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Ramesh, S.

Application of Indigenously Developed Remotely Operated Vehicle for the Study of Driving Parameters of Coral Reef Habitat of South Andaman Islands, India

Abstract Views :208 | PDF Views:100

Authors

S. Ramesh ¹, G. A. Ramadass ¹, V. Doss Prakash ¹, C. S. Sandhya ¹, R. Ramesh ¹, D. Sathianarayanan ¹, N. V. Vinithkumar ²

Affiliations
1 National Institute of Ocean Technology (NIOT), Ministry of Earth Sciences, Government of India, Chennai 600 100, IN
2 Andaman and Nicobar Centre for Ocean Science and Technology, NIOT, Port Blair 744 103, IN

Source

Current Science, Vol 113, No 12 (2017), Pagination: 2353-2359

Abstract

Coral reef biodiversity in South Andaman Islands, India was studied using indigenously developed remotely operated underwater vehicle, PROVe. The vehicle was manoeuvred in coral reef habitats using underwater navigational aids to record faunal assemblages along with underwater spatio-temporal spectral irradiance characteristics coupled with surface radiance, water temperature, salinity and underwater visuals by high-definition camera devices. PROVe-based observations and the outcome from scientific payloads indicated that it will be a new additional tool for the Indian scientific community to map coral reef habitats, correlate and validate the satellite-derived parameters to understand coral reef health.

Keywords

Coral Reef, Driving Parameters, Remotely Operated Vehicle, Spectral Irradiance.

Full Text

References

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Photo-thermal Effects on Time to Flowering in Dolichos Bean (Lablab purpureus (L). Sweet) Var. Lignosus

Abstract Views :222 | PDF Views:85

Authors

C. M. Keerthi ¹, S. Ramesh ¹, M. Byregowda ², A. Mohan Rao ¹, G. A. Mary Reena ²

Affiliations
1 Department of Genetics and Plant Breeding, University of Agricultural Sciences, GKVK, Bengaluru 560 065, IN
2 All India Coordinated Research Project on Pigeonpea, Zonal Agricultural Research Station, UAS, Bengaluru 560 065, IN

Source

Current Science, Vol 115, No 7 (2018), Pagination: 1320-1327

Abstract

Prediction of time to flowering of crop plants (especially photoperiod sensitive (PS) ones) help make appropriate crop management decisions such as choosing optimum sowing and harvesting dates which in turn determine plant size and thus affect dry matter production and crop yield. Modelling time to flowering of dolichos bean, a highly PS short-day food legume crop species, indicated greater role of temperature than photoperiod in regulating time to flowering of PS genotypes. The PS and photoperiod insensitive (PIS) genotypes of dolichos bean differed for base (Tb) and optimum temperature requirement for time to flowering. However, they were comparable for critical minimum, maximum and optimum photoperiod requirement for time to flowering. Dolichos bean requires critical minimum, maximum and optimum photoperiods of 11.11, 12.28 and 12.21 h respectively, and critical minimum growing degree days of 372.05°C day-1 and optimum temperature of 23.13°C for time to flowering. Using average daily air temperature, and working backwards in time, it is possible to predict the combination of dolichos bean cultivar and sowing date that will produce ready for harvest crop on a predetermined day when fresh pod quality is optimal.

Keywords

Base Temperature, Critical Photoperiod, Dolichos Bean, Regression Models.

Full Text

References

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Comparison of Traditional Grow-Out Test and DNA-Based PCR Assay to Estimate F1 Hybrid Purity in Cauliflower

Abstract Views :221 | PDF Views:77

Authors

Arpita Pattanaik ¹, D. C. Lakshmana Reddy ², S. Ramesh ³, Aswath Chennareddy ⁴

Affiliations
1 Division of Biotechnology, Centre for Post-Graduate Studies, Jain University, Bengaluru 560 011, IN
2 Division of Biotechnology, Indian Institute of Horticultural Research, Hesaraghatta Lake Post, Hesaraghatta, Bengaluru 560 089, IN
3 Department of Genetics and Plant Breeding, College of Agriculture, University of Agricultural Sciences, GKVK, Bengaluru 560 065, IN
4 Division of Floriculture and Medicinal Crops, Indian Institute of Horticultural Research, Bengaluru 560 089, IN

Source

Current Science, Vol 115, No 11 (2018), Pagination: 2095-2102

Abstract

Cauliflower (Brassica oleracea) is a cool-season crop belonging to the Brassicaceae family. Use of morphological differences between true-to-types and off-types in grow-out test (GOT) is the basic method for hybrid purity analysis. Traditional GOT is costly, tedious, time consuming and environment sensitive. To increase the speed and accuracy of genetic purity testing of hybrids, recent advances in DNA markers have shown promise. In the present study, the purity of cauliflower hybrid (NBH Tania-815) was assessed by traditional GOT and advanced molecular marker systems. The experiment was carried out by mixing 95% F1 hybrids with 5% female parents, individually in the sample sets of 400, 300, 200, 100, 80 and 40. For each sample size, PCR-based assay and GOT were carried out to check the hybrid purity. In the PCR-based assay, 220 pairs of SSR markers were screened, with 32 markers showing parental polymorphism including one codominant marker (BrgMS565). The purity level was determined by the co-dominant marker. A minimum sample size of 100 was standardized to confirm the hybrid purity as it showed the same result with that of higher sample sizes (200, 300 and 400). Hence, it is proposed that molecular marker-based hybrid purity assessment may serve as an effective substitute to traditional GOT.

Keywords

Cauliflower, Grow-Out Test, Hybrid Purity, PCR Assay.

