27-year-old female researcher working on nitrogen exchange between bacteria and the roots of legumes showing an example of a nodule of bacteria attached to the roots in the rainforest of the "La Selva" research station in Puerto Viejo de Sarapiqui, Costa Rica

natural reserve tropical rainforest scientific research scientist researcher woman person alone hand carry symbiosis indoor close up day laboratory botany march month root nodule la selva biological station botanist nature reserves nature reserve tropical rain forests ombrophile forest shade plants rain forest rainforest rain forests ombrophile forests scientific researches scientific studies scientific study scientists researchers women human beings persons human being human presence human presences human humans single lonely only solo one lone hands transport hold carried carrying held holding transporting transported transportation symbioses symbiotic symbiotics inside indoors days daytime laboratories lab labs botanies root nodules symbiotic nodules symbiotic nodule estación biológica la selva phytologist environment protection environment management biodiversity management environment tropical forest forest area science individual enumeration morphology zoology morphology organism relation between species species shot ambiance discipline root morphology botany heredia province costa rica central america america