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The world’s oceans are a major sink for atmospheric carbon dioxide (CO2). The biological carbon pump plays a vital role in the net transfer of CO2 from the atmosphere to the oceans and then to the sediments, subsequently maintaining atmospheric CO2 at significantly lower levels than would be the case if it did not exist. The efficiency of the biological pump is a function of phytoplankton physiology and community structure, which are in turn governed by the physical and chemical conditions of the ocean. However, only a few studies have focused on the importance of phytoplankton community structure to the biological pump. Because global change is expected to influence carbon and nutrient availability, temperature and light (via stratification), an improved understanding of how phytoplankton community size structure will respond in the future is required to gain insight into the biological pump and the ability of the ocean to act as a long-term sink for atmospheric CO2. This review article aims to explore the potential impacts of predicted changes in global temperature and the carbonate system on phytoplankton cell size, species and elemental composition, so as to shed light on the ability of the biological pump to sequester carbon in the future ocean.
Samarpita Basu; Katherine Mackey. Phytoplankton as Key Mediators of the Biological Carbon Pump: Their Responses to a Changing Climate. Sustainability 2018, 10, 869 .
AMA StyleSamarpita Basu, Katherine Mackey. Phytoplankton as Key Mediators of the Biological Carbon Pump: Their Responses to a Changing Climate. Sustainability. 2018; 10 (3):869.
Chicago/Turabian StyleSamarpita Basu; Katherine Mackey. 2018. "Phytoplankton as Key Mediators of the Biological Carbon Pump: Their Responses to a Changing Climate." Sustainability 10, no. 3: 869.
The present study deals with optimization of operational parameters to maximize the CO2 utilization efficiency by microalga: Scenedesmus obliquus SA1 (KC733762) previously isolated in our laboratory. SA1 strain was cultivated in a cylindrical glass photobioreactor under 15% CO2 concentration at various operational conditions. At a light intensity of 4351 lx, a CO2 sparging duration of 12 h per day and flow rate of 0.43 L per hour, a maximum biomass concentration of 3.32 ± 0.022 g L− 1, a maximum specific growth rate of 1.24 ± 0.028 d− 1, and a maximum CO2 utilization efficiency of 10.23% were obtained, which were higher than most of the relevant literature reports. Total inorganic carbon and total organic carbon concentrations of the cultivation medium were monitored with time, which showed increasing trends with an increase in biomass concentration.
Samarpita Basu; Abhijit Sarma Roy; Aloke K. Ghoshal; Kaustubha Mohanty. Operational strategies for maximizing CO2 utilization efficiency by the novel microalga Scenedesmus obliquus SA1 cultivated in lab scale photobioreactor. Algal Research 2015, 12, 249 -257.
AMA StyleSamarpita Basu, Abhijit Sarma Roy, Aloke K. Ghoshal, Kaustubha Mohanty. Operational strategies for maximizing CO2 utilization efficiency by the novel microalga Scenedesmus obliquus SA1 cultivated in lab scale photobioreactor. Algal Research. 2015; 12 ():249-257.
Chicago/Turabian StyleSamarpita Basu; Abhijit Sarma Roy; Aloke K. Ghoshal; Kaustubha Mohanty. 2015. "Operational strategies for maximizing CO2 utilization efficiency by the novel microalga Scenedesmus obliquus SA1 cultivated in lab scale photobioreactor." Algal Research 12, no. : 249-257.
The present study deals with the large scale open system cultivation of the novel microalga: Scenedesmus obliquus SA1 (KC733762) previously isolated in our laboratory. SA1 strain was cultivated in open system at varying CO2 levels ranging from 0.03% to 35% (v/v) and subsequently the carbonic anhydrase activity (CA) and the biochemical properties were monitored. Maximum biomass concentration (1.39 ± 0.023 g L(-1)), CO2 fixation rate (97.65 ± 1.03 mg L(-1)d(-1)) and total CA activity (166.86 ± 3.30 E.U./mg chla) were obtained at 35% CO2. CA inhibitors: acetazolamide and ethoxyzolamide inhibited the external and internal enzyme activity in SA1. High CO2 levels were favorable for the accumulation of lipids and chlorophyll. The present results suggested that SA1 possessed high CO2 tolerance and high carbohydrate, lipid and chlorophyll content when cultivated in open system thus being suitable for CO2 mitigation in outdoor ponds and subsequent generation of value added products.
Samarpita Basu; Abhijit Sarma Roy; Kaustubha Mohanty; Aloke K. Ghoshal. CO2 biofixation and carbonic anhydrase activity in Scenedesmus obliquus SA1 cultivated in large scale open system. Bioresource Technology 2014, 164, 323 -330.
AMA StyleSamarpita Basu, Abhijit Sarma Roy, Kaustubha Mohanty, Aloke K. Ghoshal. CO2 biofixation and carbonic anhydrase activity in Scenedesmus obliquus SA1 cultivated in large scale open system. Bioresource Technology. 2014; 164 ():323-330.
Chicago/Turabian StyleSamarpita Basu; Abhijit Sarma Roy; Kaustubha Mohanty; Aloke K. Ghoshal. 2014. "CO2 biofixation and carbonic anhydrase activity in Scenedesmus obliquus SA1 cultivated in large scale open system." Bioresource Technology 164, no. : 323-330.
The present study aimed to isolate a high CO2 and temperature tolerant microalga capable of sequestering CO2 from flue gas. Microalga strain SA1 was isolated from a freshwater body of Assam and identified as Scenedesmus obliquus (KC733762). At 13.8±1.5% CO2 and 25 °C, maximum biomass (4.975±0.003 g L(-1)) and maximum CO2 fixation rate (252.883±0.361 mg L(-1) d(-1)) were obtained which were higher than most of the relevant studies. At elevated temperature (40 °C) and 13.8±1.5% CO2 maximum biomass (0.883±0.001 g L(-1)) was obtained. The carbohydrate, protein, lipid, and chlorophyll content of the CO2 treated SA1 were 30.87±0.64%, 9.48±1.65%, 33.04±0.46% and 6.03±0.19% respectively, which were higher than previous reports. Thus, SA1 could prove to be a potential candidate for CO2 sequestration from flue gas as well as for the production of value added substances.
Samarpita Basu; Abhijit Sarma Roy; Kaustubha Mohanty; Aloke K. Ghoshal. Enhanced CO2 sequestration by a novel microalga: Scenedesmus obliquus SA1 isolated from bio-diversity hotspot region of Assam, India. Bioresource Technology 2013, 143, 369 -377.
AMA StyleSamarpita Basu, Abhijit Sarma Roy, Kaustubha Mohanty, Aloke K. Ghoshal. Enhanced CO2 sequestration by a novel microalga: Scenedesmus obliquus SA1 isolated from bio-diversity hotspot region of Assam, India. Bioresource Technology. 2013; 143 ():369-377.
Chicago/Turabian StyleSamarpita Basu; Abhijit Sarma Roy; Kaustubha Mohanty; Aloke K. Ghoshal. 2013. "Enhanced CO2 sequestration by a novel microalga: Scenedesmus obliquus SA1 isolated from bio-diversity hotspot region of Assam, India." Bioresource Technology 143, no. : 369-377.