Fine structure and enzyme histochemistry of developing duodenal epithelium of the chicken

1969 ◽  
Vol 129 (2) ◽  
pp. 109-127 ◽  
Author(s):  
Antti Penttil� ◽  
Johan Gripenberg
Keyword(s):  
Fine Structure ◽  
Enzyme Histochemistry ◽  
Duodenal Epithelium

Fine structure and development of schizonts, merozoites and macrogamonts of Eimeria acervulina in the goblet cells of the duodenal epithelium of experimentally infected birds

Parasitology ◽  
1975 ◽  
Vol 70 (2) ◽  
pp. 223-229 ◽  
Author(s):  
E. Michael
Keyword(s):  
Fine Structure ◽  
Epithelial Cells ◽  
Golgi Apparatus ◽  
Host Cell ◽  
Goblet Cells ◽  
Cellular Level ◽  
Site Specificity ◽  
Eimeria Acervulina ◽  
Duodenal Epithelium

The fine structure of trophozoites, schizonts, merozoites and macrogamonts of Eimeria acervulina found in goblet cells of the duodenal epithelium of chicks is described and compared with the corresponding stages formed in other epithelial cells. Complete schizogony, with the formation of mature merozoites, occurred freely in goblet cells. Developing macrogamonts (but no microgamonts) were rarely found in goblet cells. The stages observed were confined to the cytoplasm of the host cell above the Golgi apparatus and were usually seen between the mucous granules. The stages seen appeared normal, and contained similar structures to corresponding stages developing in other cells. The finding of developing stages of E. acervulina in goblet cells provides further evidence that site specificity of Eimeria at the cellular level is not as strict as previously thought.

scholarly journals CYTOCHEMISTRY AND ELECTRON MICROSCOPY

1963 ◽  
Vol 17 (1) ◽  
pp. 19-58 ◽  
Author(s):  
David D. Sabatini ◽  
Klaus Bensch ◽  
Russell J. Barrnett
Keyword(s):  
Electron Microscopy ◽  
Alkaline Phosphatase ◽  
Fine Structure ◽  
Acid Phosphatase ◽  
Adenosine Triphosphatase ◽  
Osmium Tetroxide ◽  
Enzyme Histochemistry ◽  
Succinic Dehydrogenase ◽  
Optimal Conditions ◽  
Fixation Procedure

The aldehydes introduced in this paper and the more appropriate concentrations for their general use as fixatives are: 4 to 6.5 per cent glutaraldehyde, 4 per cent glyoxal, 12.5 per cent hydroxyadipaldehyde, 10 per cent crotonaldehyde, 5 per cent pyruvic aldehyde, 10 per cent acetaldehyde, and 5 per cent methacrolein. These were prepared as cacodylate- or phosphate-buffered solutions (0.1 to 0.2 M, pH 6.5 to 7.6) that, with the exception of glutaraldehyde, contained sucrose (0.22 to 0.55 M). After fixation of from 0.5 hour to 24 hours, the blocks were stored in cold (4°C) buffer (0.1 M) plus sucrose (0.22 M). This material was used for enzyme histochemistry, for electron microscopy (both with and without a second fixation with 1 or 2 per cent osmium tetroxide) after Epon embedding, and for the combination of the two techniques. After fixation in aldehyde, membranous differentiations of the cell were not apparent and the nuclear structure differed from that commonly observed with osmium tetroxide. A postfixation in osmium tetroxide, even after long periods of storage, developed an image that—notable in the case of glutaraldehyde—was largely indistinguishable from that of tissues fixed under optimal conditions with osmium tetroxide alone. Aliesterase, acetylcholinesterase, alkaline phosphatase, acid phosphatase, 5-nucleotidase, adenosine triphosphatase, and DPNH and TPNH diaphorase activities were demonstrable histochemically after most of the fixatives. Cytochrome oxidase, succinic dehydrogenase, and glucose-6-phosphatase were retained after hydroxyaldipaldehyde and, to a lesser extent, after glyoxal fixation. The final product of the activity of several of the above-mentioned enzymes was localized in relation to the fine structure. For this purpose the double fixation procedure was used, selecting in each case the appropriate aldehyde.

Fine Structure of the Ventral Disk Apparatus and the Mechanism of Attachment in the Flagellate Giardia Muris

1973 ◽  
Vol 13 (1) ◽  
pp. 11-41 ◽  
Author(s):  
D. V. HOLBERTON
Keyword(s):  
Fine Structure ◽  
Surface Membrane ◽  
Ventral Surface ◽  
Surface Coat ◽  
Suction Force ◽  
Sinusoidal Waveform ◽  
The Face ◽  
Ventral Disk ◽  
Host Epithelium ◽  
Duodenal Epithelium

