Life Sciences Commons^™

Arrangement Of Subunits In Microtubules With 14 Profilaments, George M. Langford

Biology - All Scholarship

The structure of 14-protofilament microtubules reassembled from dogfish shark brain tubulin was analyzed by high resolution electron microscopy and optical diffraction. The simultaneous imaging of the protofilaments from near and far sides of these tubules produces a moiré pattern with a period of approximately 96 nm. Optical diffraction patterns show that the 5-nm spots that arise from the protofilaments for the two sides of the tubule are not coincident but lie off the equator by a distance of 1/192 nm-1. These data provide evidence that in reassembled microtubules containing 14 protofilaments, the protofilaments are tilted 1.5 degrees with respect to …

Ec17-11-80 Nebraska Outdoor Education Series: Plant A Tree, Joe Range, John D. Orr

University of Nebraska-Lincoln Extension: Historical Materials

Not all trees or shrubs can find a home in your yard or apartment. Help your child to discover a home for the tree or shrub he or she grows or receives. The greatest benefit of this Plant-A-Tree project is being close to a living plant. This project will: introduce five tree planters - one from each area of Nebraska, discuss the parts of tree seeds, give examples of how tree seeds travel, discuss preparation of soil, demonstrate how to grow a seedling tree from seed, demonstrate how to transplant a tree, and offer suggestions for activities and exhibits.

Polymorphisms, Linkage And Mapping Of Four Enzyme Loci In The Fish Genus Xiphophorus (Poeciliidae), D C Morizot, M J Siciliano

Faculty, Staff and Student Publications

Electrophoretic variants at four additional enzyme loci--two esterases (Est-2, Est-3), retinal lactate dehydrogenase (LDH-1) and mannose phosphate isomerase (MPI)--among three species and four subspecies of fish of the genus Xiphophorus were observed. Electrophoretic patterns in F1 hybrid heterozygotes confirmed the monomeric structures of MPI and the esterase and the tetrametric structure of LDH in these fishes. Variant alleles of all four loci displayed normal Mendelian segregation in backcross and F2 hybrids. Recombination data from backcross hybrids mapped with Haldane's mapping function indicate the four loci to be linked as Est-2--0.43--Est3--0.26--LDH-1--0.19--MPI. Significant interference was detected and apparently concentrated in the Est-3 …

Sightings Of Moose, Deer, And Bears On Roads In Northern Ontario, D. Fraser

Anthropogenics and Population Decline Collection

No abstract provided.

Motility Of The Microtubular Axostyle In Pyrsonympha, George M. Langford, Shinya Inoué

Biology - All Scholarship

The rhythmic movement of the microtubular axostyle in the termite flagellate, Pyrsonympha vertens, was analyzed with polarization and electron microscopy. The protozoan axostyle is birefringent as a result of the semi-crystalline alignment of approximately 2,000 microtubules. The birefringence of the organelle permits analysis of the beat pattern in vivo. Modifications of the beat pattern were achieved with visible and UV microbeam irradiation. The beating axostyle is helically twisted and has two principal movements, one resembling ciliary and the other flagellar beating. The anterior portion of the beating axostyle has effective and recovery phases with each beat thereby simulating the flexural …

Bulletin No. 23: Plants And Animals Of The Estuary, William A. Niering, Paul E. Fell, Sally L. Taylor, Martine Villalard-Bohnsack, Nancy C. Olmstead

Bulletins

Descriptions and illustrations of over 70 estuarine species.

A Survey Of Plants And Animals Of Hill And Wendover Bombing Ranges, Western Utah, Mary Sue Fisher

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

The United States Air Force was required by the Sikes Act (16 USC 670 et seq.) to operate Hill and Wendover Bombing Ranges under a Land and Wildlife Management Plan consistent with military objectives. A preliminary biological inventory was conducted to provide basic information necessary for preparation of an appropriate management plan. The inventory was conducted over a one year period utilizing 60 field days on the ground and 30 hours of flying time. A list of vertebrates present on the bombing ranges was formed by general observation of large mammals, birds and reptiles, and trapping of small mammals. …

The Effect Of Browsing By Cattle And Sheep On Trees And Bushes, J. Buttenschon, R.M. Buttenschon

Aspen Bibliography

No abstract provided.

