The limnological investigation of any body of water is undertaken in order to secure more accurate information concerning the factors which play an important role in fish production or sanitation. This study shows the qualitative and quantitative planktonic algae in Lake Dallas, for the year 1937-38.

The built environment has largely separated itself from the natural one, making demands of nature, and requiring the natural environment to exist on its terms. This prevailing condition has led to the detriment of the natural environment and consequently, those who must inhabit both. Because of this, a shift from the domination of the natural environment to reconciliation with it is necessary. Serving as an intermediary between these two worlds, architecture has the potential to blur the boundaries once created by the built environment in the pursuit of reconciliation. Architecture can learn from the natural environment and take that which has been poorly adapted to aim for a more synchronous future. Shaping culture and perspective, architecture can serve as a signal to humanity that this reconciliation is worth pursuing. This thesis explores the dialogue between form and facade to comment on architecture's flawed yet hopeful path as it seeks a more sustainable relationship with nature. / Master of Architecture / The facade acts as an element of nature, attaching itself to the building like a mask as if it were nature itself taking over the building. Composed of coral-inspired ceramic pieces, the facade hosts an alternative green wall of algae. An otherwise typical rectilinear building form transforms itself, stretching certain spaces beyond its bounds to reach out to the facade as if a reconciliation is desired. This thesis explores the dialogue between form and facade to comment on architecture's flawed yet hopeful path as it seeks a more sustainable relationship with nature.

Indiana University-Purdue University Indianapolis (IUPUI) / This project examines the impact of confounding variables that have limited the accuracy of remotely predicting phycocyanin in three Indiana drinking and recreational water reservoirs. In-situ field reflectance spectra were collected from June to November 2006 over a wide range of algal bloom conditions using an ASD Fieldspec (UV/VNIR) spectroradiometer. Groundtruth samples were analyzed for chlorophyll a, phycocyanin, total suspended matter, and other water quality constituents. Previously published spectral algorithms for the detection of phycocyanin were evaluated against lab measured pigment concentrations using linear least squares regression. Algorithm performance varied across study sites (best performing models by reservoir resulted in r2 values of 0.32 to 0.84). Residuals of predicted versus measured pigment concentrations were analyzed against concentration of potential confounding water constituents. Residual analysis revealed optically active constituents contributed between 25% and 95% of original phycocyanin model errors. Inclusion of spectral variables into models to account for significant confounders resulted in improved spectral estimates of phycocyanin (r2 = 0.56 to 0.93).

No description available.

Two species of cyanobacteria (Fischeralla sp. 29161 and Phormidium autumnale) and one species of green algae (Fritschiella tuberosa) were found to promote survival of Legionella pneumophila in mineral salts medium cocultures. During the early stage of incubation Fischerella sp. supported growth of Legionella pneumophila even though the bacteria would not grow in the algae-free basal medium.

<p> The time relationship of metabolically important trace metals (Fe, Cu, Zn, Co, Cd, Cr) in Lake Erie plankton were analyzed from samples collected during an algal (Aphanizomenon) bloom. Iron and cobalt showed a rapid increase in concentretion during the initial period of the bloom, followed by a decrease and levelling off to an equilibrium value. Copper and zinc were found to behave similarily undergoing a slight decrease at the beginning and then steadily increasing in concentration with time. Different depths of sampling were correlated to the life-death cycle of the organism and specific metal concentration trends. Algae from the lowest level of sampling (9.7 m; dead organism level) exhibited an increasing nutrient concentration (Fe, Zn, Co, and PO4) with time.</p> <p> Factor analysis suggested a Fe, Co, depth, 1/Biomass relationship; a Cu, Zn relationship; and a PO4, time relationship. The first two were verified from the experimental results; the last was not.</p> / Thesis / Bachelor of Science (BSc)

This project examined the role of functional diversity of bacterial prey organisms on a mixotrophic flagellate’s function. The concept of functional diversity and its role for ecosystem functioning is a subject of ongoing research and controversially discussed. Mixotrophy is the combination of different modes of nutrition in one organism. In the case of this project’s organism, Ochromonas tuberculata, the combination of phototrophy and heterotrophy or phagotrophy. Mixotrophs can have a severe impact on nutrient cycling or carbon fixation in aquatic ecosystems, therefore it is important to investigate what drives their ecological functioning. For this project, two sets of bacterial prey traits were investigated and their effect on the flagellate’s growth rate. The first experiments involved the addition of heat-killed bacterial prey with heterotrophic mode of nutrition (Escherichia coli) and phototrophic mode of nutrition (Synechocystis sp.) on their own and in conjunction to generate a functional diversity. The last experiment investigated heat-killed Gram-negative (Escherichia coli) and Gram-positive bacterial prey (Staphylococcus aureus and Bacillus subtilis) each on their own and in conjunction. The acclimated O. tuberculata cultures in this project were non-axenic and flagellate cell densities were recorded daily over five days after the addition of the prey in each experiment. The results showed that prey with a phototrophic mode of nutrition resulted in a significantly higher growth rate over the course of the experiments than heterotrophic prey or a mix of both under the experimental conditions. For the second set of bacterial functions tested, the results showed no clear effect of the different bacterial functions on the flagellate’s growth rate. This was attributed to the heat-killing method used. The heat-killing method is assumed to have harmed the bacteria structurally and therefore negate the effect of the differences in cell wall properties. Therefore, this question could not be fully investigated. Overall, the experimental setup was not ideal to tackle the research question, nevertheless the results can provide ideas for possible improvements of the experimental setup.

Microalgae biomass has potential as a feedstock for various bioproducts, including biofuel. Algae can be cultivated on treated wastewater or on untreated wastewater, accomplishing treatment as a co-benefit. Greater understanding of algal productivity is needed. This study compared the net productivity of naturally forming algae polycultures, and monocultures of Scenedesmus obliquus (DOE0152Z) and Tribonema minus cultivated on treated municipal wastewater or primary clarifier effluent. The experiments were conducted in outdoor, 1350-L and 1000-L, raceway tanks in coastal central California during a multi-year period. A linear regression model of net productivity (i.e., based on the difference of biomass in the influent and effluent of the raceways) was developed. The highest productivity culture was a polyculture grown on primary clarifier effluent at 20.0 +/- 3.8 g/m2-day (ash-free dry weight, AFDW over 12 months of continuous cultivation). The monoculture with the highest productivity was Tribonema minus at 16.1 +/- 0.8 g/m2-day (summer through winter). In the various strain and wastewater type combinations tested, solar radiation was the most statistically significant predictor of net productivity (p

No description available.

A taxonomic investigation of the algal flora of the Brigham Young University campus was conducted from October 1971 to August 1972. This algal flora consisted of 27 genera and 36 species of Chlorophyta, 2 genera and 2 species of Euglenophyta, 32 genera and 106 species of Bacillariophyceae (including 16 genera and 33 species of soil diatoms), 1 genus and 2 species of Chrysophyta excluding diatoms and 6 genera and 14 species of Cyanophyta. Diatoms were the predominent algae in this study. Chlorococcum humicola, Vaucheria geminata, Amphora normani, Hantzschia amphioxys and Oscillatoria sancta were prominent in the greenhouses. In the arboretum pond, Melosira varians, Synedra ulna var. subaegualis and Cymbella cistula were abundant in the winter whereas Spirogyra dubia, Spirogyra jugalis and Spirogyra porticalis grew throughout the year, especially in the late spring. Diatoma tenue var. elongatum, Diatoma vulgare, Cocconeis pediculus and Gomphonema parvulum were prominent stream algae in the early summer. Cladophora glomerata grew in large nmbers at stream site two in the winter.