675 research outputs found
Effects of weather and other factors on milk production in the Churra dairy sheep breed
The objective of this study was to investigate the influence of meteorological and other factors on the quality and quantity of milk of the Spanish Churra sheep breed, based on an analysis of 359, 808 milk controls from 9, 904 ewes on 15 farms in 8 years. Daily milk yield (DMY), fat, protein, and lactose (%), and somatic cell count (SCC) data were obtained from monthly alternating milk controls. Mean, maximum, and minimum temperatures (T) (°C), mean relative humidity (RH) (%), wind speed (WS, m/s), mean solar radiation (SR, MJ/m2), and total rainfall (RF, mm) on the day before each milk control day were documented. Year, farm, number of lambing and stage of lactation, and all of the meteorological factors had a significant (P < 0.0001) effect on DMY and milk quality. DMY and SCC differed among seasons (P < 0.001), and maximum DMY and minimum SCC occurred in spring, and minimum DMY and maximum SCC occurred in autumn. Fat, protein, and lactose content differed significantly (P < 0.001) among seasons, and fat and protein contents were highest in autumn. DMY was highest in the second lambing of the ewe and steadily declined in subsequent lambings. SCC increased significantly from the first to the 10th lambing of the ewe. DMY, SCC, and fat content differed significantly (P < 0.001) among years. In conclusion, meteorological conditions had a significant effect on milk quality and production in Churra sheep conditions in a season-dependent manner such that factors such as temperature had the opposite effect on milk production in hot and cold seasons
Vibrational spectra of the α-MIIC2O4.2H2O oxalato complexes, with MII = Co, Ni, Zn
The infrared and Raman spectra of the α-MIIC2O4â
2H2O oxalate complexes with MII = Co, Ni and Zn were recorded and briefly discussed on the basis of their structural peculiarities. The IR spectrum of a partially deuterated sample of α-ZnC2O4â
2H2O is also discussed, reinforcing some of the performed assignments in the lower energy spectral region.Se registraron los espectros de infrarrojo y Raman de los oxalato-complejos α-MIIC2O4â
2H2O con MII = Co, Ni, Zn y se los discute brevemente en base a sus peculiaridades estructurales. Asimismo, se discute el espectro IR de una muestra parcialmente deuterada de α-ZnC2O4â
2H2O el que permitiĂł reforzar algunas de las asignaciones realizadas en la zona espectral de baja energĂa.Fil: Wladimirsky, Alejandra. Universidad TecnolĂłgica Nacional; ArgentinaFil: Palacios, Daniel. Universidad TecnolĂłgica Nacional; ArgentinaFil: D Antonio, MarĂa C.. Universidad TecnolĂłgica Nacional; Argentina. Universidad Nacional de la Patagonia Austral; ArgentinaFil: Gonzalez Baro, Ana Cecilia. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - La Plata. Centro de QuĂmica InorgĂĄnica "Dr. Pedro J. Aymonino". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de QuĂmica InorgĂĄnica "Dr. Pedro J. Aymonino"; ArgentinaFil: Baran, Enrique JosĂ©. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - La Plata. Centro de QuĂmica InorgĂĄnica "Dr. Pedro J. Aymonino". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de QuĂmica InorgĂĄnica "Dr. Pedro J. Aymonino"; Argentin
The Broad-Line and Narrow-Line Regions of the LINER NGC 4579
We report the discovery of an extremely broad H-alpha emission line in the
LINER nucleus of NGC 4579. From ground-based observations, the galaxy was
previously known to contain a Type 1 nucleus with a broad H-alpha line of FWHM
= 2300 km/s and FWZI ~ 5000 km/s. New spectra obtained with the Hubble Space
Telescope and a 0.2 arcsec-wide slit reveal an H-alpha component with FWZI ~
18,000 km/s. The line is not obviously double-peaked, but it does possess
shoulders on the red and blue sides which resemble the H-alpha profiles of
double-peaked emitters such as NGC 4203 and NGC 4450. This similarity suggests
that the very broad H-alpha profile in NGC 4579 may represent emission from an
accretion disk. Three such objects have been found recently in two HST programs
which have targeted a total of 30 galaxies, demonstrating that double-peaked or
extremely broad-line emission in LINERs must be much more common than would be
inferred from ground-based surveys. The ratio of the narrow [S II] 6716, 6731
lines shows a pronounced gradient indicating a steep rise in density toward the
nucleus. The direct detection of a density gradient within the inner arcsecond
of the narrow-line region confirms expectations from previous observations of
linewidth-critical density correlations in several LINERs.Comment: 8 pages, includes 3 figures. To appear in The Astrophysical Journa
Production, Processing, Commercialization and Analysis of Costumer Preferences of Sheep Cheese in Chile
