Institute of Wood Science & Technology

Bangalore, India

Institute of Wood Science & Technology

Bangalore, India
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Sinha S.K.,Navsari Agricultural University | Vijendra Rao R.,Institute of Wood Science & Technology | Deepak M.S.,Institute of Wood Science & Technology
Tropical Ecology | Year: 2017

Total vessel lumen area (TVLA) of earlywood (EW) and latewood (LW) computed through image analysis has been analyzed to understand its relationship with the temporal variation of climate from dated tree-ring series of teak (Tectona grandis L.) from Western Ghats in Central Karnataka, India. The study showed that December rainfall of the previous year and May of the current year are the most important climatic variables in the development of large size EW vessel lumen area of an annual ring whereas rainfall of October and December (northeast monsoon) of previous year and June and September of current year played a significant role in the formation of small size LW vessel lumen area. Low temperature in December of previous year and low rainfall in February of succeeding year are important in the formation EW vessel lumen area while previous year’s high temperature of November is important for the formation LW vessel lumen area. Pre-monsoon (April–May) high temperature also has significant role in the initiation of cambial activity and the formation of EW and LW vessel lumen area. It is recorded that total vessel lumen area (TVLA) of earlywood showed more climatic signal than TVLA of latewood. © International Society for Tropical Ecology.


Aggarwal P.K.,Institute of Wood Science & Technology | Raghu N.,Institute of Wood Science & Technology | Kale A.,Institute of Wood Science & Technology | Vani C.N.,Institute of Wood Science & Technology | Chauhan S.,Institute of Wood Science & Technology
Journal of the Indian Academy of Wood Science | Year: 2015

Hydrophilic nature of ligno-cellulosic fibers can affect dimensional stability and interfacial bond strength of wood polymer composites. In this paper, moisture adsorption and absorption behaviour of bio-fiber filled high density polyethylene composites has been reported. Composites were prepared with wood pulp and bamboo flour at varying filler concentration and subjected to moisture adsorption and absorption. The magnitude of moisture absorption and adsorption increased with increasing filler content. Moisture adsorption in wood fiber based composites was higher than bamboo flour but there was no significant difference in their water absorption behaviour. Use of coupling agent exhibited a significant influence on the magnitude of water absorption by the composites. Composites with coupling agent absorbed 25–40 % less moisture as compared to the composites without coupling agent in both filler types. Moisture absorption behaviour in the composites was explained based on the theoretical Fickcian diffusion model. © 2015, Indian Academy of Wood Science.


Rajput G.,Dav Pg College | Pandey I.P.,Dav Pg College | Joshi G.,Forest Research Institute | Bisht S.S.,Institute of Wood Science & Technology
Journal of the Indian Academy of Wood Science | Year: 2015

The Cassia angustifolia seed gum (CAG) was isolated from the seeds of C. angustifolia and subjected to cyanoethylation by using acrylonitrile (AN) in presence of alkali (NaOH) in aqueous medium at different reaction conditions. The variables studied is comprised of alkali concentration, AN concentration, liquor:gum ratio as well as reaction temperature and time. The nitrogen content (%N), degree of substitution (DS) and reaction efficiency (RE) were determined. The optimum conditions for preparing cyanoethyl-CAG (%N = 6.36 %; DS = 0.969) comprised 0.100 mol of NaOH, 0.075 mol of acrylonitrile and liquor:gum ratio (v/w) of 10:1 at 45 °C for 60 min using 0.03 mol (as AGU, anhydroglucose unit) of CAG. RE was found to be 24.08 % under these conditions. Rheological studies of 1 and 2 % (w/v) cyanoethyl-CAG showed non-Newtonian pseudoplastic behaviour, relatively high viscosity, cold water solubility, solution stability and clarity as compared to the solutions of unmodified CAG. © 2015, Indian Academy of Wood Science.

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