Why do scientists migrate? A diffusion model

The article is intended to improve our understanding of the reasons underlying the intellectual migration of scientists from well-known cognitive domains to nascent scientific fields. To that purpose we present, first, a number of findings from the sociology of science that give different insights about this phenomenon. We then attempt to bring some of these insights together under the conceptual roof of an actor-based approach linking expected utility and diffusion theory. Intellectual migration is regarded as the rational choice of scientists who decide under uncertainty and on the base of a number of decision-making variables, which define probabilities, costs, and benefits of the migration.

Patterns of Subject Mix in Higher Education Institutions : A First Empirical Analysis Using the AQUAMETH Database

Teaching and research are organised differently between subject domains: attempts to construct typologies of higher education institutions, however, often do not include quantitative indicators concerning subject mix which would allow systematic comparisons of large numbers of higher education institutions among different countries, as the availability of data for such indicators is limited. In this paper, we present an exploratory approach for the construction of such indicators. The database constructed in the AQUAMETH project, which includes also data disaggregated at the disciplinary level, is explored with the aim of understanding patterns of subject mix. For six European countries, an exploratory and descriptive analysis of staff composition divided in four large domains (medical sciences, engineering and technology, natural sciences and social sciences and humanities) is performed, which leads to a classification distinguishing between specialist and generalist institutions. Among the latter, a further distinction is made based on the presence or absence of a medical department. Preliminary exploration of this classification and its comparison with other indicators show the influence of long term dynamics on the subject mix of individual higher education institutions, but also underline disciplinary differences, for example regarding student to staff ratios, as well as national patterns, for example regarding the number of PhD degrees per 100 undergraduate students. Despite its many limitations, this exploratory approach allows defining a classification of higher education institutions that accounts for a large share of differences between the analysed higher education institutions.

Il Discorso dell'amore verso la patria (1631) di Ludovico Zuccolo

Scopo di questo studio è la disamina e la divulgazione dei pregi letterari e del valore concettualmente innovativo del Discorso dell 'amore verso la patria di Ludovico Zuccolo. L'analisi dei contenuti dell'opera, unitamente alla puntualizzazione delle sue caratteristiche formali e stilistiche, permette di vedere come questo scrittore proponga, utilizzando la forma letteraria del discorso politico, una riuscita codificazione della tematica dei diritti e dei doveri dei cittadini verso la patria; operazione in cui si sostanzia, a mio avviso, l'apporto innovativo dello Zuccolo. Dopo l'iniziale riscoperta, da parte di Benedetto Croce, del capitolo delle Considerazioni sulla Ragion di Stato, l`opera dello Zuccolo ha generato un certo interesse critico fra gli studiosi di letteratura politica del "900" senza tuttavia divenire oggetto di contributi esaustivi malgrado, a nostro parere, la presenza di elementi di originalità di pensiero nel Discorso dell 'amore verso la patria. Inoltre, l'opinione degli specialisti non è mai stata unanime riguardo al valore e ai contenuti delle opere di questo autore. Se per il Croce, ne << La Critica >> del 1926, egli appare come colui che ha prodotto, «Lo scritto più acuto e originale sull'argomento [della Ragion di Stato], composto in quel seco1o.>> (p. 301), per altri egli si presenta come un dotto estensore di trattati politici nei quali sfoggia abilmente la sua erudizione classica e Luigi Firpo arriva a suggerire addirittura che lo Zuccolo sia colpevole di plagio proprio laddove tratta il tema della Ragion di Stato : Al punto in cui siamo, una cosa è certa, e cioè che i conti non tornano : non riesco a credere che uno scrittore inzeppi centinaia e centinaia di pagine di luoghi comuni, di erudizione d"accatto, di oziosità accademiche, e poi un bel mattino, morso dalla tarantola o baciato in fronte da Minerva, metta in carta il piccolo capolavoro, le pagine meditate e profonde, e perciò lungamente soffeite, che pure gli appartengono per una paternità incontestata e certa. Dico questo, perché in un caso del genere, non al miracolo s"avrebbe da credere, ma, semmai, al plagio. (1). Catherine Pitiot, nel suo saggio La retorica politica nell 'opera utopica di Ludovico Zuccolo, coglie invece in questo autore unicamente l"utopista che << lntende allontanarsi dalla realtà contemporanea per modificarla, correggerla e presentare un'in1magine che sia fondamentalmente diversa, a livello strutturale. >> (2). Di parere diametralmente opposto Rodolfo de Mattei, che attribuisce allo Zuccolo lo status di anti-utopista per eccellenza, tipico di uno scrittore che, Non ha voluto usufruire della facile libertà della fantasia per sovvertire l'ordine storico e per alterare arbitrariamente la natura umana, cioé per proporre un ordinamento mirante ad una radicale trasformazione della società e quindi di assai dubbia realizzazione. (3). Altri studiosi, fra cui Bruno Nediani, si sono dedicati alla descrizione della personalità dello Zuccolo, attingendo alle sue lettere - che lo stesso Nediani ha riscoperto - oltre che ai brevi accermi che di sé fa lo Zuccolo negli scritti. Dal saggio del Nediani, La personalità di Ludovico Zuccolo (1969), emerge la figura di un uomo tormentato e insoddisfatto, ossessionato dal sospetto dell"autorità ecclesiastica, costretto a procacciarsi impieghi inadeguati presso i potenti, all'inseguimento dell'obiettivo di una carriera che, comunque, finisce con il risultargli sempre, prima o poi, insopportabile. Più recentemente, Sergio Bertelli, nel suo contributo alla Storia della letteratura di Cecchi e Sapegno, ha aperto una nuova prospettiva sullo Zuccolo proponendolo come colui che, Spezza finalmente il cerchio moralistico costruito dal Botero attorno al pensiero machiavelliano e la ragion di stato cessa di essere giudicata vera o falsa, buona o malvagia, interessando in sé e per sé, cioé nei suoi presupposti e nei suoi fini esclusivamente politici. (4).

