Roberto Macias
Roberto Aristobulo Macías, Argentine mathematician (1944 – Salta 10 August 2022) CONTRIBUTIONS With C. Segovia. Weighted norm estimates for the maximal operator of the Laguerre functions heat diffusion semigroup. Studia Math. 172:149-67, 2006 With C. Segovia. Heat-diffusion maximal operators for Laguerre semigroups with negative parameters. J. Funct. Anal. 229(2):300-16, 2005 With M.S. Riveros. One-sided extrapolation at infinity and singular integrals (2000) With E. Harboure & C. Segovia. An extrapolation theorem for pairs of weights. Rev. Un. Mat. Argentina 40(3-4):37-48, 1997 With E. Harboure, C. Segovia & J.L. Torrea. Some estimates for maximal functions on Kothe function spaces. Israel J. Math. 90:349-71, 1995 With C. Segovia & J.L. Torrea. Singular integral operators with non-necessarily bounded kernels on spaces of homogeneous type. Adv. Math. 93:25-60, 1992 With E. Harboure & C. Segovia. A two weight inequality for the fractional integral when p=n/α. Proc. Amer. Math. Soc. 90:555-62, 1984 With C. Segovia. A well behaved quasi-distance for spaces of homogeneous type. Trab. Matem. Ser 1 32 (1981) With C. Segovia. A decomposition into atoms of distributions on spaces of homogeneous type. Adv. Mathem. 33(3):271-09, 1979 With C. Segovia. Weighted norm inequalities for parabolic fractional integrals. Studia Math. 61:279-91, 1977 With C. Segovia. A maximal theory for generalized Hardy spaces (1978) Eponym of Macias-Segovia symmetrization quasi-symmetric theorem
Roberto Eusebio Mancini
Roberto Eusebio Mancini Doria, Argentine morphologist (Buenos Aires 26 September 1914 – 03 February 1977) Son of Italian immigrants Internationally recognized as one of world’s foremost experts on histophysiology of human testis Performed studies about testes functions, connective tissue in human and animals and use of fluorescent substances Characterized cytological, embryological and histochemically the child human testis With R. Narvaitz & J.C. Lavieri. Origin and development of the germinative epithelium and Sertoli cells in the human testis. Cytological, cytochemical and quantitative study. Anat. Rec. 136:477-89, 1960 With O. Vilar, I.E. Lavieri, I.A. Andrade & I.I. Heinrich. Development of Leydig cells in the normal human testis. Am. J. Anat. 112:203-14, 1963 Characterized the cytology of cryptorchid testis With E. Rosemberg, M. Cullen, J.C. Lavieri, O. Vilar, C. Bergada & J.A. Andrada. Cryptorchid and scrotal human testis. I. Cytological, cytochemical and quantitative studies. Clin. Endocr. 25:911, 1965 Introduced protein fluorescent labeling for localization and flow With O. Vilar, J.M. Dellacha et al. Extravascular localization of fluorescent albumin, globulin and fibrinogen in connective tissue structures. J. Histochem. Cytochem. (1962) Proposed the role of connective tissue as a transient depot for the extravascular pool of serum proteins With L. Lustig & B. Denduchis authored the first report on the chemical properties of the basement membrane of the seminiferous tubular wall (1975) and demonstrated a partial immunological identity among basement membranes of distinct species (1977) With Carlos Yantorno introduced immunology into reproduction studies (1977) METHODS/TECHNIQUES With E. Sacerdote de Lustig introduced modifications to techniques for measuring the presence of glycogen in embryonary tissues (1941-2) Nueva reacción del yodo para la investigación del glucogenio en tejidos. Soc. Anat. Norm. Patol. 6:628, 1946 With R. Celani Barry. Nuevo metodo para investigar glucogenio em células de frottis. Rev. Soc. Arg. Biol. 28:6, 1942 With M.A. Etcheverry. A new reaction for polysaccharides. J. Nat. Cancer Inst. (1952) Villamil-Mancini method for c cytochrome oxidase SOME BIBLIOGRAPHY With I.C. Calamera, M.C. Morgenfeld & O. Vilar. Biochemical changes of the human serum produced by chlorambricil, testosterone propionate and human chorionic gonadotropin administration. Andrologia 11:43-50, 1979 With A.B. Mazzolli, O.D. Bustuoabad & C. Barrera. A new model for antisperm autoimmunity in guinea pigs. Int. J. Fertil. 21:49-54, 1976 With L. Lustig, B. Denduchis & N. Gonzalez. Immuno-histochemical study of rat seminiferous tubule wall structures. Int. J. Fertil. (1976) Immunologic aspects of testicular function (1976) With L. Martini. Male fertility and sterility (1974) With B. Denduchis & N. Gonzalez. Concentration of hydroxyproline in testes of hypohysectomized patients before and after treatment with gonadotropins and testosterone. J. Reprod. Fertil. 31:111-4, 1972 With O. Vilar, P. Donini & A. Perez Lloret. Effect of human urinary FSH and LH on the recovery of spermatogenesis in hypophysectomized patients. J. Clin. Endocrin. 33:388-91, 1971 With B. Denduchis & N. Gonzalez. Collagen content of testis from hypophysectomized patients before and after treatment with gonadotropins. Acta Europ. Fertil. (1970) With A.B. Castro & A.C. Seiguer. Electron microscopy study of the localization of labeled gonadotropins in the Sertoli and Leydig cells of the rat testis. Proc. Soc. Exp. Biol. Med. 133:582, 1970 Effect of different types of gonadotropins on the induction and restoration of spermatogenesis in the human testis. Acta Europ. Fertil. 1:401-29, 1969 With A.C. Seiguer & A.P. Lloret. Effect of gonadotropins on the recovery of spermatogenesis in hypophysectomized patients. Clin. Endocr. Metab. 29:467-78, 1969 With L. Lustig & H. Costantini. Serological and immunofluorescence study of soluble collagen in tissue culture of fibroblasts (1969) Testiculo humano (1968) With A. Castro & A.C. Seiguer. Histologic localization of follicle-stimulating and luteinizing hormones in the rat testis. J. Histochem. Cytochem. 15:516-25, 1967 With J.C. Lavieri, F. Muller, J.A. Andrada & D.J. Saraceni. Effect of prednisolone upon normal and pathologic human spermatogenesis. Fertil Steril. 17:500-13, 1966 With J.A. Andrada, C. Saraceni, A.E. Bachmann, J.C. Lavieri & M. Nemirovsky. Immunological and testicular response in men sensitized with human testicular homogenate. J. Clin. Endocr. Metabol. 25, 1965 With J. Alonso, J. Barquet, B. Alvarez & M. Nemirovsky. Histoimmmunological localization of hyaluronidase in bull testis. J. Reprod. Fertil. 8:325-30, 1964 With O.V. Davidson, O. Vilar, M. Nemirovsky & D.C. Bueno. Acrosomalantigenicity in rat testes. Fertil. Steril. 15:695-700, 1964 With O. Vilar, J.J. Hendrich, O.W. Davidson & B. Alvarez. Transference of circulating labeled serum proteins to the follicle of the rat ovary. J. Histochem. Cytochem. 11:80-8, 1963 With O. Vilar & M.I. Perez del Cerro. The Sertoli cells as a “bridge cell” between the basal membrane and the germinal cells. Histochemical and electron microscope observations. Exp. Cell Res. 237:158-61, 1962 With F.A. de la Balze, F. Arrillaga, M. Janches, O.W. Davidson & A.I. Gurtman. Male hypogonadism in hypothyroidism: a study of six cases. J. Clin. Endocrin. Metab. 22:212-22, 1962 With R. Narbaitz & J.C. Lavieri. A histological and histochemical study of ten post-natal development of germinal epithelium and Sertoli cells. Anat. Rec. 133:410, 1959 With M.F. Villamil. Tejido conectivo y enfermidades del colágeno (1959) With D. Brandes. L’incorporation du soufre radioactif Si5 par les mucopolysaccharides de la crete du coq. C.R. Soc. Biol. Paris 150:2020-1, 1956 With F.A. de la Balze, G.E. Bur & J. Irazu. Morphological and histochemical changes produced by estrogens on adult human testes. Fertil. Steril. 5:421-36, 1954 With J. Nolazco & F.A. de la Balze. Histochemical study of normal adult testes. Anat. Record 114:127, 1952 With M.H. Burgos. Mucopolisacaridios en la espermatogenesis del sapo. Rev. Soc. Arg. Biol. 24:318-27, 1948 Histochemical study of glycogen in tissues (1947) With C. Bergada. Effect of gonadotropins on the induction of spermatogenesis in human prepubertal testis
Ricardo Miledi
Ricardo Miledi y Dau, Mexican neurobiologist (Ciudad de Mexico 15 September 1927 – Irvine, California State 18 December 2017) Authored over 500 publications ACHIEVEMENTS Performed classical studies and discoveries about mechanisms of synaptic and neuromuscular transmission With B. Katz established that ion channels when acetylcholine stimulated let a current flow cells inward (1967-70) With B. Katz showed the existence of ion channels in neuromuscular synapses With B. Katz discovered that calcium ion influx in pre-synaptic terminal is required to produce neurotransmitter release (1965) With B. Katz reported the first estimate of the conductance of a synaptic channel (1970) With B. Katz introduced statistical analysis of transmitter induced voltage fluctuations (1972) Described the Katz-Miledi technique for measurement of synaptic delay at neuromuscular junction (1965) Discovered the plasticity of