摘要:

The purpose of this study is to analyse, by means of Scanning Electron Microscopy (SEM), the validity of the typification of the pollen ofCentaureaL. s.s., carried out by Wagenitz(1955) with light microscopy and based on the exine structure and sculpturing. The pollen of six species have been analyzed: one species for every type of pollen present in Italy:C. sempervirensL.,C. alpinaL.,C. scabiosaL.,C. albaL.,C. montanaL.,C. cyanusL.

ISSN:0017-0070    

DOI:10.1080/11263508209428066

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Of the14C labelled sugars (sucrose, glucose and fructose) and14C proline, the incorporation of label into different lipid types was least from proline while sucrose was the preferred precursor over glucose or fructose. High incorporation into phosphatidyl inositol with14C sucrose suggested that this phosphatide besides being a membrane component served possibly as the inositol storage component. High incorporation of label into phosphatidyl choline also suggested synthesis of new membranes during pollen tube growth.

ISSN:0017-0070    

DOI:10.1080/11263508209428067

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

A strong K+-dependent, fusicoccin-sensitive increase in acidic extrusion paralleled by a corresponding increase in net K+uptake and hyperpolarization of transmembrane electrical potential was observed in the root segments of wheat seedlings cultured in diluite CaSO4+0.27 mM Methyl-acethydroxamoilacetate. Moreover, K+-induced depolarization was also increased up to three times.

ISSN:0017-0070    

DOI:10.1080/11263508209428068

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Taxodioxylon gypsaceum(Göppert)Kräusel, wood fossil discovered in the central italian miocene.—A sample of silicified wood fossil has been discovered in the miocenic formations of the Castellaro mountain in the neighbourhood of Pesaro a city in Central Italy. An anatomical study has made it possible to accept that the species isTaxodioxylon gypsaceum, which resembles the actualSequoia sempervirensfor its woody structure, conservative endemism of a coastal region in California. The fossil species that is known for its numerous tertiary deposits in the Northern, Central and Eastern Europe, is now indicated for the first time in Italy; the mount Castellaro station results to be the more south among those in Europe.

ISSN:0017-0070    

DOI:10.1080/11263508209428069

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Soil microfungi in homogeneous areas of three plant communities of North Italy.—The soil microfungi associated with three different community types in Prealpine region of North Italy were investigated. Frequency values for the taxonomic entities isolated were calculated, based on occurrence at sampling sites, in each community. Most of the entities were quantitatively rare. The microfungal communities associated withAcer pseudoplatanusandFraxinus excelsior, withOstrya carpinifoliaand withFagus sylvaticaappeared to be a distinctive group, even if many of them contained a substantial number of species wich are common with other vegetation types.

ISSN:0017-0070    

DOI:10.1080/11263508209428070

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Aphyllophorales from Mesola Forest(Ferrara)Italy—The present check-list is the first contribution to the knowledge ofAphyllophoralesgrowing in the area of the Mesola Forest. The paper deals with 72 species ofAphyllophoralescollected during the years 1980-1983. A further contribution will complete the picture of theAphyllophoralesflora which is particularly interesting and abundant in the forest.

ISSN:0017-0070    

DOI:10.1080/11263508209428071

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The taxonomic attribution ofPorphyridiumNäg. toRhodophytais a question from a long time debated sincePorphyridiumlacks both the morphological and the reproductive features of the red algae.

ISSN:0017-0070    

DOI:10.1080/11263508209428072

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The toxic effects of 14 chemical elements (prevalently heavy metals) on the algaSpermatozopsis acidophilaKalina (Volvocales, Polyblepharidaceae) have been investigated.

ISSN:0017-0070    

DOI:10.1080/11263508209428073

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Some ultrastructural features of cells of the marine haptophycean alga,Ochrosphaera neapolitanaSchussnig in the palmelloid stage were examined. Chloroplasts which are contained in a compartment isolated from the cytoplasm by ER profiles and nuclear envelope, display trilamellated thylakoids running along the major axis. The stalked pyrenoid with inner bilamellated thylakoids, protrudes in a large membrane-bounded vacuole. Other structures, as the haptonematic and flagellar bases, autophagic vacuoles and mitochondria, are typical of the chrysophycean and haptophycean genera so far investigated.

ISSN:0017-0070    

DOI:10.1080/11263508209428074

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue

ISSN:0017-0070    

DOI:10.1080/11263508209428065

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor