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Full-Text Articles in Life Sciences
Effects Of Litter On Aquatic Macrophyte Germination And Growth, Mark F. Carter, Forrest E. Lane, James B. Grace
Effects Of Litter On Aquatic Macrophyte Germination And Growth, Mark F. Carter, Forrest E. Lane, James B. Grace
Journal of the Arkansas Academy of Science
In Arkansas, during seasonal drought periods, lake water levels drop leaving exposed mudflats which are primary sites for seedling establishment. Commonly, these exposed mudflats are partially covered with decomposing litter from previous stands of aquatic plants. In this study, aqueous leachates from the litter of four macrophytes, Eleocharis quadrangulata, Justicia americana, Polygonum lapathifolium, and Potamogeton nodosus, were used to test for chemical interference with germination and seedling growth. Only Justicia americana leachate was found to affect the growth of several of the test species. The potential for chemical interference by Justicia litter was evaluated further using extracts of acidified leachate. …
Southern Woodfern, Dryopteris X Australis, New To Arkansas, Steve L. Orzell, James H. Peck
Southern Woodfern, Dryopteris X Australis, New To Arkansas, Steve L. Orzell, James H. Peck
Journal of the Arkansas Academy of Science
No abstract provided.
Observations And New Records Of Ferns Naturalizing In Arkansas, James H. Peck, Lance Peacock, William M. Shepherd
Observations And New Records Of Ferns Naturalizing In Arkansas, James H. Peck, Lance Peacock, William M. Shepherd
Journal of the Arkansas Academy of Science
No abstract provided.
Effects Of Gamma Radiation On Salix Nigra Marsh Cuttings, Roy Z. Gehring
Effects Of Gamma Radiation On Salix Nigra Marsh Cuttings, Roy Z. Gehring
Journal of the Arkansas Academy of Science
Dormant cuttings of Salix nigra Marsh, were exposed to gamma radiation from a cobalt-60 source at a dose rate of 1110 roentgens (r) per minute. Exposure doses ranged from 50 r through 100 Kr with 100% mortality at 10 Kr. Low doses of ionizing radiation apparently stimulated growth, while higher doses progressively retarded growth. The growth of the staminate catkins was inversely proportional to total exposure dose (increased dose resulted in progressively decreased growth). Determination of growth rates at different intervals post-irradiation indicated recovery of the surviving fraction of the irradiated cuttings. At ninety days, the highest growth rate occurred …
Effects Of Growth Temperatures On The Fatty Acid Composition Of Isolated Chloroplasts From Two Species Differing In Heat Sensitivity, Roy Z. Gehring, Glenn W. Todd
Effects Of Growth Temperatures On The Fatty Acid Composition Of Isolated Chloroplasts From Two Species Differing In Heat Sensitivity, Roy Z. Gehring, Glenn W. Todd
Journal of the Arkansas Academy of Science
Lipid analyses of chloroplasts isolated from wheat (Triticum aestivum L. cv. Arthur) and milo (Sorghum bicolor cv. Funk's hybrid 522) suggest no major heat effect on lipid class distribution. Assuming milo is more heat tolerant than wheat and that increased saturated/unsaturated fatty acid values increase thermal stability, changes in sulfoquinovosyldiglyceride (SL) appear to be more important than phosphatidylglycerol (PG) in conferring thermal stability to isolated chloroplasts.
Louisiana Log Fern (Dryopteris Ludoviciana) New To Arkansas, James H. Peck, Eric Sundell, Carol J. Peck
Louisiana Log Fern (Dryopteris Ludoviciana) New To Arkansas, James H. Peck, Eric Sundell, Carol J. Peck
Journal of the Arkansas Academy of Science
No abstract provided.
New And Interesting Plants For The Arkansas Flora, Edward Leon Richards
New And Interesting Plants For The Arkansas Flora, Edward Leon Richards
Journal of the Arkansas Academy of Science
No abstract provided.