TISZA BELL | Montana State University - Bozeman (original) (raw)

Papers by TISZA BELL

Research paper thumbnail of Sources and resources: importance of nutrients, resource allocation, and ecology in microalgal cultivation for lipid accumulation

Applied Microbiology and Biotechnology, 2014

Regardless of current market conditions and availability of conventional petroleum sources, alter... more Regardless of current market conditions and availability of conventional petroleum sources, alternatives are needed to circumvent future economic and environmental impacts from continued exploration and harvesting of conventional hydrocarbons. Diatoms and green algae (microalgae) are eukaryotic photoautotrophs that can utilize inorganic carbon (e.g., CO 2 ) as a carbon source and sunlight as an energy source, and many microalgae can store carbon and energy in the form of neutral lipids. In addition to accumulating useful precursors for biofuels and chemical feed stocks, the use of autotrophic microorganisms can further contribute to reduced CO 2 emissions through utilization of atmospheric CO 2 . Because of the inherent connection between carbon, nitrogen, and phosphorus in biological systems, macronutrient deprivation has been proven to significantly enhance lipid accumulation in different diatom and algae species. However, much work is needed to understand the link between carbon, nitrogen, and phosphorus in controlling resource allocation at different levels of biological resolution (cellular versus ecological). An improved understanding of the relationship between the effects of N, P, and micronutrient availability on carbon resource allocation (cell growth versus lipid storage) in microalgae is needed in conjunction with life cycle analysis. This mini-review will briefly discuss the current literature on the use of nutrient deprivation and other conditions to control and optimize microalgal growth in the context of cell and lipid accumulation for scale-up processes.

Research paper thumbnail of Sources and resources: importance of nutrients, resource allocation, and ecology in microalgal cultivation for lipid accumulation

Applied Microbiology and Biotechnology, 2014

Regardless of current market conditions and availability of conventional petroleum sources, alter... more Regardless of current market conditions and availability of conventional petroleum sources, alternatives are needed to circumvent future economic and environmental impacts from continued exploration and harvesting of conventional hydrocarbons. Diatoms and green algae (microalgae) are eukaryotic photoautotrophs that can utilize inorganic carbon (e.g., CO 2 ) as a carbon source and sunlight as an energy source, and many microalgae can store carbon and energy in the form of neutral lipids. In addition to accumulating useful precursors for biofuels and chemical feed stocks, the use of autotrophic microorganisms can further contribute to reduced CO 2 emissions through utilization of atmospheric CO 2 . Because of the inherent connection between carbon, nitrogen, and phosphorus in biological systems, macronutrient deprivation has been proven to significantly enhance lipid accumulation in different diatom and algae species. However, much work is needed to understand the link between carbon, nitrogen, and phosphorus in controlling resource allocation at different levels of biological resolution (cellular versus ecological). An improved understanding of the relationship between the effects of N, P, and micronutrient availability on carbon resource allocation (cell growth versus lipid storage) in microalgae is needed in conjunction with life cycle analysis. This mini-review will briefly discuss the current literature on the use of nutrient deprivation and other conditions to control and optimize microalgal growth in the context of cell and lipid accumulation for scale-up processes.

Research paper thumbnail of Surprises and Insights from Long-Term Aquatic Data Sets and Experiments

Long-term research on freshwater ecosystems provides insights that can be difficult to obtain fro... more Long-term research on freshwater ecosystems provides insights that can be difficult to obtain from other approaches. Widespread monitoring of ecologically relevant water-quality parameters spanning decades can facilitate important tests of ecological principles. Unique long-term data sets and analytical tools are increasingly available, allowing for powerful and synthetic analyses across sites. Long-term measurements or experiments in aquatic systems can catch rare events, changes in highly variable systems, time-lagged responses, cumulative effects of stressors, and biotic responses that encompass multiple generations. Data are available from formal networks, local to international agencies, private organizations, various institutions, and paleontological and historic records; brief literature surveys suggest much existing data are not synthesized. Ecological sciences will benefit from careful maintenance and analyses of existing long-term programs, and subsequent insights can aid in the design of effective future long-term experimental and observational efforts. Long-term research on freshwaters is particularly important because of their value to humanity.

