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( Jong Chan Chae ),( Nguyen Bao Hung ),( Sang Mi Yu ),( Ha Kyung Lee ),( Yong Hoon Lee ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.6
Bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae (Xoo) is a very serious disease in rice-growing regions of the world. In spite of their economic importance, there are no effective ways of protecting rice plants from this disease. Bacteriophages infecting Xoo affect the population dynamics of the pathogen and consequently the occurrence of the disease. In this study, we investigated the diversity, host range, and infectivity of Xoo phages, and their use as a bicontrol agent on BLB was tested. Among the 34 phages that were isolated from floodwater in paddy fields, 29 belonged to the Myoviridae family, which suggests that the dominant phage in the ecosystem was Myoviridae. The isolated phages were classified into two groups based on plaque size produced on the lawn of Xoo. In general, there was a negative relationship between plaque size and host range, and interestingly the phages having a narrow host range had low efficiency of infectivity. The deduced protein sequence analysis of htf genes indicated that the gene was not a determinant of host specificity. Although the difference in host range and infectivity depending on morphotype needs to be addressed, the results revealed deeper understanding of the interaction between the phages and Xoo strains in floodwater and damp soil environments. The phage mixtures reduced the occurrence of BLB when they were treated with skim milk. The results indicate that the Xoo phages could be used as an alternative control method to increase the control efficacy and reduce the use of agrochemicals.
산업폐수배출시설 업종별 수질오염물질 배출실태(4) -섬유제품, 염색, 정리 및 마무리 가공업과 펄프·종이 및 판지 제조업-
조항수 ( Hang Soo Cho ),노혜란 ( Hye Ran Noh ),황문영 ( Moon Young Hwang ),임종권 ( Jong Kwon Im ),김재훈 ( Jae Hoon Kim ),류덕희 ( Doug Hee Rhew ),유순주 ( Soon Ju Yu ),이재관 ( Jae Kwon Lee ) 한국물환경학회(구 한국수질보전학회) 2015 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2015 No.-
염종훈 ( Jong Hoon Yeom ),신우종 ( Woo Jong Shin ),김유정 ( Yu Jung Kim ),심재항 ( Jae Hang Shim ),전우재 ( Woo Jae Jeon ),조상윤 ( Sang Yun Cho ),김경헌 ( Kyoung Hun Kim ) 대한마취과학회 2009 Korean Journal of Anesthesiology Vol.56 No.5
Background: We hypothesized that pressure control ventilation allows a more even distribution in the lung and better maintenance of the mean airway pressure than is achieved with volume control ventilation. We try to compare the effect of pressure control ventilation (PC) with that of volume control ventilation without an end-inspiratory pause (VC) during one-lung ventilation (OLV) in an anesthetized, paralyzed patient for performing thoracopic bullectomy of the lung. Methods: We ventilated 20 patients with VC and PC after the insertion of a thoracoscope in continual order for, at least for 15 minutes, for each, VC and PC procedure. At the end of VC and PC, the respiratory mechanics, gasometrics, and hemodynamic parameters were measured and collected. Results: We found no significant differences between VC and PC except for the peak inspiratory airway pressure (PIP), the mean airway pressure and the arterial oxygen partial pressure (PaO2). The PIP was significantly decreased from 27.0±6.0 cmH2O (VC) to 21.8±5.4 cmH2O (PC). The mean airway pressure was significantly increased from 8.6±1.6 cmH2O (VC) to 9.4±2.0 cmH2O (PC), and the PaO2 was significantly increased from 252.9±97.3 mmHg (VC) to 285.2±103.8 mmHg (PC). Conclusions: If PC allows mechanical ventilation with the same tidal volume and respiratory rate as VC during OLV, then PC significantly increases the PaO2 but this is not clinically significant, and the PC significantly decreases the PIP, which induces barotrauma or volutrauma when the PIP is excessively high. (Korean J Anesthesiol 2009;56:492~6)
경기지역의 우결핵 발생에 관한 역학적 고찰(1987~1996)
우종태 ( Jong Tae Woo ),심항섭 ( Hang Sub Shim ),고태오 ( Tae Oh Ko ),국정희 ( Jung Hee Kook ),박유순 ( Yu Soon Park ),조중현 ( Jung Hyun Chi ) 한국가축위생학회 1998 韓國家畜衛生學會誌 Vol.21 No.1
