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Abstracts Of Papers Presented At The 84th Session Of The Iowa Academy Of Science, April 28-29, 1972, Iowa Academy Of Science

Iowa Academy of Science Documents

Presentation abstracts from the annual meeting of the Iowa Academy of Science

The Relationship Of Soil Temperature And Cytokinin Production In Aspen Invasion, Kristen R. Williams

Biology ETDs

Quaking aspen (Populus tremuloides Michx.) primarily reproduce by suckering (i.e., root sprouting). Numerous environmental variables have been suggested as causes of this phenomenon, the most notable of which is soil temperature. Studies demonstrating thermal regulation of sprouting indicate the involvement of growth hormones. The only class of hormones to elicit a response similar to sprouting is the cytokinins. Other hormones, no doubt, function in this process as well (e.g., auxins). To substantiate the idea that thermal regulation of sprouting is primarily a function of thermal regulation of cytokinin activity, and to determine the importance of other environmental factors in this …

Altitudinal Variation Of Chlorophyll Concentration And Reflectance Of The Bark Of Populus Tremuloides, William W. Covington

Biology ETDs

Chlorophyll concentration and reflectance of bark samples of Populus tremuloides Michx. growing at various elevations in the Sangre de Cristo mountain range of New Mexico indicate the appearance of greener barked trees at higher elevations is due to the reflectance characteristics of a bloom of dead periderm cells and not to increased chlorophyll concentrations. Chlorophyll concentration in aspen bark were, in fact, inversely correlated (p=.001) with altitude.

The higher concentration of chlorophyll at lower elevations is effectively masked by a white bloom which is also characteristic of exposed site trees. At higher elevations the bloom is yellow-brown and more translucent …

The Bottom Fauna Of Fish Lake, Utah And Its Relationship To The Trout Fishery, Dennis L. Shirley

Theses and Dissertations

One-hundred and three bottom samples taken at Fish Lake, Utah from July, 1969 to June, 1970 were analyzed to determine the abundance, distribution, and standing crop of the bottom fauna species and to relate their availability to the amount of food eaten by the trout. Twenty-three taxa, representing three phyla and 19 families were collected. An amphipod, Gammarus limnaeus, in the littoral zone, and a tubificid worm, Rhyacodrilus coccineus, in the sublittoral and profundal zones, were the most abundant species. All 23 species were unevenly distributed in the littoral zone, whereas, only eight were found in the sublittoral and five …

Analysis Of Asexual Reproduction Dugesia Dorotocephala, Harvey Dee Mecham

Theses and Dissertations

Genetic control of decapitation-induced fission in planaria is mediated by stimulator and inhibitor molecules. Resolution of the two factors was accomplished by filtration chromatography of whole planaria extract. The stimulator (M.W. 2500 to 3500) was purified with ion exchange chromatography and increases the multiple fission rate. The inhibitor (M.W. 20,000 to 50,000) is non-dialyzable, heat labile and is inactivated unless kept frozen. Storage at 4°C results in a loss of inhibitory capacity with a concomitant stimulator increase, suggesting a protein-stimulator complex as the inhibitor. In light of a demonstrated animal intercommunication system, the inhibitor-stimulator complex is hypothesized as part of …

Some Aspects Of The Ecology Of Perognathus Flavus, Dipodomys Ordi, And Dipodomys Merriami, L. Gwen Britt

Biology ETDs

A total of 3331 animals was trapped from August 1966 to September 1969. Three hundred and eighty-five marked P. flavus were captured 2058 times and 173 marked Dipodomys were captured 950 times. The mean population estimate for a year of study was 5.6 Dipodomys (two species) and 13.4 P. flavus per acre. There was an estimated biomass per acre of 97.8g for P. flavus and 262g for Dipodomys. Perognathu and Dipodomys hewed similar persistence curves with about half of the animals persisting for only 2 months. About 75% of the animals were gone after 6 months with a few persisting …

Front Matter, Vol. 16 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Understory Characteristics Related To Site Quality For Aspen In Utah, James H. Warner, Kimball T. Harper

Brigham Young University Science Bulletin, Biological Series

An analysis has been made of the basic ecology of aspen forests of the mountainous areas of Utah and northern Arizona. Forty-nine study areas have been examined in respect to density, height and age of the tree cover, tree reproduction, and composition and biomass production of the understory. A graphic model of interspecific assocations among prevalent understory species has been prepared by a cluster-analysis procedure based on presence and absence of species in 1,225 small quadrats (0.25 m²) uniformly distributed among the 49 stands. The model separates species of relatively stable as opposed to rapidly seral aspen forests. …

The Algal Flora (Excluding Class Bacillariophyceae) Of Foster's Pond, Allen County, Kentucky, Linda Garrett

Masters Theses & Specialist Projects

A systematic survey of the algal flora (excluding Class Bacillariophyceae) of Foster's Pond, Allen County, Kentucky, was conducted from January 29, 1970, to March 25, 1971. Physical and chemical data were taken in order to characterize the quality of the water and examine its relationships to floral composition and periodicity insofar as the level of discrimination employed permitted.

