Sentence examples for persistent substances from inspiring English sources

Research has shown that harmful and persistent substances can both bioaccumulate (or increase in concentration as exposures persist) and biomagnify (or increase in concentration at higher trophic levels) within organisms as they assume some of the chemical burden of their prey or environment.

PCBs are very persistent substances, especially higher chlorinated congeners.

At least one of these values must be exceeded to fulfill the criteria for persistent substances under REACH.

The Oslo Paris Convention (OSPAR) was the first European convention dealing with persistent substances in the environment [40, 41].

This means that the substances have primary degradation times longer than 100 days that are most likely exceeding the trigger value for very persistent substances.

The results of this work proof that photocatalysis is a promising technology to reduce persistent substances even if they are present in low concentrations or in a complex matrix.

Other strategies seemed more damaging, like isolating oneself from friends and family who might detect the substance use, hiding or denying the pregnancy, timing prenatal appointments so that persistent substance use would not show up in drug tests, skipping some prenatal visits or avoiding prenatal care altogether.

It is further noted that 'assessment of persistency in the environment shall be based on available half-life data collected under appropriate conditions, which shall be described by the applicant.' Similarly, in paragraph 3.7.3.1, a very persistent substance (vP) is characterized by longer half-lives in the same environmental media.

Thus, among homeless adults with mental disorders, a history of early and persistent substance abuse may be a key indicator of risk.

Persistent substance abuse is also a significant predictor of service disengagement [ 38], adding to the growing evidence that reduction of substance use should be a major focus of treatment in FEP patients.

In a systematic review and meta-analysis of longitudinal studies it was found that non-adherence with medication, persistent substance use, carers' criticism and poorer premorbid adjustment significantly increased the risk for relapse in first-episode psychosis [ 5].