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  • Articles  (17)
  • Springer  (17)
  • Cambridge University Press (CUP)
  • PANGAEA
  • 2010-2014
  • 1945-1949  (17)
  • 1935-1939
  • 1948  (17)
  • Biology  (17)
Collection
  • Articles  (17)
Years
  • 2010-2014
  • 1945-1949  (17)
  • 1935-1939
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 4 (1948), S. 391-394 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung InAmblystoma besitzen die präsumtiven Urnierenanlagen starke Tendenzen zur Selbstdifferenzierung, während der induktive Einfluß von seiten des primären Harnleiters eine mehr untergeordnete Rolle spielt. Dieser Einfluß auf die Differenzierung der Urnierenanlagen wird erst nach dem Auswachsen des Harnleiters zur Kloake ausgeübt. Der Differenzierungsgrad der Anlagen zeigt jedoch eine gewisse Abhängigkeit vom funktionellen Zustande des Harnleiters. Nach Entfernung der Vorniere ist die Differenzierungszone der Urnierenanlagen in verschiedenen Fällen ziemlich stark kranialwärts verschoben, was einen hemmenden Einfluß der Vorniere auf die Differenzierung der Urnierenanlagen im kranialen Abschnitt des Rumpfes andeuten könnte.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 4 (1948), S. 325-348 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Antonie van Leeuwenhoek 14 (1948), S. 33-50 
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 35 (1948), S. 376-376 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
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    Electronic Resource
    Springer
    Molecular genetics and genomics 82 (1948), S. 384-414 
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 6
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    Electronic Resource
    Springer
    Plant ecology 1 (1948), S. 51-57 
    ISSN: 1573-5052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resumo Metodo kaj supervido de karakterizado de nederlandaj herbejoj. Unue la metodo estas priskribita, lau kiu la tipoj de la nederlandaj herbejoj estas karakterizitaj. Estas la plantsociologia frenkventmetodo kaj gi garantias sufican konstantecon de la valoroj, kontraue al la pesanaliza kaj la nombra metodoj, kiuj ofte donas tro grandajn diferencojn depende de la momento, kiam oni prenas la specimenojn. Por ke la frekventmetodo havu ankau utilon por la agronomio, la aremezuro estas difinita tre malgranda, nome 1/4 dm2. Tiukaze oni estas sufice certa, ke la plej frekventaj specoj, ankau en sia partopreno en la peso, almenau havas signifon, nome ke tio sumas 5% au pli. Tiujn specojn ni nomas potenciale gravaj. De ciuj specoj konsiderindaj por la karakterizado ni plue esploris, kiun frekventlimon ili devas atingi por esti alkalkulataj inter la potenciale gravaj specoj; tiu sumas normale 50%. El ci tiuj sufice frekventaj specoj, tiuj estas elektitaj por la karakterizado, kiuj lau praktika agronomia vidpunkto havas indikan valoron (nome indikante bonan, malbonan, au moderan herbmaton) kaj (au) estas uzeblaj indikiloj de ekologia vidpunkto. Ceftipoj estas distingitaj lau nur 1 tipa speco, tipoj lau 2 kaj subtipoj lau 3 tipaj specoj. La aldonita strukturskemo donas supervidon de la tiparo de preskau 400 esploritaj nesalaj nederlandaj herbejoj. La lasta parto de tiu ci artikolo priskribas la agronomian taksadon kaj la ekologion de la determinantoj de la ceftipoj kaj tipoj por klarigi ilian elekton. Tabelo de la herbeja tipdeterminado. En la horizontala vico supre estas notitaj specoj, kiuj kaze de sufica frekvento formas ceftipojn de la sama nomo. Ili estas numeritaj lauorde de antaueco, kiu krome estas montrita per sagoj. La vertikala vico maldekstre montras la specojn, kiuj ludas rolon ce la subdivido de la ceftipoj en tipoj. Ce la determinado de ilia antaueco ekzistas du kazoj. La unuan, indikitan per numeroj kaj sagoj maldekstre, oni renkontas, kiam unu el la ceftipoj 1–6 inkl. au 13–16 inkl. estas trovita; la alian kazon, indikitan per numeroj kaj sagoj dekstre, oni renkontas, kiam oni havas antau si unu el la ceftipoj 7–12 inkl. En la tabelo ni plenigis la tipojn de ni trovitajn, kune kun la nombro da fojoj, ke ili estas konstatitaj. En la horizontala vico malsupre oni trovas la nombron da parceloj de ciu ceftipo. La signifon de la uzitaj mallongigoj kun frekventlimoj inter parentezoj oni trovas sur p. 56.
    Notes: Summary First the method has been described upon which the characterization of the Dutch grasslands is based. The plant sociological specific frequency method guarantees a fair stability of the values, unlike the percentage productivity and percentage frequency method which often result in too great differences varying with the time at which the samples are taken. To ensure the agricultural value of the specific frequency method, the small size of 25 sq. cm has been chosen as sample area. Then we can be sufficiently sure that the most frequent species are also at least of importance in the percentage weight, that is to say, that they amount to 5% or more. We call these species potentially important. For all the species considered for characterization there has been investigated what frequency limit they will have to reach to be counted to the potentially important ones, this normally amounts to 50%. For characterization, species are chosen which are sufficiently frequent, their practical agricultural value being significant (indicating a good, bad or moderate sward), and (or) are useful indicators from the ecological point of view. Maintypes are distinguished according to one typical species, types according to two and sub-types according to three typical species. The following structure-scheme gives a survey of the characterization of nearly 400 examined non-briny Dutch grasslands. In the last part of the article a discussion is found about the agricultural valuation and ecology of the main-type- and typeformers and the reason for their choice.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of pest science 21 (1948), S. 133-133 
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Antonie van Leeuwenhoek 14 (1948), S. 29-32 
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Conclusions There is no doubt that during 1932 in the Netherlands the frequency of Weil's disease was really much higher than in the years before and thereafter. The peak can't be ascribed to the fact that Weil' disease in 1929 has been placed on the list of diseases with compulsary notification. In comparing the years 1932, 1933 and 1934 with 1945, 1946 and 1947, it appears that the morbidity has decreased much more in the provinces of South Holland and Utrecht than in the other parts of the country. The measures taken to diminish the contact with rat-urine only partly account for the decrease of the morbidity since 1932. A periodical investigation into the leptospira carrier rates of rats living in several parts of the Netherlands is desirable.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Antonie van Leeuwenhoek 14 (1948), S. 169-172 
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
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  • 10
    Electronic Resource
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    Springer
    Antonie van Leeuwenhoek 14 (1948), S. 153-160 
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Résumé Dans 4 familles où se trouvait un malade atteint de poliomyélite on a examiné les sérums de la phase aiguë et de la phase de convalescence des malades et des autres membres de famille pour chercher la présence d'anticorps neutralisant trois souches du virus poliomyélitique (Lansing, SK et MM) et le virus de la chorioméningite lymphocytaire. Dans deux familles au moins, les recherches indiquent que les anticorps contre la souche Lansing ne se forment que comme conséquence spécifique d'une infection, éventuellement asymptomatique, par un virus poliomyélitique d'une structure antigène apparentée à celle de la souche Lansing. Dans une famille le sérum de la phase aiguë d'un malade et le sérum de sa mère, contenaient des anticorps tandis que le sérum de son père et d'une soeur ne neutralisait pas la souche Lansing. Dix semaines après, les sérums du père et de la soeur avaient obtenu un pouvoir neutralisant contre cette souche, bien que ni l'un ni l'autre n'aient été malades. Ceci pourrait indiquer la possibilité d'une infection par contact direct dans la famille.
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