A scanning electron microscopic study on dissolving process of cholesterol gallstones by chenodeoxycholic acid (CDCA)

1978 ◽  
Vol 36 (2) ◽  
pp. 522-523
Author(s):  
T. Kanetaka ◽  
M. Cho ◽  
S. Kawamura ◽  
T. Sado ◽  
K. Hara
Keyword(s):  
Electron Microscope ◽  
Chenodeoxycholic Acid ◽  
Outer Surface ◽  
Electron Microscopic ◽  
Cholesterol Gallstones ◽  
The Core ◽  
Scanning Electron Microscopic Study ◽  
Scanning Electron Microscopic ◽  
Acceleration Voltage ◽  
Scanning Electron

The authors have investigated the dissolution process of human cholesterol gallstones using a scanning electron microscope(SEM). This study was carried out by comparing control gallstones incubated in beagle bile with gallstones obtained from patients who were treated with chenodeoxycholic acid(CDCA).The cholesterol gallstones for this study were obtained from 14 patients. Three control patients were treated without CDCA and eleven patients were treated with CDCA 300-600 mg/day for periods ranging from four to twenty five months. It was confirmed through chemical analysis that these gallstones contained more than 80% cholesterol in both the outer surface and the core.The specimen were obtained from the outer surface and the core of the gallstones. Each specimen was attached to alminum sheet and coated with carbon to 100Å thickness. The SEM observation was made by Hitachi S-550 with 20 kV acceleration voltage and with 60-20, 000X magnification.

Scanning Electron Microscopic Study of the Eggs of the Warthog Louse (Haematopinus Phacochoeri)

1997 ◽  
Vol 3 (S2) ◽  
pp. 113-114
Author(s):  
C. Baker ◽  
E.D. Green
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Environmental Changes ◽  
General Structure ◽  
Electron Microscopic ◽  
Razor Blade ◽  
Scanning Electron Microscopic Study ◽  
Sem Study ◽  
Scanning Electron Microscopic ◽  
Scanning Electron

The large eggs of Haematopinus phacochoeri are found attached to the long dorsal mane bristles of the diurnal warthog. The eggs are generally exposed to great environmental stresses such as excessive sunlight and temperature as well as the occasional plunge under water or mud during grooming. This investigation was therefore undertaken to determine how the eggs of H. phococoeri are adapted to tolerate the various environmental changes it is constantly exposed to. To our knowledge no other SEM study on the eggs of this species has been performed.Specimens still attached to the bristles were fixed in 70% ethanol, dehydrated and ultrasonically cleaned. Some eggs were longitudinally sectioned with a razor blade to expose the chorionic layers. The eggs were critical point dried in liquid CO2, mounted and viewed by means of a Leica Stereoscan 420 scanning electron microscope.The general structure of the shell consists of two layers of chorion, i.e. the endo-and exochorion. These two layers are attached at the pre-formed line of weakness at the operculum and again near the hydropyle. Elsewhere these two layers are completely separated by the respiratory layer.

Microvascular Anastomosis: A Scanning Electron Microscopic Study

1980 ◽  
Vol 88 (3) ◽  
pp. 252-256 ◽  
Author(s):  
Douglas E. Mattox
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Microscope ◽  
Microvascular Anastomosis ◽  
Electron Microscopic ◽  
Technical Errors ◽  
Scanning Electron Microscopic Study ◽  
Scanning Electron Microscopic ◽  
Scanning Electron

The single most important factor determining the patency of a microvascular anastomosis is the surgical precision with which it is performed. Inaccurately placed sutures, damage of the intima, exposed media and adventitia, and stenosis of the lumen at the site anastomosis all contribute to decreased patency rates. The first 50 consecutive microvascular anastomoses performed by a single microvascular surgeon were analyzed in vivo and with the scanning electron microscope. The frequency and significance of various technical errors are discussed. Scanning electron microscopy is recommended as a convenient and quick technique for assessing the evenness and accuracy of intimal apposition in microvascular anastomosis.

