The determinants of teacher mobility. Evidence from a panel of Italian teachers

In the Italian system teachers are allocated to schools according to a seniority-based centralized system with no role of individual schools in attracting, selecting and retaining teachers. Largely because of the rather limited pay scale, seniority-based rights to move to a particular school and geographical location represent one of the main career opportunities for tenured teachers. This paper examines the main drivers of the resulting (voluntary) mobility of Italian teachers. We find that the teachers' place of birth (after securing a tenured position, teachers try find work near their place of birth) and several features related to the student mix and the social context of the school are very important. Teachers systematically try to move away from schools where teaching is likely to be more difficult, for example where the students come from a lower socio-economic background and have poorer educational abilities even though teachers could have a more important role in boosting students' human capital accumulation. The centralized allocation system does not appear to equalize opportunities among different school environments. Furthermore, the absence of any criteria other than seniority in regulating teachers' locational preferences produces high staff turnover and a widespread lack of motivation among teachers who, all too often, are simply waiting in one school until they can move on to another.The labour market for teachers, teacher mobility, geographical mobility, school characteristics

Parametric and semiparametric estimation of ordered response models with sample selection and individual-specific thresholds

This paper provides a set of new Stata commands for parametric and semiparametric estimation of an extended version of ordered response models that accounts for both sample selection problems and heterogeneity in the thresholds for the latent variable. The standard estimator of ordered response models is therefore generalized along three directions. First, we account for the presence of endogenous selectivity effects that may lead to inconsistent estimates of the model parameters. Second, we control for both observed and unobserved heterogeneity in response scales by allowing the thresholds to depend on a set of covariates and a random individual effect. Finally, we consider two alternative specifications of the model, one parametric and one semiparametric. In the former, the error terms are assumed to follow a multivariate Gaussian distribution and the model parameters are estimated via maximum likelihood. In the latter, the distribution function of the error terms is instead approximated by following Gallant and Nychka (1997), and the model parameters are estimated via pseudo–maximum likelihood. After discussing identification and estimation issues, we present an empirical application using the second wave of the Survey on Health, Ageing and Retirement in Europe (SHARE). Specifically, we estimate an ordered response model for self-reported health on different domains by accounting for both sample selection bias due to survey nonresponse and reporting bias in the self-assessments of health.

Geomorphic signal of active faulting at the northern edge of Lut Block. Insights on the kinematic scenario of Central Iran

Recent works documented Neogene to Quaternary dextral strike-slip tectonics along the Kuh-e-Sarhangi and Kuh-e-Faghan intraplate strike-slip faults at the northern edge of the Lut Block of Central Iran, previously thought to be dominated by sinistral strike-slip deformation. This work focuses on the evidence of Quaternary activity of one of these fault systems, in order to provide new spatio-temporal constraints on their role in the active regional kinematic scenario. Through geomorphological and structural investigation, integrated with Optically Stimulated Luminescence (OSL) dating of three generations of alluvial fans and fluvial terraces (at ~53, ~25 and ~6 ka), this study documents (i) the topographic inheritance of the long-term (Myr) punctuated history of fault nucleation, propagation, and exhumation along the northern edge of Lut Block; (ii) the tectonic control on drainage network evolution, pediment formation, fluvial terraces, and alluvial-fan architecture; (iii) the minimum Holocene age of Quaternary dextral strike-slip faulting; and (iv) the evidence of Late Quaternary fault-related uplift localized along the different fault strands. The documented spatial and temporal constraints on the active dextral strike-slip tectonics at the northern edge of Lut Block provided new insights on the kinematic model for active faulting in Central Iran, which has been reinterpreted in an escape tectonic scenario

Brown fat uptake of 18F-FDG on dual time point PET/CT imaging.

The aim of this report was to assess the changes in the 18F-fluorodeoxyglucose (18F-FDG) uptake of brown fats on integrated positron emission tomography/computed tomography (PET/ CT) imaging. The patient presented with an enlargement of the neck lymph nodes, and was suspicious for tuberculous lymphadenitis. A whole body PET/CT imaging was performed, followed by a delayed imaging of the neck and thoracic regions. A visually increased 18F-FDG uptake was taken as a positive finding. A semi-quantitative evaluation was performed using a maximum standardised uptake value (SUVmax) with a cut-off value above 2.5. There were a number of 18F-FDG avid activity areas seen at the supraclavicular, mediastinal, paravertebral and perirenal regions. These are in keeping with the physiological 18F-FDG uptake in brown fat. The differences in SUVmax between the two scans ranged from -20 percent to +20 percent. Based on our observation, dual time point imaging may not be a reliable method for assessing the 18F-FDG uptake of brown fat

