Microscopic methods

Xem 1-20 trên 21 kết quả Microscopic methods
  • The importance of particle characterization in both the research and development, and the manufacture and quality control of materials and products that we use in our everyday lives is, in some sense, invisible to those of us not directly involved with these activities. Few of us know how particle size, shape, or surface characteristics can influence, for example, the efficacy of a painreliever, or the efficiency of a catalytic converter, or the resolution of a printer.

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  • An overview of PTB’s activities in the field of dimensional nanometrology using scanning probe microscopes (SPMs) is presented. The chapter is divided into two parts: the development of (1) high-resolution probing systems and (2) complete SPM metrology systems. The subject of SPM-probing system design comprises, among other things, the concept of the “sensor objective” to combine conventional microscopy with scanning probe techniques.

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  • Is a branch of polymer science dealing with analysis and characterisation of polymers. üThe complication of macromolecular chains, the dispersion in molecular weight, tacticity, crystallinity, orientation, composition of polymers etc. and complex morphological systems ⇒ analysis of polymer ≠ the small organic materials ⇒ Focus on viscoelastic properties, dynamic mechanical testing.

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  • This is the first book to cover the history, structure, and application of atomic force microscopy in cell biology. Presented in the clear, well-illustrated style of the Methods in Cell Biology series, it introduces the atomic force microscope (AFM) to its readers and enables them to tap the power and scope of this technology to further their own research. A practical laboratory guide for use of the atomic force and photonic force microscopes, it provides updated technology and methods in force spectroscopy.

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  • Tiêu chuẩn Việt Nam.TCVN 6686-1:2000,Milk - Enumeration of somatic cells part 1: Microscopic method. Sữa. Định lượng tế bào xôma. Phần 1: Phương pháp dùng kính hiển vi

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  • Today, an individual would be hard-pressed to find any science field that does not employ methods and instruments based on the use of fine focused electron and ion beams. Well instrumented and supplemented with advanced methods and techniques, SEMs provide possibilities not only of surface imaging but quantitative measurement of object topologies, local electrophysical characteristics of semiconductor structures and performing elemental analysis.

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  • Prostate cancer is the most common male cancer diagnosed in Western populations. Autopsy studies have shown that with increasing age, the majority of men will develop microscopic foci of cancer (often termed “latent” prostate cancer) and that this is true in populations that are at both high and low risk for the invasive form of the disease (1). However, only a small percentage of men will develop invasive prostate cancer. The prevalence of prostate cancer is, thus, very common; but to most men, prostate cancer will be only incidental to their health and death....

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  • In this project, you draw an unusual microscopic animal commonly referred to as a water flea. As with many advanced projects, both verbal instructions and visual steps may seem complex, as it is assumed that you already have strong drawing skills. However, you may be able to successfully complete this project with only basic skills if you have completed most of the lessons in the beginner sections. This project consists of the following three sections:

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  • In 1665, a book was published that inaugurated the use of the microscope to investigate the natural world. The author was Robert Hooke, a talented artist, architect, and amateur scientist. Hooke wrote Micrographia: Or Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses with Observations and Inquiries Thereupon, at the behest of the newly chartered Royal Society in London, for whom he was working as curator of scientific experiments. In Micrographia, he presented the first detailed observations of everyday objects made with his self-constructed light microscope....

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  • he Group A β-hemolytic streptococcus (Streptococcus pyogenes, or GAS) is a form of β-hemolytic Streptococcus bacteria. It is a gram positive bacteriaum responsible for a wide range of both invasive and non-invasive infections.[1] The name derives from the greek word 'streptos,' meaning 'twisted chain,' due to the fact that the bacteria resembles a string of small pearls when viewed under the microscope

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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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  • Microscopic and imaging techniques: – Optical microscopy – Confocal microscopy – Electron microscopy (SEM and TEM, related methods) – Scanning probe microscopy (STM and AFM, related methods) Surface spectrometric techniques: – X-ray fluorescence (from electron microscopy) – Auger electron spectrometry – X-ray photoelectron spectrometry (XPS/UPS/ESCA)

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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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  • Israelachvil, J. N. et al.“Surface Forces and Microrheology of ...” Handbook of Micro/Nanotribology. Ed. Bharat Bhushan Boca Raton: CRC Press LLC, 1999 © 1999 by CRC Press LLC Surface Forces and Microrheology of Molecularly Thin Liquid Films Jacob N. Israelachvili and Alan D. Berman 9.1 9.2 Introduction Methods for Measuring Static and Dynamic Surface Forces Adhesion Forces • Force Laws • The Surface Force Apparatus and the Atomic Force Microscope 9 9.3 9.

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  • Lan and Sheng Nanoscale Research Letters 2011, 6:251 http://www.nanoscalereslett.com/content/6/1/251 NANO EXPRESS Open Access Electron cotunneling through doubly occupied quantum dots: effect of spin configuration Jian Lan, Weidong Sheng* Abstract A microscopic theory is presented for electron cotunneling through doubly occupied quantum dots in the Coulomb blockade regime.

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  • This paper will show the results of the first experiments to get nano-clay clay composite materials based on modified polystyrene resin by melt - mix method. The intercalated nanocomposite structures are characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM) techniques. Polystyrene nano-composites with 2% nanoclay by weight exhibit an increases about 10% in impact resistance and they also lower the water absortion (nearly 60% compared with polystyrene resin) without any significant loss of tensile strength, flexural strength and flexural modulus.

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  • It is no surprise to see the micro-Raman Group at Lille come forth with this timely publication to document the present state of Raman microscopy. A quarter century has passed since the early attempts at Raman microsampling when the field began to merge with, and complement, other microprobe techniques. In the late 1960s to the early '70s, it was mainly the electron beam methods that opened up the microscopic domain to instrumental analysis, aside from classical light microscopy.

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  • Nanotips have been in increasing demand over the last two decades, owing to their crucial role in the main nanotechnology instruments, like scanning probe microscopes and scanning electron and transmission microscopes. Well-defined ultrasharp tips have also attracted a growing interest in molecular electronics, as they are needed for fabrication and characterization of molecular structures. In this chapter we present several methods that have been explored so far for fabricating such ultrasharp tips, with an emphasis on the most recent technique.

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  • A comparative study of HIV associated pulmonary tuberculosis (HIV-PTB) was carried out in Chest Clinics situated in Benin and Irrua environs of Edo State, Nigeria, using microscopical and serological methods. In Irrua environs, HIV-PTB coinfection is higher in females (12.5%) than in males (9.2%) but not statistically significant (P 0.05). In Benin, HIV-PTB is also higher in females (11.3%) than in males (7.2%) but not statistically significant (P 0.05). In Benin, PTB is statistically high among 0.05)....

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  • If the items are whole parts then it is relatively simple for an expert to identify the specimen: usually a natural history museum, botanic garden or university would be most appropriate. Identification may involve simple morphological studies or microscopic examination. Once a specimen has been processed to any degree, identification becomes more difficult. If ingredients have been highly processed and mixed with other ingredients, only sophisticated forensic techniques can hope to provide a definitive answer that will be acceptable in court.

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