7 results on '"Murugappan, S. P."'
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2. Parametric study of the Hartmann–Sprenger tube
- Author
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Murugappan, S. and Gutmark, E.
- Published
- 2005
- Full Text
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3. Numerical and Experimental Crashworthiness Determination of Aluminum Tube Sections
- Author
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Kumar, S. Suresh, Murugappan, S., and Manikanda Balaji, V.
- Abstract
Generally, vehicle safety is a vital issue in the field of automobile industry. Ensuring the safety of passengers is one of the prime challenges for vehicle design engineers. Automobile safety can be determined from the ability of vehicle structure and its internal support systems to protect the occupants from injuries during an accident. In the present work an attempt has been made to determine the dynamic crash characteristics of hollow aluminum tubes for various impact velocities using numerical technique. Aluminum tubes with diagonal ribs were modeled with and without considering the presence of cracks. Surface cut outs were introduced to verify their influence on energy absorption. One of the important crash parameter peak force experienced by the tubes with rib is compared with tubes without rib. Reduced peak force was observed for the tubes with ribs compared to the ones without ribs, which indicates higher energy absorbing capacity of the tube with the presence of ribs. Significant increase in initial peak force (R
F ) was noticed with increase of impact velocity. Higher impact energy absorption was noted for a structure with the presence of slit. Experiments were conducted on ribbed hollow tubes and specimens with through hole at the center of the specimen. Results indicate that, ribbed specimens provide significant reduction of peak force compared to bare specimen.- Published
- 2014
- Full Text
- View/download PDF
4. Nucleotide receptor signaling in platelets
- Author
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KAHNER, B.N., SHANKAR, H., MURUGAPPAN, S., PRASAD, G.L., and KUNAPULI, S.P.
- Abstract
Upon injury to a vessel wall the exposure of subendothelial collagen results in the activation of platelets. Platelet activation culminates in shape change, aggregation, release of granule contents and generation of lipid mediators. These secreted and generated mediators trigger a positive feedback mechanism potentiating the platelet activation induced by physiological agonists such as collagen and thrombin. Adenine nucleotides, adenosine diphosphate (ADP) and adenosine triphosphate (ATP), released from damaged cells and that are secreted from platelet‐dense granules, contribute to the positive feedback mechanism by acting through nucleotide receptors on the platelet surface. ADP acts through two G protein‐coupled receptors, the Gq‐coupled P2Y1receptor, and the Gi‐coupled P2Y12receptor. ATP, on the other hand, acts through the ligand‐gated channel P2X1. Stimulation of platelets by ADP leads to shape change, aggregation and thromboxane A2generation. ADP‐induced dense granule release depends on generated thromboxane A2. Furthermore, costimulation of both P2Y1and P2Y12receptors is required for ADP‐induced platelet aggregation. ATP stimulation of P2X1is involved in platelet shape change and helps to amplify platelet responses mediated by agonists such as collagen. Activation of each of these nucleotide receptors results in unique signal transduction pathways that are important in the regulation of thrombosis and hemostasis.
- Published
- 2006
- Full Text
- View/download PDF
5. Different G protein‐coupled signaling pathways are involved in α granule release from human platelets
- Author
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Quinton, T.M., Murugappan, S., Kim, S., Jin, J., and Kunapuli, S.P.
- Abstract
Alpha granule release plays an important role in propagating a hemostatic response upon platelet activation. We evaluated the ability of various agonists to cause α granule release in platelets. Alpha granule release was measured by determining P‐selectin surface expression in aspirin‐treated washed platelets. ADP‐induced P‐selectin expression was inhibited both by MRS 2179 (a P2Y1 selective antagonist) and AR‐C69931MX (a P2Y12 selective antagonist), suggesting a role for both Gαqand Gαipathways in ADP‐mediated α granule release. Consistent with these observations, the combination of serotonin (a Gαqpathway stimulator) and epinephrine (a Gαzpathway stimulator) also caused α granule release. Furthermore, U46619‐induced P‐selectin expression was unaffected by MRS 2179 but was dramatically inhibited by AR‐C69931, indicating a dominant role for P2Y12 in U46619‐mediated α granule release. Additionally, the Gα12/13‐stimulating peptide YFLLRNP potentiated α granule secretion in combination with either ADP or serotonin/epinephrine costimulation but was unable to induce secretion by itself. Finally, costimulation of the Gαiand Gα12/13pathways resulted in a significant dose‐dependent increase in α granule release. We conclude that ADP‐induced α granule release in aspirin‐treated platelets occurs through costimulation of Gαqand Gαisignaling pathways. The P2Y12 receptor plays an important role in thromboxane A2‐mediated α granule release, and furthermore activation of Gα12/13and Gαqsignaling pathway can cause α granule release.
- Published
- 2004
- Full Text
- View/download PDF
6. Extremum-seeking adaptive controller for swirl-stabilized spray combustion
- Author
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Murugappan, S., Gutmark, E.J., Acharya, S., and Krstic, M.
