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Author(s):  
Selda Aksoy ◽  
Bulent Yalcin

Abstract Background Atlantoaxial instability is an important disorder that causes serious symptoms such as difficulties in walking, limited neck mobility, sensory deficits, etc. Atlantal lateral mass screw fixation is a surgical technique that has gained important recognition and popularity. Because accurate drilling area for screw placement is of utmost importance for a successful surgery, we aimed to investigate morphometry of especially the posterior part of C1. Methods One hundred and fifty-eight human adult C1 dried vertebrae were obtained. Measurements were performed directly on dry atlas vertebrae, and all parameters were measured by using a digital caliper accurate to 0.01 mm for linear measurements. Results The mean distance between the tip of the posterior arch and the medial inner edge of the groove was found to be 10.59 ± 2.26 and 10.49 ± 2.20 mm on the right and left, respectively. The mean distance between the tip of the posterior arch and the anterolateral outer edge of the groove was 21.27 ± 2.28 mm (right: 20.96 ± 2.22 mm; left: 21.32 ± 2.27 mm). The mean height of the screw entry zone on the right and left sides, respectively, were 3.86 ± 0.81 and 3.84 ± 0.77 mm. The mean width of the screw entry zone on both sides was 13.15 ± 1.17 and 13.25 ± 1.3 mm. Conclusion Our result provided the literature with a detailed database for the morphometry of C1, especially in relation to the vertebral artery groove. We believe that the data in the present study can help surgeons to adopt a more accurate approach in terms of accurate lateral mass screw placement in atlantoaxial instability.


2021 ◽  
Vol 17 (1) ◽  
pp. 113-126
Author(s):  
C. Y. Chong ◽  
T. H. W. Lee ◽  
J. C. Juan ◽  
Mohd Rafie Johan ◽  
C. F. Loke ◽  
...  

A simple and scalable liquid-based method was developed to produce a nanocomposite photocatalyst which was comprised of Fe3O4 nanoparticles (4-5 nm) decorated indium hydroxide nanorods (mean width 33 nm and average aspect ratio 2-3). The nanocomposite was produced at 25 ℃ in water via a hydroxide-induced co-precipitation ensued by a cathodic reduction during which the non-magnetic Fe(OH)3 intermediate was reduced to magnetic Fe3O4 at 20 V within 1 h. The incorporation of Fe3O4 nanoparticles served to bestow magnetic recoverability to the photocatalyst and helped enhance visible light absorption simultaneously. Interestingly, the addition of Fe3+ led to the formation of In(OH)3 nanorods rather than the commonly observed nanocubes. In comparison to the In(OH)3 system having a band gap of 4.60 eV), the band gap of the Fe3O4/In(OH)3 nanocomposite produced was determined to be 2.85 eV using the Tauc’s plot method. The effective reduction in band gap is expected to allow better absorption of visible light which in turns should help boost its photocatalytic performance. The Fe3O4/In(OH)3 nanocomposite was structurally characterized using a combination of PXRD, FESEM, EDS, and TEM and its paramagnetic property was proven with a positive mass susceptibility measured to be 1.30´10−5 cm3.g−1. Under visible light, a photocatalytic degradation efficiency of 83% was recorded within 1 hr for the nanocomposite using methylene blue as a dye. The photocatalytically-active Fe3O4/In(OH)3 should have good potential in visible-light driven waste water degradation once further optimized. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 


2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Khalil Khamassi ◽  
Elyes Babay ◽  
Mustapha Rouissi ◽  
Abir Dakhlaoui ◽  
Rayda Ben Ayed ◽  
...  

Faba bean (Vicia faba L.) is a legume crop cultivated for its nutritious seeds that are an important worldwide source of human food and feed. Seeds characterization is a prerequisite step for faba bean quality improvement. The morphophysical characterization of the seeds of twenty-four local faba bean accessions following the UPOV descriptors and the AOAC International standards was carried out and assessed with an approach based on Euclidean statistical model. “205 Bulk” was the unique accession harboring white hilum color seed which is linked to low convicine grain content. Irregular seed shape was the most observed character among the studied accessions except “Badii” displaying an elliptical seed shape; therefore, seed shape did not allow discrimination within our Tunisian germplasm. Interestingly, the physical characters of the seeds showed significant diversity between the accessions for all the measured parameters. A highly significant variability was observed for axial, length, and width dimensions of seeds, with “Memdouh” being the longest and largest seed accession, whereas “01-02” was the shortest and narrowest. Classification of the studied faba bean germplasm accessions based on morphophysical characters using clustering by Euclidean distance revealed three different groups. Moreover, multivariate PCA analysis further classified the faba bean accessions into four main clusters. Correlation study performed by using Spearman’s test established positive correlations within physical parameters of seeds such as between mean length and mean width of seeds. Therefore, using morphophysical parameters screening, valuable phenotypes have been selected for deeper physiological characterization and further breeding programs.


