Micro-scale interactions between chemotactic bacteria and algae
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2010.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2011
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| Online Access: | http://hdl.handle.net/1721.1/60787 |
| _version_ | 1826212016693444608 |
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| author | Vahora, Nisha |
| author2 | Martin F. Polz and Roman Stocker. |
| author_facet | Martin F. Polz and Roman Stocker. Vahora, Nisha |
| author_sort | Vahora, Nisha |
| collection | MIT |
| description | Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2010. |
| first_indexed | 2024-09-23T15:14:41Z |
| format | Thesis |
| id | mit-1721.1/60787 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T15:14:41Z |
| publishDate | 2011 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/607872019-04-12T15:39:36Z Micro-scale interactions between chemotactic bacteria and algae Vahora, Nisha Martin F. Polz and Roman Stocker. Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering. Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering. Civil and Environmental Engineering. Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2010. Cataloged from PDF version of thesis. Includes bibliographical references (p. 47-51). Traditional views of marine environments describe the ocean pelagic zone as a homogeneous nutrient-poor environment. Heterotrophic marine bacteria that have evolved high-energy mechanisms for swimming abilities and sensing nutrient gradients would gain no survival advantage under this model. Recent identification of microscale (<1cm) nutrient patches, such as those produced by algal exudates, explain a potential for these evolved functions. With this new model for the pelagic zone, bacteria, through chemotaxis and motility, can sense and respond to microscale carbon patches exuded from growing algae. This study examines possible conditions necessary under which it is advantageous to swim. As an initial step to test this hypothesis, we developed a system to investigate bacterial chemotaxis to algal exudates. Two algae from the genus, Thalassiosira, which differed in size, were grown in artificial seawater and filtered, with the use of a novel instrument, to generate nutrient heterogeneity at the microscale. Pseudoalteromonas haloplanktis was added to algal cultures with varying algae:bacteria ratios of 1:250 to 1:50,000 and bacterial chemotaxis was observed by localization around individual algae. P. haloplanktis exhibited chemotaxis towards the larger algae Thalassiosira rotula within seconds but not Thalassiosira weissflogii suggesting larger algae elicit a chemotactic response. Results provide evidence of real time clustering in response to the presence of live algae and suggest a mechanism that provides a fitness advantage over non-motile bacteria. by Nisha Vahora. M.Eng. 2011-01-26T14:24:16Z 2011-01-26T14:24:16Z 2010 2010 Thesis http://hdl.handle.net/1721.1/60787 695400141 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 51 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Civil and Environmental Engineering. Vahora, Nisha Micro-scale interactions between chemotactic bacteria and algae |
| title | Micro-scale interactions between chemotactic bacteria and algae |
| title_full | Micro-scale interactions between chemotactic bacteria and algae |
| title_fullStr | Micro-scale interactions between chemotactic bacteria and algae |
| title_full_unstemmed | Micro-scale interactions between chemotactic bacteria and algae |
| title_short | Micro-scale interactions between chemotactic bacteria and algae |
| title_sort | micro scale interactions between chemotactic bacteria and algae |
| topic | Civil and Environmental Engineering. |
| url | http://hdl.handle.net/1721.1/60787 |
| work_keys_str_mv | AT vahoranisha microscaleinteractionsbetweenchemotacticbacteriaandalgae |