Related by context. Frequent words. (Click for all words.) 68 tiny pores 63 microcapsules 62 pores 60 digestive juices 60 membranes 59 membrane 59 calcium ions 59 microspheres 58 Ultraviolet light 58 microchannels 58 oxidizes 58 sodium ions 57 capillaries 57 micelles 57 adsorb 57 molecules 57 droplets 57 cell membranes 57 microbubbles 57 ultrasonic waves 57 collagen fibers 57 cell membrane 57 hydrogen ions 56 stratum corneum 56 mycelium 56 outer membrane 56 vesicle 56 tubules 56 sebaceous glands 55 microstructures 55 nano particles 55 kerogen 55 particles 55 carbonic acid 55 dye molecules 55 nanometer sized 54 hydrophilic 54 bacterial spores 54 silver ions 54 hydrophobic 54 sclera 54 hydroxide 54 sebum 54 outermost layer 54 polymeric 54 mouthparts 54 sinus cavities 54 fibrin 53 outer layer 53 SWCNTs 53 micron sized 53 microscopic particles 53 filaments 53 anions 53 ionised 53 microscale 53 thick mucus 53 nanocrystals 53 secretions 53 dermis 53 macromolecules 53 nanospheres 53 biological molecules 53 fibrous 53 salt crystals 53 adsorbed 53 nano particle 52 liposome 52 biocompatible 52 crystal lattice 52 urushiol 52 oily residue 52 polymer coating 52 gastrointestinal GI tract 52 nanopores 52 nano scale 52 stomata 52 biofilm 52 microscopic algae 52 gastro intestinal tract 52 hydrogel 52 nanoparticles 52 bilayer 52 oxidize 52 alveoli 52 ionize 52 dentin 52 granules 52 hydroxyapatite 52 ionized gas 52 hydrogen atoms 51 mucous membrane 51 nanostructure 51 photonic crystal 51 tiny droplets 51 ions 51 biomolecule 51 pollen grains 51 interfacial 51 graphene sheets 51 reactant