Implementing and Characterizing Real-time Broadband RFI Excision for the GMRT Wideband Backend

The Giant Metrewave Radio Telescope (GMRT) is being upgraded to increase the receiver sensitivity. This makes the receiver more susceptible to man-made Radio Frequency Interference (RFI). To improve the receiver performance in presence of RFI, real-time RFI excision (filtering) is incorporated in the GMRT wideband backend (GWB). The RFI filtering system is implemented on FPGA and CPU-GPU platforms to detect and remove broadband and narrowband RFI. The RFI is detected using a threshold-based technique where the threshold is computed using Median Absolute Deviation (MAD) estimator. The filtering is carried out by replacing the RFI samples by either noise samples or constant value or threshold. This paper describes the status of the real-time broadband RFI excision system in the wideband receiver chain of the upgraded GMRT (uGMRT). The test methodology for carrying out various tests to demonstrate the performance of broadband RFI excision at the system level and on radio astronomical imaging experiments are also described.Comment: 7 pages, 7 figure

Rice area mapping in Palakkad district of Kerala using Sentinel-2 data and Geographic information system technique

Proper calculation of rice cultivation area well before harvest is critical for projecting rice yields and developing policies to assure food security. This research looks at how Remote Sensing (RS) and Geographic Information System (GIS) can be used to map rice fields in Palakkad district of Kerala. The area was delineated using three multi-temporal cloud free Sentinel-2 data with 10 m spatial resolution, matching to crop's reproductive stage during mundakan season (September-October to December-January), 2020-21. To make classification easier, the administrative boundary of district was placed over the mosaicked image. The rice acreage estimation and land use classification of the major rice tract of Palakkad district comprising five blocks was done using Iterative Self-Organisation Data Analysis Technique (ISODATA) unsupervised classification provision in ArcGIS 10.1 software, employing False Colour Composite (FCC) including Blue (B2), Green (B3), Red (B4) and Near-infrared (B8) Bands of Sentinel-2 images. The classification accuracy was determined by locating a total of 60 validation points throughout the district, comprising 30 rice and 30 non-rice points. The total estimated area was 24742.76 ha, with an average accuracy of 88.33% and kappa coefficient 0.766 in five blocks of Palakkad district. The information generated will be helpful in assessing the anticipated production as well as the water demand of the rice fields

Influence of shade regimes on yield and quality of ginger (Zingiber officinale Rosc.)

The effect of different levels of shade on yield and quality of ginger (Zingiber officinale Rosc.) was studied during two seasons at Coconut Research Station, Thiruvananthapuram, Kerala Agricultural University, Kerala. The shade levels 20 and 40 per cent were favourable for obtaining higher dry ginger yield. Volatile oil content showed an increasing trend with increasing levels of shade. Maximum NVEE was recorded in the plants grown under 20 and 40 per cent shade levels. Higher starch content was observed in plants grown under 20 per cent shade level. Crude fibre content gradually reduced as the intensity of shade increased. The results indicate the possibility of utilizing existing shaded situations in coconut gardens and under other perennial crops for the production of ginger. &nbsp

ExoMars Schiaparelli Direct-to-Earth Observation using GMRT

During the ExoMars Schiaparelli separation event on 16 October 2016 and Entry, Descent, and Landing (EDL) events 3 days later, the Giant Metrewave Radio Telescope (GMRT) near Pune, India, was used to directly observe UHF transmissions from the Schiaparelli lander as they arrive at Earth. The Doppler shift of the carrier frequency was measured and used as a diagnostic to identify key events during EDL. This signal detection at GMRT was the only real‐time aliveness indicator to European Space Agency mission operations during the critical EDL stage of the mission

ExoMars Schiaparelli Direct-to-Earth Observation using GMRT

During the ExoMars Schiaparelli separation event on 16 October 2016 and Entry, Descent, and Landing (EDL) events 3 days later, the Giant Metrewave Radio Telescope (GMRT) near Pune, India, was used to directly observe UHF transmissions from the Schiaparelli lander as they arrive at Earth. The Doppler shift of the carrier frequency was measured and used as a diagnostic to identify key events during EDL. This signal detection at GMRT was the only real‐time aliveness indicator to European Space Agency mission operations during the critical EDL stage of the mission

An endophyte Paenibacillus dendritiformis strain APL3 promotes Amaranthus polygonoides L. sprout growth and their extract inhibits food-borne pathogens

Green leafy vegetables are rich sources of antioxidants and minerals, which prevent food-borne pathogen infections during our diet. This study was aimed to isolate and identify the plant growth-promoting endophytic bacterium from several plant species to enhance the growth of Amaranthus polygonoides L. and their antimicrobial potential against food-borne pathogens. Seven endophytic bacterial isolates were tested on two Amaranthus species to identify the suitable beneficial bacterium. The antioxidants capacity and antimicrobial activity of bacterial isolate (APL3) treated plants were analyzed. The bacterial isolate, APL3 showed a significantly higher growth of A. polygonoides L. than other isolates. It was identified as Paenibacillus dendritiformis strain APL3 by 16S rRNA gene sequencing and phylogenetic analysis. The endophyte (APL3) treated A. polygonoides L. sprouts had higher antioxidants potentials and significantly inhibited the growth of Escherichia coli, Salmonella sp., Staphylococcus sp. and Pseudomonas sp. The results of the present study suggest that utilization of P. dendritiformis strain APL3 triggers the growth of A. polygonoides L. and induces metabolic changes in plants to improve their antimicrobial properties to prevent foodborne pathogens

