Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Animal Sciences (329)
- Agriculture (301)
- Biology (301)
- Plant Sciences (233)
- Physical Sciences and Mathematics (225)
-
- Education (159)
- Marine Biology (112)
- Social and Behavioral Sciences (106)
- Other Animal Sciences (99)
- Curriculum and Instruction (98)
- Ecology and Evolutionary Biology (98)
- Environmental Sciences (88)
- Biochemistry, Biophysics, and Structural Biology (82)
- Medicine and Health Sciences (81)
- Aquaculture and Fisheries (75)
- Botany (75)
- Agricultural Economics (72)
- Forest Sciences (72)
- Entomology (63)
- Zoology (52)
- Agronomy and Crop Sciences (50)
- Science and Mathematics Education (50)
- Biochemistry (49)
- Microbiology (45)
- Anthropology (44)
- Food Science (39)
- Oceanography and Atmospheric Sciences and Meteorology (39)
- Law (38)
- Genetics and Genomics (37)
- Institution
-
- University of Nebraska - Lincoln (339)
- Utah State University (212)
- Kansas State University Libraries (137)
- William & Mary (107)
- Department of Primary Industries and Regional Development, Western Australia (84)
-
- University of Texas Rio Grande Valley (63)
- Eastern Illinois University (51)
- South Dakota State University (40)
- University of Northern Iowa (40)
- Loyola University Chicago (30)
- Old Dominion University (29)
- University of Kentucky (28)
- Selected Works (27)
- University of Arkansas, Fayetteville (27)
- University of New Hampshire (25)
- California Polytechnic State University, San Luis Obispo (23)
- University of Tennessee, Knoxville (23)
- Loma Linda University (21)
- Portland State University (14)
- Stephen F. Austin State University (14)
- Western Kentucky University (14)
- Western Michigan University (14)
- Nova Southeastern University (13)
- Iowa State University (12)
- SelectedWorks (12)
- University of Colorado Law School (12)
- University of Montana (12)
- University of South Florida (12)
- Dartmouth College (11)
- The University of Maine (10)
- Keyword
-
- Publications (61)
- Cattlemen's Day (50)
- Western Australia (50)
- University of Nebraska (48)
- Cooperative Extension (46)
-
- Nebraska Cooperative Extension (46)
- Swine day (45)
- Research and Technical Reports (36)
- Management (32)
- Wetlands (25)
- Vegetation (22)
- Scanning electron microscopy (19)
- Fauna (18)
- Fisheries (18)
- Soils (18)
- Acidity (17)
- Dairy Day (17)
- Disease (17)
- Geology (17)
- Land Degradation (17)
- Soil Compaction (17)
- Topography (17)
- Water Erosion (17)
- Wildflowers (17)
- Wind Erosion (17)
- Bacteria (16)
- Extension publications (16)
- Contaminated (14)
- X-ray microanalysis (14)
- Virginia (13)
- Publication
-
- Scanning Microscopy (125)
- Kansas Agricultural Experiment Station Research Reports (115)
- University of Nebraska-Lincoln Extension: Historical Materials (98)
- Kika de la Garza Congressional Papers - Agriculture Committee News Releases (60)
- Reports (44)
-
- Journal of the Iowa Academy of Science: JIAS (35)
- Dissertations, Theses, and Masters Projects (34)
- Nebraska Bird Review (33)
- Specimens by Name (33)
- Journal of the Department of Agriculture, Western Australia, Series 4 (30)
- All Graduate Theses and Dissertations, Spring 1920 to Summer 2023 (28)
- Journal of the Arkansas Academy of Science (26)
- Crop Watch (25)
- VIMS Articles (24)
- Master's Theses (23)
- Masters Theses (23)
- Conference on Applied Statistics in Agriculture (22)
- Herbarium Publications (22)
- South Dakota Beef Report, 1994 (22)
- Insecta Mundi (21)
- Loma Linda University Electronic Theses, Dissertations & Projects (21)
- RISK: Health, Safety & Environment (1990-2002) (21)
- Faculty Publications (17)
- Harold W. Manter Laboratory of Parasitology: Faculty and Staff Publications (17)
- Native vegetation handbook series (17)
- Biological Sciences Faculty Publications (15)
