Ultrastructural study of experimental duodenal ulcer in a new animal model

1992 ◽  
Vol 50 (1) ◽  
pp. 614-615
Author(s):  
H.X. Bui ◽  
A. delRosario ◽  
M. Abdulla ◽  
F. Ballouk ◽  
V. Bajakian ◽  
...  
Keyword(s):  
Duodenal Ulcer ◽  
Electron Microscope ◽  
Gastric Ulcers ◽  
Ultrastructural Changes ◽  
Sprague Dawley ◽  
Polyethylene Tube ◽  
Duodenal Ulcers ◽  
Thin Sections ◽  
Experimental Duodenal Ulcer ◽  
Scanning Electron

Various animal models have often been utilized as the basis of studies of the pathophysiology of peptic ulcer disease, however the ultrastructural changes in the evolution of duodenal ulcers produced in experimental animals have not been well elucidated. Utilizing a surgical method developed for the study of gastric ulcers we have established an experimental duodenal ulcer production technique in the rat which is highly reproducible and readily standardized. In the following time sequence study of experimental duodenal ulcers we present the ultrastructural features of ulcer induction and evolution.Duodenal ulcers were produced in 150-200 gram male Sprague Dawley rats by application of 50% acetic acid for 30 seconds through a 3 mm polyethylene tube to the serosa 1.0-1.5 cm distal to the pyloric sphincter. Routine transmission and scanning electron microscopy were performed on duodenal specimens at specific time points subsequent to surgical ulcer generation. Thin sections were stained with uranyl acetate and lead citrate and examined with a Phillip's EM 300 transmission electron microscope. For SEM, specimens were post-fixed in 2% osmium for two days, coated with gold/palladium and examined with JEOL JSM-6100 scanning electron microscope (JEOL, Inc., Peabody, MA).

SEM Examination of a Used Diamond Knife

1971 ◽  
Vol 29 ◽  
pp. 452-453
Author(s):  
J. Temple Black
Keyword(s):  
Electron Microscope ◽  
High Voltage ◽  
High Magnification ◽  
Metallic Materials ◽  
Wide Spread ◽  
Thin Sections ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Scanning Electron ◽  
Diamond Knife

Since its introduction by Fernandez-Moran, the diamond knife has gained wide spread usage as a common material for cutting of thin sections of biological and metallic materials into thin films for examination in the transmission electron microscope. With the development of high voltage E.M. and scanning transmission E.M., microtomy applications will become increasingly important in the preparation of specimens. For those who can afford it, the diamond knife will thus continue to be an important tool to accomplish this effort until a cheaper but equally strong and sharp tool is found to replace the diamond, glass not withstanding.In Figs. 1 thru 3, a first attempt was made to examine the edge of a used (β=45°) diamond knife by means of the scanning electron microscope. Because diamond is conductive, first examination was tried without any coating of the diamond. However, the contamination at the edge caused severe charging during imaging. Next, a thin layer of carbon was deposited but charging was still extensive at high magnification - high voltage settings. Finally, the knife was given a light coating of gold-palladium which eliminated the charging and allowed high magnification micrographs to be made with reasonable resolution.

Observations of thick and thin sections in a field-emission SEM

1994 ◽  
Vol 52 ◽  
pp. 1018-1019
Author(s):  
W. P. Wergin ◽  
S. Roy ◽  
E. F. Erbe ◽  
C. A. Murphy ◽  
C. D. Pooley
Keyword(s):  
Electron Microscope ◽  
Field Emission ◽  
Room Temperature ◽  
Osmium Tetroxide ◽  
Uranyl Acetate ◽  
Chemical Fixation ◽  
Thin Sections ◽  
Transmission Electron ◽  
Conventional Transmission Electron Microscope ◽  
Scanning Electron

