When a catalytically active enzyme forms a complex with a cofactor a holoenzyme is produced 酶蛋白和辅助因子两者结合成完整分子时，形成具有活力的全酶。
3.
The metal ion may be the catalytic center of the cofactor , or it may serve to bind the enzyme and substrate together to hold the enzyme in a catalytically active conformation 金属离子可以是辅助因素的催化中心，也可以帮助形成酶活性所必须的构象。
4.
The synthesis process of single - wall carbon nanotubes ( swnts ) by catalytically chemical vapor deposition ( ccvd ) was investigated and the product was characterized with transmission electron microscopy ( tem ) , electron diffraction ( ed ) , electron dispersive spectra ( eds ) and raman scattering spectra etc . pyrolysis of methane over solid catalysts prepared with impregnation , ion - adsorption precipitation , and sol - gel technique can all lead to the growth of swnts 本文研究了单壁纳米碳管的化学气相沉积法( cvd )制备工艺，并运用透射电子显微镜( tem ) 、 x - ray能谱( eds )与喇曼( raman )光谱等分析手段，对产物及催化剂进行了表征。采用浸渍法、吸附沉淀法与溶胶凝胶法等制备了催化剂，并合成了单壁纳米碳管。
5.
Low temperature plasma has been extensively investigated for catalyst preparation , including plasma chemical synthesis of ultra - fine particle catalysts , plasma regeneration or plasma treatment of catalysts , plasma - assisted deposition of catalytically active compounds on carriers and combination of plasma and catalyst in reaction system 摘要低温等离子体技术在化学生产中的用途越来越广泛，它在催化剂领域的应用主要表现在以下几个方面：超细颗粒催化剂合成，催化剂再生，催化剂表面处理，活性组分沉淀到基体以及低温等离子体系统中添加催化剂。