- Department of Animal Science: Faculty Publications (14)
- Transactions of the Nebraska Academy of Sciences and Affiliated Societies (14)
- Biology Faculty Publications (13)
- Dissertations and Theses (13)
- Publication Type
- File Type
Articles 1 - 30 of 1703
Full-Text Articles in Life Sciences
Effects Of 17Β-Estradiol On Distribution Of Pituitary Isoforms Of Luteinizing Hormone And Follicle-Stimulating Hormone During The Follicular Phase Of The Bovine Estrous Cycle, F. N. Kojima, Andrea S. Cupp, T. T. Stumpf, D. D. Zalesky, M. S. Roberson, L. A. Werth, M. W. Wolfe, Roger J. Kittok, H. E. Grotjan, J. E. Kinder
Effects Of 17Β-Estradiol On Distribution Of Pituitary Isoforms Of Luteinizing Hormone And Follicle-Stimulating Hormone During The Follicular Phase Of The Bovine Estrous Cycle, F. N. Kojima, Andrea S. Cupp, T. T. Stumpf, D. D. Zalesky, M. S. Roberson, L. A. Werth, M. W. Wolfe, Roger J. Kittok, H. E. Grotjan, J. E. Kinder
Department of Animal Science: Faculty Publications
The objective of this study was to examine the influence of 17β-estradiol (E2) on distribution of LH and FSH isoforms during the follicular phase of the bovine estrous cycle prior to the preovulatory surges of LH and FSH. On Day 16 of the estrous cycle (Day 0 = estrus), intact controls (CONT; n = 4) were treated with prostaglandin F2α (PGF2α) to induce luteal regression and initiation of the follicular phase. Other cows were also treated with PGF2α and either ovariectomized (OVX; n = 5) or ovariectomized and given E2 implants (OVXE; n …
Strain Relaxation In Compositionally Graded Ingaas/Gaas Heterostructures, Karen L. Kavanagh, Rachel S. Goldman, Jessica C. P. Chang
Strain Relaxation In Compositionally Graded Ingaas/Gaas Heterostructures, Karen L. Kavanagh, Rachel S. Goldman, Jessica C. P. Chang
Scanning Microscopy
Epilayer strain relaxation in the InGaAs/GaAs system occurs via two mechanisms, plastic deformation and/or surface roughening. Under conditions of two-dimensional growth, we find that compositionally graded InGaAs/GaAs (001) multi-layer buffer structures will plastically deform with < 110 > misfit dislocations approaching 100% strain relaxation. At higher growth temperatures, large-amplitude roughening is observed preferentially along the [110] direction, and the strain relaxation becomes asymmetric in the < 110 > directions. In single epilayers, the symmetry of the strain relaxation is dependent on the magnitude of the substrate offcut angle. In all cases, the epilayers develop a tilt about an in-plane axis in proportion to and opposite in …
Reconstructions Of C60 On The Ag(111)1x1 Surface, X. -D. Wang, S. Yamazaki, J. -L. Li, T. Hashizume, H. Shinohara, T. Sakurai
Reconstructions Of C60 On The Ag(111)1x1 Surface, X. -D. Wang, S. Yamazaki, J. -L. Li, T. Hashizume, H. Shinohara, T. Sakurai
Scanning Microscopy
We report the scanning tunneling microscope (STM) study of the C60 adsorption on the Ag(111)1x1 surface. The well-ordered C60 monolayer with good quality was obtained by briefly annealing the multilayer C60 at approximately 300°C. It is concluded that the (2√3)x(2√3)R30° reconstruction is energetically the most stable phase, while two other phases, "hex-a" and "hex-b" phases, are also observed, rotated by approximately 12.5 ± 1.5° and 47.5 ± 1.5° with respect to the stable (2√3)x(2√3)R30° phase. It is suggested that some specific stable adsorption sites are responsible for the pinning …
Atomic Step Organization In Homoepitaxial Growth On Gaas(111)B Substrates, Leo J. Schowalter, Kai Yang, Thomas Thundat
Atomic Step Organization In Homoepitaxial Growth On Gaas(111)B Substrates, Leo J. Schowalter, Kai Yang, Thomas Thundat
Scanning Microscopy
