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RISS 인기검색어
- 검색키워드
- 저자 : Sunil Kumar Shukla (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Desmids (Chlorophyceae, Conjugales, Desmidiaceae) from Foothills of Western Himalaya, India
Shukla, Sunil Kumar,Shukla, Chandra Prakash,Misra, Pradeep Kumar The Korean Society of Phycology 2008 ALGAE Vol.23 No.1
Forty-eight taxa of desmids belonging to Class Chlorophyceae (Order - Conjugales, Family - Desmidiaceae), collected from different aquatic habitats of Lalkuan, Kathgodam and Pantnagar areas of Uttaranchal state and Pilibheet district of Uttar Pradesh, which are regions of foothills of Western Himalaya, have been described. These taxa belongs to 5 genera viz. Closterium Nitzsch (6 spp., 5 var., and 2 forma), Euastrum Ehrenberg (1 var.), Staurastrum Meyen (2 spp., 1 var., 1 forma), Cosmarium Corda ex Ralfs (19 spp. and 10 var.), Pleurotaenium Naegeli (1 sp.). Staurastrum pseudopachyrhyncum Wolle (1884) is new record for desmid flora of India.
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Desmids (Chlorophyceae, Conjugales, Desmidiaceae) from Foothills of Western Himalaya, India
Sunil Kumar Shukla,Pradeep Kumar Misra,Chandra Prakash Shukla 한국조류학회I 2008 ALGAE Vol.23 No.1
Forty-eight taxa of desmids belonging to Class Chlorophyceae (Order - Conjugales, Family - Desmidiaceae), collected from different aquatic habitats of Lalkuan, Kathgodam and Pantnagar areas of Uttaranchal state and Pilibheet district of Uttar Pradesh, which are regions of foothills of Western Himalaya, have been described. These taxa belongs to 5 genera viz. Closterium Nitzsch (6 spp., 5 var., and 2 forma), Euastrum Ehrenberg (1 var.), Staurastrum Meyen (2 spp., 1 var., 1 forma), Cosmarium Corda ex Ralfs (19 spp. and 10 var.), Pleurotaenium Naegeli (1 sp.). Staurastrum pseudopachyrhyncum Wolle (1884) is new record for desmid flora of India.
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Relative Microalgal Concentration in Prydz Bay, East Antarctica during Late Austral Summer, 2006
Rahul Mohan,Sunil Kumar Shukla,N. Anilkumar,M. Sudhakar,Satya Prakash,R. Ramesh 한국조류학회I 2009 ALGAE Vol.24 No.3
Microalgae using a submersible fluorescence probe in water column (up to 100 m) were measured during the austral summer of 2006 (February) in Prydz Bay, East Antarctica (triangular-shaped embayment in the Indian sector of Southern Ocean). Concurrently, environmental parameters such as temperature, salinity and nitrogen (nitrate, ammonium, urea) uptake rates were measured. The concentration of phytoplankton is relatively high due to availability of high nutrients and low sea surface temperature. Phytoplankton community is dominated by diatoms whereas cryptophytes are in low concentration. The maximum concentration of total chlorophyll is 14.87 μg L-1 and is attributed to upwelled subsurface winter water due to local wind forcing, availability of micro-nutrients and increased attenuation of photosynthetically available radiation (PAR). Concentration of blue-green algae is low compared to that of green algae because of low temperature. Comparatively high concentration of yellow substances is due to the influence of Antarctic melt-water whereas cryptophytes are low due to high salinity and mixed water column. Varied concentrations of phytoplankton at different times of Fluoroprobe measurements suggest that the coastal waters of Prydz Bay are influenced by changing sub-surface water temperature and salinity due to subsurface upwelling induced by local winds as also melting/freezing processes in late summer. The productivity is high in coastal water due to the input of macro as well as micro-nutrients.
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Relative Microalgal Concentration in Prydz Bay, East Antarctica during Late Austral Summer, 2006
Mohan, Rahul,Shukla, Sunil Kumar,Anilkumar, N.,Sudhakar, M.,Prakash, Satya,Ramesh, R. The Korean Society of Phycology 2009 ALGAE Vol.24 No.3
Microalgae using a submersible fluorescence probe in water column (up to 100 m) were measured during the austral summer of 2006 (February) in Prydz Bay, East Antarctica (triangular-shaped embayment in the Indian sector of Southern Ocean). Concurrently, environmental parameters such as temperature, salinity and nitrogen (nitrate, ammonium, urea) uptake rates were measured. The concentration of phytoplankton is relatively high due to availability of high nutrients and low sea surface temperature. Phytoplankton community is dominated by diatoms whereas cryptophytes are in low concentration. The maximum concentration of total chlorophyll is 14.87 ${\mu}g\;L^{-1}$ and is attributed to upwelled subsurface winter water due to local wind forcing, availability of micro-nutrients and increased attenuation of photosynthetically available radiation (PAR). Concentration of blue-green algae is low compared to that of green algae because of low temperature. Comparatively high concentration of yellow substances is due to the influence of Antarctic melt-water whereas cryptophytes are low due to high salinity and mixed water column. Varied concentrations of phytoplankton at different times of Fluoroprobe measurements suggest that the coastal waters of Prydz Bay are influenced by changing sub-surface water temperature and salinity due to subsurface upwelling induced by local winds as also melting/freezing processes in late summer. The productivity is high in coastal water due to the input of macro as well as micro-nutrients.
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Harish Jagat Pant,Sunil Goswami,Sunil B. Chafle,Vijay Kumar Sharma,Vimal Kotak,Vikram Shukla,Amitanshu Mishra,Nilesh C. Gohel,Sujay Bhattacharya 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.4
A radiotracer investigation was carried out in a Thermal Stratification Test Facility (TSTF) with objectivesof investigating the dispersion and diffusion of radionuclide and effectiveness of the thermocline tominimize the radionuclide content in the hot water layer. Technetium-99m (99mTc) as sodium pertechnetate was used as a radiotracer in the investigation. Qualitative analysis showed that a thermoclineis formed within the TSTF and is effective in preventing the transport of radionuclide from bottomsection to the top section of the facility. It was found that the radiotracer injected at the bottom of thepool took about 17.4 h to disperse from bottom to the top of the facility. The results of the investigationhelped in understanding the effectiveness of hot water layer and thus to minimize the pool top radiationlevels.
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