Larvae of the nematode, Steinernema carpocapsae Weiser strain All, were cryofixed and freezesubstituted for 3 days in acetone containing 2% osmium tetroxide according to established procedures. Following chemical fixation, the nematodes were brought to room temperature, embedded in Spurr's medium and sectioned for observation with a Hitachi S-4100 field emission scanning electron microscope that was equipped with an Oxford CT 1500 Cryotrans System. Thin sections, about 80 nm thick, similar to those generally used in conventional transmission electron microscope (TEM) studies were mounted on copper grids and stained with uranyl acetate for 30 min and lead citrate for 5 min. Sections about 2 μm thick were also mounted and stained in a similar fashion. The grids were mounted on an Oxford grid holder, inserted into the microscope and onto a cryostage that was operated at ambient temperature. Thick and thin sections of the larvae were evaluated and photographed in the SEM at different accelerating voltages. Figs. 4 and 5 have undergone contrast conversion so that the images would resemble transmitted electron micrographs obtained with a TEM.

scholarly journals Prevalence of Helicobacter pylori infection among patients undergoing upper gastrointestinal endoscopy

2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Vudumula Vijaya Lakshmi
Keyword(s):  
Duodenal Ulcer ◽  
Helicobacter Pylori ◽  
Normal Population ◽  
Gastric Ulcers ◽  
Upper Gastrointestinal Endoscopy ◽  
Contributing Factors ◽  
Duodenal Ulcers ◽  
Female Ratio ◽  
Ulcer Disease ◽  
H Pylori

Helicobacter pylori (H. pylori) has a role in the multifactorial etiology of peptic ulcer disease. A link between H. pylori infection and duodenal ulcer disease is now established. Other contributing factors and their interaction with the organism may initiate the ulcerative process. The fact that eradication of H. pylori infection leads to a long-term cure in the majority of duodenal ulcer patients and the fact that the prevalence of infection is higher in ulcer patients than in the normal population are cogent arguments in favor of it being the primary cause of the ulceration. This study was under taken at the Department of surgery, Narayana medical college, Nellore from January 2007 to July 2008. A total of 150 patients with duodenal ulcers, gastric ulcers, antral gastritis, gastric carcinoma and dyspepsia of any kind were studied. Maximum number of cases were in the age group of 31 years to 50 years among both sexes and number of cases gradually decreased after 50 years of age in males and females. Males were more in number and male to female ratio is (2.75:1) approximately 3:1.

Effect of vinblastine and cytochalasin B on the cytoskeletal domains in 3T3 cells

1981 ◽  
Vol 48 (1) ◽  
pp. 55-73
Author(s):  
J.H. Temmink ◽  
H. Spiele
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Cytochalasin B ◽  
Morphological Changes ◽  
Ultrastructural Changes ◽  
3T3 Cells ◽  
Cytoplasmic Material ◽  
Transmission Electron ◽  
Cytoskeletal Elements ◽  
Scanning Electron

Normal 3T3 cells were exposed to vinblastine and cytochalasin B in an attempt to correlate the morphological changes of the cell surface as seen in the scanning electron microscope with ultrastructural changes of the cytoskeletal elements as seen in critical-point-dried cells in the transmission electron microscope. Special attention was given to the changes in the cytoplasmic domains distinguished in a previous paper. Cytochalasin B primarily affects the ultrastructure of the cytocortical domain by inducing the formation of condensation foci on the cytoplasmic material. Vinblastine not only induces the depolymerization of microtubules and the perinuclear concentration of intermediate filaments, but it also causes the disappearance of stress fibres from the cortical cytoplasm and the widening of the cytocortex at the expense of the endoplasmic domain. These results support the hypothesis that the differentiation in ultrastructural domains is dependent on the spreading of the cells and their adhesion to substrate.

starch grains in macerated cells

IAWA Journal ◽  
2014 ◽  
Vol 35 (2) ◽  
pp. 155-157
Author(s):  
Vinay R. Patel ◽  
Karumanchi S. Rao
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Crucial Role ◽  
Grain Shape ◽  
Cell Cytoplasm ◽  
Thin Sections ◽  
Starch Grains ◽  
Microscope Images ◽  
Starch Grain ◽  
Scanning Electron

A modified Jeffrey’s method for localization of starch grains in wood samples macerated between 15–25 °C is described here. Time and temperature played a crucial role in maintaining starch grain shape in cell cytoplasm. Starch grain shape in macerated xylem cells was confirmed by comparison with scanning electron microscope images and thin sections (10 to 15 μm thick) from the same wood samples.

scholarly journals Assessment of the Inner Surface Microstructure of Decellularized Cortical Bone by a Scanning Electron Microscope

2019 ◽  
Vol 6 (3) ◽  
pp. 86 ◽  
Author(s):  
Jeong ◽  
Asai ◽  
Ushida ◽  
Furukawa
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Bone Cells ◽  
Sprague Dawley ◽  
Microstructural Changes ◽  
Old Adults ◽  
Skeletal Tissue ◽  
Sprague Dawley Rats ◽  
Basic Understanding ◽  
Scanning Electron

The microstructural changes of bones, which form a hierarchy of skeletal tissue, vary, depending on their condition, and are affected by the behaviors of bone cells. The purpose of this study is to assess the microstructural changes in the inner femoral surface of Sprague Dawley rats according to the conditions using a scanning electron microscope. Microstructural differences on the endocortical surface were observed in the characteristics of osteocytic canaliculi, bone fibers, and surface roughness, showing a rougher surface in old adults and an osteoporosis model by quantitative comparison. These results could be helpful for developing a basic understanding of the microstructural changes that occur on the bone surface under various conditions.

The microscopic examination of the structure of sub-surface horizons of soils

1976 ◽  
Vol 8 (6) ◽  
pp. 348-354 ◽  
Author(s):  
P Bullock ◽  
C P Murphy
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Microscopic Examination ◽  
Soil Structure ◽  
Thin Sections ◽  
X Ray ◽  
Cultural Conditions ◽  
Structural Types ◽  
Scanning Electron

What is meant by “soil structure”? Microscopic examination of thin sections of soil, using such instruments as the polarising microscope, X-ray diffractometer and scanning electron microscope has enabled a classification of the components of soils and their structural types to be built up. Now with the aid of the image-analysing computer these components can be quantified rapidly, characteristics may be calculated and their behaviour under varying cultural conditions predicted.

Effects of Changing the Type of H2-Blocker in the Treatment of H2-Blocker-Resistant Ulcers: Comparison of Roxatidine Acetate Hydrochloride and other H2-Blockers

1998 ◽  
Vol 26 (1) ◽  
pp. 25-36 ◽  
Author(s):  
K Yasutake ◽  
M Amano ◽  
Y Mizokami ◽  
S Kubota ◽  
H Fukumoto ◽  
...  
Keyword(s):  
Duodenal Ulcer ◽  
Gastric Ulcer ◽  
Receptor Antagonist ◽  
Chemical Structure ◽  
Membered Ring ◽  
Gastric Ulcers ◽  
Duodenal Ulcers ◽  
H2 Blockers ◽  
H2 Blocker ◽  
Acetate Hydrochloride

The efficacy of switching from one type of H2-receptor antagonist (H2-blocker) to another, in the treatment of H2-blocker-resistant ulcers was investigated using H2-blockers with five-membered rings (five-membered-ring agents) – such as cimetidine, ranitidine and famotidine – and an H2-blocker with a six-membered ring, roxatidine. By switching from a five-membered-ring agent to roxatidine in the treatment of five-membered-ring resistant ulcers (study I), gastric ulcers were healed in nine of 19 patients (47%) and duodenal ulcers were healed in eight of nine patients (89%). By switching from roxatidine to one of the five-membered-ring agents in the treatment of roxatidine-resistant ulcers (study II), gastric ulcer was healed in six of 15 patients (40%), and duodenal ulcer was healed in 4 of 10 patients (40%). Particularry in the case of duodenal ulcers, the switch to treatment with roxatidine, which has a different chemical structure from the five-membered-ring agents, may be useful in the treatment of five-membered-ring-resistant ulcers.

