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Background
Suicide and non-fatal suicidal behaviour are significant public health issues in Europe requiring effective preventive interventions. However, the evidence for effective preventive strategies is scarce. The protocol of a European research project to develop an optimized evidence based program for suicide prevention is presented.
Method
The groundwork for this research has been established by a regional community based intervention for suicide prevention that focuses on improving awareness and care for depression performed within the European Alliance Against Depression (EAAD). The EAAD intervention consists of (1) training sessions and practice support for primary care physicians,(2) public relations activities and mass media campaigns, (3) training sessions for community facilitators who serve as gatekeepers for depressed and suicidal persons in the community and treatment and (4) outreach and support for high risk and self-help groups (e.g. helplines). The intervention has been shown to be effective in reducing suicidal behaviour in an earlier study, the Nuremberg Alliance Against Depression. In the context of the current research project described in this paper (OSPI-Europe) the EAAD model is enhanced by other evidence based interventions and implemented simultaneously and in standardised way in four regions in Ireland, Portugal, Hungary and Germany.
The enhanced intervention will be evaluated using a prospective controlled design with the primary outcomes being composite suicidal acts (fatal and non-fatal), and with intermediate outcomes being the effect of training programs, changes in public attitudes, guideline-consistent media reporting. In addition an analysis of the economic costs and consequences will be undertaken, while a process evaluation will monitor implementation of the interventions within the different regions with varying organisational and healthcare contexts.
Discussion
This multi-centre research seeks to overcome major challenges of field research in suicide prevention. It pools data from four European regions, considerably increasing the study sample, which will be close to one million. In addition, the study will gather important information concerning the potential to transfer this multilevel program to other health care systems. The results of this research will provide a basis for developing an evidence-based, efficient concept for suicide prevention for EU-member states.
The scope of this work is to develop a novel single-molecule imaging technique by combining atomic force microscopy (AFM) and optical fluorescence microscopy. The technique is used for characterizing the structural properties of multi-protein complexes. The high-resolution fluorescence microscopy and AFM are combined (FIONA-AFM) to allow for the identification of individual proteins in such complexes. This is achieved by labeling single proteins with fluorescent dyes and determining the positions of these fluorophores with high precision in an optical image. The same area of the sample is subsequently scanned by AFM. Finally, the two images are aligned and the positions of the fluorophores are displayed on top of the topographical data. Using quantum dots as fiducial markers in addition to fluorescently labeled proteins, fluorescence and AFM information can be aligned with an accuracy better than 10 nm, which is sufficient to identify single fluorescently labeled proteins in most multi-protein complexes. The limitations of localization precision and accuracy in fluorescence and AFM images are investigated, including their effects on the overall registration accuracy of FIONA-AFM hybrid images. This combination of the two complementary techniques opens a wide spectrum of possible applications to the study of protein interactions, because AFM can yield high resolution (5–10 nm) information about the conformational properties of multi-protein complexes while the fluorescence can indicate spatial relationships of the proteins within the complexes. Additionally, computer simulations are performed in order to validate the accuracy of the registration algorithm.
Platelet activation induces cytoskeletal rearrangements involving a change from discoid to spheric shape, secretion, and eventually adhesion and spreading on immobilized ligands. Small GTPases of the Rho family, such as Rac1 and Cdc42, are known to be involved in these processes by facilitating the formation of lamellipodia and filopodia, respectively. This thesis focuses on the role Rac1 and Cdc42 for platelet function and formation from their precursor cells, the megakaryocytes (MKs), using conditional knock-out mice. In the first part of the work, the involvement of Rac1 in the activation of the enzyme phospholipase (PL) C2 in the signaling pathway of the major platelet collagen receptor glycoprotein (GP) VI was investigated. It was found that Rac1 is essential for PLC2 activation independently of tyrosine phosphorylation of the enzyme, resulting in a specific platelet activation defect downstream of GPVI, whereas signaling of other activating receptors remains unaffected. Since Rac1-deficient mice were protected from arterial thrombosis in two different in vivo models, the GTPase might serve as a potential target for the development of new drugs for the treatment and prophylaxis of cardio- and cerebrovascular diseases. The second part of the thesis deals with the first characterization of MK- and platelet-specific Cdc42 knock-out mice. Cdc42-deficient mice displayed mild thrombo-cytopenia and platelet production from mutant MKs was markedly reduced. Unexpectedly, Cdc42-deficient platelets showed increased granule content and release upon activation, leading to accelerated thrombus formation in vitro and in vivo. Furthermore, Cdc42 was not generally required for filopodia formation upon platelet activation. Thus, these results indicate that Cdc42, unlike Rac1, is involved in multiple signaling pathways essential for proper platelet formation and function. Finally, the outcome of combined deletion of Rac1 and Cdc42 was studied. In contrast to single deficiency of either GTPase, platelet production from double-deficient MKs was virtually abrogated, resulting in dramatic macrothrombocytopenia in the animals. Formed platelets were largely non-functional leading to a severe hemostatic defect and defective thrombus formation in double-deficient mice in vivo. These results demonstrate for the first time a functional redundancy of Rac1 and Cdc42 in the hematopoietic system.
Plants must respond to multiple stimuli in a natural environment. Therefore they need the ability to rapidly reorganise and specifically build up appropriate metabolites to adapt to their environment. Abiotic cues, such as ambient solar radiation, influence the next trophic level directly, but also an altered plant composition triggered by these environmental cues can have an effect on the behaviour of herbivores. The aim of this study was to test effects of the important ultraviolet (UV) radiation on plants and on plant-insect interactions using multi-level investigations. The focus was on the conduction of controlled experiments with broccoli plants in highly engineered greenhouses covered with innovative materials, which only differed in their UV-B transmission. For the first time in this controlled environment the plant-mediated UV-B effects on phloem-feeding aphids were studied. Broccoli plants (Brassica oleracea L. convar. botrytis, Brassicaceae) were under filter tents either exposed to (inclusion, +UV) or not exposed to (exclusion, -UV) UV-A / UV-B radiation. In greenhouses covered with new, innovative materials transmitting high (80%), medium (23%) or low (4%) levels of ambient solar UV-B radiation, in particular the influence of UV-B radiation on broccoli was examined. Plants respond highly specific to environmental stimuli such as UV-B radiation and herbivory. UV-B radiation has a strong impact on the plants’ architecture and flavonoid contents, which can in turn influence plant-insect interactions. Phloem-feeding aphids can be negatively affected by UV-B mediated plant changes. However, a direct effect of UV radiation on the behaviour of herbivores is also evident. Mainly the number, composition and quality of herbivorous species as well as an exceeding of a certain infestation threshold determine the mode of plant changes. In conclusion, UV-B radiation has the potential to harden plants against herbivores and simultaneously increases the concentrations of valuable secondary metabolites for human nutrition in important crop species such as broccoli.
In conclusion, the present thesis demonstrates that the highly desired J-type aggregation of functional perylene bisimide chromophores can be achieved by proper design of monomeric building blocks that direct self-assemble by mutual effects of hydrogen bonding and pi-pi interaction, and on the other hand, are prevented to assemble in columnar stacks owing to their twisted pi-conjugated core and sterically demanding substituents. Furthermore, the self-assembly studies gave new insights into the dynamic aggregation process of low-dimensional extended assemblies with strongly excitonically coupled chromophores. The relationship between commonly known cyanine dye aggregates like that of THIATS and that of the present PBI 1a was investigated by absorption and fluorescence spectroscopy at low temperatures down to 5 K. The formerly unprecedented functional properties of PBI aggregates that are expressed in J-type excitonic coupling hold promise for application in optoelectronic and photovoltaic devices.
