Testosterone causes both prosocial and antisocial status-enhancing behaviors in human males

Although popular discussion of testosterone’s influence on males often centers on aggression and antisocial behavior, contemporary theorists have proposed that it instead enhances behaviors involved in obtaining and maintaining a high social status. Two central distinguishing but untested predictions of this theory are that testosterone selectively increases status-relevant aggressive behaviors, such as responses to provocation, but that it also promotes nonaggressive behaviors, such as generosity toward others, when they are appropriate for increasing status. Here, we tested these hypotheses in healthy young males by injecting testosterone enanthate or a placebo in a double-blind, between-subjects, randomized design (n = 40). Participants played a version of the Ultimatum Game that was modified so that, having accepted or rejected an offer from the proposer, participants then had the opportunity to punish or reward the proposer at a proportionate cost to themselves. We found that participants treated with testosterone were more likely to punish the proposer and that higher testosterone levels were specifically associated with increased punishment of proposers who made unfair offers, indicating that testosterone indeed potentiates aggressive responses to provocation. Furthermore, when participants administered testosterone received large offers, they were more likely to reward the proposer and also chose rewards of greater magnitude. This increased generosity in the absence of provocation indicates that testosterone can also cause prosocial behaviors that are appropriate for increasing status. These findings are inconsistent with a simple relationship between testosterone and aggression and provide causal evidence for a more complex role for testosterone in driving status-enhancing behaviors in males

From pre- to young Planetary Nebulae: radio continuum variability

Searching for variability, we have observed a sample of hot post-AGB stars and young Planetary Nebulae candidates with the Very Large Array at 4.8, 8.4, and 22.4 GHz. The sources had been previously detected in the radio continuum, which is a proof that the central stars have started ionising their circumstellar envelopes and an increase in radio flux with time can be expected as a result of the progression of the ionisation front. Such a behaviour has been found in IRAS 18062+2410, whose radio modelling has allowed us to determine that its ionised mass has increased from 10^{-4} to 3.3 10^{-4} M_sun in 8 years and its envelope has become optically thin at lower frequencies. Different temporal behaviours have been found for three other sources. IRAS 17423-1755 has shown a possibly periodic pattern and an inversion of its radio spectral index, as expected from a varying stellar wind. We estimate that the radio flux arises from a very compact region around the central star (10^{15} cm) with an electron density of 2 10^6 cm^{-3}. IRAS 22568+6141 and 17516-2525 have decreased their radio flux densities of about 10% per year over 4 years. While a linear increase of the flux density with time points out to the progression of the ionisation front in the envelope, decreases as well as quasi-periodic patterns may indicate the presence of unstable stellar winds/jets or thick dusty envelopes absorbing ionising photons.Comment: 9 pages, 5 figures, accepted for publication on MNRA

New 6cm and 11cm observations of the supernova remnant CTA 1

(Abridged) We conducted new 6cm and 11cm observations of CTA 1 using the Urumqi 25-m and Effelsberg 100-m telescopes. Data at other wavelengths were included to investigate the spectrum and polarisation properties. We obtained new total intensity and polarisation maps at 6cm and 11cm with angular resolutions of 9.5 arcmin and 4.4 arcmin, respectively. We derived a spectral index of alpha=-0.63+/-0.05 based on the integrated flux densities at 408 MHz, 1420 MHz, 2639 MHz, and 4800 MHz. The spectral index map calculated from data at the four frequencies shows a clear steepening of the spectrum from the strong shell emission towards the north-western breakout region with weak diffuse emission. The decrease of the spectral index is up to about 0.3. The RM map derived from polarisation data at 6cm and 11cm shows a sharp transition between positive RMs in the north-eastern and negative RMs in the south-western part of the SNR. We note a corresponding RM pattern of extragalactic sources and propose the existence of a large-diameter Faraday screen in front of CTA 1, which covers the north-eastern part of the SNR. The RM of the Faraday screen is estimated to be about +45 rad/m2. A RM structure function of CTA 1 indicates a very regular magnetic field within the Faraday screen, which is larger than about 2.7 microG in case of 500 pc distance.Comment: 9 pages, 12 figures, minor changes, accepted for publication in A&

Slaktywizm – iluzoryczna aktywność czy realne działanie?

Rozwój nowych technologii na przełomie XX i XXI w. doprowadził do znacznej wirtualizacji codziennego życia. Młodzi ludzie coraz częściej postrzegają nowe media jako przestrzeń do kreowania własnej tożsamości, a także jako źródło poznania wirtualnych znajomych. Slaktywizm, który przez większość badaczy określany jest mianem pejoratywnego zjawiska, w obecnej rzeczywistości wykorzystywany jest także do propagowania różnych wydarzeń czy kampanii społecznych. Głównym celem niniejszego artykułu jest odpowiedź na pytanie, czy bierny aktywizm stanowi tylko iluzoryczną aktywność młodych ludzi, czy wręcz przeciwnie, może prowadzić do większego zaangażowania w realnym życiu

