Search results for "ASTER"
showing 10 items of 2223 documents
The orophilous communities of the Pino-Juniperetea class in the Central and Eastern Mediterranean area
2001
Orophilous plant communities of the Pino-Juniperetea class, occurring in the Central and Eastern Mediterranean area, are examined. This vegetation is characterized by the dominance of trees and shrubs, mostly represented by conifers belonging to the genera Juniperus, Abies and Pinus. These communities are nowadays relegated to the supra- and oromediterranean belt, and show a fragmentary distribution, which is an evident proof of their relict connotation. The comparison among these communities, based on original and literature data, has highlighted a remarkable floristic and structural homogeneity, together with a series of geographical vicariances. From the phytosociological point of view, …
Woc (without children) gene control of ecdysone biosynthesis in Drosophila melanogaster.
2001
Abstract The first step in ecdysteroidogenesis, i.e. the 7,8-dehydrogenation of dietary cholesterol (C) to 7-dehydrocholesterol (7dC), is blocked in Drosophila melanogaster homozygous woc (without children) third instar larval ring glands (source of ecdysone). Unlike ring glands from wild-type D. melanogaster larvae, glands from woc mutants cannot convert radiolabelled C or 25-hydroxycholesterol (25C) to 7dC or 7-dehydro-25-hydroxycholesterol (7d25C) in vitro, nor to ecdysone (E). Yet, when these same glands are incubated with synthetic tracer 7d25C, the rate of metabolism of this polar Δ5,7-sterol into E is identical to that observed with glands from comparably staged wild-type larvae. The…
Dinner with the roommates: trophic niche differentiation and competition in a mutualistic ant‐ant association
2020
1. The potential for competition is highest among species in close association. Despite net benefits for both parties, mutualisms can involve costs, including food competition. This might be true for the two neotropical ants Camponotus femoratus and Crematogaster levior, which share the same nest in a presumably mutualistic association (parabiosis). 2. While each nest involves one Crematogaster and one Camponotus partner, both taxa were recently found to comprise two cryptic species that show no partner preferences and seem ecologically similar. Since these cryptic species often occur in close sympatry, they might need to partition their niches to avoid competitive exclusion. 3. Here, we in…
Genecological and isozyme studies in Senecio vernalis Waldst. & Kit. and S. vulgaris L. var. vulgaris (Asteraceae) from Central Europe and Israel
1995
Summary Genecological evidence and evidence obtained from an isozyme survey suggest a considerable amount of intraspecific differentiation in Senecio vernalis . Plants of this species from Israel were found to differ strikingly from those of C European (German) origin in most of the traits investigated, e.g., in the possession of pronounced seed dormancy, which seems to be governed by a single gene, a shorter life cycle, lack of rosette growth correlated with stem elongation prior to budding, a larger number of smaller capitula with fewer (disc) florets, and an ephemeral habit with plants only flowering soon after the first winter rains. Both accessions achieved a similar reproductive poten…
Comprehensive Overview on Multiple Strategies Fighting COVID-19
2020
Lately, myriad of novel viruses have emerged causing epidemics such as SARS, MERS, and SARS-CoV-2, leading to high mortality rates worldwide. Thus, these viruses represented a challenging threat to mankind, especially considering the miniscule data available at our disposal regarding these novel viruses. The entire world established coordinative relations in research projects regarding drug and vaccine development on the external range, whereas on the internal range, all countries declared it an emergency case through imposing different restrictions related to their border control, large gatherings, school attendance, and most social activities. Pandemic combating plans prioritized all sect…
Argentina’s Economic Development and Life Satisfaction Revisited – 1984–2012
2014
At the end of 1983, Argentina returned to democracy. Between 1983 and 2012, Argentina brought better economic and development results as wells as an improvement in the levels of happiness and life satisfaction. Although the macroeconomic cycle was characterized by high volatility, the country GDP per capita was 74 % higher in 2012 compared to 1983, implying an average annual growth rate of 1.9 %, much higher than the average Latin American country. Poverty and income distribution as well as health and education ones notably improved after time intervals of decadence.
Regional Tourism Development in Romania – Consistency with Policies and Strategies Developed at EU Level
2013
Abstract The national tourism development master plan for the period 2007-2026 focuses on tourism resources of the regions. The regional tourism development strategy should have the opportunities and threats that are found in every county of the region as guide marks. Their identification leads to facilitate the implementation of tourism development strategy, the opportunity maximum use being the revival and growth ramp of tourist activities, preventing threats ensure the proper functioning of the implementation process. In this paper we analyzed a series of indicators of tourist movement in the eight development regions of Romania.
Re-Emerging Vaccine-Preventable Diseases in War-Affected Peoples of the Eastern Mediterranean Region—An Update
2017
For the past few decades, the Eastern Mediterranean Region has been one area of the world profoundly shaped by war and political instability. On-going conflict and destruction have left the region struggling with innumerable health concerns that have claimed the lives of many. Wars, and the chaos they leave behind, often provide the optimal conditions for the growth and re-emergence of communicable diseases. In this article, we will highlight three of the major re-emerging vaccine preventable diseases cholera, measles, and polio, in four countries of the Eastern Mediterranean Region that are currently affected by war leading to a migration crisis: Iraq, South Sudan, Syria, and Yemen. The re…
Sustainability Reporting in Central and Eastern European Companies: Results of an International and Empirical Study
2017
Reporting on corporate social, environmental and economic responsibility has broadened widely within the last decade. The European Union is the most active region in the world in terms of sustainability reporting, largely on a voluntary basis. Most of the empirical research related to sustainability reporting in Europe has been conducted in Western European countries. In Central and Eastern Europe, only a small number of studies have focused on sustainability reporting. Little, however, is known whether how and why companies in CEE report about their corporate sustainable activities. The aim of the research project is to describe the status quo of SR in CEE, to explain some noteworthy diffe…
Local social services in disaster management: Is there a Nordic model?
2017
Abstract The Nordic states have extensive welfare systems in which the local social services are an important component. Despite a growing research on disaster resilience, we lack research examining in systematic way whether and how local social services in the Nordic countries contribute to resilience. Aiming to fill this gap, this article asks whether we can identify a common Nordic model of the role of local social services in disasters, or whether the countries have taken different paths. We use policy documents and legislation to examine the extent to which roles for local social services are embedded in the disaster management systems of the five Nordic countries. We analyze the insti…