1,547 research outputs found
OPTIMAL WEIGHT AND DIALYSIS DOSE IN PATIENTS ON PERIODIC HEMODIALYSIS
Small patients tend to be better dialyzed than large ones. We analyzed the delivered dose of dialysis in two groups of patients - group A, body weight over 50 kg (n-39, m:f=28:l; 57,4 8,3 kg) and group B, body weight under 50 kg (n=15, m:f=6:9; 45,4 3,4 kg). We calculated KT/V and Time Average Concentration of urea (TAC) using two-pool method for urea kinetic modeling. The patients from group Ð’ had a higher KT/V urea =1,35 0,25 (p < 0,05) and lower TAC =13,7 2,72 (p < 0,05) with a shorter dialysis time. Mean serum protein and albumin levels for a year did not differ
Connection between orbital modulation of H-alpha and gamma-rays in the Be/X-ray binary LSI+61303
We studied the average orbital modulation of various parameters (gamma-ray
flux, H-alpha emission line, optical V band brightness) of the radio- and
gamma-ray emitting Be/X-ray binary LSI+61303. Using the Spearman rank
correlation test, we found highly significant correlations between the orbital
variability of the equivalent width of the blue hump of the H-alpha and
Fermi-LAT flux with a Spearman p-value 2e-5, and the equivalent widths ratio
EW_B/EW_R and Fermi-LAT flux with p-value 9e-5. We also found a significant
anti-correlation between Fermi-LAT flux and V band magnitude with p-value
7.10^{-4}.
All these correlations refer to the average orbital variability, and we
conclude that the H-alpha and gamma-ray emission processes in LSI+61303 are
connected. The possible physical scenario is briefly discussed.Comment: accepted as a Letter in Astronomy and Astrophysic
Application of cellular automaton in production expert system
The possibility of applying cellular automaton in production expert systems has been studied. For industrial expert systems having knowledge bases of several thousands rules, using cellular automaton as inference machines opens the possibility to increase the operating efficiency with knowledge base
Spectral observations of X Persei: Connection between H-alpha and X-ray emission
We present spectroscopic observations of the Be/X-ray binary X Per obtained
during the period 1999 - 2018. Using new and published data, we found that
during "disc-rise" the expansion velocity of the circumstellar disc is 0.4 -
0.7 km/s. Our results suggest that the disc radius in recent decades show
evidence of resonant truncation of the disc by resonances 10:1, 3:1, and 2:1,
while the maximum disc size is larger than the Roche lobe of the primary and
smaller than the closest approach of the neutron star. We find correlation
between equivalent width of H-alpha emission line () and the X-ray
flux, which is visible when . The
correlation is probably due to wind Roche lobe overflow.Comment: Accepted for publication in Astronomy & Astrophysic
Fabrication of living soft matter by symbiotic growth of unicellular microorganisms
We report the fabrication of living soft matter made as a result of the symbiotic relationship of two unicellular microorganisms. The material is composed of bacterial cellulose produced in situ by acetobacter (Acetobacter aceti NCIMB 8132) in the presence of photosynthetic microalgae (Chlamydomonas reinhardtii cc-124), which integrates into a symbiotic consortium and gets embedded in the produced cellulose composite. The same concept of growing living materials can be applied to other symbiotic microorganism pairs similar to the combination of algae and fungi in lichens, which is widespread in Nature. We demonstrate the in situ growth and immobilisation of the C. reinhardtii cells in the bacterial cellulose matrix produced by the simultaneous growth of acetobacter. The effect of the growth media composition on the produced living materials was investigated. The microstructure and the morphology of the produced living biomaterials were dependent on the shape of the growth culture container and media stirring conditions, which control the access to oxygen. As the photosynthetic C. reinhardtii cells remain viable and produce oxygen as they spontaneously integrate into the matrix of the bacterial cellulose generated by the acetobacter, such living materials have the potential for various applications in bio-hydrogen generation from the immobilised microalgae. The proposed approach for building living soft matter can provide new ways of immobilising other commercially important microorganisms in a bacterial cellulose matrix as a result of symbiosis with acetobacter without the use of synthetic binding agents and in turn increase their production efficiency
Optical spectroscopy and X-ray observations of the D-type symbiotic star EF Aql
We performed high-resolution optical spectroscopy and X-ray observations of
the recently identified Mira-type symbiotic star EF Aql. Based on
high-resolution optical spectroscopy obtained with SALT, we determine the
temperature (55 000 K) and the luminosity ( 5.3 ) of the
hot component in the system. The heliocentric radial velocities of the emission
lines in the spectra reveal possible stratification of the chemical elements.
We also estimate the mass-loss rate of the Mira donor star. Our Swift
observation did not detect EF Aql in X-rays. The upper limit of the X-ray
observations is 10 erg cm s, which means that EF Aql is
consistent with the faintest X-ray systems detected so far. Otherwise we
detected it with the UVOT instrument with an average UVM2 magnitude of 14.05.
During the exposure, EF Aql became approximately 0.2 UVM2 magnitudes fainter.
The periodogram analysis of the V-band data reveals an improved period of
320.40.3 d caused by the pulsations of the Mira-type donor star. The
spectra are available upon request from the authors.Comment: Accepted for publication in MNRA
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