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BMC Zoology ◽  
2022 ◽  
Vol 7 (1) ◽  
Author(s):  
Ivana Kerly S. Viana ◽  
Gicelle M. F. S. ◽  
Juliana C. D. Pantoja ◽  
Renata S. Oliveira ◽  
Yanne A. Mendes ◽  
...  

Abstract Background Hypostominae is a subfamily of the family Loricariidae that has a great diversity of species. Accordingly, testicular studies in fish can contribute to the phylogeny and taxonomy of species and to the comparison of reproductive aspects between species. Thus, this work aimed to characterize the testicular morphology and spermatogenesis of the Hypostominae species Baryancistrus xanthellus, Peckoltia oligospila and Hypancistrus zebra. Results B. xanthellus, P. oligospila and H. zebra had an anastomosed tubular type of testis. The germinal epithelium was continuous with unrestricted spermatogonia, and the proliferative, meiotic and spermiogenic phases were defined in all species. In the spermiogenic phase, spermatids were classified as initial, intermediate and final. Only in B. xanthellus in the final phase was there nuclear rotation. The sperm for the three species had a head with an oval shape and a single flagellum composed of the short midpiece, principal piece and end piece. B. xanthellus and P. oligospila showed a cylindrical flagellum and H. zebra showed projections that produced a flattened appearance. Conclusions On the basis testicular structure and ultrastructural characteristics of the germ cells, there was a greater relationship between B. xanthelus and P. oligospila, while H. zebra had particular characteristics. These aspects show that despite belonging to the same subfamily, the species have distinct biological characteristics.


2021 ◽  
Vol 9 (C) ◽  
pp. 304-307
Author(s):  
Fiedyawati Kusuma ◽  
Jemie Rudyan

BACKGROUND: Acrochordons are pedunculated papules or nodules with a soft consistency and smooth contour, sometimes apparently growths often hang on thin stalk, with the most acrochordons size was 2–5 mm. Occasionally, due to frictions of the pedicle, acrochordon can become inflamed, tender, and even gangrenous. CASE PRESENTATION: We report a case series of three giant acrochordons, first case, 19-year-old female come to my OPD clinic with a big mass on her left vagina, with pain and hot while being touched, and fever. On examination big nodule on the right labia mayor was found, with diameter 20 × 20 cm, short stalk, firm, warmed, and pain sensation while touched, with several excoriated skin surface. Second case, 23-year-old female presented in my OPD with a mass in her left vagina, associated with pain and several bleeding spots while being touched, with diameter of 5 × 5 cm. Third case, 31-year-old female consulted to OPD clinic with a year of history having a mass on her right buttock, which gradually increases in size and causing a light pain. On examination, short pedunculated nodule was found at the right buttock, diameter 10 × 6 cm, oval shape, firm, and several excoriated plaques. All cases were diagnosed as giant acrochordons and were performed excision. The previous studies state that the larger lesions of acrochordons in the groin or upper thighs maybe associated with diabetes mellitus and obese individuals. Due to the twisting or strangulated of the pedicle, all three cases of giant acrochordons become inflamed, tender, irritated, infarction, and even gangrenous. In general, it was advised to have the acrochordons removed, particularly in the skin fold of axillae, groin, or vagina, since they will gradually develop in size. CONCLUSION: Giant acrochordons usually relate to the growth hormone like activity. Hence, they may associate with endocrine disorder. It may occasionally become inflamed, tender, and even gangrenous due to frictions. General principle is to have the acrochordons removed, particularly in skin fold area.


2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Mohammed Mashyakhy ◽  
Ahmed Mostafa ◽  
Amani Abeery ◽  
Zainab Sairafi ◽  
Nazeeha Hakami ◽  
...  

Introduction. Accurate and precise knowledge about the position, size, and shape of the mental foramen (MF) are critical in avoiding procedural complications. The MF’s anatomical features vary among different ethnic groups, and various radiographic techniques have been used to determine these variations. Aims. To evaluate the MF’s shape, vertical and horizontal positions, and distance from the border of the mandible. To evaluate the differences among genders as they pertain to the right and left sides of the mandible and research the bilateral symmetry regarding the same variables. Materials and Methods. Cone beam computer tomography (CBCT) scans of 155 Saudi patients (69 males and 86 females) who visited the college of dentistry’s clinics were obtained from the college database for this retrospective study. All the scans were analyzed by 3 calibrated examiners. The data collected was analyzed statistically, and results were obtained. Results. The MF was located under the mandibular second premolar in 56.9% of cases, whereas in 26.9% of cases, it was located between the first and second mandibular premolar. The most prevalent position was below the level of the apices of the mandibular premolar teeth (87.2%). The round shape was most frequent (44.9%) compared to the H-oval (34.7%) and V-oval (20.4%). The V-oval shape was more frequent in males, while the H-oval shape was more frequent in females. The average distance from the center of the MF to the mandibular border was 14.03 ± 1.58   mm , with males exhibiting a greater distance than females. Overall, there were no significant differences between the bilateral symmetry and the right and left sides for all parameters. Conclusion. The most common position of the MF was under the root apex of the mandibular second premolar, with an average distance of about 14 mm from the border of the mandible. The position and shape of the MF were the same bilaterally in the majority of individuals.


