Screening and optimization of extracellular pectinase produced by Bacillus thuringiensis SH7 oleh Umar Maria, Rehman Aneela, Khan Ibrar, Hayat Palwasha, Hayat Azam, Rehman Mujaddad Ur, Shah Tawaf Ali, Dawoud Turki M., Hadrach Safaa, Bourhia Mohammed