48 research outputs found
Guidelines for the rail grade selection
Over the years the rail steel manufacturing process and quality of material produced have improved significantly through alloy design and/or head treatment procedure. The objective of this paper is to give the recommendations for the application of the available rail steel grades in accordance with the accessible investigations. The main source are the results of the Innotrack project in correlation with Euronorm prEN 13674-1. The conclusion for the Serbian Railway is made
Antimicrobial activity of essential oils against Listeria monocytogenes
Food poisoning caused by Listeria monocytogenes leads to a 30% rate of mortality among patients. The application of essential oils (EOs) to food products is a suitable strategy to control pathogens and to extend their shelf life by reducing microbial levels. The objective of this study was to evaluate the antimicrobial potential of essential oils (EOs) against L. monocytogenes. The EOs used in this study were caraway (Carum carvi), cinnamon (Cinnamomum zeylanicum), dill (Anethum graveolens), clove (Syzygium aromaticum), mentha (Menthae piperitae aetheroleum), red thyme (Thymus vulgaris), rosemary (Rosmarinus officinalis), common sage (Salvia officinalis), clary sage (Salvia sclarea) and summer savory (Satureja hortensis). The minimal inhibitory concentrations (MICs) of EOs were determined using the broth microdilution method. According to the MIC values, all essential oils were effective in the inhibition of L. monocytogenes strains, with MICs varying from 256 Ī¼g/ml to 4096 Ī¼g/ml. The results showed that cinnamon EO had the highest antimicrobial activity, while dill and mentha EOs were the least effective against the L. monocytogenes. In addition, two different procedures were carried out to test the effect of antibiotics gentamycin and streptomycin against the L. monocytogenes strains, the broth microdilution method and the MIC Test Strip. Our results indicated that the reference strain L. monocytogenes ATCC 19111 was much more sensitive to antibiotics than L. monocytogenes strains isolated from meat, highlighting that gentamycin was the more effective in comparison to streptomycin
GASP XXVII: Gas-phase metallicity scaling relations in disk galaxies with and without ram-pressure stripping
Exploiting the data from the GAs Stripping Phenomena in galaxies with MUSE
(GASP) survey, we study the gas-phase metallicity scaling relations of a sample
of 29 cluster galaxies undergoing ram-pressure stripping and of a reference
sample of (16 cluster and 16 field) galaxies with no significant signs of gas
disturbance. We adopt the PYQZ code to infer the mean gas metallicity at the
effective radius and achieve a well-defined mass-metallicity relation (MZR) in
the stellar mass range with
a scatter of 0.12 dex. At any given mass, reference cluster and stripping
galaxies have similar metallicities, while the field galaxies with show on average lower gas metallicity than galaxies
in clusters. Our results indicate that at the effective radius the chemical
properties of the stripping galaxies are independent of the ram-pressure
stripping mechanism. Nonetheless, at the lowest masses we detect 4 stripping
galaxies well above the common MZR that suggest a more complex scenario.
Overall, we find signs of an anti-correlation between the metallicity and both
the star formation rate and the galaxy size, in agreement with previous
studies. No significant trends are instead found with the halo mass,
clustercentric distance and local galaxy density in clusters. In conclusion, we
advise a more detailed analysis of the spatially resolved gas metallicity maps
of the galaxies, able to highlight effects of gas redistribution inside the
disk due to the ram-pressure stripping.Comment: accepted for publication in ApJ, 24 pages, 21 figures, 2 table
FiziÄke karakteristike i nutritivni kvalitet odabranih genotipova kukuruza iz srbije razliÄitih u tvrdoÄi i boji zrna
Physical quality traits (1000-kernel weight, density, milling response and soft endosperm portion), basic chemical (starch, protein, oil, cellulose and ash) and amino acids composition of ten ZP maize genotypes differing in kernel hardness and colour were studied. The objectives of this study were to characterize differences in ZP maize genotypes regarding to various physical traits and nutritional quality parameters such as basic chemical and amino acid composition and the data was correlated to find the interrelationship between these parameters. Kernel physical traits and chemical composition significantly varied among tested genotypes. A significant negative correlation was found between protein content and portion of soft endosperm as well as a significant positive correlation between protein content and two physical traits, milling response and density. Protein content showed a non-significant negative correlation with starch content. The results showed that the protein content exhibited