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- 저자 : Sumesh, K.V. (검색결과 9 건)
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Sumesh Sasidharan,Veerappan Arunachalam,Shanmugam Subramaniam 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.1
Finite-element analysis based on elasticeperfectly plastic material was conducted to examine the influence of structural deformations on collapse loads of circumferential through-wall critically cracked 90˚ pipe bends undergoing in-plane closing bending and internal pressure. The critical crack is defined for a through-wall circumferential crack at the extrados with a subtended angle below which there is no weakening effect on collapse moment of elbows subjected to in-plane closing bending. Elliptical and semioval cross sections were postulated at the bend regions and compared. Twice-elastic-slope method was utilized to obtain the collapse loads. Structural deformations, namely, ovality and thinning, were each varied from 0% to 20% in steps of 5% and the normalized internal pressure was varied from 0.2 to 0.6. Results indicate that elliptic cross sections were suitable for pipe ratios 5 and 10, whereas for pipe ratio 20, semioval cross sections gave satisfactory solutions. The effect of ovality on collapse loads is significant, although it cancelled out at a certain value of applied internal pressure. Thinning had a negligible effect on collapse loads of bends with crack geometries considered.
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Sanni Kapatel,C. K. Sumesh 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.1
In this work, we report the synthesis of binary semiconductor nanocomposite (NC) comprising spherical ZnO nanoparticlesstacked with two-dimensional MoS 2 nanosheets, utilizing a facile microwave assisted synthesis technique. The fabricatedproduct was characterized by X-ray diff raction, transmission electron microscopy, high-resolution transmission electronmicroscopy instrument, scanning electron microscopy, Raman spectroscopy, energy-dispersive X-ray spectroscopy (EDAX),inductively coupled plasma analysis and Fourier transform infrared spectroscopy to distinguish the structure and morphologyof arranged NC. Ultraviolet–visible spectroscopy was used to understand the optical properties of MoS 2 ·ZnO NC. Opticaltransmission spectra gave a distinct red shift in the band gap of ZnO after making composition with MoS 2 nanosheetswhich eventually shows higher retention of visible light. This occurs due to eff ective separation of photogenerated chargecarriers and rapid charge transfer to reactions sites of conduction band potentials of both ZnO and MoS 2 both. We plot thatMoS 2 ·ZnO NC has a band gap of 2.73 eV which is fundamentally a long way from the band gap of ZnO (~ 3.3 eV). Theoutcomes recommended the eff ective fading out of methylene blue (more than 95%) in 1 h on the illumination of visiblelight. Besides, the association of MoS 2 prevents photo-corrosion of the ZnO bringing about upgraded photostability of thecatalyst during the reaction. Moreover, we presented a recyclability test of the photocatalyst for fi ve subsequent times to getthe effi cient dye degradation.
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Aurora M. Kareh,Kashyap Komarraju Tadisina,Magnus Chun,Sumesh Kaswan,Kyle Y. Xu 대한성형외과학회 2022 Archives of Plastic Surgery Vol.49 No.4
Microvascular reconstruction frequently requires anastomosis outside of the zone of injury for successful reconstruction. Multiple options exist for pedicle lengthening including vein grafts, arteriovenous loops, and arteriovenous bundle interposition grafts. The authors performed a systematic review of arteriovenous bundle interposition grafts to elucidate indications and outcomes of arteriovenous grafts in microvascular reconstruction. A systematic review of the literature was performed using targeted keywords. Data extraction was performed by two independent authors, and descriptive statistics were used to analyze pooled data. Forty-four patients underwent pedicle lengthening with an arteriovenous graft from the descending branch of the lateral circumflex femoral artery. Most common indications for flap reconstruction were malignancy (n¼12), trauma (n¼7), and diabetic ulceration (n¼4). The most commonly used free flap was the anterolateral thigh flap (n¼18). There were five complications, with one resulting in flap loss. Arteriovenous bundle interposition grafts are a viable option for pedicle lengthening when free flap distant anastomosis is required. The descending branch of the lateral circumflex femoral artery may be used for a variety of defects and can be used in conjunction with fasciocutaneous, osteocutaneous, muscle, and chimeric free flaps.