Whole body imaging using 18-Fluorine Fluorodeoxyglucose (18F-FDG) Positron Emission Tomography/Computed Tomography (PET/CT) with or without contrast enhanced computed tomography (CT) in dignosing arteritis

Introduction: Takayasu’s Arteritis and Horton’s Arteritis are two rare cases of autoimmune complex diseases resulting in sterile inflammatory reactions affecting the wall of large and medium sized arteries. Various radiological and interventional methods employed are inconclusive and become diagnostic only when complications begin to set in. The new non-invasive hybrid Positron Emission Tomography Computed Tomography (PET/CT) using 18Florine-Fluorodeoxyglucose (18F-FDG) imaging technique could detect arteritis in an early clinical stage when routine conventional cross-sectional imaging was inconclusive. Method: Two cases from Klagenfurt Hospital, Austria and Milan General Hospital, Italy were compared with image acquisition being done in the respective hospitals. In Klagenfurt, PET/CT image acquisition was performed using intravenous contrast administration and in Milan, CT parameters were used as attenuation correction and anatomical correlation of PET images. Results: CT performed using both methods, with or without iodinated contrast media, were useful in detecting arteritis. Conclusion: It is concluded that PET/ CT aside from being a useful tool in cancer imaging, is also useful for pyrexia of unknown origin. PET/CT should be employed early in managing this clinical condition where arteritis is a possible diagnosis

Progetto Life+ 08NAT/IT/000369“GYPSUM”. Primi risultati sulle analisi chimiche delle acque nei gessi dell’Emilia Romagna

Dal 2010 è in corso il Progetto Life+ 08NAT/IT/000369 “Gypsum” finalizzato alla tutela e gestione dei principali ambienti gessosi dell’Emilia-Romagna e cofinanziato dall’Unione Europea. Nell’ambito dell’Azione A3 è previsto un monitoraggio pluriennale dei principali acquiferi carsici sotto l’aspetto chimico e microbiologico. In questo lavoro vengono presentati i primi risultati di questo monitoraggio idrochimico.Since 2010 a Project Life + 08NAT/IT/000369 “Gypsum” is running, dealing with the safeguard and management of the main gypsum environments of Emilia Romagna region and cofinanced by the European Union. Action A3 of this Project is concerned with the pluriannual hydrochemical and microbiological monitoring of the most important gypsum aquifers. In this paper the first results of this hydrochemical monitoring are presented

Spatio-temporal evolution of intraplate strike-slip faulting: the Neogene-Quaternary Kuh-e-Faghan Fault, Central Iran

Central Iran provides an ideal region to study the long-term morphotectonic response to the nucleation and propagation of intraplate faulting. In this study, a multidisciplinary approach that integrates structural and stratigraphic field investigations with apatite (U+Th)/He (AHe) thermochronometry is used to reconstruct the spatio-temporal evolution of the Kuh-e-Faghan Fault (KFF) in northeastern Central Iran. The KFF is a narrow, ca. 80 km long, deformation zone that consists of three main broadly left stepping, E-W trending, dextral fault strands that cut through the Mesozoic-Paleozoic substratum and the Neogene-Quaternary sedimentary cover. The AHe thermochronometry results indicate that the intra-fault blocks along the KFF experienced two major episodes of fault-related exhumation at ~18 Ma and ~4 Ma. The ~18 Ma faulting/exhumation episode is chiefly recorded by the structure and depositional architecture of the Neogene deposits along the KFF. A source-to-sink scenario can be reconstructed for this time frame, where topographic growth caused the synchronous erosion/exhumation of the pre-Neogene units and deposition of the eroded material in the surrounding fault-bounded continental depocenters. Successively, the KFF gradually entered a period of relative tectonic quiescence and, probably, of regional subsidence during which a thick pile of fine-grained onlapping sediments were deposited. This may have caused resetting of the He ages of apatite in the pre-Neogene and the basal Neogene successions. The ~4 Ma faulting episode caused the final exhumation of the fault system, resulting in the current fault zone and topography. The two fault-related exhumation episodes fit with the regional early Miocene collision-enhanced uplift/exhumation, and the late Miocene–early Pliocene widespread tectonic reorganization of the Iranian plateau. The reconstructed long term, spatially and temporally punctuated fault system evolution in intraplate Central Iran during Neogene-Quaternary times may reflect states of far-field stress changes at the collisional boundaries

