for the treatment of metabolic syndrome such as dyslipidemia and hypertension.

• 한국임상수의학회지
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• 제16권2호
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• pp.375-380
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• 1999

This study was conducted to develop an intrauterine inseminator (IUI) to deposit of frozen semen into uterus and to evaluate the results obtained after artificial insemination by IUI. Two Japanese spitzs (2 to 4 years of age) were used as semen donors. Semen was collected by manual masturbation into sterile glass collection tubes and separated into 3 fractions with only the sperm-rich fractions retained for further examination. Sperm motility >70%, sperm concentration of 200 to $400{\times}10^6 cells/ml$$\times$g for 5 min and poured out the suspended solution, and then diluted with 2 ml Tris-buffer which was consisted of 2.4 g Tris, 1.4 g citric acid, 0.8 g glucose, 0.1 $\mu\textrm{g}$/ml streptomycin, 100 IU/ml penicillin, 20 ml egg yolk to 100 ml mili-Q water (Ext I) or supplemented with 8 ml glycerol and 1 ml Equex STM paste to 100 rnl (Ext II). The diluted semen was cooled to 5$^{\circ}C$ in cold room, where the temperature in the sample reached 5$^{\circ}C$. Two h after beginning the cooling procedure, 2 ml of Ext II, also at 5$^{\circ}C$, was added and mixed by gently reversing the tubes several times during 1 h. The final sperm concentration for freezing was approximately $50{\times}10^6 cells/ml$. After equilibration, the semen was loaded into 0.5 ml straw and frozen on the liquid nitrogen vapour in styrofoam box. The straws were thawed at 7$0^{\circ}C$ for precisely 6 sec. After thawing of each straw, the frozen semen can survived over 50% motility. All the females were inseminated twice with 1 ml of $25{\times}10^6 cells/ml$