The presence of chiral side chains supports the helical conformation independent of hydrogen-bond patterns, thus making it persistent in a variety of solvents and at a broad pH range.
The MPAA's criteria for this rating are contradictory, weirdly puritanical, and therefore thoroughly all-American: sex and anything more than "brief" nudity are out; one "sexually-derived" expletive is acceptable (so make it count!); "persistent" violence is okay but "realistic" violence is verboten.
DDT is an example of a magnificent piece of technology whose great advantages as an insecticide are the very qualities that make it an unacceptably persistent poison subject to concentration factors of hundreds of thousandfold in the environment with devastating effects.
They make it clear that a persistent unease suffuses the state on both the economic and political fronts.
The high lipophilicity of β-HCH, together with its extreme persistence (i.e. the estimated half life of 10 years in human tissues) due to its resistance to metabolism or to other environmental cleansing forces, makes it extremely persistent and bioaccumulating in fatty tissues such as breast tissues.
These three new features — a webwide Like button, auto-Connect, and a persistent toolbar — make it abundantly clear that Facebook is looking to extend its reach to as much of the web as possible, and it won't be an opt-in experience.
Unfortunately, while the relative contribution of influenza virus to COPD exacerbations is thought to be less serious in regions that offer immunization [8], and immunization is currently the GOLD standard preventative treatment, some patients believe it may trigger exacerbations and thus refuse vaccination [9], [10], making it a persistent threat.
Audacity -- The audacity to be bold, to be persistent, to make it happen and to ask for what you want.
Several epidemiological studies make it possible to conclude that persistent infection by certain types of HPV is a causal and necessary factor for the development of cervical cancer.
The fact that the rumours persist around this doesn't make it more true; it just makes those who push the rumours persistent.
