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  • Articles  (698)
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  • 1
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    Mesoscale variability and mean flow interaction near the Gulf Stream as seen by satellite altimetry and numerical modelling (2009)
    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 Master of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 2001
    Description: The interaction between the eddy field and the mean flow near the Gulf Stream is studied here using satellite altimeter measurements and an eddy resolving numerical modeL. The eddy vorticity flux in the quasigeostrophic framework is obtained from the stream function standard deviation and spatial correlation function assuming the correlation function is homogeneous. An analytical expression is found for the stream function correlation using the altimetric and numerical data. Cases when the correlation function is anisotropic are compared to the isotropic case previously studied by Hogg (1993), who found that the eddy vorticity flux drives two counter rotating gyres on either side of the stream. The anisotropy can be important in the eddy vorticity flux, even when its departure from the isotropic case is smalL. Meridional or zonal anisotropies can drive recirculation gyres similar in strength and position to the ones driven by the isotropic case. The results when including anisotropy in the diagonal direction suggest that the homogenoeus assumption may not be valid.
    Description: This work was founded in part by a Fulbright/CONACyT fellowship and a J. Seward Johnson Fellowship through the Education Offce in WHOI.
    Keywords: Altimeter ; Data processing ; Eddy flux ; Mathematical models
    Repository Name: Woods Hole Open Access Server
    Type: Thesis
    Format: application/pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Structural constraints in expansion segments from a midge 26S rDNA (1995)
    Springer
    Journal of molecular evolution 41 (1995), S. 1016-1021 
    Details
    ISSN: 1432-1432
    Keywords: Chironomus ; LSU rRNA evolution ; Expansion segments ; Compensatory mutations ; rRNA processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract DNA sequences representing approximately 40% of the large-subunit rRNA gene from the lower dipteran Chironomus thummi were analyzed. Once aligned with their Drosophila counterparts, sequence and base content comparisons were carried out. Sequence identity was found to be high overall, except for six regions that displayed a local bias in nucleotide composition toward AT. These regions were identified as expansion segments D3, D4, D5, D6, D7a, and D12. Besides base sequence divergence, differences in length were observed between the respective variable domains of the two species, particularly for D7a. Prediction of secondary structure showed that the folding of the Chironomus expansion segments analyzed is in agreement with the general patterns proposed for eukaryotic LSU rRNA. The comparison with Drosophila revealed also that the Chironomus secondary structures of the variable domains are supported by multiple compensatory substitutions or even compensatory insertions. Chironomus D7a displayed an unusual structural feature with respect to the insect D7a models that have been inferred up to now. The structural constraint observed in the expansion segments of Diptera so distantly related as midges and Drosophila suggests that these regions contribute to some functional role. Concerning the D7a of insects so far analyzed, there can be, in addition to a conserved secondary structure, a nucleotide composition constraint that might be important for the process giving rise to the alpha and beta halves of the 26S rRNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173183
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  • 3
    Electronic Resource
    Electronic Resource
    Functional analysis of the 3′-terminal part of the Balbiani ring 2.2 gene by interspecies sequence comparison (1990)
    Springer
    Journal of molecular evolution 31 (1990), S. 221-227 
    Details
    ISSN: 1432-1432
    Keywords: Balbiani rings ; Nucleotide sequence ; 3′ ends ; Repeat units ; Evolutionary conservation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An interspecies comparison was made between the 3′ ends of Balbiani ring genes fromChironomus. The comparison was focused on the BR2.2 gene, and a part at the 3′ end fromChironomus pallidivittatus (which included also a segment of the gene core) was cloned. Its sequence, and other previously published BR sequences from this species and fromChironomus tentans were used in the analysis. The 3′ parts of these repetitive genes can be divided into a region belonging to the core of the genes followed by a terminal region. In the core region the repeats (each of which consists of a constant part and a subrepeated part) are highly similar and the constant parts show little interspecies differentiation. Furthermore, the two parts of the repeats are units in an evolutionary and probably also functional sense. The terminal region contains modified constant units, usually isolated betwen acidic so-called cys regions, the whole arrangement lying upstream of an intron toward a 3′-terminal exon. Most of the modified constant units are mosaics in rates of evolution with stable outer quarters bordering to equally stable cys regions and a central half with a very high rate of evolution. One of the terminal units, present only in the BR2.2 gene and second from the end, differs distinctly not only from corresponding core units but also from other terminal units in the three normally active BR genes. It lies upstream of all cys regions and is evolutionarily conserved over most of its length. Furthermore, two-dimensional protein structure prediction does not exclude an endoproteolytic cleavage site in this unit. Such a site appears unlikely in other terminal or core regions. This is of interest in view of evidence for intracellular cleavage of the BR2.2 terminal region with liberation of a part containing a DNA-binding domain (Botella et al. 1988). All in all the fine anatomy of evolutionary changes at the BR gene termini shows interesting correlations with postulated functional relations and may have predictive value in the further functional analysis of this part of the gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109499