Three Linked Enzyme Loci In Fishes: Implications In The Evolution Of Vertebrate Chromosomes, D C Morizot, D A Wright, M J Siciliano

Faculty, Staff and Student Publications

A three-point linkage group comprised of loci coding for adenosine deaminase (ADA), glucose-6-phosphate dehydrogenase (G6PDH), and 6-phospho-gluconate dehydrogenase (6PGD) is described in fish of the genus Xiphophorus (Poeciliidae). The alleles at loci in this group were shown to assort independently from the alleles at three other loci--isocitrate dehydrogenase 1 and 2, and glyceraldehyde-3-phosphate dehydrogenase 1. Alleles at the latter three loci also assort independently from each other. Data were obtained by observing the segregation of electrophoretically variant alleles in reciprocal backcross hybrids derived from crosses between either X. helleri guentheri or X. h. strigatus and X. maculatus. The linkage component …

Bulletin No 3966 - Vitamin A And Animal Health, J. Johnson

Bulletins - 3000 - 3999

Vitamin A is one of the essential vitamins for animal health. Grazing animals obtain their vitamin A requirements mostly from the carotene in green feed. This carotene is converted to Vitamin A in the intestinal wall and is passed to the liver and to a less extent the kidneys for storage. Some carotene also passes direct to the liver where it is stored before it is converted to vitamin A.

When dry pastures, hay and grains (except maize) are low in carotene content this ability of the animals to store vitamin A means that they usually have enough when there …

Federal And State Regulations Pertaining To Systematic Collections. I. A Case Of Inadvertent Violation Of Federal Regulations, Jerry R. Choate, Hugh H. Genoways

University of Nebraska State Museum: Mammalogy Papers

On 25 April 1975, at the twenty-second annual meeting of the Southwestern Association of Naturalists (SWAN), at the University of Oklahoma Biological Station, President Keith A. Arnold appointed Jerry Choate to investigate current regulations pertaining to collection and transport of scientific specimens in the region of representation (including Mexico) or SWAN. This charge involves both Federal and State laws, several of which are undergoing change and many of which doubtlessly are not familiar to the membership of SWAN. In order that SWAN members might be made aware of these regulations and not unwittingly commit violations, it was decided that SWANEWS …

Induced Changes In The Rates Of Uridine-3H Uptake And Incorporation During The G1 And S Periods Of Synchronized Chinese Hamster Cells, Peter J. Stambrook, Jesse E. Sisken

Biology Faculty Publications

The rates of uridine-5-³H incorporation into RNA and the rates of uridine uptake into the acid-soluble pool during the cell cycle of V79 Chinese hamster cells were examined. Cells cultured on Eagle's minimal essential medium supplemented with fetal calf serum, lactalbumin hydrolysate, glutamine, and trypsin displayed rates of incorporation and uptake which increased only slightly during G₁ and accelerated sharply as DNA synthesis commenced. In contrast, cells cultured on minimal essential medium supplemented only with calf serum exhibited rates of incorporation and uptake which increased linearly through both G₁ and S. The transition from one pattern …

Aspects Of The Oculomotor System Of Callinectes Sapidus, Antoinette Steinacker

University of the Pacific Theses and Dissertations

An isolated perfused preparation was developed for the study of several aspects of the oculomotor system of the blue crab, Callinectes sapidus. The system for eyestalk rotation was investigated on an extracellular level. Two antagonistic pairs of muscles under visual and statocyst control were found to be responsible for stabilization and rotation of the eyestalk. The primary sensory input to the muscles appears to be from the statocysts, with both static position sense and dynamic acceleration components influencing the motor response. Two sensory feedback systems from mechanoreceptive hairs were found which influence the response of the eye stalks to statocyst …

A Taxonomic Comparison To Uta Stansburiana Of The Great Basin And The Upper Colorado River Basin In Utah, Lloyd C. Pack

