• Archives of Pharmacal Research
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• 제3권1호
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• pp.7-12
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• 1980

Ampliciline was synthesized from 6-amino-pencillanic acid (6-APA) and D-.alpha. phenylglycine methyl ester by using amplicilin synthesizing enzyme from Peudomonas melanogenum (IAM 1655). The whole cell enzyme was immobilized by entrapping it in the polyacrylamide gel lattices. The polymer used in the enzyme entrapment was made from 150 mg per ml of acrylamide monomer and 8 mg per ml of N, N'-methylenebisacrylamide. About 200 mg/whole cell enzyme was mixed in the polymer for entrapment. The maximal activity retention after immobilization was 56%. The optimal pH values for the whole cell enzyme and the immobilized whole cell enzyme were 6.0 and 5.9, respectively. The optimal temperature for the enzyme activity were the same for both type of preparations. The enzyme stabilities against pH and heat increased for immobilized whole cell enzyme. Immobilized cell was more stable especially in the acidic condition while both type were found to be very suceptible to thermal inactivation at a temperature above 4.deg.C. The kinetic constants obtained from Lineweaver-Burk plot based on two substate reaction mechanism showed somewhat higher value for immobilized whole cell enzyme as compared to the whole cell enzyme : the Km value for 6-APA were 7.0 mM and 12.5 mM while Km values for phenylglycine methyl ester were 4.5 mM and 8.2 mM, respectively. Using the immobilized whole cell enzyme packed in a column reactor, the productivity of ampiciline was studied by varying the flow rate of substrate solution. At the space velocity, SV, 0.14 hr$^{-1}$ the conversion was 45%. Operational stability found in terms of half life was 30 hr at SV = 0.2 hr.

• 한국축산식품학회지
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• 제34권6호
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• pp.742-748
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• 2014

This study was conducted to evaluate the activities of antioxidant enzyme (glutathione peroxidase (GSH-Px)) and lysosomal enzymes (alpha-glucopyranosidase (AGP) and beta-N-acetyl-glucosaminidase (BNAG)) of the longissimus dorsi (LD) muscle from Hanwoo (Korean cattle) in three freezing conditions. Following freezing at -20, -60, and $-196^{\circ}C$ (liquid nitrogen), LD samples (48 h post-slaughter) were treated as follows: 1) freezing for 14 d, 2) 1 to 4 freeze-thaw cycles (2 d of freezing in each cycle), and 3) refrigeration ($4^{\circ}C$) for 7 d after 7 d of freezing. The control was the fresh (non-frozen) LD. Freezing treatment at all temperatures significantly (p<0.05) increased the activities of GSH-Px, AGP, and BNAG. The $-196^{\circ}C$ freezing had similar effects to the $-20^{\circ}C$ and $-60^{\circ}C$ freezing. Higher (p<0.05) enzymes activities were sustained in frozen LD even after 4 freeze-thaw cycles and even for 7 d of refrigeration after freezing. These findings suggest that freezing has remarkable effects on the activities of antioxidant enzyme and lysosomal enzymes of Hanwoo beef in any condition.

• 한국임상약학회지
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• 제3권1호
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• pp.79-88
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• 1993

Bioequivalence(BE) test of commercially available sustained release tablets of diltiazem hydrochloride(DTZ) was performed to give some guidelines to BE test in korea in case of which drugs with low oral bioavaiiability(BA) due to substantial first-pass hepatic loss form pharmacologically active metabolites. In such cases, the pharmacologic activity after oral administration is greater than anticipated from BA data, based on chemical assay of drug alone. Therefore, this paper explores the use and meaning of area under the plasma concentration-time(AUC) data of parent and its metabolites to access BA if sustained release tablets. Normal healthy male volunteers(n=14) were randomly divided into 2 groups, and sustained release reference$(Herbesser^{(R)})$ and test$(Herben^{(R)})$ tablets of DTZ-30mg were given orally by balanced two-period cross-over dosing schedule. The plasma concentration of DTZ and and its active metabolite, desacetyldiitiazem(DAD), were determined by high performance liquid chromatography, and, $AUC_{DTZ},\;AUC_{DAD},\;AUC_{DTZ+DAD},\;C_{max}\;and\;T_{max}$ obtained. Analysis of varlance(ANOVA) showed that $AUC_{DTZ}\;and\;C_{max}$ passed the standard $(\alpha=0.05,\;1-\beta\geq0.8,\;\Delta\leq0.2)$ of BE test of korea, but $AUC_{DAD}$ was not satisfied from the standpoint of power. On the other hand, $AUC_{DTZ\midDAD}$ may be more avaliable than $AUC_{DAD}$ from the standpoint of statistics and pharmacologic equivalence.

