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Ishwar H. Boodi,Santosh K. Pattanashetti,Basavaraj D. Biradar,Gopalakrishna K. Naidu,Virupakshi P. Chimmad,Anand Kanatti,Manoj K. Debnath 한국작물학회 2016 Journal of crop science and biotechnology Vol.19 No.2
Iron deficiency chlorosis (IDC) causes a significant reduction in yield of groundnut grown in calcareous and alkaline soils in India. The main aim of the study was to assess genotypic differences for morpho-physiological parameters associated with IDC resistance across different stages and their effect on yield and its related traits. The factorial pot experiment was comprised of two major factors, i) soil-Fe status [normal-Fe, deficit-Fe], and ii) genotypes [five] with differential IDC response, constituting 10 treatments. They were assessed for five morpho-physiological parameters associated with IDC resistance across five crop growth stages and also yield and its related traits. Associations between these traits were also estimated. Under deficit-Fe conditions, IDC resistant genotypes recorded significantly lower visual chlorosis rating (VCR), higher SPAD values, active Fe, chlorophyll content, peroxidase activity, and high yield compared to susceptible ones. Between normal- to deficit-Fe soils, resistant compared to susceptible genotypes showed no change in VCR scores; a lower reduction in SPAD, chlorophyll, active Fe, peroxidase activity, and pod yield. Under deficit-Fe conditions, high yield among resistant genotypes could be attributed to higher seed weight, number of pods and haulm yield, while contrasting reduction in main stem height and number of primaries. The results indicate that for initial large-scale screening of groundnut genotypes for IDC resistance, SPAD values are most ideal while active Fe could be utilized for confirmation of identified lines.
Ishwar H. Boodi,Santosh K. Pattanashetti,Basavaraj D. Biradar,Gopalakrishna K. Naidu,Virupakshi P. Chimmad,Anand Kanatti,Vinod Kumar 한국작물학회 2016 Journal of crop science and biotechnology Vol.19 No.3
Iron deficiency chlorosis (IDC) causes a significant reduction in yield of groundnut grown in calcareous and alkaline soils in India. The main aim of the study was to assess genotypic differences for morpho-physiological parameters associated with IDC resistance across different stages and their effect on yield and its related traits. The factorial pot experiment was comprised of two major factors, i) soil-Fe status [normal-Fe, deficit-Fe], and ii) genotypes [five] with differential IDC response, constituting 10 treatments. They were assessed for five morpho-physiological parameters associated with IDC resistance across five crop growth stages and also yield and its related traits. Associations between these traits were also estimated. Under deficit-Fe conditions, IDC resistant genotypes recorded significantly lower visual chlorosis rating (VCR), higher SPAD values, active Fe, chlorophyll content, peroxidase activity, and high yield compared to susceptible ones. Between normal- to deficit-Fe soils, resistant compared to susceptible genotypes showed no change in VCR scores; a lower reduction in SPAD, chlorophyll, active Fe, peroxidase activity, and pod yield. Under deficit-Fe conditions, high yield among resistant genotypes could be attributed to higher seed weight, number of pods and haulm yield, while contrasting reduction in main stem height and number of primaries. The results indicate that for initial large-scale screening of groundnut genotypes for IDC resistance, SPAD values are most ideal while active Fe could be utilized for confirmation of identified lines.
Ishwar B. Bajaj,Rekha S. Singhal 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.4
The effects of aeration and agitation on the production and molecular weight of poly (γ-glutamic acid)(PGA) were systematically investigated in batch fermentor cultures of Bacillus licheniformis NCIM 2324. A high aeration rate and agitation speed enhanced the growth of B. licheniformis NCIM 2324, but did not always lead to high PGA production. Additionally, PGA production actually decreased at very high aeration rates and agitation speeds. The maximum PGA concentration was obtained at 750 rpm and 1 vvm. Rheological studies revealed that fermentation broth during production of PGA exhibited pseudoplastic behavior. The effects of aeration and agitation on the molecular weight of PGA were also studied, and the rate and extent of the decrease in the molecular weight of PGA as a function of time were found to be much greater at high aeration than low aeration. The PGA production of 46.34g/L with a specific productivity of 0.17 g-PGA/g-biomass/h and a PGA yield of 0.48 with respect to total substrate observed in the present study are much higher than the values reported in previously conducted studies.
KUMAR, AVDHESH,ISHWAR, B. The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
In this paper we have examined the linear stability of triangular equilibrium points in the photogravitational restricted three body problem when both primaries are triaxial rigid bodies, the bigger one an oblate spheroid and source of radiation. The orbits about the Lagrangian equilibrium points are important for scientific investigation. A number of space missions have been completed and some are being proposed by various space agencies. We analyze the periodic motion in the neighbourhood of the Lagrangian equilibrium points as a function of the value of the mass parameter. Periodic orbits of an infinitesimal mass in the vicinity of the equilibrium points are studied analytically and numerically. The linear stability of triangular equilibrium points in the photogravitational restricted three body problem with Poynting-Robertson drag when both primaries are oblate spheroids has been examined by A. Kumar (2007). We have found the equations of motion and triangular equilibrium points for our problem. With the help of the characteristic equation we have discussed stability conditions. Finally, triangular equilibrium points are stable in the linear sense. It is further seen that the triangular points have long or short periodic elliptical orbits in the same range of ${\mu}$.
한치환,Hak-Soo Lee,Kyung-won Lee,Sang-Do Han,Ishwar Singh 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.1
TiO2 doped with Er3+ and Yb3+ was used for fabricating a scattering layer and a nano-crystalline TiO2 electrode layer to be used in dye-sensitized solar cells. The material was prepared using a new sol-gel combustion hybrid method with acetylene black as fuel. The Er3+- Yb3+ co-doped titanium oxide powder synthesized at 700oC had embossed structure morphology with a size between 27 to 54 nm that agglomerated to produce micron size particles, as observed by the scanning electron micrographs. The XRD patterns showed that the Er3+- Yb3+ co-doped titanium oxide had an amorphous structure, while using the same method without doping Er3+ or Yb3+, TiO2 was obtained in the crystallite form with thea dominance of rutile phase. Fabricating a bilayer structure consisting of nano-crystalline TiO2 and the synthesized Er3+- Yb3+ co-doped titanium oxide showed better scattering property, with an overall increase of 15.6% in efficiency of the solar cell with respect to a single nano-crystalline TiO2 layer.
Minhas, Sachin,Bhalla, Sunita,Shokeen, Yogender,Jauhri, Mayank,Saxena, Renu,Verma, Ishwar Chandra,Aggarwal, Shyam Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.5
Cytotoxic T-lymphocyte antigen 4 (CTLA-4) is an important protein involved in the regulation of the immune system. The +49 G/A polymorphism is the only genetic variation in the CTLA-4 gene that causes an amino acid change in the resulting protein. It is therefore the most extensively studied polymorphism among all CTLA-4 genetic variants and contributions to increasing the likelihood of developing cancer are well known in various populations, especially Asians. However, there have hiterto been no data with respect to the effect of this polymorphism on breast cancer susceptibility in our North Indian population. We therefore assayed genomic DNA of 250 breast cancer subjects and an equal number of age-, sex- and ethnicity-matched healthy controls for the CTLA-4 +49 G/A polymorphism but no significant differences in either the gene or allele frequency were found. Thus the CTLA-4 +49 G/A polymorphism may be associated with breast cancer in other Asians, but it appears to have no such effect in North Indians. The study also highlights the importance of conducting genetic association studies in different ethnic populations.