2021 ◽  
Vol 108 (Supplement_8) ◽  
Author(s):  
Julio Gómez-Menchero ◽  
Antonio Gila Bohorquez ◽  
Pablo de la Herranz ◽  
Jose Luis Guerrero Ramirez

Abstract Aim LIRA technique (Laparoscopic Intracorporeal Rectus Aponeuroplasty) was described in 2018 in order to reduce the tension in the midline as an alternative to defect closure (CD) in Laparoscopic Ventral Hernia Repair. We present our results in LIRA series in patients over 1-year follow-up. Material and Methods A prospective controlled study was conducted from January 2015 to December 2020 to evaluate an elective new procedure (LIRA) performed on patients with midline ventral hernias w2 (EHS Classification). Data analyzed included patient demographics, operative parameters and complications. A Tomography was performed preoperatively and postoperatively (1 month and 1 year) to evaluate recurrence, distance between rectus and seroma Results 49 patients were included. Mean Age was 58± 10.59 years old and BMI 33.11± 6.61 kg/m2. Mean width of the defect was 6.19± 1.49 cm. Average VAS (24 h) was 5.09 ± 5, 0.38(1 month) and 0 (1 year). Mean preoperative distance between rectus was 5.55± 1.61 cm; postoperative was 2.15 ± 0.79 cm (1 month) and 2.20±0.68 cm (1 year). Radiological seroma at first month was detected in 40%. Seroma after 1 year was 4,08% Mean follow-up was 24 months. Bulging was detected only in 1 case (2.04%) of our series after 1 year follow up. No recurrence is data. Conclusions LIRA technique could be considered as an alternative to CD for w2 defects with a low rate of complication, and could be related to a low rate of postoperative pain with no recurrence and a low rate of bulging compared to CD, being a safe, feasible and reproducible technique.


2021 ◽  
Vol 15 (10) ◽  
pp. 3193-3195
Author(s):  
Muhammad Usman Khattak ◽  
Irshad Ahmed ◽  
Kapil Kumar ◽  
Muhammad Iftikhar Ahsen ◽  
Khurram Ata Ullah ◽  
...  

Objective: To find out the correlation of gingival biotype with width of keratinized gingiva in maxillary anterior teeth in patients at tertiary care dental hospital presenting for routine periodontal care. Materials And Methods: In this crossectional study, a total of 87 patients were observed in department of Periodontology, Fatima Memorial Hospital College of Medicine and Dentistry Lahore. The gingival biotype (gingival thickness) were determined by using the transparency of the periodontal probe through gingival sulcus. The width of the keratinized gingiva was measured by measuring the distance between the most coronal point of the gingival margin and the mucogingival junction measured at the midpoint of the vestibular face of the teeth using a Michigan O periodontal probe with William’s markings. Results: In this study mean age was 38 years with SD ± 10.88. Forty six percent patients were male and 54% patients were female. Mean width of keratinized gingiva was 4.22mm ± 1.10 while mean gingival biotype was 1.5 mm ± 0.65. The correlation coefficient r=0.277 shows a positive correlation of width of keratinized gingiva with gingival biotype Conclusion: The study concluded that there is a positive correlation of gingival biotype with width of keratinized gingiva in maxillary anterior teeth. Keywords: gingival biotype, width of keratinized gingival, maxillary anterior teeth


2021 ◽  
Vol 10 (43) ◽  
pp. 3711-3714
Author(s):  
Leena Ammini Bhaskaran ◽  
Latha Sreedhar Lekshmi Sreedhar

BACKGROUND The posterior half of the foot is made of seven tarsal bones. Talus is seen above calcaneus. It has a head, neck and body. There are three facets anterior, middle and posterior facets that articulate with corresponding facets of the calcaneus. The middle and posterior facets are separated by a groove sulcus tali. We wanted to know the morphometric measurements of talus in South Keralites in this study. METHODS The study was done on 68 dry human tali of unknown age and sex in the Department of Anatomy, Government medical college, Trivandrum. The measurements were taken i.e., length, width and height of talus using vernier calipers. The length, width and height of sulcus tali were also measured. The range and mean of measurements were estimated. The calcaneal facets were studied and classified to find the most common and least common types. Data analysis was performed using SPSS ver 16.0. RESULTS The mean anteroposterior length of the talus was 4.84 ± 0.44 cm. The mean transverse length was 3.46 ± 0.47 cm. The mean height of the talus was 2.56 ± 0.31 cm. Anteroposterior length ranged from 3.84 to 6.07. The transverse length of the talus ranged from 2.81- 5 cm. Height of talus ranged from 2 - 3.2 cm. The mean anteroposterior length of sulcus tali was 2.09 ± 0.45 cm. The mean height of sulcus tali was 0.55 ± 0.09 cm. The mean width of sulcus tali was 0.62 ± 0.30 cm. Anteroposterior length of sulcus tali ranged from 1.4 - 3.8 cm. The transverse length of sulcus tali ranged from 0.34 to 1.6 cm. Height of sulcus tali ranged from 0.2 to 0.7 cm, regarding the type of facets, type 2 was most common and type 4 was found to be absent. CONCLUSIONS The adequate knowledge of the anatomy of the talus is significant not only to the anatomists but also to the orthopaedic surgeons as fractures of the talus are quite common and lead to avascular necrosis, arthritis and when unrecognized, chronic pain and non-union 3. Talectomy has been described as a limb-saving procedure for the treatment of neglected talipes equinovarus deformity. KEY WORDS Talus, Sulcus Tali, Calcaneal Facet Morphometric Measurements of Talus in South Keralites.


Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6198
Author(s):  
Ji-Sun Lee ◽  
Hyun-Woo Kim ◽  
Jun-Seo Lee ◽  
Hyun-Soo An ◽  
Chan-Moon Chung

The purpose of this study was to develop a microcapsule-type self-healing coating system that could self-heal cracks and then maintain the healed state even upon crack expansion. Mixtures consisting of a photoinitiator and two methacrylate components, bismethacryloxypropyl-terminated polydimethylsiloxane (BMT-PDMS) and monomethacryloxypropyl-terminated PDMS (MMT-PDMS), were transformed into viscoelastic semi-solids through photoreaction. The viscoelasticity of the reacted mixtures could be controlled by varying the mass ratio of the two methacrylates. Through a stretchability test, the optimal composition mixture was chosen as a healing agent. Microcapsules loaded with the healing agent were prepared and dispersed in a commercial undercoating to obtain a self-healing coating formulation. The formulation was applied onto mortar specimens, and then cracks were generated in the coating by using a universal testing machine (UTM). Cracks with around a 150-μm mean width were generated and were allowed to self-heal under UV light. Then, the cracks were expanded up to 650 μm in width. By conducting a water sorptivity test at each expanded crack width, the self-healing efficiency and capability of maintaining the healed state were evaluated. The B-M-1.5-1-based coating showed a healing efficiency of 90% at a 150-μm crack width and maintained its healing efficiency (about 80%) up to a 350-μm crack width. This self-healing coating system is promising for the protection of structural materials that can undergo crack formation and expansion.


2021 ◽  
Vol 8 (3) ◽  
pp. 190-193
Author(s):  
Chandragirish S ◽  
Harsha B R ◽  
Girish V Patil

Aim of the present study was to observe the measurements of anterior papillary muscles present in tricuspid valve of human heart. Measurements of anterior papillary muscles in tricuspid valve gains utmost importance in cardiac surgeries because they are the causes of myocardial infarction in recent times because of its variations and detection of these causes by advent in modern technologies which will help in treatment of tricuspid valve diseases. This study was carried out on 96 normal formalin fixed human heart specimens. Dissection was performed according to standard techniques. Anterior papillary muscles were observed and length, width and thickness of each muscle were measured and documented. In the present study, numbers of anterior papillary muscles were present with a frequency of 1-3, with most common appearance of 1 muscle in 66 hearts (68.8%) and least common incidence of 3 muscles in 6 hearts (6.3%). Anterior papillary muscles were present in all 96 hearts. In measurements, anterior papillary muscles mean height was 1.49±0.44 cm; mean width was 0.82±0.21 cm and mean thickness was 0.64±0.15 cm respectively. We hope this study will serve to understand the morphometry of anterior papillary muscles better and will help in various surgical procedures and cardiac treatment done on tricuspid valve.


2021 ◽  
Author(s):  
Kamal L Nahas ◽  
Viv Connor ◽  
Maria Harkiolaki ◽  
Colin M Crump ◽  
Stephen C Graham

Herpes simplex virus-1 (HSV-1) is a large, enveloped DNA virus and its assembly in the cell is a complex multi-step process during which viral particles interact with numerous cellular compartments such as the nucleus and organelles of the secretory pathway. Transmission electron microscopy and fluorescence microscopy are commonly used to study HSV-1 infection. However, 2D imaging limits our understanding of the 3D geometric changes to cellular compartments that accompany infection and sample processing can introduce morphological artefacts that complicate interpretation. In this study, we used a 3D imaging technique (soft X-ray tomography) to observe differences in whole-cell architecture between HSV-1 infected and uninfected cells. To protect the near-native structure of cellular compartments, we used a non-disruptive sample preparation technique involving rapid cryopreservation. We observed viral capsids and assembly intermediates interacting with nuclear and cytoplasmic membranes. Furthermore, we observed differences in the morphology of specific organelles between uninfected and infected cells. The local concentration of cytoplasmic vesicles at the juxtanuclear compartment increased and their mean width decreased as infection proceeded. Furthermore, mitochondria in infected cells were elongated and highly branched, suggesting that altered dynamics of mitochondrial fission/fusion accompany HSV-1 infection. Our results demonstrate that high-resolution 3D images of cellular compartments can be captured in a near-native state using soft X-ray tomography and have revealed that infection causes striking changes to the morphology of intracellular organelles.


Author(s):  
David Alonso-Gutiérrez ◽  
Silouanos Brazitikos

Abstract We prove several estimates for the volume, the mean width, and the value of the Wills functional of sections of convex bodies in John’s position, as well as for their polar bodies. These estimates extend some well-known results for convex bodies in John’s position to the case of lower-dimensional sections, which had mainly been studied for the cube and the regular simplex. Some estimates for centrally symmetric convex bodies in minimal surface area position are also obtained.


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