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Atlas of Esophageal Disease and Intervention - - Bog - Springer-Verlag New York Inc. - Plusbog.dk

Synthesis of Heterocyclic Compounds - A. L. Mndzhoian - Bog - Springer-Verlag New York Inc. - Plusbog.dk

Synthesis of Heterocyclic Compounds - A. L. Mndzhoian - Bog - Springer-Verlag New York Inc. - Plusbog.dk

The chemistry of heterocyclic compounds now forms one of the most extensive and important branches of organic chemistry. The rapid expansion of investigation in this field is due largely to the ever increasing practical importance of heterocyclic com­ pounds. The present stage in the development of organic chemistry and closely allied branches of biology is characterized by extensive investigation of physiologically active substances encountered in the plant and animal world and playing important parts in the life processes of micro- and macro-organisms. This extensive inves­ tigation of alkaloids, vitamins, hormones, antibiotics and their synthetic substitutes, and also of substances that control the bio­ chemical processes of the nervous system, has acted as a powerful stimulus to the further development of the chemistry of hetero­ cyclic compounds. Moreover, there are many well known applications of heterocyclic compounds in the manufacture of dyes, synthetic resins, synthetic rubbers, and other important materials. In response to growing demands, several monographs and treatises on the chemistry of heterocyclic compounds have appeared in recent years, the most comprehensive of these being the series "Heterocyclic Compounds," edited by R. C. Elderfield, which is already appearing in Russian translation. On the other hand, the lack of a practical guide to the laboratory preparation of hetero­ cyclic compounds is being felt more and more.

DKK 663.00
1

Scanning Electron Microscopy and X-Ray Microanalysis - Dale Newbury - Bog - Springer-Verlag New York Inc. - Plusbog.dk

Scanning Electron Microscopy and X-Ray Microanalysis - Dale Newbury - Bog - Springer-Verlag New York Inc. - Plusbog.dk

This thoroughly revised and updated Fourth Edition of a time-honored text provides the reader with a comprehensive introduction to the field of scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS) for elemental microanalysis, electron backscatter diffraction analysis (EBSD) for micro-crystallography and focused ion beams. Students and academic researchers will find the text to be an authoritative and scholarly resource, while SEM operators and a diversity of practitioners — engineers, technicians, physical and biological scientists, clinicians, and technical managers — will find that every chapter has been overhauled to meet the more practical needs of the technologist and working professional. In a break with the past, this Fourth Edition de-emphasizes the design and physical operating basis of the instrumentation, including the electron sources, lenses, detectors, etc. In the modern SEM, many of the low level instrument parameters are now controlled and optimized by the microscope’s software, and user access is restricted. Although the software control system provides efficient and reproducible microscopy and microanalysis, the user must understand the parameter space wherein choices are made to achieve effective and meaningful microscopy, microanalysis, and micro-crystallography. Therefore, special emphasis is placed on beam energy, beam current, electron detector characteristics and controls, and ancillary techniques such as energy dispersive x-ray spectrometry (EDS) and electron backscatter diffraction (EBSD). With 13 years between the publication of the third and fourth editions, new coverage reflects the many improvements in the instrument and analysis techniques. The SEM has evolved into a powerful and versatile characterization platform in which morphology, elemental composition, and crystal structure can be evaluated simultaneously. Extension of the SEM into a "dual beam" platform incorporating both electron and ion columns allows precision modification of the specimen by focused ion beam milling. New coverage in the Fourth Edition includes the increasing use of field emission guns and SEM instruments with high resolution capabilities, variable pressure SEM operation, theory, and measurement of x-rays with high throughput silicon drift detector (SDD-EDS) x-ray spectrometers. In addition to powerful vendor- supplied software to support data collection and processing, the microscopist can access advanced capabilities available in free, open source software platforms, including the National Institutes of Health (NIH) ImageJ-Fiji for image processing and the National Institute of Standards and Technology (NIST) DTSA II for quantitative EDS x-ray microanalysis and spectral simulation, both of which are extensively used in this work. However, the user has a responsibility to bring intellect, curiosity, and a proper skepticism to information on a computer screen and to the entire measurement process. This book helps you to achieve this goal. - Realigns the text with the needs of a diverse audience from researchers and graduate students to SEM operators and technical managers - Emphasizes practical, hands-on operation of the microscope, particularly user selection of the critical operating parameters to achieve meaningful results - Provides step-by-step overviews of SEM, EDS, and EBSD and checklists of critical issues for SEM imaging, EDS x-ray microanalysis, and EBSD crystallographic measurements - Makes extensive use of open source software: NIH ImageJ-FIJI for image processing and NIST DTSA II for quantitative EDS x-ray microanalysis and EDS spectral simulation. - Includes case studies to illustrate practical problem solving - Covers Helium ion scanning microscopy - Organized into relatively self-contained modules – no need to "read it all" to understand a topic

DKK 858.00
1

Food Allergens - Marija Gavrovic Jankulovic - Bog - Springer-Verlag New York Inc. - Plusbog.dk

Food Allergens - Marija Gavrovic Jankulovic - Bog - Springer-Verlag New York Inc. - Plusbog.dk

A food allergen has the ability to first elicit an IgE response, and then, on subsequent exposures, a clinical response to the same or similar protein. How harmless food protein becomes recognized by the mucosal immune system as an allergen remains an open question and more data are needed to explain how regulatory mechanisms of the mucosal immune system fail and result in allergic sensitization to dietary antigens. Some biochemical characteristics associated with food allergens, such as the presence of multiple, linear IgE-binding epitopes and the resistance of the protein to digestion and processing, seem to predominate among food allergens. Digestion susceptibility of food allergens that sensitize via the gastrointestinal tract and stability to food processing conditions are inherently related to protein structural features. Thereby, physiological changes in the digestion process, pathological conditions affecting digestion, as well as procedures and food processing conditions that affect protein structure may all have a profound effect on the sensitizing potential and allergenicity of food proteins. In addition, signals coming from the diet and micro biome can modulate regulatory mechanisms of the mucosal immune system and influence mucosal immunity and intestinal barrier function. The detection of allergenic ingredients in food products has received increased attention from the food industry and legislative and regulatory agencies over recent years. This has resulted in the improvement of applied safety measures that provide protection for food-allergic consumers and development of sensitive and highly specific analytical methods of food allergens detection. Food allergy is an important and common health issue and therefore there is a need to characterize the sensitizing potential of newly introduced proteins in genetically engineered foods. A combination of in vitro and in silico methods provide information that contributes to safety assessment. Suitable in vivo models may provide a more holistic assessment of allergenic potential of novel food proteins.

DKK 780.00
1