scholarly journals CHARACTERISTICS OF SMALL INTESTINE STRUCTURAL COMPONENTS IN INTACT AND CONTROL RATS

2019 ◽  
Vol 19 (4) ◽  
pp. 105-109
Author(s):  
K.V. Shepitko
Keyword(s):  
Small Intestine ◽  
Layer Thickness ◽  
Saline Solution ◽  
Morphometric Parameters ◽  
Laboratory Animals ◽  
Structural Components ◽  
Group I ◽  
Group Control ◽  
The Difference ◽  
Intact Rats

Chronic enteritis is manifested by the number of changes in the mucous membranes over three divisions of the small intestine. Morphologically this is presented by tissues atrophy and sclerosis, by changes in its architecture, and enterocyte adhesions. This results in the functional disorders including the lipid metabolism impairment, the suppression of the exocrinocyte functioning, and some others, but the size of exocrine glands along the length of the small intestine is still unchanged. The small intestine is an actively functioning organ. Its villi and folds expand the area of the mucous membrane in almost 500 times; while the area of the small intestine active surface, which can come into direct contact with various affecting factors, is 200-300 m2. Therefore, the small intestine is still requiring more detailed study. However, the reports on comparing data on the morphological features of the small intestinal wall in white rats of the Wistar line, which are the most commonly used in experiments, are far from being as multitudinous in the medical and experimental literature as it was expected. This study was aimed at identifying and comparing the peculiarities in the structure and morphofunctional parameters of small intestine in rats. The study of the morphofunctional status of structural components in the small intestine (duodenum, hollow, iliac) wall was performed on 60 sexually mature Wistar male rats weighing 140-190 g, which were kept under standard conditions of the vivarium, Ukrainian Medical Stomatological Academy. All the manipulations with animals were carried out in accordance with the “Rules for the Use of Laboratory Animals” (2006, Annex 4) and the mandates of the Declaration of Helsinki and the Guide for the Care and Use of Laboratory Animals. The animals were divided into 4 groups: Group I included intact rats (n=15); Group (control) II included rats, which had their outer thigh incised (n=15); Group (control) III included animals treated intraperitoneally with 1 ml of saline solution (n=15); Group (control) IV included animals, which were given injections of 1 ml of saline solution intraperitoneally and had their outer thigh incised (n=15). The studying the structure of the small intestine wall in rats has demonstrated this of control animals does not differ from that in the group I intact rats. A deeper analysis has been performed by using morphometric methods to find out statistically significant differences between the parameters studied. The statistical analysis has shown that the morphometric parameters (overall wall thickness, mucosal layer thickness, submucous layer thickness, muscular layer thickness, and serous layer sickness) of the small intestine (duodenum, jejunum,ilium) in the rats of control groups (II, III, IV respectively) during all study periods demonstrate no statistically significant difference. The difference reliability was insignificant at p> 0.05. Comparison of these indices with those in the intact group has pointed out that the difference reliability was also insignificant (p> 0.05). This fact will enable to carry out further comparing the studied morphometric parameters using the values presented by the intact rats only, without using data obtained in the control group of the rats.

scholarly journals EFFECT OF IMUNOPHAN ON MORPHOMETRIC PARAMETERS AND HISTOLOGICAL STRUCTURE OF PEYER'S PATCHES IN SMALL INTESTINE OF RATS UNDER IMMUNOSUPPRESSION INDUCED BY CYCLOPHOSPHAN

2021 ◽  
pp. 141-152
Author(s):  
E.N. Morozova ◽  
V.N. Morozov ◽  
A.V. Tverskaya
Keyword(s):  
Small Intestine ◽  
Lymph Nodes ◽  
White Male ◽  
Morphometric Parameters ◽  
Peyer's Patches ◽  
Male Rats ◽  
Histological Structure ◽  
Peyer’S Patches ◽  
Group 2 ◽  
Intact Rats

