Giorgio Schreiber, Italian-born Jewish Brazilian cytologist and geneticist (Trieste 19 February 1905 – Belo Horizonte 01 January 1977)
Twin brother of Italian zoologist and hydrobiologist Bruno Schreiber
Authored 216 works
Known internationally for his studies on quantitative cytogenetics, cytochemistry and caryometry
Introduced the concept of ploido-megetic ratio, a DNA/nuclear volume ratio (1965)
Proposed the existence of an intermediate phase in the nuclear volume doubling that called it sesquiphase
Le grandezze nucleari nella spermatogenesi. La “sesquifase” nella intercinesi spermatogoniale. Atti R. Accad. Lincei R.C. Cl. Fís. Mat. Nat. Ser 8A 2t:843-7, 1947
Proposed the term elaxis for a proportional and discontinuous reduction of nuclear size during ontogenesis (1943)
Clarified the phenomenon of neoteny in Proteus sp.
With H.C. Carvalho & E. Paulini. Preliminary report on research towards the development of a standard test for insecticide-resistance and susceptibility in Drosophila. Bull. World Health Org. 24:664-8, 1961
First to verify that maternal and paternal spermatogenesis in ophidians don’t occur simultaneously
Perfected the cytophotometer
SOME BIBLIOGRAPHY
With T.M.C. Cavenaghi. DNA e volume nuclear em Enteropneusta, Tunicata, Cephalochordata e suas implicações filogenéticas. Bol. Zool. Biol. Mar. Univ. São Paulo (NS) 29(1):119-24, 1972
With W. Beçak, M.L.Beçak & D. Lavalle. Further studies on polyploid amphibians (Ceratophrydidae) 1967
Citologia quantitativa. I. An. Acad. Bras. Ciencias 38(1):137-41, 1966
With H.E. Belluomini, R.F. Mello & A.M. Penha. Cytological and ponderal researches on the testicle of Crotalus durissus terrificus during the annual cycle (1966)
With Y.X. Sant’Ana. Relação entre o volume nuclear e DNA nas classes submúltiplas cariométricas de Jacobj. Cienc. Cult. 16(2):179-81, 1964
With A.S. Guedes. Cytological aspects of the taxonomy of anophelines (Subgenus Nyssorhynchus). Bull. Wld Health Org. 24:657-8, 1961
With A.S. Guedes. Cytological and ecological researches on Brazilian anophelids. Rev. Bras. Malarial Doenças Trop. 11:97-8, 1959
With I. R. Kaiserman Abramof & R. Rozestraten. Researches on quantitative cytology. XIV. Nuclear and nucleolar sizes in neurosecretory cells. Anais Acad. Bras. Ciencias 30(2):175-205, 1958
With A.S. Guedes & E.M. Amorim. Análise dos cromossomos salivares em anofelinos brasileiros. Rev. Bras. Malariol. Doenças Trop. 9:247-9, 1957
With N.M.B. Melucci, I.R. Kaiserman Abramof & J.M.P. Memória. Researches on quantitative cytology. XIII. Quantitative variations of the nucleolus in secretory cells (1955)
Due meccanismi di variazione “quantica” del nucleolo. Publ. Staz. Zool. Napoli 27:283-94, 1955
With A. Groszman. Biometrical and cytological researches on tissues of inbred and hybrid corn caryopsis (1953)
Análise estatística da variação interfásica do volume nuclear. Thesis (1953)
Variações do volume nuclear e dos ácidos nucleicos durante a interfase (1952)
With J. Pellegrino. Análise citológica e cariométrica da ação da colchicina sobre a espermatogênese dos hemípteros. Mem. Inst. Oswaldo Cruz 49:513-42, 1951
Some basic factors concerning the variability of nuclear size. Anais Acad. Bras. Cien. 22:151-60, 1950
Statistical and physiological studies on the interphasic growth of the nucleus. Biol. Bull. 97(2):187-205, 1949
With R.F. de Melo & C.A. Salvatore. Pesquisas cariométricas no miométrio da camundonga. Anais Acad. Bras. Bras. Ciencias 21(4):267-74, 1949
With J. Pellegrino. Cytogenetical studies on Brazilian Hemiptera. Hereditas (Suppl) 656, 1949
A Terceira divisão e a dimegalia na espermatogênese dos ofídios. Gazeta Clin. (S. Paulo) 45(3-4):82, 1947
O crescimento interfásico do núcleo. Pesquisas cariométricas sobre a espermatogênese dos ofídios. Mem. Inst. Butantan 20:113-80, 1947
With C.A. Salvatore. Pesquisas cariométricas no ciclo estral e gravídico. Mem. Inst. Butantan 20, 1947
Pesquisas de citologia quantitativa: o crescimento interfásico das espermatogônias dos ofídios. Rev. Bras. Biol. 6(2):199-209, 1946
Estudo cariométrico dos poliploides de Coffea (Discussão do problema e primeiros resultados). Bragantia 6(7):279-97, 1946
Discontinuous and proportional decreasing of nuclear size in the liver of tadpole during development and metamorphism. Anat. Record 87(4), 1941
Il problema dell’accrescimento interfasico e della variazioni volumetriche dei nucleo durante lo sviluppo. Rend. Accad. Naz. dei Lincei 3:1-2 & 129-35,
O volume do núcleo durante o desenvolvimento embrionário e a interfase
With A.R. Hoge, H. W. Belluomini & A.M. Penha. Further researches on intersexuality in a highly isolated population of snakes
La cynétique nucléolaire dans la production des protéines cytoplasmiques. Ann. Histochem.