1,721,258 research outputs found
Unequal growth
Full text linkOver the past 50 years, households in the United States have experienced changes in earn-ings dynamics that have resulted in a large increase in inequality. This paper assesses the impact of these changes on aggregate growth and welfare. We begin by inspecting a simple statistical decomposition of aggregate earnings growth using data from the Panel Study of Income Dynamics for the period 1967-2018. The decomposition expresses aggregate earn-ings growth as the sum of two terms. The first is the covariance between the level and growth of household earnings, which depends only on micro earnings dynamics. The sec-ond is the average growth across households, which depends on both micro and macro factors, such as a common labor productivity growth. In order to identify the impact of the changes in the micro dynamics on aggregate outcomes, we map a simple model of micro -founded growth onto the terms of the decomposition. We find that changes in households' earnings dynamics that are consistent with the micro data imply unequal growth across the earnings distribution that is, a transition period during which there is a change in the shape of the distribution of incomes that is not mean preserving, so that aggregate growth is affected. This change yields a positive effect on aggregate growth and, with incomplete markets, an ex-ante negative welfare effect. (c) 2022 Published by Elsevier B.V
Differences between Southalpine and Austroalpine quartz phyllite complexes from the Eastern Alps: results from zircon chemical compositions and Pb/Pb dating.
No full textTypological study of zircons from the arenites of Triassic to early Jurassic continental redbeds from the Calabria-Peloritan Arc, Southern Italy.
No full textReconstructing parental affinity and climatic and physiographic conditions from the compositional signatures of Triassic-Early Jurassic continental redbeds, Peloritani Mountains, Sicily, Italy.
No full textIntraduodenal lipase activity in celiac disease assessed by means of 13c mixed-triglyceride breath test
No full textBACKGROUND: In patients with celiac disease, the occurrence of exocrine pancreatic insufficiency has been related to an impairment of the gut-mediated stimulatory effect of the meal on the pancreas. The purpose of this study was to assess the intraduodenal lipase activity in patients with celiac disease by means of the 13C mixed-triglyceride breath test and to monitor pancreatic function after the institution of a gluten-free diet.METHODS: Seventeen untreated patients with celiac disease (mean age, 17.4 +/- 10.5 years) were studied. After an overnight fast, patients were given a standard test meal consisting of 100 g of white bread and 0.25 g of butter per kilogram of body weight, to which 16 mg di-stearyl-13C-octanoyl-glyceride (mixed triglyceride) had been added. Breath samples were taken twice at baseline and at 30-minute intervals for 6 hours after the meal. 13C enrichment in breath was determined by means of Isotope Ratio Mass Spectrometer (IRMS) (ANCA-NT; Europa Scientific, Crewe, UK). Results were expressed as the maximum percentage of 13C recovery per hour at any time, the time to reach peak excretion of 13C, and the percentage of 13C cumulative dose over 6 hours.RESULTS: Mixed-triglyceride breath test results were pathologic in three patients and at the lower limit of the normal range in another patient. In the remaining 13 patients, the results were within normal values. At the 6- and 12-month follow-ups, all patients showed normal intraduodenal lipase activity.CONCLUSIONS: In approximately 24% of patients with celiac disease, the intraduodenal pancreatic lipolytic activity is impaired. The mixed-triglyceride breath test could be used to assess fat maldigestion and to monitor the need for enzyme replacement therapy in such patients
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Sedimentary recycling, provenance and paleoweathering from chemistry and mineralogy of Mesozoic continental redbeds mudrocks, Peloritani Mountains, Southern Italy.
No full textThe Triassic to Lowermost Jurassic mudrocks from continental redbeds of the Longi-Taormina Unit (Calabria-Peloritani
Arc; southern Italy) have been mineralogically, chemically and petrographically analyzed, in order to reveal their complex
history, which record an important phase of the geological evolution of the Mediterranean area.
The Late Triassic corresponds with a low first-order sea level stand and a time of high continental emergence whereas
the Early Jurassic was the time of the initiation of the first-order sea level rise in the mid-Mesozoic, generally marked by
a transgressive trend.
The mineralogical assemblage, dominated by the occurrence of illite and illite/smectite mixed layers, coupled to the
CIA index and to the A-CN-K plot, indicates post-depositional K-enrichments.
Palaeoweathering indices (CIW and PIA ratios) suggest that the source experienced intense weathering and that they
likely record a recycling effect from their metasedimentary basement rocks. A recycling effect is also suggested by the
distribution of Al2O3, TiO2, and Zr. In the Zr/Sc vs. the Th/Sc plot the redbeds are not clustered along the primary
compositional trend but fall along a trend involving zircon addition and thus sediment recycling. Recycling could significantly
affect the weathering indices which likely monitor a cumulative effect including a first cycle of weathering at the
source rocks. Weathering occurred under hot, episodically humid climate with a prolonged dry season. Wet-humid conditions
favored the formation of stream channels that eroded the soil profiles, whereas the dry season promoted the sedimentation.
The climate alternation in the Early Jurassic favored recycling.
An additional provenance terrane occurring in the basement, including metavolcanic rocks having mafic composition
cannot be excluded, since the Eu anomaly is slightly higher than the PAAS value. Although the effects of recycling on
REE distribution are uncertain, the Eu/Eu* should increase, as more feldspar is destroyed during weathering and diagenesis.
This involves that the Eu/Eu* ratio could monitor a supply of low Eu/Eu* mafic detritus which compensate for the recycling
effect by reducing Eu/Eu*. Eu released during the dissolution of feldspar could be retained by clay minerals contributing
to minimize the recycling induced increase of the Eu-anomaly. This may involve that the recycling effect on the Euanomaly
was minor and that the low Eu/Eu* mafic detritus supply was also minor. The subordinate importance of a mafic
supply is confirmed also by other provenance proxies including the La-Th-Sc plot and the Cr/V and Y/Ni ratios.
The proportions of illitic layers in I/S mixed layers coupled with the illite crystallinity values, expressed as Kübler
Index (KI), suggesting an estimated temperature experienced by the Longi Units in the range of 100–150°C. Starting fro
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