ID: 58008
Title: Biodiversity of endophytic fungi in Kigelia pinnata during two different seasons
Author: S Maheswari and K Rajagopal
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: Bark and leaf tissue, endophytic fungi, Kigelia pinnata
Abstract: Endophytic fungi of inner bark and leaf tissue of Kigelia pinnata (Lam) Benth., also called sausage tree, from South India, have been studied during two different seasons. Four hundred bark and leaf segments were analysed aand a total of 732 isolates representing 28 taxa, including 3 morphotypes were isolated. The endophytic fungal population is prevalent during winter on both the tissues and the colonization frequency and isolateion frequency were greater in the leaves than bark tissue. Some endophytic fungi were common to both hosts, although more appeared to be tissue-specific.
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None
ID: 58007
Title: Effect of phenytoin on development and life-history traits of Drosophila melanogaster
Author: D S Gayathri and B P Harini
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: Drosophila melanogaster, life-history traits, Phenytoin, developmental toxicity
Abstract: Phenytoin is an antiepileptic drug which has been used in the present study to assess its effect on developmental toxicity from egg to adult eclosion and also life-history traits in Drosophila melanogaster. Flies were reared on media supplemented with different doses of phenytoin. The dose-dependent developmental delay, reduced pupla and adult size reduced adult ecolosions, minimum larval, adult mortality, but significant pupal mortality was observed with incomplete pupal ecolosion. The data show reduction in fecundity for life-history traits, but differences are not statistically significant for fertility and lifespan. The present study reveals that on exposure to phenytoin pre-adult stages are prone to developmental toxicity than the treated adult.
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None
ID: 58006
Title: Analysis of remote sensing and aeromagnetic data for identificationof the causative factors for the recetn micro-seismicity observed in Vanasthalipuram area of Ranga Reddy district, Andhra Pradesh, India
Author: P Chandrasekhar and K Seshadri
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: Aeromagnetic data, hydro-loading, microseismicity, water table
Abstract: Geological and magnetic features were interpreted using IRS-P6 (LISS-III) and aeromagnetic data respectively. Historical rainfall data and the water-table fluctuations were also anlaysed and integrated with the above in conjunction with ground truth information. It is observed that the intrusion activity of the dykes had disturbed the fracture network, resulting in filling up of pore spaces in the weathered columns. Lineaments across the dykes, the associated pediment and the weathered pediplain have more porosity and permeability. The accumulation and rising of groundwater flow is influenced by the above structural set-up. It is concluded that significant amount of base flow had resulted in hydro-loading and was responsible for the micro-seismicity.
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None
ID: 58005
Title: Initial results using RISAT-1 C-band SAR data
Author: Manab Chakraborty, Sushma Panigrahy, A S Rajawat, Raj Kumar, T V R Murthy, Dipanwita Haldar, Abhisek Chakraborty, Tanumi Kumar, Sneha Rode, Hrishikesh Kumar, Manik Mahapatra and Sanchayita Kundu
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: Mangrove ecosystem, ocean surface wind, rice acreage, RISAT-1, ship detection, Synthetic Aperture Radar, wave spectra
Abstract: Imaging radars provide information that is fundamentally different from sensors that operate in the visible and infrared portions of the electromagnetic spectrum. The Indian Space Research Organisation (ISRO) has launched a multi-mode, multi-polarization Synthetic Aperture Radar (SAR) on-board Radar Imaging SATellite-1 (RISAT-1) on 26 April 2012. Various data products from RISAT-1 SAR are now going through calibration-validation (cal-bal) phase and soon will be available for the global users for operational and research purposes. In this regard, algorithms are being developed to retrieve varius parameters in diverse application area. This article deals with the in-house algorithm development for studying different resources using initial available data of RISAT-1.
