Challenging areas in chemical sciences
p. 0407

Diminishing discharges of mountain springs in a part of Kumaun Himalaya
p. 0417 | Valdiya, K. S.; Bartarya, S. K.

Phenylalanine ammonia-lyase: An update of its kinetics
p. 0427 | Khan, Nayeem Ullah; Bhat, Manzoor Ahmad; Vaidyanathan, C. S.

Cell-mediated immune response to egg drop syndrome-76 (EDS-76) virus infection in chickens
p. 0431 | Kumar, K. Umesh; Rishnaswamy, S. K.; Reddy, T. Venkata

First report on production of supermale tilapia by integrating endocrine sex reversal with gynogenetic technique
p. 0434 | Varadaraj, K.; Pandian, T. J.

Laser-excited Raman spectrum and vibrational analysis of thiophosphoryl dibromo- fluoride
p. 0442 | Mohan, S.; Payami, Feridoun; Madivanane, R.

Chemistry of lichen products, Part VII: Some new amide derivatives from the reaction of acid hydrazides with pulvinic dilactone
p. 0444 | Rao, P. S.; Raju, K. Ramesh; Raju, K. Raghava

Record of inarticulate brachiopods from the arenaceous member of the Tal Formation, Garhwal Syncline, Lesser Himalaya, India
p. 0446 | Mathur, V. K.; Joshi, Ashutosh

Effect of acetohydroxamic acid and p -hydroxymercuribenzoate on urease activity of blue-green algae
p. 0449 | Singh, Surendra

Histological studies of microsporogenesis and male gametophyte development in ambrette ( Abelmoschus moshatus Medic. )
p. 0450 | Vijaya, G.; Farooqi, A. A.; Joshi, Shyamsundar; Nagarajaiah, C.

Effect of gibberellic acid and glutathione and their interaction on floral development in Tridax procumbens L.
p. 0452 | Adinarayana, B.; Rao, P. Gopala

Humic acid induced reversal of retarding effect of morphactin in Eruca vesicaria (Linn. ) Cav. subsp. sativa (Mill. ) Thell
p. 0454 | Singhvi, N. R.; Sharma, K. D.

Foliar applications of urea and zinc sulphate for fruit drop control in Kinnow mandarin
p. 0456 | Gupta, O. P.; Jawanda, J. S.; Gupta, K. R.

Outbreak of Sclerotina white mould disease in India
p. 0456 | Singh, R. B.; Agrawat, J. M.

On the association of rice tungro virus components with tungro disease
p. 0457 | Jain, R. K.; Mishra, M. D.

Vesicular-arbuscular mycorrhizal associations of castor and safflower
p. 0459 | Sulochana, T.; Manoharachary, C.

Vesicular-arbuscular mycorrhizal association in mulberry
p. 0461 | Katiyar, R. S.; Das, P. K.; Choudhury, P. C.; Ghosh, A.; Sengupta, K.

An induced leaf differentiation mutant in Sesamum indicum L
p. 0464 | Murty, B. R.; Oropeza, F.

Coccidoxenoides peregrina: A new parasitoid of Planococcus citri in India
p. 0466 | Krishnamoorthy, A.; Mani, M.

Encentridophorus similis (Acarina: Unionicolidae), an active predator of mosquito larvae
p. 0466 | Rajendran, R.; Prasad, R. S.

Beauveria bassiana (Bals. ) Vuili., a possible biocontrol agent against Mylloceros viridanus Fabr. and Calopepla leayana Latreille in south India
p. 0467 | Sankaran, K. V.; Mohanadas, K.; Ali, M. I. Mohamed

Influence of methoprene on the male reproductive system of Oryctes rhinoceros (Coleoptera: Scarabacidae)
p. 0469 | Jacob, Mariamma

Effect of penicillic acid on isolated frog heart
p. 0471 | Nayeem, Mohammed; Pandiyan, V.; Nanjappan, K.; Ramamurthi, R.

Aggregation of platelets by fish collagen: Effect of side chain acetylation
p. 0473 | Ramesh, D. Vijaya; Sehgal, P. K.; Dhar, S. C.

Studies on culture pearl production from freshwater mussels
p. 0474 | Ram, K. Janaki

Announcements
p. 0476