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Full-Text Articles in Life Sciences
Sea Urchins From The Brazos Santiago Pass Jetty, South Padre Island, Richard R. Fairchild, Lazern O. Sorensen
Sea Urchins From The Brazos Santiago Pass Jetty, South Padre Island, Richard R. Fairchild, Lazern O. Sorensen
Biology Faculty Publications and Presentations
Data on occurrence and distribution of sea urchins (Echinoidea) are presented for the Brazos Santiago Pass jetty on South Padre Island, Texas. Echinometra lucunter is recorded from the Texas coast.
Factors Influencing Cellulolytic Activity Of The Soil Fungus, Aspergillus Candidus, Jacobo Ortega, Ernest J. Baca
Factors Influencing Cellulolytic Activity Of The Soil Fungus, Aspergillus Candidus, Jacobo Ortega, Ernest J. Baca
Biology Faculty Publications and Presentations
Effects of pH, incubation time, nitrogen source and carbohydrate source upon production of carboxymethyl cellulase by Aspergillus candidus grown in liquid medium were studied. Maximal cellulase activity per unit of protein occurred in culture fluids with a pH of 5.5, after 10 days of cultivation of the fungus. Ammonium nitrate supported the highest production of the enzyme. However, in the nitrogen-source test, highest accumulation of extracellular protein was found in fluids from cultures with urea as the nitrogen source. Cotton fibers produced the greatest gain in cellulase activity when the carbohydrate source was incremented from 0.5 to 1.0 percent. The …
Effects Of A Severe Freeze On Native Woody Plants In The Lower Rio Grande Valley, Texas, Robert I. Lonard, Frank W. Judd
Effects Of A Severe Freeze On Native Woody Plants In The Lower Rio Grande Valley, Texas, Robert I. Lonard, Frank W. Judd
Biology Faculty Publications and Presentations
The effects of a severe freeze in December, 1983 on the native plants of the lower Rio Grande Valley, Texas were determined for 75 species. Damage was initially assessed by examining leaves, apical meristems, and cambial tissues of stems. Initial assessments were confirmed by surveys in the spring when new leaves were present. Forty-three species were either undamaged or had only minor leaf damage. Twenty-two species with damaged leaves had intact apical meristems or showed evidence of damage for less than 10 cm below the apical meristem. Three species, Leucaena pulverulenta, Cordia boissieri, and Karwinskia humboldtiana, had more extensive damage, …