Kim, Byoung Ju;Oh, Seung Hwan;Cho, Eun Jin;Park, Seung Kyu
Tuberculosis and Respiratory Diseases
/
v.60
no.2
/
pp.171-179
/
2006
Background : Despite the emerging danger of MDR-TB to human beings, there have only been a limited number of drugs developed to treat MDR-TB since 1970. This study investigated the cross-resistance rate between rifampicin (RFP) and rifabutin (RBU) in order to determine the efficacy of rifabutin in treating MDR-TB. In addition, the results of rifabutin were correlated with the rpoB mutations, which are believed to be markers for MDR-TB and RFP resistance. Methods : The MICs of RBU were tested against 126 clinical isolates of MDR-TB submitted to the clinical laboratory of National Masan TB Hospital in 2004. Five different concentrations ($10-160{\mu}g/ml$) were used for the MICs. The detection of the rpoB mutations was performed using a RFP resistance detection kit with a line probe assay(LiPA), which contains the oligonucleotide probes for 5 wide type and 3 specific mutations (513CCA, 516GTC, and 531TTG) The rpoB mutation was determined by direct sequencing. Results : The rate of cross-resistance between RFP and RBU was 70.5%(74/105) at $20{\mu}g/ml$ RBU(ed note: How much RFP?) Most mutations (86.3%) occurred in the 524~534 codons. The His526Gln, His526Leu, Leu533Pro, Gln513Glu, and Leu511Pro mutations(Ed note: Is this correct?) were associated with the susceptibilty to RBU. Conclusion : Based on the cross-resistance rate between RFP and RBU, RBU may be used effectively in some MDR-TB patients. Therefore, a conventional drug susceptibility test for RBU and a determination of the critical concentration are needed. However, rpoB gene mutation test may be have limited clinical applications in detecting RBU resistance.
Plant disease caused by root-knot nematode is a major problem in crop production. Using of chemical pesticides, one of the most efficient methods to control nematodes, have raised issues in toxicity to humans and animals and environmental pollution. In this study, to select actinomycete strains that have potential to serve as a microbial agent for control of nematodes, we investigated nematicidal activity of culture broth from 670 Streptomyces isolates. A culture filtrate of KRA15-528 isolate that was identified as S. flavogriseus on the basis of 16S rRNA sequence analysis, showed strong nematicidal activity against second stage of juveniles of Meloidogyne incognita and inhibited egg hatching; exposure to 10% of culture filtrate resulted in 71% juvenile mortality at 48 hours afters treatment and suppressed egg hatching by 54% at 9 days after treatment. When the KRA15-528 culture filtrate was partitioned with ethyl acetate and butanol, ethyl acetate layer exclusively showed strong activity; 91%, 53%, 30% of mortality at 1,000, 500, $250{\mu}g/ml$, respectively. Additionally, the culture filtrate suppressed gall formation on cucumber plant by M. incognita with no phytotoxicity. These results suggest that S. flavogriseus KRA15-528 has potential to serve as a microbial nematicide for the control of root-knot nematode disease.
This study was performed to determine the estrous cycles by macroscopic observation of the ovarian changes using the laparoscopy and to make use of these results for embryo transfer in Korean black goat (Copra hircus aegagrus). Laparoscopic examinations of the ovaries were performed from 2 days after $CIDR^(R)$ removal to 22 days after ovulation. The serial morphological changes of follicles and corpus luteum (CL) were observed. CL was classified corpus hemorrhagicum(CH), corpus luteum (CL) and corpus albicans (CA) by its maturation and regression. On the day before ovulation (Day 0), Graafian follicles (GF) were found on one or both ovaries. On the day (Day 1) and $2^{nd}$day (Day 2) of ovulation, and ovulation depression (OD) and an early stage corpus hemorrhagicum $(CH_1)$ were observed at the site of GF, respectively. On Days 3 to 4, more developed and enlarged corpus hemorrhagicum $(CH_2\;and\;CH_3)$ arised from the ovulation of the GF with well vascularization. On Days 5 to 6, it was identified that mature corpus luteum $(CL_3)$ was grown on the ovary, and fully developed CL with adjacent follicles were occupied most part of the ovary on Days 17 and 18. Then the size of CL was diminished, and completely luteal regression $(CL_1\;or\;CA)$ with new large follicle was identified on Days 20 and 22. From these results, the 4 stages of the estrous cycle in Korean black goats were 1) estrus (Day 0) for 1 day, 2) metestrus $(Day\;1{\sim}4)$ for 4 days (stage of CH development), 3) diestrus $(Day\;5{\sim}16/17)$ for 12 or 13 days (luteal stage), and 4) proestrus $(Day\;17/18{\sim}20/22)$ for 4 or 5 days (stage of luteal regression and follicular growing). Laparoscopy for observation of ovarian changes was invasive than laparotomy. Additionally, it had advantages of reduced adhesion and quick operation time. It was considered that laparoscopic examination of ovarian changes will be useful for embryo transfer in the Korean black goats.