• Bulletin of the Korean Chemical Society
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• 제30권7호
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• pp.1489-1496
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• 2009

This study was done for the determination and excretion profile of adrenosterone and its metabolites in human urine using both liquid chromatography with atmospheric pressure chemical ionization mass spectrometry and gas chromatography with mass spectrometry. Adrenosterone and its two metabolites were detected in human urine after administration a healthy volunteer with 75 mg of adrenosterone. We found that adrenosterone-M1 ($C_{19}H_{26}O_3$) was a reduction and adrenosterone-M2 ($C_{19}H_{26}O_4$) was a hydroxylation at C-ring, which did not know the exact position of the C-ring. The adrenosterone parent was detected by GC/TOF-MS, but not detected by LC/APCI/MS because of low intensity. Adrenosterone and its two metabolites were excreted as their glucuronided fractions. The recovery of this method ranged from 100.7 to 118.4% and the reproducibility and accuracy test were 85.5 to 112.0% and 1.1 to 8.4%, respectively. The excretion studies showed that adrenosterone and its metabolites were detectable in human urine during a 48 h period after oral administration, with maximum level of excretion at 4.1 h. The glucuro-/sulfaconjugated ratio of adrenosterone, M1 and M2 was 0.73 ${\pm}$ 0.03, 0.96 ${\pm}$ 0.06 and 0.89 ${\pm}$ 0.03 (n = 6), respectively. The amounts of adrenosterone excreted in urine were 14.75 ng for 48 h. Also, the maximum level of androsterone and 11$\beta$-hydroxy androsterone, which were endogenous steroids, were reached 4.1 h after the oral administration of adrenosterone.

• BMB Reports
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• 제37권4호
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• pp.408-415
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• 2004

The expression of the Paenibacillus sp. A11 cyclodextrinase (CDase) gene using the pUC 18 vector in Escherichia coli JM 109 resulted in the formation of an insoluble CDase protein in the cell debris in addition to a soluble CDase protein in the cytoplasm. Unlike the expression in Paenibacillus sp. A11, CDase was primarily observed in cytoplasm. However, by adding 0.5 M sorbitol as an osmolyte, the formation of insoluble CDase was prevented while a three-fold increase in cytoplasmic CDase activity was achieved after a 24 h-induction. The recombinant CDase protein was purified to approximately 14-fold with a 31% recovery to a specific activity of 141 units/mg protein by 40-60% ammonium sulfate precipitation, DEAE-Toyopearl 650 M, and Phenyl Sepharose CL-4B chromatography. It was homogeneous by non-denaturing and SDS-PAGE. The enzyme was a single polypeptide with a molecular weight of 80 kDa, as determined by gel filtration and SDS-PAGE. It showed the highest activity at pH 7.0 and $40^{\circ}C$. The catalytic efficiency ($k_{cat}/K_m$) values for $\alpha$-, $\beta$-, and $\gamma$-CD were $3.0{\times}10^5$, $8.8{\times}10^5$, and $5.5{\times}10^5\;M^{-1}\;min^{-1}$, respectively. The enzyme hydrolyzed CDs and linear maltooligosaccharides to yield maltose and glucose with less amounts of maltotriose and maltotetraose. The rates of hydrolysis for polysaccharides, soluble starch, and pullulan were very low. The cloned CDase was strongly inactivated by N-bromosuccinimide and diethylpyrocarbonate, but activated by dithiothreitol. A comparison of the biochemical properties of the CDases from Paenibacillus sp. A11 and E. coli transformant (pJK 555) indicates that they were almost identical.

