scholarly journals A Monomeric Methyl and Hydroxypropyl Methacrylate Injection Medium and Its Utility in Casting Blood Capillaries and Liver Bile Canaliculi for Scanning Electron Microscopy

1984 ◽  
Vol 47 (2) ◽  
pp. 223-237 ◽  
Author(s):  
Takuro MURAKAMI ◽  
Tatsuya ITOSHIMA ◽  
Kusukuma HITOMI ◽  
Aiji OHTSUKA ◽  
Albert L. JONES
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Bile Canaliculi ◽  
Blood Capillaries ◽  
Hydroxypropyl Methacrylate ◽  
Scanning Electron

Current Applications and Methods of Microvascular Corrosion Casting: A Review

1998 ◽  
Vol 4 (S2) ◽  
pp. 908-909
Author(s):  
A. Lametschwandtner ◽  
H. Aichhorn ◽  
B. Minnich
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Great Depth ◽  
Corrosion Casting ◽  
Corrosion Casts ◽  
Depth Of Focus ◽  
Subsequent Removal ◽  
Blood Capillaries ◽  
Qualitative And Quantitative ◽  
Scanning Electron

Casting of hollow spaces with solidifying materials and subsequent removal of surrounding tissues by corrosive alkali and acids and the inspection of the remaining casts by bare eyes or the dissecting microscope is an old anatomical technique.The introduction of polymerizing resins as casting materials which resulted in durable casts of even the smallest spaces (bile and blood capillaries) and the application of the scanning electron microscope with its high resolution and great depth of focus, enabled the qualitative and the quantitative analysis of the 3D-arrangement of tubular systems by means of their casts.Presently, scanning electron microscopy of microvascular corrosion casts is used to study growing, stable or regressing blood vessel systems under physiological (e.g. during development, wound healing, metamorphosis) and pathological (e.g. tumor angiogenesis) conditions in qualitative and quantitative terms.

Histomorphology and scanning electron microscopy of the pharyngeal tonsil in goats

2016 ◽  
Author(s):  
V. R. Indu ◽  
K. M. Lucy ◽  
N. Ashok ◽  
S. Maya ◽  
V. L. Gleeja
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Lymphoid Tissue ◽  
Average Diameter ◽  
Goblet Cells ◽  
Surface Epithelium ◽  
Blood Capillaries ◽  
Follicle Associated Epithelium ◽  
Scanning Electron ◽  
Pharyngeal Tonsil

Gross and histological studies were conducted on the pharyngeal tonsil of six male crossbred goats of six months of age. In the nasopharynx, pharyngeal tonsil was located on the caudal part of the pharyngeal septum and was 5.54±1.41cm long and 2.19±0.92cm wide. It presented numerous longitudinally arranged primary and secondary folds. Histologically the tonsil was lined by pseudostratified ciliated columnar epithelium comprising of 8-14 rows of nuclei of three types of cells, viz. basal, supporting and goblet cells. This epithelium was transformed at places into follicle-associated epithelium (FAE) and was characterized by decreased height of the epithelial cells, absence of cilia and goblet cells and heavy infiltration of lymphocytes through the interrupted basement membrane. The height of surface epithelium was 87.33± 1.20μm and that of follicle-associated epithelium was 52.33± 5.21μm. Propria-submucosa comprised of a central axis of loosely arranged connective tissue with dense aggregates of lymphoid tissue, fine blood capillaries and few nerve fibres folded around it. The cryptolymphatic units and tonsillar nodules of varying shape and dimensions constituted the majority of the lymphoid tissue. The average diameter of lymphoid nodules was 921.67±8.72μm and the lymphocyte count per nodule was 32233.23±324.24. The average number of lymphatic nodules counted per field under low power magnification of microscope was 2.5±0.43 and the internodular distance was 29.83±1.40μm. In scanning electron microscopy surface of the pharyngeal tonsil was covered by two types of epithelium viz., the ciliated respiratory surface epithelium and the FAE consisting predominantly of three types of non-ciliated microvillus cells.

Pathogenesis of Human Hair Defects

1974 ◽  
Vol 32 ◽  
pp. 12-13
Author(s):  
P.S. Porter ◽  
T. Aoyagi ◽  
R. Matta
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Human Hair ◽  
Standard Techniques ◽  
Scanning Electron

Using standard techniques of scanning electron microscopy (SEM), over 1000 human hair defects have been studied. In several of the defects, the pathogenesis of the abnormality has been clarified using these techniques. It is the purpose of this paper to present several distinct morphologic abnormalities of hair and to discuss their pathogenesis as elucidated through techniques of scanning electron microscopy.

Ultrastructural Analysis of the Salivary Glands of Gromphadorhina Portentosa (Schaum)

1977 ◽  
Vol 35 ◽  
pp. 638-639
Author(s):  
P.J. Dailey
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Salivary Glands ◽  
Secretory Vesicles ◽  
The Past ◽  
Transmission Electron ◽  
Means Of Transmission ◽  
Gromphadorhina Portentosa ◽  
Scanning Electron ◽  
Topographical Relief

The structure of insect salivary glands has been extensively investigated during the past decade; however, none have attempted scanning electron microscopy (SEM) in ultrastructural examinations of these secretory organs. This study correlates fine structure by means of SEM cryofractography with that of thin-sectioned epoxy embedded material observed by means of transmission electron microscopy (TEM).Salivary glands of Gromphadorhina portentosa were excised and immediately submerged in cold (4°C) paraformaldehyde-glutaraldehyde fixative1 for 2 hr, washed and post-fixed in 1 per cent 0s04 in phosphosphate buffer (4°C for 2 hr). After ethanolic dehydration half of the samples were embedded in Epon 812 for TEM and half cryofractured and subsequently critical point dried for SEM. Dried specimens were mounted on aluminum stubs and coated with approximately 150 Å of gold in a cold sputtering apparatus.Figure 1 shows a cryofractured plane through a salivary acinus revealing topographical relief of secretory vesicles.

