Life Sciences Commons^™

Ec88-116 Universal Soil Loss Equation: A Handbook For Nebraska Producers, A. J. Jones, D. Walters, W. G. Hance, Elbert C. Dickey, J.R. Culver

Historical Materials from University of Nebraska-Lincoln Extension

Tons of soil are lost from agricultural fields in Nebraska each year as a result of water erosion. The accelerated loss of topsoil reduces the availability of plant nutrients and water needed for optimum crop production. In addition, the eroded soil frequently moves into surface waters causing sediment to be deposited in streams and reservoirs and nutrients to be released into other biological systems. The purposes of this workbook are to provide an understandng of how soil erosion estimates are determined, to estimate erosion control resulting from numerous cropping systems, and to inform the producer of alternative practices which may …

Overview Of Physical Studies Of Bulk Water In Biopolymers, Wm. Negendank

Scanning Microscopy

The Symposium of which this paper is a part, "The State Of Water In The Cell", examines evidence which indicates that the bulk water of the cell has physical properties that are different from those of free water in a dilute aqueous solution. The heterogeneity of environments of water within cells makes direct application of physical studies difficult. However, the major physiologic effect of an ordered state of bulk cell water is solute exclusion, and this is also demonstrated by simple polymer solutions. Such systems have provided an opportunity to show that such water has motional correlation times within an …

Fibroblast And Epidermal Cell-Type I Collagen Interactions: Cell Culture And Human Studies, Charles J. Doillon, Frederick H. Silver, Robert M. Olson, Chandrakala Y. Kamath, Richard A. Berg

Scanning Microscopy

Fibroblast and epidermal cell-type I collagen sponge interactions were studied in cell culture as well as in humans. In cell culture, fibroblasts were observed to migrate and proliferate throughout a type I collagen sponge containing either hyaluronic acid (HA) or fibronectin (FN). Fibroblasts accumulated in the center of the pores in sponges containing HA and appeared to surround themselves with newly synthesized extracellular matrix. In sponges containing FN, fibroblasts attached to and elongated along the collagen fibers of the sponge. In the absence of FN or HA protein synthesis of fibroblasts appeared to be inhibited by the presence of the …

The Role Of Scanning Electron Microscopy In Periodontal Research, A. Carrassi, S. Abati, G. Santarelli

Scanning Microscopy

During recent years a great amount of research has led to a better understanding of the etiology, pathogenesis and pattern of progression of periodontal diseases. Scanning electron microscopy (SEM) has contributed to this improvement, mainly with respect to histology of periodontal tissues, the description of the morphology and distribution of bacteria on the exposed root surface, analysis of the host-parasite interactions on the gingival pocket wall, and morphological evaluation of root treatment. This review deals with all these topics. Unusual types of SEM research are also described and discussed. Uncommon sample preparation techniques for SEM in periodontal research are described. …

The Cell Water Problem Posed By Electron Microscopic Studies Of Ion Binding In Muscle, L. Edelmann

Scanning Microscopy

The question whether cell K⁺ is free or bound in the striated frog muscle has been investigated during the last 10 years by different cryomethods and electron microscopy. The results support the view that most of cellular ions are osmotically inactive and that therefore the observed cell water activity must be explained by a model which assumes a specific cell water structure. According to the association-induction hypothesis, cell water is influenced by macromolecules and has low solubilities for Na⁺ and other solutes which therefore are partly excluded from cellular water. Autoradiography of frozen hydrated Na⁺ loaded muscles …

Microvascular Casting Of The Lung: Vascular Lavage, Dean E. Schraufnagel, Aloisia Schmid

Scanning Microscopy

Corrosion casting is an important tool for the study of microvascular structure, but unlike tissue preparation for light and electron microscopy, few controlled studies of the methods for preparation of microvascular casts for scanning electron microscopy have been reported. Most vascular casting begins with rinsing cells from the lumen of the blood vessels, but the necessity of this has not been shown. Because of a report of successful casting without rinsing and light microscopic evidence of edema with complete rinsing prior to casting, this preparation procedure was examined. Casts of lung vasculature that were thoroughly rinsed were compared to those …

