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48 Matching Results
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48
Amblema plicata, Specimen #140
One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; thick shell; single looped beak sculpturing; white internal coloring; brown external coloring; external sculpturing in the form of ridges. Collected in the Brazos basin. The specimen measures between 60 - 100 mm in length and was assessed to be relatively-recently dead when collected.
Date:
August 28, 1980
Creator:
Golightly, C. & Moorhead, D.
Object Type:
Specimen
System:
The UNT Digital Library
Amblema plicata, Specimen #141
One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; thick shell; single looped beak sculpturing; purplish-white internal coloring; brown external coloring; external sculpturing in the form of ridges. Collected in the Brazos basin. The specimen measures between 60 - 100 mm in length and was assessed to be recently dead when collected.
Date:
August 28, 1980
Creator:
Golightly, C. & Moorhead, D.
Object Type:
Specimen
System:
The UNT Digital Library
Amblema plicata, Specimen #142
One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; thick shell; single looped beak sculpturing; white internal coloring; dark brown external coloring; external sculpturing in the form of ridges. Collected in the Brazos basin. The specimen measures between 60 - 100 mm in length and was assessed to be relatively-recently dead when collected.
Date:
August 28, 1980
Creator:
Golightly, C. & Moorhead, D.
Object Type:
Specimen
System:
The UNT Digital Library
Pyganodon grandis, Specimen #888
One preserved mussel specimen including both the left and right valves. The specimen exhibits an elliptical shape; thin shell; double looped beak sculpturing; bluish-white internal coloring; dark brown external coloring; no external sculpturing. Collected in the Brazos basin. The specimen measures between 100 - 120 mm in length and was assessed to be relatively-recently dead when collected.
Date:
August 28, 1980
Creator:
Golightly, C.
Object Type:
Specimen
System:
The UNT Digital Library
Pyganodon grandis, Specimen #889
One preserved mussel specimen including both the left and right valves. The specimen exhibits an elliptical shape; thin shell; double looped beak sculpturing; bluish-white internal coloring; reddish-brown external coloring; no external sculpturing. Collected in the Brazos basin. The specimen measures over 120 mm in length and was assessed to be relatively-recently dead when collected.
Date:
August 28, 1980
Creator:
Golightly, C.
Object Type:
Specimen
System:
The UNT Digital Library
Potamilus purpuratus, Specimen #725
One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; thick shell; purple internal coloring; reddish-brown external coloring; no external sculpturing. Collected in the Brazos basin. The specimen measures over 120 mm in length and was assessed to be recently dead when collected.
Date:
October 4, 1980
Creator:
Golightly, C. & Moorhead, D.
Object Type:
Specimen
System:
The UNT Digital Library
Potamilus purpuratus, Specimen #726
One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; thick shell; pink internal coloring; dark brown external coloring; no external sculpturing. Collected in the Brazos basin. The specimen measures between 100 - 120 mm in length and was assessed to be recently dead when collected.
Date:
October 4, 1980
Creator:
Golightly, C. & Moorhead, D.
Object Type:
Specimen
System:
The UNT Digital Library
Potamilus ohiensis, Specimen #728
One preserved mussel specimen including both the left and right valves. The specimen exhibits an oval shape; pink internal coloring; brown external coloring; no external sculpturing. Collected in the Brazos basin. The specimen measures over 120 mm in length and was assessed to be relatively-recently dead when collected.
Date:
October 4, 1980
Creator:
Golightly, C. & Moorhead, D.
Object Type:
Specimen
System:
The UNT Digital Library
Potamilus ohiensis, Specimen #727
One preserved mussel specimen including both the left and right valves. The specimen exhibits an oval shape; white internal coloring; brown external coloring; no external sculpturing. Collected in the Brazos basin. The specimen measures over 120 mm in length and was assessed to be relatively-recently dead when collected.
Date:
October 4, 1980
Creator:
Golightly, C. & Moorhead, D.
