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Author: U. Lüttge
Publisher: Springer Science & Business Media
ISBN: 3642874967
Category : Science
Languages : en
Pages : 245
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Book Description
In biological literature, several definitions of quantitative autoradio graphy are given. The term is defined as either the determination and com parison of the density of silver grains above various structures or under varying conditions, or the determination of absolute quantities of radio activity. In both these cases, photometric measurement serves for more rapid and more exact evaluation of grain densities than would be possible by visual counting of the grains. The equipment generally used for the photometric measurement of silver grains consists of a microscope, a photocell, an electronic amplifier system and a display unit. Grains can be made accessible to photometric evaluation by various kinds of microscopic illumination: 1. Substage bright-field illumination. 2. Substage dark-field illumination. 3. Incident dark-field illumination. 4. Vertical bright-field illumination. With all these types of illumination, the relationship between the luminous flux I absorbed by the film, scattered into the objective and reflected or diffracted, and the flux 10 which is not affected by the film is used as a measure of grain density. Since these are differential measurements, the light beam I transmitted by the film is in itself a measure of grain density if the luminous flux 10 incident on the grains is kept constant. This approach has been used in a large number of measuring setups.
Author: U. Lüttge
Publisher: Springer Science & Business Media
ISBN: 3642874967
Category : Science
Languages : en
Pages : 245
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Book Description
In biological literature, several definitions of quantitative autoradio graphy are given. The term is defined as either the determination and com parison of the density of silver grains above various structures or under varying conditions, or the determination of absolute quantities of radio activity. In both these cases, photometric measurement serves for more rapid and more exact evaluation of grain densities than would be possible by visual counting of the grains. The equipment generally used for the photometric measurement of silver grains consists of a microscope, a photocell, an electronic amplifier system and a display unit. Grains can be made accessible to photometric evaluation by various kinds of microscopic illumination: 1. Substage bright-field illumination. 2. Substage dark-field illumination. 3. Incident dark-field illumination. 4. Vertical bright-field illumination. With all these types of illumination, the relationship between the luminous flux I absorbed by the film, scattered into the objective and reflected or diffracted, and the flux 10 which is not affected by the film is used as a measure of grain density. Since these are differential measurements, the light beam I transmitted by the film is in itself a measure of grain density if the luminous flux 10 incident on the grains is kept constant. This approach has been used in a large number of measuring setups.
Author: U. Zimmermann
Publisher: Springer Science & Business Media
ISBN: 3642659861
Category : Science
Languages : en
Pages : 475
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Book Description
In February, 1974, an 'International Workshop on Membrane Transport in Plants' was held at the Nuclear Research Centre, JLiI ich, West Germany. More than two hundred and fifty people, from fourteen countries, took part in this highly successful meeting. A somewhat similar meeting took place in Liverpool, England, two years ago and it became clear there that progress in the field of membrane transport in plants was now so marked that a second, and wider, meeting in Germany was more than fully justified. The members of our pro gramme committee (U. Zimmermann, Chairman, JLilich (FRG); J. Dainty,
Author: William V. Dashek
Publisher: Springer Science & Business Media
ISBN: 1592592325
Category : Science
Languages : en
Pages : 297
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Book Description
Hands-on experimentalists describe the cutting-edge microscopical methods needed for the effective study of plant cell biology today. These powerful techniques, all described in great detail to ensure successful experimental results, range from light microscope cytochemistry, autoradiography, and immunocytochemistry, to recent developments in fluorescence, confocal, and dark-field microscopies. Important advances in both conventional and scanning electron microscopies are also fully developed, together with such state-of-the-art ancillary techniques as high-resolution autoradiography, immunoelectron microscopy, X-ray microanalysis, and electron systems imaging. Easy-to-use and up-to-date, Methods in Plant Electron Microscopy and Cytochemistry offers today's plant scientists a first class collection of readily reproducible light and electron microscopical methods that will prove the new standard for all working in the field.