Additional taxonomic studies on Avena fatuoids: some morphological attributes seen using the scanning electron microscope

1971 ◽  
Vol 49 (5) ◽  
pp. 647-649 ◽  
Author(s):  
Bernard R. Baum
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Avena Fatua ◽  
The Other ◽  
Electron Microscopic ◽  
Morphological Attributes ◽  
Scanning Electron Microscopic Study ◽  
Scanning Electron Microscopic ◽  
Taxonomic Studies ◽  
Scanning Electron

This paper describes and evaluates the results of a scanning electron microscopic study of the sculpture of the surfaces of caryopses, glumes, lemmas, awn columns, and awn subules of Avena fatua, normal cultivated oats (A. sativa), fatuoids, and F1 hybrids A. fatua × sativa. Only qualitative differences were sought, and none were detected in the glumes and on the caryopses. The prickles on the lemmas, on the awn columns, and on the awn subules all appear in two character states. In the case of the lemmas one state is found in the normal cultivated oats, fatuoids, and F1 hybrids, and the other in A. fatua. On the other hand in the awn subules one state is found in the normal cultivated oats and the other in fatuoids, F1 hybrids, and A. fatua, while in the awn columns one state occurs in cultivated oats and the other in A. fatua, but in the F1 hybrids and fatuoids both states occur. These findings provide taxonomic evidence additional to that described earlier based on lodicules coupled with traditional characters.

scholarly journals Surface Morphological Changes in Human Enamel Following Bleaching: An in vitro Scanning Electron Microscopic Study

2012 ◽  
Vol 13 (3) ◽  
pp. 405-415 ◽  
Author(s):  
LM Ranganath ◽  
B Sunil Rao ◽  
AG Rajesh ◽  
KS Prem Kumar
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Morphological Changes ◽  
Carbamide Peroxide ◽  
Electron Microscopic ◽  
Human Enamel ◽  
Scanning Electron Microscopic Study ◽  
Scanning Electron Microscopic ◽  
Scanning Electron

ABSTRACT Objective The purpose of this study was to evaluate, using scanning electron microscopy (SEM), the morphological and structural changes of the enamel induced by three bleaching agents namely old McInnes solution, modified McInnes solution and 10% carbamide peroxide gel at different time intervals. Materials and methods Fifteen freshly extracted noncarious human central incisors with intact enamel surface were selected. The teeth were sectioned at the cementoenamel junction separating the crown portion from the root using a diamond separating disk. Following this, the samples were subjected to three different bleaching agents: Group 1: Old McInnes solution, group 2: modified McInnes solution and group 3: 10% carbamide peroxide for a period of 15, 30 and 60 minutes, 24 and 30 hours time interval. The sample stubs were subjected to scanning electron microscope and were photographed at 2000 and 10,000 magnifications. Conclusion The present study revealed no indication of either etching or significant change in surface morphology of enamel when evaluated under scanning electron microscope after 6 weeks treatment with various bleaching agents. Clinical significance Morphological alterations in bleached enamel are both concentration and time dependent. How to cite this article Rajesh AG, Ranganath LM, Kumar KSP, Rao BS. Surface Morphological Changes in Human Enamel Following Bleaching: An in vitro Scanning Electron Microscopic Study. J Contemp Dent Pract 2012;13(3):405-415.

A scanning electron microscopic study of epicuticular waxes of glumesin Avena magna, A. murphyi, and A. sterilis

1973 ◽  
Vol 51 (12) ◽  
pp. 2381-2383 ◽  
Author(s):  
B. R. Baum ◽  
V. E. Hadland
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Microscopic Study ◽  
Electron Microscopic Study ◽  
Epicuticular Waxes ◽  
Electron Microscopic ◽  
Avena Species ◽  
Scanning Electron Microscopic Study ◽  
Scanning Electron Microscopic ◽  
Scanning Electron

The ultrastructure of epicuticular glume waxes in two tetraploid Avena species, A. magna and A. murphyi, and in one hexaploid species, A. sterilis, has been studied and documented with the aid of the scanning electron microscope (SEM). The usefulness of this approach for taxonomy and diagnostic purposes has been evaluated, and the specific configurations of those epicuticular waxes compared in relation to the genomes.

