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  • Maize  (2)
  • Percidae  (2)
  • Acoustic microscopy  (1)
  • Springer  (4)
  • Elsevier  (1)
  • Society of Economic Geologists (SEG)
Collection
Keywords
Publisher
  • Springer  (4)
  • Elsevier  (1)
  • Society of Economic Geologists (SEG)
Years
  • 1
    Electronic Resource
    Electronic Resource
    Electrophoretic evidence for relationships and differentiation among members of the percid subgenus Microperca
    Amsterdam : Elsevier
    Biochemical Systematics and Ecology 8 (1980), S. 297-304 
    Details
    ISSN: 0305-1978
    Keywords: Etheostoma ; Microperca ; Percidae ; Perciformes ; chemosystematics ; cladistics ; isozymes ; phenetics ; starch gel electrophoresis
    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/0305-1978(80)90064-2
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Contribution of collagen and mineral to the elastic anisotropy of bone (1994)
    Springer
    Calcified tissue international 55 (1994), S. 381-386 
    Details
    ISSN: 1432-0827
    Keywords: Acoustic microscopy ; Bone ; Collagen fiber ; Elastic anisotropy ; Mineral crystal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract It has long been thought that collagen fibers within the bone matrix are deposited in an aligned pattern that channels mineral growth. If this model of bone structure is correct, both organic and inorganic phases of bone should have similar elastic anisotropy. Using an acoustic microscope, we measured longitudinal and transverse acoustic velocities of cortical specimens taken from 10 dog femurs before and after removal of either the mineral (using 10% EDTA) or collagen phases (using 7% sodium hypochlorite) and calculated longitudinal (CL) and transverse (CT) elastic coefficients. The anisotropy ratio (CL/CT) decreased significantly after demineralization (1.61 before versus 1.06 after, P〈0.0001, paired t-test). However, there was no significant change after decollagenization (1.51 before versus 1.48 after, P=0.617, paired t-test). We conclude that the orientation of mineral crystals is the primary determinant of bone anisotropy, and the collagen matrix within osteonal bone has little directional orientation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299319
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  • 3
    Electronic Resource
    Electronic Resource
    Simple inheritance of key traits distinguishing maize and teosinte (1996)
    Springer
    Molecular genetics and genomics 252 (1996), S. 33-41 
    Details
    ISSN: 1617-4623
    Keywords: Teosinte ; Maize ; Morphological traits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The segregation of key traits distinguishing maize and teosinte was analyzed in three F2 and three backcross populations derived from crosses of the modern maize inbred T232 withZea mays ssp.parviglumis. These traits were (i) paired vs. single female spikelets; (ii) two-ranked vs. many-ranked ears; (iii) non-indurated vs. indurated glumes; (iv) inclination of the kernels toward the rachis, and (v) distichous vs. polystichous central staminate spike. All traits showed a simple mode of inheritance except for paired female spikes, which appeared to be controlled by two genes. The loci controlling these major changes were mapped with RFLP markers to four chromosomal regions. These results support the suggestion that maize became differentiated from teosinte with as few as five major gene changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02173202
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  • 4
    Electronic Resource
    Electronic Resource
    Simple inheritance of key traits distinguishing maize and teosinte (1996)
    Springer
    Molecular genetics and genomics 252 (1996), S. 33-41 
    Details
    ISSN: 1617-4623
    Keywords: Key words Teosinte ; Maize ; Morphological traits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The segregation of key traits distinguishing maize and teosinte was analyzed in three F2 and three backcross populations derived from crosses of the modern maize inbred T232 with Zea mays ssp. parviglumis. These traits were (i) paired vs. single female spikelets; (ii) two-ranked vs. many-ranked ears; (iii) non-indurated vs. indurated glumes; (iv) inclination of the kernels toward the rachis, and (v) distichous vs. polystichous central staminate spike. All traits showed a simple mode of inheritance except for paired female spikes, which appeared to be controlled by two genes. The loci controlling these major changes were mapped with RFLP markers to four chromosomal regions. These results support the suggestion that maize became differentiated from teosinte with as few as five major gene changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004389670004
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  • 5
    Electronic Resource
    Electronic Resource
    Reproductive biology and spawning habitat supplementation of the relict darter, Etheostoma chienense, a federally endangered species (1999)
    Springer
    Environmental biology of fishes 55 (1999), S. 145-155 
    Details
    ISSN: 1573-5133
    Keywords: Percidae ; Catonotus ; artificial spawning substrate ; nesting biology ; fish conservation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We investigated the reproductive biology of Etheostoma chienense in the Bayou du Chien drainage of western Kentucky. Etheostoma chienense is similar in its ecology and reproductive biology to other members of the E. squamiceps complex. However, E. chienense is opportunistic in its choice of egg deposition substrates, as nests were found on a variety of natural and anthropogenic items. Due to an apparent lack of suitable spawning substrates, we added half-cylindrical ceramic tiles to several stretches of stream to increase potential nest productivity. Egg-clutches attached to artificial substrates were twice the size of egg clutches attached to naturally occurring materials. Laboratory experiments were conducted to determine nest rock size and mate choice preferences. Both the size of the male and of the nest rock appeared to be important parameters to spawning females. The life history information gathered here has significant management implications. Artificial spawning substrates should be placed in appropriate microhabitats (i.e., shallow, low-flow reaches in headwaters). Nest cavity vertical height should be about 3.0 cm and tiles should be spaced at least 0.5 m apart. We feel the use of surrogates (e.g., E. oophlyax) to investigate other types of spawning cover, and restoration of riparian buffer zones among other actions, would particularly benefit recovery efforts for this endangered species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007478906050
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