Theses and Dissertations

The lack of a comparative study between the Uta stansburiana of the Great Basin and Upper Colorado River Basin, and the fact that several reptile species have developed distinct populations in the Upper Colorado River Basin prompted this study. Twenty-one external characteristics of these lizards were compared, including several which had not been previously used in the separation of Uta stansburiana into subspecies. All of the statistical data were obtained from preserved specimens. Twelve of the twenty-one characteristics show significant differences between the Great Basin and Upper Colorado River Basin populations. The characteristics of back pattern and throat color show …

Why Does Second-Cutting Red Clover Hay "Slobber" Animals, J. Kenneth Evans, A. S. Williams, D. E. Labore

Agronomy Notes

For years, farmers have noticed the slobbering of animals after feeding second-cutting red clover hay. Severity of this effect, however, has varied from year to year. Questions asked many times are what causes the slobbering and what can be done about it? To get the answers available, let's go back about 37 years into something which appears to be totally unrelated to slobbering and follow research which has been done on a fungus, which causes a disease of red clover.

Mammalian Distribution Within Biotic Communities Of Northeastern Jewell County, Kansas, Kenneth W. Andersen, Eugene D. Fleharty

Fort Hays Studies Series

The purpose of this investigation was threefold. First, to obtain as complete a list as possible of mammals occuring in the area through collecting and observational procedures. Second, to determine their specific distribution within the study area, and third, to correlate and elucidate the relationships between their distribution and the major vegetational regions within the study area.

Distribution Of Native Mammals Among The Communities Of The Mixed Prairie, Edwin Perry Martin

Fort Hays Studies Series

From October, 1952, until August, 1958, the small mammals on a relict area near Hays, Kansas, were studied. The observations were undertaken to establish a standard to which the mammals of variously disturbed areas could be compared; also, information concerning the relations of the species of mammals to the communities of the mixed prairie was sought.

Some Effects Of Inorganic Fluoride On Plants, Animals, And Man, Delbert A. Greenwood

Faculty Honor Lectures

~~~ in the compounds of fluorine may be traced to one or more of the following factors: ( 1) the consumption of a drinking water containing one part per million of fluorine as a soluble flouride during the period of calcification and eruption of the teeth causes a reduction in the incidence of tooth decay; however, an intake of drinking water containing more than two parts per million of fluorine causes dental fluorosis of varying degrees in man and certain animals; (2) a continuous intake of excessive amounts of fluorine as mineral supplement, in contaminated forage, or the grazing of …

Javma37-43 Anthrax In Swine, L. Van Es

University of Nebraska-Lincoln Extension: Historical Materials

Anthrax is not commonly considered so important a menace to swine as it is to other forms of live stock, in which the disease is apt to declare itself with terrifying severity. In comparison with the marked mortality frequently observed in cattle, the tangible losses caused by anthrax in swine seem negligible. As recent as 25 years ago, there still were observers who sincerely doubted the occurrence of the disease in hogs and this opinion found some support in the many reported failures to induce the infection in that animal species by artificial methods.

A Study Of Intersexuality As Exhibited In Animal Forms, Ida V. Jaggard

Biology Honors Papers

This 21 page thesis discusses the entire scope of animal intersexuality with examples illustrating certain types of intersexuality. Much of the thesis is based on the works of F. A. E. Crew and Alexander Lipschutz.

Rb28-229 Fattening Steers Of Various Ages, H.J. Gramlich

University of Nebraska-Lincoln Extension: Historical Materials

During recent years the beef industry has undergone vast changes. These have been made necessary in part by economic conditions and in part by changes in the demands of the American people. The tendency has been toward earlier marketing of steers, so that instead of going to the block as mature individuals at from 3 to 5 years of age, they are now reaching the market at a much younger age. In consuming centers where only heavy carcasses of beef were demanded formerly there is a call today for carcasses of the yearling and long yearling class.

The experiments reported …

The Vegetarian And Our Fellow Creatures April 1901, The Vegetarian Magazine

1890-1909

Periodical discussing the vegetarian lifestyle and recipes. Includes the column "The Dining Room." Includes recipes for several soups such as milk, cream of celery, cream of asparagus, cream of corn, cauliflower, and tomato. Other recipes include breakfast cake, orange fritters, mushroom patties, and knodeln. Also includes articles against animal cruelty.