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Non-random distribution patterns of leaf miners on oak trees (1987)

Stiling, P. D. ; Simberloff, D. ; Anderson, L. C.

Springer

Oecologia 73 (1987), S. 116-119

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ISSN: 1432-1939

Keywords: Leaf miner ; Stilbosis ; Oak trees ; Quercus geminata ; Mine distributions ; Abscission

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Leaf-mining Stilbosis quadricustatella larvae are distributed non-randomly within leaves of their host plants, sand live oak (Quercus geminata) and water oak (Q. nigra), in north Florida. Fewer mines are found together on the same side of the mid-vein than separated, on opposite sides of the mid-vein. Larvae do not normally cross the mid-vein but create small blotch-like mines along subsidiary veins. Investigations of the usual mortality factors acting on these leaf-miner populations, including competition, parasitism, and predation, revealed no significant differences in these factors between mines separated by the mid-vein and those on the same side of the leaf. However, early leaf abscission, which kills the larvae present in the leaf, occurs significantly more frequently in cases where larvae are clustered on one leaf side. The reasons for this differential leaf abscission are not yet clear.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00376986

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Small-angle x-ray scattering by poly-L-alanine solutions (1972)

Brumberger, H. ; Anderson, L. C.

New York : Wiley-Blackwell

Biopolymers 11 (1972), S. 679-682

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ISSN: 0006-3525

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The radius of gyration and “persistence length” of poly-L-alanine, calculated from small-angle x-ray scattering data, have values of 56 Å and 44 Å, respectively, in dichloroacetic acid, and 78 Å and ∼30 Å in a 1:1 v/v mixture of trifluoroacetic acid and trifluoroethanol. This can be interpreted to mean that poly-L-alanine exists in a relatively rigid, predominantly α-helical conformation in dichloroacetic acid and in an extended, more flexible form in the mixed solvent system.

Additional Material: 2 Ill.