isolate Primary screening (diameter of xylan digestion zone, mm) Secondary screening (Uml-1) Esraa 300097 Esraa 300197 Esraa 300297 Esraa 300397 Esraa 300497 Esraa 300597 Esraa 300697 Esraa 300797 Esraa 300897 Esraa 300997 Esraa 301097 Esraa 301197 Esraa 301297 Esraa 301397 Esraa 301497 Esraa 301597 Esraa 301697 Esraa 301797 Esraa 301897 Esraa 301997 Esraa 302097 29 34 31 30 26 25 27 30 30 34 35 26 28 27 26 33 32 35 27 30 35 38.96 45.08 43.15 42.21 38.49 31.57 35.00 40.12 39.75 45.04 52.06 34.73 39.00 33.98 30.00 40.19 40.00 45.90 36.43 40.18 48.00

Table 2: Xylanase activity (Uml-1) of hyper xylanolytic endophytic actinobacteria after primary and secondary screening at 30°C for 5 days in selective xylan medium.