26,781 research outputs found
Título: Exercitia phytoligica quibus omnes plantae europeae [sic] ...
Tit. en antep.: "Supplementum systematis plantarum Europae"Sign. : []2, S-Z8, Aa-Sa8Grab. calc. de planta
Título: Exercitia phytoligica quibus omnes plantae europaeae [sic] ...
Tit. en antep.: "Supplementum systematis plantarum Europae"Sign. : a-e8, A-R8Grab. calc. de planta
Optical spectroscopy of two overlapping, flux-density-limited samples of radio sources in the North Ecliptic Cap, selected at 38 MHz and 151 MHz
We present the results of optical spectroscopy of two flux-density-limited
samples of radio sources selected at frequencies of 38 and 151 MHz in the same
region around the North Ecliptic Cap, the 8C-NEC and 7C-III samples
respectively. Both samples are selected at flux density levels ~20 times
fainter than samples based on the 3C catalogue. They are amongst the first
low-frequency selected samples with no spectral or angular size selection for
which almost complete redshift information has been obtained and they will
therefore provide a valuable resource for understanding the cosmic evolution of
radio sources and their hosts and environments. The 151-MHz 7C-III sample is
selected to have S_151 >=0.5 Jy and is the more spectroscopically complete; out
of 54 radio sources fairly reliable redshifts have been obtained for 44
objects. The 8C sample has a flux limit of S_38 >=1.3 Jy and contains 58
sources of which 46 have fairly reliable redshifts. We discuss possible biases
in the observed redshift distribution, and some interesting individual objects.
Using the 8C-NEC and 7C-III samples in conjunction, we form the first sample
selected on low-frequency flux in the rest-frame of the source, rather than the
usual selection on flux density in the observed frame. This allows us to remove
the bias associated with an increasing rest-frame selection frequency with
redshift. We investigate the difference this selection makes to correlations of
radio source properties with redshift and luminosity. We show in particular
that flux-density-based selection leads to an overestimate of the steepness of
the correlation of radio source size with redshift. (abridged)Comment: 22 pages, 10 figures, accepted by MNRA
Experimental steady-state performance of a multitube, centrally finned, potassium condensing radiator
Steady state performance of multitube, centrally finned, potassium condensing radiato
Was the Korean slave market efficient?
Over the decades, the traditional condemnation of slavery has been based not only on philosophical argumentation and moral values, but also on the conjecture that slavery was inefficient. This position led to one of the most passionate debates in economic history on the efficiency of the US slave market. This question of efficiency has not been analyzed on the slave market in Korea. The aim of this paper is to analyze the efficiency of the Korean slave market by examining the behavior of slave prices during the period 1689-1893. In order to do so, we collected long-run series of slave prices from nationwide surveys of more than 25 public and private historical records. We then tested whether the slave market was efficient using the arbitrage asset equation. We found slavery to have been efficient most of the time.arbitrage asset equation; efficient markets; Korea; slave
The Evolution of the Stellar Hosts of Radio Galaxies
We present new near-infrared images of z>0.8 radio galaxies from the
flux-limited 7C-III sample of radio sources for which we have recently obtained
almost complete spectroscopic redshifts. The 7C objects have radio luminosities
about 20 times fainter than 3C radio galaxies at a given redshift. The absolute
magnitudes of the underlying host galaxies and their scale sizes are only
weakly dependent on radio luminosity. Radio galaxy hosts at z~2 are
significantly brighter than the hosts of radio-quiet quasars at similar
redshifts and the model AGN hosts of Kauffmann & Haehnelt (2000). There is no
evidence for strong evolution in scale size, which shows a large scatter at all
redshifts. The hosts brighten significantly with redshift, consistent with the
passive evolution of a stellar population that formed at z>~3. This scenario is
consistent with studies of host galaxy morphology and submillimeter continuum
emission, both of which show strong evolution at z>~2.5. The lack of a strong
``redshift cutoff'' in the radio luminosity function to z>4 suggests that the
formation epoch of the radio galaxy host population lasts >~1Gyr from z>~5 to
z~3. We suggest these facts are best explained by models in which the most
massive galaxies and their associated AGN form early due to high baryon
densities in the centres of their dark matter haloes.Comment: To appear in A
Inaugurating a Dutch Napoleon? Conservative criticism of the 1815 constitution of the United Kingdom of The Netherlands
International audienc
Interleukin-22 predicts severity and death in advanced liver cirrhosis: a prospective cohort study
Background: Interleukin-22 (IL-22), recently identified as a crucial parameter of pathology in experimental liver damage, may determine survival in clinical end-stage liver disease. Systematic analysis of serum IL-22 in relation to morbidity and mortality of patients with advanced liver cirrhosis has not been performed so far.
Methods: This is a prospective cohort study including 120 liver cirrhosis patients and 40 healthy donors to analyze systemic levels of IL-22 in relation to survival and hepatic complications.
Results: A total of 71% of patients displayed liver cirrhosis-related complications at study inclusion. A total of 23% of the patients died during a mean follow-up of 196 +/- 165 days. Systemic IL-22 was detectable in 74% of patients but only in 10% of healthy donors (P 18 pg/ml, n = 57) showed significantly reduced survival compared to patients with regular ([less than or equal to]18 pg/ml) levels of IL-22 (321 days versus 526 days, P = 0.003). Other factors associated with overall survival were high CRP ([greater than or equal to]2.9 mg/dl, P = 0.005, hazard ratio (HR) 0.314, confidence interval (CI) (0.141 to 0.702)), elevated serum creatinine (P = 0.05, HR 0.453, CI (0.203 to 1.012)), presence of liver-related complications (P = 0.028, HR 0.258 CI (0.077 to 0.862)), model of end stage liver disease (MELD) score [greater than or equal to]20 (P = 0.017, HR 0.364, CI (0.159 to 0.835)) and age (P = 0.011, HR 1.047, CI (1.011 to 1.085)). Adjusted multivariate Cox proportional-hazards analysis identified elevated systemic IL-22 levels as independent predictors of reduced survival (P = 0.007, HR 0.218, CI (0.072 to 0.662)).
Conclusions: In patients with liver cirrhosis, elevated systemic IL-22 levels are predictive for reduced survival independently from age, liver-related complications, CRP, creatinine and the MELD score. Thus, processes that lead to a rise in systemic interleukin-22 may be relevant for prognosis of advanced liver cirrhosis
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