Xem 1-20 trên 38 kết quả The microscopic study
  • Microscopy is a servant of all the sciences, and the microscopic examination of minerals is an important technique which should be mastered by all students of geology early in their careers. Advanced modern textbooks on both optics and mineralogy are available, and our intention is not that this new textbook should replace these but that it should serve as an introductory text or a first stepping-stone to the study of optical mineralogy.

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  • No one would have believed in the last years of the nineteenth century that this world was being watched keenly and closely by intelligences greater than man’s and yet as mortal as his own; that as men busied themselves about their various concerns they were scrutinised and studied, perhaps almost as narrowly as a man with a microscope might scrutinise the transient creatures that swarm and multiply in a drop of water. With infinite complacency men went to and fro over this globe about their little affairs, serene in their assurance of their empire over matter.

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  • Tools shape how we think; when the only tool you have is an axe, everything resembles a tree or a log. The rapid advances in instrumentation in the last decade, which allow us to measure and manipulate individual molecules and structures on the nanoscale, have caused a paradigm shift in the way we view molecular behavior and surfaces. The microscopic details underlying interfacial phenomena have customarily been inferred from in situ measurements of macroscopic quantities. Now we can see and “finger” physical and chemical processes at interfaces.

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  • With the advent of the atomic force microscope (AFM) came an extremely valuable analytical resource and technique, useful for the qualitative and quantitative surface analysis with sub-nanometer resolution. In addition, samples studied with an AFM do not require any special pretreatments that may alter or damage the sample, and permit a three dimensional investigation of the surface.

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  • The traditional classification of acute leukemia used criteria proposed by the French– American–British Cooperative Group (FAB) , using the 30% bone marrow blast cell cutoff (Bennett et al, 1985). This classification system originally distinguished different leukemia types by morphologic features and cytochemical studies, particularly myeloperoxidase (or Sudan black B) and non-specific esterase staining. It was revised to include leukemia types that could only be accurately identified with the addition of immunophenotyping or electron microscopic studies (Bennett et al., 1991)....

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  • I examined the structure of the cryofractured book lung of Phidippus audax with a scanning electron microscope. Each book lung is essentially a stack of flattened air-sacs, or lamellae, which project anteriorly into the lateral hemolymph space of the anterior opisthosoma. Each lamella is roughly triangular in shape. Hemolymph flows across each lamella from the medial to the lateral side (Fig. 1). Air enters the lamellae from the third, posterior side, after passing through a network of irregular cuticular struts (air filter) which lines the atrium of the book lung.

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  • The uptake of five fluorescein labeled cell-penetrating peptides (Tat, Tat2, mutated-Tat, peptide vascular endothelial-cadherin and transportan) was studied in wheat immature embryos. Interestingly, permeabilization treat-ment of the embryos with toluene⁄ethanol (1 : 20, v⁄v with permeabiliza-tion buffer) resulted in a remarkably higher uptake of cell-penetrating peptides, whereas nonpermeabilized embryos failed to show significant cell-penetrating peptide uptake, as observed under fluorescence microscope and by fluorimetric analysis....

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  • Simulation of the diffusion mechanism via microscopic bubbles in amorphous materials is carried out using the statistical relaxation models $Co_{81.5}B_{18.5}$ containing $2\times 10^5$ atoms. The present work is focused on the role of these bubbles for self-diffusion in amorphous solids. It was found that the numbers of the vacancy bubbles in amorphous $Co_{81.5}B_{18.5}$ vary from $1.4\times 10^{-3}$ to $4\times 10^{-3}$ per atom depending on the relaxation degree. The simulation shows the collective character of the atomic movement upon diffusion atoms moving.

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  • High-resolution X-ray diffraction structures of integral membrane proteins have revealed various binding modes of lipids, but current spectroscopic studies still use uniform macroscopic binding constants to describe lipid binding. The Adair approach employing microscopic lipid-binding con-stants has previously been taken to explain the enhancement of agonist binding to the nicotinic acetylcholine receptor by general anaesthetics in terms of the competitive displacement of essential lipid activator molecules [Walcher S, Altschuh J & Sandermann H (2001) J. Biol. Chem. 276, 42191–42195]....