Indicazioni e risultati della laparostomia retroperitoneale nel trattamento della pancreatite acuta necrotizzante infetta [Indications and results of retroperitoneal laparostomy in the treatment of infected acute necrotizing pancreatitis]

The aim of this study is to describe personal experience with retroperitoneal laparostomy in the management of infected acute necrotizing pancreatitis. The presence of an infected phlegmon requires surgical debridement and drainage. The surgical approach can be either an anterior laparotomy with irrigation and drainage (which can be either an open or closed laparotomy) or a posterior laparostomy. Three patients (2 men and 1 woman) presented with an unfavourable course of their acute necrotizing pancreatitis despite the administration of broad spectrum antibiotics. A posterior laparostomy with necrosectomy and drainage was performed. The postoperative course was slowly favorable in all 3 cases. Abdominal CT is the best modality for the detection and follow-up of pancreatic necrosis. CT-guided fine needle aspiration can detect superinfection of areas of necrosis. Posterior laparostomy presents several advantages compared to an anterior approach. There is no contamination of the peritoneal cavity; the integrity of the abdominal wall is respected. The necrosectomy is equally complete and the drainage is better as it is direct and posterior.

Treatment of chronic hepatitis C.

Treatment for chronic hepatitis C has changed over the past years achieving higher response rates. The combination treatment with pegylated interferon-a and ribavirin is tailored based on the on-treatment virological responses. With this response-guided therapy, the overall sustained virological response rate is about 55%. Many new antivirals are currently under investigation and some will be commercially available in the near future. These include antiviral molecules acting directly against the hepatitis C virus (HCV) replication machinery, such as the inhibitors of the viral protease, and agents binding to host cofactors of the viral replication, thereby inhibiting HCV in an indirect way (such as cyclophilin inhibitors and nitazoxanide). The advent of these drugs will further ameliorate response rates and facilitate the permanent cure of chronic hepatitis C.

Neuromonitoring after major neurosurgical procedures.

Postoperative care of major neurosurgical procedures is aimed at the prevention, detection and treatment of secondary brain injury. This consists of a series of pathological events (i.e. brain edema and intracranial hypertension, cerebral hypoxia/ischemia, brain energy dysfunction, non-convulsive seizures) that occur early after the initial insult and surgical intervention and may add further burden to primary brain injury and thus impact functional recovery. Management of secondary brain injury requires specialized neuroscience intensive care units (ICU) and continuous advanced monitoring of brain physiology. Monitoring of intracranial pressure (ICP) is a mainstay of care and is recommended by international guidelines. However, ICP monitoring alone may be insufficient to detect all episodes of secondary brain insults. Additional invasive (i.e. brain tissue PO2, cerebral microdialysis, regional cerebral blood flow) and non-invasive (i.e. transcranial doppler, near-infrared spectroscopy, EEG) brain monitoring devices might complement ICP monitoring and help clinicians to target therapeutic interventions (e.g. management of cerebral perfusion pressure, blood transfusion, glucose control) to patient-specific pathophysiology. Several independent studies demonstrate such multimodal approach may optimize patient care after major neurosurgical procedures. The aim of this review is to evaluate some of the available monitoring systems and summarize recent important data showing the clinical utility of multimodal neuromonitoring for the management of main acute neurosurgical conditions, including traumatic brain injury, subarachnoid hemorrhage and stroke.

How to monitor the brain in septic patients?

