silica gel article 10 priority journal 8 Silica 6 chemistry 6 nonhuman 6 silicon dioxide 6 synthesis 6 Algae 4 Chlamydomonas reinhardtii 4 Chlorella vulgaris 4 Micro-algae 4 Microalgae 4 Microorganisms 4 Pseudokirchneriella subcapitata 4 Selenastrum capricornutum 4 Silicon Dioxide 4 Sol-gel 4 Sol-gel process 4 Sol-gels 4 alginic acid 4 carbazole derivative 4 isolation and purification 4 methodology 4 microalga 4 pH 4 unclassified drug 4 Ingeniería 3 2 (acetyloxy) 9h carbazole 2 2 methoxy 9 methyl 9h carbazole 2