2,811 research outputs found
Two body final states production in electron-positron annihilation and their contributions to
In this paper, we study the processes of annihilation into two
body final states, either two pseudoscalar mesons or one meson with a photon.
The hadronic vacuum polarization form factors are calculated within the
framework of resonance chiral theory in the energy region of
GeV, with final state interactions taken into account. A joint analysis on the
processes of , ,
, , and has been performed, and
the latest experimental data are included. Based on the vacuum polarization
form factors of these processes, we estimate their contributions to the lowest
order of anomalous magnetic moment of the muon, . Combined with
other contributions from hadronic vacuum polarization and other interactions
from the standard model, the discrepancy between theoretical prediction and
experimental measurement is , i.e.,
4.5.Comment: 45 pages, 6 figures, to be the same as the published versio
Standard metabolic rate predicts growth trajectory of juvenile Chinese crucian carp (Carassius auratus) under changing food availability
Phenotypic traits vary greatly within populations and can have a significant influence on aspects of performance. The present study aimed to investigate the effects of individual variation in standard metabolic rate (SMR) on growth rate and tolerance to food-deprivation in juvenile crucian carp (Carassius auratus) under varying levels of food availability. To address this issue, 19 high and 16 low SMR (individuals were randomly assigned to a satiation diet for 3 weeks, whereas another 20 high and 16 low SMR individuals were assigned to a restricted diet (approximately 50% of satiation) for the same period. Then, all fish were completely food-deprived for another 3 weeks. High SMR individuals showed a higher growth rate when fed to satiation, but this advantage of SMR did not exist in food-restricted fish. This result was related to improved feeding efficiency with decreased food intake in low SMR individuals, due to their low food processing capacity and maintenance costs. High SMR individuals experienced more mass loss during food-deprivation as compared to low SMR individuals. Our results here illustrate context-dependent costs and benefits of intraspecific variation in SMR whereby high SMR individuals show increased growth performance under high food availability but had a cost under stressful environments (i.e., food shortage)
(E)-1-[(2-Chloro-5-methylÂpyridin-3-yl)methylÂene]thiosemicarbazide
The title compound, C8H9ClN4S, which has potential insecticidal activity, was synthesized by the reaction of 2-chloro-5-methylÂnicotinaldehyde and thioÂsemicarbazide. In the crystal structure, the molÂecules are linked via interÂmolecular N—H⋯N, N—H⋯S and N—H⋯Cl hydrogen bonds, forming a three-dimensional network stacked down a
Transcriptional regulation of PIN genes by FOUR LIPS and MYB88 during Arabidopsis root gravitropism
PIN proteins are auxin export carriers that direct intercellular auxin flow and in turn regulate many aspects of plant growth and development including responses to environmental changes. The Arabidopsis R2R3-MYB transcription factor FOUR LIPS (FLP) and its paralogue MYB88 regulate terminal divisions during stomatal development, as well as female reproductive development and stress responses. Here we show that FLP and MYB88 act redundantly but differentially in regulating the transcription of PIN3 and PIN7 in gravity-sensing cells of primary and lateral roots. On the one hand, FLP is involved in responses to gravity stimulation in primary roots, whereas on the other, FLP and MYB88 function complementarily in establishing the gravitropic set-point angles of lateral roots. Our results support a model in which FLP and MYB88 expression specifically determines the temporal-spatial patterns of PIN3 and PIN7 transcription that are closely associated with their preferential functions during root responses to gravity
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