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Amplicilin biosynthesis by immobilized enzyme

  • Kim, Young-Sik;Ryu, Dewy-D.Y.
    • Archives of Pharmacal Research
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    • v.3 no.1
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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.

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Effects of Extrusion and Enzyme Treatment on Characteristics of Whole Grains (압출성형 및 효소처리가 전곡립의 특성에 미치는 효과)

  • Shin, Hae-Hun;Park, Bo-Sun;Lee, Sun-Hee;Kim, Young-Sook;Hwang, Jae-Kwang
    • Korean Journal of Food Science and Technology
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    • v.37 no.1
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    • pp.15-22
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    • 2005
  • Extrusion with enzyme treatment improved processing characteristics and physiological activity of whole grains, strongly suggesting industrial potential of whole grains for production of cereal-based functional foods containing activated nutraceuticals. Physicochemical properties of whole grains prepared by extrusion were characterized in terms of vitamin, mineral, and resistant starch contents, gelatinization, and digestibility in comparison with those of raw and roasted grains. Extrusion increased grain gelatinization, with degree of gelatinization in extruded barley being seven times higher than that of raw barley. Extrusion improved digestibility of whole grains in comparison with those of raw and roasted grains. Dispersibility of starch was improved through extrusion, while content of resistant starch decreased. Release of ${\beta}-sitosterol$ present in whole grains increased 13-fold when both extrusion and enzyme treatment were used.

Effect of whole body cryotherapy with spinal decompression on lumbar disc herniation by functional assessment measures (기능적 평가 측정을 통하여 전신냉기치료와 척추 감압기 적용이 요추 추간판 탈출증 환자에게 미치는 효과)

  • Ma, Sang-Yeol
    • Journal of the Korean Data and Information Science Society
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    • v.21 no.6
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    • pp.1101-1108
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    • 2010
  • This study was conducted to investigate whether whole body cryotherapy and spinal decompression have effectiveness on the pain, lumbar flexion range of motion, and global perceived effect scale in patients with lumbar disc herniation. Thirty subjects were participated in this study. And they were all randomly divided into whole body cryotherapy and spinal decompression group. To evaluate the effects of whole body cryotherapy and spinal decompression, subjects were evaluated by using visual analogue scale, lumbar flexion range of motion, and global perceived effect scale. The assessment parameters were evaluated before, after 2 weeks treatments. And we received a consent form whole body cryotherapy subjects. The results of paired t-test, independent t-test, and ANCOVA analysis of variance showed that pain, lumbar flexion range of motion, global perceived effect scale were significantly improved after than before therapy in whole body cryotherapy group. So we conclude that whole body cryotherapy has effectiveness on the pain, lumbar flexion range of motion, and global perceived effect scale in patients with lumbar disc herniation.

Whole Brain Radiation-Induced Cognitive Impairment: Pathophysiological Mechanisms and Therapeutic Targets

  • Lee, Yong-Woo;Cho, Hyung-Joon;Lee, Won-Hee;Sonntag, William E.
    • Biomolecules & Therapeutics
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    • v.20 no.4
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    • pp.357-370
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    • 2012
  • Radiation therapy, the most commonly used for the treatment of brain tumors, has been shown to be of major significance in tumor control and survival rate of brain tumor patients. About 200,000 patients with brain tumor are treated with either partial large field or whole brain radiation every year in the United States. The use of radiation therapy for treatment of brain tumors, however, may lead to devastating functional deficits in brain several months to years after treatment. In particular, whole brain radiation therapy results in a significant reduction in learning and memory in brain tumor patients as long-term consequences of treatment. Although a number of in vitro and in vivo studies have demonstrated the pathogenesis of radiation-mediated brain injury, the cellular and molecular mechanisms by which radiation induces damage to normal tissue in brain remain largely unknown. Therefore, this review focuses on the pathophysiological mechanisms of whole brain radiation-induced cognitive impairment and the identification of novel therapeutic targets. Specifically, we review the current knowledge about the effects of whole brain radiation on pro-oxidative and pro-inflammatory pathways, matrix metalloproteinases (MMPs)/tissue inhibitors of metalloproteinases (TIMPs) system and extracellular matrix (ECM), and physiological angiogenesis in brain. These studies may provide a foundation for defining a new cellular and molecular basis related to the etiology of cognitive impairment that occurs among patients in response to whole brain radiation therapy. It may also lead to new opportunities for therapeutic interventions for brain tumor patients who are undergoing whole brain radiation therapy.