Phytohormones are known for their pivotal roles in promoting normal growth and development of the plants and contributing to the mechanism of defense. Although an over simplification, however, they may be categorized as stress specific and growth promoting. SA and JA/Ethylene are implicated in stress responses while auxins, cytokinins and gibberellins are involved in developmental processes. Phytohormones from the above perspective got much attention in the last few decades; however their reciprocal role is currently in focus. It is because of the reason that plant pathogens cause overall hormonal imbalance at host pathogen interface and alter host physiology for the sake of pathogenecity. Despite their importance in growth and development, cytokinins are among the most neglected phytohormones that are usually noticed as consequence rather than a cause of pathogen infection. Results presented in this thesis are based on the hypothesis that elevated levels of CKs embody plants with resistance against hemibiotrophic pathogens. To explore a connection between the spread of P. syringae and its tobacco host, CKs over producing transgenic plants were investigated whereby bacterial IPT gene was expressed under the control of pathogen inducible, tetracycline inducible and developmentally inducible promoters. To further validate the out-come of transgenic plants, various types of cytokinins were exogenously fed to detached tobacco leaves. Mentioned transgenics and exogenous CKs feeding approaches unanimously resulted in, “more cytokinins less disease symptoms” and vice versa. This state of cytokinins mediated resistance was further substantiated with various cellular, signaling, biochemical and microbial approaches wherein levels of SA and JA remained unaffected. Conversely, PR1 gene expression was strongly up-regulated in enhanced cytokinins accumulating samples. Moreover, less accumulation of ROS was observed in IPT expressing sites of the plants as compared to their corresponding controls. Additionally, we neither noticed any direct effect of cytokinins on the growth of P. syringae pv. tabaci nor found presence of anti-microbial peptides in cytokinins enriched extracts. Interestingly, enhanced accumulation of phtyoalexins in elevated CKs status of the plant proved to be a possible gesture in jeopardizing the spread of pathogen. Contrarily, no reduction was observed in the spread of fungal necrotrophic pathogen Sclerotinia sclerotiorum when leaves of elevated CKs were inoculated. Besides host-pathogen interaction in perspective of elevated cytokinins, impact of modulated sugar status of the plant on the spread of pathogen was also investigated. For this purpose, previously generated modulated invertase enzyme tobacco transgenic plants were analyzed. We showed that repression and de-repression of CIN1 gene under the control of tetracycline inducible-promoter did not affect the growth of P. syrinage pv. tabaci in Tet::CIN1 transgenic plants. Moreover, invertase inhibitor tobacco lines expressing NtCIF gene under the control of the same promoter failed to exhibit differential pathogenic responses in induced and non induced status of the plant. Similar was the case of tomato transgenic plants expressing NtCIF gene under the control of invertase gene Lin6 promoter in Lin6:: NtCIF plants for P.syringae pv. tomato DC 3000. Interestingly, when challenged Lin6:: NtCIF tomato plants with Botrytis cinerea, severe disease symptoms were observed on transgenic leaves as compared to control plants. To dissect a potential link between cytokinins and sugar metabolism with its effect on the growth of pathogen, invertase transgenic plants with elevated CKs were probed. When expressed exogenous IPT gene under the control of pathogen inducible promoter (4xJERE::IPT) in transgenic background of Tet::CIN1, we observed localized differences in symptom development for P.syringae pv. tabaci. Similarly, when exogenously fed with kinetin, detached leaves of Tet::CIN1 exhibited retarded growth of P.syringae pv. tabaci as compared to the tetracycline induced leaves. These results led to the conclusion that extracellular invertase may not play an essential role in cytokinins mediated disease resistance against hemibiotrophic pathogens.
We consider competitive location problems where two competing providers place their facilities sequentially and users can decide between the competitors. We assume that both competitors act non-cooperatively and aim at maximizing their own benefits. We investigate the complexity and approximability of such problems on graphs, in particular on simple graph classes such as trees and paths. We also develop fast algorithms for single competitive location problems where each provider places a single facilty. Voting location, in contrast, aims at identifying locations that meet social criteria. The provider wants to satisfy the users (customers) of the facility to be opened. In general, there is no location that is favored by all users. Therefore, a satisfactory compromise has to be found. To this end, criteria arising from voting theory are considered. The solution of the location problem is understood as the winner of a virtual election among the users of the facilities, in which the potential locations play the role of the candidates and the users represent the voters. Competitive and voting location problems turn out to be closely related.
Abstract: 1. The response of dispersal towards evolution largely depends on its heritability for which upper limits are determined by the trait's repeatability. 2. In the Linyphiid spider E. atra, we were able to separate long- and short-distance dispersal behaviours (respectively ballooning and rappelling) under laboratory conditions. By performing repeated behavioural trials for females, we show that average dispersal trait values decrease with increasing testing days. By comparing mated and unmated individuals during two periods (before and after mating for the mated group, and the same two periods for the unmated group), we show that mating has no effect on the mean displayed dispersal behaviour or its within-individual variation. Repeatabilities were high and consistent for ballooning motivation, but not for rappelling. 3. Ballooning motivation can be regarded as highly individual-specific behaviour, while general pre-dispersal and rappelling behaviours showed more individual variation. Such difference in repeatability between long-and short-distance dispersal suggests that short-and long-distance dispersal events are triggered by different ecological and evolutionary mechanisms.
This study presents new petrological results obtained from high-grade metamorphic rocks of the Beit Bridge, Mahalapye and Phikwe Complexes, which constitute the Central Zone of the Limpopo Belt in southern Africa. These results provide detailed information about the prograde and retrograde pressure-temperature (P-T) evolution of the three investigated complexes and, in concert with geochronological data, form the basis for the development of a coherent geodynamic model for the evolution of the Limpopo’s Central Zone. The P-T paths were inferred by the thorough investigation of silica-saturated and silica- undersaturated metapelitic and metabasic rocks, comprising six sillimanite-garnet-cordierite gneisses, four (garnet)-biotite-plagioclase gneisses, two garnet-orthopyroxene-biotite-Kfeldspar-plagioclase gneisses, one garnet- cordierite-orthoamphibole fels, one garnet-biotite amphibolite, and one garnet-clinopyroxene amphibolite. P-T points and P-T evolutions were derived by the application of conventional geothermobarometers, and quantitative phase diagrams in the systems Na2O - CaO - K2O - FeO - MgO - Al2O3 - SiO2 - H2O - TiO2 - O (NCKFMASHTiO), and MnO - TiO2 - Na2O - CaO - K2O - FeO - MgO - Al2O3 - SiO2 - H2O (MnTiNCKFMASH) - using the computer software THERMOCALC and THERIAK-DOMINO. The petrological information, in particular those obtained by comparison between observed and thermodynamically calculated mineral assemblages, zonations and modes, in combination with new and existing geochronological data provide evidence that rocks from the three investigated complexes underwent slightly different P-T evolutions at different times. The samples from the Bulai Pluton area (Beit Bridge Complex) provide evidence for a Neoarchean high-grade metamorphic event at ~2.64 Ga (M2), with peak P-T conditions of ~850°C at 8-9 kbar, and a decompression-cooling path to ~750°C at 5-6 kbar. This metamorphic evolution perhaps took place in a magmatic arc setting. In contrast, samples from the Mahalapye and Phikwe Complex document a Palaeoproterozoic event at ~2.03-2.05 Ga (M3), and were subject to different styles of prograde metamorphism. Metamorphic rocks from the Mahalapye Complex experienced a high-temperature low-pressure (HT-LP) metamorphic overprint, accompanied by the emplacement of voluminous granite bodies between 2.06 and 2.02 Ga, and provide evidence for a slightly prograde decompression from ~650°C/7 kbar to ~800°C/5.5 kbar. In contrast, the metamorphic rocks from the Phikwe Complex provide evidence for a simultaneous pressure and temperature increase from ~600°C/6 kbar to ~750°C/8 kbar, in the absence of significant Palaeoproterozoic magmatism. The HT-LP metamorphic evolution of the Mahalapye Complex is interpreted to be initiated by the underplating of hot mafic melts, either formed in response to SE-subduction during the Kheis-Magondi orogeny, and/or by contemporaneous mantle plume activities related to the formation of the Bushveld Complex. In contrast, the prograde pressure and temperature increase reflected by the rocks from the Phikwe Complex rather reflects successive crustal stacking at ~2.03 Ga. This stacking, which is also reported from many other units throughout the Limpopo Belt, is interpreted to result from the final convergence between the Kaapvaal and Zimbabwe Cratons, perhaps caused by SE-directed compression in response to the Kheis-Magondi orogeny between ~2.06 and 1.90 Ga.
Abstract: Inbreeding depression, asymmetries in costs or benefits of dispersal, and the mating system have been identified as potential factors underlying the evolution of sex-biased dispersal. We use individual-based simulations to explore how the mating system and demographic stochasticity influence the evolution of sex-specific dispersal in a metapopulation with females competing over breeding sites, and males over mating opportunities. Comparison of simulation results for random mating with those for a harem system (locally, a single male sires all offspring) reveal that even extreme variance in local male reproductive success (extreme male competition) does not induce male-biased dispersal. The latter evolves if the between-parch variance in reproductive success is larger for males than females. This can emerge due to demographic stochasticity if the habitat patches are small. More generally, members of a group of individuals experiencing higher spatio-temporal variance in fitness expectations may evolve to disperse with greater probability than others.