Jawaharlal Nehru University

About: Jawaharlal Nehru University is a education organization based out in New Delhi, India. It is known for research contribution in the topics: Population & Politics. The organization has 6082 authors who have published 13455 publications receiving 245407 citations. The organization is also known as: JNU.

Mapping spatial distribution of pollutants in groundwater of a tropical area of India using remote sensing and GIS

Abstract: Fresh and clean water is a vital commodity of need for the well-being of human societies, and damage of these aquifers is one of the most serious environmental problems of the past century. The regular monitoring and management of groundwater resources is very important for the sustainable development. The present study monitors the groundwater quality relation to the land use/land cover (LULC) using remote sensing and GIS techniques. Physico-chemical analysis data of groundwater samples collected at different locations forms the attribute database for the study. LULC categories, such as agricultural and built-up area, associated with human activities, incorporated maximum change in groundwater quality. In this study, weighting analysis of Water Quality Index (WQI) and Land Cover Index (LCI) have been performed to map the Suitability Index (SI) of water for drinking purpose in the area. Spatial interpolation technique was used for generation of pollution potentiality map of the area. Cluster analysis was performed for delineating and grouping the similar pollution causing area. The overall view of the results indicates that most of the study area exhibited very low SI for the drinking purpose due to very high groundwater pollution.

Identification of polymorphic mutant alleles of CaMDR1, a major facilitator of Candida albicans which confers multidrug resistance, and its in vitro transcriptional activation.

Abstract: CaMDR1 (Candida albicans Multi Drug Resistance) encodes a major facilitator whose expression in Saccharomyces cerevisiae confers resistance to several unrelated drugs. We describe here the identification and molecular characterization of seven mutant alleles of CaMDR1 (CaMDR1-1 to 1-7). The complete sequencing of CaMDR1 alleles revealed several in-frame point mutations leading to a change in amino-acid residues where insertion/replacement of an aspartate residue in a serine-asparagine-aspartate-rich domain was most noteworthy. Interestingly, these alleles showed a distinct drug resistance profile. The expression of CaMDR1, or of its alleles, in C. albicans cells was enhanced by benomyl, methotrexate and several other unrelated drugs, and was more pronounced in at least one of the azole-resistant clinical isolates.

Mutual coupling reduction between elements of UWB MIMO antenna using small size uniplanar EBG exhibiting multiple stop bands

Abstract: In this paper, mutual coupling reduction between elements of UWB MIMO antenna using small size uniplanar EBG is presented. Proposed UWB antenna geometry consists of two circular shaped monopole radiator swith a slot in ground plane for proper impedance matching. A UC-EBG (Uniplanar Electromagnetic Band Gap) cell of size 6.8 mm × 6.8 mm is inserted between the antenna elements in 4 × 1 array configuration to improve the isolation. Bandgap of the UCEBG is determined using dispersion diagram and suspended stripline method. The proposed antenna is fabricated on 1.6 mm thick, low cost FR4 substrate, possessing an overall size of 27.2 mm × 46 mm. The antenna has been fabricated and experimentally verified. The antenna shows simulated and measured −10 dB impedance bandwidths of 14.6 GHz (3–17.6 GHz) and14.8 GHz (3.6–17.9 GHz) respectively. UCEBG structure exhibits multiple stop bands and suppresses E-plane coupling over these bands. Isolation better than −18 dB is achieved over the complete impedance bandwidth. Radiation efficiency and peak gain of the antenna varies from 78% to 96.7% and 1.4 dB to 4 dB respectively. MIMO parameters, i.e. error correlation coefficient (ECC) better than0.018 and Total active reflection coefficient (TARC) better than −26 dB is achieved over the impedance bandwidth.