A total of 119 taxa representing five divisions were identified. Twenty-five of these were previously unreported for the State of Kentucky.

Members of the Division Chlorophyta, which composed 66.4% of all the identified taxa, dominated the flora throughout the year. Desmid and …

End Matter, Vol. 16 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Methodological And Validation Study Of Seed Reserves In Desert Soils, David W. Goodall, Stuart Childs, Herman Wiebe

Memorandum

The development of a method for separating seeds from desert soils, and enumerating them, is described.

In the Great Basin desert, species differed greatly in their depth distribution, some having a peak at or just below the surface, while others were still abundant below 5 cm. Much higher seed densities were found beneath the canopies of shrubs and of tussock grasses than in the inter-spaces; no consistent differences were found, however, associated with the species of the canopy plant, or with distance from its center.

Tentative estimates are given of the seed population in the four validation sites in Curlew …

Evaluation Of Four Systemic Insecticides Against The Cottonwood Twig Borer, Jack E. Coster, Robert G. Merrifield, R.A. Woessner

Faculty Publications

No abstract provided.

The Phyllostomatid Bat, Vampyressa Brocki, In Colombia, Robert J. Baker, Hugh H. Genoways, Alberto Cadena

University of Nebraska State Museum: Mammalogy Papers

Between June 28 and July 1, 1969, while conducting studies on the karyotypes of phyllostomatid bats, the authors collected three specimens of Vampyressa brocki in mature tropical rainforest at Leticia, Amazonas. Colombia. Measurements and representative karyotypes are presented.

An Electron Microscopical Study Of The Ultrastructure And Classification Hemocyte Of The Grasshopper, Melanoplus Differentials (Thomas) (Orthoptera: Acrididae), Andrejs Liepins

Masters Theses

The hemocytes of the fifth instar nymphs of the grasshopper Melanoplus differentialis (Thomas) (Orthoptera: Acrididae) have been the subject of this study. The hemocytes of this insect, based on the fine structures of its cells, have been found to fall into four main categories or groups: Nucleocytes, Plasmatocytes, Granulocytes and Coagulocytes. The bases for their classification are differences in the ultrastructure of the cytoplasmic organelles as well as cytoplasmic inclusions are revealed as revealed by electron microscopy.

South Dakota Farm And Home Research, Agricultural Experiment Station, South Dakota State University

South Dakota Farm and Home Research: 1949 -1998

Water Bank Program [p] 2
Siberian elm Canker [p] 3
Conservation Tillage [p] 5
Sawdust as Roughage [p] 9
Electron Microscope [p] 14
Air Pollution [p] 18
1972 summer field Days [p] 23

A Survey Of Fresh-Water Oligochaeta And Their Commensal Ciliates From The Richmond, Virginia Area, Elsa Queen Falls

Master's Theses

The distribution of North American aquatic oligochaetes and the ciliates inhabiting their guts have received very limited attention. For this reason, the present study was initiated to survey fresh ­water oligochaetes of the families Aeolosomatidae, Naididae, Opistocystidae, and Lumbriculidae in four bodies of water of the Richmond, Virginia area and to determine the incidence of commensal ciliates within the gut .

Membrane Bound Nadh Oxidase Complex Of Micrococcus Lysodeikticus, Karen Ju-Kuang Hsia

Masters Theses

No abstract provided.

Abstract Papers

Journal of the Minnesota Academy of Science

No abstract provided.

Captan-Induced Reversions In Bacteria, Gayle M. Nii Lopiccolo

Masters Theses

No abstract provided.

Plant Succession In The Great Dismal Swamp Of Virginia, Susan Woodward Walker

Biological Sciences Theses & Dissertations

Vegetational composition and environmental parameters were analyzed. for 14 stands. Cluster diagrams based on index of similarity values illustrated interstand relationships. The Index of Fluctuation was developed for the analysis of intrastand dynamics. Based on the densities and numbers of species of trees and saplings within a stand, it indicated degree of compositional stability. It was concluded that present vegetation is divided into relatively distinct communities which have resulted, at least in part, from disturbance.

The Effects Of The Cyclic 3'5'-Monophosphate Of Adenosine And Its Dibutyryl Derivative On The In-Vitro Immunization Of Mouse Spleen Cell Suspensions, James A. Blanks

Biological Sciences Theses & Dissertations

Abstract unavailable.