The aim of the study is to analyze morphometric parameters and histological structure of Peyer's patches in the small intestine of rats after imunofan administration under immunosuppression caused by cyclophosphan. Materials and Methods. The study was carried out on 36 white male rats (210–250 gramms). The animals were divided into two groups. Rats of Group 1 were injected with cyclophosphamide on the 1st day of the experiment (200 mg/kg). On the 2nd, 4th, 6th, 8th and 10th days they received imunofan (0.7 μg/kg). Group 2 consisted of intact rats. The animals were withdrawn from the experiment on the 7th, 30th, and 90th days after imunofan administration. The authors measured the length and width of Peyer's patches, and the distance from the ileocecal angle to the first patch. We also examined the height and width of lymph nodes and internodal zones on histological sections. Results. On the 7th and 30th days of our study the length and width of Peyer's patches increased by 18.71 %/16.94 % and 3.56 %/24.22 % respectively in mature animals, compared with the intact rats. At the same time, the distance from the ileocecal angle to the 1st Peyer’s patch decreased by 6.15 % and 19.80 %. The micrography showed that the height and width of the lymph nodes of Peyer's patches in experimental animals increased by 29.79 %/12.73 % (Day 7) and 10.49 %/12.46 % (Day 30) in comparison with the intact rats. The linear sizes of internodal zones increased by 39.35 %/10.33 % (Day 7) and 4.77 %/4.25 % (Day 30). By the 90th day, the macroscopic parameters of Peyer's patches, the height and width of their lymph nodules and internodal zones approxomated those of intact animals. Conclusion. When using imunofan under experimental immunosuppression, macro- and micromorphometric parameters of Peyer's patches of the small intestine of mature rats gradually approximated those in intact rats, which indicated the leveling of cyclophosphan immunosuppressive effect. Key words: rats, small intestine, Peyer's patches, imunofan, cyclophosphan. Цель исследования – изучение морфометрических параметров и гистологического строения пейеровых бляшек тонкой кишки крыс после введения имунофана на фоне иммуносупрессии, вызванной циклофосфаном. Материалы и методы. Исследование проводилось на 36 белых крысах-самцах массой 210–250 г. Животные были разделены на две группы. В I группе крысам в 1-е сут эксперимента вводился циклофосфан в дозе 200 мг/кг, на 2, 4, 6, 8, 10-е сут – имунофан в дозе 0,7 мкг/кг массы тела; II группу составили интактные крысы. Животные выводились из эксперимента на 7, 30, 90-е сут после завершения введения имунофана. Измерялись длина и ширина пейеровых бляшек, а также расстояние от илеоцекального угла до первой из них, а на гистологических срезах – высота и ширина их лимфатических узелков и межузелковых зон. Результаты. У половозрелых животных на 7-е и 30-е сут наблюдения длина и ширина пейеровых бляшек увеличивалась на 18,71 и 16,94 % и 3,56 и 24,22 % соответственно по сравнению с данными интактных крыс, а расстояние от илеоцекального угла до первой из них уменьшалось на 6,15 и 19,80 %. При микроскопическом исследовании высота и ширина лимфатических узелков пейеровых бляшек были больше по сравнению с данными интактных крыс на 29,79 и 12,73 % (7-е сут), 10,49 и 12,46 % (30-е сут), а линейные размеры межузелковых зон – на 39,35 и 10,33 % (7-е сут), 4,77 и 4,25 % (30-е сут). К 90-м сут макроскопические параметры пейеровых бляшек, а также высота и ширина их лимфатических узелков и межузелковых зон приближались к данным интактных животных. Выводы. При использовании имунофана на фоне экспериментальной иммуносупрессии значения исследуемых макро- и микроморфометрических параметров пейеровых бляшек тонкой кишки половозрелых крыс в ходе эксперимента постепенно приближались к аналогичным показателям интактных крыс, что свидетельствует о нивелировании иммуносупрессивного эффекта циклофосфана. Ключевые слова: крысы, тонкая кишка, пейеровы бляшки, имунофан, циклофосфан.

Electron probe x-ray microanalysis and electron microscopy of amino acid absorption and transport by the small intestine: inhibition by chemical poisons and correlation to the elemental composition of the epithelial cells

1986 ◽  
Vol 44 ◽  
pp. 134-135
Author(s):  
A. J. Tousimis
Keyword(s):  
Small Intestine ◽  
Amino Acid ◽  
Epithelial Cells ◽  
Elemental Composition ◽  
Isotope Labeling ◽  
Structural Components ◽  
X Ray ◽  
Human Small Intestine ◽  
Transport Studies

The elemental composition of amino acids is similar to that of the major structural components of the epithelial cells of the small intestine and other tissues. Therefore, their subcellular localization and concentration measurements are not possible by x-ray microanalysis. Radioactive isotope labeling: I131-tyrosine, Se75-methionine and S35-methionine have been successfully employed in numerous absorption and transport studies. The latter two have been utilized both in vitro and vivo, with similar results in the hamster and human small intestine. Non-radioactive Selenomethionine, since its absorption/transport behavior is assumed to be the same as that of Se75- methionine and S75-methionine could serve as a compound tracer for this amino acid.

scholarly journals Investigations on the Optical Properties of InGaN/GaN Multiple Quantum Wells with Varying GaN Cap Layer Thickness

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Xiaowei Wang ◽  
Feng Liang ◽  
Degang Zhao ◽  
Zongshun Liu ◽  
Jianjun Zhu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Wells ◽  
Layer Thickness ◽  
Stark Effect ◽  
Chemical Vapor ◽  
Multiple Quantum ◽  
Three Samples ◽  
Measurement Results ◽  
Cap Layer ◽  
The Difference

Abstract Three InGaN/GaN MQWs samples with varying GaN cap layer thickness were grown by metalorganic chemical vapor deposition (MOCVD) to investigate the optical properties. We found that a thicker cap layer is more effective in preventing the evaporation of the In composition in the InGaN quantum well layer. Furthermore, the quantum-confined Stark effect (QCSE) is enhanced with increasing the thickness of GaN cap layer. In addition, compared with the electroluminescence measurement results, we focus on the difference of localization states and defects in three samples induced by various cap thickness to explain the anomalies in room temperature photoluminescence measurements. We found that too thin GaN cap layer will exacerbates the inhomogeneity of localization states in InGaN QW layer, and too thick GaN cap layer will generate more defects in GaN cap layer.

Inhibition of cardiac vagal component of baroreflex by group III and IV afferents

1991 ◽  
Vol 260 (3) ◽  
pp. H730-H734 ◽  
Author(s):  
P. N. McWilliam ◽  
T. Yang
Keyword(s):  
Peroneal Nerve ◽  
Baroreceptor Reflex ◽  
Interval Prolongation ◽  
Group Iii ◽  
Control Value ◽  
Pressure Elevation ◽  
Group I ◽  
Afferent Fibers ◽  
The Difference ◽  
The Right

The action of electrically evoked activity in somatic afferent fibers on the sensitivity of the baroreceptor reflex was examined in decerebrate cats. The sensitivity of the reflex was expressed as the difference between the maximum prolongation of R-R interval in response to carotid sinus pressure elevation and the mean of 10 R-R intervals immediately before pressure elevation. The control value of R-R interval prolongation was 192 +/- 50 ms. Stimulation (10 Hz) of group I and II fibers of the right peroneal nerve (evoked volleys recorded from the sciatic nerve) had no effect on R-R interval prolongation (171 +/- 45 ms). Recruitment of group III fibers (10 Hz) conducting at 23.6 +/- 0.65 m/s reduced the prolongation of R-R interval to 52 +/- 14 ms. Recruitment of group IV fibers (10 Hz) conducting less than 2.5 m/s further reduced the prolongation of R-R interval to 1.0 +/- 8.0 ms. It is concluded that the inhibition of the cardiac vagal component of the baroreceptor reflex produced by electrical stimulation of the peroneal nerve is mediated by afferent fibers of groups III and IV.