Two- or three-way observations of the identical cell elements within the same sections by LM, TEM and/or SEM

1978 ◽  
Vol 36 (2) ◽  
pp. 82-83 ◽  
Author(s):  
Nakazo Watari ◽  
Yasuaki Hotta ◽  
Yoshio Mabuchi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Fine Structure ◽  
Light Microscopy ◽  
Thin Sections ◽  
Transmission Electron ◽  
Identical Cell ◽  
Electron Microscopes ◽  
Scanning Electron

It is very useful if we can observe the identical cell elements within the same sections by light microscopy (LM), transmission electron microscopy (TEM) and/or scanning electron microscopy (SEM) sequentially, because, the cell fine structure can not be indicated by LM, while the color is; on the other hand, the cell fine structure can be very easily observed by EM, although its color properties may not. However, there is one problem in that LM requires thick sections of over 1 μm, while EM needs very thin sections of under 100 nm. Recently, we have developed a new method to observe the same cell elements within the same plastic sections using both light and transmission (conventional or high-voltage) electron microscopes.In this paper, we have developed two new observation methods for the identical cell elements within the same sections, both plastic-embedded and paraffin-embedded, using light microscopy, transmission electron microscopy and/or scanning electron microscopy (Fig. 1).

Spontaneous Cataract in Nude Athymic Mice

1977 ◽  
Vol 35 ◽  
pp. 512-513
Author(s):  
Ronald H. Bradley ◽  
R. S. Berk ◽  
L. D. Hazlett
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Nude Mouse ◽  
Cellular Immunity ◽  
Phosphate Buffer ◽  
Osmium Tetroxide ◽  
Athymic Mice ◽  
Transmission Microscopy ◽  
Mouse Lens ◽  
Scanning Electron

The nude mouse is a hairless mutant (homozygous for the mutation nude, nu/nu), which is born lacking a thymus and possesses a severe defect in cellular immunity. Spontaneous unilateral cataractous lesions were noted (during ocular examination using a stereomicroscope at 40X) in 14 of a series of 60 animals (20%). This transmission and scanning microscopic study characterizes the morphology of this cataract and contrasts these data with normal nude mouse lens.All animals were sacrificed by an ether overdose. Eyes were enucleated and immersed in a mixed fixative (1% osmium tetroxide and 6% glutaraldehyde in Sorenson's phosphate buffer pH 7.4 at 0-4°C) for 3 hours, dehydrated in graded ethanols and embedded in Epon-Araldite for transmission microscopy. Specimens for scanning electron microscopy were fixed similarly, dehydrated in graded ethanols, then to graded changes of Freon 113 and ethanol to 100% Freon 113 and critically point dried in a Bomar critical point dryer using Freon 13 as the transition fluid.

Scanning and Transmission Microscopy of Nematocyst Batteries in Epitheliomuscular Cells of Hydra

1971 ◽  
Vol 29 ◽  
pp. 410-411 ◽  
Author(s):  
Jane A. Westfall ◽  
S. Yamataka ◽  
Paul D. Enos
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Osmium Tetroxide ◽  
External Surface ◽  
Three Dimensional ◽  
Surface Structures ◽  
Transmission Microscopy ◽  
Transmission Electron ◽  
Freeze Dried ◽  
Scanning Electron

Scanning electron microscopy (SEM) provides three dimensional details of external surface structures and supplements ultrastructural information provided by transmission electron microscopy (TEM). Animals composed of watery jellylike tissues such as hydras and other coelenterates have not been considered suitable for SEM studies because of the difficulty in preserving such organisms in a normal state. This study demonstrates 1) the successful use of SEM on such tissue, and 2) the unique arrangement of batteries of nematocysts within large epitheliomuscular cells on tentacles of Hydra littoralis.Whole specimens of Hydra were prepared for SEM (Figs. 1 and 2) by the fix, freeze-dry, coat technique of Small and Màrszalek. The specimens were fixed in osmium tetroxide and mercuric chloride, freeze-dried in vacuo on a prechilled 1 Kg brass block, and coated with gold-palladium. Tissues for TEM (Figs. 3 and 4) were fixed in glutaraldehyde followed by osmium tetroxide. Scanning micrographs were taken on a Cambridge Stereoscan Mark II A microscope at 10 KV and transmission micrographs were taken on an RCA EMU 3G microscope (Fig. 3) or on a Hitachi HU 11B microscope (Fig. 4).

Microbulldozing and Microchiseling

1969 ◽  
Vol 27 ◽  
pp. 134-135
Author(s):  
J.N. Ramsey ◽  
D.P. Cameron ◽  
F.W. Schneider
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Material Handling ◽  
Microprobe Analysis ◽  
Foreign Matter ◽  
Specific Location ◽  
Potential Problems ◽  
Knoop Indenter ◽  
Scanning Electron ◽  
Microhardness Tester

As computer components become smaller the analytical methods used to examine them and the material handling techniques must become more sensitive, and more sophisticated. We have used microbulldozing and microchiseling in conjunction with scanning electron microscopy, replica electron microscopy, and microprobe analysis for studying actual and potential problems with developmental and pilot line devices. Foreign matter, corrosion, etc, in specific locations are mechanically loosened from their substrates and removed by “extraction replication,” and examined in the appropriate instrument. The mechanical loosening is done in a controlled manner by using a microhardness tester—we use the attachment designed for our Reichert metallograph. The working tool is a pyramid shaped diamond (a Knoop indenter) which can be pushed into the specimen with a controlled pressure and in a specific location.

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