水生高等植物化感抑藻作用研究

本文从四类水生植物所产生的化感物质,以及化感抑制机制等方面对化感控藻技术进行了评述。研究发现环境因素,如光照,营养胁迫等会显著影响化感作用效果。     

Further observations on the mode of action of chloramphenicol on the chick morphogenesis

Zusammenfassung Acetylsalicylsäure,p-Hydroxybenzoesäure, 2-Methyl-1,4-Naphthachinon und Vitamin E heben die in einem Hühnerembryo durch Chloramphenicol bewirkte Hemmung der Morphogenese auf, währendp-Aminobenzoesäure undp-Aminosalicylsäure keinen Einfluss auf diese Hemmung haben.     

Whewell on the classification of the sciences

Despite deserving a place amongst the historic milestones of the philosophy of disciplines, the system of the sciences put forward by Whewell has so far received little interest. Yet his ideas had a significant impact on the researches subsequently carried out on the topic, exerting in particular a decisive influence on Peirce and Spencer. The present paper aims to display the innovatory nature of the philosophical foundations of the Whewellian classification of the sciences. In this respect, we will argue that the most striking feature of his disciplinary system lies in a heuristic categorization of the sciences according to their “methods of discovery”. This represents a double departure from both the Aristotelian and the Baconian disciplinary paradigms, which are instead underpinned by ontological and epistemological criteria, respectively. Next, we will explore the pivotal role of Whewell's classification of the sciences for his overall project of a philosophy of scientific discovery.     

Investigations on the influence of aminoacetonitrile on connective tissue in the hamster

Zusammenfassung Aminoazetonitril entfaltet eine deutliche Wirkung am Bindegewebe des Goldhamsters. Diese Wirkung äussert sich in einer Verminderung der Zugfestigkeit von Wundgewebe. Die Mastzellen zeigten keine morphologischen Änderungen. Sowohl die Anreicherung von Radioschwefel im Wundgewebe wie die Konzentrationen von Hydroxyprolin und Hexosamin im Aortengewebe änderten sich nicht in signifikanter Weise.

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Aided by grants from the Danish State Research Foundation, the Danish Rheumatism Association, and the Sigrid Juselius Stiftelse, Finland.     

Hypotheses on the phylogeny of the Salientia,based on karyological data

Riassunto Lo studio cariologico di specie di Anuri appartenenti alle famiglie più primitive dell'ordine conduce a formulare le seguenti ipotesi: (1) Ascaphidae e Discoglossidae sono strettamente collegati fra loro, e si differenziano da quasi tutti gli altri Anuri; (2) i Pipidae africani e quelli americani sono molto diversi fra loro; (3) i Pelobatidae hanno varie affinità cariologiche con i Leptodactylidae, e questi con gli Anuri superiori prevalentemente arciferi; (4) i Microhylidae hanno rapporti cariologici con i Ranidae.     

Further studies on the influence of chloride on the renal tubular reabsorption of bicarbonate in the dog

Résumé L'intensité de la dépression qu'entraîne l'hyperchlorémie sur la réabsorption tubulaire du bicarbonate chez le chien paraît être essentiellement déterminée par le niveau initial de la réabsorption du bicarbonate.     

Effect of acriflavin on the mitochondria of the rat

Resumen La administración de acriflavina provoca la aparición de un elevado número de mitocondrias con filamentos de ADN en el hígado, riñón y miocardio de la rata. Sobre la base de este hecho se sugiere que la acriflavina inhibe la reproducción del ADN mitocondrial, haciéndolo visible a nivel ultraestructural.     

Studies on the action of some enzymes on the cuticle ofFasciola hepatica L

Zusammenfassung Die Cuticula vonFasciola hepatica ist von proteinähnlicher Natur und von einem Saum aus Mucopolysacchariden oder Mucoproteiden umgeben. Sie enthält Glycogen und sudanophile, wohl lipidähnliche Substanzen.     

Further measurements on the bioluminescence of the seedlings

Riassunto Alcuni di noi recentemente hanno messo in evidenza un 'emissione di luce di debole intensità nello spettro visibile, da parte di semi in germinazione. E argomento del presente lavoro discutere alcune accurate misure di intensità luminosa condotte su semi germinanti e su loro estratti acquosi in varie condizioni di età della plantule da 1 a 20 giorni. Viene anche studiata la dipendenza dell'emissione luminosa dal pH della soluzione e viene indicata la distribuzione spettrale della luce emessa.     

Studies on the activity of phorbol myrystate acetate on the human polymorphonuclear leukocytes

Summary Phorbol myrystate acetate (PMA) activates nitroblue tetrazolium reduction in human polymorphs. The activation is inhibited by dibutyryl cyclic AMP, theophylline and phenylbutazone, but is not influenced by hydrocortisone in vitro, nor is it inhibited by leukocytes from patients treated with prednisone. Peptide analogues of Tuftsin also had no effect on this stimulatory activity. We conclude that the action of PMA on the nitroblue tetrazolium reduction is mediated through cyclic nucleotides.     

Preliminary report on the influence of the plasma upon the effect of ADP on arterial and venous platelets

Riassunto È stato dimostrato mediante prove crociate e la osservazione del comportamento di piastrine lavate risospese in PPP venoso o arterioso che la causa dell maggior risposta delle piastrine venose rispetto a quella delle piastrine arteriose all'ADP è nel plasma. La responsività all'ADP aumenta col tempo di incubazione nel plasma delle piastrine lavate.     

Critical comment on the ‘Trophic’ influence of the effector organ on the sympathetic nerves of the male sex accessories of the guinea-pig

Summary There is no absolute parallelism between organ noradrenaline content and organ weight in the male sex accessories during normal development or following regression after castration.