Seasonal variations in wool growth and heat tolerance of sheep. I. Wool growth

1960 ◽  
Vol 11 (1) ◽  
pp. 75 ◽  
Author(s):  
M Wodzicka
Keyword(s):  
Body Weight ◽  
Day Treatment ◽  
The Other ◽  
Seasonal Rhythm ◽  
Group Iii ◽  
Wool Growth ◽  
Group I ◽  
The Mean ◽  
Group Ii ◽  
The Difference

The monthly wool growth of three groups of rams was studied at Beltsville, Maryland. Group I received natural daylight (at 38° 53' N.) and was shorn monthly. Group II had a 7:17 hours of daylight to hours of darkness rhythm and was shorn every 6 months, once in winter and once in summer. Group III received natural daylight and was likewise shorn every 6 months. The rams of all groups produced more wool in summer than in winter. This difference was significant (P<0.001). The mean body weight and food intake were both greater in the winter months, which indicated that the seasonal rhythm of wool growth was not a consequence of poorer feeding in winter. The rams which were shorn monthly (group I) grew considerably more wool than the other two groups, but the difference was not statistically significant. The short-day treatment of group II did not increase the annual wool production nor decrease the seasonal rhythm of wool growth. The balance of evidence from this and other experiments indicates that temperature rather than light controls the seasonal rhythm of wool growth.

Mortality rates and risk factors for asymptomatic deep vein thrombosis in medical patients

2005 ◽  
Vol 93 (01) ◽  
pp. 76-79 ◽  
Author(s):  
Alain Leizorovicz ◽  
Alexander Cohen ◽  
Alexander Turpie ◽  
Carl-Gustav Olsson ◽  
Samuel Goldhaber ◽  
...  
Keyword(s):  
Risk Factors ◽  
Deep Vein Thrombosis ◽  
Mortality Rates ◽  
Hazard Ratio ◽  
Group Iii ◽  
Vein Thrombosis ◽  
Group I ◽  
Compression Ultrasound ◽  
The Difference ◽  
Deep Vein

SummaryThe clinical importance of asymptomatic proximal and distal deep vein thrombosis (DVT) remains uncertain and controversial. The aim of this retrospective,post-hoc analysis was to examine mortality and risk factors for development of proximal DVT in hospitalized patients with acute medical illness who were recruited into a randomized, prospective clinical trial of thromboprophylaxis with dalteparin (PREVENT).We analyzed 1738 patients who had not sustained a symptomatic venous thromboembolic event by Day 21 and who had a complete compression ultrasound of the proximal and distal leg veins on Day 21. We examined the 90-day mortality rates in patients with asymptomatic proximal DVT (Group I, N = 80), asymptomatic distal DVT (Group II, N = 118) or no DVT (Group III, N = 1540).The 90-day mortality rates were 13.75%, 3.39%, and 1.92% for Groups I–III, respectively. The difference in mortality between Group I and Group III was significant (hazard ratio 7.63, 95% CI = 3.8–15.3;p < 0.0001),whereas the difference between Groups II and III did not reach significance (hazard ratio 1.36, 95% CI = 0.41–4.45).The association of asymptomatic proximal DVT with increased mortality remained highly significant after adjusting for differences in baseline demographics and clinical variables. Risk factors significantly associated with the development of proximal DVT included advanced age (p = 0.0005), prior DVT (p = 0.001), and varicose veins (p = 0.04). In conclusion, the high mortality rate in patients with asymptomatic proximal DVT underscores its clinical relevance and supports targeting of asymptomatic proximal DVT as an appropriate endpoint in clinical trials of thromboprophylaxis.

Compare the Incidence of Surgical Site Infection after Appendectomy Wound Irrigation with Normal Saline and Imipenem Solutions

2021 ◽  
Vol 15 (8) ◽  
pp. 2184-2186
Author(s):  
Ahmad Shah ◽  
Nazeer Ahmad Sasoli ◽  
Farrukh Sami
Keyword(s):  
Surgical Site Infection ◽  
Wound Infection ◽  
Saline Solution ◽  
Abscess Formation ◽  
Site Infection ◽  
Wound Irrigation ◽  
Group I ◽  
Perforated Appendix ◽  
The Mean ◽  
Group Ii

