A modification request is required if you plan to make any changes to your research or deviate from the protocol after approval or exemption has been granted. Such changes include, but are not limited ...

To find out a rapid and reliable procedure for estimating soil available nitrogen (N), the standard alkaline-permanganate extraction and its modification to include soil NO₃ were evaluated. The N ...

The Nature Index 2025 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their output in ...