2,373 research outputs found
Mid-infrared spectrally-pure single-photon states generation from 22 nonlinear optical crystals
We theoretically investigate the preparation of pure-state single-photon
source from 14 birefringent crystals (CMTC, THI, LiIO, AAS, HGS, CGA, TAS,
AGS, AGSe, GaSe, LIS, LISe, LGS, and LGSe) and 8 periodic poling crystals (LT,
LN, KTP, KN, BaTiO, MgBaF, PMN-0.38PT, and OP-ZnSe) in a wavelength
range from 1224 nm to 11650 nm. The three kinds of group-velocity-matching
(GVM) conditions, the phase matching conditions, the spectral purity, and the
Hong-Ou-Mandel interference are calculated for each crystal. This study may
provide high-quality single-photon sources for quantum sensing, quantum
imaging, and quantum communication applications at the mid-infrared wavelength
range.Comment: 11 pages, 5 figure
Honeybee (Apis mellifera) Maternal Effect Causes Alternation of DNA Methylation Regulating Queen Development
Queen-worker caste dimorphism is a typical trait for honeybees (Apis mellifera). We previously showed a maternal effect on caste differentiation and queen development, where queens emerged from queen-cell eggs (QE) had higher quality than queens developed from worker cell eggs (WE). In this study, newly-emerged queens were reared from QE, WE, and 2-day worker larvae (2L). The thorax size and DNA methylation levels of queens were measured. We found that queens emerging from QE had significantly larger thorax length and width than WE and 2L. Epigenetic analysis showed that QE/2L comparison had the most different methylated genes (DMGs, 612) followed by WE/2L (473), and QE/WE (371). Interestingly, a great number of DMGs (42) were in genes belonging to mTOR, MAPK, Wnt, Notch, Hedgehog, FoxO, and Hippo signaling pathways that are involved in regulating caste differentiation, reproduction and longevity. This study proved that honeybee maternal effect causes epigenetic alteration regulating caste differentiation and queen development
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