When homoepitaxial growth is performed on exactly oriented (singular) (111) GaAs substrates, while maintaining the √19 x √19 surface reconstruction, the originally flat surface spontaneously evolves vicinal (111) facets that are tilted approximately 2.5° toward the < 211 > azimuthal directions. These facets form pyramid-like structures where the distance between adjacent peaks can be varied from as little as 1 μm to tens of μm. When these surfaces are observed with atomic force microscopy (AFM), we find that they are extremely smooth with the observed tilt resulting from atomic steps which are spaced at approximately 7.5 nm. We have also studied growth on …
Strain Relaxation In Graded Ingaas And Inp Buffer Layers On Gaas (001), K. Eberl, K. Häusler, T. Shitara, Y. Kershaw, W. Sigle
Strain Relaxation In Graded Ingaas And Inp Buffer Layers On Gaas (001), K. Eberl, K. Häusler, T. Shitara, Y. Kershaw, W. Sigle
Scanning Microscopy
We investigate compositionally graded Inxo≤x≤0.5Ga1-xAs and InP buffer layers which are prepared by molecular beam epitaxy on (001) GaAs substrate. The initial In content xo is equal to 0, 0.12, 0.18, 0.24, and 0.5 for the different samples. The In composition of the graded buffer increases linearly between xo and 0.5 with a fixed slope of 50% In-content per μm. The idea was to combine the advantage of surface flatness in homogeneous buffer layers and the reduced density of threading dislocations on the surface for graded buffer layers. The best compromise in terms of …
Transmission Electron Microscopy, High Resolution X-Ray Diffraction And Rutherford Backscattering Study Of Strain Release In Ingaas/Gaas Buffer Layers, G. Salviati, L. Lazzarini, C. Ferrari, P. Franzosi, S. Milita, F. Romanato, M. Berti, M. Mazzer, A. V. Drigo, M. R. Bruni, M. G. Simeone, N. Gambacorti
Transmission Electron Microscopy, High Resolution X-Ray Diffraction And Rutherford Backscattering Study Of Strain Release In Ingaas/Gaas Buffer Layers, G. Salviati, L. Lazzarini, C. Ferrari, P. Franzosi, S. Milita, F. Romanato, M. Berti, M. Mazzer, A. V. Drigo, M. R. Bruni, M. G. Simeone, N. Gambacorti
Scanning Microscopy
Strain release and dislocation distribution in InGaAs/GaAs double heterostructures, step-graded and linear-graded buffer layers have been studied. A higher misfit dislocation density at the inner interface between the InGaAs layer and the substrate was found in all the samples. This corresponded to a strain release of the inner ternary layers much larger than predicted by equilibrium theories. The residual parallel strain of the external layers as a function of their thickness was found to follow a curve approximately of slope -0.5, in agreement with previous investigations on single InGaAs layers. This result has been interpreted as evidence that the elastic …
Bias Dependence Of The Depletion Layer Width In Semi-Insulating Gaas By Charge Collection Scanning Microscopy, A. Castaldini, A. Cavallini, C. Del Papa, M. Alietti, C. Canali, F. Nava, C. Lanzieri
Bias Dependence Of The Depletion Layer Width In Semi-Insulating Gaas By Charge Collection Scanning Microscopy, A. Castaldini, A. Cavallini, C. Del Papa, M. Alietti, C. Canali, F. Nava, C. Lanzieri
Scanning Microscopy
A procedure for the evaluation of the depletion region width of a Schottky barrier diode made on semi-insulating materials has been assessed and applied to gallium arsenide nuclear detectors. This procedure, which makes use of the optical beam induced current method of charge collection scanning microscopy, allows the direct measurement of the depletion layer width. By taking into account the high resistivity of the material under examination and measuring the diode reverse current, it is possible to evaluate the actual voltage applied at the depletion layer boundaries. It was found that, at low actual bias values, the voltage dependence of …
Principles Of Semiconductor Surface Reconstruction, C. B. Duke
Principles Of Semiconductor Surface Reconstruction, C. B. Duke