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None
ID: 58004
Title: Ground segment for RISAT- 1 SAR mission
Author: V Mahadevan, T V S R K Prasad, D S Jain, Santanu Chowdhury, M Pitchamani and N M Desai
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: Mission operations, offline data processing and dissemination, quick look processing, synthetic Aperture Radar
Abstract: RISAT-1 carries a C-band multi-mode Synthetic Aperture Radar (SAR) operating in Stripmap, Scan-SAR and Sliding Spotlight modes and mainly caters to civilian land applications related to agriculture, forestry and disaster management. Considering the multi-resolution and multi-polarization requriements of RISAT-1 SAR, on-board programmability and flexibility in SAR payload as well as fairly autonomous operation have been major mission requirements. The necessary intelligence and sophistication have been built into the on-board SAR subsystems to fulfill these essential requirements, apart from intelligent control and coordination of active antenna of RISAT-1 SAR payload.
The complexity and large size of on-board SAR instrument have demanded a matching and equally innovative approach for ground segment operations for RISAT-1 mission. Since the launch of RISAT-1 satellite by PSLV-C19 flight on 26 April 2012, the satellite and SAR payload performances as well as mission and ground segment operations have been found to be nominal and satisfactory. This article highlights the features and achievements of various RISAT-1 ground segment systems and the activities carried out during pre-launch, lauch and Early Orbit Phase and normal operating phases of RISAT-1 SAR mission, data reception chain, quick look processing, offline data product generation and dissemination chains.
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None
ID: 58003
Title: PSLV-C19/RISAT-1 mission: the launcher aspects
Author: P Kunhikrishnan, L Sowmianarayanan and M Vishnu Nampoothiri
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: Launch vehicle, orbit planning, satellite, techno-managerial challenges
Abstract: India ' s Polar Satellite Launch Vehicle (PSLV) precisely placed the indigenous Radar Imaging Satellite (RISAT-1) in the intended orbit successfully on 26 April 2012. This marked the 20th successive success of the alucher. This article gives the special aspects of the ' PSLV-C19/RISAT-1 mission ' from the techno-managerial perspectively of launch vehicle project. Also given is a summary of the performance of the launch vehicle in this flight.
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None
ID: 58002
Title: RISAT-1 spacecraft configuration: architecture, technology and performances
Author: N Valarmathi, R N Tyagi, S M Kamath, B Trinatha Reddy, M VenkataRamana, V V Srinivasan, Chayan Dutta, N Veena, K Venketesh, G N Raveendranath, G Ravi Chandra Babu, K Sreenivasa Prasad, Rajeev R Badagandi, P Natarajan, S Sudhakar, J Subhalakshmi, Sree
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: Architecture and design, radar imaging satellite, synthetic radar payload
Abstract: RISAT-1 is the first indigenous active Radar Imaging Satellite launched by Polar Satellite Launch Vehicle (PSLV) in April 2012 from Sriharikota. It carriesC-band Synthetic Aperture Radar (SAR) payload which can operate at various values of resolution and swath for various applications. RISAT-1 is the heaviest and high-power satellite with many new technologies to support the SAR payload and the associated elements RISAT-1 operates at polar sun-synchronous orbit of 536 km altitude with the inclination of 97.5540 and it is designed for 5 years lifetime. Performance of the spacecraft system and the SAR payload is satisfactory. This article outlines the architecture, design and on-orbit performance of RISAT-1.
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None
ID: 58001
Title: Synthetic aperture radar payload on -board RISAT-1: configuration, technolgoy and performance.
