Sentence examples for it was hard to observe from inspiring English sources

Due to anti-DC-SIGN, TLR2, or TLR4 antibodies treatment alone blocked IL-10 production almost completely, therefore it was hard to observe the further enhanced effect when any antibody combination treatment was used.

It is hard to observe this production intensity directly.

This is partially due to the fact, that it is hard to observe it in situ.

It is therefore important to better understand the movement behaviour of these crabs, even though it is hard to observe directly.

It is hard to observe birds closely in their element, and that is why the market is so good among birders for binoculars and telescopes.

For many biologists, this implies that speciation happens so slowly that it's hard to observe on human timescales — that we'd need to track a population for millennia or more to actually see it split into two separate species.

However, it is hard to observe the changes on schedules in detail in an analytical way.

However, it is hard to observe such texture under SEM when the Si thin films are covered by CNTs (Figure 1d).

As bio-macromolecules are in nanoscale, it is hard to observe the working status of the proposed natural ESTs or traps in a living cell directly.

Therefore, it is hard to observe the filling effect of the localized exciton levels and the related large blueshift and narrowing of the PL peak.

Each quasar is thought to consume about one star per year, but in most cases, it's hard to observe the tidal debris from Earth, he says.