Scanning Microscopy
Semiconductor surfaces are known to reconstruct, i.e., their surface atomic geometries differ from those of the corresponding surface planes in the bulk material. For clean tetrahedrally coordinated semiconductors, these reconstructed geometries are shown to be predicted by five simple principles. These principles are illustrated by the specific examples of Si(100)-(2x1), Si(111)-(2x1), GaAs(100)-c(2x8), GaAs(111)-(2x2), and relaxed zincblende (110) surfaces. The concept of universal (i.e., material independent) semiconductor surface structures is introduced and shown to be characteristic of the cleavage surfaces of tetrahedrally coordinated compound semiconductors. The role of scanning tunneling microscopy in identifying and validating these principles is highlighted.
Mapping Metal Distributions In Thin Cryosections Without Scanning Transmission Electron Microscope With The Philips Electron Beam And Image Deflection (Ebid) Unit, A. J. Morgan, J. M. Brock, C. Winters, G. H. J. Lewis
Mapping Metal Distributions In Thin Cryosections Without Scanning Transmission Electron Microscope With The Philips Electron Beam And Image Deflection (Ebid) Unit, A. J. Morgan, J. M. Brock, C. Winters, G. H. J. Lewis
Scanning Microscopy
The purpose of the present paper was to describe the use of a commercially-available, and relatively inexpensive, beam and image deflection unit that can facilitate digital X-ray (element) mapping in a standard transmission electron microscope not furnished with a STEM attachment. The test specimen was a thin freeze-dried section of the metal-sequestering chloragogenous tissue from the earthworm, Lumbricus rubellus, inhabiting a soil naturally contaminated with Pb, Zn and Cd. Qualitative maps obtained from this material confirmed the efficacy of the deflection unit, and revealed the presence of three compositionally distinct metal-accumulating compartments within the chloragocytes: (i) ovoid, electron-dense, phosphate-bearing and …
Role Of Surface Interactions In Determining Surface Structure And State Formation In Iii-V Semiconductors, H. E. Ruda, G. P. Jiang
Role Of Surface Interactions In Determining Surface Structure And State Formation In Iii-V Semiconductors, H. E. Ruda, G. P. Jiang
Scanning Microscopy
GaAs(100), (110), and (111) surfaces are chosen as a vehicle to explain the plethora of surface relaxation and reconstruction phenomena seen for III-V compound semiconductors. These relaxation and reconstruction processes directly affect the formation of surface states. The occupation of these states, in turn, can have a profound influence on device performance. The purpose of this work is to attempt to provide a unified description of the phenomena responsible for surface relaxation and reconstruction on these surfaces. Our work makes use of an ab initio effective core potential scheme based on the Hartree Fock approximation. We discuss the critical steps …
Dislocation Nucleation And Propagation In Semiconductor Heterostructures, D. Cherns, S. Mylonas, C. T. Chou, J. Wu, D. E. Ashenford, B. Lunn
Dislocation Nucleation And Propagation In Semiconductor Heterostructures, D. Cherns, S. Mylonas, C. T. Chou, J. Wu, D. E. Ashenford, B. Lunn
Scanning Microscopy
This paper considers misfit dislocation nucleation and propagation in dilute magnetic semiconductor heterostructures in the CdTe-ZnTe-MnTe system. It is shown that, where the deposit is in tension, 1/2 < 110 > dislocations with inclined Burgers vectors propagate by glide along interfacial < 110 > directions and may dissociate giving intrinsic stacking faults. In cases where the deposit is in compression, 1/2 < 110 > dislocations show no evidence of dissociation and propagate by extensive cross-slip to give networks of dislocations close to interfacial < 100 > directions.
