• Korean Journal of Plant Tissue Culture
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• v.25 no.2
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• pp.95-98
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• 1998

Hypocotyl explants of flowering cabbage were cocultured with Agrobacterium tumefaciens LBA4404;;pGA875 harboring proteinase inhibitor II(PI-II) cDNA and then regenerated into plants. Sucessful transcripts of PI-II gene were detected by RNA dot blot analysis. Bioassay was conducted on transgenic flowering cabbage. It was confirmed that insecticidal activities of transformants were much higer than that of control plants. In progeny test of hansformants, 27.4% of T$_1$ seeds was resistant on MS medium containing 20 mg/L kanamycin.

• Korean Journal of Veterinary Research
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• v.44 no.3
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• pp.433-439
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• 2004

This study was carried out to investigate the efficacy of rifampin with or without streptomycin in male Sprague-Dawley (SD) rats experimentally inoculated with Brucella abortus. Thirty rats were intraperitoneally inoculated with $1.0{\times}10^9$colony-forming units of B. abortus. They were divided into 3 groups by treatment with antibiotic. 10 rats in Group A were orally administrated with rifampin, 10 rats in Group B with rifampin orally and with streptomycin intramuscularly over 12 weeks starting at 1 week post infection (PI). A placebo recipient in Group C was inoculated with sterile saline without antibiotics. All animals were monitored by tube agglutination test (TAT) and AMOS-PCR to evaluate the efficiency of the antibiotics to B. abortus infection. The antibody titers in Groups A, B and C were 1:400, 1:400 and 1:800 as measured by TAT at the first week PI, respectively. The antibody titer in Group A decreased to 1:100 by the 13th week PI. That in the control group was observed as high antibody titer until 13th weeks PI, but the antibody response in Group B was low(1:50) from the 5th week to the 13th week PI. AMOS-PCR there was evidence of relapse of B. abortus in group A in liver and spleen specimens at the 13th week PI. B. abortus DNA was detected in Group C in liver and spleen specimens from the 1st week to 13th week PI by AMOS-PCR. However AMOS-PCR could not detect any organism in Group B from the 3rd week PI until the end of the study. This study demonstrated that administration of a combination of rifampin and streptomycin was more efficacious than administration of rifampin alone. A significant reduction in antibody titer was observed when a combination of 15 mg/kg/day of rifampin per os and 15 mg/kg/day streptomycin intramuscularly was used in comparison with the antibody of control group.

• Journal of the Korean Society of Food Science and Nutrition
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• v.43 no.12
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• pp.1827-1834
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• 2014

Colon cancer is the third highest cause of death in Korea. Known dietary causes of colon cancer include a diet rich in fat and red meat as well as inadequate intake of dietary fiber, fruits, and vegetables. Therefore, recent research has focused on the anticancer effects of natural products. Opuntia humifusa is a type of prickly pear that is known to contain biologically active compounds that can be used in the treatment of diabetes mellitus, arteriosclerosis, and hyperglycemia. The aim of this study was to determine whether or not O. humifusa extract affects proliferation, cell death, and DNA fragmentation in human carcinoma HT-29 cells. O. humifusa is rich in carbohydrates, minerals (Mg, K, and Ca), and total phenolics. HT-29 cells were treated with extracts of O. humifusa at concentrations of 0, 0.25, 0.5, 1, and 2 mg/mL for 24 or 48 hours. O. humifusa extracts inhibited HT-29 cell growth in a dose-dependent manner. Hoechst 33342/PI double staining and Comet assay were performed to observe changes in nuclei of cancer cells undergoing cell death. The results of both tests showed that O. humifusa extract induced cell shrinkage, DNA fragmentation, and chromatin condensation dose-dependently in HT-29 cells. The results of this study suggest that O. humifusa extract inhibits the growth of HT-29 via induction of DNA fragmentation and chromatin condensation.

• Korean Journal of Veterinary Service
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• v.15 no.2
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• pp.128-133
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• 1992

To obtain the basic data for blood chemistry, the effects of the time elapse of serum separation on bovine blood chemical values were investigated. The results obtained are summerized as follows : 1. The constant fluctuation tendency and significance was not detected in GOT, GPT, BUN, Creatinine, ALP, CPX, Cholesterol, Ca, Mg and Pi. 2. Glucose showed the decrease tendency according to the time elapse of serum separation. As the values at 12 and 24 hours showed significant lower values than those at 1 and 2 hours (p＜0.01) it was thougth that separation time of serum should be focussed for the glucose determination.

