Informatics Publishing Limited

J. Satisha ¹, G. S. Prakash ², R. M. Bhatt ³, P. Sampathkumar ²

Affiliations
1 National Research Centre for Grapes, P.B. # 3, Manjari Farm, Solapur Road Pune – 412 307, IN
2 Division of Fruit Crops, Indian Institute of Horticultural Research, Bangalore - 560 089, IN
3 Division of Plant Physiology and Biochemistry, Indian Institute of Horticultural Research, Bangalore - 560 089, IN

Abstract

Four varieties of grape namely Flame Seedless, Thompson Seedless, Sharad Seedless and Tas-A-Ganesh were subjected to different levels of moisture stress to study their physiological response. Stress was imposed for 14 days by withholding irrigation. Observations on relative water content, leaf water potential, leaf osmotic potential and gas exchange parameters like photosynthetic rate, transpiration rate, stomatal conductance and water use efficiency (WUE) were recorded. None of the varieties could survive for 14 days without irrigation (100% stress). Flame Seedless and Thompson Seedless at 50% moisture stress maintained higher turgidity as indicated by lesser reduction in relative water content and water potential attributed to better osmotic adjustment. Marginal reduction in photosynthesis and greater reduction in transpiration rate in the variety Flame Seedless may have resulted in higher WUE under moisture stress. Higher photosynthetic rate, lower transpiration rate, higher water relation parameters and high WUE in Flame Seedless under soil moisture stress indicated its better tolerance to drought.

Keywords

Grape Varieties, Soil Moisture Stress, Water Potential, Water Use Efficiency.

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G. Arunkumar , P. Sampathkumar , S. Sukumar

Abstract

The effect of web corrugation and h_w/t_w ratio on the flexural strength of cold formed steel (CFS) lipped I section is presented in this paper. Totally five specimens were experimented one with flat web and the remaining with trapezoidal corrugation in web. The length of the specimen is kept constant for 3600 mm and h_w/t_w ratio is varied from 333.33 to 583.33 keeping all other parameters constant. All specimens are experimented under two point loading with simply supported condition. The experimental results are verified with finite element analysis using ANSYS software. Experimental and numerical results are compared with the predicted resistance by North American Specifications (AISI S100-2007) and Australian/Newzealand Standards (AS/NZS: 4600-2005). The experimental result shows that the flexural capacity of the corrugated web is larger than flat web. Within the parametric study the effect of h_w/t_w ratio on the flexural strength capacity is discussed and presented.

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S. Balakrishnan ¹, K. Kamalakannan ¹, M. Srinivasan ¹, P. Sampathkumar ¹, G. Thirumalai ²

Affiliations
1 Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai - 608 502, Tamil Nadu, IN
2 Zoological Survey of India, Southern Regional Station, Chennai - 600 028, IN

Abstract

The water-striders, Halobates micans (Hemiptera: Gerridae) was described in 1822 by Eschscholtz based on the material procured from unspecified locality some where along the Southeast coast of India. The allotype of this species was designated by Eschscholtz, which was collected from Nagapattinani coastal waters.

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