The topography of the Giardia trophozoite is dominated by the large domed sucking disk of the ventral surface. Attached to the host duodenal epithelium, the rim of this disk penetrates the enteric surface coat and interdigitates with microvilli of the epithelial cells, approaching to within 20 nm of the host surface membrane. Distortion of the host brush border within the disk suggests an applied suction force. A mechanical explanation of disk action is sought in a detailed description of the fine structure of components of the ventral surface - but is found to be untenable. The disk is supported by a platform of modified 25-nm microtubules, linked to the ventral membrane by side arms and bearing heavily cross-linked vertical dense ribbons. It is argued that such is the architecture of rigidity rather than relative movement. Around the disk a mobile cytoplasmic flange is supported by 2 lateral plates of periodic substructure. The flange has no clear mechanical role in attachment; a likely evolutionary origin from a component of the anterior axonemal axis is suggested. The cavity of the ventral disk leads posteriorly through a portal into the ventrocaudal groove: a shallow depression that houses the ventral flagella. Observation of isolated living trophozoites suggests that attachment depends on the continuing activity of the ventral flagella, which normally beat synchronously in a sinusoidal waveform. Electron micrographs confirm that this waveform is maintained in situ on the host epithelium. Of the 4 pairs of flagella, the ultrastructure of the ventral flagella is notable for additional components in the flagellar shaft, including an intraflagellar dense rod linked to 3 axonemal doublets by fine connectives. From a consideration of analogous macroscopic systems, a preliminary hydrodynamic analysis is advanced in which the suction force of attachment follows from the pattern of fluid flow induced by the beating ventral flagella. The significance of the conclusion that cytoplasmic microtubules (or structures derived from them) apparently maintain cell shape in the face of an applied external force is discussed.

scholarly journals Fine Structure, Enzyme Histochemistry, and Immunohistochemistry of Liver in Zebrafish

2012 ◽  
Vol 295 (4) ◽  
pp. 567-576 ◽  
Author(s):  
Yilin Yao ◽  
Jinxing Lin ◽  
Ping Yang ◽  
Qiusheng Chen ◽  
Xiaohong Chu ◽  
...  
Keyword(s):  
Fine Structure ◽  
Enzyme Histochemistry

Fine Structure of Platelet Interaction with a New Microcrystalline Collagen Preparation

1974 ◽  
Vol 32 ◽  
pp. 58-59
Author(s):  
W. H. Zucker ◽  
R. G. Mason
Keyword(s):  
Fine Structure ◽  
Platelet Aggregation ◽  
Hydrochloric Acid ◽  
Whole Blood ◽  
Platelet Adhesion ◽  
Hemostatic Agent ◽  
Native Collagen ◽  
Fibrillar Morphology ◽  
Clinical Interest ◽  
New Form

Platelet adhesion initiates platelet aggregation and is an important component of the hemostatic process. Since the development of a new form of collagen as a topical hemostatic agent is of both basic and clinical interest, an ultrastructural and hematologic study of the interaction of platelets with the microcrystalline collagen preparation was undertaken.In this study, whole blood anticoagulated with EDTA was used in order to inhibit aggregation and permit study of platelet adhesion to collagen as an isolated event. The microcrystalline collagen was prepared from bovine dermal corium; milling was with sharp blades. The preparation consists of partial hydrochloric acid amine collagen salts and retains much of the fibrillar morphology of native collagen.

Pituitary Follicular Cells: Their Origin, Possible Function and Fate

1974 ◽  
Vol 32 ◽  
pp. 34-35
Author(s):  
E. Horvath ◽  
K. Kovacs ◽  
G. Penz ◽  
C. Ezrin
Keyword(s):  
Fine Structure ◽  
Secretory Granules ◽  
Follicular Cells ◽  
Human Pituitary ◽  
Rat Pituitary ◽  
Pituitary Glands ◽  
Junctional Complexes

Follicular structures, in the rat pituitary, composed of cells joined by junctional complexes and possessing few organelles and few, if any, secretory granules, were first described by Farquhar in 1957. Cells of the same description have since been observed in several species including man. The importance of these cells, however, remains obscure. While studying human pituitary glands, we have observed wide variations in the fine structure of follicular cells which may lead to a better understanding of their morphogenesis and significance.

Ultrastructure and Staining of Developing Elastic Tissue

1971 ◽  
Vol 29 ◽  
pp. 244-245
Author(s):  
E. N. Albert
Keyword(s):  
Fine Structure ◽  
Phosphotungstic Acid ◽  
Staining Method ◽  
Rat Aorta ◽  
Uranyl Acetate ◽  
The Other ◽  
Elastic Fibers ◽  
Elastic Tissue ◽  
Lead Citrate ◽  
New Born

Silver tetraphenylporphine sulfonate (Ag-TPPS) was synthesized in this laboratory and used as an electron dense stain for elastic tissue (Fig 1). The procedures for the synthesis of tetraphenylporphine sulfonate and the staining method for mature elastic tissue have been described previously.The fine structure of developing elastic tissue was observed in fetal and new born rat aorta using tetraphenylporphine sulfonate, phosphotungstic acid, uranyl acetate and lead citrate. The newly forming elastica consisted of two morphologically distinct components. These were a central amorphous and a peripheral fibrous. The ratio of the central amorphous and the peripheral fibrillar portion changed in favor of the former with increasing age.It was also observed that the staining properties of the two components were entirely different. The peripheral fibrous component stained with uranyl acetate and/or lead citrate while the central amorphous portion demonstrated no affinity for these stains. On the other hand, the central amorphous portion of developing elastic fibers stained vigorously with silver tetraphenylporphine sulfonate, while the fibrillar part did not (compare figs 2, 3, 4). Based upon the above observations it is proposed that developing elastica consists of two components that are morphologically and chemically different.

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