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Full-Text Articles in Life Sciences
Non-Equilibrium Surface Diffusion Measurements In Systems With Interactions, M. C. Tringides, K. R. Roos, A. Jesina, J. Haas, P. Levenberg
Non-Equilibrium Surface Diffusion Measurements In Systems With Interactions, M. C. Tringides, K. R. Roos, A. Jesina, J. Haas, P. Levenberg
Scanning Microscopy
Diffusion in surface overlayers with adsorbate-adsorbate interactions is described in terms of coverage-dependent diffusion coefficients. The measured phenomenological Arrhenius parameters (activation energy and prefactor) depend on the initial configuration of the system. Since different experimental methods probe the system in different states, the measured diffusion coefficients depend on the method used. Experimental results demonstrating this dependence are presented for O/W(110) -p(2x1) + p(2x2) and Ag/Si(111) -√3 x √3 R30°. They were measured during the evolution of the system to attain a new equilibrium state of different symmetry. In addition, simulations on lattice gas models with interactions, modeling …
Growth Of Yba2cu3o7-Δ Thin-Films–Nucleation, Heteroepitaxy And Interfaces, M. Grant Norton, C. Barry Carter
Growth Of Yba2cu3o7-Δ Thin-Films–Nucleation, Heteroepitaxy And Interfaces, M. Grant Norton, C. Barry Carter
Scanning Microscopy
A major research effort in high-temperature oxide superconductors is the growth of high-quality thin-films. The physical properties of polycrystalline thin-films are controlled by their microstructure which is influenced by the early stages of film growth and the establishment of epitaxy. In this article, the nucleation and heteroepitactic growth of YBa2Cu3O7-δ thin-films is reviewed. Many of the examples illustrating film growth will be taken from studies using transmission electron microscopy. The importance of the substrate surface in controlling film growth will be discussed, in particular the growth of YBa2Cu3O7-δ films on …
Responses Of Astrocytes In Culture After Low Dose Laser Irradiation, David T. Yew, D. R. Zheng, C. Au, W. W. Y. Li
Responses Of Astrocytes In Culture After Low Dose Laser Irradiation, David T. Yew, D. R. Zheng, C. Au, W. W. Y. Li
Scanning Microscopy
The effect of Helium-Neon low dose laser on astrocytes was investigated in cultures of isolated astrocytes from albino neonatal rats. The laser appeared to inhibit the growth of astrocytes as exemplified by the smaller sizes of the cells and the decreased leucine uptake in each cell after treatment. Temporary decrease in the number of mitoses was also observed, but this trend was reversed soon after. Electron microscopic studies revealed an increase in buddings from cell bodies and processes (branches) after irradiation.
The Study Of Biominerals By High Resolution Transmission Electron Microscopy, Stephen Mann
The Study Of Biominerals By High Resolution Transmission Electron Microscopy, Stephen Mann
Scanning Electron Microscopy
This paper presents an overview of the study of the ultrastructure of biogenic inorganic solids (biominerals) using high resolution transmission electron microscopy (HRTEM). A range of biominerals have been studied including iron oxides, calcium phosphates, calcium carbonates and silica. The studies have revealed information concerning the structural complexity of these materials and have identified crystallographic order and disorder at the nanometre level. In addition, the results have aided the elucidation of the mechanisms of nucleation and growth of biogenic minerals.
Ultrastructural Studies On The Cultivation Processes And Growth And Development Of The Cultivated Mushroom Agaricus Bisporus, D. A. Wood, G. D. Craig, P. T. Atkey, R. J. Newsam, K. Gull
Ultrastructural Studies On The Cultivation Processes And Growth And Development Of The Cultivated Mushroom Agaricus Bisporus, D. A. Wood, G. D. Craig, P. T. Atkey, R. J. Newsam, K. Gull
Food Structure
Scanning electron microscopy (SEM) , transmission electron microscopy and light microscopy have been used to study various processes in the cultivation of the edible mushroom Agaricus bisporus . Mushrooms are cultured on composted wheat straw. The microbial degradation processes during composting have been visualised by TEM and SEM and correlated with microbiological studies . Various modes of attack by the microorganisms on the plant cell walls can be seen. Most rapid degradation occurred on the cuticle and phloem and spread to other cell types. Microbial attack was found to be nonuniform between tissue types and individual cells. The mycelium of …
Some Factors Influencing Ante-Mortem Changes In Muscle: A Brief Review, S. C. Seideman, S. H. Cohen, J. V. Schollmeyer
Some Factors Influencing Ante-Mortem Changes In Muscle: A Brief Review, S. C. Seideman, S. H. Cohen, J. V. Schollmeyer
Food Structure
Ante-mortem changes to muscle microstructure are influenced in many ways. During pre-natal cell differentiation and growth , myoblasts develop and mature into cells with quite different characteristics. Incorporated into the genome of these cells is the ability to synthesize a wide variety of filaments which occupy specific niches within each myofibril. During post-natal development , depending upon the particular precursor cell lines, different fiber types are produced. These are especially important in contributing to the ultimate palatability of meat. In this paper several factors which influence ante-mortem changes to muscle microstructure are discussed. While some of these are better understood …
An Analysis Of Microstructural Factors Which Influence The Use Of Muscle As A Food, R. G. Cassens, C. E. Carpenter, T. J. Eddinger
An Analysis Of Microstructural Factors Which Influence The Use Of Muscle As A Food, R. G. Cassens, C. E. Carpenter, T. J. Eddinger
Food Structure
Study of structure of muscle provides information on the location and arrangement of various components and the changes which may be inflicted upon them. The structura l features of muscle have been descr ibed in detail down to the molecular level, but rega rding its use as a food, special interest centers on the connective tissue component and on myofibri llar proteins . Muscle comprises about 1/3 of the live weight of the a ni mal and is not static , but rather is subject to major changes in properties associated with growth, repair and se nescence. It is apparent …