Object Type:
Specimen
System:
The UNT Digital Library
Effects of Water Source, Suspended Solids, and Acclimation on Biotransformation of 2 /4-Dichlorophenoxy Acetic Acid in Aquatic Systems
In recent years there has been a great deal of scientific interest in processes that affect the fate of organic chemicals in the environment. one main reason for this increased interest is due to greater environmental concern over accidental or purposeful release of these chemicals into the environment by man. A major environmental concern is the increased use of pesticides over the last few years. In the thirty years prior to 1978 the use of pesticides has increased by a factor of forty (Ridgeway et al., 1978). Recently the use of herbicides has been increasing, but that of insecticides has stabilized (Willis, 1983). Detectable amounts of organic pesticides can be found in many areas of the biosphere. For toxic organic chemicals to be used safely, researchers must have a clear understanding of the fate and persistence of these chemicals when they are released into the environment. This understanding will also allow the development of new products that, when properly used, will not produce adverse effects to man or the environment (Weber, 1972). According to the Toxic Substance Control Act (TSCA) any new or expanded-use chemical that might be released into the environment must be tested for environmental hazard.
Date:
August 1985
Creator:
Moses, Christopher K. (Christopher Karam)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Size Fractionation of Metabolically Active Phytoplankton and Bacteria in Two Diverse Lentic Systems
Simultaneous size fractionation of plankton populations associated with NaH^14CO_3 and ^3H-glucose uptake was employed in eutrophic Lake Texoma (Texas and Oklahoma) and oligotrophic Flathead Lake (Montana). Autoradiography was utilized to determine the role of specific microorganisms in community metabolism. Ultraplankton (0.45-10 μm) dominated plankton numbers and metabolic activity in both aquatic systems. Many of the most abundant species were not the most productive, in terms of inorganic C fixation. Rates of heterotrophic uptake of ^3H-glucose were small in comparison to photolithotrophic uptake in both lakes, Photoheterotrophy was more extensive in Flathead Lake, Autoradiographs indicated that bacteria were responsible for observed photoheterotrophy. Oscillatoria sp. exhibited. mixotrophy in Lake Texoma,
Date:
August 1980
Creator:
Ellis, Bonnie K.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Quantitative Studies of Inhibitors of ADP-ribosylation in Vitro and in Vivo
Article evaluating the selectivity of compounds originally identified as inhibitors of poly(ADP-ribose) polymerase on members of the three classes of enzymes. The results suggest that micromolar levels of the benzamides in the culture medium should allow selective inhibition of poly(ADP-ribose) metabolism in intact cells. Furthermore, comparative quantitative inhibition studies should prove useful for assigning the biological effects of these inhibitors as an effect on either poly(ADP-ribose) or mono(ADP-ribose) metabolism.
Date:
March 15, 1989
Creator:
Rankin, Patrick W.; Jacobson, Elaine L.; Benjamin, Robert C.; Moss, Joel & Jacobson, Myron K.
Object Type:
Article
System:
The UNT Digital Library
Plasmids of Azotobacter vinelandii
Article on the plasmids of Azotobacter vinelandii.
Date:
April 1988
Creator:
Maia, Mauricio; Sanchez, Juan M. & Vela, G. Roland, 1927-
Object Type:
Article
System:
The UNT Digital Library
Biosynthesis of Isoflavonoid Phytoalexins: Incorporation of Sodium [1,2-(13)C2] Acetate into Phaseollin and Kievitone
Article on the biosynthesis of isoflavonoid phytoalexins and the incorporation of sodium [1,2-(13)C2] acetate into phaseollin and kievitone.
Date:
June 1982
Creator:
Dewick, Paul M. & Steele, Melanie J.
Object Type:
Article
System:
The UNT Digital Library
Growth of Azotobacter vinelandii on Soil Nutrients
Article on the growth of Azotobacter vinelandii on soil nutrients.
