Background: Currently, the cardiopulmonary machine with non-pulsatile pumps, which are low in internal circuit pressure and cause little damage to blood cells, is widely used. However, a great number of experimental studies shows that pulsatile perfusions are more useful than non-pulsatile counterparts in many areas, such as homodynamic, metabolism, organ functions, and micro-circulation. Yet, many concerns relating to pulsatile cardiopulmonary machines, such as high internal circuit pressure and blood cell damage, have long hindered the development of pulsatile cardiopulmonary machines. Against this backdrop, this study focuses on the safety and effectiveness of the pulsatile cardiopulmonary machines developed by a domestic research lab. Material and Method: The dual-pulsatile cardiopulmonary bypass experiment with total extracorporeal circulation was conducted on six calves, Extracorporeal circulation was provided between superior/inferior vena cava and aorta. The membrane oxygenator, which was placed between the left and right pumps, was used for blood oxygenation. Circulation took four hours. Arterial blood gas analysis and blood tests were also conducted. Plasma hemoglobin levels were calculated, while pulse pressure and internal circuit pressure were carefully observed. Measurement was taken five times; once before the operation of the cardiopulmonary bypass, and after its operation it was taken every hour for four hours. Result: Through the arterial blood gas analysis, PCO2 and pH remained within normal levels. PO2 in arterial blood showed enough oxygenation of over 100 mmHg. The level of plasma hemoglobin, which had total cardiopulmonary circulation, steadily increased to 15.87 $\pm$ 5.63 after four hours passed, but remained below 20 mg/㎗. There was no obvious abnormal findings in blood test. Systolic blood pressure which was at 97.5$\pm$5.7 mmHg during the pre-circulation contraction period, was maintained over 100 mmHg as time passed. Moreover, diastolic blood pressure was 72.2 $\pm$ 7.7 mmHg during the expansion period and well kept at the appropriate level with time passing by. Average blood pressure which was 83$\pm$9.2 mmHg before circulation, increased as time passed, while pump flow was maintained over 3.3 L/min. Blood pressure fluctuation during total extracorporeal circulation showed a similar level of arterial blood pressure of pre-circulation heart. Conclusion: In the experiment mentioned above, pulsatile cardiopulmonary machines using the doual-pulsatile structure provided effective pulsatile blood flow with little damage in blood cells, showing excellence in the aspects of hematology and hemodynamic. Therefore, it is expected that the pulsatile cardiopulmonary machine, if it becomes a standard cardiopulmonary machine in all heart operations, will provide stable blood flow to end-organs.
Exogeneous application of pokeweed antiviral protein (PAP), a ribosomal-inacivating protein in the cell wall of Phytolacca americana (pokeweed) protects heterologous plants from viral and fungal infection. A cDNA clone of PAP introduced into Scrophularia buergeriana Miquel by thransformation with Agrobacterium tumefaciences. For plant transformation, explants were precultured on shoot induction medium without kanamycin for 2-5 day, and then they were cocultured with Agrobacterium for 10 minutes. The explants were placed on co culture medium in dark condition, $28^{\circ}C$ for 2days. After explants were washed in MS liquid medium, they were transferred into selection medium including kanamycin 50mg/L (MS salts+1mg/ l BAP+2mg/ l TDZ+0,2mg/ l NAA+MS vitamin+3% sucrose+0.8% agar, pH5.8). From PCR analysis, NPT II band was confirmed in transgenic plant genome and showed resistance against fungi in antifungal activity test. Micro assay to which protein extracted from transgenic line were added, revealed hyphae growth inhibition and no spore germination at high concentration. The characteristics of inhibited hyphae was represented transparent and thin. Expression of PAP in transgenic plants offers the possibility of developing resistance to viral and fungal infection.
