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Extracellular synthesis of silver nanoparticle by Pseudomonas hibiscicola - Mechanistic approach
Punjabi, Kapil,Mehta, Shraddha,Yedurkar, Snehal,Jain, Rajesh,Mukherjee, Sandeepan,Kale, Avinash,Deshpande, Sunita Techno-Press 2018 Advances in nano research Vol.6 No.1
Biosynthesis of nanoparticles has acquired particular attention due to its economic feasibility, low toxicity and simplicity of the process. Extracellular synthesis of nanoparticles by bacteria and fungi has been stated to be brought about by enzymes and other reducing agents that may be secreted in the culture medium. The present study was carried out to determine the underlying mechanisms of extracellular silver nanoparticle synthesis by Pseudomonas hibiscicola isolated from the effluent of an electroplating industry in Mumbai. Synthesized nanoparticles were characterized by spectroscopy and electron microscopic techniques. Protein profiling studies were done using Sodium Dodecyl Sulphate Polyacrylamide Gel Electrophoresis (1D-SDS PAGE) and subjected to identification by Mass Spectrometry. Characterization studies revealed synthesis of 50 nm nanoparticles of well-defined morphology. Total protein content and SDS PAGE analysis revealed a reduction of total protein content in test (nanoparticles solution) samples when compared to controls (broth supernatant). 45.45% of the proteins involved in the process of nanoparticle synthesis were identified to be oxidoreductases and are thought to be involved in either reduction of metal ions or capping of synthesized nanoparticles.
Sangeeta Kalal,Pinki Bala Punjabi,Narendra Pal Singh Chauhan,Noopur Ameta,Rakshit Ameta,Sudhish Kumar 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.12
The heterogeneous photo-Fenton like process is a green chemical pathway. It has an edge over conven-tional Fenton and photo-Fenton processes as it does not require the removal of ferrous/ferric ions in the form of sludge. We prepeared copper pyrovanadate or Volborthite (Cu3V2(OH)2O7·2H2O) composite photocatalyst by wet chemicalmethod. The photocatalyst was characterized by SEM, XRD, IR, TGA/DSC, EDX and BET. Experiments demon-strated that catalyst could effectively catalyze degradation of neutral red and azure-B in presence of H2O2 in visiblelight. Moreover, the photo-Fenton-like catalytic activity of Cu3V2(OH)2O7·2H2O was much higher than CuO and V2O5,when used alone as photocatalyst. The effect of variation of different parameters, i.e., pH, amount of photocatalyst,concentration of dye, amount of H2O2 and light intensity was also investigated. The degradation was well fitted underpseudo-first-order reaction with a rate constant of 2.081×10−4sec−1and 3.876×10−4sec−1for neutral red and azure-B,respectively. Quality parameters of dye solutions before and after photo-Fenton degradation were also determined. Atentative mechanism involving•OH radical as an oxidant has been proposed. The high catalytic activity may be dueto the Cu3V2(OH)2O7·2H2O shell, which not only increased the surface hydroxyl groups, but also enhanced the interfacialelectron transfer. The catalyst has been found to possess good recyclability.
Sarika Mehta,Neelam Swarnkar,Madhuri Vyas,Jitendra Vardia,Pinki B. Punjabi,Suresh C. Ameta* 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.12
Under the framework of green chemistry, an efficient and extremely fast procedure for the synthesis of 5a-h through four-step procedure starting from 2-arylidenetetralin-1-one 1a-d under microwave irradiation is described. A considerable increase in the reaction rate has been observed with better yield. The structures of the synthesized compounds have been characterized on the basis of their elemental analysis and spectral data. Synthesized compounds 5a-h was evaluated for their antimicrobial activity. Some of the compounds exhibited appreciable activity.
Mehta, Sarika,Swarnkar, Neelam,Vyas, Madhuri,Vardia, Jitendra,Punjabi, Pinki B.,Ameta, Suresh C. Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.12
Under the framework of green chemistry, an efficient and extremely fast procedure for the synthesis of 5a-h through four-step procedure starting from 2-arylidenetetralin-1-one 1a-d under microwave irradiation is described. A considerable increase in the reaction rate has been observed with better yield. The structures of the synthesized compounds have been characterized on the basis of their elemental analysis and spectral data. Synthesized compounds 5a-h was evaluated for their antimicrobial activity. Some of the compounds exhibited appreciable activity.
