摘要:

As part of research on the interstitial fauna and benthic and periphytic rotifers in the River Adige, the rotifers in the central flow of the river were studied. The incidence is given of the species found. A comparison between these data and those from an analysis of benthicperiphytic rotifers suggests that, in this stretch of the river, rotifers occurring in the flow represent a component of the drift.

ISSN:0373-4137    

DOI:10.1080/11250008109439348

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Two species of Polychaetes new to the Mediterranean fauna are reported:Lumbrinereis inflata(Moore, 1911) andStreblosoma hessleiDay, 1955.

ISSN:0373-4137    

DOI:10.1080/11250008109439349

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Endocrine changes may modulate isolationinduced aggressiveness inMus musculus. Significant differences in the blood levels of T4, T3 and rT3 in males classified as dominant, submissive and reared in isolation have previously been obtained. Isolated mice appear homologous to socially dominant animals as far as aggressiveness is concerned. The endocrinological results support this hypothesis. In that experiment dominant and submissive males, after an open fight, lived together 4 days in a stable hierarchy of two, and were then sacrificed. To find out if levels of peripheral thyroid hormones in dominant and submissive males differ before fighting or depend on living together in a restricted environment of one dominant and one submissive male, the animals in the present experiment were immediately sacrificed after fighting. The results are different from the previous ones, demonstrating that the differences in endocrine functions previously observed are present only when the social hierarchy is stable.

ISSN:0373-4137    

DOI:10.1080/11250008109439350

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Nonspecific acid α-naphthyl esterase (ANAE) activity was tested in splenic white cells from thymectomized and sham-thymectomized larvae ofBufo bufoto individualize T-lymphocytes. By ANAE technique T-lymphocytes ofBufodisplay a characteristic red brown reaction (T-pattern) and are readily distinguished. Thymectomy was performed at two different larval stages. The total number of white cells for each spleen and the number of T-pattern cells per 100 spleen white cells were determined. In addition, the number of large T-pattern cells, characterized by large spots of ANAE activity, per 100 T-pattern cells was counted. The early thymectomzied larvae exhibited a lower total number of splenic white cells. The percentages of T-pattern cells were similar in all groups. The large T-pattern cell count was lower in the two thymectomized groups, and lowest of all in the early thymectomized.

ISSN:0373-4137    

DOI:10.1080/11250008109439351

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

L'occupation de l'espace à trois dimension par le desman des PyrénéesGalemys pyrenaicusInsectivora, Talpidae

ISSN:0373-4137    

DOI:10.1080/11250008109439352

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Thein vitroeffects of two carbamates, Eserine and Methomyl and two organophosphates, Dichlorvos and Malathion, on α and β esterases, at the three developmental stages ofChironomus htummi, were studied. The carbamates had a similar inhibitory effect, while the organophosphates acted quite differently: Dichlorvos was the stronger inhibitor, but Malathion was comparatively weak.

ISSN:0373-4137    

DOI:10.1080/11250008109439353

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0373-4137    

DOI:10.1080/11250008109439354

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The freshwater community structure, especially in the open waters, is not only the result of abiotic environment, but preeminently of biotic interactions, like predation and competition for resources. Many examples of catastrophes of greater or lesser extent are given, such events may occur, especially in immature ecosystems, following the disappearance of a species or the introduction of a new one. It is stressed that community structure modifies the abiotic environment.

ISSN:0373-4137    

DOI:10.1080/11250008109439355

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

After the latest discoveries on the peptides identified in the vertebrate hypothalamus and on the mechanisms of neuroendocrine regulations, the classical definition should be amended of the neurosecretory cell (as a neuron producing histologically detectable secretions acting via the blood stream and unable to make true synapses).

ISSN:0373-4137    

DOI:10.1080/11250008109439356

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

I PESCI DI SCIACCAdi Raffaele Di Milia (a cura di Pasquale Marchese), pp. 5–60, Tipografia Quartana, Sciacca, 1981, lire 3.000. Reviewed by Carlo Mozzi.

ISSN:0373-4137    

DOI:10.1080/11250008109439357

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor