Antibacterial Activity of a Novel Oligosaccharide from <i>Streptomyces californics</i> against <i>Erwinia carotovora</i> subsp. <i>Carotovora</i> oleh Maysoon Abdulrahman Al-Zubairy, Khaled Hussein, Salwa H. Alkhyat, Abdullah Yahya Al-Mahdi, Saeed Munassar Alghalibi, Adel Ali Al-Gheethi, Muhanna Mohammed Al-Shaibani, Hesham Ali El Enshasy, Nik Marzuki Sidik