Brain injury is frequently observed after sepsis and may be primarily related to the direct effects of the septic insult on the brain (e.g., brain edema, ischemia, seizures) or to secondary/indirect injuries (e.g., hypotension, hypoxemia, hypocapnia, hyperglycemia). Management of brain injury in septic patients is first focused to exclude structural intracranial complications (e.g., ischemic/hemorrhagic stroke) and possible confounders (e.g., electrolyte alterations or metabolic disorders, such as dysglycemia). Sepsis-associated brain dysfunction is frequently a heterogeneous syndrome. Despite increasing understanding of main pathophysiologic determinants, therapy is essentially limited to protect the brain against further cerebral damage, by way of "simple" therapeutic manipulations of cerebral perfusion and oxygenation and by avoiding over-sedation. Non-invasive monitoring of cerebral perfusion and oxygenation with transcranial Doppler (TCD) and near-infrared spectroscopy (NIRS) is feasible in septic patients. Electroencephalography (EEG) allows detection of sepsis-related seizures and holds promise also as sedation monitoring. Brain CT-scan detects intra-cerebral structural lesions, while magnetic resonance imaging (MRI) provides important insights into primary mechanisms of sepsis-related direct brain injury, (e.g., cytotoxic vs. vasogenic edema) and the development of posterior reversible encephalopathy. Together with EEG and evoked potentials (EP), MRI is also important for coma prognostication. Emerging clinical evidence suggests monitoring of the brain in septic patients can be implemented in the ICU. The objective of this review was to summarize recent clinical data about the role of brain monitoring - including TCD, NIRS, EEG, EP, CT, and MRI - in patients with sepsis and to illustrate its potential utility for the diagnosis, management and prognostication.

MRI/TRUS fusion software-based targeted biopsy: the new standard of care?

The advent of multiparametric MRI has made it possible to change the way in which prostate biopsy is done, allowing to direct biopsies to suspicious lesions rather than randomly. The subject of this review relates to a computer-assisted strategy, the MRI/US fusion software-based targeted biopsy, and to its performance compared to the other sampling methods. Different devices with different methods to register MR images to live TRUS are currently in use to allow software-based targeted biopsy. Main clinical indications of MRI/US fusion software-based targeted biopsy are re-biopsy in men with persistent suspicious of prostate cancer after first negative standard biopsy and the follow-up of patients under active surveillance. Some studies have compared MRI/US fusion software-based targeted versus standard biopsy. In men at risk with MRI-suspicious lesion, targeted biopsy consistently detects more men with clinically significant disease as compared to standard biopsy; some studies have also shown decreased detection of insignificant disease. Only two studies directly compared MRI/US fusion software-based targeted biopsy with MRI/US fusion visual targeted biopsy, and the diagnostic ability seems to be in favor of the software approach. To date, no study comparing software-based targeted biopsy against in-bore MRI biopsy is available. The new software-based targeted approach seems to have the characteristics to be added in the standard pathway for achieving accurate risk stratification. Once reproducibility and cost-effectiveness will be verified, the actual issue will be to determine whether MRI/TRUS fusion software-based targeted biopsy represents anadd-on test or a replacement to standard TRUS biopsy.

Single amino acid charge switch defines clinically distinct proline-serine-threonine phosphatase-interacting protein 1 (PSTPIP1)-associated inflammatory diseases.

BACKGROUND: Hyperzincemia and hypercalprotectinemia (Hz/Hc) is a distinct autoinflammatory entity involving extremely high serum concentrations of the proinflammatory alarmin myeloid-related protein (MRP) 8/14 (S100A8/S100A9 and calprotectin). OBJECTIVE: We sought to characterize the genetic cause and clinical spectrum of Hz/Hc. METHODS: Proline-serine-threonine phosphatase-interacting protein 1 (PSTPIP1) gene sequencing was performed in 14 patients with Hz/Hc, and their clinical phenotype was compared with that of 11 patients with pyogenic arthritis, pyoderma gangrenosum, and acne (PAPA) syndrome. PSTPIP1-pyrin interactions were analyzed by means of immunoprecipitation and Western blotting. A structural model of the PSTPIP1 dimer was generated. Cytokine profiles were analyzed by using the multiplex immunoassay, and MRP8/14 serum concentrations were analyzed by using an ELISA. RESULTS: Thirteen patients were heterozygous for a missense mutation in the PSTPIP1 gene, resulting in a p.E250K mutation, and 1 carried a mutation resulting in p.E257K. Both mutations substantially alter the electrostatic potential of the PSTPIP1 dimer model in a region critical for protein-protein interaction. Patients with Hz/Hc have extremely high MRP8/14 concentrations (2045 ± 1300 μg/mL) compared with those with PAPA syndrome (116 ± 74 μg/mL) and have a distinct clinical phenotype. A specific cytokine profile is associated with Hz/Hc. Hz/Hc mutations altered protein binding of PSTPIP1, increasing interaction with pyrin through phosphorylation of PSTPIP1. CONCLUSION: Mutations resulting in charge reversal in the y-domain of PSTPIP1 (E→K) and increased interaction with pyrin cause a distinct autoinflammatory disorder defined by clinical and biochemical features not found in patients with PAPA syndrome, indicating a unique genotype-phenotype correlation for mutations in the PSTPIP1 gene. This is the first inborn autoinflammatory syndrome in which inflammation is driven by uncontrolled release of members of the alarmin family.