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  • Streptocephalus  (2)
  • Cry1Ea4  (1)
  • 1995-1999  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Diagnosis and phylogeny of the new world streptocephalidae (Branchiopoda: Anostraca) (1995)
    Springer
    Hydrobiologia 298 (1995), S. 15-44 
    Details
    ISSN: 1573-5117
    Keywords: Streptocephalus ; morphology ; systematics ; North America ; new species ; cladistics ; fairy shrimp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present an updated diagnosis of 13Streptocephalus species of North America. Three new species are included. A key to the species is provided. The phylogeny of the group is discussed on the basis of (1) a systematic approach (Maeda-Martinezet al., 1995; this volume), which considers the entire distal antennal outgrowth, the frontal appendage, and the morphology of the ovaries as essential in defining different genetic lineages or species-groups, and (2) a cladistic analysis. We suggest that of nine monophyletic groups, three are represented in both the Old and New World. Thus, contrary to former disparsalist hypotheses, we argue that the New World species represent relict forms of ancestral groups fragmented by continental drift (vicariance model).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033798
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  • 2
    Electronic Resource
    Electronic Resource
    A contribution to the systematics of the Streptocephalidae (Branchiopoda: Anostraca) (1995)
    Springer
    Hydrobiologia 298 (1995), S. 203-232 
    Details
    ISSN: 1573-5117
    Keywords: Streptocephalus ; morphology ; classification ; phylogeny ; fairy shrimp ; phyllopod
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract While developing a data base for phylogenetic analysis of the New World streptocephalids we compaired them with species from Africa, Europe, and India. In doing this, we found that the morphology of the peduncle of the distal antennal outgrowth and the biramous ovaries developed in seven North American species can contribute to the systematics of the genus. Thus, our investigation consisted of (1) a review of the external morphology of the antenna, (2) biometry of selected parts of the antenna to obtain informative ratios, (3) a review of the presence or absence of genetal linguiform outgrowths, extension of the non-retractile parts of the penes, and general morphology of the cercopods, (4) a study of the location of the ovaries, and extension of the brood-pouch. On the basis of the results we classifyStreptocephalus into nine species groups. Five subgroups are identified within two of the species groups Several implications of the present approach are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033815
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  • 3
    Electronic Resource
    Electronic Resource
    Cloning and expression of the cry1Ea4 gene of Bacillus thuringiensis and the comparative toxicity of its gene product (1998)
    Springer
    World journal of microbiology and biotechnology 14 (1998), S. 437-441 
    Details
    ISSN: 1573-0972
    Keywords: Bacillus thuringiensis ; Cry1Ea4 ; novel protein ; sequencing ; toxicity comparison
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A new cry gene (cry1Ea4) was cloned and sequenced from a Bacillus thuringiensis isolate native to Mexico (LBIT-147). The gene coded for a 133kDa protoxin which had greater than 99% homology with the holotype Cry1Ea1, as only four mismatches were found between the two amino acid sequences. When the Cry1Ea4 toxin was expressed in a crystal-negative strain of B. thuringiensis, bipyramidal crystals were produced. Purified crystals from this recombinant strain and from the holotype (Cry1Ea1) were bioassayed against first instar larvae of the tobacco hornworm. Statistically different mean LC50 values indicated that Cry1Ea4 was more toxic than its holotype. This increase in toxicity may be attributed to the three amino acids which differ from the holotype sequence in the toxic fragment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008833815965
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