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showing 10 items of 10618 documents
Discovery of slow X-ray pulsations in the high-mass X-ray binary 4U 2206+54
2008
Context. The source 4U 2206+54 is one of the most enigmatic high-mass X-ray binaries. In spite of intensive searches, X-ray pul- sations have not been detected in the time range 10−3–103 s. A cyclotron line at ∼30 keV has been suggested by various authors but never detected with significance. The stellar wind of the optical companion is abnormally slow. The orbital period, initially reported to be 9.6 days, disappeared and a new periodicity of 19.25 days emerged. Aims. The main objective of our RXTE monitoring of 4U 2206+54 is to study the X-ray orbital variability of the spectral and timing parameters. The new long and uninterrupted RXTE observations allow us to search for long (∼1 h) puls…
Gene expression patterns associated with caste and reproductive status in ants: worker-specific genes are more derived than queen-specific ones.
2013
Variation in gene expression leads to phenotypic diversity and plays a central role in caste differentiation of eusocial insect species. In social Hymenoptera, females with the same genetic background can develop into queens or workers, which are characterized by divergent morphologies, behaviours and lifespan. Moreover, many social insects exhibit behaviourally distinct worker castes, such as brood-tenders and foragers. Researchers have just started to explore which genes are differentially expressed to achieve this remarkable phenotypic plasticity. Although the queen is normally the only reproductive individual in the nest, following her removal, young brood-tending workers often develop …
Iniuria Migrandi: Criminalization of Immigrants and the Basic Principles of the Criminal Law
2013
In questo articolo mi propongo di effettuare una valutazione normativa, dal punto di vista di una teoria del diritto penale orientata secondo principi, delle norme che incriminano l'immigrazione irregolare. L'interrogativo generale sul quale mi soffermerò è questo: che modo di usare il diritto penale è implicato nella emanazione di simili norme? La mia tesi è, in sintesi, che si tratta di un vero e proprio abuso del diritto penale. In almeno due sensi: primo, nel senso che, criminalizzando l'immigrazione irregolare, il diritto penale bandisce (categorie di) persone, e non atti/omissioni, facendo qualcosa che un diritto penale rispettoso di alcuni principi liberali fondamentali non dovrebbe …
Association between genetic variations in the insulin/insulin-like growth factor (Igf-1) signaling pathway and longevity: a systematic review and met…
2013
Some studies have shown that polymorphisms in the insulin growth factor-1 (IGF-1) signaling pathway genes could influence human longevity. However, the results of different studies are often inconsistent. Our aim was to investigate by systematic review and meta-analysis the association of the common polymorphisms defining the genetic variability of the IGF-1 signaling pathway associated with human longevity. Eleven studies investigating the association between the polymorphisms in the IGF-1 signaling pathway genes (IGF-1, IGF-1 receptor (IGF-1R), Forkhead box O3A (FOXO3A) and Silent mating type Information Regulation 1 (SIRT1) and longevity were found and analyzed. The modelfree approach wa…
The relationship between vigilance capacity and physical exercise: a mixed-effects multistudy analysis
2019
We thank to all the participants who took part in the experiment.
Personality Type D, Level of Perceived Stress, Insomnia, and Depression Among High School Teachers in Poland
2021
Teaching is inherently connected with specific burdens that may imply stressful situations. Psychological predispositions of the surveyed group, including personality type D (distressed personality) and level of experienced stress can cause depressive episodes and sleep disorders, which have a direct impact not only on health in terms of disease, but also on well-being and the ability to effectively and properly teach. The research group consisted of 412 high school teachers from the Silesian Province, located in the south of Poland. Using the following research tools: Type D Scale (DS14), Perceived Stress Scale (PSS-10), Athens Insomnia Scale (AIS) and Beck Depression Inventory (BDI), it w…
Galvassāpju izplatība Latvijas Universitātes medicīnas studentu vidū
2022
Ievads: Galvassāpju traucējumi, galvenokārt primārie, tiek uzskatīti par nopietnām globālām veselības problēmām, kas izraisa ievērojamu invaliditātes slogu slimniekiem, lai arī paradoksālā kārtā, bieži tiek ignorēti un nenovērtēti. Cilvēki savos produktīvajos gados irvisvairāk skartā grupa, un to vidū ir arī studenti. Mērķis: Pētījuma mērķis bija apkopot Latvijas Universitātes medicīnas studentu galvassāpju epidemioloģiskos un klīniskos raksturojumus, lainoteiktu cefalģijas izplatību, novērtētu riska faktorus, provocējošos faktorus, galvassāpju ietekmi un to mazināšanu ar medikamentiem, kā arī noskaidrot iespējamos iemeslus, kādēļ pētāmā populācija izvairās no specializētas galvassāpju trau…
Data from: Reproductive isolation among allopatric Drosophila montana populations
2014
An outstanding goal in speciation research is to trace the mode and tempo of the evolution of barriers to gene flow. Such research benefits from studying incipient speciation, in which speciation between populations has not yet occurred but where multiple potential mechanisms of reproductive isolation (RI: i.e. premating, postmating-prezygotic (PMPZ), and postzygotic barriers) may act. We used such a system to investigate these barriers among allopatric populations of Drosophila montana. In all heteropopulation crosses we found premating (sexual) isolation which was either symmetric or asymmetric depending on the population pair compared. Postmating isolation was particularly strong in cros…
Data from: Multi-modal defenses in aphids offer redundant protection and increased costs likely impeding a protective mutualism
2018
1.The pea aphid, Acyrthosiphon pisum, maintains extreme variation in resistance to its most common parasitoid wasp enemy, Aphidius ervi, which is sourced from two known mechanisms: protective bacterial symbionts, most commonly Hamiltonella defensa, or endogenously encoded defenses. We have recently found that individual aphids may employ each defense individually, occasionally both defenses together, or neither. 2.In field populations, Hamiltonella-infected aphids are found at low to moderate frequencies and while less is known about the frequency of resistant genotypes, they show up less often than susceptible genotypes in field collections. To better understand these patterns, we sought t…
Data from: Extinction and recolonization of maritime Antarctica in the limpet Nacella concinna (Strebel, 1908) during the last glacial cycle: toward …
2013
Quaternary glaciations in Antarctica drastically modified geographical ranges and population sizes of marine benthic invertebrates and thus affected the amount and distribution of intraspecific genetic variation. Here, we present new genetic information in the Antarctic limpet Nacella concinna, a dominant Antarctic benthic species along shallow ice-free rocky ecosystems. We examined the patterns of genetic diversity and structure in this broadcast spawner along maritime Antarctica and from the peri-Antarctic island of South Georgia. Genetic analyses showed that N. concinna represents a single panmictic unit in maritime Antarctic. Low levels of genetic diversity characterized this population…