The hypothesis that auxin prevents abscission, in Coleus blumei, by causing growth has been confirmed in a number of different ways: (1) in the intact plant, petioles grow until just before abscission; (2) excising the blades causes uniformly fast abscission, which is correlated with uniform absence of elongation; (3) if one stimulates the debladed petioles to renewed growth by substituting IAA for the leaf‐blades, one can restore their longevity to that of the intact leaves; (4) increasing the concentration of IAA added to debladed petioles increases both the elongation and the longevity. However, the parallel between elongation and longevity was not exact: IAA concentrations giving full replacement of the blades in preventing abscission gave less than full replacement of elongation in petioles 2 and 3 and more than full replacement in petioles 5–8. Following the time‐course revealed that if an IAA‐treated debladed petiole elongates as much or more than normal during the first week after deblading, then it will have normal longevity.

Problem statement: The investigation for possible Preliminary Pharmacognostical and phytochemical activity of seeds of Syzygium cumini were performed to lay down the standards which could be useful in future experimental studies. Approach: The study includes macroscopy, microscopy, preliminary phytochemical screening and physicochemical evaluation of seeds of Syzygium cumini. Results: The results were discussed for both the extracts in terms of microscopy, macroscopy, phytochemical analysis. Conclusion: The present study provides a scientific rationale for the traditional use of seeds of Syzygium cumini in the management of wounds.

Mosquitoes of the family Culicidae are distributed worldwide and comprise about 3500 species. The diversity of the mosquito species varies among different geographical regions of the world. Assam is situated in the subtropical region with fluctuation in temperature in different seasons and heavy rainfall occurs in a particular period. So, mosquito vector surveys were conducted in different seasons to identify the distribution of different species of mosquito and to find out their seasonal patterns of abundance in the city of Guwahati situated in the south bank of the river Brahmaputra. Mosquito larvae were collected in the monsoon and the autumn season (July 2012 to October 2012) from different breeding sites including seven localities in the city using glass sucking pipette. pH and salinity of the water of the breeding sites were also measured. Altogether, seven mosquito species belonging to four genera namely Anopheles, Aedes, Mansonia and Culex were collected out of which the three genus Anopheles, Culex and Aedes are medically important vectors of several human diseases including, malaria, dengue, yellow fever, filariasis, Japanese encephalitis, chikungunya, etc. which are prevalent in this part of the region. The site selection for the present survey is mainly based on population density, water stagnation and unplanned drainage with poor garbage management sites of the Guwahati City of India. Most of the study sites were enriched with organic matter, sewage, green algae, short herbs, and upright vegetation. From the seven breeding sites, a total of 1557 mosquito larvae were collected. Among these, mosquito species, Culex quinquefasciatus was found to be most abundant species in the city comprising 29.92% (466 larvae) which was followed by Culex tritaeniorhynchus (26.08%, 406 larvae), Aedes aegypti (14.96%, 233 larvae), Anopheles minimus (12.01%, 187 larvae) and Aedes albopictus (6.29% , 98 larvae) of the total larvae collection.

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