The aim of the present study was to evaluate the different feeding frequencies on the performance, hematology profile, daily rhythms of glucose and activities digestive enzymes for juvenile ...Lophiosilurus alexandri. Feeding frequency did not affect survival, final weight, daily weight gain (P > .05). Glucose showed a daily rhythmic variation, with the acrophase in the group F2 located at Zeitgeber Time (ZT) 12.51 h and at ZT 13.33 h in the group F5. The daily rhythms in digestive enzymes were also affected, especially chymotrypsin, whose activity was twofold higher in F5 than F2. Food ratio divided into a higher frequency along the day induces an increase in acid protease and chymotrypsin activities. Different feeding frequencies can influence hematology profile, daily rhythms of glucose and activities digestive enzymes. The production of juvenile L. alexandri can be successfully carried out adopting a feeding frequency of twice a day.
Effect of environmental color on learning of Nile tilapia Torres, Isabela F. Araújo; Ferreira, Angélica da Silva; de Souza e Silva, Walisson ...
Applied animal behaviour science,
December 2018, 2018-12-00, 20181201, Letnik:
209
Journal Article
Recenzirano
•Environmental color may interfere with performance in learning tasks.•Black and green environments are the most suitable for maintenance and learning test.•Blue environment negatively impact ...individual performance in learning test.
This study investigates the effects of environmental color on learning capacity of Nile tilapia, Oreochromis niloticus. Eighty-four tilapia (12.81 ± 0.38 cm; 35.98 ± 8.33 g), were separated into six groups of fourteen and housed in blue, green and black tanks. The fish were acclimatized to their respective colored environment for 15 days. Learning tests were performed using T-mazes color-matched to the respective fish tank colors for 15 days. The fish were then tested in T-mazes of different colors from their tanks for another 5 days. The learning task involved exploring the maze in search of a reward (feed pellets) and associating a visual marker with the reward. Results showed that in color-matched mazes, the fish in black and green mazes required eleven days to learn the task (p < 0.0001), while those in the blue maze failed to learn the task (p = 0.101). All color changes affected fish performance at learning the task (blue p = 0.101; black and green p < 0.0001). Our results suggest that environmental color influences learning, with black and green environments being to be the most suitable for both maintenance and learning by Nile tilapia.
The present Compact Muon Solenoid Resistive Plate Chambers system has been worked efficiently during Run I and Run II of data taking period (Shah et al., 2020) 1. In the coming years of operation ...with the High Luminosity LHC (HL-LHC), the expected rate and integrated charge are expected to be about 600 Hz/cm2 and 840 mC/cm2, respectively (including a safety factor of three). Therefore, the HL-LHC phase will be a challenge for the RPC system since the expected operating conditions are much harsher than those for which the detectors have been designed, and could introduce non-recoverable aging effects which can alter the detector properties. A longevity test has been started at the CERN Gamma Irradiation Facility to estimate the impact of HL-LHC conditions on the RPC detector performance in order to determine whether the RPC system will survive the harsher background conditions expected at HL-LHC. The latest results of the irradiation test will be presented.
A search is presented for decays of
and Higgs bosons to a
meson and a photon, with the subsequent decay of the
to
. The analysis uses data from proton-proton collisions with an integrated luminosity ...of 35.9
at
collected with the CMS detector at the LHC. The observed limit on the
decay branching fraction, assuming that the
meson is produced unpolarized, is
at 95% confidence level, which corresponds to a rate higher than expected in the standard model by a factor of 15. For extreme-polarization scenarios, the observed limit changes from
to
with respect to the unpolarized scenario. The observed upper limit on the branching fraction for
where the
meson is assumed to be transversely polarized is
, a factor of 260 larger than the standard model prediction. The results for the Higgs boson are combined with previous data from proton-proton collisions at
to produce an observed upper limit on the branching fraction for
that is a factor of 220 larger than the standard model value.
CMS iRPC FEB development and validation Gouzevitch, M.; El Sawy, M.; Alves, G.A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
07/2024, Letnik:
1064
Journal Article
Recenzirano
Odprti dostop
In view of the High Luminosity upgrade of the CERN LHC, the forward CMS Muon spectrometer will be extended with two new stations of improved Resistive Plate Chambers (iRPC) covering the ...pseudorapidity range from 1.8 to 2.4. Compared to the present RPC system, the gap thickness is reduced to lower the avalanche charge, and an innovative 2D strip readout geometry is proposed. These improvements will allow iRPC detector to cope with higher background rates. A new Front-End-Board (FEB) is designed to readout iRPC signals with a threshold as low as 30fC and an integrated Time Digital Converter with a resolution of 30ps. In addition, the communication bandwidth is significantly increased by using optical fibers. The history, final design, certification, and calibration of this FEB are presented.
PDF
