We investigate Rydberg |65D_(5/2)> → |66P_(3/2)> superradiance in dense ultracold cesium atoms,where the ground atoms are excited to |65D_(5/2)> Rydberg states via two-photon excitation in a standard magneto...We investigate Rydberg |65D_(5/2)> → |66P_(3/2)> superradiance in dense ultracold cesium atoms,where the ground atoms are excited to |65D_(5/2)> Rydberg states via two-photon excitation in a standard magneto-optical trap.The superradiant spectrum of |65D_(5/2)> → |66P_(3/2)> is obtained using the state-selective field ionization technique.We observe its dynamic evolution process by varying the delay time of ionization field td.The results show that the evolution process of |65D_(5/2)> →|66P_(3/2)> is much shorter than its radiation lifetime at room temperature,which verifies the superradiance effect.The dependence of the superradiance process on Rydberg atoms number N_(e) and principal quantum number n is investigated.The results show that the superradiance becomes faster with increasing N_(e),while it is suppressed for stronger van der Waals(vdW) interactions.Superradiance has potential applications in quantum technologies,and the Rydberg atom is an ideal medium for superradiance.Our system is effective for studying the strong two-body interaction between Rydberg atoms.展开更多
The myostatin gene, a member of the transforming growth factor-beta (TGF-β) surperfamily, is a negative regulatory factor of skeletal muscle growth. A series of experiments were carried out by the RT-PCR method to pr...The myostatin gene, a member of the transforming growth factor-beta (TGF-β) surperfamily, is a negative regulatory factor of skeletal muscle growth. A series of experiments were carried out by the RT-PCR method to probe the difference of mRNA expression of porcine myostatin gene in three muscular tissues, namely skeletal muscle, heart muscle and stomach smooth muscle. mRNA expression was found in all muscular tissues. mRNA expression in skeletal muscle and heart muscle was more active than in the stomach smooth muscle. This discovery is of significance to getting further into the biological function of myostatin gene, and to directing the animal breeding at molecular level as well.展开更多
基金Project supported by the Fundamental Research Program of Shanxi Province,China(Grant Nos.202203021212018 and 202203021212405)the National Nature Science Foundation of China(Grant Nos.12104337 and 12204292)the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi,China(Grant No.2022L268)。
文摘We investigate Rydberg |65D_(5/2)> → |66P_(3/2)> superradiance in dense ultracold cesium atoms,where the ground atoms are excited to |65D_(5/2)> Rydberg states via two-photon excitation in a standard magneto-optical trap.The superradiant spectrum of |65D_(5/2)> → |66P_(3/2)> is obtained using the state-selective field ionization technique.We observe its dynamic evolution process by varying the delay time of ionization field td.The results show that the evolution process of |65D_(5/2)> →|66P_(3/2)> is much shorter than its radiation lifetime at room temperature,which verifies the superradiance effect.The dependence of the superradiance process on Rydberg atoms number N_(e) and principal quantum number n is investigated.The results show that the superradiance becomes faster with increasing N_(e),while it is suppressed for stronger van der Waals(vdW) interactions.Superradiance has potential applications in quantum technologies,and the Rydberg atom is an ideal medium for superradiance.Our system is effective for studying the strong two-body interaction between Rydberg atoms.
文摘The myostatin gene, a member of the transforming growth factor-beta (TGF-β) surperfamily, is a negative regulatory factor of skeletal muscle growth. A series of experiments were carried out by the RT-PCR method to probe the difference of mRNA expression of porcine myostatin gene in three muscular tissues, namely skeletal muscle, heart muscle and stomach smooth muscle. mRNA expression was found in all muscular tissues. mRNA expression in skeletal muscle and heart muscle was more active than in the stomach smooth muscle. This discovery is of significance to getting further into the biological function of myostatin gene, and to directing the animal breeding at molecular level as well.