Date:
March 1, 1987
Creator:
Wu, Fang Jy; Moreno, Joaquin & Vela, G. Roland, 1927-
Object Type:
Article
System:
The UNT Digital Library
Cyanase-Mediated Utilization of Cyanate in Pseudomonas fluorescens NCIB 11764
Article on cyanase-mediated utilization of cyanate in Pseudomonas fluorescens NCIB 11764.
Date:
January 1, 1989
Creator:
Kunz, Daniel A. & Nagappan, Olagappan
Object Type:
Article
System:
The UNT Digital Library
Remote Sensing and GIS for Nonpoint Source Pollution Analysis in the City of Dallas' Western Watersheds
This report describes the findings of a study conducted on the watersheds of "Lake Lewisville, Lake Ray Roberts, Lake Grapevine and the Elm Fork of the Trinity River between Lake Lewisville and Frazier Dam," which are all part of the upper Trinity drainage basin (p. 31). The study examines the potential benefit of "remote sensing and geographic information systems (GIS) for watershed management" in and around Dallas, Texas (p. i).
Date:
August 1988
Creator:
University of North Texas. Department of Biological Sciences.
Object Type:
Book
System:
The UNT Digital Library
Remote Sensing and GIS for Nonpoint Source Pollution Analysis in the City of Dallas' Eastern Watersheds
This report describes the findings of a study conducted on the Eastern Watersheds of Lake Lavon, Lake Ray Hubbard, Lake Tawakoni, Lake Palestine and Lake Fork, which are located within the Blackland Prairie, Post Oak Savannah and Pineywoods provinces. These watersheds are among nine that provide drinking water to Dallas, Texas. The study examines the potential benefit of "remote sensing and geographic information systems (GIS) for watershed management" in these five watersheds (p. iii).
Date:
June 1989
Creator:
University of North Texas. Department of Biological Sciences.
Object Type:
Book
System:
The UNT Digital Library
Dose Responses for Colletotrichum lindemuthianum Elicitor-mediated Enzyme Induction in French Bean Cell Suspension Cultures
Article on dose responses for Colletotrichum lindemuthianum elicitor-mediated enzyme induction in French bean cell suspension cultures.
Date:
March 1981
Creator:
Dixon, R. A.; Dey, P. M.; Murphy, D. L. & Whitehead, I. M.
Object Type:
Article
System:
The UNT Digital Library
Survival of Azotobacter spp. in Dry Soils
Article on the survival of Azotobacter spp. in dry soils.
Date:
January 1, 1986
Creator:
Moreno, Joaquin; Gonzalez-Lopez, J. & Vela, G. Roland, 1927-
Object Type:
Article
System:
The UNT Digital Library
Effects of Chemicals on People and the Environment
In this pamphlet, the author will examine some of the benefits of chemicals to mankind. The author also will examine some of the problems chemicals have caused, are causing and may cause in the future.
Date:
March 1984
Creator:
Dickson, Kenneth L.
Object Type:
Pamphlet
System:
The UNT Digital Library
The specificity of plant defences
This article discusses the specificity of plant defences.
Date:
January 10, 1980
Creator:
Dixon, R. A. & Lamb, Christopher J.
Object Type:
Article
System:
The UNT Digital Library
Modulation of L-Phenylalanine Ammonia-Lyase by Pathway Intermediates in Cell Suspension Cultures of Dwarf French Bean (Phaseolus vulgaris L.)
Article on the modulation of L-phenylalanine ammonia-lyase by pathway intermediates in cell suspension cultures of dwarf French bean (Phaseolus vulgaris L.).
Date:
December 1980
Creator:
Dixon, R. A.; Browne, T. & Ward, John M.
Object Type:
Article
System:
The UNT Digital Library
Arcidens confragosus, Specimen #1604
One preserved mussel specimen including both the left and right valves. The specimen exhibits an oval shape; moderately thick shell; white internal coloring; reddish-brown external coloring; no external sculpturing. Collected in the Trinity basin. The specimen measures between 100 - 120 mm in length and was assessed to be relatively-recently dead when collected.
Date:
1981
Creator:
Kennedy, James
Object Type:
Specimen
System:
The UNT Digital Library