Evidence for dislocation sources in ZnTe/GaSb films is presented. ZnTe films contained stacking fault pyramids, single Frank faults and a new type of "diamond defect" …
Surface Stress, Morphological Development, And Dislocation Nucleation During Sixge1-X Epitaxy, D. E. Jesson, S. J. Pennycook, J. -M. Baribeau, D. C. Houghton
Surface Stress, Morphological Development, And Dislocation Nucleation During Sixge1-X Epitaxy, D. E. Jesson, S. J. Pennycook, J. -M. Baribeau, D. C. Houghton
Scanning Microscopy
Utilizing Ge marker layer experiments combined with atomic number contrast (Z-contrast) imaging, we have studied the evolving surface morphology of SixGe1-x alloys during growth by molecular beam epitaxy. The marker layers map out the instability transition between planar two-dimensional (2D) growth and three-dimensional (3D) growth. The transition occurs via the gradual formation of a surface ripple as anticipated from instability theory. However, these undulations rapidly develop into crack-like surface instabilities which we simulate and explain by the mechanism of stress-driven surface diffusion. Finally, we model the large stresses associated with these features within a fracture mechanics formalism. …
Light Scattering And Electron Microscopy Study Of The Surface Morphology Of Gaas Films Grown By Molecular Beam Epitaxy, M. K. Nissen, C. Lavoie, S. Eisebitt, T. Pinnington, T. Tiedje
Light Scattering And Electron Microscopy Study Of The Surface Morphology Of Gaas Films Grown By Molecular Beam Epitaxy, M. K. Nissen, C. Lavoie, S. Eisebitt, T. Pinnington, T. Tiedje
Scanning Microscopy
The surface morphology of thermally quenched GaAs films grown by molecular beam epitaxy on GaAs substrates has been studied by elastic light scattering, by scanning electron microscopy and by scanning tunneling microscopy (STM) in air. STM shows that the oxide-desorbed surface of GaAs is pitted, but smooths after deposition of a few hundred nanometers of material. Light scattering shows that, after the surface has smoothed, the power spectral density of the surface approaches a q-2 dependence on spatial frequency over the spatial frequency range 0.2 μm-1 < q < 20 μm-1 that is accessible to the light scattering measurements at 488 nm. …
The Morphology And Misfit Dislocation Formation Characteristics Of Strained Heteroepitaxial Layers: Ex Situ And In Situ Growth Studies, A. G. Cullis
Scanning Microscopy
Under certain regimes of heteroepitaxial layer growth, misfit stresses can lead to very significant distortions in interface morphology, which can influence strain relief and subsequent misfit dislocation introduction. These phenomena have been clearly demonstrated in the case of SiGe/Si heteroepitaxy and the way in which surface SiGe growth ripples are accompanied by strain waves has been established. The ripples provide partial elastic relief of the layer misfit stress in a manner which has been correlated with theoretical expectations. The local stress variations ultimately may influence the formation and disposition of misfit dislocations in the strained layer structures. The present paper …
Ionoluminescence: A New Tool For Nuclear Microprobes In Geology, C. Yang, N. P. -O. Homman, K. G. Malmqvist, L. Johansson, N. M. Halden, V. Barbin
Ionoluminescence: A New Tool For Nuclear Microprobes In Geology, C. Yang, N. P. -O. Homman, K. G. Malmqvist, L. Johansson, N. M. Halden, V. Barbin
Scanning Microscopy
When an ion beam in the energy range of a few MeV/amu impacts on a mineral, visible light can often be observed. This light, induced by energetic ions, is termed ionoluminescence (IL). The intensity and wavelength of the ionoluminescent light provide information concerning the nature of luminescence centers, such as trace substituents and structural defects, found in the mineral. This makes IL a useful complement to other methods of ion beam analysis (IBA), such as particle induced X-ray emission (PIXE) and Rutherford backscattering (RBS), in characterizing geological samples. In the present study, a proton or alpha particle beam was used …