The objective of this study was to determine effects of $\beta$-mercaptoethanol ($\beta$-ME) and cyst-eine (CYS) on the development of bovine em-bryos obtained from in vitro matured and fertil-ized oocytes. Cumulus-oocyte-complexes (COC-s) were matured in micro-drop of TCM-199 medium containing 10% FBS, 17$\beta$-Estradiol and FSH-p under paraffin oil at 39$^{\circ}C$ for 24 hrs. The fertilization of COC were induced in Fert-TALP medium supplemented with PHE, heparin, BSA and then the fertilized oocytes were cultured in CR1aa medium for 24 hrs. To investigate the effects of the agents on the development of the embryos, the embryos developed to the late 2-cell stage were cultured in the media with and without $\beta$-ME, CYS for 9 days. In experiment 1, to select appropriate concentration of $\beta$-ME and CYS during whole culture period (9 days), various concentrations of $\beta$-ME and CYS were add ded to the CR1aa medium. Addition of 25TEX>$\mu$M of $\beta$-ME and O.1mM of CYS to the culture medium 1 increase the incidence of embryos developed to the blastocyst. In experiment 2, we evaluated the effects of 25$\mu$M of $\beta$-ME and O.1mM of CYS addition on the blastocyst formation when emb bryos at different stages were exposed to 25$\mu$M $\beta$-ME and O.1mM of CYS. $\beta$-ME and CYS enhanced in vitro development of embryos to the blastocyst stage. The effect was greater in 8-ceII to morula embryos than in embryos fewer than 2-cells at the initiation of treatment. These results suggested that the addition of 25$\mu$M B-ME and O.1mM cysteine enhanced development to the blastocyst and hatching stage of in vitro derived bovine embryos, also addition of $\beta$-ME and cysteine were effective later stage embryo than early embryo development.
A study on the application of impedance phase angle for redox titration, acid-base titration, chelate titration and precipitation titration has been carried out. A constant alternating current was passed between two platinum electrodes. One of them was a polarizable micro-electrode of $0.1cm^2$ or $0.026cm^2$ surface area and the other a non-polarizable large electrode of $1cm^2$ surface area dipped in the solution to be titrated. The impedance and the phase angle of the titration cell were measured with lock-in amplifier to obtain well behaved titration curve respectively. In titration of oxalic acid vs. potassium permanganate, the end-point was obtained successfully from the phase angle titration curve. In this experiment, the concentration of 0.0005 M to 0.05 M, the current of $50{\mu}A$ and the frequency of near 50 Hz were used. In titration of phosphoric acid vs. sodium hydroxide, the first end-point was obtained successfully on the optimum experimental condition of 0.001 M concentration, $50{\mu}A$ current and 25~97 Hz frequency. However, the end-point in titration of cupric sulfate vs. disodium-EDTA couldn't be obtained clearly. The end-point was obtained with the out-of-phase impedance curve on the experimental condition of 0.01 M concentration, $100{\mu}A$ current, 5~35 Hz frequency range. In titration of sodium chloride vs. silver nitrate, the end-point was obtained successfully on the experimental condition of 0.1 M concentration, $100{\mu}A$ current and 5~47 Hz frequency range. This study showed that the impedance phase angle was applicable for the detection of the end-points in redox titration curve, acid-base titration curve, chelate titration curve and precipitation titration curve.
limiting nutrients for phytoplankton were determined by dissored inorganic nitrogen/phosphorous (DIN/DIP) in situ and algal bioassay experiment in the Seomjin River estuary during a study period from March 1999 to October 2001. DIN/DIP ranged from 14.7 to 681.1 during the study period. DIN/DIP was over 16 at the upper and middle estuarine region where salinity was lower than 25 psu and chlorophyll a concentration was high, probably indicating P-limitation in this region while the ratio was less than 16 at the high saline (> 25 psu) region, reflecting the supply of DIP from Gwangyang Bay and thereby indicating N-limitation at the lower estuarine region. These results suggested that the spatial distribution of DIN/DIP in the study region was controlled by the high supply of phosphate from Gwangyang Bay, the low input from Seomjin River and the active uptake by phytoplankton within the estuarine system. The bioassay experiments using Skeletonema costatum, Thalaasiosira rotula and in situ phytoplankton assemblage displayed relatively higher growth of phytoplankton in the P-added culture media, indicating P-limitation. This result was well consistent with the spatial distribution of inorganic nutrients. S. costatum showed a rapid adaptation to the low salinity compared to other phytoplankton species. This phenomenon seemed to account for the strong (> $90\%$ in total cell number) S. costatum bloom in autumn in this estuary. Moreover, although phytoplankton growth rate was higher in the P-added culture media at the end of culture experiment of in situ phytoplankton, the fast growth in the trace metal-added media at the beginning of the experiment suggested a possibility of limitation by other micro-nutrients such as trace metal and vitamin etc.
