THYMUS VARIABILITY IN WHITE RATS EXPOSED TO FORMALDEHYDE

2019 ◽  
pp. 105-116
Author(s):  
V.N. Voloshin ◽  
I.S. Voloshina ◽  
I.Yu. Vash
Keyword(s):  
White Male ◽  
Principal Component ◽  
Middle Part ◽  
Procrustes Analysis ◽  
Male Rats ◽  
Canonical Variables ◽  
Generalized Procrustes Analysis ◽  
White Rats ◽  
Main Component ◽  
Formaldehyde Inhalation

The aim of the paper is to study thymus variability in white rats, which were exposed to formaldehyde, and to compare these data with the indicators in control animals. Materials and Methods. The trial enrolled 72 white male rats, initial body weight 40–50 g. The animals were divided into 2 groups (36 rats in each). The first group consisted of control rats. Animals of the second group were exposed to formaldehyde inhalation, 2.766 mg/m3. To characterize the variability of the organ size, centroids were determined. The superposition of landmark configurations was performed using the generalized Procrustes analysis method, MorphoJ 1.06d program. The principal component analysis and canonical analysis of the obtained data were carried out. Results. One-Way ANOVA revealed a high level of intergroup differences in Procrust distance (F=1.34; p<0.0001). The significant effect of the duration of formaldehyde exposure on centroid size was established. The Kruskal-Wallis criterion was 19.778 (p=0.0014). The analysis of the principal components indicated that each of the first 10 components stands for more than 1 % of Procrustes coordinate variance. In this case, the first 7 components compatibly explain 91.398 % of thymus variability. The proportion of the first main component to the total variance of the Procrustes coordinates is 40.236 %. PC1 (-) shows changes in the thymus shape, mostly affecting the tops of its lobes, the middle part of the right boundary and the entire left thymus boundary. The scattering ellipses of the thymus ordinates in rats exposed to formaldehyde, in the first two canonical variables are located higher than those in the control animals. Conclusion. Formaldehyde inhalation leads to thymus changes in white rat. The most significant differences with control data are determined along the second canonical variable. Keywords: thymus, form, rat, formaldehyde, geometric morphometry. Цель. Изучение изменчивости формы тимуса белых крыс, находившихся в условиях влияния формальдегида, и сравнение этих данных с показателями, полученными у контрольных животных. Материалы и методы. Работа выполнена на 72 белых крысах-самцах с начальной массой тела 40–50 г. Животные были разделены на 2 серии (по 36 крыс). Первую серию составляли контрольные крысы. Животные второй серии подвергались ингаляционному воздействию формальдегида (ФА) в концентрации 2,766 мг/м3. Для характеристики изменчивости размеров органов определяли размер их центроидов. Процедуру суперимпозиции конфигураций ландмарок выполняли методом генерализованного прокрустова анализа с использованием программы MorphoJ 1.06d. Проводили анализ главных компонент и канонический анализ полученных данных. Результаты. Однофакторный дисперсионный анализ выявил высокий уровень межгрупповых различий по показателю прокрустовых расстояний (F=1,34; р<0,0001). Установлено значительное влияние продолжительности нахождения животных в условиях воздействия ФА на размер центроида. Критерий Краскела–Уоллиса составил 19,778 (р=0,0014). Анализ главных компонент указывал на то, что каждая из первых 10 компонент объясняет более 1 % дисперсии прокрустовых координат. При этом первые 7 компонент совместно объясняют 91,398 % изменчивости формы тимуса. Вклад первой главной компоненты в общую дисперсию прокрустовых координат составляет 40,236 %. РС1 (–) показывает изменения формы тимуса, в большей степени затрагивающие верхушки его долей, среднюю часть правого контура и весь левый контур тимуса. Эллипсы рассеивания ординат тимусов, принадлежащих крысам, подвергавшимся влиянию ФА, в пространстве первых двух канонических переменных расположены выше по отношению к таковым контрольных животных. Заключение. Ингаляционное воздействие формальдегида приводит к изменению формы тимуса белых крыс. Наибольшие различия с контрольными данными определяются вдоль второй канонической переменной. Ключевые слова: тимус, форма, крыса, формальдегид, геометрическая морфометрия.

scholarly journals Determination of the cumulative and skin-resorptive action of the Zoodizin disinfectant