The constant increase in the demand for dairy products and their derivatives has generated a higher consumption of dairy products (113.5 t/year). Chile has not been the exception; in 2017, it presented an average per capita consumption of 11.1 kg of cheese, making it the largest consumer in Latin America, followed by Argentina (7.5 kg) and Uruguay (5 kg). Although Chile does not have a strong tradition of consuming sheepâs milk cheese compared with other (European) countries, in recent years, there have been changes in the demands and expectations of cheese consumers, who demand higher quality and a wider range of varieties, thus establishing the potential for further products to enter the market. The global cheese industry has taken charge of these trends through the phenomenon of granting a premium value to certain products, adding new ingredients and flavors, producing limited editions of certain products, favoring traditional recipes and craft methods, and highlighting specific localities of origin. Given a greater appreciation for and popularity of locally produced cheeses and value-added products, particularly those with the highly valued âDesignation of Originâ label, this would offer a potential for expansion in the Chilean market
Milk production of lacaune sheep with different degrees of crossing with manchega sheep in a commercial flock in Spain
The objective of the present study was to evaluate the effect of the grade of crossbreeding (Lacaune x Manchega) and environmental factors on milk production in a commercial flock in Spain. A total of 5769 milk production records of sheep with different degrees of purity of the Lacaune breed crossed with Manchega were used as follows: 100% Lacaune (n = 2960), 7/8 Lacaune (n = 502), 13/16 Lacaune (n = 306), 3/4 (n = 1288), 5/8 Lacaune (n = 441) and 1/2 Lacaune: Manchega (n = 272). Additional available information included the number of parity (1 to 8), litter size (single or multiple), and the season of the year of lambing (spring, summer, autumn and winter). A mixed model was used to evaluate the level of crossbreeding and environmental factors on milk production. The 100% Lacaune sheep presented the highest milk production with respect to the F1 Lacaune x Manchega sheep (p < 0.01), showing that as the degree of gene absorption increases with the Manchega breed, it presents lower milk yield. The 100%, 13/16, and 3/4 Lacaune genotypes had the highest milk yields with respect to the 1/2 Lacaune/Manchega breed (p < 0.001). The Lacaune registered on average 181.1 L in a period adjusted to 160 days of lactation (1.13 L/ day). Likewise, the parity number, litter size, and season of lambing effects showed significant differences (p < 0.01). It was concluded that 13/16 and 3/4 Lacaune/Manchega ewes presented the highest milk yields with respect to the other crosses
Structural and Spectroscopic Behavior of double Metal Oxalates from the first transition Metal Series
A series of double metal oxalates of stoichiometry MMÂŽ(C2O4)2.4H2O (with MMÂŽ= MnCo, MnNi, MnZn, CoNi, CoCu, CoZn, NiCu, NiZn and CuZn have been prepared and characterized. Their structural behavior was investigated by means of X-ray powder diffractometry, showing a strong structural analogy to the orthorhombic, so-called beta-modification, of the related simple oxalato complexes of composition MC2O4.2H2O. The vibrational spectroscopic behavior of the double metal oxalates was investigated by infrared and Raman spectroscopy. The results clearly confirmed the close structural analogies between the MMÂŽ(C2O4)2.4H2O, alfa-MC2O4.2H2O and beta-MC2O4.2H2O series of complexes.Fil: DâAntonio, MarĂa C.. Universidad Nacional de la Patagonia Austral. Unidad AcadĂ©mica RĂo Gallegos; ArgentinaFil: Torres, MarĂa Marta. Universidad Nacional de la Patagonia Austral. Unidad AcadĂ©mica RĂo Gallegos; ArgentinaFil: Palacios, Daniel Alejandro. Universidad Nacional de la Patagonia Austral. Unidad AcadĂ©mica RĂo Gallegos; ArgentinaFil: Gonzalez Baro, Ana Cecilia. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - La Plata. Centro de QuĂmica InorgĂĄnica "Dr. Pedro J. Aymonino". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de QuĂmica InorgĂĄnica "Dr. Pedro J. Aymonino"; ArgentinaFil: Barone, Vicente Luis. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - La Plata. Centro de QuĂmica InorgĂĄnica "Dr. Pedro J. Aymonino". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de QuĂmica InorgĂĄnica "Dr. Pedro J. Aymonino"; ArgentinaFil: Baran, Enrique JosĂ©. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - La Plata. Centro de QuĂmica InorgĂĄnica "Dr. Pedro J. Aymonino". Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de QuĂmica InorgĂĄnica "Dr. Pedro J. Aymonino"; Argentin
OPserver: interactive online-computations of opacities and radiative accelerations
Codes to compute mean opacities and radiative accelerations for arbitrary
chemical mixtures using the Opacity Project recently revised data have been