Research paper thumbnail of Surprises and Insights from Long-Term Aquatic Data Sets and Experiments

Long-term research on freshwater ecosystems provides insights that can be difficult to obtain fro... more Long-term research on freshwater ecosystems provides insights that can be difficult to obtain from other approaches. Widespread monitoring of ecologically relevant water-quality parameters spanning decades can facilitate important tests of ecological principles. Unique long-term data sets and analytical tools are increasingly available, allowing for powerful and synthetic analyses across sites. Long-term measurements or experiments in aquatic systems can catch rare events, changes in highly variable systems, time-lagged responses, cumulative effects of stressors, and biotic responses that encompass multiple generations. Data are available from formal networks, local to international agencies, private organizations, various institutions, and paleontological and historic records; brief literature surveys suggest much existing data are not synthesized. Ecological sciences will benefit from careful maintenance and analyses of existing long-term programs, and subsequent insights can aid in the design of effective future long-term experimental and observational efforts. Long-term research on freshwaters is particularly important because of their value to humanity.

Research paper thumbnail of Balsam fir leaf litter extract stimulates growth of the green snow alga Chloromonas rosae var. psychrophila (Chlorophyta, Volvocales) from Whiteface Mountain, New York

Nova Hedwigia, 2008

Chloromonas rosae var. psychrophila is the dominant snow alga at Whiteface Mountain, New York, an... more Chloromonas rosae var. psychrophila is the dominant snow alga at Whiteface Mountain, New York, and balsam fir needles often cover the snowbanks in which it lives. Two strains of this snow alga, CU 204 (UTEX SNO 11) and CU 479A (UTEX SNO 56), were isolated from Whiteface Mountain into axenic culture and were grown in balsam fir leaf litter extracts at varying concentrations over a four-week period. Each strain grew better when extract was added to defined modified M-l medium (control) at all concentrations tested (200:1, 100:1, 50:1, and 25:1; medium:extract) with best growth at 100:1. In strain CU 479A, there was less growth in the highest extract concentration (25:1) when compared to the other concentrations of extracts employed. Both strains showed an increase of growth over a 28-day period when results were pooled for each extract concentration. The results of these experiments suggest that balsam fir leachates stimulate the growth of this snow alga in nature, which may be a selective advantage.

Research paper thumbnail of Sources and resources: importance of nutrients, resource allocation, and ecology in microalgal cultivation for lipid accumulation

Applied Microbiology and Biotechnology, 2014

Regardless of current market conditions and availability of conventional petroleum sources, alter... more Regardless of current market conditions and availability of conventional petroleum sources, alternatives are needed to circumvent future economic and environmental impacts from continued exploration and harvesting of conventional hydrocarbons. Diatoms and green algae (microalgae) are eukaryotic photoautotrophs that can utilize inorganic carbon (e.g., CO 2 ) as a carbon source and sunlight as an energy source, and many microalgae can store carbon and energy in the form of neutral lipids. In addition to accumulating useful precursors for biofuels and chemical feed stocks, the use of autotrophic microorganisms can further contribute to reduced CO 2 emissions through utilization of atmospheric CO 2 . Because of the inherent connection between carbon, nitrogen, and phosphorus in biological systems, macronutrient deprivation has been proven to significantly enhance lipid accumulation in different diatom and algae species. However, much work is needed to understand the link between carbon, nitrogen, and phosphorus in controlling resource allocation at different levels of biological resolution (cellular versus ecological). An improved understanding of the relationship between the effects of N, P, and micronutrient availability on carbon resource allocation (cell growth versus lipid storage) in microalgae is needed in conjunction with life cycle analysis. This mini-review will briefly discuss the current literature on the use of nutrient deprivation and other conditions to control and optimize microalgal growth in the context of cell and lipid accumulation for scale-up processes.