Ultrastructure Of Dentin Matrix In Heritable Dentin Defects, J. Waltimo, H. Ranta, P. -L. Lukinmaa
Ultrastructure Of Dentin Matrix In Heritable Dentin Defects, J. Waltimo, H. Ranta, P. -L. Lukinmaa
Scanning Microscopy
Heritable dentin defects form a group of diseases which exclusively affect dentin among the various dental tissues. While one type is associated with the generalized connective tissue disorder, osteogenesis imperfecta, other types occur as single traits. The clinical manifestations of the dentin defects vary from insignificant to severe enough to cause aesthetical and functional failure of the teeth. Scanning and transmission electron microscopic studies, reviewed in this paper, have markedly clarified the ultrastructure of the aberrant dentin matrix. Both similar and different changes seem to occur in the various forms of heritable dentin defects. Abnormalities in the appearance and organization …
Observations On Interactions Between Metal Clusters And Iii-V Semiconductor Substrates, Theodore D. Lowes
Observations On Interactions Between Metal Clusters And Iii-V Semiconductor Substrates, Theodore D. Lowes
Scanning Microscopy
Interfacial reactions between deposited indium and gallium metals with GaAs(001) substrates are discussed. After Knudsen cell molecular beam epitaxy (MBE) deposition, samples were annealed in ultrahigh vacuum (UHV) and examined by ex situ electron microscopy. The resulting microstructure was compared to the microstructure of GaAs(001) substrates without metal deposition. It is shown that significant interactions occur between the deposited metal and substrate and that the final microstructure is consistent with the model for thermal decomposition of III-V compound semiconductor substrates.
Metastable Reconstructions On Si(111), Y. -N. Yang, E. D. Williams
Metastable Reconstructions On Si(111), Y. -N. Yang, E. D. Williams
Scanning Microscopy
We report unambiguous atomic scale evidence demonstrating that the atom density in the high temperature "1x1" phase of Si(111) is ~6% higher than the 7x7. Such evidence is provided by scanning tunneling microscopy (STM) observation of excess adatom density, and related island formation, on surfaces with very large terraces. The unusually large terraces were produced by heating the sample with DC current in the step-down direction at 1200°C. By trapping adatoms on the terraces through a quench, we have also created areas of metastable reconstructions, i.e., 9x9, 2x2, c2x4 and √3x√3, much larger than previously reported. For …
Boron Reconstructed Si(111) Surfaces Produced By B2o3 Decomposition, J. Nogami, S. Yoshikawa, J. C. Glueckstein, P. Pianetta
Boron Reconstructed Si(111) Surfaces Produced By B2o3 Decomposition, J. Nogami, S. Yoshikawa, J. C. Glueckstein, P. Pianetta
Scanning Microscopy
Scanning tunneling microscopy has been used to study the growth of boron on the Si(111) surface. Boron was deposited in the form of B2O3 which was decomposed by heating the substrate. With this technique, it is possible to control the B coverage, and also to produce the well known √3 x √3 reconstruction at annealing temperatures as low as 600°C. The optimal conditions for the formation of the √3 x √3 surface by B2O3 decomposition are given. In addition, the nature of the √3 x √3 surface over …
Epitaxial Growth Studies By Low Energy Electron Microscopy, E. Bauer
Epitaxial Growth Studies By Low Energy Electron Microscopy, E. Bauer
Scanning Microscopy
In spite of being a surface sensitive tool, low energy electron microscopy (LEEM) can also give information on interfaces. An example is the CoSi2/Si(111) interface. Most of the work discussed in this paper, however, makes use of the high surface sensitivity of LEEM which makes this method an ideal tool for the study of the early growth stages in epitaxy, in particular of the growth dynamics and of the influence of misfit on the growth mode. Two prototype substrates, Mo(110) and Si(111), and three representative deposit metals, Cu, Au and Co, are used to illustrate the large variety …