Diurnal Studies At A Station On An Urban Estuary In Norfolk, Virginia, Burton Marc Golue

Biological Sciences Theses & Dissertations

No abstract.

The Effects Of Moist-Heat Treatments And Stratification On Germination Of Prairie Plant Seeds, John E. Stuurwold

Honors Theses

Germination of Silphium terebinthenaceum was enhanced by a post-stratification most-heat treatment at 80°C. Tested seeds of four other perennial herbs common to midwestern prairies (Andropogon scoparius, Sorghastrum nutans, Eryngium yuccifolium, and Solidago rigida) showed little adverse or beneficial effects of the heat treatment. Heat treatments alone had little effect on the seeds; the length of stratification periods necessary to effect maximal germination varied. The significance of these findings is examined in the light of related literature on grassland fire ecology.

A Comparative Consideration Of Lipoprotein Distribution And Stress Response In The Mallard Duck And Man, Janice Mackay

Honors Theses

Lipid is associated with all of the major serum protein fractions of both the mallard duck and man. however, whereas the ρ lipoproteins predominate in man with little lipo-albumin evident, according to available literature, in ducks the lipo-albumin constitutes more than half of the serum lipoproteins, and a substantial lipo-prealbumin fraction is evident. Most studies of lipo-proteins are carried out on human serum primarily for the purpose of diagnosis of abnormalities. The stress response in many animals includes a rise in serum α-globulin levels, but its physiological basis is still speculative. While a consideration of the changes in lipoprotein distribution …

Purification And Properties Of Phenylalanine Transfer Rna From Bacillus Licheniformis And Bacillus Stearothermophilus, Cynthia R.Y. Yang

Dissertations

No abstract provided.

Euryhelmis Cotti N. Sp. (Trematoda: Heterophyidae) With Observations On Its Life Cycle, Michael Joseph Simon

Dissertations and Theses

Fish of the genus Cottus were found infected with heterophyid metacercariae. Laboratory animals were infected with the metacercariae, and adult heterophid trematodes were recovered. These flukes were found to represent an undescribed species of the genus Euryhelmis. Various streams in the Willamette Valley and coastal areas were sampled for infected Cottus sp. Snails of the genera Oxytrema and Fluminicola were collected. Several possible definitive hosts were examined. A partial review of the subfamily Apophallinae and a complete review of the genus Euryhelmis are presented. Euryhelmis cotti n. sp. is placed in the subfamily Apophallinae, and its life cycle …

Variation And Ecology In A Local Population Of The Vesper Mouse (Nyctomys Sumichrasti), Hugh H. Genoways, J. Knox Jones Jr.

University of Nebraska State Museum: Mammalogy Papers

Vesper mice of the genus Nyctomys are relatively rare, arboreal rodents restricted to Middle America (eastern Panama to southern Mexico). Little is known concerning the biology of these secretive animals. Studies of variation of the one species, Nyctomys sumichrasti, have been limited to descriptions of new taxa (for example, see Goldman, 1916, 1937, and Laurie, 1953) and ecological observations have been confined to faunal accounts of political units (Goodwin, 1934; Hall and Dalquest, 1963) or were made coincidental to studies of other species (Lawlor, 1969; Fleming, 1970). Birkenholz and Wirtz (1965) recorded observations on the behavior, reproduction, and early …

1972 Little International Agricultural Exposition Catalog, Little International Agricultural Exposition South Dakota State University

Little International "Little I" Agricultural Exposition Catalogs

No abstract provided.

Protein Catabolism And Urea Utilization In Water-Deprived And Fasted Ground Squirrels And Rats, Gerald L. Rigler

Biology ETDs

The objective of this study was to examine a specific metabolic adaptation, namely, the extent to which protein catabolism was changed in long-term water-deprived and starved Spennophilus lateralis, S. spilosoma, and laboratory rats. It was thought from previous studies that the relative amount of protein and fat catabolism affects water balance and thus determines how long an animal will survive water deprivation. Hibernators may possess unique metabolic flexibility in adapting to water deprivation as they apparently adapt to dehydration when they are hibernating.

In the first series of experiments animals· were water deprived for 6 days at 2 seasons and …

The Effect Of Hibernation On Memory In Spermophilus Lateralis, Mary Colleen Mcnamara

Biology ETDs

Spermophilus lateralis, were trained to solve a black-white discrimination task in order to escape from a water filled tank. Following the attainment of criterion, the ground squirrels were trained on the reversal task of the original discrimination problem. Twenty-four hours after reaching criterion on the reversal training, all subjects were placed in a hibernaculum at 7-10 C for a period of 11 days. The animals were returned to the laboratory after the 11-day

cold exposure period, and 24 hr later were tested for retention of the learned behavior. The animals were returned to the hibernaculum for an additional 11 days …