restructured in a client--server architecture and transcribed as a subroutine
library. This implementation increases efficiency in stellar modelling where
element stratification due to diffusion processes is depth dependent, and thus
requires repeated fast opacity reestimates. Three user modes are provided to
fit different computing environments, namely a web browser, a local workstation
and a distributed grid.Comment: 5 pages, 1 figur
Effect of Lifestyle Intervention in the Concentration of Adipoquines and Branched Chain Amino Acids in Subjects with High Risk of Developing Type 2 Diabetes: Feel4Diabetes Study
Introduction: The global prevalence of type 2 diabetes (T2D) is increasing rapidly, especially in low- and middle-income countries and has a high number of associated comorbidities. Plasmatic concentrations of branched chain amino acids (BCAA) and retinol-binding protein 4 (RBP4) have been shown to be elevated in T2D subjects in cross-sectional studies. However, the effect of lifestyle community-based interventions on BCAA and RBP4 concentrations has not yet been analyzed.
Material and methods: The Feel4Diabetes study is a school and community-based intervention that identified 360 European families with a high risk of developing T2D according to the FINDRISC questionnaire. Families were randomized in control and intervention groups were followed-up from 2016 to 2018. In the Spanish families, the concentration of BCAA and RBP4 was determined in 266 subjects (115 control and 151 intervention group) that attended the three time-point assessments by colorimetric and ELISA reaction, respectively.
Results: Baseline BCAA levels showed positive correlations with the FINDRISC score and glucose impairment (baseline glucose, insulin, and glycated hemoglobin), body mass index, and body weight. The participants receiving the community-based intervention showed a significant decrease in glycated hemoglobin and BCAA levels compared to the control group (p = 0.011 and p < 0.001, respectively). However, baseline RBP4 did not show significant correlations with anthropometric and glycemic parameters, and no significant change was observed in anthropometric parameters and RBP4 concentrations throughout the follow-up.
Conclusion: A community-based intervention on lifestyle led to a significant reduction in BCAA levels regardless of weight loss. These findings suggest that this interventional approach could be promising in T2D prevention
Attosecond VUV Coherent Control of Molecular Dynamics
High harmonic light sources make it possible to access attosecond
time-scales, thus opening up the prospect of manipulating electronic wave
packets for steering molecular dynamics. However, two decades after the birth
of attosecond physics, the concept of attosecond chemistry has not yet been
realized. This is because excitation and manipulation of molecular orbitals
requires precisely controlled attosecond waveforms in the deep ultraviolet,
which have not yet been synthesized. Here, we present a novel approach using
attosecond vacuum ultraviolet pulse-trains to coherently excite and control the
outcome of a simple chemical reaction in a deuterium molecule in a non-Born
Oppenheimer regime. By controlling the interfering pathways of electron wave
packets in the excited neutral and singly-ionized molecule, we unambiguously
show that we can switch the excited electronic state on attosecond timescales,
coherently guide the nuclear wave packets to dictate the way a neutral molecule
vibrates, and steer and manipulate the ionization and dissociation channels.
Furthermore, through advanced theory, we succeed in rigorously modeling
multi-scale electron and nuclear quantum control in a molecule for the first
time. The observed richness and complexity of the dynamics, even in this very
simplest of molecules, is both remarkable and daunting, and presents intriguing
new possibilities for bridging the gap between attosecond physics and
attochemistry
Monte Carlo simulation with time step quantification in terms of Langevin dynamics
For the description of thermally activated dynamics in systems of classical
magnetic moments numerical methods are desirable. We consider a simple model
for isolated magnetic particles in a uniform field with an oblique angle to the
easy axis of the particles. For this model, a comparison of the Monte Carlo
method with Langevin dynamics yields new insight in the interpretation of the
Monte Carlo process, leading to the implementation of a new algorithm where the
Monte Carlo step is time-quantified. The numeric results for the characteristic
time of the magnetisation reversal are in excellent agreement with asymptotic
solutions which itself are in agreement with the exact numerical results
obtained from the Fokker-Planck equation for the Neel-Brown model.Comment: 5 pages, Revtex, 4 Figures include
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