The antimicrobial activities of $Smilax$$china$ L. against spoilage bacteria isolated from $Mang-gae$ rice cake were investigated and the storage stability of the $Mang-gae$ rice cake was enhanced. Spoilage bacteria, which cause $Mang-gae$ rice cake to rot, were isolated from commercial $Mang-gae$ rice cake, and most of the isolated strains were identified as $Bacillus$ sp. After the leaves, roots, shoots, and stalks of the $Smilax$$china$ L. were extracted using 50% ethanol as the solvent, their antimicrobial activities were investigated using the paper disc method by treating them with 50 ${\mu}L$ of $Bacillus$$cereus$, which is known as a major pathogenic micro-organism in foods that contain starch, as the test organism. The antimicrobial activities of the extracts were compared according to the size of the clear zones around the paper discs. The root extract showed significant antimicrobial activities. When red beans, which are used as stuffing for $Mang-gae$ rice cake, were treated with the root extract of the $Smilax$$china$ L., the viable cell count of the $Mang-gae$ rice cake was 5.04 Log CFU/g after 48-hr storage, and the cake showed significantly slower growth of bacteria than with commercial products. These results show that treatment of red beans with $Smilax$$china$ root extract could improve the storage stability of $Mang-gae$ rice cake.
Kim, Tae-Won;Lee, Geon-Hee;Jeon, Byeong-Gyun;Lee, Sung-Ho
Journal of Life Science
/
v.28
no.10
/
pp.1163-1169
/
2018
In order to utilize the residue that is thrown away after an onion harvest, we analyzed the physiological activity and cytotoxicity of fermented and hot water extracts of the residue. The pH of the extracts were all acidic, and organic matter content was 0.75% in the fermented extract and four times more than 0.19% in the hot water extract. The contents of nitrogen, phosphoric acid, calcium, and magnesium components, except for the potassium component among macroelements, were higher in the fermented extract than in the hot water extract. The content of iron and silicon among the micro-elements was also higher in the fermented extract than in the hot water extract. In addition, the content of boron was higher in the hot water extract than in the fermented extract. The total polyphenol contents of the fermented and hot water extracts were $16.2{\pm}3.3mg{\cdot}g^{-1}$ and $14.6{\pm}1.4mg{\cdot}g^{-1}$, respectively, which was $1.6mg{\cdot}g^{-1}$ higher in the fermented extract than in the hot water extract. However, the total flavonoid contents of the fermented and hot water extracts were $0.1{\pm}0.1mg{\cdot}g^{-1}$ and $4.8{\pm}0.7mg{\cdot}g^{-1}$, respectively, which was $4.7mg{\cdot}g^{-1}$ higher in the hot water extract than in the fermented extract. DPPH and ABTS radical scavenging ability for antioxidant activity were higher in the hot water extract than the fermented extract. The cytotoxicity of the extract using MTT assay showed cell viability of 101.6% and 97.9% in the fermented and hot water extracts, respectively. It was confirmed that there was no cytotoxicity in either extract.
