Srinivasan Chandrasekaran
Srinivasan Chandrasekaran, Indian organic chemist (Tamil Nadu 15 November 1945 – Developed and improved many new synthetic routes for a wide variety of chemicals SOME CONTRIBUTIONS With P.V. Balaji reported the first general method for the geminal amination and an intermolecular metal-free germinal amino oxygenation of vinylarenes using hypervalent iodine reagent (2016) Developed a simple method for the synthesis of a range of functionalized organoselenium compounds by nucleophilic ring opening of a variety of doubly activated cyclopropanes with diselenides under strictly nucleophilic conditions being the first report of a generalized procedure for the ring opening of various doubly activated cyclopropanes by using diselenides (2015) Presented the first studies of the reactivity of carbohydrate vinylcyclopropanes towards the synthesis of densely functionalized oxepane analogues (2014) With P.V. Balaji first to report on the non-Wacker intermolecular germinal oxyamination of styrenes through a domino process (2013) With S. Devarajulu & P. Gopinath discovered a new selena-aza-Payne type rearrangement of aziridinemethanoltosylates mediated by tetraselenotungstate (2012) With R. Ramapanicker, R. Gupta & R. Megha demonstrated the utility of propargyl esters as a protecting group for carboxyl groups in solution-phase peptide synthesis (2011) With R. Ramesh. But-2-ynylbisoxycarbonyl chloride: a novel C2-symmetric reagent for the protection of amines and amino acids. Organic Lett. 7:4947-50, 2005 INTRODUCED Tetrathiomolybates as reagents for sulfur transfer reaction and induced internal redox reaction Reagents system of PDC/t-butyl hydroperoxide for allylic oxidation Ruthenium based catalysts and nanostructured amorphous metals and alloys as catalysts for aerobic oxygen transfer reactions
Sixto Coscarón
Sixto Coscarón Conejo (General Fernandez Oro, near Cipolletti, Rio Negro Province 06 AQugust 1926 – La Plata, Buenos Aires Province 06 January 2022) DESCRIBED DIPTERA TAXA Tribe Mycteromyini 1979 with Philip Genera/Subgenera Araucnephia 1973 with Wygodzinsky Araucnephioides 1973 with Wygodzinsky Archeomytes 1971 with Philip Austromyans 1971 with Philip Cnesiamima 1973 with Wygodzinsky Curumyia 1976 Eremulium 2020 with Gil-Azevedo Fairchildimyia 1971 with Philip Haematopotina 1967 with Philip Inaequalium 1984 with Wygodzinsky Mayacnephia 1973 with Wygodzinsky Nubiloides 1967 Paraustrosimulium 1962 with Wygodzinsky Pedrowygomyia 1998 with Miranda Esquivel Promycteromyia 1979 with Philip Species 164 valid Chilopoda Species / Subspecies Otostigmus (Parotostigmus) cavalcanti iberaensis 1955 Otostigmus (Parotostigmus) dolosus argentinensis 1955 Otostigmus (Parotostigmus saltensis 1955 Pectiniunguis argentiniensis 1955 with Pereira Schendylops pampeanus 1975 with Pereira HONORS (Diptera) Coscaronia Cortés 1979 Coscaroniellum Py-Daniel 1983 LINKS https://www.scielo.org.mx/pdf/azm/v39/2448-8445-azm-39-e2648.pdf (biography, bibliography and taxa described; in Spanish)
Sivaramakrishna Chandrasekhar
Sivaramakrishna Chandrasekhar, Indian physicist (Calcutta 06 August 1930 – Bangalore 08 March 2004) Brother of material scientist Sivaraj Ramaseshan Relative of Nobel prize winners being nephew of physicist C.V. Raman and cousin of astrophysicist Subramanyan Chandrasekhar Predicted and discovered a new kind of liquid crystals, the discotic liquid crystals (1977) Proposed a new type of quadratic formula for the optical rotary dispersion of crystals Proposed and developed a simple method for estimating extinction effects experimentally in crystal analysis by the use of polarize x-rays (1960) With V.N. Madhusudana & P.P. Kant developed a simple and direct method to measure twist elastic constant (1973) With R. Nityananda, U.D. Kini & K.A. Suresh discovered the optical analogue of Borrmann effect in crystals (1975) With B.K. Sadashiva & K.A. Suresh discovered a new type of liquid crystal phase (1977) Established the physical behavior and properties of discotic systems Demonstrated that liquid crystals properties could be induced in non-mesomorphic materials by pressure and conversely that mesophases in some systems could be suppressed Synthesized the first paramagnetic nematogenic compounds HONORS Friedericksz Medal, Liquid Crystalline Society of the Russian Academy of Sciences (2000) LINKS http://dspace.rri.res.in/bitstream/2289/2285/1/2005%20Biog%20Mem%20INSA%20V28%20p133.pdf His brother, Sivaramakrishna Pancharatnam, physicist (Calcutta 09 February 1934 – Oxford 20 May 1969) Discovered the geometric phase in optics (Pancharatnam-Berry phase) in 1965 Demonstrated the connection between light shifts and dispersion