( Amith R ),( Girish Ramteke ),( Dharmendra Jhavar ),( Lalan Pratap Singh ),( Anu Daber ),( Manoj Gupta ),( Nd Punjabi ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Antithyroid drugs are used to treat toxic multinodular goitre(TNG). Carbimazole is usually the drug of choice except in pregnancy where propylthiouracil is used. It is well tolerated and common side effects include allergy, upper GI upset, rarely agranulocytosis. Hepatitis is rare but serious complication.We report a 55yr female with TNG, who developed cholestatic hepatitis after carbimazole therapy for 2 months. She recovered completely following withdrawal of the drug.Toxic multinodular goitre (Plummer`s disease) is a 2nd most common cause for hyperthyroidism after Grave`s disease, 15-30% cases, (>50 years) and women. Unlike Grave`s disease which is autoimmune and antithyroids are started universally, TNG is not known to recur after therapy. So surgery or radioiodine are treatment of choice. Antithyroids are used for symptomatic relief in patients waiting surgery. Side effects are mild, include allergic reactions, upper GI intolerance, agranulocytosis, vasculitis-like reaction particularly propylthiouracil. Hepatotoxicity is rarebut serious side-effect with both carbimazole and propylthiouracil (PTU). Histology with PTU shows toxic hepatitis &necrosis and it is cholestatic hepatitis with carbimazole. Our case demonstrates carbimazole induced cholestatic hepatitis in patient with TNG. Clinical,biochemical fi nding with relevant review of literature is presented. Patient was put on propranolol, prednisolone in the interim for her thyrotoxicosis and exophthalmosis. Liver function tests improved signifi cantly following stoppage of carbimazole. The high degree of alkaline phosphatase could also be due to effect of hyperthyroidism on bone resorption. She is currently euthyroid. In summary, jaundice as a complication of thionamide treatment of hyperthyroidism is rare, this complication cannot be predicted by deranged liver enzymes at presentation, but typically occurs within three months of therapy, it can be fatal, particularly when there are additional hepatotoxic factors, and the drug must be withdrawn immediately and alternative therapy, such as radioiodine must be considered in appropriate patients.
Bacterial Logic Devices Reveal Unexpected Behavior of Frameshift Suppressor tRNAs
Sawyer, Eric M.,Barta, Cody,Clemente, Romina,Conn, Michel,Davis, Clif,Doyle, Catherine,Gearing, Mary,Ho-Shing, Olivia,Mooney, Alyndria,Morton, Jerrad,Punjabi, Shamita,Schnoor, Ashley,Sun, Siya,Suresh, Korean Society for Bioinformatics 2012 Interdisciplinary Bio Central (IBC) Vol.4 No.3
Introduction: We investigated frameshift suppressor tRNAs previously reported to use five-base anticodon-codon interactions in order to provide a collection of frameshift suppressor tRNAs to the synthetic biology community and to develop modular frameshift suppressor logic devices for use in synthetic biology applications. Results and Discussion: We adapted eleven previously described frameshift suppressor tRNAs to the BioBrick cloning format, and built three genetic logic circuits to detect frameshift suppression. The three circuits employed three different mechanisms: direct frameshift suppression of reporter gene mutations, frameshift suppression leading to positive feedback via quorum sensing, and enzymatic amplification of frameshift suppression signals. In the course of testing frameshift suppressor logic, we uncovered unexpected behavior in the frameshift suppressor tRNAs. The results led us to posit a four-base binding hypothesis for the frameshift suppressor tRNA interactions with mRNA as an alternative to the published five-base binding model. Conclusion and Prospects: The published five-base anticodon/codon rule explained only 17 of the 58 frameshift suppression experiments we conducted. Our deduced four-base binding rule successfully explained 56 out of our 58 frameshift suppression results. In the process of applying biological knowledge about frameshift suppressor tRNAs to the engineering application of frameshift suppressor logic, we discovered new biological knowledge. This knowledge leads to a redesign of the original engineering application and encourages new ones. Our study reinforces the concept that synthetic biology is often a winding path from science to engineering and back again; scientific investigations spark engineering applications, the implementation of which suggests new scientific investigations.