2020 ◽  
Vol 22 (97) ◽  
pp. 26-30
Author(s):  
O. L. Nechyporenko ◽  
A. V. Berezovskyy ◽  
T. І. Fotina ◽  
R. V. Petrov
Keyword(s):  
Skin Irritation ◽  
White Male ◽  
Cumulative Effect ◽  
Female Rats ◽  
Male Rats ◽  
White Female ◽  
Test Substance ◽  
High Concentration ◽  
White Rats ◽  
Single Effect

The rational organization and implementation of effective disinfection activities plays an important role in the complex of measures for the prevention of infections. The development and introduction of new disinfectants into production is an urgent issue of modern poultry farming. When developing a disinfectant, it is important to determine the cumulative effect of the drug. The purpose of the study was to determine the cumulative and skin-resorptive action of the disinfectant “Zoоdizin”. For the toxicological study of the drug used healthy white male rats and white female rats weighing 200 ± 10 g 1.5 years of age. To study the toxicity of the drug “Zoоdizin” when applied to the skin used the method of immersion of the tails of rats in a test tube with the test substance. The tail was injected 2/3 into a regular tube with a 5 % solution of the drug “Zoоdizin”. The tube was closed with a cork ring whose diameter was slightly larger than the tail diameter. For 15 days, the tubes were placed daily in a water bath at 28–30 °C for 2 hours. Control animals tails were immersed in distilled water. To establish the local action of the drug “Zoodizin” on the mucous membranes of the study drug was introduced into the conjunctival sac of the right eye of the rabbit at a dose of 50 mg, and in the left eye was buried saline in a volume of 0,05 cm3. When studying the cumulative effect of Zoоdizin, no significant changes in the biochemical parameters in the serum of rats were observed. In the study of possible irritant or damaging effect on the skin and the development of contact non-allergic dermatitis found that a single application of disinfectant “Zoоdizin” on the unaffected skin of the back of white rats in the maximum significant recommended concentration of working solutions (2 %) did not cause signs. The single effect of the drug on the intact areas of the skin did not cause skin irritation, but it can be stated that prolonged daily epicutaneous exposure of high concentration (5 %) of the solution of the drug “Zoоdizin”, which is 2.5 times higher than the maximum recommended concentration, caused a general resorption. When assessing the cumulative properties, it was taken into account that the total dose administered to rats was Zodizin 42000 mg/kg body weight and did not result in animal death. It did not allow to calculate the cumulative coefficients for the “lethal effect”. A single effect of the product on the intact areas of the skin did not cause skin irritation, but it can be stated that prolonged daily epicutaneous exposure of a high concentration (5 %) of the Zodizin solution, which is 2.5 times the maximum recommended concentration, caused a general resorption. In the future, it is planned to study the virulidal properties of the biocide “Zoоdizin”.

Toward an Affective Design of Products

2012 ◽  
Author(s):  
Weihua Lu ◽  
Jean-François Petiot
Keyword(s):  
3D Model ◽  
Emotional Responses ◽  
Principal Component ◽  
Procrustes Analysis ◽  
Product Development Process ◽  
Parameter Method ◽  
Shape Factors ◽  
Critical Elements ◽  
Generalized Procrustes Analysis ◽  
Geometrical Features

The measurement and understanding of user emotions elicited by product appearance are critical elements of the product development process and have been interesting design challenges for many years. This paper proposes an original emotion measurement method, called Auditory Parameter Method. It is a non-verbal technique, which uses sounds and association tests for evaluating a set of products (given by their pictures). It provides an assessment of these products according to a series of emotional dimensions. We present a methodological framework to build the links between user’s emotional responses and geometrical features of product, by using a glasses frame 3D model as application case. Analysis of Variance techniques are employed to examine how various shape factors influence users’ emotional responses to 3D model. To demonstrate the effectiveness of our protocol, we compare the proposed method with the conventional Semantic Differential using Principal Component Analysis and Generalized Procrustes Analysis. The new protocol demonstrates interesting qualities to collect the intuitive emotions of user.

scholarly journals Morphological features of the wall of common bile duct under the conditions of experimental opioid exposure

2020 ◽  
Vol 26 (2) ◽  
pp. 26-31
Author(s):  
L.R. Mateshuk-Vatseba ◽  
I.I. Hirniak ◽  
U.Y. Pidvalna
Keyword(s):  
Bile Duct ◽  
Common Bile Duct ◽  
Bile Ducts ◽  
White Male ◽  
Acute Cholangitis ◽  
Medical Science ◽  
Male Rats ◽  
Pathological Changes ◽  
White Rats ◽  
The Common