Clinical significance of prophylactic central compartment neck dissection in the treatment of clinically node-negative papillary thyroid cancer patients

BACKGROUND: Lymph nodal involvement is very common in differentiated thyroid cancer, and in addition, cervical lymph node micrometastases are observed in up to 80 % of papillary thyroid cancers. During the last decades, the role of routine central lymph node dissection (RCLD) in the treatment of papillary thyroid cancer (PTC) has been an object of research, and it is now still controversial. Nevertheless, many scientific societies and referral authors have definitely stated that even if in expert hands, RCLD is not associated to higher morbidity; it should be indicated only in selected cases. MAIN BODY: In order to better analyze the current role of prophylactic neck dissection in the surgical treatment of papillary thyroid cancers, an analysis of the most recent literature data was performed. Prophylactic or therapeutic lymph node dissection, selective, lateral or central lymph node dissection, modified radical neck dissection, and papillary thyroid cancer were used by the authors as keywords performing a PubMed database research. Literature reviews, PTCs large clinical series and the most recent guidelines of different referral endocrine societies, inhering neck dissection for papillary thyroid cancers, were also specifically evaluated. A higher PTC incidence was nowadays reported in differentiated thyroid cancer (DTC) clinical series. In addition, ultrasound guided fine-needle aspiration citology allowed a more precocious diagnosis in the early phases of disease. The role of prophylactic neck dissection in papillary thyroid cancer management remains controversial especially regarding indications, approach, and surgical extension. Even if morbidity rates seem to be similar to those reported after total thyroidectomy alone, RCLD impact on local recurrence and long-term survival is still a matter of research. Nevertheless, only a selective use in high-risk cases is supported by more and more scientific data. CONCLUSIONS: In the last years, higher papillary thyroid cancer incidence and more precocious diagnoses were worldwide reported. Among endocrine and neck surgeons, there is agreement about indications to prophylactic treatment of node-negative “high-risk” patients. A recent trend toward RCLD avoiding radioactive treatment is still debated, but nevertheless, prophylactic dissections in low-risk cases should be avoided. Prospective randomized trials are needed to evaluate the benefits of different approaches and allow to drawn definitive conclusions

Potential false positive active extra pulmonary tuberculosis lesions on FDG PET/CT imaging in malignancy.

Objectives: Integrated fusion imaging modality Positron Emission Tomography Computed Tomography (PET/CT)using 18Fluorine-Fluoro Deoxy Glucose (18F-FDG) iscommonly utilized in imaging oncology. We expand therole of this imaging modality in our study to demonstratethe appearance of active extra pulmonary tuberculosis(TB) lesions. Materials and methods: This study involved prospective evaluation of 8 patients using 18F-FDG PET/CT with confirmed diagnosis of extra pulmonary TB infection. Visually high intensity lesions in abnormal areas were studied where the mean and maximum standardized uptake value (SUVmean and SUVmax) were tabulated. The diagnosis of TB infection was confirmed by isolation of TB bacillus from these lesions or evidence of responding to anti TB treatment during post treatment evaluation using FDGPET/ CT at follow up.Results: The genders are equally affected. Majority of the group falls within young age below 50 years. Number of PET/CT studies demonstrating lesions either singly or multiple were equal in distribution. Nodal involvement is commonest in our study including mediastinum, paraaorticand inguinal groups. Other sites of infection includespine and bowel. The average SUVmax and SUVmean for alllesions were 7.7 and 5.2 respectively. Conclusion: Active TB lesions are FDG avid. Thus, FDGavid lesions should be interpreted with extra careful whenFDG PET / CT is utilized in managing malignancy

18F-FDG positron emission tomography computed tomography and the "underground map" appearance in imaging Horton's arteritis

A majority of the clinical use of positron emission tomography (PET)-computed tomography (CT) is related to cancer management. Its application in evaluating inflammatory diseases and pyrexia of unknown origin is becoming popular. We reviewed the fluorine-18-fluorodeoxyglucose PET-CT findings of an 80-year-old woman with nonspecific clinical presentation consisting of generalised malaise, moderately high fever and weight loss. Prior CT and magnetic resonance imaging were not helpful in providing a clinical diagnosis. The diagnosis was Horton's arteritis, and the patient responded well to high-dose steroids