2021 ◽  
Vol 9 (4) ◽  
pp. 8109-8115
Author(s):  
Ndiaye M R ◽  
◽  
Mar N B ◽  
Yacouba Garba K ◽  
Ndoye J M N ◽  
...  

Aim: The aim of our study was to perform a morphometric analysis of the mental foramen in senegalese context. Material and method: The study was performed on thirty-nine dry mandibles of adult humans. On these mandibles, the number of mental foramen present and their shape were noted on inspection. The situation of the foramen in relation to the lower teeth was studied according to a methodology already described. The following measurements were made: the distance between the foramen and the other landmarks of the mandible (symphysis, basilar border, posterior border), vertical and horizontal diameters. Results: The number of mental foramina were 39 on the right and 40 on the left: one mandible presented a double foramen on the left. The oval shape was predominant. The most frequent situation was below the second premolar on both sides. The mean distance between the foramen and the mandibular symphysis was 25mm on both sides. The distance between the foramen and the basilar border of the mandible was on average 13mm on the right and 14mm on the left. The distance between the foramen and the posterior border of the mandible was on average 72mm on the right and 73mm on the left. The average vertical diameter was 33mm on the right and 32mm on the left, and the average horizontal diameter was 4mm on both sides. Conclusion: Mental foramen is a constant anatomical structure, found on all the mandibles studied. The results can be superimposed on those described in the majority of studies carried out on the mental foramen. Key words: Mental Foramen, Mandible Anatomy, Morphometry.


2021 ◽  
Vol 5 (3) ◽  
pp. 353-362
Author(s):  
Jordan Zagoto ◽  
M. Nawawiy Loebis1

North Nias’ traditional house is the only oval-shaped traditional house in the whole world. The oval floor plan that is not commonly found in other traditional buildings is analyzed based on anthropological (non-physical) and functional (physical) backgrounds of North Nias and other community groups in various regions whose traditional house forms resemble, which aims to compare and find similarities between them. The method used in this research is comparative, which is a type of descriptive research that aims to find a fundamental answer about cause and effect by analyzing the factors that cause a particular phenomenon. It was found that the process of forming an oval floor plan in a traditional house in North Nias was caused by several factors, including the functional aspect of North Nias community requiring a large oval-shaped space to gather among villagers, and also as a war strategy wherein an oval room, it is easier to observe around the building. From the anthropological aspect, the use of oval shape is related to the belief of the North Nias community. The benefit of this research is to add insight and public references about the use of architectural forms that are not commonly applied.


Author(s):  
Dong Han Shin ◽  
You Seon Song ◽  
Yunjung Choi ◽  
Wan-Hee Yoo ◽  
Florian Kummel ◽  
...  

Objectives: To accurately differentiate clumpy artifacts and tophi with foot and ankle DECT. Methods and materials: In session 1, 108 clumpy artifacts from 35 patients and 130 tophi images from 25 patients were analyzed. Reviewers classified green pixelation according to anatomic location, shape (linear, stippled, angular, oval), and height and width ratio. In session 2, green pixelation confined to the tendon was evaluated (shape, height and width ratio, occupied area in the tendon, accompanied peritendinous green pixelation). Results: In session 1, while tophi were noted at various locations, almost all clumpy artifacts were located at the tendon (99%, p < 0.0001). Most clumpy artifacts were linear, stippled, and wide, while most tophi were angular and oval (p < 0.05). In session 2, the shape of green pixelation from clumpy artefact and tophi was significantly different (p < 0.0001) and most clumpy artifacts occupied less than 50% of the tendon (p = 0.02), and most tophi were accompanied by peritendinous green pixelation (p < 0.0001). Univariant logistic regression showed that tophi were significantly correlated with peritendinous deposits, angular and oval shape, and more than 50% of the tendon (p < 0.05). Conclusion: Clumpy artifacts can be differentiated from tophi in DECT. Clumpy artifacts typically are located in the tendon with a linear or stippled shape, wide, and less than 50% of a tendon’s cross-section. Tophi, on the other hand, typically are oval, larger than 50% of the tendon’s cross-section, and associated with adjacent peritendinous green pixelation. Advances in knowledge: Clumpy artifacts can be differentiated from tophi in image findings by their location and shape.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Thomas Gerhard Wolf ◽  
Andrea Lisa Anderegg ◽  
David Haberthür ◽  
Oleksiy-Zakhar Khoma ◽  
Sven Schumann ◽  
...  

