Search results for "Night"
showing 10 items of 133 documents
Ambulatory Arterial Stiffness Index (AASI) is Unable to Estimate Arterial Stiffness of Hypertensive Subjects: Role of Nocturnal Dipping of Blood Pres…
2018
BACKGROUND: Ambulatory Arterial Stiffness Index (AASI) has been proposed as an indirect and simpler method to estimate the Arterial Stiffness (AS). AASI, calculated from a set of data collected during a 24-hours ambulatory blood pressure monitoring (ABPM), is defined as 1 minus the regression slope of diastolic on systolic blood pressure (BP) values. For a given increase in diastolic BP, the increase in systolic BP is smaller in a compliant compared to a stiff artery; the stiffer the arterial tree, the closer AASI is to 1. AASI was demonstrated to predict cardiovascular mortality, cerebrovascular events and to be associated with target organ damage. Taking into account the almost complete a…
The effect of spherical aberration on visual performance and refractive state for stimuli and tasks typical of night viewing
2018
Purpose: The aim of this work was to examine the impact of Seidel spherical aberration (SA) on optimum refractive state for detecting and discriminating small bright lights on a dark background. Methods: An adaptive-optics system was used to correct ocular aberrations of cyclopleged eyes and then systematically introduce five levels of Seidel SA for a 7-mm diameter pupil: 0, ± 0.18, and ± 0.36 diopters (D) mm−2. For each level of SA, subjects were required to detect one or resolve two points of light (0.54 arc min diameter) on a dark background. Refractive error was measured by adjusting stimulus vergence to minimize detection and resolution thresholds. Two other novel focusing tasks for si…
The burden of peri-operative work at night as perceived by anaesthesiologists: An international survey
2023
Background: No international data are available on the night working conditions and workload of anaesthesiologists and their opinions about associated risks. Objective: The aim of this international survey was to describe the peri-operative night working conditions of anaesthesiologists and their perception of the impact these conditions have on patient outcomes and their own quality of life. Design: Cross-sectional survey. Setting: Not applicable. Participants: Anaesthesiologists providing peri-operative care during night shifts responded to an online survey promoted by the European Society of Anaesthesiology and Intensive Care (ESAIC). Interventions: None. Main outcome measure: Twenty-eig…
Workplace Health Promotion Program on Using Dietary Antioxidants (Anthocyanins) in Chemical Exposed Workers
2012
Abstract Workplace health promotion is a business management system that aims to promote and improve the health situations of all employees in a comprehensive and sustainable mode, and should be seen as an equal partner for occupational health and safety. Certain industrial hazards (in particular chemical agents) display oxidant capacity in the human body acting via oxidative stress, caused by a cellular excess of reactive oxygen and nitrogen species. Species like superoxide and hydrogen peroxide are involved in protein kinase regulation, while nitric oxide and peroxynitrite inactivate phosphatases as well as activating kinases, which are key agents for translating signals of cell needs int…
Enhanced Tropospheric Wave Forcing of Two Anticyclones in the Prephase of the January 2009 Major Stratospheric Sudden Warming Event
2017
Monthly Weather Review, 145 (5)
Waging War Against Mechanical Man. Frank H. Knight's Critique of Behavioristic Psychology
2002
The major theme of this essay is to explore the rationale of Knight's campaign against the adoption of behaviorism in economics. We also attempt to qualify whether Knight's methodological criticism may somewhat undermine his recently acquired credentials as an institutionalist economist. In so doing we focus our attention in particular, but not exclusively, on his debate with the institutionalist Morris A. Copeland. In the first section we try to explain why behaviorism gained consensus among institutional economists, and we also provide a brief overview of the main behavioristic themes as they were presented in contemporary economic literature. The second section is devoted to Knight's rea…
Two minds that never met: Frank H. knight on john M. keynes once again — A documentary note
2016
This note presents new archival evidence about Frank H. Knight’s views on John M. Keynes. The relevant material is composed of a series of lecture notes taken by Perham C. Nahl in Frank H. Knight’s course on Business Cycles at the University of California at Berkeley in the fall of 1936. It emerges from the notes that the methodological gap between Keynes and Knight was irreducible, which explains the harsh tone of Knight’s published review of The General Theory. Connected to this is Knight’s strenuous defense of the ‘postulates of classical political economy’ as criticized by Keynes in chapter 2 of his book, an argument that was better expounded in the classroom than in the review. However…
Wavelet analysis of human photoreceptoral response
2010
Feature detection of biomedical signals is crucial for deepening our knowledge of the physiological phenomena giving rise to them. To achieve this aim, even if many analytic approaches have been suggested only few are able to deal with signals whose features are time dependent, and to provide useful clinical information. In this work we use the wavelet analysis to extract peculiarities of the early response of the photoreceptoral human system, known as a-wave ERG-component. The analysis of the a-wave features is important since this component reflects the functional integrity of the two populations of photoreceptors, rods and cones whose activation dynamics are not well known. Moreover, in …
Functional analysis of Normal and CSNB a-wave ERG component
2009
The features of a-wave of the human electroretinogram are one of the more debated problems in electrophysiology since the a-wave reflects the functional integrity of the two photoreceptoral populations (rods and cones). Although different models concerning the contributions of the early photoreceptoral response are available in current literature, a fully comprehensive theory is difficult to formulate because of the large amount of individual photoreceptors. We study the kinetics of the photoreceptoral response through the analysis of the a-wave shape both in healthy and in patients affected by the Congenital Stationary Night Blindness, that interests the rod population only. The physiologi…
Frank H. Knight on social values in economic consumption: an archival note
2020
We reproduce an unpublished address on “Social Values in Economic Consumption” which Knight prepared for a SSRC Conference in June 1931. This material sheds new light on Knight in two respects. First, anticipating what is known as the relative income hypothesis, Knight indicated that a general increase in income, not only leaves the individual’s relative position in society unaltered but makes her/his situation worse off due to the peculiar characteristics of the market for “personal services.” Second, this address provides further evidence of how, in spite of some substantial methodological differences, Knight’s research interests converged with those of the institutionalists.