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  • 1
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    Late Holocene hurricane activity and climate variability in the northeastern Gulf of Mexico (2011)
    Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-25
    Description: Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 2011
    Description: Hurricane activity in the Northeastern Gulf of Mexico and its relationship to regional and large-scale climate variability during the Late Holocene is explored. A 4500-year record of hurricane-induced storm surges is developed from sediment cores collected from a coastal sinkhole near Apalachee Bay, Florida. Reconstructed hurricane frequency is shown to exhibit statistically significant variability with the greatest activity occurring between 2700 and 2400 years ago and the least activity between 1900 to 1600 years ago and after 600 years ago. Proxy records of stormrelevant climate variables contain similar timescales of variability and suggest both regional and large-scale mechanisms have influenced hurricane activity on centennial to millennial timescales. In particular, low-frequency migrations of the Loop Current may exercise control over regional hurricane activity by changing the thermal structure of the upper ocean and influencing the role of storm-induced upwelling on hurricane intensification. A new method for estimating the frequency of hurricanegenerated storm surges is presented and applied to Apalachee Bay, Florida. Multisite paleohurricane reconstructions from this region are developed, and the effects of geographic boundary conditions and temporal resolution on estimates of paleohurricane frequency are explored.
    Description: Financial support provided by the American Meteorological Society, the National Science Foundation, the Bermuda Risk Prediction Initiative, the National Center for Airborne Laser Mapping, and the Coastal Ocean Institute.
    Keywords: Paleoclimatology ; Holocene ; Ocean currents
    Repository Name: Woods Hole Open Access Server
    Type: Thesis
    Format: application/pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Attachment of the larva of the ascidian Diplosoma listerianum (1973)
    Springer
    Marine biology 21 (1973), S. 47-58 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Histological and ultrastructural studies of free-swimming and attached larvae of Diplosoma listerianum Milne Edwards indicate that initial attachment is by means of papillae, which secrete an adhesive substance. The source of the adhesive is the central mass cells of the papilla. These cells secrete large electron-dense granules, and also a mass of reticular material. The granules give rise to the adhesive seen in sections and scanning electron micrographs of attached larvae, although the reticular material may also contribute to the adhesive. Histochemical tests show that protein is present in the granules, together with a small amount of carbohydrate. The reticular material contains sulphated acid mucopolysaccharide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351191
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  • 3
    Electronic Resource
    Electronic Resource
    Solid state spatially resolved 1H and 19F nuclear magnetic resonance spectroscopy of dental materials by stray-field imaging (1999)
    Springer
    Journal of materials science 10 (1999), S. 369-373 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract As part of a program to evaluate the use of stray-field magnetic resonance microimaging (STRAFI) in dental materials research spatially resolved nuclear magnetic resonance (NMR) for solid dental cements has been investigated. By applying a quadrature echo pulse sequence to a specimen positioned in the stray-field of a NMR spectrometer superconducting magnet the magnetic resonance within a thin slice was obtained. The specimen was stepped through the field in 500 μm increments to record 1 and 19F profiles and T2 values at each point. The specimens were fully cured cylinders made from four types of restorative material (glass ionomer, resin modified glass ionomer, compomer, composite). The values for F19T2 varied with material type and reflected the nature of the matrix structure. For all materials containing 19F in the glass two values were calculated for 19F T2, one short and one long. These were relatively invariant. Solid state magic angle spinning (MAS)-NMR showed that they came from the glass. This suggests that a proportion of the element is relatively mobile (in a glass phase) and the remainder is more tightly bound (in a compound dispersed in the glass). This demonstration, that NMR microimaging of both 1H and 19F in solid dental cements is possible, opens up exciting new possibilities for investigating the distribution of these elements (in particular fluorine) in solid dental materials. ©©1999©Kluwer Academic Publishers
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026429908756
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  • 4
    Electronic Resource
    Electronic Resource
    Genetic basis of the MbrC “ploidy” phenotype in Escherichia coli (1997)
    Springer
    Molecular genetics and genomics 256 (1997), S. 291-297 
    Details
    ISSN: 1617-4623
    Keywords: Key wordsmbrC ; secE ; nusG ; Escherichia coli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The mbrC17 mutation in Escherichia coli had been shown to cause conditional growth defects and an increase in the quantity of DNA per cell. The present work was aimed at identifying the mutation. Sequencing showed that the MbrC17 phenotype does not involve glr (murI), as previously suggested. P1 transduction data indicated that the mbrC17 mutation is closely linked to rpoB, and allele exchange showed it to lie within the secE-nusG operon. A single change relative to wild type was found in the secE-nusG region from the mbrC17 strain, a G → A mutation 23 bp upstream of the secE coding sequence. This mutation causes a two-fold increase in the concentration of secE-nusG mRNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004380050572