• 대한예방한의학회지
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• 제14권1호
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• pp.49-58
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• 2010

Objective : The purpose of this study is to examine safety of herbal medicine on liver function and compare with western medicine. Method : 303 subjects of skin disease(vitiligo and psoriasis) were chosen at a local oriental medical clinic, and tested with a spot liver function test from Sept 1, 2006 to Dec 31, 2006. Subjects were grouped into untreated, herbal medicine, western medicine, and combination group by treatment record. Total bilirubin, AST, ALT and LDH was compared in each group, odds ratio and regression coefficient was calculated. Results : Subjects comprised of 116 individuals receiving western medication(38.28%), 54 receiving herbal medication(17.82%), 107 receiving combined forms of medication(35.31%), and 26 individuals without any types of medication(8.58%). With the mean age of 37.0 yr. 204 were male(67.3%), 99 were female(32.7%). Comparing variables of liver functions, there was no significant difference between the control and experiment groups. After adjusting potential confounders, monthly $\beta$(SE) of multiple regression -0.009~0.000 for the herbal group, -0.005~0.000 for the western group, and -0.001~0.001 for the combination group. No significant difference between the groups. OR of T-bilirubin were 1.02, 1.05, and 1.04. AST were 0.92, 0.94, and 0.98. ALT were 0.85, 0.99, and 0.97. LDH were 0.96, 1.06, 1.00 for the herbal, western, and combination group, respectively. Conclusion : Comparing with western medication, herbal medication did not cause special ill-effect on the liver function based on liver function tests.

• 한국전기전자재료학회논문지
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• 제17권7호
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• pp.691-696
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• 2004

The electronic state and chemical bonding of $\beta$-MnO$_2$ with transition metal dopants were theoretically investigated by DV-X$_{\alpha}$ (the discrete variational X$_{\alpha}$) method, which is a sort of the first principles molecular orbital method using the Hartree-Fock-Slater approximation. The calculations were performed with a $_Mn_{14}$ MO$_{56}$ )$^{-52}$ (M = transition metals) cluster model. The electron energy level, the density of states (DOS), the overlap population, the charge density distribution, and the net charges, were calculated. The energy level diagram of MnO$_2$ shows the different band structure and electron occupancy between the up spin states and down spin states. The dopant levels decrease between the conduction band and the valence band with the increase of the atomic number of dopants. The covalency of chemical bonding was shown to increase and ionicity decreased in increasing the atomic number of dopants. Calculated results were discussed on the basis of the interaction between transition metal 3d and oxygen 2p orbital. In conclusion it is expected that when the transition metals are added to MnO$_2$ the band gap decreases and the electronic conductivity increases with the increase of the atomic number of dopants. the atomic number of dopants.

• 한국자기학회지
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• 제5권5호
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• pp.366-371
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• 1995

High performance magnetic materials are characterized by the combination of outstanding magnetic properties and optimized microstructures, e.g., nanocrystalline composites of multilayers and small particle systems. The characteristic parameters of the hysteresis loops of these materials vary over more than a factor of $10^{6}$ with optimum values for the coercive field of several Tesla and permeabilities of $10^{6}$. Within the framework of the computational micromagnetism (nanomagnetism) using the finite element method the upper and lower bounds of the coercive field of different types of grain ensembles and multilayers have been determined. For the case of nanocrystalline composites the role of grain size, exchange and dipolar coupling between grains and the degree of grain alignment will be discusses in detail. It is shown that the largest coercivities are obtained for exchange decoupled grains, whereas remanence enhancing requires exchange coupled grains below 20 nm. For composite permanent magnets based on $Nd_{2}Fe_{14}B$ with an amount of ~ 50% soft $\alpha$-Fe-phase coercivities of ${\mu}_{0}H_{c}=0.75\;T$, a remanence of 1.5 T and an energy product of $400\;kJ/m^{3}$ is expected. In nanocrystalline systems the temperature dependence of the coercivity is well described by the relation ${\mu}_{0}H_{c}=(2\;K_{1}/M_{s}){\alpha}-N_{eff}{\mu}_{0}M_{s}$, where the microstructural parameters $\alpha$ and $N_{eff}$ take care of the short-range perturbations of the anisotropy and $N_{eff}$ is related to the long-range dipolar interactions. $N_{eff}$ is found to follow a logarithmic grain size size dependence ${\mu}_{0}H_{c}=(2\;K_{1}/M_{s}){\alpha}-N_{eff}(\beta1nD){\mu}_{0}M_{s}$. Several trends how to achieve the ideal situation $\alpha$->1 and $N_{eff}$->1->0 will be discussed.

• 한국약용작물학회지
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• 제2권3호
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• pp.198-204
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• 1994

세신(細辛)(족도리풀:Asiasarum sieboldii)의 근경삽에 미치는 생장조정물질의 효과와 차광정도가 생육 및 수량에 미치는 영향을 검토한 결과는 다음과 같다. 1. 세신의 근경에 auxin을 침지하여 삽목한 결과 IAA, IBA, NAA 모두 대조구에 비하여 지하부 생육이 현저하게 양호하여 뿌리발생수는 IAA 침지에서 13.6개, 근장과 측근 수는 IBA처리에서 8.9cm와 39.8개로 가장 양호하였다. 2. 근경의 auxin 처리가 지상부 생육에는 큰 영향을 주지 않았으나 IAA 침지에서 분아수 2.8개, 엽수 1.3매로 처리중 양호하였으며, 특히 식물 체중은 대조구에 비해 현저한 증가를 보였다. 3. 차광정도가 높을수록 세신의 생육은 양호하여 초장과 엽장은 평야부인 이리에서 75+50% 차광에서 15.3cm와 9.6매였고, 산간부인 진안에서는 75% 차광에서 15.3cm와 10.5매로 조사되었다. 근장과 근수는 이리에서 75% 차광시 12.5cm와 18.9개였고 진안에서는 50% 차광처리에서 14.0cm와 20.1개로 나타났다. 4. 엽 고사기는 지역에 따라 차이를 보여 평야지보다 산간부에서 늦게 나타났고, 노지 재배의 경우 이리는 7월 20일, 진안은 8월 10일이었다. 그리고 차광재매로 이리는 75+50% 차광에서 9.12일경 까지, 진안은 50% 차광에서 9.16일경까지 세신의 생육을 연장할 수 있었다. 5. 세신의 수량성은 재배지역에 따라 차이를 보여 노지재배의 경우 10a당 수량은 평야지에서 70.1 kg, 산간지에서 85.0kg이었다. 차광재배에 의한 수량은 현저히 높아져 이리에서 75+50%차광에서 99.5kg, 진안에서는 50% 차광처리에서 118.2kg의 수량을 얻어 세신의 재배에는 $75%{\sim}50%$차광이 유리 할 것으로 생각되었다.향(百里香)에서 많이 검출(檢出)되었으며, 섬백리향(百里香)을 부위별(部位別)로 비교(比較)했을 때 thymol, ${\gamma}-terpinene$은 잎에서 많이 검출(檢出)되었으나 f-cymene은 잎보다는 꽃에서 특징적(特徵的) 으로 많이 검출(檢出)되는 경향(傾向)을 보였다.{\beta}-gurjunene$, ar-curcumene+geranvl acetate 등의 함량비가 높아 생강의 부위에 따른 항기 성분 조성 pattern 또한 상당한 차이를 보였다.다 유의하게 낮았다(P<0.01). 백신 접종후 부작용 발생률이 피내주사군에서 31.6%로서 근육주사군의 14.8%보다 높은 것으로 나타났으며, 근육주사군에서는 피로감, 발열 등의 전신부작용과 주사부위의 동통이 흔히 나타났으며, 피내주사군에서는 색소침착 등의 국소부작용이 흔하게 나타났다. 결 론 : 유전자재조합 B형간염백신은 항체양전율이나 항체역가면에서 0, 1, 2개월 방법보다는 0, 1, 6개월 방법 이 효과적이며, 소량 피내접종에 의한 면역효과는 기존의 근육주사법과 동등한 것으로 사료된다. 후 일초 노력성 호기량은 수술 후 24시간에서 $1.33{\pm}0.56L,\;1.00{\ge}0.28L$로 유의한 차이를 보였고(t=2.530, P=0.017), 술 후 72시간에서 $1.72{\pm}0.65L,\;1.33{\pm}0.3L$로 유의한 차이를 보였다(t=2.540, P=0.016). 6) 대상자의 술 후 폐환기능에 영향을 미치는 요인은 성별로 나타났다. 이에 따른 폐환기능의 차이를 보면, 실험군의 술 후 노력성 폐활량이 48시간에 남자($1.78{\pm}0.61L$)가 여자($1.27{\pm}0.45L$)보다 더 높게 나타났으며

• Journal of Yeungnam Medical Science
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• 제16권1호
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• pp.60-68
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• 1999

전국의 신생아 수련 병원에 설문지를 보내어 각 병원의 1997년 1월부터 12월까지 출생한 신생아 중 패혈증으로 진단되고 혈액 배양 검사에서 균이 검출된 경우, 병록지를 통해 후향적 조사를 실시하였고, 37개 병원에서 참여해 34.9%의 응답율을 나타내었으며, 결과는 다음과 같다. 1) 신생아 패혈증의 발생 빈도는 평균 0.73%(0~2.95%)였고, 남녀 비는 1.15:1이었다. 2) 신생아 패혈증의 원인균은 candida류를 포함하여 64종의 균이 검출되었다. 가장 흔한 원인균은 S. aureus였고, S. epidermidis, CONS의 순으로 많았다. 3) 조기 신생아 패혈증의 가장 흔한 원인균은 S. aureus였으며 CONS와 S. epidermidis가 그 다음으로 많았다. 후기 신생아 패혈증도 S. aureus가 가장 많이 검출되었고. S. epidermidis, CONS의 순으로 많았다. 4) 신생아 패혈증에 관련된 산모의 위험인자는 조기 파수가 104명(21.8%)으로 가장 많았고, 그 외에 난산, 태아의 빈맥, 융모양막염, 산모감염의 순이었다. 5) 신생아 패혈증과 연관된 국소 감염의 분포는 73명(26.1%)의 환아에서 폐렴이 동반되어 가장 많은 빈도를 보였고, 요로 감염, 뇌막염, 관절염의 순으로 많았다. 6) 신생아의 병원내 감염의 가장 흔한 원인균으로는 S. spidermidis가 가장 많았고, S. aureus, Entero-bacter의 순이었다. 7) 도관과 관련된 신생아 패혈증의 원인균은, S. aureus가 가장 많았고, S. epidermidis, Enterobacter의 순으로 많았다. Candida는 8례에서 발견되었다. 8) 그람 양생균의 항생제에 대한 반응검사에서 Penicillin이나 oxacillin에 대해 S. aureus, S. epidermidis, CONS 모두 30% 이하의 감수성을 보였다. Vacomycin에 대해서는 S. aureus, CONS, Enterococcus 각각 1례에서 내성을 나타내었다. 9) 그람 음성균의 항생제에 대한 반응검사에서 Gentamicin에 대해서 60% 정도의 감수성을 나타내었고, amikacin에 대해서는 80% 이상의 감수성을 보였다. Piperacillin과 aztreonam에 대해서, Pseudomonas가 100%의 감수성, ticarcillin에 대해서는 Klebsiella가 100%의 감수성을 나타내었다.