It is generally not possible to observe groundwater recharge rates directly.
Because there is no colour or transmission contrast in such an object, it is not possible to observe the structure using a conventional optical microscope.
This definition is also often useful: sometimes it is not possible to observe whether two organisms interbreed (e.g., different types of whales in the wild) but examining their physical features can help determine how closely they're related.
Because of small size and complex structure of labyrinth-channel used in most drip emitters, it is not possible to observe the flow behavior of water passing through the channel.
A combined total of >480 ns of simulation data was collected which allowed us to study the conformational changes that were not possible to observe in the previously reported short-time molecular dynamics simulations.
A preliminary study based both on thermodynamic and experimental data showed that it is not possible to observe the Nd III)/Nd(0) system in LiF KF and LiF NaF melts; because the K+ and Na+ cation reduction waves hide the Nd3+ reduction wave.
The data provides details not possible to observe from satellites.
It was not possible to observe her directly from the main ward.
During this experiment, it was not possible to observe ethanol and acetaldehyde signals.
However, it was not possible to observe a proposal of solution in their report.
From the single blood sample drawn, it was not possible to observe the ongoing changes in biomarker levels.
