41. Use of purified lanthanum also allowed usage of a much smaller amount of material in the tests themselves. 42. The converters use rare earth metals, oxides such as cerium and lanthanum , that are plentiful in China. 43. Chemically, actinium is similar to lanthanum , which is explained by their similar ionic radii and electronic structure. 44. Berkelium metal can also be produced by the reduction of berkelium ( IV ) oxide with thorium or lanthanum . 45. Lanthanum acts at the same modulatory site on the GABA receptor as zinc, a known negative allosteric modulator.46. The oxide is reduced to metal by heating with lanthanum , aluminium, cerium or zirconium in high vacuum. 47. However borate glass with more than 20 mol . % of lanthanum oxide is very durable under ambient conditions. 48. Large amounts of radioactive lanthanum were dispersed by the explosions; 254 tests were performed between 1944 and 1961. 49. I know that the specific method I have to use takes into account the position of Lanthanum and Actinium. 50. LSAT is a hard, optically transparent ceramic oxide of the elements lanthanum , aluminum, strontium and tantalum.
