http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
( Radhakrishnan ),( Ramalingam ),( Kang Bo Shim ),( Byeong Won Lee ),( Chung Dong Hwang ),( Suk Bok Pae ),( Chang Hwan Park ),( Sung Up Kim ),( Choon Ki Lee ),( In Youl Baek ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.6
Application of rhizospheric fungi is an effective and environmentally friendly method of improving plant growth and controlling many plant diseases. The current study was aimed to identify phytohormone-producing fungi from soil, to understand their roles in sesame plant growth, and to control Fusarium disease. Three predominant fungi (PNF1, PNF2, and PNF3) isolated from the rhizospheric soil of peanut plants were screened for their growth-promoting efficiency on sesame seedlings. Among these isolates, PNF2 significantly increased the shoot length and fresh weight of seedlings compared with controls. Analysis of the fungal culture filtrate showed a higher concentration of indole acetic acid in PNF2 than in the other isolates. PNF2 was identified as Penicillium sp. on the basis of phylogenetic analysis of ITS sequence similarity. The in vitro biocontrol activity of Penicillium sp. against Fusarium sp. was exhibited by a 49% inhibition of mycelial growth in a dual culture bioassay and by hyphal injuries as observed by scanning electron microscopy. In addition, greenhouse experiments revealed that Fusarium inhibited growth in sesame plants by damaging lipid membranes and reducing protein content. Co-cultivation with Penicillium sp. mitigated Fusarium-induced oxidative stress in sesame plants by limiting membrane lipid peroxidation, and by increasing the protein concentration, levels of antioxidants such as total polyphenols, and peroxidase and polyphenoloxidase activities. Thus, our findings suggest that Penicillium sp. is a potent plant growthpromoting fungus that has the ability to ameliorate damage caused by Fusarium infection in sesame cultivation.
Studies on toxic effects of nitrogenous compound, putrescine and spermine on cucumber plant growth
Radhakrishnan, R.,Shin, J.-H.,Choo, Y.-S.,Kim, J.-G.,Lee, I.-J. PRAGATI PRESS- INDIA 2014 Journal of environmental biology Vol.35 No.1
The present study was conducted to determine the effects of putrescine (Put) and spermine (Spm) on cucumber plant growth. The low concentration of Put and Spm (0.02, 0.1 and 0.5 mM) was applied to cucumber seedlings. Put and Spm treatments reduced the length and fresh weight of shoots, leaf area, fresh and dry weight of leaves compared to their controls. The enhancement of electrical conductivity and lipid peroxidation was shown in cucumber plants exposed with Put and Spm. However, plants treated with Put and Spm showed low concentration of polyphenol contents with declined level of catalase and peroxidase activity than their controls. These results suggest that application of low concentrations of Put and Spm exhibit detrimental effects on plant growth through the enhanced level of lipid peroxidation and reduction of antioxidants activities.
Radhakrishnan, Ramalingam,Pae, Suk-Bok,Kang, Sang-Mo,Lee, Byoung-Kyu,Lee, In-Jung,Baek, In-Youl The Korean Society for Applied Biological Chemistr 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.3
Peanut is grown primarily for human consumption due to their favorable nutrient profile and functional compound such as isoflavone in seeds. The aim of this study was to evaluate the amino acid, fatty acid, and isoflavone profile in seeds of seven peanut cultivars (Suwon 88, Daewon, Daekwang, Seonan, Saedeul, Satonoka, and Pungan) grown in Korea. The protein and oil contents in peanut seeds varied at the range of 21.4 to 32.0% and 41.7 to 47.2%, respectively. The quantity of protein was relatively similar in all peanut cultivars except Pungan seeds. The result of amino acid analysis showed that Suwon 88, Daewon, and Seonan seeds had higher concentration of amino acid (Asp, Thr, Ser, Glu, Pro, Gly, Ala, Cys, Val, Met, Ile, Leu, Tyr, Phe, His, Lys, and Arg) than other peanut cultivars. However, the quantity of oil was higher in Suwon 88, Daekwang, Seonan, and Satonoka seeds, whereas the fatty acid profile analysis revealed that higher levels of oleic acid, arachidic acid, gondoic acid, behenic acids, and lower levels of palmitic, stearic, and linoleic acids were found in Saedeul seeds. In addition, the isoflavones, daidzin, genistin, and daidzein were higher in Satonoka (97.96, 63.19, and $33.8{\mu}g/g$, respectively) followed by Daewon. The results of the present study suggest that the cross among identified peanut cultivars, Satonoka (high yielding isoflavones), Seadeul (high yielding oleic acid), Suwon 88, Daewon, and Seonan (high yielding amino acid) would improve the nutritional and functional compounds of breeding lines.
Effect of injection conditions on mixing performance of pintle injector for liquid rocket engines
Radhakrishnan, Kanmaniraja,Son, Min,Lee, Keonwoong,Koo, Jaye Elsevier 2018 Acta astronautica Vol.150 No.-
<P><B>Abstract</B></P> <P>A movable pintle injector provides an effective throttling and high combustion stability in liquid rocket engines for performing space maneuvers safely. It has a movable pintle rod that causes a variable injection area. The mass flow of simulant and pintle opening affect the mixing performance of propellants, which is concerned in this paper. Therefore, the mixing performance is studied by the effect of mass flow rate of liquid, gas and pintle opening distance. The liquid is ejected radially from a center gap to form a thin liquid sheet which is broken by gas jet from an annular gap axially. To simulate this, the Lagrangian approach was employed. A 2D-axisymmetrical model is used in which Realizable K-epsilon model as a viscous model. Then, the primary and secondary breakup are performed by employing the single injection model and wave model based on Weber number. The spray angle and SMD are compared with the experimental data for validating the breakup model. The effect of increasing the mass flow rate of liquid at the lower pintle opening results a narrow dispersion angle that causes the poor mixing quality, which is recovered by increasing the mass flow rate of gas, where the dispersion angle is became wider. And, the effect of the pintle opening distance results a wider dispersion angle thereby the case with poor mixing quality at a lower opening distance is recovered. As a result, it is observed that the case with wider dispersion angle had a wide range of the mass fraction distribution of droplets along the radial position at X/D<SUB>pt</SUB> = 5.00 than the case with narrow dispersion angle. The dispersion angle, spray angle and mixing quality are compared with the correlating parameter <SUB> N K </SUB> . The comparison showed that the mixing quality, spray angle and dispersion angle are not changed largely after <SUB> N K </SUB> = 0.83.</P>