A Review Of Methodology And Quantification In Dental Microwear Analysis, K. D. Gordon

Scanning Microscopy

Dental microwear analysis is a method of inferring oral events (primarily food processing and aspects of masticatory biomechanics) from microscopic abrasion patterns retained on the enamel surfaces of teeth. Although some qualitative pattern differences may be easily distinguishable, most of the significant results produced thus far have derived from quantified studies of SEM images of occlusal enamel. It often goes unnoticed by readers of microwear reports who are not themselves specialists that microwear analysis is essentially a statistical method, not a visual one. In this review of current techniques and methods, several problems in current approaches are detailed. It is …

Industrial Applications Of Auger Surface Analysis, R. E. Chase, G. S. Cole

Scanning Microscopy

Scanning Auger microscopy is distinguished by its unique combination of surface selectivity, high spatial resolution, ease of identifying elements and quantifying composition, and ability to distinguish between chemical states. This paper describes several applications of scanning Auger microscopy, emphasizing the range of industrial research activities:

1. Electronic Materials. Contamination in an integrated circuit processing facility was identified and procedures for its removal determined. Causes for the delamination of printed circuit board foils were identified. Superlattice films were characterized and the deposition process evaluated.

2. Tribology. Analysis of surfaces in lubricated sliding contact revealed the effects of con tact kinematics and …

A Review Of Dental Microwear And Diet In Modern Mammals, Mark F. Teaford

Scanning Microscopy

Recent work has shown that microscopic wear patterns on teeth may yield insights into variations in diet and tooth use in modern and prehistoric mammals. This paper presents a review of dental microwear and diet in modern mammals, plus a discussion of topics for further research. To date, incisor and molar microwear have been examined, although there are far fewer studies of the former. Facilitated by the use of high-resolution casts and scanning electron microscopy, analyses have ranged from: qualitative to quantitative, low magnification to high magnification, and experimental studies to comparative studies of museum collections. Results are encouraging and …

Northeast Research Station Watertown, South Dakota Annual Progress Report, 1987, Agricultural Experiment Station, Plant Science Department

Agricultural Experiment Station and Research Farm Annual Reports

This is the 1987 annual progress report for the Northeast Research Station in Watertown, South Dakota. This report is issued by the South Dakota Agricultural Experiment Station and the South Dakota State University Plant Science Department. This report includes information on the 1987 crop season, including precipitation data, grain and wheat research and disease control, corn breeding, sunflower breeding, insect control, alfalfa test, oats research, and information on the economics of alternative farming.

Oyster Spatfall In Virginia Rivers: 1987 Annual Summary, James Whitcomb

Reports

The Virginia Institute of Marine Science (VIMS) conducts weekly surveys from June through early October to obtain oyster spatfall information. Spat counts are made on oyster shells strung on wire and suspended from stakes on public and private beds. The number of spat on shells is counted each week of the spawning season to determine the potential of a particular area for receiving a strike and to predict the most likely period the strikes will occur.

Microanalytical And Micromorphological Investigations Of High Temperature Materials With And Without Protective Coatings, Volker Thien, W. Voss

Scanning Microscopy

The phenomenon "High Temperature Corrosion" (HTC) is described; three different types (pure oxidation, high temperature hot corrosion, low temperature hot corrosion) are defined. HTC is demonstrated taking gas turbine blades as an example. The results of laboratory HTC tests under defined conditions were compared with those of long time engine experience; the agreement is very satisfactory.