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  • 4
    Electronic Resource
    Electronic Resource
    Subrepeats within the BR1β repeat unit inChironomus pallidivittatus can be classified into different types depending on codon usage (1988)
    Springer
    Journal of molecular evolution 27 (1988), S. 298-302 
    Details
    ISSN: 1432-1432
    Keywords: Balbiani rings ; cDNA clones ; Nucleotide sequence ; Repeat units ; Subrepeats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A new type of repeat unit was isolated from Balbiani ring 1 ofChironomus pallidivittatus and designated, BR1β repeat. It consists of a constant and a subrepeated part, like previously described units belonging to the core blocks of the BR genes. The subrepeated part contains 10-codon subrepeats with an arrangement similar to the subrepeats of the previously described BR2β gene. The present unit differs from earlier reported core units firstly in a much lower number of copies (about 15) per genome, which are tandemly arranged. Secondly, the number of subrepeats per BR1β repeat unit can show great variations. On the basis of the pattern of codon usage, three types of subrepeats can be distinguished. One type lies 5′-proximal in the subrepeat array and consists of variable numbers of subrepeats almost identical at the nucleotide level. The last complete subrepeat represents another type, with consistent differences in codon usage as compared to subrepeats of the proximal type. Finally, there is an intermediate type represented by the subrepeat preceding the distal one. Here, codon characteristics from proximal and distal subrepeats are mixed in a patchy and irregular way. The evolution of the arrays can be understood either as being the result of subrepeat formation in two steps (occurring before and after amplification of whole repeat units) or as the result of a continuous process in which there is evidence for participation of gene conversion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02101191
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  • 5
    Electronic Resource
    Electronic Resource
    The Clostridium botulinum GerAB germination protein is located in the inner membrane of spores (2005)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 253 (2005), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Clostridium botulinum dormant spores germinate in presence of l-alanine via a specific receptor composed of GerAA, GerAB and GerAC proteins. In Bacillus subtilis spores, GerAA and GerAC proteins were located in the inner membrane of the spore. We studied the location of the GerAB protein in C. botulinum spore fractions by Western-blot analysis, using an antipeptidic antibody. The protein GerAB was in vitro translated and used to confirm the specificity of the antibodies. GerAB was not present in a coat and spore outer membrane fraction but was present in a fraction of decoated spores containing inner membrane. These results strongly suggest that the protein GerAB is located in the inner membrane of the spore.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsle.2005.09.037
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  • 6
    Electronic Resource
    Electronic Resource
    Induction of synthesis of a nuclear protein accompanies changes in Balbiani ring expression
    Amsterdam : Elsevier
    Insect Biochemistry and Molecular Biology 22 (1992), S. 471-479 
    Details
    ISSN: 0965-1748
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0965-1748(92)90143-3
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  • 7
    Electronic Resource
    Electronic Resource
    Inhibition by nomegestrol acetate and other synthetic progestins on proliferation and progesterone receptor content of T47-D human breast cancer cells
    Amsterdam : Elsevier
    The @Journal of Steroid Biochemistry and Molecular Biology 50 (1994), S. 41-47 
    Details
    ISSN: 0960-0760
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0960-0760(94)90170-8
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  • 8
    Electronic Resource
    Electronic Resource
    Immunocytochemical localization of glutamine synthetase in leaves of tomato seedlings
    Amsterdam : Elsevier
    Micron And Microscopica Acta 18 (1987), S. 219-220 
    Details
    ISSN: 0739-6260
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0739-6260(87)90068-2
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  • 9
    Electronic Resource
    Electronic Resource
    Parity-violating effects for unpolarized electron scattering
    Amsterdam : Elsevier
    Nuclear Physics, Section A 433 (1985), S. 559-579 
    Details
    ISSN: 0375-9474
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(85)90018-1
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  • 10
    Electronic Resource
    Electronic Resource
    Muon capture beyond V - A currents
    Amsterdam : Elsevier
    Nuclear Physics, Section A 414 (1984), S. 456-464 
    Details
    ISSN: 0375-9474
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(84)90612-2
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