摘要:

Weak magnetic fields and germination in Triticum.—During previous experiments on germination and growth ofTriticum, carried out in our laboratory, several statistical differences among contemporary or little time distant replications have been found.

ISSN:0017-0070    

DOI:10.1080/11263507609426557

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Ultrastructural modifications of plastids in leaflets of Larix decidua and Picea excelsa during sprouting of buds.—Ultrastructural modifications of plastids in leaflets ofLarix deciduaandPicea excelsaduring sprouting of buds kept in different light conditions were observed.

ISSN:0017-0070    

DOI:10.1080/11263507609426558

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Vegetation of the rocky shore of north West Nurra.—After a brief introduction, the author describes the vegetation of the rocky shore of northwest Sardinia. It was possible to identify the following associations:Crithmo-Staticetum acutifoliaeMolinier 1955,Thymelaeo-HelichrysetumMolinier 1959,Centauretum horridaeMolinier 1955,Calycotomo-MyrtetumGuinochet 1944,Allietum chamaemolyMolinier 1959,Hyperrheinietum hirto-pubescentisBolos, Molinier, Montserrat 1970,Oleo-LentiscetumMolinier 1951,Oleo-Lentiscetum euphorbietosumMolinier 1954,Quercetum ilicisBr. Bl. (1915) 1936. Furthermore, some other consociations have been observed:Juniperus phoeniceaL., toGenista acanthocladaDC. andCalycotome villosa(Poir.) Link, toGenista corsicaDC. toRosmarinus officinalisL. andPistacia lentiscusL., toArbutus unedoL. andErica arboreaL., toBrachypodium ramosum(L.) R. et S. andLotus cytisoidesL. ssp.allioniiDesv., toDorycnium pentaphyllumScop. andTeucrium marumL.,Stachys glutinosaL., toFumana laevipes(L.) Spach andPhagnalon rupestreDC., toTuberaria guttata(L.) Four andBrachypodium distachyum(L.) P. B.

ISSN:0017-0070    

DOI:10.1080/11263507609426559

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Effect of 2,3,5-triiodobenzoic acid on the greening process in etiolated Euglena gracilis.—TIBA (2,3,5-triiodobenzoic acid), added to the cultures 3 or 24 h prior to illumination, inhibits cell division, chlorophyll synthesis and chloroplast development of etiolatedEuglena gracilis. Both in growing and resting conditions, the effects are particularly noticeable with the highest concentrations (100 and 150 ppm) of the chemical and with a preincubation in the dark for 24 h. Since growth inhibition precedes and is more remarkable than that of chlorophyll synthesis, an action of TIBA at the extraplastidial level is unquestionable. It is probable, however, that the compound also affects plastids both because resting cells are more sensitive than growing cells and because the effect on the chloroplast persists even when the normal division rate is resumed.

ISSN:0017-0070    

DOI:10.1080/11263507609426560

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Environment studies and summer typology of the phytoplankton and phytobenthos along the Tropea coast(Calabria).II.—In this work the results are related of a study on the sea environment and the planktonic and benthonic algae, which were collected along the coast between Capo Vaticano and Briatico (Calabria—Tyrrenian Sea). This study is the continuation of a previous research.

ISSN:0017-0070    

DOI:10.1080/11263507609426561

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Quercus calliprinos Webb and Quercus coccifera L.: researches on the leaf anatomy and taxonomical and chorological considerations.—In order to contribute to a systematic explanation of all forms attributed to contribute to a systematic explanation of all forms attributed to Kermes Oak, we have carried out a morphological and anatomic-micrometrical study on leaves of samples taken from different localities of its area. The characters observed in the samples permit us to distinguish two entities; one is located in Israel and is referred toQuercus calliprinosWebb, the other is located in France and is referred toQuercus cocciferaL. In some localities such as Apulia and Sicily, the two entities coexist; while in other localities the above differential characters of the samples appear oscillating; in this case it is not possible to attribute them to either entity. In all cases and above all in the most doubtful ones, we think that, in order to obtain a reliable systematic reference, the differential morphological characters, previously considered by the other authors, should be supported by anatomical-micrometrical characters which we have pointed out in this work.

ISSN:0017-0070    

DOI:10.1080/11263507609426562

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

New or interesting plants in the mountainous basin of the Esino (Marche region).—The Authors point out a discovery of 46 species of remarkable importance concerning the flora of the Marche region in the mountainous basin of the Esino. Among these,Poa chaixiandMonotropa hypopithishave been discovered in this region for the first time.

ISSN:0017-0070    

DOI:10.1080/11263507609426563

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Germination ecology of Althenia filiformis Petit in relation to the habitat temperature and salinity fluctuations during the summer and the autumn.—Germination ofAlthenia filiformisPetit (hydroalophyta) was analized at different phases of seed ripening in relation to the ecology of this species. Seeds were soaked in the dark, at 10°, 20°, 30°C, in deionized water and in NaCl solutions at 6.5‰ and 13‰ concentrations.

ISSN:0017-0070    

DOI:10.1080/11263507609426564

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Generation of electric potentials during flow of fluids in the xylem vessels (Preliminary Report).—The streaming potential generated by the flow of fluids in the xylem vessels has been studied on segments of stem ofCucurbita sechiumedule recently excised. The streaming potentials encountered in such experiments exhibit a much longer time constant than those observable in glass capillaries. The streaming potential so generated induces a superimposed rapid electric activity consisting of spikes. Finally, a peculiar relationship between the streaming potential and applied Δp has been encountered. Some tentative explanations of such results are suggested.

ISSN:0017-0070    

DOI:10.1080/11263507609426565

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

A contribution to the knowledge of Laboulbeniales (Ascomycetes) parasitic on Italian Carabids (Insecta, Coleoptera).—In the present paper two new species ofLaboulbenialesoccurring on Italian Carabids are described:Laboulbenia agelaeae, parasitic onAgelaea fulvaGené (Anchomeninae), andRhachomyces pacei, parasitic onSpeluncarius stephaniJurec. (Pterostichinae). Three other species, not yet reported for Italian flora, are also recorded:Corethromyces apotomi(Thaxt.),Dimeromyces leleupiBalazuc andLaboulbenia metabletiScheloske.

ISSN:0017-0070    

DOI:10.1080/11263507609426566

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor