Development of eco-friendly process for the synthesis of nanoparticles is one of the main steps in the area of nanotechnology. Green synthesis of nanoparticles is the evolution of nanobiotechnology. It is a low cost, environment benign, nontoxic and large scale up process. In this study, Bougainvillea glabra leaf extract was used for the bioreduction of gold ions to nanoparticles. Reduction of HAuCl4 by polyphenols present in leaves of B.glabra at different temperature provides AuNPs (Au3+→Au0 ). Bioreduction process was carried out to study about the factors affecting the nanoparticles synthesis by changing the gold ion concentration and temperature. 1mM gold ion concentration and temperature125 ºC is more favorable for maximum production of gold nanoparticles. UV-vis spectrum was used to characterize these synthesized gold nanoparticles and the SPR band was observed at 565 nm. The gold nanoparticles are characterized by FTIR.This green synthesis method has many advantages over the chemical method because it reduces the use of toxic metals in the synthesis process and it is a single step eco-friendly method.

A ‘chemistry driven approach’ to the synthesis of small molecules of medicinal interest was launched to explore the versatility of 3-benzoylmethyl indolin-2-one (3) (resulted on the reaction of isatin with acetophenone followed by reduction of the obtained enone derivative 2 with Na2S2O4 ) to provide synthetically acceptable protocols to the formation of indolin-2-one analogues substituted on its 3-position with pyrimidine derivatives (7- 12) respectively whose structure was unequivocally established from its micro analyses and spectral data.

A two series of metal complexes [M(LH)2(H2O)2] and [M(LH)2(caf)2] M=Cu(II),Ni(II),Cd(II),Zn(II),caf= caffeine, KHL=N-salicylidèneglycinate, have been synthesized and characterized by metal analysis, molar conductivity ,infrared, electronic and EPR spectral measurements N-salicylidèneglycinate (KHL) were obtained by condensation of salicylaldehyde, glycine and KOH. The stoichiometries reaction between the metal(II) ion and (KHL) ligand in molar ratio of M:LH(1,2) resulted in the formation of the metal complexes of type [M (LH)2 (H2O)2] or molar ratio of M:LH:Caf (1,2,2) of type [M (LH)2 (caf)2] (where M=Cu(II),Ni(II),Cd(II),Zn(II),caf= caffeine. The ligand LH acts in a chelate manner (NO) donor and coordination of water or caffeine by N9 coordination through metal ion. Keywords: caffeine, N-salicylidèneglycinate, complexes, molar conductivity.

In the field of coordination chemistry, extensive studies have been carried out on metal complexes formed by ligands having dual sites for coordination. Of these, thiosemicarbazides having N and S as donor atoms deserve a special mention. Interest in thiosemicarbazones (derivatives of thiosemicarbazides) as ligands mainly developed due to their flexibility which led to extremely variable behaviour in their reactions with transition and non-transition metals. Literature studies show that thiosemicarbazones exhibit a wide range of stereochemistry on complexation with transition metal ions. Technological advances have led to the development of sophisticated and sensitive instrumentations which provide avenues to probe into the structure and bonding in the complexes. Hence new metal complexes have been synthesised using chloride salt of Cobalt and thiosemicarbazone obtained by variation of the parent carbonyl compound. Magnetic and spectral studies have been carried out to obtain information regarding effect of coordination on the central metal ion (oxidation state in particular) and stereochemistry exhibited by these complexes. Key words:

Industrialization and modernization in now a days has made a strong demand of steel and their maintenance for a strong infrastructure for every country in the race of survival, stabilization, growth and competition. Atmospheric corrosion can aggressively accelerate the rate of degradation of steel during their manufacturing, processing, storage and transportation. In these cases, traditional methods to prevent corrosion are not suitable which provide scope of Vapour Phase Corrosion Inhibitors (VPCI) in industries, defense and daily life. Cetyltrimethylammoniumbromide (CTAB) was tested for mild steel in different aggressive atmospheric conditions by Weight loss test, Eschke test, Salt spray test, Sulphur dioxide (SO2) test at 50oC and results of these tests were supported by Metallurgical research microscopy and Scanning electron microscopy (SEM). Synergistic effect of CTAB were performed with Ethylamine (EA), N,N,N,NTetramethylethylenediamine (TMEDA) and N-Ethylaniline (NEA) to enhance the percentage corrosion inhibition efficiency (PCIE).

We report non-linear optical effects observed in colloidal nanofluids due to transmission of laser beam. A 10mW 632nm He-Ne Laser beam is passed through separate dispersions of magnetic and non-magnetic nanoparticles. Thermal lens induced diffraction patterns are observed in case of Fe3O4 nanoparticles dispersed in hexane and kerosene. In case of CdS nanoparticles dispersed in methanol, no such patterns were observed. This is useful in studying non-linear optical properties of nanofluids arising due to local heating of the medium by the laser establishing a refractive index gradient. Variation in non-linear optical properties is observed to be based on magnetic and non-magnetic nature of particles. In case of magnetic nanoparticle dispersions, the effect of magnetic field on the non-linear optical properties is also examined.

Parthenium Hysterophorus plant contains toxins called sesquiterpene lactones. The major component of toxin is Parthenin & other phenolic acids such as Caffeic acid, Vanillic acid, Anisic acid, Panisic acid, Chlorogenic acid & parahydroxy benzoic acid are found to be lethal to human beings and animals.The proposed work intend to obtain Parthenin from Parthenium Hysterophorus by solvent extraction and Soxhlet Extraction methods, using different solvents at different flow rates and to calculate Mass Transfer Coefficients (MTC) for each of the system, thereby exploring the possibility for the extraction of Parthenin from Parthenium Hysterophorus. The comparison of two applied methods shows that Soxhlet extraction is an efficient method by which solute of limited solubility can be extracted with higher efficiencies.Seemingly, the extraction of Parthenin from Parthenium Hysterophorus is a very complicated process. Our experiments indicate that the extracted amount of Parthenin is affected by several parameters like solvent properties, solvent volume, extraction time, temperature, particle size and the microstructure of the sample.

Densities and viscosities of glucose at constant temperature have been measured from experimental data. The apparent molar volume ( ), relative viscosity (nr) were calculated by using Jones-Dole equation. The results show strong ion-ion interaction that indicates for the observed viscosity concentration dependence of dilute electrolyte solutions

Industrial waste is one of the most important sources of contamination in the surface environment. The impact of heavy metals in soils, plants, animals and humans is due to the unabated expansion of toxic effects. Human activities all over the earth have increased environmental pollution by heavy metals in agricultural soil. Pollution of the biosphere with toxic metals has to accelerate dramatically since the beginning of the industrial revolution. Phytoremediation uses plants to remove pollutants from the environment. The use of metal accumulating plants clean - up soil and water contaminated with toxic metals. It is the most rapidly developing component of this environmentally friendly and cost - effective technology. The leather tanning effluent soil was collected and analyzed. The results also showed that the isolated Eclipta alba has the capacity to remove heavy metals (Cd, Cr, Cu, Pb & Zn) in the effluent soil. The metal removing capacity increased with increase in concentration of the metals. Keywords:

Irradiation of sunflower (Helianthus annus.L.) seeds to magnetic fields (MF) have influence on physiological processes. Seeds exposed to 500 μT for 48 hrs showed an enhancement of 24% in germination on day 3. The experiments carried out show that seeds previously treated with magnetic fields have increased water uptake, which may be the reason for the enhanced percentage germination and growth rate. The physical state of water in the seeds of both control and exposed groups were examined using nuclear magnetic resonance (H1 NMR) spectroscopy & imaging during imbibitions. NMR images of water distribution and proton transverse relaxation time (T2) were recorded during the first 15 hrs of imbibitions. NMR images reveal that hydration during this period is a multistage process. Higher concentration of water in the radical of treated seeds revealed that water penetration into the seed is more in treated seeds which must have contributed to faster germination and growth.