The morphological condition of the bile ducts remains one of the most important problems of modern medical science. In order to obtain an analgesic effect in patients with acute cholangitis, opioids are often used. However, information on the effectiveness of opioids in the treatment of pathological conditions of the bile ducts is contradictory. The rapidly progressive destruction of the intrahepatic bile ducts associated with the use of narcotic agents has been described. Further study of the effect of opioids on the structural organization of the common bile duct is relevant. In order to establish the morphological state of the common bile duct under conditions of long-term opioid exposure, a study was performed on 24 sexually mature white male rats, aged 3.5-5.0 months and weighing 180-200 g, which were injected intramuscularly with Nalbuphine for 6 weeks. The study material is represented by histological specimens of the common bile duct of white rats. The “Aver Media” computer system was used to photograph microspecimens. The “ImageJ” computer program was used to measure the diameter of the lumen and the wall thickness of the common bile duct. After 2 weeks of Nalbuphine administration to white rats, plethora of wall microvessels and a significant increase in the longitudinal diameter of the lumen of the common bile duct were observed. After 4 weeks of the experiment, the common bile duct was dilated, the transverse and longitudinal diameters of its lumen almost doubled, pathological changes in its wall had all the signs of inflammation. In the later stages of the experiment (introduction of Nalbuphine for 6 weeks), the pathological changes increased and manifested by destructuring the wall of the common bile duct, disorganization of cholangiocytes, thinning of the cell layer due to detachment of cholangiocytes, polymorphism of their nuclei, destruction of intercellular junctions, stratification of its own plate, vacuolar dystrophy of the muscular membrane “varicose” expansion of venules, significant smooth muscle hyperplasia of arterioles, the presence of perivascular lymphocytic infiltrates in the duct wall.

scholarly journals Match of the Bimaxillary Basal Bone Arches and Its Variations among Individuals

Scanning ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Wenqian Chen ◽  
Hao Zeng ◽  
Luna Sun ◽  
Qiuping Xu ◽  
Zhenxue Chen ◽  
...  
Keyword(s):  
Principal Component ◽  
Procrustes Analysis ◽  
Cone Beam ◽  
Occlusal Plane ◽  
Bone Morphology ◽  
Second Molar ◽  
Generalized Procrustes Analysis ◽  
Basal Bone ◽  
Retromolar Region ◽  
Inner Cortex

Introduction. This study is aimed at illustrating the bimaxillary basal bone contours, to clarify the match of the basal bone arches of the upper and lower, especially the posterior segments, including the second molar and retromolar region. Methods. Based on 100 cone-beam computed tomography (CBCT) images (50 males and 50 females), we obtained 100 pairs of basal bone arches, which were the horizontal inner cortex contours passing the furcation of the first molar paralleled to the lower occlusal plane. The Generalized Procrustes Analysis (GPA) was applied to depict average contours and calculate the ratio and difference width of both upper and lower dental arches in different positions. Variations of the basal bone morphology among individuals were revealed using Principal Component Analysis (PCA). Results. The width discrepancy occurred at 7-7 segment (male: upper 65.62 mm and lower 68.81 mm and female: upper 62.98 mm and lower 68.38 mm) and the retromolar region (male: upper 64.67 mm and lower 71.96 mm and female: upper 62.34 mm and lower 71.44 mm). The ratio ( p = 0.006 ) and difference value ( p = 0.009 ) of 7-7 segment and the ratio of retromolar region ( p = 0.044 ) differed in genders. Setting 2 mm overjet, the upper basal bone arch was wider than the lower by approximate 2 mm on both sides, except the second molar and retromolar region. According to PCA, the variation of basal bone arches appeared mainly at terminal segments. Conclusions. For both male and female, the bimaxillary basal bone matched except terminal segments. Mismatch of female bimaxillary posterior basal bone was more pronounced than male. The basal bone arches of male were wider and longer than that of female.

scholarly journals Identifying of Homoneura (Diptera: Lauxaniidae) females by means of geometric morphometrics