• The Korean Journal of Physiology and Pharmacology
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• v.3 no.5
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• pp.513-519
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• 1999

Direct exposure of renal tubular brush-border membranes (BBM) to free cadmium (Cd) causes a reduction in phosphate (Pi) transport capacity. Biochemical mechanism of this reduction was investigated in the present study. Renal proximal tubular brush-border membrane vesicles (BBMV) were isolated from rabbit kidney outer cortex by Mg precipitation method. Vesicles were exposed to $50{\sim}200\;{\mu}M\;CdCl_2$ for 30 min, then the phosphate transporter activity was determined. The range of Cd concentration employed in this study was comparable to that of the unbound Cd documented in renal cortical tissues of Cd-exposed animals at the time of onset of renal dysfunction. The rate of sodium-dependent phosphate transport $(Na^+-Pi\;cotransport)$ by BBMV was determined by $^{32}P-Iabeled$ inorganic phosphate uptake, and the number of $Na^+-Pi$ cotransporters in the BBM was assessed by Pi-protectable $^{14}C-labeled$ phosphonoformic acid $([^{14}C]PFA)$ binding. The exposure of BBMV to Cd decreased the $Na^+-Pi$ cotransport activity in proportion to the Cd concentration in the preincubation medium, but it showed no apparent effect on the Pi-protectable PFA binding. These results indicate that an interaction of renal BBM with free Cd induces a reduction in $Na^+-Pi$ cotransport activity without altering the carrier density in the membrane. This, in turn, suggest that the suppression of phosphate transport capacity $(V_{max})$ observed in Cd-treated renal BBM is due to a reduction in $Na^+-Pi$ translocation by existing carriers, possibly by Cd-induced fall in membrane fluidity.

• Bulletin of the Korean Chemical Society
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• v.34 no.2
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• pp.453-459
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• 2013

In phtosynthetic light harvesting complexes, the electronic transition energies of chlorophylls are influenced by the Coulombic interaction with nearby molecules. Variation of the interactions caused by structural inhomogeneity in biological environment results in a distribution of disordered electronic transition energies of chlorophylls. In order to provide a practical guide to predict qualitative tendency of such distribution, we model four porphyrin derivatives including chlorophyll a molecule interacting with an external positive charge and calculate their transition energies using the time dependent density functional method. It is found that ${\pi}-{\pi}^*$ transition energies of the molecules are generally blue-shifted by the charge because this stabilizes occupied molecular orbitals to a greater extent than unoccupied ones. Furthermore, new transitions in the visible region emerge as a result of the red-shift in energy of an unoccupied Mg orbital and it is suggested that light-induced electron transfer may occur from the tetrapyrrole ring to the central magnesium when the molecules are interacting with a positive charge.

• YAKHAK HOEJI
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• v.59 no.3
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• pp.85-91
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• 2015

Highly active antiretroviral therapy (HAART) has reduced AIDS-related morbidity and mortality; however, it has been associated with metabolic abnormalities including dyslipidemia and dysglycemia depending on the regimens used. The aims of this study were to analyze the prescription patterns of antiretroviral agents and to examine the prevalence of lipid abnormalities among the prescriptions of HAART. The electronic medical records (EMR) of HIV patients were retrospectively reviewed from January 2007 to September 2012 based on our inclusion criteria. The patients who had taken HAART for at least 3 months were included in this study. The lipid profiles of patients on antiretrovirals (ARTs) were collected from his or her laboratory data, and dyslipidemia was defined as total cholesterol (TC) ${\geq}240mg/dL$ and triglycerides (TG) >200 mg/dL. Eighty-four prescriptions were discovered during the study period. Twenty-three prescriptions were the combination of two nucleoside reverse transcriptase inhibitors (NRTIs) and one non-nucleoside reverse transcriptase inhibitor (NNRTI). Fifty-three prescriptions were the combination of two NRTIs and one protease inhibitor (PI) and thirty-nine prescriptions of them included a PI booster. Eight prescriptions were the combination of two NRTIs and one integrase inhibitor. The Incidence of hypertriglyceridemia among the patients receiving HAART was totally about 41.7% (2NRTIs+PI regimen vs. 2NRTIs+NNRTI regimen vs. 2 NRTIs+integrase inhibitor regimen, 52% vs. 12.5% vs. 25%), but there was no incidence of hypercholesterolemia. This study investigated that the prescription medication patterns and dyslipidemia associated with lipid abnormalities among HIV patients receiving HAART. The types of HAART prescription regimens had an effect on the occurrence of hypertriglycemia. Further studies related to metabolic abnormalities and adverse effects of HIV patients on ARTs are needed in the near future.

