Database of verified butterfly and moth records in the United States and Mexico. Includes distribution maps, photographs, species accounts, and species checklists for each county in the U.S. and each state in Mexico.
Database of natural lipids including fatty acids, glycerolipids, sphingolipids, steroids, and various vitamins. Contains more than 6000 unique molecular structures, their lipid names, spectral information, and literature information.
Provides information on the classification, structural features, natural history, ecology and evolutionary relationships of bryophytes (mosses, liverworts and hornworts).
Digitized journals and books in biodiversity spanning 200 years from the collections of ten major natural history museum libraries, botanical libraries, and research institutions.
Freely accessible research database focusing on the relationship between human beings and the environment (subjects cover law, agriculture, education, health, technology, etc.) Contains scholarly and general interest titles, government documents, and reports.
Encyclopedia on the structure and function of proteins, RNA, DNA, and other macromolecules, and their assemblies and interactions with small molecules.
The PLANTS Database provides standardized information about the vascular plants, mosses, liverworts, hornworts, and lichens of the U.S. and its territories.
Database that describes the complete genome sequence of E. coli K-12 MG1655, the nucleotide position and function of every its genes, several types of cellular regulation, and metabolic pathways.
Repository of information about the 3D structures of large biological molecules, including proteins and nucleic acids, and their relationships to sequence, function, and disease.
Collection of information about biodiversity compiled collaboratively by hundreds of expert and amateur contributors. Contains pictures, text, and other information for species living or extinct and the hierarchy of life, phylogeny and evolution.
Database of animal natural history, distribution, classification, and conservation biology. Contains species accounts about individual animal species and descriptions of levels of organization above the species level, especially phyla, classes, and in some cases, orders and families.
There is no official classification of prokaryotes, but the names given to prokaryotes are regulated. This website includes the nomenclature of prokaryotes and the nomenclatural changes as cited in the literature.
General purpose multiple sequence alignment program for DNA or proteins. It produces multiple sequence alignments of divergent sequences and calculates the best match for the selected sequences, and lines them up so that the identities, similarities and differences can be seen.
"The Index contains entries dealing with various aspects of extant and fossil North and South American plants and fungi, including systematics and floristics, morphology, and ecology, as well as economic botany and general botany."