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Theoretical study of temperature dependent lattice anharmonicity in TlCl and TlBr
Rishi Pal Singh,Rajendra Kumar Singh 한국물리학회 2010 Current Applied Physics Vol.10 No.4
Effect of temperature on ultrasonic attenuation in BCC structured (CsCl-type) thallium halides (TlCl and TlBr) have been investigated in a wide temperature range 50–500 K for longitudinal and shear modes along [1 0 0], [1 1 0] and [1 1 1] directions of propagation. Starting with nearest neighbour distance and repulsive parameter and taking interactions up to next nearest neighbours, second and third order elastic moduli have been evaluated, which in turn have been used for evaluating thermal relaxation time,Gruneisen numbers, acoustic coupling constants, ultrasonic velocity and ultrasonic attenuation. Ultrasonic attenuation in these bcc structured crystalline materials has been found less than the fcc crystalline materials. The results have been discussed and compared with available data.
Saurabh Badoni,Reeku Chaudhary,Ravi Shekhar,Shweta Badoni,Ekhlaque Ahmad,Rishi Pal Gangwar,Kashi Nath Tiwari,Rajendra Singh Rawat,Deepshikha,Jai Prakash Jaiswal 한국작물학회 2017 Journal of crop science and biotechnology Vol.20 No.5
Stripe rust of wheat caused by the fungal pathogen is a destructive foliar disease of wheat. Thus, it is crucial step to characterize the resistant germplasm for stripe rust in a diverse germplasm pool for their ultimate utilization in efficient crop rust resistance breeding. In the present study, we followed two pronged strategies involving integrated phenotypic and molecular characterization of 440 diverse wheat germplasm lines for rust resistance. The germplasm panel was extensively evaluated in field epiphytotic conditions during two consecutive years. After rigorous screening, 72 accessions were successfully revealed as resistant to moderately resistant to stripe rust. Subsequently, entries were then evaluated for their field agronomicperformances, considering prerequisites for serving as a donor germplasm,particularly for yield and 33 potential rust-resistant accessions were identified. Furthermore, to detect the sources of resistance, accessions were molecular characterized for potential race-specific resistance genes Yr5, Yr10,Yr15, and effective adult plant resistance (APR) gene Lr34/Yr18/pm38. We identified the 22 accessions possessing one or more single resistance genes and two accessions were observed with at least three of them. Moreover, Lr34/Yr18/pm38 was determined to confer resistance when observed along with any of the race-specific genes. Thus, the study not only provides proof of concept methodology to identify candidate resistant sources from large germplasm collections but simultaneouslyconfirmed the contribution of combining race-specific andnon-specific APR genes. The finding could further assist in the potential deployment of resistant genes directly into the stripe rust breeding program by involving marker-assisted approaches.