PARK Young-Tae;PARK Ji-Bin;CHUNG Seong-Youn;Song Byung-Chul;LIM Wol-Ae;KIM Chang-Hoon;LEE Won-Jae
Korean Journal of Fisheries and Aquatic Sciences
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v.31
no.5
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pp.767-773
/
1998
In this study, we have investigated the distributions and killing effects of marine bacteria that tend to kill the red tide microalgae, C. polykikoides in the area of Masan bay from June to October, 1996. To summarize, C. polykikoides killing bacteria were detected at $10^2$ to $10^3$ cells/ml of seawater samples during the survey period, and the bloom was observed in September by containing $4.8\times10^3$cells/ml. It appears however that the number of these bacteria is decreased ($2.0\times10^2$cells/ml) in October, A total of 110 strains were isolated from seawater samples and seawater filtrate (pore size, 0.8 $\mu$m)-containing mixed culture of C. polykikoides in which the mixed culture was grown in f/2 medium. As results we have successfully isolated Micrococcus sp. LG-1 which decreased to less than 10cells/ml within 6days and 5days sfter inoculation of Micrococcus sp. LG-1 into the la9 and logarithmic growth phases of C. polykrikoides respectively. Therefore, it appears that inoculation of Micrococcus sp. LG-1 against the logarithmic C. polykrikoides is more effective than the lag growth phase, (n addition, the killing effects were increased in accordance with bacterial cell densities inoculated in a dose dependent manner. Especially, the filtrate of kitling bacterium culture (nore size, 0.2 $\mu$m) revealed a dramatic effect in which C. polykrikoides were decreased to less than 10 cells/mf of culture within 1 hr, 1,5 hrs, 1,5 hrs, 3.5 hrs. and 5,5 hrs after inoculations of the culture filtrate with concentration of $30\%,\;20\%,\;10\%,\;5\%$ and $2.5\%$, respectively. Moreover Micrococcus sp. LG-1 showed a selective specificity against C. polykrikoides and any other killing effects of Micrococcus sp. LG-1 were not observed against Alexandrium tamarense, Prorocentrum micans, Scrippsiella trochoidea. ana Gymnodinium sanguineum.
Journal of the Korean Society of Food Science and Nutrition
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v.30
no.6
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pp.1253-1259
/
2001
The purpose of this study was to investigate the effects of green tea catechin on change of bone tissue in long-term cadmium treated rats. Sprague-Dawley male rats weighing 100$\pm$10 g were randomly assigned to one normal group and three cadmium treated groups. Cadmium groups were classified to catechin free diet group (Cd-0C group), 0.25% catechin diet group (Cd-0.25C group) and 0.5% catechin diet group (Cd-0.5C group) according to the levels of catechin supplement. Animals were raised for 20 weeks. Cadmium were supplied as drinking water of 50 ppm Cd$^{2+}$. Effects of catechin were analyzed on changes of bony tissue in long-term cadmium treated rats by determining the accumulated cadmium in bone and bone mineral density and micro- photographs of bony tissue. The cadmium accumulation of tibia and femur were higher in Cd-treated groups than in normal group, but they was lowered by catechin supplementation. The bone mineral density (BMD) of tibia and femur in Cd-0C group was significantly lower than in normal group, but it of catechin supplemetation group was similar to normal group. Microphological changers were appeared under a light microscope and an electro microscope reveal no structural changes in bony spicules, marrow cell distribution and cellular morphology in all groups. The bone weight and length tend to decrease in Cd-0C groups. Catechin supplementation in long-term cadmium treated rats depressed the cadmium accumulation in bony tissue that led to improve the bone mineral density in tibia and femur.r.
Journal of the Institute of Electronics Engineers of Korea CI
/
v.47
no.5
/
pp.50-60
/
2010
For the last half a century, the personal computer and software industries have been prosperous due to the incessant evolution of computer systems. In the 21st century, the embedded system market has greatly increased as the market shifted to the mobile gadget field. While a lot of multimedia gadgets such as mobile phone, navigation system, PMP, etc. are pouring into the market, most industrial control systems still rely on 8-bit micro-controllers and simple application software techniques. Unfortunately, the technological barrier which requires additional investment and higher quality manpower to overcome, and the business risks which come from the uncertainty of the market growth and the competitiveness of the resulting products have prevented the companies in the industry from taking advantage of such fancy technologies. However, high performance, low-power and low-cost hardware and software platforms will enable their high-technology products to be developed and recognized by potential clients in the future. This paper presents such a platform for industrial embedded systems. The platform was designed based on Telechips TCC8300 multimedia processor which embedded a variety of parallel hardware for the implementation of multimedia functions. And open-source Embedded Linux, TinyX and GTK+ are used for implementation of GUI to minimize technology costs. In order to estimate the expected performance and power consumption, the performance improvement and the power consumption due to each of enabled hardware sub-systems including YUV2RGB frame converter are measured. An analytic model was devised to check the feasibility of a new application and trade off its performance and power consumption. The validity of the model has been confirmed by implementing a real target system. The cost can be further mitigated by using the hardware parts which are being used for mass production products mostly in the cell-phone market.
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