Search results for " Migration"
showing 10 items of 754 documents
Migrating neuroblasts of the rostral migratory stream are putative targets for the action of nitric oxide
2007
It has been demonstrated that the gaseous messenger nitric oxide influences cell proliferation and cell migration, and therefore affects adult neurogenesis in mammals. Here, we investigated the putative targets for this action in the rostral migratory stream of the rat. We used immunocytochemical detection of the beta1 subunit of the enzyme soluble guanylyl cyclase, which can be activated by nitric oxide. Our results under light and electron microscopy demonstrated that the migrating neuroblasts (type A cells) were beta1-immunopositive. The astrocytes (type B cells), immature precursors (type C cells) and ependymal cells (type E cells) were beta1-immunonegative. The neurochemical characteri…
Impact of climate change on migratory birds: community reassembly versus adaptation
2007
Aim Species can respond to global climate change by range shifts or by phenotypic adaptation. At the community level, range shifts lead to a turnover of species, i.e. community reassembly. In contrast, phenotypic adaptation allows species to persist in situ , conserving community composition. So far, community reassembly and adaptation have mostly been studied separately. In nature, however, both processes take place simultaneously. In migratory birds, climate change has been shown to result in both exchange of species and adaptation of migratory behaviour. The aim of our study is to predict the impact of global climate change on migratory bird communities and to assess the extent to which …
Spatial genetic structure reveals migration directionality in Mediterranean Ruppia spiralis (Western Sicily)
2022
Mediterranean salinas, originally built for salt production, function as alternative wetlands. A variety of accompanying lagoon, ditch, and marsh systems are suitable habitats for salt-tolerant submerged macrophytes and often characterized by monospecific beds of Ruppia. Traditionally, birds are considered the main dispersal vector of submerged macrophytes. However, Ruppia spiralis habitats are under marine influence and therefore interference of coastal currents in their connectivity might be expected. In this study, we aim to infer connectivity and spatial patterns from population genetic structures. Using nuclear microsatellite loci, the nuclear ribosomal cistron and chloroplast sequence…
Capacity of Gentamicin-Treated Pseudomonas aeruginosa to Induce Granulocyte Locomotion
1982
In protection against an invading parasite the host’s granulocytes play an essential role. To exert their defense the phagocytes have to be attracted to the site of parasite invasion. We have shown that Pseudomonas aeruginosa ATCC 27853 and other clinical isolates of this species can induce granulocyte migration, either directly or via generation of chemotactic activity in serum [1].
Lymphknotendissektion, Stadienverschiebung und perioperatives Risiko beim Rectumcarcinom
1996
In der Klinik und Poliklinik fur Allgemeine und Abdominelle Chirurgie der Universitatskliniken Mainz wurde die Qualitat der Lymphknotendissektion, ihr Einflus auf das perioperative Risiko und das Tumorstaging bei 348 Patienten der Jahre 1985–1994 mit der Erstdiagnose eines Rectumcarcinoms im UICC-Stadium I–III und R0-Resektion des Tumors retrospektiv untersucht. Bei unveranderter pathohistologischer Aufarbeitungstechnik nahm die Anzahl der durchschnittlich pro Operation entfernten Lymphknoten sowohl bei den resezierenden Verfahren als auch bei den Exstirpationen von 5,3 bzw. 6 (1985/1986) auf 16,7 bzw. 17,3 (1991/1992) und 15,8 bzw. 17,3 (1993/1994) zu. Die Operationsmethode und die Erfahru…
Social factors as the catalyst of emigration
2022
The objective of the study is to address the factors contributing to emigration from Latvia, in particular by highlighting the importance of social factors in the emigration decision, using the theory of push and pull factors of migration as a theoretical basis. The role of the family and the desire to improve not only the economical, but also the social and psychological conditions of families are important factors in the decision-making process, while maintaining links with Latvia. The authors argue that social factors are essential to the migration decision alongside economic factors, and in particular the family situation. The family is a resource that helps to settle in the new country…
Organ-specificity and diagnostic value of cell-mediated immunity against a liver-specific membrane protein: Studies in hepatic and non-hepatic diseas…
1975
In chronic active hepatitis (CAH, n=58) 70% of the HBsAg negative and 48% of the HBsAg positive cases showed a CMI against human liver specific proteins (HLPI). Using HBsAg as antigen only 12% of the HBsAg negative and 24% of the HBsAg positive cases gave a CMI response. On the basis of HBsAg and autoantibodies in the serum CAH patients could be divided into 4 subgroups. A close correlation between CMI against HLPI, sex, ANA and HL-A-8 could be detected. In a follow-up study of patients with acute virus B hepatitis (n=62) CMI against HBsAg was detected in 60% of the cases in the acute phase of the disease but in 15% only 3-6 months after the onset of the illness (n=40). In patients who deve…
Ligation Tunes Protein Reactivity in an Ancient Haemoglobin: Kinetic Evidence for an Allosteric Mechanism in Methanosarcina acetivorans Protoglobin
2012
Abstract: Protoglobin from Methanosarcina acetivorans (MaPgb) is a dimeric globin with peculiar structural properties such as a completely buried haem and two orthogonal tunnels connecting the distal cavity to the solvent. CO binding to and dissociation from MaPgb occur through a biphasic kinetics. We show that the heterogenous kinetics arises from binding to (and dissociation from) two tertiary conformations in ligation-dependent equilibrium. Ligation favours the species with high binding rate (and low dissociation rate). The equilibrium is shifted towards the species with low binding (and high dissociation) rates for the unliganded molecules. A quantitative model is proposed to describe t…
Femminilizzazione dei flussi migratori, vulnerabilità di genere e diritto alla salute. Il caso degli accessi ai servizi sanitari dell’ARNAS Civico di…
2021
Salute, genere e migrazione sono temi di ricerca che difficilmente si armonizzano tra loro. L'articolo si concentra sul tema della migrazione evidenziando, attraverso la lettura dei dati Istat, il fenomeno del progressivo aumento della popolazione femminile migrante a Palermo. Esamina quindi, a livello empirico, le statistiche degli ultimi cinque anni relative all'accesso delle donne migranti agli ospedali di Palermo in relazione all'assistenza sanitaria prenatale (1), ai parto (2) e agli aborti (3). Si riferisce a un'ampia letteratura per descrivere il concetto di vulnerabilità e declinarlo in una prospettiva di genere che evidenzia la dimensione multipla di fattori contestuali, situaziona…
Health and the Process of Migration
2022
Chapter 5. Health and the Process of Migration