Quality Characteristics and Physiological Activities of Takju with Whole Chestnut (통밤을 첨가한 탁주의 품질특성 및 생리활성)

  • Son, Jong-Youn;Jung, Il-Jin
    • Korean journal of food and cookery science
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    • v.30 no.6
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    • pp.746-756
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    • 2014
  • This study investigated the quality characteristics and physiological activities of takju prepared with whole chestnut (15%, 30% and 50% with steamed rice) during fermentation. The pH level began to decrease after the secondary brewing stage. The total acid as well as the organic acid content increased during fermentation. Lactic acid and succinic acid were the main organic acids in takju fermented with whole chestnut. The level of total sugar and reducing sugars in takju fermented with whole chestnut increased at the first brewing stage and then slowly decreased after 4 days of fermentation. Also, the total number of viable cells and microbial populations such as lactic acid bacteria and yeast in the treatments increased to about 108 CFU/mL after 1 days of fermentation and then decreased gradually afterward. The ethanol content in takju fermented with whole chestnut rapidly increased during the initial 4 days of fermentation, to a maximum content of 18.2% after 8 days. The colour values of the treatments did not show any significant differences between 0% and 15% chestnut content. However L value decreased, while the a and b values increased when the whole chestnut content above 30%. The total polyphenol level, electron donating ability, nitrite-scavenging ability and ferrous ion effect also increased as the ratio of whole chestnut increased. Sensory scores of takju fermented with 15% chestnut were greater than those of takju prepared by other treatments.

Determination of counting efficiency considering the biodistribution of 131I activity in the whole-body counting measurement

  • MinSeok Park ;Jaeryong Yoo;Minho Kim ;Won Il Jang ;Sunhoo Park
    • Nuclear Engineering and Technology
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    • v.55 no.1
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    • pp.295-303
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    • 2023
  • Whole-body counters are widely used to assess internal contamination after a nuclear accident. However, it is difficult to determine radioiodine activity due to limitations in conventional calibration phantoms. Inhaled or ingested radioiodine is heterogeneously distributed in the human body, necessitating time-dependent biodistribution for the assessment of the internal contamination caused by the radioiodine intake. This study aims at calculating counting efficiencies considering the biodistribution of 131I in whole-body counting measurement. Monte Carlo simulations with computational human phantoms were performed to calculate the whole-body counting efficiency for a realistic radioiodine distribution after its intake. The biodistributions of 131I for different age groups were computed based on biokinetic models and applied to age- and gender-specific computational phantoms to estimate counting efficiency. After calculating the whole-body counting efficiencies, the efficiency correction factors were derived as the ratio of the counting efficiencies obtained by considering a heterogeneous biodistribution of 131I over time to those obtained using the BOMAB phantom assuming a homogeneous distribution. Based on the correction factors, the internal contamination caused by 131I can be assessed using whole-body counters. These correction factors can minimize the influence of the biodistribution of 131I in whole-body counting measurement and improve the accuracy of internal dose assessment.

Toxicogenomics -A phenotype-independent approach-

  • Kanno, Jun
    • Proceedings of the Korean Society of Toxicology Conference
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    • 2003.10b
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    • pp.29-30
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    • 2003
  • The whole genome sequences, mapped for humans and rodents, and technical capability of monitoring whole genome expression in a high throughput fashion enable us to perform the "whole genome profiling". The major characteristics of this profiling from the toxicological point of view are that the overt phenotypes are not the essential factors for the construction of toxicity database/informatics.(omitted)

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A study on the determination of lead in whole blood by ICP/MS (ICP/MS에 의한 전혈 중 납의 분석방법 연구)

  • Park, Kyung Su;Kim, Sun Tae
    • Analytical Science and Technology
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    • v.10 no.4
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    • pp.240-245
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    • 1997
  • An accurate analysis method for the determination of lead in whole blood by ICP/MS was developed. Whole blood samples were decomposed in microwave digestion system without any contamination and loss of lead. The 96 samples were analyzed by ICP/MS using mass$^{208}$ isotope of lead. Lead concentrations of human whole blood were ranged of $2.50{\sim}22.8{\mu}g/dL$. The accuracy of this analysis method was verified by analyzing of NIST SRM 955a series(lead in blood).

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Comparative Studies on the Acute Toxicities of Whole Solids and Solids Aqueous Extracts Based on the Inhibition of Bacterial Bioluminescence Production

  • Kong, In-Chul
    • Environmental Engineering Research
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    • v.16 no.1
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    • pp.41-45
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    • 2011
  • The aim of this investigation was to demonstrate a rapid bioluminescence bioassay for comparison of the toxicity of whole solids and the aqueous extracts of various environmental solid samples. With regard to the toxicities, those for the soil extracts were mostly found to be lower than those of whole soils, which may have been caused by un-extracted pollutants or dilution during the extraction process. Solid samples from dam-reservoir sediments and municipal refuses were also tested. The toxicities of the solid extracts (0-34%; refuses and sediments) were much lower than those of the whole solids (13-91%). The bioluminescence inhibition test indicated that the harmful effects of the contaminated solids samples were greater than those of the solid extracts.