Reflection High Energy Electron Diffraction (Rheed) Intensity Oscillations: Growth Modes And Growth Rates: A Critique, B. A. Joyce, X. M. Zhang, J. H. Neave, P. N. Fawcett, M. R. Fahy, K. Sato, I. Kamiya
Reflection High Energy Electron Diffraction (Rheed) Intensity Oscillations: Growth Modes And Growth Rates: A Critique, B. A. Joyce, X. M. Zhang, J. H. Neave, P. N. Fawcett, M. R. Fahy, K. Sato, I. Kamiya
Scanning Microscopy
The origin of and diffraction effects associated with reflection high energy electron diffraction (RHEED) intensity oscillations which occur during layer-by-layer growth of epitaxial thin films of III-V compounds by molecular beam epitaxy (MBE) are explained. It is shown that on (001) oriented substrates the period of the oscillations is in general a direct measure of the film growth rate which corresponds to the group III element flux. There are, however, exceptions to this simple concept including growth under group III rich-conditions, vicinal plane growth and growth from pulsed beams; each is considered.
On non-(001) low index orientations, the RHEED oscillation …
Microdissection And Measurement Of Polytene Chromosomes Using The Atomic Force Microscope, Curtis Mosher, Daniel Jondle, Linda Ambrosio, James Vesenka, Eric Henderson
Microdissection And Measurement Of Polytene Chromosomes Using The Atomic Force Microscope, Curtis Mosher, Daniel Jondle, Linda Ambrosio, James Vesenka, Eric Henderson
Scanning Microscopy
A method to isolate specific regions of the Drosophila polytene chromosome using an atomic force microscope (AFM) was explored. The AFM was used for the microdissection of the locus of interest with much greater precision than standard microdissection techniques. The amplification of DNA isolated in this fashion by the polymerase chain reaction (PCR) is discussed. A study of the effect of hydration level on gross chromosome structure was carried out. It was shown that chromosome swelling is dependent upon humidity or the buffered medium. The significance of this swelling with respect to studies of chromosome structure under physiological conditions is …
The Principles Of Proton Probe Microanalysis In Biology, G. J. F. Legge, M. Cholewa
The Principles Of Proton Probe Microanalysis In Biology, G. J. F. Legge, M. Cholewa
Scanning Microscopy
The proton microprobe, more correctly described as an ion microprobe which operates at MeV energies, complements its parent instrument the electron microprobe. This paper compares the basic principles and performance of the two instruments and relates the evolution of biological analysis on such ion microprobes to that on electron microprobes, covering the development of sample handling techniques and of data handling techniques and comparing beam damage studies. The paper describes the variety of techniques available to the ion microprobe - the initial techniques of Energy Dispersive X-ray analysis, Rutherford Back Scattering and Nuclear Reaction Analysis and the rapid evolution of …
Meeting Minutes, December 20th, 1994, National Smokejumper Association Executive Committee
Meeting Minutes, December 20th, 1994, National Smokejumper Association Executive Committee
National Smokejumper Association Meeting Minutes
Agenda: Old Business; Board Walk Travel; Travel From Washington Dc To Missoula; Ronald Young National Agriculture Library; Hotel/Motel; Camping At Fairgrounds. Restrooms Open?; Day Trips; News Letter; Motels, Car Rental, Airlines, And Listing Of Day Trips; Work Study Student; Membership Rosters; Rent Vs Direct Payment; Nsa To Pay Earl; Reunion; Planning Meetings; Invite Charter;
