Catalog
Number

     Description

Price

40750
 

40750C

"Holey" Film - Correction of astigmatism in the electron microscope can best be done using a planar specimen such as a "holey" film which is carbon coated to give good contrast for easy observation of the Fresnel fringes around the edge of the hole. A range of hole sizes is provided. From these select the optimum size round hole for your magnification requirements. When you achieve symmetry of the Fresnel fringes, astigmatism has been eliminated. The carbon coated "holey" formvar film is mounted on a 200 mesh, 3.0 mm diameter, copper athene-type grid.
Note!! This perforated film is typically not used as a substrate. For a perforated film that is used as a substrate please see our Lacy Film.

$16.95 ea
 

$109.95/ pk of 25

40750-300

Holey Film on 300 mesh copper grid. Pkg of 25.

$109.95 pkg

40750M2

"Holey Film" on 200 mesh molybdenum grids.
     Package of 15

$289.95/pkg of 15

40750M3

"Holey Film" on 300 mesh molybdenum grids.
     Package of 15.

$289.95/pkg of 15

12030

Calibrating Carbon - Where surface roughness studies are necessary, these spherical particles, lying in the range of 100-500 nm, are invaluable. Shadows of these particles accurately calibrate every area being examined. Also, the shadows may be used to calculate elevations and depressions. Complete instructions for use included.

$7.75

40800

Catalase Crystals - Crystals of bovine liver catalase are recommended as an internal standard of length in the electron microscope. Absolute sizes in the magnification range of 10,000 X to 150,000 X may be determined with an accuracy of +/- 2.5% and relative sizes with an accuracy of +/- 1.5%. Based on experimental data, the principal catalase lattice spacing is 172 +/- 4 Angstroms. Lattice lines separated by half this distance are used in actual size determinations. Crystals are suspended in antibacterial solution. Sealed in 10 ml glass vial.

$62.95

40770

Nickel Screen Specimen - A 1500 mesh, 0.00015" thick nickel screen is precisely mounted within a 3.0 mm copper athene-type, double grid. The double grid is firmly secured to provide a sturdy specimen to last indefinitely. The very accurate spacings may be used to check magnification. The fine wire projections aid in the measurement of field distortions. One bar and one space measures 16.94 µm.

$31.95

40805

Ferritin - If your instrument can resolve the tetrad of this protein molecule it has better than 12.5 Angstroms resolution. Supplied as a pure suspension dispersed upon a formvar substrate.

$34.95

40795

Carbon Test Specimen - A high resolution test specimen consisting of a graphitized ISAF carbon black dispersed on "lacey" carbon film supported by a 200 mesh grid. The carbon black chains bridge openings in the film so there is no substrate to interfere with resolution tests. Imaging of the 3.4 Angstrom lattice spacing of the carbon, along with the curved regions and dislocations, permit magnification calibration and check the performance of high resolution electron microscopes.

$43.95

40810

Gold Shadowed Latex - Prepared by a dispersing a polystyrene latex suspension on a formvar substrate and shadowing with evaporated gold. Measure the finest migrated gold particles in the shadow to determine the resolution of your instrument. Latex spheres are 0.234 µm in diameter.

$24.95