2017 ◽  
Vol 66 (1) ◽  
pp. 75-86
Author(s):  
Marek Semelbauer
Keyword(s):  
Geometric Morphometrics ◽  
Principal Component ◽  
Wing Shape ◽  
Procrustes Analysis ◽  
Distribution Data ◽  
Multivariate Methods ◽  
Linear Discriminant ◽  
European Species ◽  
Generalized Procrustes Analysis ◽  
Males And Females

Abstract The females of the European species Homoneura consobrina, H. patelliformis and H. thalhammeri are not easy to discern. A possible method of identifying females is to apply geometric morphometrics to the wing shape, when we expect females of certain species to have wing shape more similar to conspecific males, than to other species. For this purpose, 94 specimens of the three species were collected mainly by means of Malaise trap in western and central Slovakia and Montenegro. The combination of morphological and distribution data allowed for the females to be divided into three groups. In next step, wings of both males and females were digitized, aligned by Generalized Procrustes Analysis and analyzed via multivariate methods (principal component analysis, multivariate analysis of variance, linear discriminant analysis). Results of the analysis clearly suggest that females with large and convex 8th sternite belong to H. patelliformis, while females with reduced 8th sternite belong to either H. thalhammeri or H. consobrina.

scholarly journals Features of angioarchitectonics and structure of the aortic wall of white rats in the early stages of experimental diabetes mellitus

Morphologia ◽  
2021 ◽  
Vol 15 (3) ◽  
pp. 167-174
Author(s):  
M.N. Tsytovskyi ◽  
M.V. Logash ◽  
I.I. Savka ◽  
G.M. Dmytriv
Keyword(s):  
Diabetes Mellitus ◽  
Aortic Wall ◽  
Experimental Diabetes ◽  
White Male ◽  
Male Rats ◽  
White Rats ◽  
Significant Difference ◽  
Streptozotocin Induced Diabetes ◽  
Atherosclerotic Cardiovascular Diseases ◽  
Imagej Software

Background. Atherosclerotic cardiovascular diseases, as well as coronary heart disease, cerebrovascular disease, and peripheral artery disease (probably caused by atherosclerosis), are the leading cause of disability and mortality in people with diabetes. Objective. The purpose of our study was to determine the histostructural features and morphometric analysis of the components of the aortic wall and its hemomicrocirculatory bed after 2 and 4 weeks of streptozotocin-induced diabetes mellitus. Methods. The samples for the histology were the sections of the wall of the ascending part, the aortic arch, and the descending part of the aorta of 26 mature white male rats weighing 100 - 160 g. For morphometric examination, a series of images of the aortic wall was taken using a Meiji MT4300 LED microscope with an x40 objective, x10 eyepiece. Results and conclusion. The measurements were carried out using the ImageJ software. The development of micro- and macroangiopathies in experimental animals with 8-week streptozotocin-induced diabetes mellitus was histologically proved. Statistical analysis revealed a significant difference of all morphometric parameters of both - the components of the aortic wall and the vessels of its hemomicrocirculatory bed after 4 weeks of experimental diabetes in comparison with the norm, control, and the 2-nd week of the experiment. An explicit dependency of the severity of destructive changes in the wall of the aorta and links of its hemomicrocirculatory bed of vessels on the duration of the experiment was determined.

scholarly journals DYNAMICS OF MORPHOMETRIC INDICATORS OF GINGIVAL MUCOUS MEMBRANE COMPONENTS OF RATS IN THE LATE TERMS OF CHRONIC OPIOID INFLUENCE

2020 ◽  
Author(s):  
Fik V. B.
Keyword(s):  
Connective Tissue ◽  
Opioid Analgesic ◽  
White Male ◽  
Experimental Studies ◽  
Morphometric Parameters ◽  
Reproductive Age ◽  
Male Rats ◽  
Periodontal Tissues ◽  
White Rats ◽  
Gingival Mucosa

The aim of this study was to examine the morphometric parameters of the thickness of the epithelial plate of the gingival mucosa, the height of the connective tissue papillae and the diameter of the lumen of hemomicrovascular white rats in the dynamics after eight, ten and twelve weeks of chronic opioid exposure. Experimental studies were performed on white male rats of reproductive age. For twelve weeks, rats were injected intramuscularly with the opioid analgesic nalbuphine at increasing average therapeutic doses of 0.212 to 0.3 mg/kg body weight. Fragments of rat jaws were used for histological and morphometric studies. Based on the analysis of the obtained morphometric parameters of the studied components of the gums, it was found that in the late stages of chronic opioid exposure there was a significant decrease in epithelial thickness and connective tissue papillae and a significant increase in the lumen diameter of hemomicrocirculatory progression of inflammatory-dystrophic changes in periodontal tissues.

