1,720,983 research outputs found
Transcranial color Doppler (TCCD) in the study of symptomatic middle cerebral artery stenosis
No full textDrug abuse in chronic headache: a clinico-epidemiologic study.
No full textAmong the patients referred to the Headache Centre in Parma between 1979 and 1984, 95 (5\%) were found to be drug abusers, having taken analgesics every day for at least a year. They had had chronic headache for at least 12 months: migraine with interparoxysmal headache in 83.1\% and chronic tension headache in 16.9\%. Almost all patients were combination-analgesics abusers, and only about a quarter of them were taking ergotamine. The largest single factor favouring the transformation of episodic headache into a chronic one was the drug abuse. The patients studied during 1984 were subjected to detoxification with 6 months' follow-up study. Our investigation suggests that all instant-relief drugs can sustain and possibly initiate a chronic headache
Echocontrast and dedicated equipment multi pulse technique improves the role of TCCD in the management of stroke
No full textEchocontrast and dedicated equipment. Multi pulse technique improves the role of TCCD in the management of cerebrovascular disease
No full textLow-flow ischemia and hypoxia stimulate apoptosis in perfused rat hearts independently of reperfusion
Full text linkPost-ischemic reperfusion leads to apoptosis-linked loss of myocytes in cultured cells and in vivo. We tested the hypothesis that apoptosis develops without reperfusion in Langendorff-perfused hearts exposed to either low-flow ischemia (LFI) or hypoxia (H). Rat hearts were perfused with aminoacid-enriched Krebs- Henseleit buffer and exposed for 6 h to LFI (flow=2 ml/min, PO2=500±50mmHg, mean±SD), H (10ml/min, 120±15mmHg), or control conditions (C, 10ml/min, 500±50mmHg). At selected times, DNA-fragmentation was measured by agarose-gel electrophoresis and in situ TUNEL assay. After 6 h, the ratio (TUNEL-positi- ve)/(total nuclei) was 0.620±0.027, 0.615±0.005, 0.404±0.021 in LFI, H and C, respectively. The ratio was 0.813±0.021 in hearts exposed to 90 min global no-flow ischemia and reperfused (5 h). To assess the role of membrane-diffusible factors, separate experiments were performed recirculating the medium and exposing hearts to LFI or H as above. The degree of apoptosis was the same in both the recirculating
and non-recirculating modes. Thus, apoptosis develops by similar extents and in a time-dependent fashion in crystalloid-perfused rat hearts during LFI or H at the same oxygen shortage (flow•PO2), even without the reperfusion
Evidence of apoptosis in the crystalloid-perfused isolated rat heart during low-flow ischemia or hypoxia
No full text
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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