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Linu Kuruvilla,MB Mohamed Sathik,Molly Thomas,Lisha P Luke,Sumesh KV 한국작물학회 2017 Journal of crop science and biotechnology Vol.20 No.5
Cold stress is one of the major abiotic factors that influence the productivity and geographical distribution of many agriculturally important crops like Hevea brasiliensis. Cultivation of H. brasiliensis in India is being extended to northeastern regions, where low temperature during winter adversely affects its survival, growth, and productivity. Developing cold-tolerant genotypes is a primary requisite to maximize the productivity under such challenging environmental conditions. However, lack of methods for early evaluation of cold tolerance in the newly developed clones and the extensive time required for assessing their tolerance in the field are major constraints for clonal selection. The present study was initiated with an objective to identify and characterize cold stress responsive miRNAs from H. brasiliensis that show stronger association with cold tolerance. Next generation sequencing using Illumina HiSeq method revealed the expression of 21 and 29 conserved miRNA (from clone RRIM 600) families in cold-stressed and control samples, respectively. Forty-two novel miRNAs were identified from this study. Upon differential expression analysis, eight conserved miRNAs were found commonly expressed in both the samples. When expression analyses were performed subsequently with six selected miRNAs in two Hevea clones (viz. RRII 105 and RRIM 600), miR169 showed a strong association with cold tolerance. miRNAs such as miR482 and miR159 also exhibited association with cold tolerance. This study suggests the possibility of employing these miRNAs as markers for cold tolerance after validation in more number of genotypes with varying levels of cold tolerance.
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Luke, Lisha P.,Sathik, M.B. Mohamed,Thomas, Molly,Kuruvilla, Linu,Sumesh, K.V. The Korean Society of Plant Biotechnology 2017 식물생명공학회지 Vol.26 No.4
Drought stress is one of the important factors that restrict the expansion of Hevea brasiliensis cultivation to non-traditional regions experiencing extreme weather conditions. Plants respond to drought stress by triggering expression of several drought responsive genes including transcription factors which in turn trigger expression of various downstream signalling pathways and adaptive networks. Expression of such drought responsive genes may revert back to their original level upon re-watering. However, no reports are available on such phenomenon in Hevea and hence, this study was initiated. For this purpose, NAC transcription factor (NAC tf) was chosen as candidate gene. Its expression levels were monitored under intermittent drought as well as irrigated conditions in two clones (RRII 105 and RRIM 600) of H. brasiliensis with contrasting tolerance level. Copy number of NAC tf was found similar in both the clones. Expression of NAC tf was found highly up-regulated in RRIM 600 (a relatively drought tolerant clone) than in RRII 105 (a relatively drought susceptible clone) throughout the drought incidences which upon re-watering, reached back to its original levels in both the clones. The study indicated the existence of an association between expression of NAC tf and drought tolerance trait exhibited by the tolerant clone RRIM 600. The study also proves the influence of drought and re-watering on the leaf photosynthesis and expression of NAC tf in H. brasiliensis.
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Lisha P. Luke,M. B. Mohamed Sathik,Molly Thomas,Linu Kuruvilla,K.V. Sumesh 한국식물생명공학회 2017 JOURNAL OF PLANT BIOTECHNOLOGY Vol.44 No.2
Drought stress is one of the important factors that restrict the expansion of Hevea brasiliensis cultivation to nontraditional regions experiencing extreme weather conditions. Plants respond to drought stress by triggering expression of several drought responsive genes including transcription factors which in turn trigger expression of various downstream signalling pathways and adaptive networks. Expression of such drought responsive genes may revert back to their original level upon re-watering. However, no reports are available on such phenomenon in Hevea and hence, this study was initiated. For this purpose, NAC transcription factor (NAC tf) was chosen as candidate gene. Its expression levels were monitored under intermittent drought as well as irrigated conditions in two clones (RRII 105 and RRIM 600) of H. brasiliensis with contrasting tolerance level. Copy number of NAC tf was found similar in both the clones. Expression of NAC tf was found highly up-regulated in RRIM 600 (a relatively drought tolerant clone) than in RRII 105 (a relatively drought susceptible clone) throughout the drought incidences which upon re-watering, reached back to its original levels in both the clones. The study indicated the existence of an association between expression of NAC tf and drought tolerance trait exhibited by the tolerant clone RRIM 600. The study also proves the influence of drought and re-watering on the leaf photosynthesis and expression of NAC tf in H. brasiliensis.
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