Shya Chitaley
Shyamala Dixit Chitaley, Indian / US palaeobotanist (Nasik, Maharashtra State 15 February 1918 – Ashland, Massachusetts, USA 31 March 2013) Born Shyamala Dixit DEVELOPED METHODS / TECHNIQUES With D.V. Chitaley. New technique of preparing specimens for herbarium. Sci. Cult. 30:341, 1964 An improved method of mounting fossil sections. Ann. Bot. 29:225-7, 1965 With S.U. Deshpande. A new method of pollen preparation. J. Palynol. 5(2):128, 1969 With M.Z. Patel. A new technique for permanent preparations of fossil microflora. Jour. Palyn. 5(2):132-3, 1970 With D.V. Chitaley. A new technique for preparing permanent stained microslides (1970) A technique of preserving fossilized material in coal balls using wax or a paraffin wax technique for preserving pyritic coal balls (Chitaley technique) A new technique for thin sections of pyritized permineralizations. Rev. Palaeobot. Palynol. 45:301-6, 1985 DESCRIBED FOSSIL PLANTAE GENERA Acanthacioxylon 1970 with Patil Aerophyllites 1971 with Patil Aerorhizos 1968 Apocynaceoxylon 1970 with Paradkar & Subnedar Bisporangistrobus 1988 Clevelandodendron 1996 with Pigg Daberocarpon 1973 with Sheikh Deccananthus 1974 with Kate Deccanites 1985 with Kapgate & Sheikh Deccanostrobus 2007 with Kapgate & Awasthi Dicotyloxylon 1971 with Patel Graminocarpon 1971 with Sheikh Harrisocarpon 1973 with Nambudiri Harrisostrobus 1973 with Sheikh Helminthosporites 1971 with Sheikh Keraocarpon 1999 with Ohana & Kimura Krempocarpon 1974 with Kate Krempogonium 2004 with Nambudiri & Yawale Marsileaites 2004 with Nambudiri Nothothylites 1980 with Yawale Pantea 1977 with Yawale Perrottettioxylon 1971 with Patil & Hunnargikar Prakashites 1977 with Yawale Raoanthus 1975 with Patel Rhamnoxylon 1972 with Kate Sahniocarpon 1973 with Patil Salvinites 1991 with Nambudiri Smeadia 2004 with Li Sonneratiorhizos 1969 Surangea 1972 with Sheikh Triloculaire 1974 with Patel Xinjiangostrobus 2002 with Mai & Dou Pollen/ Sporae Rhamnacidites 1951 Tetradomonoporites 1951 OTHERS Azolla deccaniana 1991 with Nambudiri Monosulcites medius 1951 HONORS (FOSSIL) Chitaloxylon Sheikh 1971 (Plantae) Chitaleypushpam Paradkar 1971 (Plantae) Chitaleocarpon Kapgate 2000 (Plantae) Chitaleya Prasad et al. 2005 (Phytolith)
Shupeng Chen
Shupeng Chen, Chinese geographer and cartographer (Pingxiang, Jiangxi Province February 1920 – Beijing 25 November 2008) Developed geoinformation science Authored Geo-information science and digital earth (2004), maybe the first book specifically dedicated to the concept of digital earth Designed an information system Advocated the concept of geo-information Tupu, a new type of atlas (1990s) Proposed a raster coding system based on information mechanism (1986) Proposed the idea of geo-information mechanism (1994) HONOURS O.M. Miller Cartographic Award, American Geographical Society (1998) Carl Mannerfelt Gold Medal, International Cartographical society (2001) Contribution Prize, International Karst Society (2001)
Shiing Shen Chern
Shiing Shen Chern, US / Chinese mathematician (Jia Xin, Chekiang Province 26 October 1911 – Tianjin 03 December 2004) Considered as founder of global differential geometry and integral hyperbolic geometry Introduced Hermitian geometry to multiple complexes Introduced the concept of Hermitian connections With E.H. Spanier proved Thom isomorphism independent from René Thom (1951) Enunciated Chern theorem (1953) With Levine and Nirenberg defined intrinsic norm about complex manifold cohomology HONORS Mathematics Wolf Prize (1983) Mathematics Shaw Prize (2004) Asteroid Chern (29552) EPONYMY Chern characteristic class (1946) Chern forms Chern-Simons form Chern-Moser invariants (1974) Chern-Simons invariants (1971) Chern-Simons secondary characteristic class Bernstein-Heinz-Chern inequalities Chern-Barbosa method Chern-do Carmo-Kobayashi conjecture Chern character Chern-Weil homomorfism (1949) Blaschke-Chern-Santalo theorem Chern isomorphism