X-Ray Absorption Studies Of Strain In Epitaxial (Si-Ge) Atomic Layer Superlattice And Alloy Films, T. Tyliszczak, A. P. Hitchcock, Z. H. Lu, J. -M. Baribeau, T. E. Jackman
X-Ray Absorption Studies Of Strain In Epitaxial (Si-Ge) Atomic Layer Superlattice And Alloy Films, T. Tyliszczak, A. P. Hitchcock, Z. H. Lu, J. -M. Baribeau, T. E. Jackman
Scanning Microscopy
The Si 1s (K-shell) X-ray absorption spectra of a series of strained SixGe100-x alloy thin films and several {(Si)m(Ge)n}p atomic layer superlattices (ALS) grown epitaxially on Si(100) and Ge(100) substrates have been investigated using plane polarized synchrotron radiation. Polarization dependent components of the signal are attributed to anisotropic states associated with strain-induced tetragonal distortions. The sense of the polarization is shown to be identical for all compositions (x = 25 to 92) of SiGe alloys grown on Si(100) substrates. The opposite polarization dependence is found to occur for all SixGe …
Interfacial Studies In Semiconductor Heterostructures By X-Ray Diffraction Techniques, J. -M. Baribeau, R. L. Headrick, P. Maigné
Interfacial Studies In Semiconductor Heterostructures By X-Ray Diffraction Techniques, J. -M. Baribeau, R. L. Headrick, P. Maigné
Scanning Microscopy
X-ray radiation is a non-destructive probe well suited to assess structural perfection of semiconductor material. Three techniques are used to study the interfacial roughness, period fluctuations and annealing-induced interdiffusion in various superlattice structures. Reflectivity of long period Si/Si1-xGex multiple quantum wells reveals an asymmetry oriented along the direction of miscut in the interface roughness with the Si1-xGex to Si interfaces being about twice as rough (0.5 versus 0.3 nm) as the Si to Si1-xGex interfaces. For Si-Si0.65Ge0.35 multiple quantum wells, diffuse scattering is minimal for a growth temperature …
Cropwatch No. 94-24-2, Dec. 16, 1994, Lisa Brown Jasa
Cropwatch No. 94-24-2, Dec. 16, 1994, Lisa Brown Jasa
Crop Watch
Inside
1994 index .......................... 164
Grants for producers .......... 166
CropWatch order form........ 167
Annual survey .................... 167
Agriculture News Release - 1994-12-15, United States. Congress. House. Committee On Agriculture, E. De La Garza
Agriculture News Release - 1994-12-15, United States. Congress. House. Committee On Agriculture, E. De La Garza
Kika de la Garza Congressional Papers - Agriculture Committee News Releases
No abstract provided.
Agricultural And Food Policy Preferences: The 1994 Perspectives Of South Dakota Agricultural Producers, Bashir Qasmi, John A. Sondey
Agricultural And Food Policy Preferences: The 1994 Perspectives Of South Dakota Agricultural Producers, Bashir Qasmi, John A. Sondey
Economics Research Reports
U.S. farm policies are reviewed, every five years concurrent with the drafting of new farm legislation. The present farm bill expires in 1995, and a new bill will be debated and enacted in 1995. Since farm and food policies have a major impact on farmers, information on their preferences with regard to these policies are invaluable to legislators as well as to different advocacy groups (working for farmers). The research was completed as a part of a 15 state study to document the agricultural and food policy preferences by agricultural producers. This report deals with the policy preferences of South …
Northeast Research Station Watertown, South Dakota Annual Progress Report, 1994, Agricultural Experiment Station, Plant Science Department
Northeast Research Station Watertown, South Dakota Annual Progress Report, 1994, Agricultural Experiment Station, Plant Science Department
Agricultural Experiment Station and Research Farm Annual Reports
This is the 1994 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 1994 crop season, including: precipitation summary, crop performance trials, oat research forage yields, soybean breeding, various fungicide testing, weed control.