Abstract: A fluoroberyllium borate non-linear optical single crystal is represented by a molecular formula of MBe2BO3F2, wherein M is Rb or Cs. The crystal can be grown by the flux method comprising the steps of mixing a fluoroberyllium borate compound and a flux in proportion, heating the mixture up to 750-800° C., keeping at this temperature and then cooling it to the temperature of 2-10° C. above the saturating point to obtain a fluoroberyllium borate solution at high temperature; putting the seed crystal fixed on the end of a crystal hanging bar into the fluoroberyllium borate solution at high temperature, rotating the crystal hanging bar, cooling the melt solution to its saturating point, then cooling it again slowly, pulling the obtained crystal out of the solution surface, cooling it to room temperature, then obtaining the present fluoroberyllium borate non-linear optical crystal.

Abstract: A fluoroberyllium borate non-linear optical single crystal is represented by a molecular formula of MBe2BO3F2, wherein M is Rb or Cs. The crystal can be grown by the flux method comprising the steps of mixing a fluoroberyllium borate compound and a flux in proportion, heating the mixture up to 750-800° C., keeping at this temperature and then cooling it to the temperature of 2-10° C. above the saturating point to obtain a fluoroberyllium borate solution at high temperature; putting the seed crystal fixed on the end of a crystal hanging bar into the fluoroberyllium borate solution at high temperature, rotating the crystal hanging bar, cooling the melt solution to its saturating point, then cooling it again slowly, pulling the obtained crystal out of the solution surface, cooling it to room temperature, then obtaining the present fluoroberyllium borate non-linear optical crystal.

Abstract: A beryllium borate fluoride salt nonlinear optical crystal is represented by molecule formula Mbe2BO3F2, wherein M is Rb or Cs. The crystal is grown by melt salt method, comprising the following step, mixing beryllium borate fluoride salt with flux at appropriate ratio, rising to 750-800° C., and keeping at constant temperature, then cooling to 2-10° C. higher than saturated temperature to obtain a elevated solution; putting seed crystal on seed crystal pole into the elevated solution, rotating the seed crystal pole, cooling to saturated temperature, and then cooling slowly; raising the obtained crystal above liquid level and cooling to room temperature, then obtaining the present nonlinear optical crystal. The crystal has nonlinear optical effect, broad transmittance wave, adsorption edge of ultraviolet lower to 150 nm, doesn't deliquesce, isn't soluble to diluted hydrochloric acid and nitric acid, and has good chemical resistance.

Abstract: DNA isolates coding for sialyltransferase which contain a conserved region of homology and methods of obtaining such DNA are provided, together with expression systems for recombinant production of sialyltransferase.

Abstract: DNA isolates coding for sialyltransferase which contain a conserved region of homology and methods of obtaining such DNA are provided, together with expression systems for recombinant production of the various sialyltransferases.