scholarly journals Anti-inflammatory Activity of Ethanol Extract of Lotus (Nelumbo nucifera G.) Seed Against White Male Rats Using Paw Edema Method

2021 ◽  
Vol 11 (4) ◽  
pp. 1-4
Author(s):  
Khairani Fitri ◽  
Tetty Noverita Khairani ◽  
Kristin Tiurma Sianturi ◽  
Leny Leny ◽  
Ihsanul Hafiz
Keyword(s):  
White Male ◽  
Ethanol Extract ◽  
Nelumbo Nucifera ◽  
Inflammatory Activity ◽  
Male Rats ◽  
Control Group ◽  
Paw Edema ◽  
White Rats ◽  
Activity Test ◽  
Anti Inflammatory

The purpose of this study was to determine the anti-inflammatory activity test of ethanol extract of lotus seeds in rats induced by carrageenan. The research method used was experimental. The object used in this study was male white rats. Observations were made for 6 hours and then the data were analyzed using the one way analysis of variance (ANOVA) test. The anti-inflammatory activity test was carried out on the test animals which were divided into 5 groups, 3 each with the suspension test group with a dose of 200, 300, 400 mg/kg bw, the negative control group was the CMC Na 1% suspension and the positive control was diclofenac Na 2, 25 mg/kg bw. The results showed that the ethanol extract of the seeds of lotus (Nelumbo nucifera G) was proven to have an anti-inflammatory effect on carrageenan-induced male white rats at doses of 200, 300 and 400 mg/kg BW with the percentage value of inflammation inhibition at the 6th hour was 65.79, 74.65 and 80.77%, with the most effective dose in reducing anti-inflammatory drugs being 400 mg/kg bw. The ethanol extract of the seeds of lotus (Nelumbo nucifera) has anti-inflammatory activity. Keywords: anti-inflammatory activity, Nelumbo nucifera, paw edema

scholarly journals ALTERATION OF BRAIN TISSUE, LIVER, AND KIDNEY IN THE POST-CONTACT PERIOD IN WHITE RATS EXPOSED TO VIBRATION

2019 ◽  
Vol 98 (10) ◽  
pp. 1108-1112
Author(s):  
Eugeny A. Titov ◽  
V. A. Pankov ◽  
A. V. Lizarev ◽  
M. V. Kuleshova
Keyword(s):  
Brain Tissue ◽  
Liver Tissue ◽  
Morphological Changes ◽  
White Male ◽  
Experimental Studies ◽  
Kidney Tissue ◽  
Male Rats ◽  
Ultrastructural Changes ◽  
Contact Period ◽  
White Rats

Introduction. Experimental studies in animals have shown ultrastructural changes in hepatic sinusoidal endothelial cells, tissue hypoxia of the kidneys, changes in the activity of oxidative processes and antioxidant enzymes, the formation of bioenergetic hypoxia, cell response in the form of infiltration of both lymphoid and macrophage cells to develop due to exposure to vibration. However, there is almost no data about the status of animals’ organs in the post-contact period. Material and methods. The study was carried out in white male rats weighing 220-240 g, were exposed to 40 Hz vibration for 60 days 5 times a week for 4 hours a day. Histological and morphometric analysis was used to assess the sensorimotor cortex tissue and hepatorenal system. Results. A decrease in the total number of brain neurons, astraglial cells in rats in 30, 60 and 120 days of the post-exposure period was found. There was hyperemia in the portal and Central veins, an increase in the number of Kupffer cells in the liver tissue at the 30th, 60th, 120th day after the exposure. Decrease in the area of the Shumlyansky-Bowman capsule was recorded in the experimental rats’ kidney tissue 30 days after the end of vibration exposure; though there were no differences in the number of renal bodies in the tissue of white rats of the experimental and control groups at 60th and 120th day after the end of exposure to vibration. Conclusion. Morphological changes in the tissues of white rats exposed to prolonged vibration presented in the form of a decrease in the total number of neurons and astroglia cells in the brain tissue, a pronounced macrophage response in the liver tissue have been preserved in the post-contact period following the exposure to vibration.

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