http://nopr.niscair.res.in/handle/123456789/13474 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/13505 Title: Bioethanol fermentation from untreated and pretreated lignocellulosic wheat straw using fungi <i style="">Fusarium oxysporum</i> <br/> <br/>Authors: Hossain, Sk Masud; Anantharaman, N; Das, Manas <br/> <br/>Abstract: A comparison has been made among untreated, lime pretreated and dilute alkaline peroxide pretreated wheat straw for bioethanol production by simultaneous saccharification and fermentation (SSF) process in a continuous stirred batch bioreactor (CSBR) using fungi <i>Fusarium oxysporum</i>. The optimum parameters used for the bioethanol fermentation are: time 48 h, <i style="">p</i>H 6, temperature 50, stirring speed 35, and wheat straw loading 35 g/L. Maximum yield of ethanol is found to be 0.756 , 0.796 and 0.810 g/g of wheat straw under optimum conditions for untreated, lime pretreated and dilute alkaline peroxide<i style=""> </i>pretreated<i style=""> </i>wheat straw. The sp. fungal growth rate is found to be 5.26 , 5.40, and 5.88 s⁻¹and maximum sp. fungal growth rate is 10.52, 10.80 and 11.76 s⁻¹using the Monod model for the fermentation of untreated, lime pretreated and dilute alkaline peroxide<i style=""> </i>pretreated wheat straw under optimum conditions respectively. The fungal growth kinetic parameters are 33.6 , 33.9 and 34.7 g/L respectively for fermentation of the three samples under the optimum conditions. The sp. carboxy methyl cellulase ( <i style="">CMCase</i>)<i style=""> </i>activity are 1185, 1455 and 1545min⁻¹and maximum sp. <i style="">CMCase </i>activity are 2370, 2910 and 1545min⁻¹using Michaelis-Menten enzyme kinetic model for the fermentation of three samples respectively under optimum conditions. The <i style="">CMCase</i> enzyme kinetic parameters are 34.3, 34.5 and 34.7 g/L for the three samples respectively under optimum fermentation conditions. Fungi <i>Aspergillus oryzae</i> show the better conversion of ethanol than fungi <i style="">Fusarium oxysporum. </i>The fermentation process follows the first order rate equation in CSBR. <br/> <br/>Page(s): 63-70 http://nopr.niscair.res.in/handle/123456789/13504 Title: Selective and validated spectrophotometric methods for determination of ganciclovir with PDAB and Folin’s reagents <br/> <br/>Authors: Kumar, T Anil; Gurupadayya, B M; Reddy, M B Rahul <br/> <br/>Abstract: Two simple, sensitive, selective, accurate and precise methods (Methods A and B) have been developed for the quantitative estimation of ganciclovir in bulk drug and its pharmaceutical formulations. In Method A, presence of amino group in ganciclovir enables the use of condensation reaction with <i style="">p</i>-dimethylamino benzaldehyde, forming the greenish yellow colored complex due to the formation of Schiff’s base. It shows absorption maximum at 401 nm and obeying Beer’s law in the concentration range 80–200 μg mL^-1. Method B is based on the formation of reaction with 1,2-naphtha quinine-4-sulphonic acid sodium salt (Folin’s Reagent), exhibiting absorption maximum at 544 nm and obeying Beer’s law in the concentration range 4–14 μg mL^-1. The results of analysis for both the methods have been validated statistically and by recovery studies. These results have been compared with those obtained by using UV spectrophotometric methods developed in our laboratory. <br/> <br/>Page(s): 56-62 http://nopr.niscair.res.in/handle/123456789/13503 Title: Catechol encapsulated surfactant film modified glassy carbon electrode to detect thiourea at 10^-7 M level <br/> <br/>Authors: Bhattacharjya, Rimki; Das, Diganta Kumar <br/> <br/>Abstract: Glassy carbon electrode surface has been modified with catechol encapsulated in cetyltrimethylammonium bromide (CTAB) or sodium dodecylsulphate (SDS) surfactant film. The modified electrodes show quasi reversible cyclic voltammograms in tris buffer at <i style="">p</i>H 7.0 with redox potential values + 0.250 V and + 0.185 V respectively, using Ag-AgCl (3M NaCl) as reference. Addition of thiourea into the electrolytic medium increases the cathodic and anodic currents of the modified electrodes. Anodic current of CTAB film modified electrode is increased by 18 times while cathodic current increased by 1.8 times. However, SDS film modified electrode shows an increase in anodic current by 5.5 times and that in cathodic current by 8.0 times at 3×10^-7 M concentration of thiourea compared to that at zero thiourea concentration in electrolytic medium. <br/> <br/>Page(s): 52-55 http://nopr.niscair.res.in/handle/123456789/13502 Title: Application of factorial design for adsorption of thallium(III) ion from aqueous solutions by pistachio hull <br/> <br/>Authors: Sheibani, Ali; Zare-Khormizi, Meysam <br/> <br/>Abstract: The removal of thallium cation from aqueous solutions has been studied using pistachio hull as an adsorbent. The effect of variables such as solution <i>p</i>H, contact time and adsorbent amount has been investigated and these are optimized using a factorial design method. A model is developed to relate the content of adsorption to the variables. This model allows the prediction of the extent of adsorption at different conditions. Response surfaces are used for showing the effects of different variables on the content of adsorption. The analysis of variance is used to evaluate the validity of the model. There is no lack of fit found at the confidence level of 95%. The correlation coefficient between the calculated and the experimental data indicates good performance of the model. Under optimum conditions, a maximum removal of 96.5% is achieved. Both the Langmuir and Freundlich adsorption isotherms are found to be suitable for describing the biosorption of thallium ions onto pistachio hull. <br/> <br/>Page(s): 48-51