Author: C.R. Stocking
Publisher: Springer Science & Business Media
ISBN: 3642664172
Category : Science
Languages : en
Pages : 534
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Book Description
The problems associated with the movement of water and solutes throughout the plant body have intrigued students of plants since Malpighi's conclusions in 1675 and 1679 that nutrient sap flows upward and downward in stems through vessels in both wood and bark. Steven Hale's ingenious experiments on the movement of water in plants in 1726 and Hartig's observations of sieve-tube exudation in the mid-19th century set the stage for continued intensive studies on long-range transport in plants. In spite of this interest for more than 200 years in the movement of solutes and water in plants, it has only been within the last 20 to 30 years that extensive research effort has been directed toward a critical evaluation of the interactions among the various cellular organelles. The important roles played by the exchange of metabolites in the control and regulation of cellular processes is now widely recognized, but in most instances poorly understood.
Author: Richard T. Giberson
Publisher: Springer Science & Business Media
ISBN: 1592591280
Category : Science
Languages : en
Pages : 223
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Book Description
Richard Giberson and Richard Demaree, Jr, have collected a wide range of time-saving microwave techniques for processing biological samples for evaluation by many different microscopic methods. Described in step-by-step detail by hands-on researchers, these readily reproducible protocols include both optimized classic methods and such state-of-the art techniques as in vivo labeling, formalin fixation of fresh tissue, vacuum processing, and processing for scanning electron microscopy. Each stand-alone microwave method has been handcrafted by a researcher who regularly uses it to ensure processing success and the brightest quality result.
Author: United States. Environmental Protection Agency. Library Systems Branch
Publisher:
ISBN:
Category : Environmental protection
Languages : en
Pages : 702
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Book Description
Author: Indra Vasil
Publisher: Elsevier
ISBN: 0323142192
Category : Science
Languages : en
Pages : 860
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Book Description
Laboratory Procedures and Their Applications
Author: J. Barrow
Publisher: Springer Science & Business Media
ISBN: 9401118809
Category : Science
Languages : en
Pages : 787
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Book Description
Plant Nutrition - From Genetic Engineering to Field Practice, the 12th International Colloquium on Plant Nutrition, is the latest in a series which began in 1954. Early meetings were mainly concerned with the practical problems of soil fertility, with soil assessment, fertilizer requirements and methods of analysis. As the colloquia have progressed, the emphasis has slowly changed. The practical problems are still important, but there is increasing emphasis on plant physiology, plant biochemistry, membrane biochemistry, and even on the chemistry of genes which control the proteins which transfer nutrient ions to the inside of cells. The meetings therefore provide a valuable opportunity for each half of the science of plant nutrition to interact with, and learn from the other half. This volume begins with five papers which review current knowledge in important fields: the rhizosphere, molecular biology, electron microscopy, location and function of elements in vivo, and modelling nutrient responses in the field. These themes are continued in groups of shorter papers which follow. In addition, there are sections on nutrient dynamics and partitioning, diagnostic techniques, plant survival strategies, mycorrhizas, and on nutrients such as P, N, S, K, Ca, Mg, and micronutrients. A large section is devoted specifically to boron - reflecting the considerable current interest in this element. In total there are 177 refereed papers providing both a broad overview and a detailed picture of the latest developments in pure and applied plant nutrition.
Author: M.A. (Eric) Hayat
Publisher: Elsevier
ISBN: 0323147291
Category : Science
Languages : en
Pages : 522
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Book Description
Fixation for Electron Microscopy presents how to better understand the effects of fixatives on the molecular structure of the cell. This book attempts to consider each aspect of fixation, including chemical interactions between fixatives and individual cellular substances. The chemistry of fixative interactions that are discussed in the book is based primarily on the reactions of a fixative with isolated proteins, lipids, nucleic acids, and carbohydrates. The book shows that the correct interpretation of information retrieved from electron micrographs depends on the knowledge of the basic principles underlying the fixation procedure. Also, the book presents the fixation of both eukaryotic and prokaryotic specimens. The special fixation conditions for plant specimens are discussed in detail and have been allotted a whole chapter. Also emphasized in this book is the connection between morphology and biochemical aspects of preparatory treatments and the chemical basis of the formation of artifacts. This topic is useful in understanding the modifications of cell structures introduced during their processing. A guide for recognizing and minimizing major artifacts and fixation faults that are usually encountered is also presented in the book. This valuable resource will prove useful to both students and professionals in the field of biology and clinical medicine. Specimen preservation researchers can also benefit from this book.
Author: Library of Congress. Copyright Office
Publisher: Copyright Office, Library of Congress
ISBN:
Category : Copyright
Languages : en
Pages : 1760
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Book Description
