physical-chemical factor meaning in English

物理化学因素
物理化学因子

Impact of physical - chemical factors on the artificial seed breeding anadara brojughtoni
各种理化因子对魁蚶人工育苗的影响
The callus was induced and proliferated using young leave as explant , which comes out at early spring . in this paper , the author discussed the induction effect and the proliferation effect by using different kinds of hormone and different physical - chemical factors
本文以山茶初春新生枝条的幼叶为外植体，采用不同的培养基，探讨了不同的植物生长调节物质对愈伤组织的诱导和不同的理化因子对愈伤组织的增殖效应。
After asthma patients ' respiratory tract suffering the allergy sources or other physical - chemical factors stimulation , they will create overactive reaction to cause the spasm of respiratory tract ' s smooth muscle , membrane oedema , mucus over secrete which narrow the respiratory tract and cause the asthma syndrome like coughing , breathe heavily and breathing difficulty
气喘患者的呼吸道在受到过敏原或其他的物理化学因子刺激后，产生过度激烈的反应，使呼吸道的平滑肌发生痉孪，粘膜水肿，粘液分泌过多，致呼吸道管径变小，而产生咳嗽，喘呜，呼吸困难的气喘症状。