A Multiplex Polymerase Chain Reaction Method for Rapid Detection of Foreign Genes in Insect-resistant Transgenic Populus nigra Strategies to Enhance Expression of Foreign Genes in Plants Study on the conditions of Cell Transformation in Astragalus sinicus Construction of Plant Expression Vector with Double Resistance to Virus and Insect and Identification of Transformation in Tomato Specific Detection of GM Maize Events Using Aldehyde PCR Chip Effect of Different Foreign Genes on the Heterosis in Upland Cotton Insect Resistance Selectivity of Transgenic Hybrid Poplar 741 A multiplex polymerase chain reaction method for rapid detection of foreign genes in transgenic birch (Betula platyphylla)