Objective: To compare the incidence of surgical site infection after appendectomy wound irrigation with regular saline solution and imipenem solution. Study Design: Comparative randomized control trial Place and Duration of Study: Department of Surgery Unit-1, Sandeman Provincial Hospital Quetta from 1st September 2020 to 30th April 2021. Methodology: Eighty patients of both genders were presented in this study. Patients detailed demographics age, sex and body mass index were recorded after taking informed written consent. Patients underwent for appendectomy wound irrigation were included. Patients were equally divided into two equal groups, I and II. Group I had 40 patients and received imipenem and group II irrigated with saline solution with 40 patients. Outcomes were surgical site infection, deep abscess formation was observed post-operatively. Results: The mean age of the patients in group I was 26.11±2.03 years with mean BMI 23.61±3.32 kg/m2 and in group II mean age was 25.14±3.12 years with mean BMI 22.14±4.88 kg/m2. In group I, 32 (80%) patients had inflamed appendix, perforated appendix was in 7 (17.5%) and gangrenous appendix in 1 (2.5%) while in group II inflamed appendix in 34 (85%), perforated appendix in 4 (10%) and gangrenous appendix 2 (5%). Surgical site infection in group I was 3 (7.5%) and abscess formation in 2 (5%) cases while in group II SSI in 6 (15%) and abscess formation in 3 (7.5%) cases. Conclusion: Imipenem irrigation after appendectomy reduces wound infection. Healthcare costs and patient suffering due to infection can be reduced. Keywords: Imipenem solution, Wound irrigation with saline, Appendectomy wound infection

Influence of Tobacco on Physical Fitness Recovery of College Students After Sports

2021 ◽  
Vol 7 (5) ◽  
pp. 3445-3451
Author(s):  
Chen Yake
Keyword(s):  
College Students ◽  
Physical Fitness ◽  
Aerobic Exercise ◽  
Negative Impact ◽  
Control Group ◽  
Exercise Time ◽  
Activity Intensity ◽  
Group I ◽  
The Difference ◽  
Experimental Group

Objectives: In this paper, the effects of tobacco on aerobic exercise ability and physical fitness recovery of college students were studied. Methods: University group sports intervention form: traditional characteristic project (basketball) + Taiji soft ball (R&D intervention project). Exercise time: 3 times/week; Activity duration: 30min; Activity intensity: the heart rate is controlled at 120-140 beats/min. All the college students in the experimental group are students who have never smoked, and the college students in the control group are students who have smoked for more than two years. The other conditions are the same. Results: The exercise time and endurance of experimental groups I and II were significantly lower than those of the control group, and the cardiopulmonary function was significantly lower than that of the control group. The indexes of experimental group II changed significantly compared with experimental group I, and the difference was statistically significant. Conclusion: Cigarette smoke can significantly reduce the aerobic exercise ability and anti fatigue ability. The longer the smoking time, the more serious the adverse effects. Therefore, tobacco smoke and nicotine will damage college students’ aerobic exercise ability and have a negative impact on the recovery of physical fitness after exercise.

scholarly journals Ultrastructural study of the effects of cyclosporine in the brainstem of Wistar rats submitted to the ethidium bromide demyelinating model

2008 ◽  
Vol 66 (2b) ◽  
pp. 378-384 ◽  
Author(s):  
Eduardo Fernandes Bondan ◽  
Maria Anete Lallo ◽  
Dominguita Lühers Graça
Keyword(s):  
Ethidium Bromide ◽  
Tissue Repair ◽  
Wistar Rats ◽  
Saline Solution ◽  
Immunosuppressive Treatment ◽  
Post Injection ◽  
Group I ◽  
Transmission Electron ◽  
Myelin Debris ◽  
Intracisternal Injection

The ethidium bromide-demyelinating model (EB) was used to study remyelination in the brainstem under the use of cyclosporine (CsA). Wistar rats were submitted to intracisternal injection of 0.1% EB or 0.9% saline solution, and others were taken as histologic controls (group I). Within those injected with EB, some have not received immunosuppressive treatment (II); some were treated by intraperitonial route with CsA (III.E - 10 mg/kg/day). Rats from group III.C were injected with saline solution and treated with CsA. The animals were perfused from 15 to 31 days post-injection collecting brainstem sections for light and transmission electron microscopy studies. After EB injection it was noted the presence of macrophages and non-degraded myelin debris, demyelinated axons, oligodendrocyte or Schwann cell remyelinated axons, groups of infiltrating pial cells, hypertrophic astrocytes and few lymphocytes. Tissue repair of EB-induced lesions in group III.E was similar to that of group II, but with the presence of a higher density of oligodendrocytes near remyelinating areas.

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