Metallurgical investigations with scanning electron microscopy and EDX-/WDX-analytical techniques gave explanations for the behaviour of protective coatings . The corrosion mechanism of a NiCrAlY-plasma spray coating is explained as consequence of Cr- and Al-oxidation. A special analytical technique - the "integral layer profile analysis" …

Aspects Of Bald Eagle Winter Behavior In Rush Valley Utah: A Telemetry Study, Neil B. Sabine

Theses and Dissertations

The diurnal behavior and nocturnal roosting patterns of 28 bald eagles outfitted with tail-mounted radios were investigated in Rush Valley, Utah between January and March 1982-1984. Casting analysis and feeding observations indicated the principal food source was jackrabbit carrion. Jackrabbit availability declined from 1982 to 1984 and eagles responded by; 1) roosting closer to feeding sites, 2) shifting from canyon to valley roosts, 3) arriving later at and departing earlier from roosts, 4) decreasing diurnal activity, and 5) decreasing residence time. Foraging efficiency appeared to be maximized by experienced eagles using familiar feeding areas and by naive birds monitoring their …

Preparation Of Biological Samples For Transmission X-Ray Microanalysis: A Review Of Alternative Procedures To The Use Of Sectioned Material, D. C. Sigee

Scanning Microscopy

Although transmission X-ray microanalysis of biological material has traditionally been carried out mainly on sectioned preparations, a number of alternative procedures exist. These are considered under three major headings - whole cell preparations, analysis of cell homogenates and biological fluids, and applications of the technique to microsamples of purified biochemicals. These three aspects provide a continuous range of investigative level - from the cellular to the molecular.

The use of X-ray microanalysis with whole cell preparations is considered in reference to eukaryote (animal) cells and prokaryotes - where it has particular potential in environmental studies on bacteria. In the case …

Influence Of Phosphorus And Sulphur Segregation On Stress Relief Cracking, H. Horn, T. Pintat, V. Schlett, H. Weiss

Scanning Microscopy

Three commercial weldable fine grained structural steels and four experimental melts with lowered contents of trace elements were subjected to a welding simulation treatment followed by stress relaxation (SR) tests. After testing times of up to 8 hours the samples were removed from the testing rig, broken in the fracture stage of an Auger instrument, and the fracture surface was examined in situ for segregation of elements. SEM investigations of the fracture surfaces and light microscope served to characterize fracture mode and microstructure.

The microfractural appearance of the grain boundaries exposed by the impact loading in the Auger instrument and …

Processing Of Scanning Electron Microscope Images On Basis Of Fast Fourier-Transformation, A. Yu. Sasov, A. A. Shanyavsky

Scanning Microscopy

The solar cell as a combined substrate and detector was used for automated SEM-image analysis. It was noted that an image processing system was created and its operational features are shown in some typical applications. The step size of the fatigue striations was found. The obtained value of the step corresponds to the formula with an accuracy of about 1 per cent. Quantum-mechanical constant of material fracture for aluminum alloys was found to be 𝛥 = 0.22. Two-dimensional periodic analysis was applied to fracture surfaces and a microchannel plate. The integral characteristics of microstructure was determined quantitatively.

Research Report No. 17, Stand Structure And Yield Of Slash Pine Plantations In East Texas, Update: 1987, J. David Lenhart

Informal Project Reports

An updated diameter distribution yield prediction system is Presented for slash pine ( Pinus elliottii Engelm. ) plantations on non-old-fields in East Texas. The new revised system was developed using data from initial measurement ( 1982- 84) and first remeasurement ( 1985-87) of the East Texas Pine Plan tat ion Research Project permanent Plots.

Diet-Selection Ecology Of Tropically And Temperately Adapted Honey Bees, Robert G. Danka, Richard L. Hellmich, Thomas E. Rinderer, Anita M. Collins

Richard L Hellmich

Colonies of tropically adapted (Africanized) honey bees had greater numbers and higher percentages of pollen foragers than did temperately adapted (European) honey bees. European colonies had greater overall foraging activity. The number of pollen gatherers in Africanized nests was greater throughout the daily foraging cycle, and was especially high early in the morning when pollen was most abundant. Africanized colonies fielded more pollen collectors even when levels of stimuli which are known to regulate pollen foraging were altered experimentally. Collectively, the foraging patterns resulted in larger stores of pollen in Africanized honey bee nests, while European bee nests typically had …

Number 17 (December 1987), Southern Fishes Council

Southeastern Fishes Council Proceedings

(December 1987) - Morphometric and Meristic Characteristics of a Peripheral Population of Enneacanthus. By M.S. Peterson and S.T. Ross, 4 pp.

