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- W2088871880 abstract "A scanning transmission x-ray microscope at the National Synchrotron Light Source was used to image fresh, wet biological specimens at 32 Angstroms, with resolution better than 750 Angstroms. A gold Fresnel zone plate (outer zone width 500 Angstroms) was used to focus the undulator radiation, and the sample was scanned through the spot. Absorption data was recorded digitally as a gridded array. The major accomplishment of the experiment was the demonstration of the ability to image biological samples in their natural state with high resolution and natural elemental contrast mechanisms. This was achieved through the design of a sample holder that maintains an aqueous environment for the sample, yet is transparent to x-rays at 32 Angstroms. The specimens used were isolated zymogen granules (approximately 1 micron diameter) from the pancreatic acinar cells of rats. The absorption data were correlated to protein concentration, and estimates of the protein concentrations within the granules were obtained. The data also yields some information about the spatial organization of the protein in the granules, and our data is compared to models for the internal structure. The success of this experiment points toward future opportunities for dynamical studies on living systems. 6 refs., 28 figs., 2 tabs." @default.
- W2088871880 created "2016-06-24" @default.
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- W2088871880 date "1987-05-01" @default.
- W2088871880 modified "2023-09-23" @default.
- W2088871880 title "Scanning transmission x-ray microscopy of unaltered biological specimens" @default.
- W2088871880 doi "https://doi.org/10.2172/5674228" @default.
- W2088871880 hasPublicationYear "1987" @default.
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