The influence of cobalt on the endoplasmatic reticulum of the horse bean (vicia faba l.).

The exogeneous application of cobalt induces the differentiation of membrane complexes of the endoplasmic reticulum. After longer acting of cobalt these membranes are dilated and later destroyed. This fact can manifest itself also in some disturbances of the cell division.     

Daunomycin-bands are similar to Q-bands on chromosomes of Vicia faba

Summary Lin et al. discovered fluorescent bands on human chromosomes stained with daunomycin (D-bands). These bands looked like Q-bands. We demonstrate D-bands, which look like respective Q-bands, in Vicia faba and infer that the similarity between D and Q banding is general.Acknowledgment. We are indebted to Mr G. Raziel for his help in photography and to Dr M. Friedländer.     

The effect of sulphydryl agents on the ioxynilinhibited cyclic photophosphorylation in chloroplasts ofVicia faba L

Zusammenfassung Es wurde die Rolle von Cystein und Glutathion als Schutzmittel für Enzym-Sulfhydrylgruppen studiert. Zyklische Photophosphorylierung, durch PMS katalysiert und durch Herbizid Ioxynil gehemmt, kann durch Zugabe von 10M Cystein oder Glutathion wieder teilweise bis ständig hergestellt werden. Es wird eine Hypothese aufgestellt, wonach der Hemmungsmechanismus auf einer Radikal-Reaktion beruhe.     

Does ammonium uptake influence xylem sap composition inPhaseolus vulgaris L. andGlycine max (L.) Merill?

The question of whether ammonium uptake influences the occurrence of ureides in legumes has been addressed in this study by investigating threeP. vulgaris genotypes as well as one cultivar ofGlycine max. All plants were raised in sand culture during the dry season in northern Thailand and irrigated daily with nitrogen-free nutrient solution, or the same solution containing 12 mol m^–3 nitrogen in the form of (NH₄)₂SO₄ or KNO₃, each treatment consisting of different proportions of either compound. Regression analyses of xylem sap composition relative to ammonium vs. nitrate supply of plants harvested at V4, R1 and R6 indicated close positive correlations of xylem amino nitrogen content and negative correlations with xylem nitrate content and ammonium supply. Statistically significant correlations between relative xylem ureide content and ammonium availability could be established for theP. vulgaris cultivar Brilliant up to stage R1, but not for the other plants investigated. It was concluded that at least for some genotypes of common bean a relationship exists between ureide production and ammonium uptake by the root system. Since the extent to which ureide production is stimulated remains quite small, its relevance to the xylem solute technique for measurement of N₂ fixation may be limited. Nevertheless, due to the possibility of large genotypic differences in the impact of ammonium on ureide production, this factor must be considered in calculations if N₂ fixation is to be determined in soils containing significant amounts of ammonium, e.g. in paddy fields.     

The influence of lichen extracts onVicia faba and Chinese Hamster cells

Zusammenfassung Der Einfluss verschiedener Wasserextrakte aus Flechten auf Chromosomenstruktur und Zellteilung an Bohnenwurzeln und Zellkulturen des chinesischen Hamsters wurde untersucht. Es kam zu keinen Chromosomenaberrationen. Einzig der Extract vonNephroma arcticum hatte in schwacher Konzentration einen hemmenden Einfluss auf den Mitoseverlauf. Diese mitosehemmende Wirkung könnte die Ursache sein, dassNephroma arcticum das Wachstum vieler holzzerstörender Pilze hemmt.     

The chromosomes of the great Indian rhinoceros (Rhinoceros unicornis L.)

Zusammenfassung Die Chromosomen des indischen Rhinozeros wurden untersucht. Es wurden 82 Chromosomen gefunden, die auch in ihrer Struktur den Chromosomen des afrikanischen Breitmaulnashorns ähnlich sind.

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Supported by a grant from the U.S. Public Health Service, No. GM 10210.     

Co-enzyme a content in the American cockroach (Periplaneta Americana L.) and the housefly (Musca domestica L.)

Riassunto Gli autori hanno dosato il CoA nei muscoli della coxa diPeriplaneta americana ed inMusca domestica in toto. Vengono messe in evidenza le differenze del contenuto in CoA dei muscoli bianchi e rossi della coxa di blatta. Viene inoltre messo in evidenza l'aumento progressivo del CoA, durante i primi 9 giorni di vita dell'adulto, inM. domestica.     

Release of nonspecific esterases from the roots ofVicia faba L

Summary Roots ofVicia faba L. immersed in a buffer solution were found to release esterases into the environment. The substrate -naphthylacetate was taken up by the roots and degraded, the hydrolysis products being released back into the surrounding medium.     

Incorporation of base analogues for detection of unusual base compositions in plant metaphase chromosomes (Vicia faba,Leguminosae)

Summary Bromodeoxyuridine and bromodeoxycytidine with fluorescence-plus-Giemsa staining resulted in similar patterns of asymmetric bands inVicia faba chromosomes. Limitations as to the use of methods for identification of A+T-and G+C-rich regions are discussed.Acknowledgements. We are grateful to Mr G. Versteegh. Groningen, for kindly providing us with a sample of BrdC and to Ms B. Hildebrandt for skilful technical assistance.     

The influence of different host plants on some biological aspects ofHeliothis armigera (Hub.)

Summary The suitability of 6 different plants as natural food forHeliothis armigera was tested. The different biological aspects ofH. armigera were taken in consideration. Kidney bean pods and cotton plant leaves were the most successful host plants tested as they increased the pupal weight and the reproductive potential of the resulting moths, followed by lettuce, which decreased the larval duration remarkably.     

The stimulus transmitting apparatus in the trichobothria of the bugsPyrrhocoris apterus L. andDysdercus intermedius (Dist.) and its influence on the dynamic of excitation in these sensilla

Correlations exist between ultrastructural characteristics in the stimulus-transmitting apparatus of the trichobothria on the 4th abdominal segment of the bugPyrrhocoris apterus (L.) and the functional characteristics of these sensilla.     

The choice of oviposition sites by the lady bird beetleAdalia bipunctata (L.)

Summary Adalia bipunctata females lay eggs on brussels sprout leaves in presence or absence of aphids, but the latter furnish an additional stimulus. The glass walls of the jar attracted the adults to lay eggs on it to some extent. Presence of cemented eggs did not hinder the oviposition of the adults on the brussels sprouts leaves.     

A pharmacological investigation of the influence of suxamethonium on cardiac function in the horse

Résumé Les auteurs étudient les différences quantitatives et qualitatives de l'effet du suxamethonium sur la fonction cardiaque chez des chevaux concients et des chevaux soumis à une anesthésie générale. Ils ont aussi contrôlé l'efficacité du propranolol, agent d'arrêt de transmission-adrénergique, empêchant tout changement dans les fonctions du cur.