neurotransmitter receptors in the nervous system and how motor nerves control the chemical sensitivity of receptors at neuromuscular junctions Introduced the concept of extra synaptic receptors Introduced the concept of neuromodulation of synapse activity by endogenous agents (1960) Gave the first evidence of spillover of the neurotransmitter Discovered a new type of neurotransmitters receptor that play a role in inhibit neurons behavior Introduced technique of studying brain employing toad oocytes as model of neuron worldwide used First electrophysiological recording of frog oocyte Established heterologous expression of neurotransmitter receptors in oocytes Developed microtransplantation of native receptors Showed the molecular mechanisms of supersensitivity and extrasynaptic receptors (1959-60) Demonstrated GABA r receptors First to purify nicotinic acetylcholine receptor MEMBERSHIP/PRIZES Member, Royal Society of London (1970) Member, National Academy of Sciences (1989) Honorary Member, Hungarian Academy of Sciences Luigi Galvani Prize (1987) International King Faisal Prize for Sciences (1987)
Ricardo Mañé Ramírez
Ricardo Mañé Ramírez, Uruguayan / Brazilian mathematician (Montevideo 14 January 1948 –Montevideo 09 March 1995) World leader on dynamical systems Authored 51 works with 1,333 citations His book Introdução de teoria ergódica (Ergodic theory and differentiable dynamics) was translated into English language (1987) Showed that normal hiperbolicity is required for persistence of invariant manifolds (1974) Defined quasi-Anosov diffeomorphisms Proved that the interior in the C1 topology of the set of expansive diffeomorphisms is the set of quasi-Anosov diffeomorphisms (1975) Proved that a compact metric space exhibiting expansive homeomorphisms must be finite dimensional and every minimal set of such homeomorphisms is zero dimensional (1979) INTRODUCED With Paulo Sad & Sullivan the concept of holomorphic motion of a closed planar set (1983) Notion of critical value independently from other authors Notion of generic Lagrangian function Concept of ergodic closing lemma Proved the stability conjecture for C1 class diffeomorphisms (1988) EPONYMY Mañé theorem Mañé-Mather set Bochi-Mañé theorem Holder-Mañé theorem Mañé potential Mañé supercritical hypersurfaces Mañé conjecture Araujo-Mañé theorem Takens-Mañé theorem Mañé ergodic closing lemma Mañé-Sad-Sullivan theorem Mañé-Conze-Guivarc’h lemma Mañé critical values Aubry-Mañé sets Mañé hyperbolicity theorem Mañé projection Mañé-Lyubich measure Bowen-Mañé phenomenon Mañé genericity theorem HONOURS Two-time invited lecturer at International Congress of Mathematicians (1983 & 1994)
Ricardo Maldonado
Ricardo Maldonado C., Chilean histologist Developed with Herminia San Jose Lobo, the Maldonado-San Jose stain A phloxine azure hematoxylin sequence for differential staining of cells in pancreatic islets. Biotechnic & Histochemistry 42(1):11-13, 1967. SOME BIBLIOGRAPHY With H. San Jose, C. Martinoya & B. Gunther. Cell size and body weight in some homeotherms and poikilotherms. Acta Physiol. Lat. Am. 24:328-35, 1974 Estudio macroscopico, microscopico y histoquimico de Concholepas concholepas. Rev. Biol. Mar. 12(1-3):121-7, 1965 With F. Loebel S., Estudios histoquimicos sobre la sustancia de Nissl (1958)
Ricardo Francisco Marseillan
Ricardo Francisco Marseillan, Argentine-born Brazilian physiologist (Bahía Blanca 01 April 1933 – Ribeirão Preto, São Paulo State 04 May 1981) His major scientific contributions are the study of the effects of antibiotics on the cochlea and vestibular apparatus DEVELOPED METHODS Methods for studying electric activity of auditory pathway Techniques for implant of permanent electrodes for recording evoked potentials or single neuron activities With M. Grellet & Colafemina developed the calorie test with electron nystagmographic recording (1969) With J.V. P. Leite. Dourado eletrolítico de eletrodos para implantação permanente (1961) DEVELOPED EQUIPMENT Constructed stimulators, pre-amplifiers and other types of specialized electronic equipment Developed a solid-state signing-wave stimulator for automatic frame identification of kymograph oscilloscope photographs in A solid state sine-wave stimulator. Phys. Behav. 19:339-40, 1977 Constant-current isolating unit adaptable to any stimulator (1980) BIBLIOGRAPHY Brazilian J. Med. Biol. Res. 14:149, 1981