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Prakash Chandra,Dixit Ambesh 한국물리학회 2022 Current Applied Physics Vol.41 No.-
Using a low-cost hydrothermal method, we demonstrated the fabrication of phase pure rutile phase high-density vertically aligned TiO2 nanorods-based catalyst-free hydrogen (H2) gas sensor. The synthesized TiO2 nanorods on FTO are decorated with the aluminum interdigitated electrode pattern for electrical measurements. TiO2 nanorods-based hydrogen sensor showed the optimum response of ~53.18% at 150 ppm H2 concentration relative to air at 100 ◦C. The measured response and recovery time of TiO2 nanorods are 85 and 620 s, respectively. The TiO2 nanorods-based H2 gas sensor showed a relatively better response, good reproducibility, and stability at moderate temperatures, i.e., 50 and 100 ◦C. The electrochemical impedance measurements showed a small variation in the surface characteristics of TiO2 nanorods before and after exposing H2 gas. The carrier lifetime at 50 ◦C and 100 ◦C at 150 ppm are 5 μs and 3 μs, respectively. Interestingly, H2 selectivity is also observed against H2S, CO, and NH3 gases, suggesting that high-density vertically aligned TiO2 nanorods can be a good candidate for efficient hydrogen sensing at relatively low temperatures.
Quantitative Analysis of Growth of Cells on Physicochemically Modified Surfaces
Prakash Chandra,김지혜,Seog Woo Rhee 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.2
In this study, we describe the most expected behavior of cells on the modified surface and the correlation between the modified substrates and the response of cells. The physicochemical characteristics of substrates played an essential role in the adhesion and proliferation of cells. Glass and polymer substrates were modified using air plasma oxidation, and the surfaces were coated with self-assembled monolayer molecules of silanes. The PDMS substrates embedded with parallel micropatterns were used for evaluation of the effect of topologically modified substrate on cellular behaviour. BALB/3T3 fibroblast cells were cultured on different surfaces with distinct wettability and topology, and the growth rates and morphological change of cells were analyzed. Finally, we found the optimum conditions for the adhesion and proliferation of cells on the modified surface. This study will provide insight into the cell-surface interaction and contribute to tissue engineering applications.
Prakashchandra Shetty,Satheesha B Nayak 대한해부학회 2014 Anatomy & Cell Biology Vol.47 No.4
Congenital anomalies such as positional anomalies of the right half of the colon are more common when compared to its left half. We report a rare case of congenital anomaly where the transverse colon was totally absent. Ascending colon continued as descending colon at the right colic flexure. Ascending and descending colons formed an inverted U shaped loop which was situated in the right half of the abdomen. The sigmoid colon began from the descending colon, on the right side of the midline and coursed to the left iliac fossa. The terminal part of ascending colon and entire descending colon had a persistent mesocolon. The jejunum and ileum were situated in the upper left part of the abdominal cavity. This anomaly can cause volvulus of the colon at any stage of life. Furthermore, the knowledge of this anomaly is very useful for radiologists, gastroenterologists and surgeons.
A rare case of persistent jugulocephalic vein and its clinical implication
Prakashchandra Shetty,Satheesha B. Nayak,Rajesh Thangarajan,Melanie Rose D’Souza 대한해부학회 2016 Anatomy & Cell Biology Vol.49 No.3
Persistence of jugulocephalic vein is one of the extremely rare variations of the cephalic vein. Knowledge of such a variation is of utmost importance to orthopedic surgeons while treating the fractures of the clavicle, head and neck surgeons, during surgery of the lower part of neck, for cardiothoracic surgeons and radiologists during catheterization and cardiac device placement. We report the persistent jugulocephalic vein in an adult male cadaver, observed during the routine dissection classes. The right cephalic vein ascended upwards, superficial to the lateral part of the clavicle and terminated into the external jugular vein. It also gave a communicating branch to the axillary vein below the clavicle. We discuss the embryological and clinical importance of this rare variation.
Unusual morphology of the superior belly of omohyoid muscle
Rajesh Thangarajan,Prakashchandra Shetty,Srinivasa Rao Sirasanagnadla,Melanie Rose D'souza 대한해부학회 2014 Anatomy & Cell Biology Vol.47 No.4
Though anomalies of the superior belly of the omohyoid have been described in medical literature, absence of superior belly of omohyoid is rarely reported. Herein, we report a rare case of unilateral absence of muscular part of superior belly of omohyoid. During laboratory dissections for medical undergraduate students, unusual morphology of the superior belly of the omohyoid muscle has been observed in formalin embalmed male cadaver of South Indian origin. The muscular part of the superior belly of the omohyoid was completely absent. The inferior belly originated normally from the upper border of scapula, and continued with a fibrous tendon which ran vertically lateral to sternohyoid muscle and finally attached to the lower border of the body of hyoid bone. The fibrous tendon was about 1 mm thick and received a nerve supply form the superior root of the ansa cervicalis. As omohyoid mucle is used to achieve the reconstruction of the laryngeal muscles and bowed vocal folds, the knowledge of the possible anomalies of the omohyoid muscle is important during neck surgeries.
Sessile ileum, subhepatic cecum, and uncinate appendix that might lead to a diagnostic dilemma
Satheesha B. Nayak,Bincy Muthukattu George,Snigdha Mishra,Sudarshan Surendran,Prakashchandra Shetty,Surekha Devadasa Shetty 대한해부학회 2013 Anatomy & Cell Biology Vol.46 No.4
The subhepatic position of the cecum and appendix is a result of embryological reasons. Subhepatic appendicitis can cause diagnostic dilemmas. During the dissection of an adult male cadaver aged approximately 70 years, the subhepatic position of the cecum and appendix was noted. The appendix made a "U"-shaped bend and its tip was located in the paracolic position. The cecum had appendices epiploicae, and the terminal part of the ileum was retroperitoneal and had ascended vertically to the cecum from the right iliac fossa. Functionally, the sessile part of the ileum might restrict its peristaltic movements. The abnormal position of the terminal ileum might be mistaken for an ascending colon during laparoscopic surgery. The subhepatic position of the cecum and appendix might cause confusion in the diagnosis of acute appendicitis because the tenderness in such cases is not located at the McBurney's point.