- Published
- 2000
- Full Text
- View/download PDF
7. Effects of tranexamic acid on death, vascular occlusive events, and blood transfusion in trauma patients with significant haemorrhage (CRASH-2) a randomised, placebo-controlled trial
- Author
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Olldashi, F., Kerçi, M., Zhurda, T., Ruçi, K., Banushi, A., Traverso, M. S., Jiménez, J., Balbi, J., Dellera, C., Svampa, S., Quintana, G., Piñero, G., Teves, J., Seppelt, I., Mountain, D., Balogh, Z., Zaman, M., Druwé, P., Rutsaert, R., Mazairac, G., Pascal, F., Yvette, Z., Chancellin, D., Okwen, P., Djokam-Liapoe, J., Jangwa, E., Mbuagbaw, L., Fointama, N., Pascal, N., Baillie, F., Jiang, J. -Y, Gao, G. -Y, Bao, Y. -H, Morales, C., Sierra, J., Naranjo, S., Correa, C., Gómez, C., Herrera, J., Caicedo, L., Rojas, A., Pastas, H., Miranda, H., Constaín, A., Perdomo, M., Muñoz, D., Duarte, Á, Vásquez, E., Ortiz, C., Ayala, B., Delgado, H., Benavides, G., Rosero, L., Mejía-Mantilla, J., Varela, A., Calle, M., Castillo, J., García, A., Ciro, J., Villa, C., Panesso, R., Flórez, L., Gallego, A., Puentes-Manosalva, F., Medina, L., Márquez, K., Romero, A. R., Hernández, R., Martínez, J., Gualteros, W., Urbina, Z., Velandia, J., Benítez, F., Trochez, A., Villarreal, A., Pabón, P., López, H., Quintero, L., Rubiano, A., Tamayo, J., Piñera, M., Navarro, Z., Rondón, D., Bujan, B., Palacios, L., Martínez, D., Hernández, Y., Fernández, Y., Casola, E., Delgado, R., Herrera, C., Arbolaéz, M., Domínguez, M., Iraola, M., Rojas, O., Enseñat, A., Pastrana, I., Rodríguez, D., La Campa, S. Á, Fortún, T., Larrea, M., Aragón, L., Madrazo, A., Svoboda, P., Izurieta, M., Daccach, A., Altamirano, M., Ortega, A., Cárdenas, B., González, L., Ochoa, M., Ortega, F., Quichimbo, F., Guiñanzaca, J., Zavala, I., Segura, S., Jerez, J., Acosta, D., Yánez, F., Camacho, R., Khamis, H., Shafei, H., Kheidr, A., Nasr, H., Mosaad, M., Rizk, S., El Sayed, H., Moati, T., Hokkam, E., Amin, M., Lowis, H., Fawzy, M., Bedir, N., Aldars, M., Rodríguez, V., Tobar, J., Alvarenga, J., Shalamberidze, B., Demuria, E., Rtveliashvili, N., Chutkerashvili, G., Dotiashvili, D., Gogichaishvili, T., Ingorokva, G., Kazaishvili, D., Melikidze, B., Iashvili, N., Tomadze, G., Chkhikvadze, M., Khurtsidze, L., Lomidze, Z., Dzagania, D., Kvachadze, N., Gotsadze, G., Kaloiani, V., Kajaia, N., Dakubo, J., Naaeder, S., Sowah, P., Yusuf, A., Ishak, A., Selasi-Sefenu, P., Sibiri, B., Sarpong-Peprah, S., Boro, T., Bopaiah, K., Shetty, K., Subbiah, R., Mulla, L., Doshi, A., Dewan, Y., Grewal, S., Tripathy, P., Mathew, J., Gupta, B., Lal, A., Choudhury, M., Gupta, S., Chug, A., Pamidimukkala, V., Jagannath, P., Maharaj, M., Vommi, R., Gudipati, N., Chhang, W. H., Patel, P., Suthar, N., Banker, D., Patel, J., Dharap, S., Kamble, R., Patkar, S., Lohiya, S., Saraf, R., Kumar, D., Parihar, S., Gupta, R., Mangual, R., Alagumuthu, Kooper, D., Mohapatra, C., David, S., Rajaleelan, W., Pangi, A., Saraf, V., Chikareddy, S., Mankar, S., Golhar, A., Sakhare, R., Wagh, N., Hazarika, D., Chaudhuri, P., Ketan, P., Purohit, G., Purohit, Y., Pandya, M., Kiran, S., Walia, S., Goyal, S., Attri, A., Sharma, R., Oberai, A., Oberai, M., Oberoi, S., Tripathi, G. K., Peettakkandy, V., Karuthillath, P., Vadakammuriyil, P., Pol, J., Pol, S., Saste, M., Raul, S., Tiwari, S., Nelly, N., Chidambaram, M., Kollengode, V., Thampan, S., Rajan, S., Raju, S., Babu, S. V., Sumathi, C., Chatterjee, P., Agarwal, A., Magar, H., Magar, M., Singh, M., Gupta, D., Haloi, K., Sagdeo, V., Giri, P., Verma, N., Jariwala, R., Goti, A., Prabhu-Gaonkar, A., Utagi, S., Joshi, M., Agrawal, R., Sharma, G., Saini, G., Tewari, V., Yadav, Y., Parihar, V., Venkataramana, N., Rao, S., Reddy, N., Chander, S. G., Hathila, V., Das, V., Agaja, K., Purohit, A., Lahari, A., Bhagchandani, R., Vidyasagar, B., Sachan, P. K., Das, T., Vyas, S., Bhattacharjee, S., Sancheti, P., Manoj, T., Moideen, M., Pansey, K., Chandrasekaran, V. P., Saikia, K., Tata, H., Vhora, S., Shah, A., Rangad, G., Rajasekaran, S., Shankarlal, S. T., Devadoss, S., Saleem, M., Pillay, H., Hazarika, Z., Deshmukh, P., Murugappan, S. P., Jaiswal, A., Vangani, D., Modha, P., Chonzik, C., Praveen, M., Sethurayar, V., Ipe, S., Shetty, N., Gupta, R. P., Jain, V., Shah, K., Dwikoryanto, M., Golden, N., Atmadjaya, K., Wiargitha, K., Sudiasa, K., Suwedagatha, G., Bal Afif, F., Budipramana, V., Tabrani, Lemuel, A., Chandra, S., Ama, F., Sherafatkazemzadeh, E., Moradi, E., Sheikhi, A., Ziaee, A., Fanaei, A., Hajinasrollah, E., Amini, A., Mohammad, B., Hadi, N., Perone, G., Peri, E., Volpi, A., Johnson, J., Abe, M., Mutiso, V., Okanga, B., Ojuka, D., Abdullah, B., Rahman, H., Noh, Y., Jamaluddin, S., Dawal, H., Roslani, A., Law, C. -W, Devashanti, P., Wahab, Y., Velaiutham, S., Dato, R., Loría, J., Montes, E., Gómez, E., Cazales, V., Bautista, P., Bautista, R., Ahumada, D., Hernández, E., Velásquez, G., Ortega, P., Lira, G., Estrada, F., Casasola, J., Olaomi, O., Abubakar, Y., Apollo, K., Badejo, O., Ihekire, O., Iribhogbe, P., Oludiran, O., Obeta, E., Okojie, C., Udefiagbon, E., Komolafe, E., Olaleye, P., Uzochukwu, T., Onakpoya, U., Dongo, A., Uhunmwagho, O., Eighemerio, E., Morgan, E., Thanni, L., Afolabi, A., Akinola, T., Ademola, A., Akute, O., Khalid, L., Abubakar, L., Aminu, M., Ogirima, M., Attansey, A., Michael, D., Aremu, O., Olugbenga, O., Ukpong, U., Salman, Y., Obianyo, N., Ani, C., Ezeadawi, R., Kehinde, O., Olaide, A., Jogo, A., Bitto, T., Anyanwu, S., Mbonu, O., Oludara, M., Somoye, M., Shehu, B., Ismail, N., Katchy, A., Ndoma-Egba, R., Grace-Inah, N., Songden, Z., Abdulraheem, A., Otu, A., Nottidge, T., Inyang, D., Idiapho, D., Giebel, H., Hassan, R., Adisa, A., Akinkuolie, A., Okam, K., Musa, A., Falope, I., Eze, J., Caballero, J., Azabache, W., Salirrosas, O., Soto, A., Torres, E., Ramírez, G., Malca, C., Velez, J., Yepez, R., Yupanqui, H., Lagos, P., Rodriguez, D., Flores, J., Moya, A., Barrionuevo, A., Gonzales-Portillo, M., Nunez, E., Eldawlatly, A., Al Naami, M., Delvi, B., Khalid, K., Alyafi, W., Djurovic, B., Ng, I., Yaghi, A., Laincz, A., Trenkler, S., Valky, J., Modiba, M., Legodi, P., Rangaka, T., Wallis, L., Muñoz, Á, Serrano, A., Misis, M., Rubi, M., La Torre, V., Ellawala, R., Wijeratna, S., Gunaratna, L., Wijayanayaka, C., Nungu, K., Billy Haonga, Mtapa, G., Yutthakasemsunt, S., Kittiwattanagul, W., Piyavechvirat, P., Impool, T., Thummaraj, S., Salaeh, R., Tangchitvittaya, S., Wattanakrai, K., Soonthornthum, C., Jiravongbunrod, T., Meephant, S., Subsompon, P., Pensuwan, P., Chamnongwit, W., Jerbi, Z., Cherif, A., Nash, M., Harris, T., Banerjee, J., Freij, R., Kendall, J., Moore, S., Townend, W., Cottingham, R., Becker, D., Lloyd, S., Burdett-Smith, P., Mirza, K., Webster, A., Brady, S., Grocutt, A., Thurston, J., Lecky, F., Goodacre, S., Mulla, Y., Sakala, D., and Chengo, C.
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