Under no rotating wave approximation and including the effect of dipole-dipole interaction between the atoms,exact squeezing properties for the output opticasl field and the atomic field are obtained.It is shown that ...Under no rotating wave approximation and including the effect of dipole-dipole interaction between the atoms,exact squeezing properties for the output opticasl field and the atomic field are obtained.It is shown that an atom laser keeping squeezed all the time can be generated.though the input optical field is at the coherent state or vacuum state.展开更多
N-acetyl-D-methionine, NaAc and the remains of N-acetyl-L-methionine dramatically affect the purification of L-methionine when purified from the mixture of enzymatically deacylated N-acetyl-DL-methionine, leading to a...N-acetyl-D-methionine, NaAc and the remains of N-acetyl-L-methionine dramatically affect the purification of L-methionine when purified from the mixture of enzymatically deacylated N-acetyl-DL-methionine, leading to a low yield conventionally. Here, this paper reports a successful separation and purification of both L-methionine and N-acetyl-D-methionine by an H ion-exchange column. The pH, L-Met concentration and the ratio between the content of sodium cation and the ion-exchange capacity were optimized to obtain the maximum yield. Experimental results indicate that, under the optimized conditions, the yields of L-methionine and N-acetyl-D-methionine can reach as high as 85% and 75%, respectively.展开更多
文摘Under no rotating wave approximation and including the effect of dipole-dipole interaction between the atoms,exact squeezing properties for the output opticasl field and the atomic field are obtained.It is shown that an atom laser keeping squeezed all the time can be generated.though the input optical field is at the coherent state or vacuum state.
文摘N-acetyl-D-methionine, NaAc and the remains of N-acetyl-L-methionine dramatically affect the purification of L-methionine when purified from the mixture of enzymatically deacylated N-acetyl-DL-methionine, leading to a low yield conventionally. Here, this paper reports a successful separation and purification of both L-methionine and N-acetyl-D-methionine by an H ion-exchange column. The pH, L-Met concentration and the ratio between the content of sodium cation and the ion-exchange capacity were optimized to obtain the maximum yield. Experimental results indicate that, under the optimized conditions, the yields of L-methionine and N-acetyl-D-methionine can reach as high as 85% and 75%, respectively.