Journal of The Korean Society of Grassland and Forage Science
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v.6
no.1
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pp.38-43
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1986
This field experiment was conducted to determine the effects of shading degrees (0 : full sunlight, 25, 50 and 75%) on the early growth characteristics and winter survival of grasses. For the test different artificial shading houses were established and pasture species used were orchardgrass, timothy and perennial ryegrass. The experiment was performed at Livestock Experiment Station in Suweon, and sowing date was Aug. 25, 1984. The results are summarized as follows : 1. Generally, root length, new root length, number of new root and tillers of grasses were increased at 0% (full sunlight) of shading, followed by 25, 50 and 75% of shading degrees, in that order. Plant length and leaf elongation, however were increased at 50% of shading, followed by 75, 25 and 0%. 2. The percentage of winter killing of grasses was significantly (P<0.05) increased as the shading degrees increased. Also the percentages of winter killing were 10.1% in orchardgrass, 9.5% in timothy and 14.2% in perennial ryegrass, respectively. 3. A significant negative correlations were observed in the relationship between winter killing and tillers, new root length and number of new root of grasses. However, there were positive correlations between winter killing and plant length or leaf elongation under shading conditions. 4. As the shading degrees are increased by 0, 25, 50 and 75%, the NAR of grasses was tended to be decrease to 10.98, 11.52, 9.81 and 6.12 g/$m^2$/day, in that order. Also there was a negative correlation (r=-0.5943*) between winter killing and NAR of grasses, and NAR of orchardgrass, timothy and perennial ryegrass were 8.58, 8.53 and 11.71 g/$m^2$/day, respectively.
A series of performance measurements of positron emission tomography (PET) were performed following the recommendations of the Computer and Instrumentation Council of the Society of Nuclear Medicine and the National Electrical Manufacturers Association. We investigated the performance of the General Electric $Advance^{TM}$ PET. The measurements include the basic intrinsic tests of spatial resolution, scatter fraction, sensitivity, and count rate losses and randoms. They also include the tests of the accuracy of corrections: count rate linearity correction, uniformity correction, scatter correction and attenuation correction. GE $Advance^{TM}$ PET has bismuth germanate oxide crystals (4.0mm transaxial ${\times}$ 8.1mm axial ${\times}$ 30.0mm radial) in 18 rings, which form 35 imaging planes spaced by 4.25mm. The system has retractable tungsten septa 1mm thick and 12cm long. Transaxial resolution was 4.92mm FWHM in 2D and 5.14mm FWHM in 3D at the center. Average axial resolution in 2D decreased from 3.91mm FWHM at the center to 6.49mm FWHM at R=20cm. Average scatter fraction of direct and cross slices was 9.57%. Dead-time losses of 50% corresponded to a radioactivity concentration of $4.86{\mu}Ci/cc$ and a true count rate of 519 kcps in 2D. The accuracy of count rate linearity correction was 1.84% at the activity of $4.50{\mu}Ci/cc$. Non-uniformity was 2.06% in 2D and 2.93% in 3D. Remnant errors after scatter correction were 0.55% in 2D and 4.12% in 3D. The errors of attenuation correction were 6.21% (air), 0.20% (water), -6.32% (teflon) in 2D and 5.00% (air), 6.94% (water), 3.01% (teflon) in 3D. The results indicate the performance of GE $Advance^{TM}$ PET scanner to be well suited for clinical and research applications.
Cho S. R.;Choi S. H.;Kim H. J.;Han M. H.;Choe C. Y.;Chung Y. G.;Son D. S.