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  • S100A1 is a typical representative of a group of EF-hand calcium-binding proteins known as the S100 family. The protein is composed of twoasub-units, each containing two calcium-binding loops (N and C). At physiologi-cal pH (7.2) and NaCl concentration (100 mm), we determined the microscopic binding constants of calcium to S100A1 by analysing the Ca 2+ -titration curves of Trp90 fluorescence for both the native protein and its Glu32fiGln mutant with an inactive N-loop.

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  • The key component of osteocyte’s mechanosensing apparatus is the pericellular matrix. limited electron microscope studies reveal that this fluffy “jungle” consists of nanoscale fibrous structures, (about 100nm thick), filling the tiny gap between the cell membrane and the bone matrix. Mechanically, it controls the hydraulic permeability of the bone tissue, determining how easy fluid flows around the cells under external loading.

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  • (BQ) Part 1 book "The cutaneous lymphoid proliferations - A comprehensive textbook of lymphocytic infiltrates of the skin" presents the following contents: Cutaneous mantle cell lymphoma, mycosis fungoides and sézary syndrome, subcutaneous panniculitis like t cell lymphoma, nasal and related extranodal natural killer cell T cell lymphomas and blastic plasmacytoid dendritic cell neoplasm,...

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  • (BQ) Part 2 book "Mosby's manual of diagnostic and laboratory tests" presents the following contents: Electrodiagnostic tests, endoscopic studies, fluid analysis studies, manometric studies, microscopic studies and associated testing, nuclear scanning, stool tests, ultrasound studies, urine studies,...

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  • Cell biology studies the structural and physiological properties of cells, including their behaviors, interactions, and environment. This is done on both the microscopic and molecular levels, for single-celled organisms such as bacteria as well as the specialized cells in multicellular organisms such as humans. Understanding the structure and function of cells is fundamental to all of the biological sciences. The similarities and differences between cell types are particularly relevant to molecular biology....

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  • The conservation of artefacts and buildings has a long history, but the positive emergence of conservation as a profession can be said to date from the foundation of the International Institute for the Conservation of Museum Objects (IIC) in 1950 (the last two words of the title being later changed to Historic and Artistic Works) and the appearance soon after in 1952 of its journal Studies in Conservation.

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  • Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials. It uses methods of analytical solid mechanics to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material's resistance to fracture.In modern materials science, fracture mechanics is an important tool in improving the mechanical performance of materials and components.

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  • In fact, biomedical image or globalization. Thus, a strange author, who went astray stir in the direction can be published more appropriate. And really, there are few fall into that category. However, the majority of submissions have a broad linkages biomass, but not of its remote sensor. The wide range of topics, all related to biomass, prompted us to reconsider if the scope originally envisioned perhaps understood by biologists and food scientists other than by engineers? is simple act of checking biomass through a microscope is a form of remote sensing?...

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  • The effect of lignin, which is an important additive for the negative electrode in lead±acid batteries, is studied on lead electrodes in sulfuric acid by means of potentiostatic transient measurements and in situ electrochemical atomic force microscope (EC-AFM) observations. During oxidation of the electrodes, it is con®rmed that the current transition in electrolyte with 20 ppm lignin gives a broad, hill-like curve, while that in electrolyte without lignin is a sharp peak.

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  • The air pollution accumulating in the interior of automobiles consists almost exclusively of gaso- line and diesel exhaust. This toxic soup of gases, aerosols, and microscopic particles includes ben- zene (a known carcinogen), carbon monoxide (which interferes with the blood’s ability to trans- port oxygen), particulate matter (which studies have associated with increased death rates), and a host of other hazardous chemicals.

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học 'Respiratory Research cung cấp cho các bạn kiến thức về ngành y đề tài: " Alterations of alveolar type II cells and intraalveolar surfactant after bronchoalveolar lavage and perfluorocarbon ventilation. An electron microscopical and stereological study in the rat lung...

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