• Journal of Veterinary Clinics
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• v.33 no.6
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• pp.356-361
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• 2016

During storage, boar spermatozoa undergo several changes including diminished motility and viability and accumulated reactive oxygen species (ROS). In this study, we investigated the effects of green tea extract (GTE) supplementation in the Sui Dil extender on the sperm motility, viability, ROS and lipid peroxidation (LPO) of long-term preserved boar semen at $17^{\circ}C$. A total number of eight boars were used for this experiment. Pooled ejaculates were diluted to $20{\times}10^6sperm/ml$ in the Sui Dil extender containing 0 (control), 1, 10, 100 or 500 mg/l GTE and were preserved at $17^{\circ}C$ for 24, 72, 120 and 168 h, respectively. At each storage time, sperm motility and viability were estimated by microscopic examination and the fluorescent double stain $Fertilight^{(R)}$, respectively. Sperm ROS level and LPO were assessed using the 2', 7'-dichlorodihydrofluorescein diacetate ($H_2DCFDA$)/propidium iodide (PI) and C11-BODIPY581/591/PI with flow cytometry, respectively. Compared to that of the 500 mg group, there were higher sperm motility and viability in the 1, 10 and 100 mg GTE groups during the preservation from 24 to 168 h (p < 0.05). The ROS levels of the 10 and 100 mg groups during the 168 h preservation were lower than those of the 0, 1 and 500 mg groups (p < 0.05). There were no significant differences in LPO regardless of the preservation period or the GTE concentration. In conclusion, the optimal concentrations (10 and 100 mg/l) of GTE that led to lower ROS levels may be useful for liquid boar sperm preservation at $17^{\circ}C$ for a period of 168 h.

• Korean Journal of Soil Science and Fertilizer
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• v.49 no.5
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• pp.524-530
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• 2016

Agricultural soils near or around industrial complexes can contain a certain amount of heavy metals that readily enter the food chain and negatively affect human health. Therefore, we conducted the study to investigate the distribution of selected heavy metals, including arsenic (As), cadmium (Cd), chromium (Cr), nickel (Ni), lead (Pb), mercury (Hg), and zinc (Zn), in farm-land soils around fifteen industrial complexes in the southwestern provinces, Korea. The concentrations of heavy metals in the soil samples were determined by the pseudo-total aqua regia (3 HCl : $1HNO_3$) digestion procedure. The heavy metal concentrations in most soils examined did not exceed the levels of Soil Contamination Warning Standard (SCWS) for agricultural lands (Region 1) presented in Soil Environment Conservation Law (SECL) established by Ministry of Environment (MOE), Korea. However, only one sampling site showed higher As amount ($27.1mg\;kg^{-1}$) than the SCWS level of As ($25mg\;kg^{-1}$). Pollution index (PI) for heavy metals did not exceed 1.0. The PI values were significantly positively correlated (p < 0.01) with the heavy metal concentrations. In particular, the values of correlation coefficient between the Cd and Pb concentrations and the PI values were higher than those estimated from other combinations, and thus the amounts of Cd and Pb in the agricultural soils highly affected the PI values for the heavy metals.

• Journal of Korean Society of Forest Science
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• v.83 no.2
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• pp.164-174
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• 1994

Temporal changes in growth performances, chlorophyll contents, and tissue water relations for determining their physiological responses of five economic tree species subjected to chronic water and nutrition stresses were investigated with containerized seedlings grown in different soil moisture regimes and nutrition levels. Seedlings of Quercus acutissima, Q. variabilis, Q. mongolica, Q. serrata, and Fraxinus rhynchophylla were propagated in plastic pots(I.D. $16cm{\times}Depth$ 16cm) for the experiments. The seedlings were subjected to two soil moisture regimes of dry and wet soils and two nutrition levels of fertilization with N+P+K and no fertilization through the growing season from May to September in a green house. For the purpose of analyzing their responses to the environmental stresses, seedling heights and root collar diameters, chlorophyll contents, and P-V curve parameters of the seedlings were measured in May, July, and September. The environmental stresses coming from moisture and nutrient deficits affected the growth performances of seedlings variously among species and among different growing periods, as well as between height and basal diameter growth of seedlings. The growth performances of Q. acutissima were influenced sensitively on the stresses, but those of Q. mongolica less influenced in comparison with other species. Chlorophyll contents were generally higher in Quercus spp. than F. rhynchophylla through the growing season. The chlorophyll contents changed by species and by treatment through the season within ranges of 0.14~1.96 mg/g dry wt. of chlorophyll a and within 0.16~1.79mg/g dry wt. of chlorophyll b, respectively. But the contents seemed to be decreased gradually through the chronic environmental stresses and leaf senescence. The osmotic potential at full turgor(${\Psi}{{\pi}o}$) and turgor loss point(${\Psi}{\pi}p$) had temporarily declined up to 3 to 5bars from -7.0~-12.4bars in May to -10.2~-17.5bars in September and up to 5 to 6bars from -7.6~-14.2bars in May to -12.9~-20.4bars in September, respectively, with some exceptions. The values of ${\Psi}{\pi}p$ were generally high in F. rhynchophylla in May and July, but high in Q. serrata in September. Relative water contents at turgor loss point(RWCp) were generally high in F. rhynchophylla, but the temporal changes of RWCp were quite and frequently different among species and among treatment.