摘要:

Systematic analysis of the distribution of Polychaetes on soft bottoms was carried out at depths ranging from 1,5 to 20 m along a tract of northern Lazio coast. 52 species were found and identified. A gradual change in the Polychaete communities was observed according to the sediment type and to the depth. The different grain-size and nature of the sediment influence the presence or the absence of some species in nearby areas. At a depth of 20 m some species become less frequent or disappear while other species which prefer soft bottoms at greater depth gradually appear there.

ISSN:0373-4137    

DOI:10.1080/11250007909440281

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

This paper reports on the food habits of nestling Rollers from an area of Central Italy. The chicks were fed on a large number of mainly hard-bodied beetles. Scarabaeoidea made up 60,5% of the prey, Cetoninae being the most represented group (42,6%) out of the total number of prey (N=129). AlsoPentodon punctatus(14%), Carabidae (11,6%) and Cicadidae (8,5%) were taken in fairly large numbers. We suggest that the Roller is a rather catholic, diurnal insectivore bird preferring medium- and largesized beetles. The strong bill of this Coraciid enables it to crack open the hard, chitinous exoskeletons of beetles such asMorimus asper, Oryctes nasicornis grypusand others. Its insectivore habits make this bird resent the use of pesticides and traditional forest management, which threaten directly and indirectly its survival, especially in such a delicate period as the breeding season.

ISSN:0373-4137    

DOI:10.1080/11250007909440282

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The percentage of the incorporation of tritiated leucine into nuclear proteins has been investigated at various stages of sea urchin development. The results indicate a non-coincidence in the requirement for histones and nonhistone proteins. The results are consistent with the hypothesis of a modulation of gene activity based on histone/non-histone interaction influencing the nature and the strength of the ionic histone to DNA binding. In addition, evidence is offered that newly synthesized messenger RNA's are richer in nuclear protein messengers than the maternal ones.

ISSN:0373-4137    

DOI:10.1080/11250007909440283

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Chromatin from blastulae and plutei ofParacentrotus lividuswas fractionated through a hydroxyapatite column. The ratio of histones versus non-histone proteins decreases from blastula to pluteus stage.

ISSN:0373-4137    

DOI:10.1080/11250007909440284

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Ablation of brain portions containing hypothalamic regions of two different extensions did not interfere with total radiothyroidectomy, but it did prevent the sequela of giantism by radiothyroidectomy. These results suggest the presence of a hypothalamic centre stimulating prolactin secretion.

ISSN:0373-4137    

DOI:10.1080/11250007909440285

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

To provide information on the distribution of Italian Drosophilids, collections were made with a standardized method at three sites in Northeast Italy (Veneto).

ISSN:0373-4137    

DOI:10.1080/11250007909440286

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The first results of a study on the occurrence of trace metals inDonaxare given here briefly.

ISSN:0373-4137    

DOI:10.1080/11250007909440287

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The effects of testosterone on the mesonephric collecting ducts ofTriturus italicushave been studied. During March and April these ducts hypertrophy naturally and secrete, but during the rest of the year their epithelium is regressed. Castration was followed by involution of the ducts so that the regression persisted. Testosterone given in massive doses to intact and gonadectomized animals in the regressed phase resulted in full secretion.

ISSN:0373-4137    

DOI:10.1080/11250007909440288

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

INTRODUZIONE ALLA BIOFISICAdi Stefano Massari, pp. 9–118. Ed. Cleup, Padova, 1979, L. 3.300. Reviewed by Pietro Omodeo.

ISSN:0373-4137    

DOI:10.1080/11250007909440289

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

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

ISSN:0373-4137    

DOI:10.1080/11250007909440270

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor