Results 251 to 260 of about 795,490 (279)

Drug Stability in Biological Specimens

2020
Drug stability is an important consideration that is sometimes overlooked. However, changes in drug concentration can occur after specimen collection, during storage, shipping, transport, and evidence handling. Although environmental conditions, such as temperature and exposure to light, can play an important role, drug stability is analyte dependent ...
Barry S. Levine, Daniel S. Isenschmid, Michael L. Smith   +2 more
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ELECTRON MICROSCOPY OF FROZEN, HYDRATED BIOLOGICAL SPECIMENS

Annual Review of Biophysics and Biophysical Chemistry, 1986
BIOLOGICAL APPLICATIONS 246 Two-Dimensional Periodic Arrays of Membrane Proteins 247 Thin Crystals of Proteins, Nucleic Acids, and Protein-Nucleic Acid Complexes 247 Viruses 251 Filamentous Proteins 252 CONCLUSION ...
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Microholography applied to biological specimens

SPIE Proceedings, 1990
The problem of getting holograms of microscopic structures is considered, so as to apply the three-dimensional properties of holograms to biological specimens. Some optical holographic techniques are studied, pointing out problems concerning vision far from the microscope axis.
Bruno Bianco, Tullio Tommasi
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Nuclear microscopy of biological specimens

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1991
Recent developments in technology have enabled the scanning proton microprobe to scan at submicron spatial resolution on a routine basis. The use of the powerful combination of techniques PIXE (proton induced X-ray emission), nuclear (or Rutherford) backscattering (RBS), and secondary electron detection operating at this resolution will open up new ...
Watt, F., Grime, G. W., Brook, A. J., Gadd, G. M., Perry, C. C., Pearce, R. B., Turnau, K., Watkinson, S. C.   +7 more
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High resolution scanning microscopy of biological specimens

Philosophical Transactions of the Royal Society of London. B, Biological Sciences, 1970
A scanning microscope is described which is capable of a point resolution of 0.5 nm. We have demonstrated that it can produce the same kinds of micrographs as a conventional microscope. However, by using several detectors to produce signals corresponding to different groups of transmitted electrons we are able to produce an image contrast ...
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ELECTRON TOMOGRAPHY OF BIOLOGICAL SPECIMENS

1997
This chapter addresses the issue of three-dimensional reconstruction of biological macromolecules from electron microscopy images. First, the electron microscope device, the micrographs as specimen projections and the projection collection geometry are discussed.
Marabini Roberto, San Martin M. Carmen, Carazo Jose M.   +2 more
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O2 Imaging in Biological Specimens

2012
This chapter describes the fundamentals of an O2 imaging technique based on the quenched-phosphorescence detection of Pt-porphyrin probes. The wide-field, confocal and multi-photon microscopy and methodological aspects of quenched phosphorescence icO2 imaging techniques, theoretical and practical considerations, are briefly described and critically ...
Andreas Fercher, Alexander V. Zhdanov, Dmitri B. Papkovsky   +2 more
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Prognostic biological features in neck dissection specimens

European Archives of Oto-Rhino-Laryngology, 2012
The superior prognostic value offered by routine histopathological staging of neck dissections, as compared to clinical staging using palpation and modern imaging techniques, is well established in the literature concerning the management of squamous cell carcinoma of the head and neck.
Woolgar, J.A., Triantafyllou, A., Lewis Jr., J.S., Hunt, J., Williams, M.D., Takes, R.P., Thompson, L.D., Slootweg, P.J., Devaney, K.O., Ferlito, A.   +9 more
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Colorimetry of Shiny Biological Specimens

The Canadian Entomologist, 1956
Professor John Stanley of McGill University recently asked the National Research Council for assistance in specifying the colors of flour beetles (Tribolium). These insem are small (3 or 4 mm. long), rounded, dark, and shiny, and therefore present a somewhat unusual colorimetric problem.
W. E. K. Middleton, G. W. Wyszecki
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X-Ray Micro-radiography of Biological Specimens

Nature, 1951
A HGHLY loaded micro-focus X-ray tube1,2 was used for taking X-ray photographs of microscopic specimens. Engstrom and others3–5 have established a strong case for this kind of micro-radiography and have obtained remarkable photographs of microscopic sections in a wave-length range of 5–10 A. using a special tube with a focus of moderate size.
W, EHRENBERG, W E, SPEAR
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