Advances in Optical and Electron Microscopy, Vol. 6

1978 ◽  
Vol 97 (2) ◽  
pp. 269
Author(s):  
Oscar W. Richards ◽  
R. Barer ◽  
V. E. Cosslett
Keyword(s):  
Electron Microscopy ◽  
Optical And Electron Microscopy

The Cuticle of Cysticerci of Taenia Saginata, T. Hydatigena, and T. Pisiformis

1963 ◽  
Vol s3-104 (65) ◽  
pp. 141-144
Author(s):  
E. H. SIDDIQUI
Keyword(s):  
Electron Microscopy ◽  
Outer Layer ◽  
Middle Layer ◽  
Taenia Saginata ◽  
Optical And Electron Microscopy

The structure of the cuticle of the cysticerci of 3 species of Taenia was studied by means of optical and electron microscopy. In all 3 species the cuticle is composed of 3 layers and covered with hair-like processes. The middle layer, which comprises the bulk of the cuticle, varies in thickness from head to bladder, but there are no differences in thickness between the species studied. The hairs are composed of a core representing an extension of the middle layer and are covered by a continuation of the outer layer. The arrangement of these hairs varies in the species studied.

Role of Bi and Ca Additions in Controlling the Microstructure of Sr-Modified 319 Alloys

2006 ◽  
Vol 519-521 ◽  
pp. 1257-1264 ◽  
Author(s):  
S. El Hadad ◽  
A.M. Samuel ◽  
F.H. Samuel ◽  
H.W. Doty ◽  
S. Valtierra
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Image Analysis ◽  
Mg Alloys ◽  
Microstructural Characteristics ◽  
Optical And Electron Microscopy ◽  
Modification Effect ◽  
Eutectic Si ◽  
Mg Addition

The role of bismuth (50 to 9000 ppm) and calcium (50 to 200 ppm) additions on the microstructural characteristics in Sr-modified 319 alloys (with/without 0.4 wt% Mg addition) were investigated using optical and electron microscopy, and image analysis. It was found that the modification effect of Sr continuously diminished with Bi addition up to ~3000 ppm Bi; further Bi addition led to the modification of the Si particles due to the presence of Bi. In the Ca-containing alloys, a coarse eutectic Si structure resulted with Ca additions of 50 ppm, due to the formation of Alx(Ca,Sr)Siy compounds. Increased Ca additions (up to 200 ppm) did not alter the Si particle size. The Alx(Ca,Sr)Siy phase particles appeared in rod-like form in the Sr-modified alloys and in plate-like form in the 319+0.4 wt% Mg alloys. MgO, Al2O3, and AlP particles appear to act as nucleants for the precipitation of the plate-like Alx(Ca,Sr)Siy phase.

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