scholarly journals The original scale prediction of recurrence risk of gastroduodenal ulcer bleeding

2021 ◽  
pp. 72-78
Author(s):  
I. V. Melnyk ◽  
S. B. Soliev
Keyword(s):  
Duodenal Ulcer ◽  
Gastroduodenal Ulcer ◽  
Recurrence Risk ◽  
Gastric Ulcers ◽  
Ulcer Bleeding ◽  
Duodenal Ulcers ◽  
Results Of Treatment ◽  
Research Goal ◽  
Gastroduodenal Ulcer Bleeding

Research goal - to examine the effectiveness of active-individualized tactics in treatment of chronic gastric and duodenal ulcers. Material and methods. Analysis of treatment of 251 patients with chronic gastric and duodenal ulcer bleeding was conducted. Duodenal ulcer bleeding was present in 202 cases (80,5%), gastric ulcers were the reason of bleeding in 49 cases (19,5%). Treatment conducted according to principles of active-individualized tactics. Results. The provided characteristics and the acquired results were presented according to the fundamental components of active-individualized tactics in treatment of gastric and duodenal ulcers. Diagnostic and treatment abilities of endoscopy were determined, an unique scale of bleeding relapse risk was presented, the time limits and main indications for surgery were explained,, the role of bleeding relapse was emphasized as crucial in forming the main results of treatment of patients with bleeding gastric and duodenal ulcers. Conclusion. At present time, active-individualized tactics should be used for treatment of gastric and duodenal ulcer bleeding.

scholarly journals A brief analysis of patients suffering from stomach or duodenal ulcers in Almaty hospital №1

2015 ◽  
Vol 28 (4) ◽  
pp. 241-243
Author(s):  
Aliya Aryzbekova ◽  
Konrad Tomasz Juszkiewicz ◽  
Donald Eduard Burgess ◽  
Andrzej Polski ◽  
Ewa Poleszak
Keyword(s):  
Duodenal Ulcer ◽  
Helicobacter Pylori ◽  
Urban Areas ◽  
Gastric Ulcers ◽  
Peptic Ulcers ◽  
Drinking Alcohol ◽  
Duodenal Ulcers ◽  
Number Of Patients ◽  
Inflammatory Drugs ◽  
And Gender

AbstractPeptic ulcers are a serious problem worldwide, and affect about 4 million people each year. Their etiology is connected with the presence of Helicobacter pylori, the act of smoking, drinking alcohol, being stress, and taking excessively nonsteroidal anti-inflammatory drugs, as well as steroids. The most common symptoms are abdominal pain, nausea, chest pain and fatigue, while less frequent symptoms include vomiting and weight loss. Helicobacter pylori is responsible for about 80% of gastric and 90% of duodenal ulcer cases. In this work, an analysis is made of a correlation between stomach or duodenal ulcer and gender, residence and number of patients hospitalized in the Almaty hospital №1, from 2009-2012, in order to learn about trends in the incidence of these diseases in Kazakhstan. A total number of 950 patients with stomach and duodenal ulcers, in 2009-2012, were questioned. The patient’s residence, gender and stomach or duodenal ulcer problem were taken into account in the study. The result of this work reveals that the largest amount of hospitalized patients suffering from stomach or duodenal ulcers came from urban areas. Moreover, more women than men suffered from peptic ulcers. Furthermore, the number of patients admitted to the hospital due to duodenal ulcers did not show any variation throughout the study. However, the least number of patients suffering from gastric ulcers was noticed in December 2009, and the greatest was in October and November 2011. The obtained data show that ulcers are a serious problem in Kazakhstan.

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