Hydro- Chemical Evolution of Palk Strait Region, Bay of Bengal

Present analysis was carried out the physico- chemical parameters of two stations such as Thondi and Soliyakudi in the southeast Palk Strait region during the monsoon and post monsoon seasons (November 2008 – March 2009). High temperature (31˚C) and salinity (35%o) was recorded in the month of March (post monsoon). Dissolved oxygen content was high (5.2 O2 mg. l-1) during in the monsoonal season. Compared with other nutrients such as NO3, NO2 and SiO2, the total phosphorous concentration was high in both the stations during monsoonal season. In general concentrations of all the nutrients were high in the station I during monsoon season (November and December) which could be due to the addition of nutrients through the sewage, agricultural and land run off

Isolation and identification of few fatty acid esters from the aerial roots of Rhaphidophora aurea twined over different host trees

Plants are the store houses of various secondary metabolites and bio-essential natural products. Several therapeutic agents are isolated from Rhaphidophora aurea. The aerial roots of the mentioned plant twined over different trees were explored. Sequential extraction (Polar to non-polar solvents) was carried out for the aerial roots of Rhaphidophora aurea twined over different host trees. Each extract was subjected to solvent-solvent fractionation. Through Thin-layer chromatography and column chromatography, the fatty acid compounds were identified and isolated. The isolated compounds were characterized through recording UV, IR, GC-MS/MS (Thermo), and 1D and 2D NMR techniques. Six fatty acids viz. 4-oxo-tricosanoic acid icosyl ester, butyl octadecanoate, dodecanoic acid dodec-3-enyl ester, octacosa-23, 26-dien-12-one, ethyl cis-6-octadecenoate and 15,18- dotriacontadienoic acid and methyl ester was isolated and characterized by analytical characterization techniques

Antimicrobial activity of Acanthus ilicifolius: Skin infection pathogens

Objective: To investigate the antimicrobial activity of Acanthus ilicifolius against the skin infecting bacterial and fungal pathogens. Through the literature survey, the mangrove plant Acanthus ilicifolius was used in skin infection diseases and have potential anti-inflammatory activity. Methods: Antimicrobial activity of the leaf extracts was tested using agar well diffusion method. Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were carried out. Results: Among the different extracts, chloroform extract showed maximum activity against the bacterial pathogens methicillin-resistant Staphylococcus aureus, Streptococcus pyogenes, Pseudomonas aeruginosa, Candida albicans and Trichophyton rubrum. Methanol and acetone extracts showed maximum activity against Staphylococcus epidermis and Lactobacillus plantarum respectively. Chloroform extracts showed the lowest MIC (0.5 mg/mL) and MBC (2 mg/ mL) values against the skin pathogens compared with other extracts. Phytochemical screening revealed the presence of resins, steroids, tannins, glycosides, sugars, carbohydrates, saponins, sterols, terpenoids, phenol, alkaloids, cardiac glycosides and catechol. Conclusions: Further, the separation of potential compounds from the crude extracts will be useful for control the skin infection pathogens

Low power CMOS based Self Controlled Precharge Free Content Addressable Memory with Minimum area for Image Processing Devices

Image processing devices plays a vital role in several applications like medical, security, biometric etc. The devices ranges from portable size to larger machines with and without Human Computer Interface possibilities. As the image processing and human computer interface system application requires higher memory requirements, the power and area should be small. Searching of data is a high priority work in image classification. To perform high speed search through hardware Content Addressable Memory is used. But the circuit suffers from higher power consumption, precharging issues and low performance. For longer word length the elimination of precharge is needed. So for high speed applications self-controlled precharge-free CAM (SCPF-CAM) is suitable. A 4T hybrid self controlled pre charge free Content Addressable Memory is proposed in this paper using CMOS 32nm technology. The observation shows that the circuit works at high speed, minimizes the search time and has high performance operation. When compared to the conventional SCPF-CAM, 8T CAM the proposed design reduces the number of transistors. The reduction in area is about approximately 20% and can be used in low power and low energy applications. In Synopsis HSPICE Predictive technology models were used for the implementation in 32nm CMOS technology. The work will be extended in future using FinFET technology where the leakage current can be minimized.</jats:p

Isolation and identification of few fatty acid esters from the aerial roots of Rhaphidophora aurea twined over different host trees

234-243Plants are the store houses of various secondary metabolites and bio-essential natural products. Several therapeutic agents are isolated from Rhaphidophora aurea. The aerial roots of the mentioned plant twined over different trees were explored. Sequential extraction (Polar to non-polar solvents) was carried out for the aerial roots of Rhaphidophora aurea twined over different host trees. Each extract was subjected to solvent-solvent fractionation. Through Thin-layer chromatography and column chromatography, the fatty acid compounds were identified and isolated. The isolated compounds were characterized through recording UV, IR, GC-MS/MS (Thermo), and 1D and 2D NMR techniques. Six fatty acids viz. 4-oxo-tricosanoic acid icosyl ester, butyl octadecanoate, dodecanoic acid dodec-3-enyl ester, octacosa-23, 26-dien-12-one, ethyl cis-6-octadecenoate and 15,18- dotriacontadienoic acid and methyl ester was isolated and characterized by analytical characterization techniques