Full Text

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Inheritance of Fruitinghabit Traits in Chilli (Capsicum annuum L.)

Abstract Views :276 | PDF Views:86

Authors

C. Anilkumar ¹, A. Mohan Rao ¹, S. Ramesh ¹, B. Bhavani ¹, Pranesh ¹

Affiliations
1 Department of Genetics and Plant Breeding, College of Agriculture, University of Agricultural Sciences, Gandhi Krishi Vignana Kendra, Bengaluru 560 065, IN

Source

Current Science, Vol 118, No 10 (2020), Pagination: 1598-1602

Abstract

Fruiting habit, viz. fruits node^–1 and fruit orientation are economically important traits in chilli. Fruiting habit could be solitary erect, solitary pendant, clus-tered erect or clustered pendant. Farmers’ preference for fruiting habit traits varies from region to region. An understanding of the inheritance of fruiting habit traits helps accelerate breeding chilli cultivars with farmer-preferred combination of such traits. Eight diverse genotypes contrasting for fruiting habit traits were crossed to develop ten F₁ hybrids of six combina-tions. The F₂ and backcross generations of all the six distinct types of crosses were evaluated and pattern of segregation for fruiting habit traits was recorded. Results indicated bi-allelic, monogenic inheritance of fruits node^–1 (solitary versus clustered) and fruit orientation (pendant versus erect) with solitary being dominant over clustered and pendant being dominant over erect orientation respectively. Genes controlling fruits node^–1 and orientation of fruits segregated inde-pendently. Implications of these results are discussed in relation to strategic and applied chilli breeding.

Keywords

Chilli, Fruiting Habit Traits, Goodness-of-Fit, Inheritance.

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Unmanned Underwater Vehicles: Design Considerations and Outcome of Scientific Expeditions

Abstract Views :252 | PDF Views:84

Authors

G. A. Ramadass ¹, S. Ramesh ¹, N. Vedachalam ¹, A. N. Subramanian ¹, D. Sathianarayanan ¹, R. Ramesh ¹, G. Harikrishnan ¹, T. Chowdhury ¹, V. B. N. Jyothi ¹, S. B. Pranesh ¹, V. Doss Prakash ¹, M. A. Atmanand ¹

Affiliations
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai 600 100, IN

Source

Current Science, Vol 118, No 11 (2020), Pagination: 1681-1686

Abstract

In India, scientific investigations of ocean basins have been in progress for more than five decades using indirect and direct measurement devices. These studies were aimed at resource identification, ecological, palaeo-oceanographic and palaeo-climatic research. To cater to the need of the ocean community, Remotely Operated Vehicles (ROV) rated for 6000 m (ROSUB 6000) and 500 m (PROVe-500) operational depths have been developed at the National Institute of Ocean Technology, MoES, Chennai. This article reports the design considerations for unmanned remotely operated underwater vehicles and the outcome of scientific expeditions conducted for deep sea mineral exploration, ocean biodiversity and polar science.

Keywords

Biodiversity, Ocean Resources, Remotely Operated Vehicle.

Full Text

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Challenges in Developing Deep-Water Human Occupied Vehicles

Abstract Views :267 | PDF Views:151

Authors

G. A. Ramadass ¹, N. Vedachalam ¹, S. Ramesh ¹, D. Sathianarayanan ¹, A. N. Subramanian ¹, R. Ramesh ¹, T. Chowdhury ¹, S. B. Pranesh ¹, M. A. Atmanand ¹

Affiliations
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai 600 100, IN

Source

Current Science, Vol 118, No 11 (2020), Pagination: 1687-1693

Abstract

Human occupied vehicles (HOV) offer enhanced manoeuvering over the remotely operated vehicles and autonomous underwater vehicles. The presence of human increases the dexterity of the HOV operations, but at the same time, the man-rated vehicle design and operation requires significant attention to vehicle reliability, and in turn human safety. This article details the challenges involved in the design and development of deep water HOV, with specific reference to the 6000 m depth-rated HOV designed by the MoES– National Institute of Ocean Technology for enhancing India’s engineering capability in the deep ocean scientific research.

Keywords

Ballast, Batteries, Deep Ocean, Human Occupied Vehicle, Navigation.

Full Text

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Design and Development of Human Metabolic Simulator for a Deepwater Manned Submersible

Abstract Views :184 | PDF Views:94

Authors

C. S. Sandhya ¹, S. Ramesh ¹, N. Thulasi Prasad ¹, K. N. V. V. Murthy ¹, D. Gobichandhru ¹, M. Murugesan ¹, N. Vedachalam ¹, G. A. Ramadass ¹

Affiliations
1 Deep-Sea Technologies Group, National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai 600 100, IN

Source

Current Science, Vol 122, No 2 (2022), Pagination: 187-194

Abstract

In order to cater to the scientific demand for deep ocean exploration with human presence, manned submersible capable of operating up to 6000 m depth is being designed and developed at National Institute of Ocean Technology. The submersible can accommodate three personnel inside the confined space volume of 4.8 m³ human capsule (personnel sphere) for total endurance of 108 h (12 h normal mission and 96 h in case of emergency). Human Metabolic Simulator was developed by following Det Norske Veritas guideline to validate the life support system design during initial stages of qualification inside the personnel sphere. By considering human respiratory quotient (RQ), HMS was designed by combusting propane gas (RQ 0.6) to produce carbon dioxide, water and heat

Keywords

Human Metabolic Simulator, Life Support System, Manned Submersible, Personnel Sphere, Respiratory Quotient.

Full Text

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