81 research outputs found
Image Analysis of Eccentric Photorefraction
This article deals with image and data analysis of the recorded video-sequences of strabistic infants. It describes a unique noninvasive measuring system based on two measuring methods (position of I. Purkynje image with relation to the centre of the lens and eccentric photorefraction) for infants. The whole process is divided into three steps. The aim of the first step is to obtain video sequences on our special system (Eye Movement Analyser). Image analysis of the recorded sequences is performed in order to obtain curves of basic eye reactions (accommodation and convergence). The last step is to calibrate of these curves to corresponding units (diopter and degrees of movement)
Flavour formation in continuous fermentations
Fundação para a Ciência e a Tecnologia (FCT
Continuous beer fermentation using immobilized yeast cell bioreactor systems
Traditional beer fermentation and maturation processes use open fermentation and
lager tanks. Although these vessels had previously been considered indispensable,
during the past decades they were in many breweries replaced by large production
units (cylindroconical tanks). These have proved to be successful, both providing
operating advantages and ensuring the quality of the final beer. Another promising
contemporary technology, namely, continuous beer fermentation using immobilized brewing yeast, by contrast, has found only a limited number of industrial applications.
Continuous fermentation systems based on immobilized cell technology, albeit initially
successful, were condemned to failure for several reasons. These include engineering
problems (excess biomass and problems with CO2 removal, optimization of operating
conditions, clogging and channeling of the reactor), unbalanced beer flavor (altered
cell physiology, cell aging), and unrealized cost advantages (carrier price, complex and
unstable operation). However, recent development in reactor design and understanding of immobilized cell physiology, together with application of novel carrier materials, could provide a new stimulus to both research and application of this promising technology.Fundação para a Ciência e a Tecnologia (FCT
Preliminary optimization study of alcohol-free beer production in a continuous immobilized cell reactor system
Grant Agency of the Czech Republi
Growth model and metabolic activity of brewing yeast biofilm on the surface of spent grains : a biocatalyst for continuous beer fermentation
In the continuous systems, such as continuous beer fermentation, immobilized cells
are kept inside the bioreactor for long periods of time. Thus an important factor in
the design and performance of the immobilized yeast reactor is immobilized cell
viability and physiology. Both the decreasing specific glucose consumption rate (Q_im)
and intracellular redox potential of the cells immobilized to spent grains during
continuous cultivation in bubble-column reactor implied alterations in cell physiology.
It was hypothesized that the changes of the physiological state of the immobilized
brewing yeast were due to the aging process to which the immobilized yeast are exposed
in the continuous reactor. The amount of an actively growing fraction (X_im_act) of the
total immobilized biomass (X_im) was subsequently estimated at approximately X_im_act = 0.12 g_IB g_Cˉ¹ (IB = dry immobilized biomass, C = dry carrier). A mathematical model
of the immobilized yeast biofilm growth on the surface of spent grain particles based
on cell deposition (cell-to-carrier adhesion and cell-to-cell attachment), immobilized
cell growth, and immobilized biomass detachment (cell outgrowth, biofilm abrasion)
was formulated. The concept of the active fraction of immobilized biomass (X_im_act) and
the maximum attainable biomass load (X_im_max) was included into the model. Since the
average biofilm thickness was estimated at ca. 10 μm, the limitation of the diffusion
of substrates inside the yeast biofilm could be neglected. The model successfully
predicted the dynamics of the immobilized cell growth, maximum biomass load, free
cell growth, and glucose consumption under constant hydrodynamic conditions in a
bubble-column reactor. Good agreement between model simulations and experimental
data was achieved.Fundação para a Ciência e a Tecnologia (FCT) - SFRH/BPD/3541/2000
Sensorial evaluation of continuously fermented beer and the role of process parameters in adjusting its flavour profile
Although traditional batch overwhelmingly prevails over continuous fermentation, a
breakthrough in quality and savings could be achieved by a simple, flexible and cheap
fermentation system. This work deals with a complete continuous beer fermentation
consisting of an airlift and a packed-bed reactor containing yeast immobilized on
spent grains and corncobs, respectively. The goal was to study the influence of
process parameters on bioreactor performance and flavour profile of beer. Consumers
considered the continuously fermented beer to be of a regular quality. The possibility
of flavour adjustments by changing the process parameters was proved by a panel of
experienced tasters.Fundação para a Ciência e a Tecnologia (FCT) - SFRH/BPD/3541/2000.MŠMT - MSM 6046137305, Czech Republic.Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP).UNICER S.A
The annual recurrence risk model for tailored surveillance strategy in patients with cervical cancer
Purpose:
Current guidelines for surveillance strategy in cervical cancer are rigid, recommending the same strategy for all survivors. The aim of this study was to develop a robust model allowing for individualised surveillance based on a patient's risk profile.
Methods:
Data of 4343 early-stage patients with cervical cancer treated between 2007 and 2016 were obtained from the international SCCAN (Surveillance in Cervical Cancer) consortium. The Cox proportional hazards model predicting disease-free survival (DFS) was developed and internally validated. The risk score, derived from regression coefficients of the model, stratified the cohort into significantly distinctive risk groups. On its basis, the annual recurrence risk model (ARRM) was calculated.
Results:
Five variables were included in the prognostic model: maximal pathologic tumour diameter; tumour histotype; grade; number of positive pelvic lymph nodes; and lymphovascular space invasion. Five risk groups significantly differing in prognosis were identified with a five-year DFS of 97.5%, 94.7%, 85.2% and 63.3% in increasing risk groups, whereas a two-year DFS in the highest risk group equalled 15.4%. Based on the ARRM, the annual recurrence risk in the lowest risk group was below 1% since the beginning of follow-up and declined below 1% at years three, four and >5 in the medium-risk groups. In the whole cohort, 26% of recurrences appeared at the first year of the follow-up, 48% by year two and 78% by year five.
Conclusion:
The ARRM represents a potent tool for tailoring the surveillance strategy in early-stage patients with cervical cancer based on the patient's risk status and respective annual recurrence risk. It can easily be used in routine clinical settings internationally
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