Manyconsumersunscreenproductscontainsnanomaterialstoenhanceitsprotectiveeffects.Thesematerials(e.g.titaniumdioxide(TiO2))donotdegradeeitheronhumanskinorintheenvironment.Thiscausesethical&environmentalconcerns.Buttheproducersnevertelltheconsumersaboutthis.
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InthecaseofsalmonvaccineswithPLGAnanoparticles,thePLGAnanoparticlescanenhancetheimmuneresponseofthesalmonvaccines&thusprotectthefishbetter.Buttheeffectsofthenanoparticlesonthefishmeatquality&safetyareunknown.Theenvironmentaleffectsareunknown.Theconsumersknowthiswhenthefishissold.
A. 对
B. 错
Nanomaterials(nanoparticles)arematerialsorparticleswithanyexternaldimensioninthenanometerscale(from1nmto100nm)orhavinginternalorsurfacestructuresinthenanometerscale.
A. 对
B. 错
Nanoparticlesthatarenaturallyoccurring(e.g.volcanicashorsootfromforestfires)oraretheincidentalbyproductsofcombustionprocesses(e.g.welding,dieselengines)areusuallyphysicallyandchemicallyheterogeneous,andareoftentermedultrafineparticles.
A. 对
B. 错
Engineerednanomaterialsareartificiallyproduced,anddesignedwithveryspecificpropertiesrelatedtotheirshape,size,surface,andchemistry.
A. 对
B. 错