AbstractThe aim of this study was to investigate the root canal system morphology by means of a root canal configuration (RCC) classification described with a four-digit system, the physiological foramen geometry and accessory canal frequency and morphology, of 101 mandibular canines (MaCa) of a Swiss-German population by means of micro-computed tomography. Micro-CT examination of the MaCa was performed and the obtained images analyzed with a 3D imaging software. In single-rooted MaCas, the most frequently observed RCCs were 1-1-1/1 (74.5%) and 1-1-1/2 (14.3%). Seven other RCCs were less frequently observed with a frequency from 4.1 to 1.0%. One physiological foramen was observed in 80.6% of the MaCas, two in 16.3%, three in 1.0% and four in 2.0%. Accessory and connecting canals were apparent only in the middle and apical root thirds. Two-rooted MaCas occurred less frequently (n = 3). When one physiological foramen was present, the mean size of the narrow and wide diameters were 0.28 mm (± 0.07) and 0.40 mm (± 0.11), while the distance between physiological and anatomical foramen was 0.45 mm (± 0.17). MaCas are predominantly single-rooted teeth with a 1-1-1/1 or 1-1-1/2 RCC. Most MaCas had one physiological foramen with an oval shape.


BMC Biology ◽  
2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Ekaterina Stansfield ◽  
Barbara Fischer ◽  
Nicole D. S. Grunstra ◽  
Maria Villa Pouca ◽  
Philipp Mitteroecker

Abstract Background The human foetus typically needs to rotate when passing through the tight birth canal because of the complex shape of the pelvis. In most women, the upper part, or inlet, of the birth canal has a round or mediolaterally oval shape, which is considered ideal for parturition, but it is unknown why the lower part of the birth canal has a pronounced anteroposteriorly oval shape. Results Here, we show that the shape of the lower birth canal affects the ability of the pelvic floor to resist the pressure exerted by the abdominal organs and the foetus. Based on a series of finite element analyses, we found that the highest deformation, stress, and strain occur in pelvic floors with a circular or mediolaterally oval shape, whereas an anteroposterior elongation increases pelvic floor stability. Conclusions This suggests that the anteroposterior oval outlet shape is an evolutionary adaptation for pelvic floor support. For the pelvic inlet, by contrast, it has long been assumed that the mediolateral dimension is constrained by the efficiency of upright locomotion. But we argue that the mediolateral elongation has evolved because of the limits on the anteroposterior diameter imposed by upright posture. We show that an anteroposteriorly deeper inlet would require greater pelvic tilt and lumbar lordosis, which compromises spine health and the stability of upright posture. These different requirements of the pelvic inlet and outlet likely have led to the complex shape of the pelvic canal and to the evolution of rotational birth characteristic of humans.


2021 ◽  
Vol 7 (10) ◽  
pp. 1787-1805
Author(s):  
Arun Kumar ◽  
Ritu Raj

This paper aims to study the wind flow characteristics and to analyze the wind pressure distribution on the surfaces around an irregular octagonal plan shape building model. There is a central open space in plan to provide more surface area around the building for natural ventilation. Plan area of the building is 300 m2(excluding the open space) and height is 50 m. Steady state flow of wind with 5% turbulence (moderate turbulence) under atmospheric boundary layer has been taken in the study. Numerical simulation with standard k-e model using ANSYS (CFX) software has been used for the purpose. Flow characteristics has been studied in terms of flow separation, reattachment of flow, creation of wakes and vortices. The surface pressure generated around the model has been studied in terms of coefficient of pressure. The model is symmetrical about both the axes in plan. Hence, study for different wind angle of attacks from 0° to 90° @ 30° interval has been conducted. The flow characteristics and unusual or critical coefficient of pressure on surfaces of the model observed have been discussed. Doi: 10.28991/cej-2021-03091760 Full Text: PDF


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