In this issue
p. 0563

How cheap can a medicinal plant species be?
p. 0565 | Gupta, Akshey K.; Vats, S. K.; Lal, Brij

How intangible is the outside world?
p. 0566 | Bhattacharjee, S. K.

K-T fossil patterns dispute abrupt mass extinction
p. 0569 | Sankaran, A. V.

Niels Bohr-UNESCO Gold Medal
p. 0572

An improved method for the isolation of supercoiled plasmid DNA
p. 0572 | Babu, G. Jagadeesh; Rajamanickam, C.

A potential phosphorite deposit on the continental margin off Chennai
p. 0574 | Rao, V. Purnachandra; Rao, K. Mohan; Vora, K. H.; Almeida, F.; Subramanian, M. M.; Godfrey, C.; Souza, A.

A profile of senior research associates: Characteristics and trend analysis
p. 0578 | Patil, S.; Das, S. R.; Pal, A. K.; Ahuja, I. M. L.; Sehgal, Y. P.; Ranglani, G.

The orgin of adaptive mutations: Explaning the mutational spectra of Lac+ revertants of the Escherichia coli strain FC40
p. 0583 | Bhattacharjee, S. K.; Mahajan, S. K.

Biochemical and molecular basis of differentiation in plant tissue culture
p. 0591 | Dey, Madhusudan; Kalia, Sanjeev; Ghosh, Sagar; Guha-mukherjee, Sipra

Visulization studies of cloud-like flows
p. 0597 | Venkatakrishnan, L.; Bhat, G. S.; Prabhu, A.; Narasimha, R.

Possible impact of tidal frequencies on the predictability of the earth's axial rotation
p. 0606 | Tiwari, R. K.; Rao, K. N. N.

Wear in composites: An in vitro study on dental compsite fillers
p. 0611 | Krishnan, V. Kalliyana; Mair, Lawrence H.

Petrochemistry and petrogenesis of Kalpatta granite, South India
p. 0613 | Kumar, S. N.; Prasannakumar, V.; Nair, P. K. R.

Carbon and oxygen isotopic variation in Tamil Nadu carbonatites, south India
p. 0620 | Pandit, M. K.; Sial, A. N.; Sukumaran, G. B.; Ramanathan, S.; Ferreira, V. P.

Studies on spin-labelled peptide nucleic acid
p. 0624 | Li, Xiao Xu; Huang, Chengang; Wang, Yanguang; Chen, Yaozu; Zhang, Liangren; Lu, Jinfeng; Zhang, Lihe

Strategy based on plasmid incompatibility for Tn5 mutagenesis in Erwinia herbicola ATCC 21998
p. 0627 | Vakhlu, J.; Johri, S.; Verma, V.; Qazi, G. N.

Agrobacterium- mediated genetic transformation in Gerbera hybrida
p. 0630 | Nagaraju, V.; Srinivas, G. S. L.; Sita, G. Lakshmi

Influence of pressmud on the enzymatic variations in the different reproductive stages of Eudrilus eugeniae (Kinberg)
p. 0634 | Ranganathan, L. S.; Vinotha, S. P.

Gene transfer in Indian major carps by electroporation
p. 0636 | Venugopal, T.; Pandian, T. J.; Mathavan, S.; Sarangi, N.

Critical Problems in Physics
p. 0639 | Nityananda, Rajaram

Darwin in 90 Minutes and Mendal in 90 Minutes
p. 0640 | Sinha, Anindya

Indian Institute of Technology Bombay
p. 0641

Indian Instiitute of Technology - Madras
p. 0642

Centre for Cellular and Molecular Biology (Council of Scientific and Industrial Research)
p. 0642

The Institute of Mathematical Sciences CIT Campus, Taramani
p. 0643

The Prof. T. N. Ananthakrishnan Foundation
p. 0644

Department of Chemistry University of Delhi
p. 0644