Sentences with phrase «without definitive tests»

However, without definitive tests of the CO2 - fertilisation effect on savanna trees, other factors can be invoked to explain widely observed woody plant encroachment in grassland systems (Van Auken, 2000).

Not exact matches

Still, without definitive proof of the PSA test's worth, the National Cancer Institute, the American Cancer Society, and others say only that the test should be «offered»; in contrast, they recommend that women «should be screened» for breast and cervical cancer.

Hardly the definitive test, admittedly, but confirmation that while the Superleggera is far too special to use as everyday transport, it can do humdrum stop - start urban stuff without throwing a hissy fit if needs be.

However, there can NEVER be a definitive diagnosis of cancer of any type without a sample of tissue being submitted to a pathologist for specialized testing.

If the theory is definitive enough, it can equally well be tested in hindsight without predictions that are made in advance.