A Scanning Electron Microscopic Study of Platelets of Certain Animal Species

1975 ◽  
Vol 33 (03) ◽  
pp. 501-507 ◽  
Author(s):  
N. C Jain
Keyword(s):  
Electron Microscope ◽  
Smooth Surface ◽  
Animal Species ◽  
Comparative Morphology ◽  
Surface Irregularity ◽  
Electron Microscopic ◽  
Scanning Electron Microscopic Study ◽  
Scanning Electron Microscopic ◽  
Stored Blood ◽  
Scanning Electron

SummaryComparative morphology of platelets of the dog, cat, cow, horse, sheep, and goat was studied with the scanning electron microscope and was found generally similar. Most of the platelets were slightly biconvex or flat with relatively smooth surface and even contour. Some of these platelets had few short marginal filaments, or small shallow depressions or tiny protuberances on the surface. A small number of platelets exhibited surface irregularity and few long pseudopods which were thought to result from platelet activation during the processing of blood. The number of such irregular platelets increased in stored blood and in blood fixed at 4° C.

A Light and Scanning Electron Microscopic Study of Enamel Decalcification in Children Living in a Water-fluoridated Area

1990 ◽  
Vol 69 (10) ◽  
pp. 1626-1633 ◽  
Author(s):  
A. Thylstrup ◽  
R.M. Boyar ◽  
L. Holmen ◽  
G.H. Bowden
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Dental Fluorosis ◽  
Electron Microscopic ◽  
Crystal Dissolution ◽  
Scanning Electron Microscopic Study ◽  
Scanning Electron Microscopic ◽  
Time Periods ◽  
Short Time ◽  
Scanning Electron

Eleven children, each having one or two pairs of premolars to be extracted for orthodontic purposes, participated in the study. The model involved placement of a special orthodontic band that allowed the accumulation of plaque in a defined area between the band and the buccal enamel. Examination of enamel changes was carried out in experimental teeth that had been exposed to local plaque accumulation for one, two, four, eight, or 14 days. The specimens were examined under the light (LM) and the scanning electron microscope (SEM). All teeth had signs of very mild dental fluorosis. No indications of demineralization were noted after one day. SEM examination showed signs of crystal dissolution in some of the two-day specimens. Six of eight four-day specimens exhibited surface dissolution. All eight- and 14-day specimens showed signs of surface demineralization in the LM as well as in the SEM. These observations documented that undisturbed bacterial deposits are capable of initiating enamel demineralization within short time periods, even in children living in a water-fluoridated area.

The epicuticular waxes of glumes of Avena: a scanning electron microscopic study of the morphological patterns in all the species

1975 ◽  
Vol 53 (16) ◽  
pp. 1712-1718 ◽  
Author(s):  
B. R. Baum ◽  
V. E. Hadland
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
The Other ◽  
Epicuticular Waxes ◽  
Electron Microscopic ◽  
Scanning Electron Microscopic Study ◽  
Special Cases ◽  
Scanning Electron Microscopic ◽  
Scanning Electron ◽  
Morphological Patterns

The epicuticular waxes of glumes of 357 samples, representing all the 27 species of the genus Avena. were examined under the scanning electron microscope. Three basic patterns were discerned, plates, knobs, and filaments, and each sample has been scored for the types found. A fourth category of unstructural pattern has also been scored. Variability within patterns was observed but not scored. It is concluded that epicuticular waxes on glumes in Avena cannot be used for identification of specimens to species except for various special cases when the choice to be made is between two or three alternatives. The main finding is that the degree of variability of the patterns is inversely proportional to the ploidy level. The hexaploid species consist almost exclusively of filaments: the other species have all the three basic patterns, with some species possessing a high proportion of only two patterns.

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