The inhibition effect of 2,3-dihydroxyflavone on the corrosion of mild steel in 100-600 ppm aqueous hydrochloric acid solution has been investigated by weight loss and electrochemical impedance spectroscopy. The corrosion inhibition efficiency increases with increasing concentration and time. The effect of temperature on the corrosion behavior of mild steel in 1 M HCl with addition of inhibitor was studied at the temperature range of 300-330 K. UV-Vis, FTIR, and surface analysis (SEM) was also carried out to establish the corrosion inhibitive property of this inhibitor in HCl solution. The adsorption of this inhibitor on the mild steel surface obeys the Langmuir adsorption isotherm. Electrochemical studies reveal that the inhibitor is a cathodic type.
Genetic variation provides the foundation for species to respond to changes in the natural environment. Self fertilization is a common mating system in plants, and is known to reduce genetic diversity; increase genetic structure and potentiality put population at greater risk of extinction. Hamelia patens Jacq. is an exotic ornamental plant, widely distributed in Indian garden. Even though the plant flowers throughout the year, it never produces seeds, and hence genetic diversity is lacking in this taxon. From the previous analysis it was found that, gametophytic self-incompatibility is operating in this plant. In the present study, 14 accessions of H. patens were collected from different parts of Kerala and found that, accession No.3 has significant morphological differences compared to other accessions. Crossing between morphologically similar plants from various localities failed to set-seeds, whereas crosses between morphologically dissimilar plants always set-seeds. This species have both self-incompatible (on selfing) and compatible (crossing) populations, and are there for ideal for understanding how the mating system affect genetic diversity and structure. In the present study, morphologically different plant shows genetic variability which is confirmed by random amplified polymorphic DNA analysis.
An efficient protocol for micropropagation of orchid Dendrobium barbatum Lindl. (Orchidaceae) using the fleshy stem segments was developed. Murashige Skoog (MS) basal medium supplemented with 1.0 mg L of Naphthalene Acetic Acid (NAA) + 2 .0mg L of Benzyl Amino Purine (BAP) for multiple shoot induction. The multiplied shoots were then transferred to half-strength MS medium supplemented with 1 mg L of Indole-3 acetic acid (IAA) or Indole-3 butyric acid (IBA) or NAA. Best response for shoot multiplication was achieved when the medium was supplemented with 1 mg L-1 NAA and 2mg L-1 BAP. While that for rooting with 1 mg l IBA. The plantlets were hardened off and survived plants were released to the shade house then to their epiphytic environment.
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