ISSN:0373-4137    

DOI:10.1080/11250005909439258

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

The coexistence of strictly related species in the same area, largely exhibited by Porifera of litoral zones, is here referred. Its ecological and evolutionary aspects are also discussed.

ISSN:0373-4137    

DOI:10.1080/11250005909439259

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

ISSN:0373-4137    

DOI:10.1080/11250005909439260

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

The ratio between bisexuality and parthenogenesis in 8 different populations of the EmbiidHaploembia solieriRamb, has been analysed.

ISSN:0373-4137    

DOI:10.1080/11250005909439261

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

The author demonstrates the existence in the Gulf of Cagliari of two different forms of the sexual state of the HydroidCampanularia caliculataHincks: one, as a free planetonic medusa (Agastra mira), the other as a medusoid or a sexil sporosac.

ISSN:0373-4137    

DOI:10.1080/11250005909439262

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

ISSN:0373-4137    

DOI:10.1080/11250005909439263

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

In the present work the Author has studied the nucleus of the collaterial glands in all the stages ofAcrida bicolor mediterraneaDirsh. In the larva, in the first instar nymph and in the young second instar nymph the number of the cells increases many times, and the mitoses occur frequently; then chromosome number is constantly diploid (2n = 24). Before the last moulting, and during the adult stage (before the glands begin to secrete) the number of the cells does not increase, hut the nuclei enlarge and become polyploid by repeated splitting of the chromosomes (endomitoses). The degree of polyploidy is in the young adult 4n, in the old adult 8n. This determination is rendered possible by counting the visible and separate chromosomes in the resting nucleus, and by the histophotometric investigation of the amount of DNA in Feugen-staincd cells.

ISSN:0373-4137    

DOI:10.1080/11250005909439264

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

In the present note the A. demonstrates, by means of some modern cytochemical technics, that in the collalerial glands ofAcrida bicolorThbg. occur acid phosphatase, succinodehydrogenase, peroxidase and dopa-oxidase. Such enzymatic systems are equally distributed in the two organs.

ISSN:0373-4137    

DOI:10.1080/11250005909439265

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Man hat einige enzymatische Aktivität in den Nauplius vonArtemia salinadi-und tetrahaploid sludiert und haben bestättigt dass einige Enzyme von den Polyploidismus beeinflusst sind während andere dasselhe Benehmen in den zwei Biotypen aufweisen.

ISSN:0373-4137    

DOI:10.1080/11250005909439266

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

L'activité enzymatique phenylphosphatasique acide et alcaline a eté etudié pendant la métamorphose duBufo vulgaris, soit dans l'animal entier que dans la queue en reabsorption. On a pu aussi voir que, a partir du stage I, les enzymes etudiés augmentent dans le deux cases.

ISSN:0373-4137    

DOI:10.1080/11250005909439267

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor