1,720,996 research outputs found
Robust eigenvalue assignment by periodic feedback
No full textAvailable on: http://dspace.dml.cz/bitstream/handle/10338.dmlcz/125272/Kybernetika_31-1995-6_11.pd
Microbial inactivation and drying of strawberry slices by supercritical CO2
Full text linkThis work explores the feasibility to apply supercritical carbon dioxide (scCO2) to dry and increase the microbial safety of strawberries. Strawberry slices were dried at 10 MPa and 40 °C up to 6 h. The treatment was able to remove the 98% of the initial moisture content, corresponding to a weight loss of 90%. The method showed a limited inactivation power towards total mesophilic bacteria, while yeasts and moulds were under the detection limit of the technique (<10 log CFU/g). The process is efficient against different strains of pathogens (E. coli O157:H7, Salmonella spp. and L. monocytogenes), which were inoculated on the sample surface. Results highlight the potential of scCO2 drying as innovative food drying technology for the simultaneous drying and stabilization of the product without the use of high temperatures
DOXAZOSIN IN THE TREATMENT OF HYPERTENSION IN PATIENTS WITH CHRONIC OBSTRUCTIVE PULMONARY-DISEASE
No full textThis study evaluated the effects of doxazosin, a new alpha-1-adrenergic inhibitor, on blood pressure and pulmonary volumes and flows in ten patients (eight men and two women; age range, 53 to 66 years) with essential hypertension and concomitant chronic obstructive pulmonary disease (COPD). The single-blind study was conducted for 14 weeks and subdivided into three phases: placebo, titration, and maintenance phases. Patients first received placebo for four weeks, followed by active treatment with doxazosin 1 mg/day; this dose was increased to 2, 4, and 8 mg/day, depending on response. Systolic and diastolic blood pressures were significantly reduced by treatment with doxazosin after 14 weeks in the supine and standing positions. There were no significant changes in heart rate or urinary and plasmatic catecholamines. The ventilatory function parameters showed only a slight (but not statistically significant) improvement compared with the placebo phase. These results indicate that treatment with doxazosin significantly reduced systolic and diastolic blood pressure values without a change in the respiratory function tests, in patients with essential hypertension and concomitant COPD
Supercritical CO2 Pasteurization of Solid Products: a Case Study on Fresh-cut Potatoes
Full text linkDuring the last decades, supercritical carbon dioxide (scCO2) pasteurization has been intensively studied as a
potential technology to increase the safety and shelf-life of fresh food. However, the high risk of post-process
contamination still represents a barrier to its industrialization.
This study reports a proof of concept study in order to demonstrate the applicability of a novel method that
combines scCO2 and Modified Atmosphere Packaging (MAP) for fresh-cut potatoes. The process was
investigated by a full-factorial design of experiment, studying the effect of temperature (35 - 45 °C), pressure (8
– 12 MPa), and treatment time (5 – 35 min) on the microbial inactivation of E. coli and the color of the processed
product. The method was able to reduce up to 1.50 Log CFU/g the load of inoculated E. coli at 45°C, 8.0 MPa
and 35 min, without excessively modifying the product color. Moreover, the color did not significantly change during storage at 4 °C for 7 days
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
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