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Toxicity Studies on Peristrophe paniculata (Forssk) Brummitt-an Ayurveda Drug.
R.V. Pradeep Chandran,A. Saraswathy,B. Murali Manohar,S. Vairamuthu 한국생약학회 2008 Natural Product Sciences Vol.14 No.2
Chronic oral toxicity studies (90 days) on aqueous and methanol extracts of the whole plant of Peristrophe paniculata (Forssk) Brummitt were carried out in Wistar rats. The dosage was 200 mg/kg/day, p.o. for both the extracts. All external morphological and biochemical changes, in addition to body weight and vital organ weights were recorded. During this investigation, no significant mortality was observed. The results showed that both the extracts were devoid of any toxicity at the dose level studied as compared to the control group.
Pradeep A. R.,Nair V. S. K. Korean Society of Sericultural Science 2005 International Journal of Industrial Entomology Vol.10 No.2
Though many insecticides are commercially available, development of resistance, pest resurgence and effects on non-target organisms led to the search for alternate insect pest management (IPM) strategy based on larval growth and reproductive fitness. Reproductive potential of insects depends on its acquiring of vitellogenic competence which is under hormonal control. Exogenous application of analogues of JR (JHAs) and ecdysterone could derail normal development and reproduction in insects by manipulating an array of physiological processes. In the rice pest, brown planthopper, Nilaparvata lugens, JHA, hydroprene induced metathetely from the fifth (final) instar nymphs in an age-dependent manner. Day 0 of the final instar showed highest sensitivity to induce this abnormal development. Adults emerged from treated day 3 nymphs looked normal. Both the morphotypes were reproductively incompetent and showed partial to complete sterility. Pre-adult exposure of the ovarian tissue to hydroprene suppressed mitotic division of germinal cells and induced abnormalities in the later s1ages of growth and differentiation of ovary in N. lugens. More over the nymphal exposure to hydroprene inhibited patency changes of follicular epithelium and affected competence of the follicles for yolk sequestration. In the absence of ovarian growth and oocyte differentiation, germarium found disintegrated, trophic core regressed and terminal oocytes resorbed. Hydroprene exposure to newly ecdysed brachypterous females did not affect ovarian development and egg production. Proper larval-adult transition appeared as a. prerequisite for vitellogenic competence in N. lugens for which the ovarian tissues must be exposed to ecdysterone in the internal milieu devoid of JH.
V. Vijayakumar,Pradeep Johnson,Ruban Whenish,A. John Rajan,Vincent H Wilson 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.4
The characteristics of Al 6061/SiCp Metal Matrix Composite (MMC) have been established for checking the suitability oflightweight spur gear using Powder Metallurgy (P/M) technique. Aluminium powder reinforced with SiCp particle withvarious weight.% (0, 5, 10 & 15) and particle sizes (35 μm and 65 μm). The smaller sized spur gears of 4 mm module, 48 mmpitch circle diameter and 22 mm face width were chosen. The complex gear profiled compaction die assembly was manufacturedfor making net shaped gear without any machining operation. The H frame hydraulic press was used to compact gear sampleswith compaction pressures of 132 MPa and 165 MPa. Then gear samples were sintered using muffle furnace at 570 ºC. Theprepared gear samples were used for density measurement, bending strength test, hardness measurement and microstructureanalysis. The research work leads to the observation of Al 6061 with 10 wt.% & 35 μm size of (SiCp) P/M gear exhibiting agreater enhancement of mechanical properties than the unreinforced Al alloy. Thus the effect of adding ceramic particles SiCpwith Al 6061 enhanced the mechanical properties and enabling Al 6061/SiCp composite spur gear suitable for lightweightapplications.
( A. R. Pradeep ),( V. S. K. Nair ) 한국잠사학회 2005 International Journal of Industrial Entomology Vol.10 No.2
Though many insecticides are commercially available, development of resistance, pest resurgence and effects on non-target organisms led to the search for alternate insect pest management (IPM) strategy based on larval growth and reproductive fitness. Reproductive potential of insects depends on its acquiring of vitellogenic competence which is under hormonal control. Exogenous application of analogues of JR (JHAs) and ecdysterone could derail normal development and reproduction in insects by manipulating an array of physiological processes. In the rice pest, brown plan-thopper, Nilaparvata lugens, JHA, hydroprene induced metathetely from the fifth (final) instar nymphs in an age-dependent manner. Day 0 of the final instar showed highest sensitivity to induce this abnormal development. Adults emerged from treated day 3 nymphs looked normal. Both the morphotypes were reproductively incompetent and showed partial to complete sterility. Pre-adult exposure of the ovarian tissue to hydroprene suppressed mitotic division of germinal cells and induced abnormalities in the later stages of growth and differentiation of ovary in N. lugens. More over the nymphal exposure to hydroprene inhibited patency changes of follicular epithelium and affected competence of the follicles for yolk sequestration. In the absence of ovarian growth and oocyte differentiation, germarium found disintegrated, trophic core regressed and terminal oocytes resorbed. Hydroprene exposure to newly ecdysed brachypterous females did not affect ovarian development and egg production. Proper larval-adult transition appeared as a. prerequisite for vitellogenic competence in N. lugens for which the ovarian tissues must be exposed to ecdysterone in the internal milieu devoid of JH.
Kumar,T. Sampath,Pradeep V. 한국유통과학회 2019 KODISA ICBE (International Conference on Business Vol.2019 No.-
The study applied Data Envelopment Analysis (DEA) to estimate total factor productivity growth and to identify the sources of productivity growth in the manufacturing sector of Tamil Nadu. The study considered 12 major sectors and estimated productivity growth and the major sources of productivity growth during the period 1981-82 to 2007-08. The study found that the productivity growth in the industrial sector of Tamil Nadu at the aggregate level during the test period was almost nil. While it is the case at the aggregate level, there are mixed results at the sectoral level. During the pre-reform period, there was significantly higher productivity growth in almost all the sectors contributed mainly by the improvements in efficiency. On other hand, there was productivity deterioration in the post-reform period since almost all the sectors witnessed negative productivity growth despite a technical change in the post-reform period. The study based on the empirical findings suggests that there will be productivity growth only if any improvement in the technology is accompanied by the corresponding improvement in the efficiency with which the technology can be turned into productivity gains. A well developed and skilled labour force along with the improvements in the technological developments will lead to higher productivity growth in the manufacturing sector both at the aggregate and sectoral level.