Ecology of the Muscadine Darter, Percina sp. of. P. macrocephala, in the Tallapoosa River, Alabama, with Comments on Related Species. By W. Wieland and J.S. Ramsey, 7 pp. plus News Notes.

Morphometric And Meristic Characteristics Of A Peripheral Population Of Enneacanthus, Mark S. Peterson, Stephen T. Ross

Southeastern Fishes Council Proceedings

No abstract provided.

Ecology Of The Muscadine Darter, Percina Sp. Cf. P. Macrocephala, In The Tallapoosa River, Alabama, With Comments On Related Species, Werner Wieland, John S. Ramsey

Southeastern Fishes Council Proceedings

No abstract provided.

Business Meeting Minutes, Southeastern Fishes Council

Southeastern Fishes Council Proceedings

No abstract provided.

Regional Sfc Reports, Southeastern Fishes Council

Southeastern Fishes Council Proceedings

No abstract provided.

News Notes, Southeastern Fishes Council

Southeastern Fishes Council Proceedings

No abstract provided.

Research Project No. 15, Predicting Individual Tree Height Of Planted Loblolly And Slash Pines In East Texas, Update: 1987, Cheryl R. Dixon

Informal Project Reports

Updated equations to estimate individual total tree height of loblolly pine ( Pinus taeda L. ) and slash pine ( Pinus elliottii Engelm. ) trees planted on non-old-fields in East Texas are presented. The new revised equations were developed using data from initial measurement and first remeasurement of the East Texas Pine Plantation Research Project Permanent plots ( 1982-1987).

Research Report No. 16, Stand Structure And Yield Of Loblolly Pine Plantations In East Texas, Update: 1987, J. David Lenhart

Informal Project Reports

An updated diameter distribution yield prediction system is presented for loblolly pine ( Pinus taeda L. ) plantations on non- old-fields in East Texas. The new revised system was developed using data from initial measurement ( 1982-84) and f irst remeasurement ( 1985-87) of the East Texas Pine Plan tat ion Research Project permanent plots.

“The Poor People Had Suddenly Become Rich” A Boom In Maine Wheat, 1793-1815, Jamie H. Eves

Maine History

The article discusses the important role played in the surreptitious trade in wheat to the British Empire during the Napoleonic Wars. Its European supplies choked off by tariffs and embargoes, Britain turned to Ireland and to the United States for grain.

West River Agricultural Research And Extension Center Progress Report, 1987, Agricultural Experiment Station

Agricultural Experiment Station and Research Farm Annual Reports

This is the 1987 annual progress report of the West River Crops Soils Research and Extension Center, South Dakota Agricultural Experiment Station. This report includes: a weather summary for all west river counties involved in research, small grain variety trials, information on oilseed crops, feed grain crops, forage crops, management, tillage and cultural practices, and numerous weed control research projects.

Southeast South Dakota Experiment Farm Annual Progress Report, 1987, Agricultural Experiment Station

Agricultural Experiment Station and Research Farm Annual Reports

This twenty-seventh annual report of the research program at the Southeast South Dakota Experiment Farm has special significance for those engaged in agriculture and the agriculturally related businesses in the nine county area of southeast South Dakota. Reports in this document include information on: temperatures and precipitation data, corn production and performance, soybean research and planting, soil testing, fertilizer testing, herbicide research, crop rotation, sorghum, small grains, livestock research, and pest and weed control.

[Review Of] The Body In Time, Robert A. Aken

Library Faculty and Staff Publications

No abstract provided.