Teneur en eau et en azote chez l'abeille en fonction de l'isolement

Résumé La diffèrence de mortalité notée entre les abeilles isolées et groupées n'est pas due à une perturbation du métabolisme de l'eau et de l'azote. Ceci étant également vrai pour les surces, il est possible de généraliser et de dire que le métabolisme généraliser et de dire que le métabolisme général ne semble jouer aucun rôle déterminant dans cet effet de groupe, observé tant chez les abeilles d'hiver que chez les abeilles d'été.

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Zusammenfassung Die Sterblichkeitsdifferenz zwischen isolierten und gruppierten Winter- oder Sommerbienen ist nicht auf eine Perturbation des Metabolismus von Wasser und Stickstoff zurückzuführen, wie es ja auch bereits vom Zuckergehalt festgestellt wurde.Der Metabolismus spielt also keine entscheidende Rolle in diesem Gruppeneffekt.

     

Wederzijdse stereotypen van jongeren en ouderen en hun relatie met zelfbeeld en zelfwaardering

Mutual stereotypes of younger and older adults and their relation with self-concept and self-esteem In this study younger and older persons were compared with regard to their stereotypes about both age groups, their self-concept and self-esteem. We examined the relation between age and stereotypes about younger and older adults, the relation between stereotypes about one’s own age group and self-concepts, and the relation between self-concepts and self-esteem. Stereotypes and self-concepts were measured on two dimensions, warmth and competence. Twenty-eight younger adults (16-25 years) and 26 older adults (65-85 years) participated in this study. Both age groups perceived younger persons as more competent than older persons and older persons as more warm than younger persons. Older persons rate themselves higher than their in-group on competence and warmth. Younger respondents did the same, but on warmth only. A rating of the own person as more competent than the stereotype of their own age group, is related to self-esteem for older persons. Distancing oneself from negative stereotypes about one’s own age group is an important key in maintaining high levels of self-esteem, but only in old age.     

Cambios en la Diversidad en Siete Comunidades de Anuros en los Andes de Ecuador1

In the Ecuadorian Andes, populations of 24 anuran species have been reported to be in the process of decline or extinction since the late 1980s. In spite of these reports, quantitative data on population trends on anuran populations in Ecuador are scarce. We compare relative abundance and species composition in surveys conducted between 1967 and 1988 (initial surveys) with surveys conducted between March 2000 and November 2003 (recent surveys) in seven anuran communities in the Andes of Ecuador. A total of 76 anuran species was registered. In 88 populations corresponding to 73 species in seven localities, 56 of them decreased and 27 increased their relative abundances. We observed significant differences in the number of species present in the initial surveys with respect to recent surveys. In six out of seven localities we registered fewer species than previously, even though capture effort was greater in recent surveys. Differences were of higher magnitude for species with aquatic larvae (34 species in initial surveys and 17 in recent surveys). Differences were not significant for species with direct development (genus Eleutherodactylus; 28 species in initial and recent surveys). We registered increases in the upper limit of the altitudinal range for six species and nine new records for six localities.     

Het Tijdschrift voor Gerontologie en Geriatrie en de praktijk

In 2008 the Dutch-language journal of gerontology and geriatrics goes into its 39th year of publication. Most of the scientific papers published by the Journal in 2007 serve a practical purpose. The Journal is oriented towards the scientific community of Dutch speaking geriatricians, nursing home physicians, psychologists, sociologists and other scientific professionals. Besides theory-driven empirical studies in gerontology and geriatrics, the Journal publishes comments and criticism on government policy on geriatric care and services for the elderly.     

Neuromonitoreo no invasivo en unidades de cuidados intensivos en Colombia

Continuous non-invasive electroencephalographic monitoring is an essential technique for critical care patients as it shows directly and indirectly the patient’s brain activity and makes it possible to relate it with findings in the clinical status. It is highly sensitive, although its specificity is lower, so they can show alterations of the state of consciousness without clarifying the etiology.Continuous electroencephalographic recording in patients with altered levels of consciousness, seizures, and convulsive and non-convulsive status epilepticus has been increasing in recent years as real-time feedback of the cerebral function shows evolution changes and allows for the identification of electric and subclinical epileptic seizures that are highly important since they do not have clinical correlations.These findings in electroencephalographic monitoring also help to modify pharmacological and antiseizure treatments. For practitioners, they are advantageous when making timely decisions that impact the prognosis of the patient.     

Mutabiliteit en Variabiliteit

Ohne Zusammenfassung