Female fertility and pregnancy in autoimmune Addison’s disease – a mini review

Autoimmune Addison’s Disease (AAD) is by far the most common cause of primary adrenal insufficiency in developed countries, occurring more commonly in women compared with men. The condition is associated with a spectrum of disorders affecting fertility and reproductive health. Premature ovarian insufficiency (POI) is a clinical condition defined by cessation of menstrual cycles and menopausal range gonadotrophins before the age of 40 years. This occurs with a prevalence of 1-2% in the general population, but has been estimated at 6-10% for women with AAD. One registry study demonstrated that one-third of those with AAD who develop POI, do so before the age of thirty. The onset of POI precedes or is contemporaneous with the diagnosis of AAD in the majority. It has also been demonstrated that women with AAD are more likely to use hormone replacement therapy. The pathophysiology of POI in this cohort is thought to be primarily through autoimmune mediated inflammation of the ovarian theca cells. In particular, cross-reacting autoantibodies to steroid-producing cells (StCA) have been identified which are present in AAD and POI. That said, when women with POI are excluded, fertility remains significantly reduced. Impaired adrenal androgenesis and resulting sex-hormone deficiency have also been implicated in subfertility in AAD. These lead to suboptimal follicular development. This, in turn, may also affect libido. Despite physiological glucocorticoid replacement therapy, patients with AAD consistently report reduced quality of life compared to matched controls. These factors may affect fecundity and likelihood of conception. Other autoimmune conditions such as hypothyroidism and type 1 diabetes occur with increased prevalence in those with AAD. These conditions have been shown to independently affect reproductive health. This review focuses on the current understanding of the factors and mechanisms impacting fertility in women with autoimmune Addison’s disease

Survey of Planetary Nebulae at 30 GHz with OCRA-p

We report the results of a survey of 442 planetary nebulae at 30 GHz. The purpose of the survey is to develop a list of planetary nebulae as calibration sources which could be used for high frequency calibration in future. For 41 PNe with sufficient data, we test the emission mechanisms in order to evaluate whether or not spinning dust plays an important role in their spectra at 30 GHz. The 30-GHz data were obtained with a twin-beam differencing radiometer, OCRA-p, which is in operation on the Torun 32-m telescope. Sources were scanned both in right ascension and declination. We estimated flux densities at 30 GHz using a free-free emission model and compared it with our data. The primary result is a catalogue containing the flux densities of 93 planetary nebulae at 30 GHz. Sources with sufficient data were compared with a spectral model of free-free emission. The model shows that free-free emission can generally explain the observed flux densities at 30 GHz thus no other emission mechanism is needed to account for the high frequency spectra.Comment: 10 pages, 7 Postscript figures, to be published in A&

Internetowa aktywność młodych dorosłych – raport z badań empirycznych

Artykuł prezentuje wyniki badań empirycznych dotyczące aktywności internetowej młodych dorosłych. Nowe technologie komunikacyjne i informacyjne mają wpływ na niemal każdą płaszczyznę życia. Młodzi dorośli już od najmłodszych lat mieli styczność z cyberprzestrzenią, co oznacza, że w odróżnieniu od starszego pokolenia internet jest dla nich naturalnym środowiskiem życia. Głównym celem analizy zebranego materiału empirycznego było wskazanie poziomu aktywności ankietowanych w internecie. Niniejszy artykuł jest próbą zbadania relacji, jakie zachodzą pomiędzy aktywnością respondentów w przestrzeni wirtualnej a ich cechami społeczno-demograficznymi (wiek, płeć, poziom wykształcenia, miejsce zamieszkania), ilością czasu spędzanego w internecie, zainteresowaniem polityką, poglądami politycznymi oraz udziałem w wyborach parlamentarnych. Hipotezą badawczą jest założenie, że młodzi dorośli charakteryzują się niskim poziomem internetowej aktywności. Wyniki badań potwierdzają hipotezę i wykazują, że ankietowani cechowali się niskim poziomem aktywności internetowej. Ponadto dostrzeżono korelacje pomiędzy czasem spędzanym w internecie, zainteresowaniem polityką, poglądami politycznymi oraz udziałem w wyborach parlamentarnych. Badana grupa deklarująca, że korzysta z sieci ponad cztery godziny dziennie, umiejąca określić własne poglądy polityczne, uczestnicząca w wyborach, a także wskazująca, że ich zainteresowanie polityką jest duże lub bardzo duże cechowała się wyższym poziomem aktywności w sieci

RoboPol: First season rotations of optical polarization plane in blazars

We present first results on polarization swings in optical emission of blazars obtained by RoboPol, a monitoring program of an unbiased sample of gamma-ray bright blazars specially designed for effective detection of such events. A possible connection of polarization swing events with periods of high activity in gamma rays is investigated using the dataset obtained during the first season of operation. It was found that the brightest gamma-ray flares tend to be located closer in time to rotation events, which may be an indication of two separate mechanisms responsible for the rotations. Blazars with detected rotations have significantly larger amplitude and faster variations of polarization angle in optical than blazars without rotations. Our simulations show that the full set of observed rotations is not a likely outcome (probability $\le 1.5 \times 10^{-2}$) of a random walk of the polarization vector simulated by a multicell model. Furthermore, it is highly unlikely ($\sim 5 \times 10^{-5}$) that none of our rotations is physically connected with an increase in gamma-ray activity.Comment: 16 pages, 9 figure