Author: Tapan Misra, S S Rana, N M Desai, D B Dave, Rajeevjyoti, R K Arora, C V N Rao, B V Bakori, R Neelakantan and J G Vachchani
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: C-band, near field antenna facility, radar imaging satellite, stripmap mode, scanSAR mode, synthetic Aperture Radar, transmit-receive module
Abstract: The launch of Radar Imaging system (RISAT-1) marked a new chapter in the remote sensing programme of Indian Space Research ORganisation (ISRO). RISAT-1, carrying a multi-mode Synthetic Aperture Radar (SAR) system, will provide complementary imaging capability in microwave along with optical images, being obtained from the well-established IRS class of satellites. RISAT-1 supports a variety of resolution and swath requirements. Both conventional stripmap and scanSAR modes are supported, with dual polarization mode of operation. Additionally a quad polarization stripmap mode is provided for availing additional resource classification. In all these modes, resolutions from 3 to 50 m can be achieved with swath ranging from 25 to 223 km. On experimental basis, a sliding spotlight mode is also available. In all the imaging modes, a novel polarimetry mode called circular or hybrid polarimetry can be exercised seamlessly. The system is capable of imaging on either side of the flight track depending upon prior programming of the satellite. The satellite is placed in a Sun-synchronous orbit with 6 am-6 pm equatorial crossing. This orbit configuration is chosen to maximize solar power availability. The satellite has an on-board-solid state recorder for supporting data acquisition beyond ground station visibility. The payload is based on active antenna array technology. Crucial technology elements like C-band MMICs, TR module and miniaturized power supplies have already been developed in India. A pulsed mode near-field test facility has also been developed in-house in order to characterize the payload in the integration laboratory itself.
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None
ID: 58000
Title: Non-timber forest products as a source of livelihood option for forest dwellers: role of society, herbal industries and government agencies
Author: T Sudhakar Johnson, R K Agarwal and Amit Agarwal
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: Forest dwellers, livelihood, non-timber forest produce, rural economy
Abstract: Non-timber forest product (NTFPs) have attracted considerable, global attention due to the significant role played in benefiting people and industries. It is a well-established fact that most tribals and billagers who live in forest regions depend on NTFPs as the source of their livelihood. In this context, we present here the role of stakholders, viz. industry, society and government agencies in ensuring the livelihood options of NTFPs gatherers.
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None
ID: 57999
Title: Puffer fish menace in Kerala: a case of decline in predatory control in the southeastern Arabian sea
Author: K S Mohamed, T V Sathianandan, V Kripa, P U Zacharia
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: None
Abstract: None
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None
ID: 57998
Title: Dual mode of anthesis in male plants of sea buckthron
Author: Amjad Ali, Veenu Kaul
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: None
Abstract: None
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None
ID: 57997
Title: Petrographic evidence as an indicator of volcanic forest fire from the Triassic of Allan hills, South Victoria Land, Antartica
Author: Kamlesh Kumar, Sankar Chatterjee, Rajni Tewari, Naresh C Mehrotra, Gaurav Kumar Singh
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: None
Abstract: None
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None
ID: 57996
Title: Floodplains: Self-recharging and self-sustaining aquifers for city water
Author: Vikram Soni, Diwan Singh
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: None
Abstract: None
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None
ID: 57995
Title: Mountain tunnelling, aquifer and tectonics-a case study of Gran Sasso and its implications for the India-based Neutrino observatory
Author: V T Padmanabhan and Joseph Makkolil
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: hydroseismicity, aquifer, reservoirs
Abstract: The India-based Neutrino Observatory Collaboration is about to construct an underground laboratory in the Western Ghats within the Idukki-Theni charnockyte aquifer. There are several dams quite close to the structure and the area is prone to hydroseismicity. No geotechnical study has been conducted for this project. A similar observatory in Gran Sasso, Italy, built three decades ago has caused floods and severely impacted the aquifer, leading to a series of tremors and a major earthquake in 2009. The long-term impacts of the project on the aquifer and the reservoirs should be examined before going ahead with the construction.
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None
ID: 57994
Title: Plant invasion researches in India: how long do we have to wait for appropriate management options?
Author: Ankita Pandey, Gyan P Sharma
Editor: P Balaram
Year: 2013
Publisher: Current Science Association, Vol 104, No 4, 25 February 2013
Source: Centre for Ecological Sciences
Reference: None
Subject: Current Science
Keywords: None
Abstract: None
Location: TE15, New Biological Sciences, IISc
Literature cited 1: None
Literature cited 2: None