Research paper thumbnail of Sources and resources: importance of nutrients, resource allocation, and ecology in microalgal cultivation for lipid accumulation

Applied Microbiology and Biotechnology, 2014

Regardless of current market conditions and availability of conventional petroleum sources, alter... more Regardless of current market conditions and availability of conventional petroleum sources, alternatives are needed to circumvent future economic and environmental impacts from continued exploration and harvesting of conventional hydrocarbons. Diatoms and green algae (microalgae) are eukaryotic photoautotrophs that can utilize inorganic carbon (e.g., CO 2 ) as a carbon source and sunlight as an energy source, and many microalgae can store carbon and energy in the form of neutral lipids. In addition to accumulating useful precursors for biofuels and chemical feed stocks, the use of autotrophic microorganisms can further contribute to reduced CO 2 emissions through utilization of atmospheric CO 2 . Because of the inherent connection between carbon, nitrogen, and phosphorus in biological systems, macronutrient deprivation has been proven to significantly enhance lipid accumulation in different diatom and algae species. However, much work is needed to understand the link between carbon, nitrogen, and phosphorus in controlling resource allocation at different levels of biological resolution (cellular versus ecological). An improved understanding of the relationship between the effects of N, P, and micronutrient availability on carbon resource allocation (cell growth versus lipid storage) in microalgae is needed in conjunction with life cycle analysis. This mini-review will briefly discuss the current literature on the use of nutrient deprivation and other conditions to control and optimize microalgal growth in the context of cell and lipid accumulation for scale-up processes.

Research paper thumbnail of Surprises and Insights from Long-Term Aquatic Data Sets and Experiments

Long-term research on freshwater ecosystems provides insights that can be difficult to obtain fro... more Long-term research on freshwater ecosystems provides insights that can be difficult to obtain from other approaches. Widespread monitoring of ecologically relevant water-quality parameters spanning decades can facilitate important tests of ecological principles. Unique long-term data sets and analytical tools are increasingly available, allowing for powerful and synthetic analyses across sites. Long-term measurements or experiments in aquatic systems can catch rare events, changes in highly variable systems, time-lagged responses, cumulative effects of stressors, and biotic responses that encompass multiple generations. Data are available from formal networks, local to international agencies, private organizations, various institutions, and paleontological and historic records; brief literature surveys suggest much existing data are not synthesized. Ecological sciences will benefit from careful maintenance and analyses of existing long-term programs, and subsequent insights can aid in the design of effective future long-term experimental and observational efforts. Long-term research on freshwaters is particularly important because of their value to humanity.

Research paper thumbnail of Surprises and Insights from Long-Term Aquatic Data Sets and Experiments

Long-term research on freshwater ecosystems provides insights that can be difficult to obtain fro... more Long-term research on freshwater ecosystems provides insights that can be difficult to obtain from other approaches. Widespread monitoring of ecologically relevant water-quality parameters spanning decades can facilitate important tests of ecological principles. Unique long-term data sets and analytical tools are increasingly available, allowing for powerful and synthetic analyses across sites. Long-term measurements or experiments in aquatic systems can catch rare events, changes in highly variable systems, time-lagged responses, cumulative effects of stressors, and biotic responses that encompass multiple generations. Data are available from formal networks, local to international agencies, private organizations, various institutions, and paleontological and historic records; brief literature surveys suggest much existing data are not synthesized. Ecological sciences will benefit from careful maintenance and analyses of existing long-term programs, and subsequent insights can aid in the design of effective future long-term experimental and observational efforts. Long-term research on freshwaters is particularly important because of their value to humanity.

Research paper thumbnail of Balsam fir leaf litter extract stimulates growth of the green snow alga Chloromonas rosae var. psychrophila (Chlorophyta, Volvocales) from Whiteface Mountain, New York

Nova Hedwigia, 2008

Chloromonas rosae var. psychrophila is the dominant snow alga at Whiteface Mountain, New York, an... more Chloromonas rosae var. psychrophila is the dominant snow alga at Whiteface Mountain, New York, and balsam fir needles often cover the snowbanks in which it lives. Two strains of this snow alga, CU 204 (UTEX SNO 11) and CU 479A (UTEX SNO 56), were isolated from Whiteface Mountain into axenic culture and were grown in balsam fir leaf litter extracts at varying concentrations over a four-week period. Each strain grew better when extract was added to defined modified M-l medium (control) at all concentrations tested (200:1, 100:1, 50:1, and 25:1; medium:extract) with best growth at 100:1. In strain CU 479A, there was less growth in the highest extract concentration (25:1) when compared to the other concentrations of extracts employed. Both strains showed an increase of growth over a 28-day period when results were pooled for each extract concentration. The results of these experiments suggest that balsam fir leachates stimulate the growth of this snow alga in nature, which may be a selective advantage.