Journal of Embryo Transfer
/
v.20
no.2
/
pp.169-176
/
2005
Loop-mediated isothermal amplification (LAMP) is novel DNA amplification methods that amplifies a target sequence specifically under isothemal condition. The present study was to assess the in vitro viability afier biopsy and sexing rate of different types of embryo biopsied. In vivo compact morulae and blastocyst embryos were obtained from Korean Native Cow (KNC) superovulated with FSH (Antorin, R-10) on 7 Day after artificial insemination. in vitro compact morulae and blastocyst embryos were obtained with KNC or Holsteins that were gained on 6, 7 or 8 day after in vitro fertilization(IVF) with frozen semen. Biopsy of bovine embryo was carried out in a $80{\mu}l$ drop with $Ca^{2+}-Mg^{2+}$ free D-PBS and the viability of biopsied embryos were evaluated in IVMD (IFP, Japan) medium at 12 hrs culture time. The sex ratio of biopsied Hanwoo embryos were male vs. female of $43.5\%\;vs.\;56.5\%$ in vivo and $33.9\%\;vs.\;49.2\%$ in vitro respectively, and male rate of biopsied Holstein embryos were significantly higher than female $(70.8\;vs.\;29.2\%)$. and indefinite rate of in vitro embryos was $16.9\%$ and in vivo was not. The degeneration rate of biopsied embryo, in vitro embryos were significantly higher than in vivo $(13.2\%\;vs,\;0.0\%,\;p<0.05)$. The survivability of in vivo embryo were between biopsied following punching method was significantly (P<0.05) higher than bisection method produced embryos $(100\%\;vs.\;83.3\%)$ and in vitro had no difference. However, the degeneration rate of biopsied embryo by bisection method was significantly higher than punching methods between in vivo and in vitro $(16.7\;vs.\;22.6\%,\;respectively,\;p<0.05)$. In conclusion, these results indicate that punching method was optimal and survivability after embryo biopsy was useful for reducing the damage caused by the embryo biopsy procedure for LAMP-based embryo sexing.
Choi S. H.;Ryu I. S.;Son D. S.;Cho S. R.;Han M. H.;Kim H. J.;Choe C. Y.;Kim Y. K.
Journal of Embryo Transfer
/
v.20
no.2
/
pp.185-190
/
2005
This study was performed to investigate the effects of multiple superovulation and parity on embryo production in Hanwoo cows. Donors were superovulate 4 times $1\~2$ months interval and inserted CIDR plus (with the capsule of estradiol benzoate 10mg) on Day 10 from standing heat for 9 days and injected 2.5ml FSH (Antorin R-10) 2 times in a day on 6th day to 10th day from insertion of CIDR and the doses of FSH were decreasing 0.5ml on every 2 times. On 3th day of FSH injection, 25ml $PGF_2{\alpha}$ were injected i.m. and on 4th day, CIDR was removed. After 2 days from removing CIDR, AI was performed 2 times 12 hour apart with 2 straws of Korean Proved frozen Semen and simultaneously 200ug/ml GnRH was injected and embryos were recovered on 7th day from Al. The response rates of superovulated donors were $85.7\%,\;90.5\%,\;62.5\%,\;100\%$ from 1 to 4 times of superovulation, respectively. There were significant differences among No. of superovulation times (P<0.05). The results of transferable embryos were 3.7, 3.4, 3.4, 5.7 from 1 to 4 times of superovualtion, respectively. There were no differences among No. of superovulation times. The results of transferable embryos were 2.5, 3.0, 5.3, 3.0, 3.4 form heifer, first born to 4 the born, respectively. There were significant differences among the parities of donors (P<0.05). These results suggested that even 4 times of superovulations of Hanwoo donors could be able to recover transferable embryos, it might be used the donors maximally and improved the adaptation of embryo transfer to farms safely.
