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( Poonguzhali ),( Selvaraj ),( Munusamy Madhaiyan ),( Muthu Thangaraju ),( Jeoung Hyun Ryu ),( Keun Yook Chung ),( Tong Min Sa ) 한국미생물 · 생명공학회 2005 Journal of microbiology and biotechnology Vol.15 No.4
POONGUZHALI POONGUZHALI,SELVARAJ SELVARAJ,MADHAIYAN MUNUSAMY,THANGARAJU MUTHU,RYU JEOUNGHYUN,CHUNG KEUNYOOK,SA TONGMIN The Korean Society for Microbiology and Biotechnol 2005 Journal of microbiology and biotechnology Vol.15 No.4
Inoculation of the carrier-based mixed bioinoculants af N-fixer (Azospirillum lipoferum strain Az204/Rhizobium strain BMBS P47) and phosphate-solubilizing bacterium (Bacillus megaterium var phosphaticum strain Pb 1) promoted growth and yield of pearl millet and blackgram under pot-culture conditions. The mixed inoculant of Az204 and Pb 1 enhanced germination, seedling vigor, plant height, and seed weight, and resulted in $6\%$ increase in grain yield of pearl millet. Likewise, the mixed inoculant of BMBS P47 and Pb1 increased growth, nodulation, and yield in blackgram. The rhizosphere soil enzyme activities, including nitrogenase, urease, and phosphatase, in both pearl millet and blackgram were significantly increased by the inoculation of the mixed inoculant, compared to that of the individual inoculants. The results clearly indicate the beneficial effect of co-culturing the N-fixer and P-solubilizer in inoculants production.
Phosphate solubilizing bacteria (PSB) were isolated from the rhizosphere of Chinese cabbage and screened on the basis of their solubilization of inorganic tricalcium phosphate in liquid cultures. Ten strains that had higher solubilization potential were selected, and they also produced indole-3- acetic acid, 1-aminocyclopropane-1-carboxylate (ACC) deaminase, and siderophores. The strains were identified to be members of Pseudomonas, by 16S rDNA sequence analysis. Seed bacterization with PSB strains increased the root elongation and biomass of Chinese cabbage in seedling culture, although they had no effect on phosphorus uptake of plants. The plant growth promotion by PSB in this study could be due to the production of phytohormones or mechanisms other than phosphate solubilization, since they had no effect on P nutrition.
In this work, the corrosion and creep properties of weld beads produced on AA5083-H111 alloy using SpinArc gas metalarc welding process were analyzed. For that, bead on plate welding was carried out considering welding current, filler spindiameter and filler rotation speed as input parameters. It is evident from the microstructures that change in filler spin diameterand filler rotation speed altered the shape of weld bead irrespective of welding current. Also, porosities were formed atboth side walls where the columnar dendrites grow upward while the equiaxed dendrites zone contains comparatively fewerporosities. On comparing the left and a right side wall, a higher density of porosities are observed at the right side wall andthe direction of rotation was expected to be responsible for this occurrence. The pitting morphology of both side walls wasnot similar due to the variance in concentration of Mg and a higher amount of Mg exists on the right side wall led to theprecipitation of Mg-rich rich particles result in severe corrosion. A welding current of 130 Amps, the filler rotation speed of1050 rpm and filler spin diameter of 2 mm produced a high density of dislocations and a higher number of Fe and Mn-richintermetallics at grain interiors as well as grain boundaries, thereby, results in improved corrosion and creep properties ofweld. The weld contains larger porosities results in poor corrosion and creep properties.
Corrosion fatigue behavior of type 316N stainless steel (SS) weldments on the damage characteristics is studied. The S–Ncurve of the fatigue life versus stress amplitude showed a specific two slope Basquin relationship. At low stress amplitude,the deformation microstructure consists mainly of planar slip dislocation structure and at high-stress amplitudes, planarmultiple slip dislocations govern the cyclic behavior. A correlation between microstructural changes and the correspondingsusceptibility of 316N SS weldment in as-welded condition towards environmental cracking in boiling acidified aqueoussolution has been presented. The objective of the present study is to investigate the environmental effects on the corrosionfatigue crack initiation of type 316N weldmetal under the influence of cyclic stress amplitude. The difference in deformationmicro mechanisms with stress amplitude in a corrosive environment is believed to be the major reason for the occurrence ofa specific bilinear Basquin relationship in the S–N curve.
with rice plants from diferent cultivars was enumerated atthre diferent stages: vegetative, flowering, and harvesting.The bacterial population in the leaf, rhizosphere soil, endophyticin the stem and roots, and epiphytic in the florets and grainswere determined from four rice cultivars, Il-mi, Nam-pyeoung,O-dae, and Dong-jin, sampled from thre different field sites.The methylotrophic bacteria isolated on AMS media containing0.5% methanol as the sole carbon source uniformly showedgroups and their distribution among the various samples wasdetermined using the ecophysiological index. The growthstage at the time of sampling had a more significant efect onthe methylotrophic population and their distribution than thefield site or cultivar. A similar effect was also observed for thePPFMs, where their population in diferent plant partsincreased from V10 to R4 and then decreased towards stageR9. A canonical discriminant analysis of the PPFM populationcultivars, sampled sites, and growth stages, although thevariations were more prominent among the growth stages.