Abstract: In this study, a double-layer structured paper-based electrochemical biosensor was developed for the simultaneous detection of aflatoxin B1 (AFB1) and ochratoxin A (OTA). Microelectrodes ...
Present continuous and 'going to' Verb patterns The present perfect with ‘ever’ and ‘never’ The present perfect with 'for' and 'since' Comparatives and superlatives The present perfect with 'just', ...
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