Stability of the braced earth wall in the composite ground, which is composed of the jointed base rocks and the soil strata depends on the earth pressure acting on it. In most cases, the earth pressure is calculated by the empirical method, in which base rocks are considered as a soil strata with the shear strength parameters of base rocks. In this case the effect of the joint dips of the jointed base rocks is ignored. Therefore, the calculated earth pressure is smaller than the actual earth pressure. In this study, the magnitude and the distribution of the earth pressure acting on the braced wall in the composite ground depending on the joint dips of the base rocks and the ratio of soil strata and base rocks were experimentally studied. Two dimensional large-scale model tests were conducted in a large scale test facility (height 3.0 m, length 3.0 m and width 0.5 m) by installing 10 supports in a scale of 1/14.5. The test ground was presumed with the base rock ratio of the composite ground of 65%:35% and 50%:50% and with the joint dips for each base rock layer, $0^{\circ}$, $30^{\circ}$, $45^{\circ}$ and $60^{\circ}$, respectively. And then finite element analyses were performed in the same condition. As results, the earth pressure on the braced wall increased as the base rock layer's joint dips became larger. And earth pressure at the rock layer increased as the rock rate became larger. The largest earth pressure was measured when the base rock rate was 50% (R50) and the rock layer's joint dips was $60^{\circ}$. Based on these results, a formular for the calculation of the earth pressure in the composite ground could be suggested. Distribution of earth pressure was idealized in a quadrangular form, in which the magnitude and the position of peak earth pressure depended on the rock ratio and the joint dips.
Journal of the Korean Society of Food Science and Nutrition
/
v.44
no.11
/
pp.1700-1707
/
2015
The effects of drying temperature on drying characteristics of soybeans with different grain sizes [6.0 (S), 7.5 (M), and 9.0 mm (L) (${\pm}0.2$)] with 25.0% (${\pm}0.8$) initial moisture content were studied. Drying temperatures varied at 25, 35, and $45^{\circ}C$, with a constant air velocity (13.2 m/s). Thin-layer drying models were applied to describe the drying process of soybeans. The Midilli-Kucuk model showed the best fit ($R^2$ >0.99). Based on the model parameters, drying time to achieve the target moisture content (10%) was successfully estimated. Drying time was strongly dependent on the size of soybeans and the drying temperature. The effective moisture diffusivity ($D_{eff}$) was estimated by the diffusion model based on Fick's second law. $D_{eff}$ values increased as grain size and drying temperature increased due to the combined effect of high temperatures and high drying rates, which promote compact tissue. Deff values of S, M, and L estimated were in the range of $0.83{\times}10^{-10}$ to $1.51{\times}10^{-10}m^2/s$, $1.17{\times}10^{-10}$ to $2.17{\times}10^{-10}m^2/s$, and $1.53{\times}10^{-10}$ to $2.95{\times}10^{-10}m^2/s$, respectively, whereas activation energy ($E_a$) based on drying temperature showed no significant differences in the size of soybeans.
Phytophagous insects associated with Dicotyledoneae weeds and host specificities in the field populations were investigated for the survey of biological control agents of weeds in Korea. Fifty four weed species in 39 genera were collected during the survey. The most insects were collected from Polygonales by 24 species in 22 genera and followed by Urticales and Centrospermales by 17 species of 17 genera. The insects collected in the other weed orders were ranged from 1 to 12 species. Out of 17 insect species collected in Urticales, Baris sp. damaged the leaves of Hamulus japonicus in Cannabinaceae as scattered holeshape and showed host specificity. In Polygonaceae, Rumex japonicus and R. crispus were severely damaged by Aphis rumicis and Gastrophysa atrocyanea. G. atrocyanea leaf beetle had host specificity on R. japonicus and ate all the leaves except veins. The leaf beetle, Lypesthes japonicus was a potential biological control agent by feeding leaves of Persicaria spp .. And Lixus spp. were also often collected from Persicaria spp .. Liothrips vaneeckei was first collected from weed, P. modosa. P. senticosa was damaged by unidentified geometrid moth larvae and P. perfoiliata by Miarus atricolor snout beetle. Cassida piperata damaged leaves of Chenopodium album of Centrospermales and showed host specificity. In a soybean field, C. album and Amaranthus mangostanus were severely damaged by Spodoptera litura larvae which were eating soybean leaves. This phenomenon indicates that the presence of weed in cultivated land influences the outbreak of insect pests. Altica oleracea leaf beetle was frequently collected from Oenothera spp. of Onagraceae in Myrtales. Aphis gossyphi was outbroken on Solanum nigrum and Phylliodes brettinghami leaf beetle was first recorded on the same plant. Leaf beetles, Longitarsus scutellais and Hemipyxis plagioderoides were first collected from Plantago asiatica of Plantaginaceae in Plantaginales. They showed host specificities in the fields. The hemipterans were collected from many weeds during the survey and their roles on weeds should be investigated. A tractomorpha bedeli was also collected from many kinds of weeds in forest areas.
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