Micropropagation of fruit crops: a review

In vitro culture has the greatest commercial value in the extremely quick creation of clonal plants compared to conventional techniques of propagation. It has also proven to be of tremendous practical utility as assistance to the development and maintenance of disease-free planting material, germplasm conservation, and supplements to the regular methods of plant progress, such as plant genetic engineering. The discovery and implementation of current tissue culture techniques are thought to be paving the way for a second green revolution. Here, the standardization of techniques for the in vitro clonal propagation of fruit crops is highlighted. In addition, we summarize the effects of several surface sterilizing agents, plant growth regulators (PGRs), and anti-phenolic chemicals on culture establishment, shoot proliferation, in vitro rooting, hardening and economics of in vitro generation of true-to-type plants

Hydrolytic cleavage of paraoxon and parathion by oximate and functionalized oximate ions: A comparative study

Bimolecular reactions of O,O-diethyl-O-p-nitrophenylphosphate (paraoxon) and O,O-diethyl-O-p-itrophenyl phosphorothioate (parathion) with oximate (pyridinealdoxime 2-PyOx- and 4-PyOx-) and its functionalized oximate, 4-(hydroxyimino)methyl)-1-alkylpyridinium bromide ions (alkyl = C10H21 (4- 10PyOx-); alkyl = C12H25 (4-C12PyOx-)) have been investigated in aqueous and cationic micellar media of cetylpyridinium bromide, cetyltrimethyl-ammonium bromide and cetyltetradecyltrimethylammonium bromide at pH 9.5 and 27 oC. Under the micellized condition, a 1.2×103 fold and 9.0×106 fold rate enhancement over the aqueous reaction of paraoxon (ko = 7.5×10-8s-1) and parathion (ko = 9.5×10-11) is observed

Phylogenetic studies reveal existence of multiple lineages of a single genotype of DENV-1 (genotype III) in India during 1956–2007

<p>Abstract</p> <p>Background</p> <p>Dengue virus type 1 (DENV-1) have been mostly circulating silently with dominant serotypes DENV-2 and DENV-3 in India. However recent times have marked an increase in DENV-1 circulation in yearly outbreaks. Many studies have not been carried out on this virus type, leaving a lacunae pertaining to the circulating genotypes, since its earliest report in India. In the present study, we sequenced CprM gene junction of 13 DENV-1 isolated from Delhi and Gwalior (North India) between 2001–2007 and one 1956 Vellore isolate as reference. For comparison, we retrieved 11 other Indian and 70 global reference sequences from NCBI database, making sure that Indian and global isolates from all decades are available for comparative analysis.</p> <p>Results</p> <p>The region was found to be AT rich with no insertion or deletion. Majority of the nucleotide substitutions were silent, except 3 non-conservative amino acid changes (I → T, A → T and L → S at amino acid positions 59,114 and 155 respectively) in the Indian DENV-1 sequences, sequenced in this study. Except two 1997–98 Delhi isolates, which group in genotype I; all other Indian isolates group in genotype III. All Indian genotype III DENV-1 exhibited diversity among them, giving rise to at least 4 distinct lineages (India 1–4) showing proximity to isolates from diverse geographic locations.</p> <p>Conclusion</p> <p>The extensive phylogenetic analysis revealed consistent existence of multiple lineages of DENV-1 genotype III during the last 5 decades in India.</p

WIDER Advisory Group on International Economic Issues

(A research and training centre of the United Nations University

Exergetic performance analysis of solar air heater with inverted L-shape ribs as roughness element

Improvement in the exegetic efficiency of a solar air heater (SAH) can be done by enhancing the rate of heat transfer. In this work, the exergetic efficiency optimization of an artificially roughened solar air heater having an inverted L-shape rib has been performed. The numerical analysis of the exergetic performance of the solar air heater was carried out at a constant heat flux of 1000 W/m2 . The study was conducted to investigate the effect of different relative roughness pitch (7.14–17.86) on the exergy losses, under the Reynolds number range of 3000 to 18 000. The roughness parameter of this geometry has been optimized and found to be among functional operating parameters like average solar intensity and temperature rise across the collector. The optimized value of relative roughness pitch is 17.86 at the isolation of 1000 W/m2 , and the parameter of temperature rise ranges from 0.005 to 0.04

Photocatalytic degradation of hazardous Rhodamine B dye using sol-gel mediated ultrasonic hydrothermal synthesized of ZnO nanoparticles

The present study is focused on the sol-gel ultrasonic hydrothermal synthesis of zinc oxide (ZnO) nanoparticles and its application in the degradation of Rhodamine B (RhB) dye. ZnO nanoparticles were synthesized with varying temperatures at 90 °C, 190 °C and 550 °C. Zinc nitrate hexahydrate [Zn(NO3)2·6H2O] and potassium hydroxide were used to prepare ZnO nanoparticles and investigated using the X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and diffuse reflectance spectroscopy (DRS) for crystallinity, surface morphology, and band gap, respectively. Results obtained from XRD analysis shows that the synthesized ZnO nanoparticles are of hexagonal structure and crystalline in size ranged from the 21.1–32.41 nm. The effects of temperature show that the crystalline size of ZnO increased with increasing temperature and surface morphology investigated by FESEM. DRS used to calculate the band gap of nanoparticles shows that 3.26 eV at 90 °C, 3.25 eV at 190 °C and 3.23 eV at 550 °C. The optimal condition was determined using the response surface methodology (RSM) based Box Behnken design (BBD) method. We found that the ZnO material synthesized at 90 °C exhibits a smaller size, providing a larger surface area for photocatalytic degradation of the RhB dye. Energy is saved as it was synthesized at low temperatures. The maximum removal efficiency of Rohdamine B (RhB) dye (25 mg/L) obtained were 95% at optimized conditions i.e. pH 7, 2 g/L catalyst dose after 70 min of ultraviolet photocatalytic treatment

Real Minimum Wage and Growth Theory: Simulations and Some Policy Results

A Solow type two-sector growth model is used to examine several issues related to growth and unemployment in a minimum wage economy. By simulating the model, we demonstrate that given the same percentage increase in wage rate, an economy with a higher capital-labor ratio is more likely to decay. More importantly, a tariff policy reduces the unemployment periods by 92% provided that the current capital-labor ratio is one-sixth of that of the steady state capital-labor ratio. We assume that the first best policy of uniform wage subsidy is not politically feasible.Minimum wage, decay, growth, unemployment,