negative correlation with lysine as well as positive correlation with methionine. It has not been observed a significant improvement in the amino acid composition regarding the specialty genotypes such as the selected white and red kernels and popping maize genotypes. The information presented in this study could be useful for the utilization improvement of maize kernel and the development of maize-based ingredients to prepare nutritious feed and food products.Ispitivane su fiziÄke karakteristike zrna (apsolutna masa ili masa 1000 zrna, gustina, otpornost na mlevenje i udeo meke frakcije endosperma), osnovni hemijski sastav (sadržaj skroba, proteina, ulja, celuloze i pepela) i sastav aminokiselina kod 10 genotipova kukuruza razliÄitih po tvrdoÄi i boji zrna. Ciljevi ovog rada bili su da se izvrÅ”i karakterizacija ZP genotipova kukuruza u odnosu na razliÄite fiziÄke osobine i nutritivne parametre kvaliteta kao Å”to su osnovni hemijski i aminokiselinski sastav, i podaci potom korelacionom analizom obrade u cilju utvrÄivanja meÄuodnosa ovih parametara kvaliteta. FiziÄke osobine zrna i hemijski sastav znaÄajno su varirali izmeÄu ispitivanih genotipova. UtvrÄena je znaÄajna negativna korelacija izmeÄu sadržaja proteina i udela meke frakcije endosperma kao i znaÄajne pozitivne korelacije izmeÄu sadržaja proteina i dve fiziÄke osobine, otpornost na mlevenje i gustina zrna. Sadržaj proteina pokazao je negativnu korelaciju sa sadržajem skroba. Rezultati su pokazali da sadržaj proteina u zrnu ima negativnu korelaciju sa sadržajem lizina, kao i pozitivnu korelaciju sa sadržajem metionina. Nije utvrÄeno znaÄajno poboljÅ”anje sastava aminokiselina kod genotipova specifiÄnih svojstava, kao Å”to su genotipovi belog i crvenog zrna, i genotipovi kukuruza kokiÄara. Informacije predstavljene u ovom radu mogu biti korisne za poboljÅ”anje upotrebne vrednosti zrna kukuruza i razvoj komponenata na bazi kukuruza za hranu za životinje i prehrambene proizvode
Ethylendiamine-Tetra-Aceticacid (EDTA) Dependent Pseudothrombocytopenia Ā¬Screening and Confirmatory Testing
Ultraviolet imaging observations of three jellyfish galaxies: Star formation suppression in the centre and ongoing star formation in stripped tails
Spiral galaxies undergo strong ram-pressure effects when they fall into the
galaxy cluster potential. As a consequence, their gas is stripped to form
extended tails within which star formation can happen, giving them the typical
jellyfish appearance. The ultraviolet imaging observations of jellyfish
galaxies provide an opportunity to understand ongoing star formation in the
stripped tails. We report the ultraviolet observations of the jellyfish
galaxies JW39, JO60, JO194 and compare with observations in optical continuum
and . We detect knots of star formation in the disk and
tails of the galaxies and find that their UV and H flux are well
correlated. The optical emission line ratio maps of these galaxies are used to
identify for every region the emission mechanism, due to either star formation,
LINER or a mix of the two phenomena. The star-forming regions in the emission
line maps match very well with the regions having significant UV flux. The
central regions of two galaxies (JW39, JO194) show a reduction in UV flux which
coincides with composite or LINER regions in the emission line maps. The
galaxies studied here demonstrate significant star formation in the stripped
tails, suppressed star formation in the central regions and present a possible
case of accelerated quenching happening in jellyfish galaxies.Comment: Accepted for publication in MNRA
Metabolic Syndrome X ā High Risk Factor for Acute Myocardial Infarction and Its Complications
Metabolic Syndrome X is a clinical entity which comprises the following factors: diabetes
mellitus, arterial hypertension, high levels of triglyceride and/or low levels of
HDL cholesterol, central obesity and microalbuminuria (by WHO criteria). The first
goal of this study was to determine the frequency of the Metabolic Syndrome X (MSX) in
patients with acute myocardial infarction compared with the general population. The
second goal of the study was to examine the frequency of heart failure and reinfarction
rate in the patients with myocardial infarction, with and without MSX. Furthermore,
the relationship between gender and MSX was analyzed. A total of 101 patients with
acute myocardial infarction took part in randomized trial (32 women and 69 men).
MSX and all of its components were diagnosed according to WHO criteria. To determine
statistical significance of our results, we used 2 test and t-test for independent samples.
From 101 patient 48 had MSX (47.52%), while in the general population incidence of
MSX is 3ā4%. The reinfarction and the heart failure rate were significantly higher in
the group of patients with MSX (p = 0.0067 and p = 0.0217, respectively ). To conclude,
the results of the present study confirm that MSX is a high risk factor for myocardial infarction
and its complications