The effect of colchicine on stalk elongation in the colonial peritrich ciliate Carchesium sp. has been investigated by growing this protozoon in colchicine-containing media. The length of the stalk in control cultures was 0-4-0-9 mm. In the presence of 2-5-125 mM colchicine, stalk elongation was inhibited, and stalk length was inversely proportional to colchicine concentration. At concentration...

The fine structure of a series of stalked bacteria belonging to the genera Caulobacter and Asticcacaulis has been examined in thin sections. The cell wall has the multilayered structure typical of many Gram-negative bacteria, and continues without interruption throughout the length of the stalk. The core of the stalk, continuous with the cytoplasmic region of the cell, is enclosed in an extensi...

The present investigation entitled “Effect of plant growth regulators Gibberellic Acid (GA3) and Salicylic (SA) on the yield carnation under naturally ventilated polyhouse”, was carried out during November, 2021 to April 2022 in, Naturally Ventilated Polyhouse, Department Horticulture, Naini Agricultural Institute, SHUATS, it concluded that treatments rendered their significant effect almost al...

In a hypothesis that has remained controversial since its inception, Darwin suggested that long-tubed flowers and long-tongued pollinators evolved together in a coevolutionary race, with each selecting for increasing length in the other. Although the selective pressures that flowers impose on tongue length are relatively straightforward, in that longer tongues allow access to more nectar, selec...