As the result of epidemiological analysis on bovine tuberculosis in Kyonggi province during the last ten years(1987-1996), 1. The annual incidence number of bovine tuberculosis positive farms in Kyonggi province fell down from 81 in 1987 to 14 in 1989. But the incidence is increased since 1990, in 1995 the incidence number was 102 farms of the most incidence. Total number of bovine tuberculosis positive farms were 456 farms(56.7%) in Kyonggi province during the 1987-1996 period. 2. The developmental trends of bovine tuberculosis positive heads was similiar to that of positive farms. Since 1993, the incidence was suddenly increased. Total number of bovine tuberculosis positive heads were 1,015 head(64.3%) in Kyonggi province during the 10 years. 3. Average incidence for rate during the last ten years(1987-1996) was 0.10%. The positive rate was suddenly increased since 1993 and in 1996, the positive rate was 0.23% of the highest incidence. 4. Regional incidence number of bovine tuberculosis positive heads in Kyonggi province during the last seven years(1990-1996) was the most in Hwasung, Pochon, Pyungtek in order of incidence and bovine tuberculosis positive density was 1.297% of the highest in Buchon. 5. In 244 farms(82.4%), bovine tuberculosis first occurred during the last seven years (1990-1996) but in farms over second occurrence, the number of bovine tuberculosis positive heads were 520 heads(58.2%).
Ree, Jong-baik,Kim, Sung-Hee,Lee, Taeck-Hong,Kim, Yu-Hang Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.4
Intramolecular energy flow and C-$H_{methyl}$ and C-$H_{ring}$ bond dissociations in vibrationally excited toluene in the collision with HF have been studied by use of classical trajectory procedures. The energy lost by the vibrationally excited toluene upon collision is not large and it increases slowly with increasing total vibrational energy content between 20,000 and 45,000 $cm ^{-1}$. Above the energy content of 45,000 $cm ^{-1}$, however, energy loss decreases. Furthermore, in the highly excited toluene, toluene gains energy from incident HF. The temperature dependence of energy loss is negligible between 200 and 400 K. Energy transfer to or from the excited methyl C-H bond occurs in strong collisions with HF transferring relatively large amount of its translational energy (>> $k_BT$) in a single step, whereas energy transfer to the ring C-H bond occurs in a series of small steps. When the total energy content $E_T$ of toluene is sufficiently high, either C-H bond can dissociate. The C-$H_{methyl}$ dissociation probability is higher than the C-$H_{ring}$ dissociation probability. The dissociation of the ring C-H bond is not the result of the intermolecular energy flow from the direct collision between the ring C-H and HF but the intramolecular flow of energy from the methyl group to the ring C-H stretch. The C-$H_{ring}$${\cdot}{\cdot}{\cdot}$HF interaction is not important in transferring energy and in turn bond dissociation.
배재현,Jong Min Yu,Van Hung Dao,Vanno Lok,윤기봉 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.9
The selective laser melting (SLM) method is being increasingly applied in the aerospace and power industries for the production of high temperature critical components. The effects of SLM processing parameters, such as laser power, scanning speed, and energy density on the creep properties were investigated for 316L stainless steel (SS316L). The effect of building direction was also studied. The creep resistance was influenced by the manufacturing direction. The vertical specimen demonstrated a longer creep life and higher creep resistance than the horizontal specimen. The creep resistance remained constant when the energy density was kept constant during manufacturing. If insufficient energy density was used for manufacturing, internal defects, such as voids and unmelt powder were generated, and lowered the creep resistance. However, if sufficient energy density higher than a minimum value was employed, the material creep properties mainly depended on the level of the energy density.