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| Registros recuperados: 50 | |
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| Schreuder, A.. |
| An upper molar of Anancus arvernensis (Croiz. & Job.), fished out of the Eastern Scheldt, near Ierseke, and belonging to the so-called black fossils, shows more affinity with the specimens from the English Crags than with those from Thüringen. Another upper molar of the species has been dredged out of the Lower-Rhine. A lower molar of Archidiskodon planifrons (Falc. & Caut.) from the same locality as the first-named tooth, and displaying the same kind of fossilization has most probably been washed out of the same deposit. Also in other parts of Europe the two animals lived together in the Upper-Pliocene, prae-Günzian period. Marine Amstelian deposits being absent in the greater part of Zealand, it is highly probable that a fauna of landmammals to... |
| Tipo: Article / Letter to the editor |
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| Ano: 1944 |
URL: http://www.repository.naturalis.nl/record/505919 |
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| Gruyter, J.G. de. |
| De koralenfauna van het Tertiair van Nederland was tot nu toe zeer onvolledig bekend. Krejci (1925) noemde het voorkomen van Flabellum cristatum, Fl. Pompeckji en Fl. Waelii, var. Dingdenensis van de Giffel bij Winterswijk en van Fl. Waelii van Maasbree. Vervolgens noemde Burck (1937) uit het Bartonien van Buurse en Boekelo een drietal koralen. Dit is alles wat ik aan gegevens over Nederlandsche koralen uit het Tertiair in de nieuwere literatuur heb kunnen vinden. Naast de, vaak zeer rijke, molluskenfauna van het Tertiair spelen de koralen dan ook een ondergeschikte rol en de meeste vormen zijn als gidsfossiel bovendien slecht te gebruiken, daar ze zich haast onveranderd in de verschillende formaties voortzetten. Vooral door het optreden van vele... |
| Tipo: Article / Letter to the editor |
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| Ano: 1944 |
URL: http://www.repository.naturalis.nl/record/505909 |
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| Gerth, H.. |
| Das am 21. November 1942 im beinahe vollendeten 92. Lebensjahr erfolgte Dahinscheiden des um die geologische Erforschung der niederländischen Kolonien in Ost- und Westindien so hoch verdienten Gelehrten veranlasst mich in dieser Zeitschrift, die ja die Fortsetzung der von Martin gegründeten „Sammlungen des Geologischen Reichsmuseum” ist, noch einmal auf die wissenschaftliche Bedeutung seines Lebenswerkes zurückzukommen. Die erfolgreiche Tätigkeit Martin’s als Dozent und Direktor des Reichsmuseum für Geologie und Mineralogie ist in der, anlässlich seines 80. Geburtstages herausgegebenen Festschrift 1) schon eingehend gewürdigt worden, auf seine wissenschaftliche Tätigkeit wurde bei dieser Gelegenheit nur kurz hingewiesen, sie war damals ja noch nicht... |
| Tipo: Article / Letter to the editor |
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| Ano: 1944 |
URL: http://www.repository.naturalis.nl/record/505683 |
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| Brieger,F. G.. |
| 1) It may seem rather strange that, in spite of the efforts of a considerable number of scientists, the problem of the origin of indian corn or maize still has remained an open question. There are no fossil remains or archaeological relics except those which are quite identical with types still existing. (Fig. 1). The main difficulty in finding the wild ancestor- which may still exist - results from the fact that it has been somewhat difficult to decide what it should be like and also where to look for it. 2) There is no need to discuss the literature since an excellent review has recently been published by MANGELSDORF and REEVES (1939). It may be sufficient to state that there are basically two hypotheses, that of ST. HILAIRE (1829) who considered... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1944 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761944000100011 |
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| Accorsi,Walter Radamés. |
| No trabalho que publiquei sobre a estrutura dos estômatos em relação às células anexas, na revista "O Solo" (2), ficou comprovado que na ordem Rubiales a família Rubiaceae é a íinica a apresentar a referida estrutura, o que me levou a sugerir a possibilidade de considerá-la como um caráter anatômico dos gêneros ou das espécies da família, dependendo da sua freqüência nos mencionados grupos. Em vista disso, resolvi estudar o maior número de gêneros e espécies de Rubiaceae, em relação à estrutura estomatar, começando pelo gênero Coffea, dada a sua grande importância econômica. Analisei 28 indivíduos, atraz relacionados e verifiquei, em todos, a constância das células anexas, de configuração bastante homogênea, detalhe este que poderá servir de base a... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1944 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761944000100008 |
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| Brieger,F. G.. |
| O presente trabalho não tem por fim discutir exaustivamente os fatos conhecidos e as hipóteses até hoje formuladas sobre o mecanismo da evolução. Êle apresenta apenas um resumo de alguns pontos, sem entrar numa discussão detalhada da literatura, com o fim de por em relevo principalmente os métodos como podem aparecer expontaneamente novos caracteres. As nossas considerações servem como uma introdução para alguns trabalhos experimentais, que serão publicados a seguir. A) - Conhecemos até agora os seguintes modos para a obtenção de novos caracteres fenotipos: 1) - Mutação gênica. 2) - Alteração citológica como poliploidia, polisomia e aberrações na estrutura cromossômica. 3) - Recombinação gênica, ou pela combinação de efeitos específicos de gens... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1944 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761944000100009 |
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| Piza Junior,S. de Toledo. |
| A preliminary account on the normal development of the imaginai discs in holometabolic Insects is made to serve as an introduction to the study of the hereditary homoeosis. Several facts and experimental data furnished specially by the students of Drosophila are brought here in searching for a more adequate explanation of this highly interesting phenomenon. The results obtained from the investigations of different homoeotic mutants are analysed in order to test Goldschmidt's theory of homoeosis. Critical examination of the basis on which this theory was elaborated are equally made. As a result from an extensive theoretical consideration of the matter and a long discussion of the most recent papers on this subject the present writer concludes that the... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1944 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761944000100006 |
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| Registros recuperados: 50 | |
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