Assessment of oxidative stress and antioxidant status in cattle infected with Theileria orientalis

Oriental theileriosis is a major haemoprotozoan disease of cattle and causes huge economic losses to the farmers. Oxidative stress plays an important role in the development of anaemia and subsequent complications associated with theileriosis. The present study was conducted to assess oxidative stress and antioxidant status of cattle infected with Theileria orientalis. In the present study, 16 animals which were positive for theileriosis by blood smear examination were selected. Confirmation of oriental theileriosis was done with polymerase chain reaction (PCR). Assessment of oxidative stress and antioxidant status were done by measuring malondialdehyde (MDA) levels and reduced glutathione activity respectively. Both MDA levels and reduced glutathione activity did not indicate any significant difference in animals infected with T. orientalis from control animals

A prospective study on haematobiochemical aspects of atopic dermatitis in dogs

A prospective study on haemato-biochemical aspects of canine atopic dermatitis was conducted in the Department of Clinical Veterinary Medicine, College of Veterinary and Animal Sciences, Mannuthy during the period from 2019 to 2021. Sixteen dogs diagnosed with atopic dermatitis using characteristic clinical (Favrot’s) criteria with exclusion of other pruritic skin diseases, together with elevated Ig E levels and ten healthy animals formed the subjects for the present study. Whole blood samples were collected from atopic and healthy controls and haematobiochemical parameters were estimated. Haemato-biochemical studies of atopic dogs revealed anaemia with leukocytosis, neutrophilia and eosinophilia and hypoalbuminaemia with reduced AG ratio. Absolute eosinophil count that was found positively correlated with neutrophil to lymphocyte ratio (NLR) in atopic dogs, is of diagnostic significance in quantifying inflammatory response which helps in instituting customized treatment to atopic animals in clinical practice. Hypoalbuminaemia observed in atopic animals in the present study indicates the need for nutrient supplementation in the therapeutic protocol of the disease

Occurrence of allergic dermatitis in dogs with special reference to canine atopic dermatitis in Kerala

Allergic dermatitis is an inflammatory skin disease manifested as itchy skin rashes, caused as a result of hypersensitivity reactions elicited in the body due to exposure to various allergens. Canine atopic dermatitis (CAD) is a widespread skin condition characterized by an inherited propensity to develop pruritic inflammatory skin disease linked to IgE antibodies, which usually target environmental allergens. The study was conducted on 245 cases of allergic dermatitis in dogs presented to the small animal dermatology unit during the period from 2019 to 2021. Out of the total 2,032 dermatological cases in dogs presented to the clinics from different parts of Kerala, 245 cases were diagnosed as various allergies over a period of three years, and out of which, 63 cases were recorded as canine atopic dermatitis (CAD). All the 63 cases diagnosed as CAD were utilized for age-wise, gender-wise and breed-wise occurrence of disease. The occurrence of allergic dermatitis in the present study was recorded as 13 per cent. The highest occurrence rate recorded was that of flea allergy followed by atopic dermatitis, contact allergy dermatitis and food allergy. In the current study, higher incidence (66.7 per cent) of atopic dermatitis was found in dogs below 3 years of age, followed by dogs older than 5 years and of the age group >3 to 5 years. Gender-wise occurrence of atopic dermatitis revealed a male predominance with a sex ratio of 1.74: 1 in the present study. Labrador breed of dogs were more prone to atopic dermatitis followed by Beagle, Pomeranian, Shih Tzu, Pug, Pit bull, German Shepherd dog, Dachshund, Rottweiler and Golden Retriever

Imaging response assessment for CNS germ cell tumours: consensus recommendations from the European Society for Paediatric Oncology Brain Tumour Group and North American Children's Oncology Group

Homogeneous and common objective disease assessments and standardised response criteria are important for better international clinical trials for CNS germ cell tumours. Currently, European protocols differ from those of North America (the USA and Canada) in terms of criteria to assess radiological disease response. An international working group of the European Society for Paediatric Oncology Brain Tumour Group and North American Children's Oncology Group was therefore established to review existing literature and current practices, identify major challenges regarding imaging assessment, and develop consensus recommendations for imaging response assessment for patients with CNS germ cell tumours. New clinical imaging standards were defined for the most common sites of CNS germ cell tumour and for the definition of locoregional extension. These new standards will allow the evaluation of response to therapy in patients with CNS germ cell tumours to be more consistent, and facilitate direct comparison of treatment outcomes across international studies