Sudhir Chandra

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We have shown that the morphological features of the sol–gel derived thin films of ZnO depend strongly on the choice of the precursor materials. In particular, we have used zinc nitrate and zinc acetate as the precursor materials. While the films using zinc acetate showed a smoother topography, those prepared by using zinc nitrate exhibited dendritic(More)
This paper reports the design of a Ka-band Equilateral triangular patch antenna (ETPA) fabricated using postCMOS and post-MMIC compatible process technology. The antenna uses an air-cavity underneath the patch radiator that is supported on thin dielectric membrane. The antenna structure was analysed and optimised using the finite element method (FEM) based(More)
The fungi described in this paper were isolated during the course of a detailed survey of leaf-spot diseases of Allahabad and adjacent regions. A comparative s tudy indicated the forms reported here viz., Colletotrichum sp. from Sapindus lauri/olius VAHL., Pyrenochaeta sp. from Gardenia florida L. and Phoma sp. from Ehretia acuminata BR., to be distinct(More)
Silicon-On-Insulator (SOI) is a technological innovation that provides superior isolation with low leakage current and makes possible designing high voltage lateral devices. Currently advanced Bipolar Complementary Metal Oxide Semiconductor (BiCMOS) and Double Diffused MOS (DDMOS) devices on SOI are of great interest for their applications in high speed(More)
The endosperm is nuclear, cell wall initiation starts 5 days after pollination. During early stages endosperm nuclei exhibit synchrony in their division. Embryogeny is of the Asterad type. A7-to 10-celled suspensor persists up to the dicot stage of the embryo. Both integuments contribute towards formation of the seed coat. 30 days after pollination seeds(More)
Aspergillus terreus, the causal organism of fruit-rot of apples produced pectin methylesterase (PME) and depolymerase (DP) on a number of substrates. The production of polygalacturonase (PG) was restricted to few substances only and appeared to be adaptive. PME as well as hydrolytic activities were maximum when cultures were incubated at 25°C. The pH of the(More)
In the present work, we report the preparation of PLZT thin films in pure perovskite phase by RF magnetron sputtering without external substrate heating and their integration with micro-cantilevers. The ‘lift-off’ process for patterning different layers of a micro-cantilever including PLZT, Pt/Ti and Au/Cr was employed. The basic requirement of lift-off(More)
Colletotrichum gloeosporioides could grow and sporulate on a wide range of pH (viz., from 3.0 to 8.5). The best growth was obtained at pH 6.0. Mannitol proved to be the best carbon source. Good growth and sporulation were also observed on maltose, glucose, galactose and sucrose. Nitrates supported better growth than ammonium compounds. Glutamic acid was(More)
Worke r s on p l a n t m o r p h o g e n e s i s t e n d to equa t e all t h e ovules p r e sen t in a mn l t i ca rpe l l a ry se l f -pol l inated pis t i l when choos ing t h e m as e x p e r i m e n t a l ma t e r i a l [1-3]. D u r i n g a s t u d y of t he r ep roduc t ive b io logy of Abelmoschus esculentus var . ' P u s s S a w a n i ' we encoun t e(More)