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  • 5
    Electronic Resource
    Electronic Resource
    A crown-of-thorns outbreak in the eastern Indonesian Archipelago, February 1996 (1996)
    Springer
    Coral reefs 15 (1996), S. 209-210 
    Details
    ISSN: 1432-0975
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01787452
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  • 6
    Electronic Resource
    Electronic Resource
    A crown-of-thorns outbreak in the eastern Indonesian Archipelago, February 1996 (1996)
    Springer
    Coral reefs 15 (1996), S. 209-210 
    Details
    ISSN: 1432-0975
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01787452
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  • 7
    Electronic Resource
    Electronic Resource
    Byssus drifting and the drifting threads of the young post-larval mussel Mytilus edulis (1985)
    Springer
    Marine biology 84 (1985), S. 301-308 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The long, drifting threads secreted by young post-larval mussels (Mytilus edulis L.) are simple monofilaments, distinct in form and function from the attachment byssus threads. The diameters of both thread types are in the micron or sub-micron range but, whereas the attachment threads are of restricted length and terminate in an attachment plaque, drifting threads exceed the post-larva in length by more than two orders in magnitude and are without plaques or any other structures. Transmission electron micrographs of drifting threads show no evidence of internal sub-structure. In contrast, attachment threads appear to be made up of filaments. These studies confirm that the drifting threads are highly effective in enhancing the dispersal of young mussels. The terminal sinking velocity of young drifters is typically ca. 1 mm s-1. At this velocity the suspension range above the sea bed, assuming given values of vertical diffusivity, is estimated to be 0.5 to 5 m. Calculations of the fluid drag experienced by post-larvae in the water column show that the theoretical viscous drag force on the thread is sufficient to account for the reduced sinking rate of drifters. The calculated contribution of the thread to the total drag is approximately one order of magnitude greater than that of the post-larval body. A rapid thread-deployment strategy, shown by post-larvae which are brought into suspension, may prolong each drifting excursion and thus further enhance dispersal in turbulent marine environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392500
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  • 8
    Electronic Resource
    Electronic Resource
    On the expression of the p53 protein in human cancer (1994)
    Springer
    Molecular biology reports 19 (1994), S. 23-29 
    Details
    ISSN: 1573-4978
    Keywords: p53 protein ; p53 gene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987319
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  • 9
    Electronic Resource
    Electronic Resource
    A Study of the Phase Boundaries and Lattice Parameters of the CdS-CdTe Pseudobinary System (1998)
    Springer
    Journal of materials science 17 (1998), S. 1511-1514 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026463426038
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  • 10
    Electronic Resource
    Electronic Resource
    Motion planning and contact control for a tele-assisted hydraulic underwater robot (1996)
    Springer
    Autonomous robots 3 (1996), S. 233-251 
    Details
    ISSN: 1573-7527
    Keywords: hydraulic manipulators ; hybrid position/force control ; dynamic models ; motion planning ; subsea robot ; automatic insertion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Implementing tele-assistance or supervisory control for autonomous subsea robots requires atomic actions that can be called from high level task planners or mission managers. This paper reports on the design and implementation of a particular atomic action for the case of a subsea robot carrying out tasks in contact with the surrounding environment. Subsea vehicles equipped with manipulators can have upward of 11 degrees of freedom (DOF), with degenerate and redundant inverse kinematics. Distributed local motion planning is presented as a means to specify the motion of each robot DOF given a goal point or trajectory. Results are presented to show the effectiveness of the distributed versus non-distributed approach, a means to deal with local minima difficulties, and the performance for trajectory following with and without saturated joint angles on a robot arm. Consideration is also given to the modelling of hydraulic underwater robots and to the resulting design of hybrid position/force control strategies. A model for a hydraulically actuated robot is developed, taking into account the electrohydraulic servovalve, the bulk modulus of oil, piston area, friction, hose compliance and other arm parameters. Open and closed-loop control results are reported for simulated and real systems. Finally, the use of distributed motion planning and sequential position/force control of a Slingsby TA-9 hydraulic underwater manipulator is described, to implement an atomic action for tele-assistance. The specific task of automatically positioning and inserting a Tronic subsea mateable connector is illustrated, with results showing the contact conditions during insertion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00141157
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