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Geobiology of marine magnetotactic bacteria
(Massachusetts Institute of Technology, 2006)
Magnetotactic bacteria (MTB) biomineralize intracellular membrane-bound crystals of magnetite (Fe3O4) or greigite (Fe3S4), and are abundant in the suboxic to anoxic zones of stratified marine environments worldwide. Their ...
Relating behavioral context to acoustic parameters of bottlenose dolphin (Tursiops truncatus) vocalizations
(Massachusetts Institute of Technology, 2001)
This thesis presents methods to analyze the function of vocalizations of the bottlenose dolphin, Tursiops truncatus. The thesis uses the social interaction as the basic unit of analysis, and maintains a deliberate focus ...
The role of denitrification in the nitrogen cycle of New England salt marshes
(Massachusetts Institute of Technology, 2002)
I used direct measurements of nitrogen gas (N₂ fluxes and a ¹⁵N stable isotope tracer to determine the contribution of denitrification to salt marsh sediment N cycling. Denitrification in salt marsh tidal creekbottoms is ...
The aggregation of clay minerals and marine microalgal cells : physicochemical theory and implications for controlling harmful algal blooms
(Massachusetts Institute of Technology, 2001)
In recent years, the use of clay minerals has emerged as one of the most promising strategies for directly controlling harmful algal blooms (HABs). Its principle is based on the mutual aggregation of algal cells and mineral ...
Scale closure in upper ocean optical properties : from single particles to ocean color
(Massachusetts Institute of Technology, 2002)
Predictions of chlorophyll concentration from satellite ocean color are an indicator of phytoplankton primary productivity, with implications for foodweb structure, fisheries, and the global carbon cycle. Current models ...
Biophysical and structural characterization of components from the nuclear pore complex and the ubiquitin pathway
(Massachusetts Institute of Technology, 2010)
Formation of an endomembrane system in the eukaryotic cell is a hallmark of biological evolution. One such system is the nuclear envelope (NE), composed of an inner and outer membrane, used to form a nucleus and enclose ...
Regulation of gene expression and cell state in embryonic stem cells
(Massachusetts Institute of Technology, 2010)
Cell state is established and maintained through the combined action of transcription factors, chromatin regulators and signaling pathways, which all contribute to a transcriptional regulatory circuitry. Embryonic stem ...
Identification of new genes and pathways that act to delay C. elegans aging
(Massachusetts Institute of Technology, 2008)
Aging of an organism is determined by both stochastic and genetic components. The importance of genes is illustrated by the discovery of single gene mutations that alter lifespans of species ranging from invertebrates C. ...
Computational approaches for the design and prediction of protein-protein interactions
(Massachusetts Institute of Technology, 2007)
There is a large class of applications in computational structural biology for which atomic-level representation is crucial for understanding the underlying biological phenomena, yet explicit atomic-level modeling is ...
Approaches for assessing the presence and impact of thyroid hormone disrupting chemicals in Delphinid cetaceans
(Massachusetts Institute of Technology, 2006)
Cetacean blubber is a primary site for lipid storage, which the animal utilizes during periods of energetic stress. It is important to understand how the blubber responds to factors such as ontogeny, water temperature, ...