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- A Farewell to Alms2007 book on Malthusian economic history by Gregory Clark
- A-DNAPotential conformation of DNA
- A. Murat ErenA. Murat Eren (Meren) is a computer scientist known for his work on microbial ecology and
- A.C.G.TA.C.G.T Inc. (Japanese: 株式会社エー・シー・ジー・ティー, Hepburn: Kabushiki-gaisha Ē shī jī tī, stylized
- A.O. Kovalevsky MedalThe A.O. Kovalevsky Medal, awarded annually by the St. Petersburg Society of Naturalists f
- AB5 toxinThe AB5 toxins are six-component protein complexes secreted by certain pathogenic bacteria
- ABCD StudyBrain development study in the United States
- Abdominal cavityBody cavity in the abdominal area
- Abelson murine leukemia virusThe Abelson murine leukemia virus (Ab-MLV or A-MuLV) is a retrovirus (Class VI) used to in
- Abiotic stressStress on organisms caused by nonliving factors
- Abortive initiationAbortive initiation, also known as abortive transcription, is an early process of genetic
- Abscisic acidPlant hormone
- AcanthamoebaGenus of protozoans
- AcanthamoebidaeAcanthamoebidae is a family of single-celled eukaryotes within the group Amoebozoa.
- AcanthariaClass of single-celled organisms
- Accessory hemiazygos veinThe accessory hemiazygos vein, also called the superior hemiazygous vein, is a vein on the
- AcclimatizationBiological adjustment to new climates
- Accommodation (vertebrate eye)Focusing ability of eye
- Acetic acid bacteriaGroup of bacteria
- AcetobacterAcetobacter is a genus of acetic acid bacteria. Acetic acid bacteria are characterized by
- Acetobacter acetiSpecies of bacterium
- AcetobacteraceaeAcetobacteraceae is a family of Gram-negative bacteria, belonging to the order Rhodospiril
- AcetogenMicroorganism producing acetate from CO2 and H2 through the reductive acetyl coenzyme A
- AcetogeninAcetogenins are a class of polyketide natural products found in plants of the family Annon
- Acetyl-CoAChemical compound
- AcetylcholineOrganic chemical and neurotransmitter
- Acid–base homeostasisProcess by which the human body regulates pH
- Acidithiobacillus thiooxidansSpecies of bacterium
- AcidophileOrganisms that thrive under highly acidic conditions
- AciduliprofundumAciduliprofundum is a genus of the Euryarchaeota.
- Aciduliprofundum booneiSpecies of archaeon
- AcinetobacterAcinetobacter is a genus of Gram-negative bacteria belonging to the wider class of Gammapr
- Acinetobacter baumanniiSpecies of bacterium
- AcrosomeThe acrosome is an organelle that develops over the anterior (front) half of the head in t
- Acrosome reactionFor fertilization to happen between a sperm and egg cell, a sperm must first fuse with the
- ActinFamily of proteins that form microfilaments
- Actin filamentFilament in the cytoplasm of eukaryotic cells
- ActinobacillusGenus of bacteria
- Actinobacillus pleuropneumoniaeActinobacillus pleuropneumoniae (previously Haemophilus pleuropneumoniae), is a Gram-negat
- ActinomycesGenus of bacteria
- Actinomyces israeliiSpecies of bacterium
- Actinomyces massiliensisSpecies of bacterium
- ActinomycetaceaeThe Actinomycetaceae (often called actinomycetes or mycelial bacteria) are a family of bac
- ActinomycetalesOrder of Actinomycota
- ActinomycetesClass of bacteria
- ActinomycosisActinomycosis is a rare infectious bacterial disease caused by the gram-positive Actinomyc
- ActinophryidOrder of heliozoan protists
- ActinophrysActinophrys is a genus of heliozoa, amoeboid unicellular organisms with many axopodial fil
- ActinosphaeriumActinosphaerium is a genus of heliozoa, amoeboid unicellular organisms with many axopodial
- Action potentialNeuron communication by electric impulses
- Activated sludgeWastewater treatment process using aeration and a biological floc
- Activator (genetics)Protein that increases transcription of a gene or set of genes
- Active camouflageCamouflage changing continually to match background
- Active siteActive region of an enzyme
- Acyl carrier proteinThe acyl carrier protein (ACP) is a cofactor of both fatty acid and polyketide biosynthesi
- ADAM12Disintegrin and metalloproteinase domain-containing protein 12 (previously Meltrin) is an
- AdaptationismDarwinian perspective that biological traits are evolved adaptations
- Adaptive behavior (ecology)Behavior which increases reproductive success
- Adaptive immune systemSubsystem of the immune system
- Adaptive radiationProcess in which organisms diversify rapidly from an ancestral species
- Additive genetic effectsEffect when genes source into a phenotype
- AdeleorinaSuborder of microscopic, spore-forming parasites
- AdenineChemical compound in DNA and RNA
- Adenomatous polyposis coliProtein found in humans
- Adenosine diphosphateChemical compound
- Adenosine monophosphateChemical compound
- Adenosine thiamine triphosphateChemical compound
- AdenoviridaeFamily of viruses
- Adenovirus early region 1AGene expressed during adenovirus replication to produce E1A proteins
- Adenylyl cyclaseAdenylate cyclase (EC 4.6.1.1, also commonly known as adenyl cyclase and adenylyl cyclase,
- Adhesion G protein-coupled receptorClass of 33 human protein receptors
- AdipocyteCells that primarily compose adipose tissue, specialized in storing energy as fat
- Adipose tissueLoose connective tissue composed mostly by adipocytes
- Adolescent sexualityStage of human development
- Adonis blueThe Adonis blue (Lysandra bellargus, also known as Polyommatus bellargus) is a butterfly i
- AdrenergicAdrenergic means "working on adrenaline (epinephrine) or noradrenaline (norepinephrine)" (
- Advanced maternal agePregnancy at older ages
- Aerial rootRoot which grows above the ground
- Aerial stem modificationChanges in the plant stem for adaption
- Aerobic organismOrganism that thrives in an oxygenated environment
- AerobiologyStudy of airborne organisms
- AerococcusAerococcus is a genus in the phylum Bacillota (Bacteria). The genus was first identified i
- AeromonasGenus of bacteria
- Aeromonas hydrophilaAeromonas hydrophila is a heterotrophic, Gram-negative, rod-shaped bacterium mainly found
- Aeromonas mediaAeromonas media is a species of bacteria. RM (= ATCC 33907) is the type strain of this spe
- Aeromonas salmonicidaAeromonas salmonicida is a pathogenic bacterium that severely impacts salmonid populations
- Aeromonas veroniiAeromonas veronii is a Gram-negative, rod-shaped bacterium found in fresh water and in ass
- Aeropyrum pernixSpecies of archaeon
- AerotaxisAerotaxis is the movement caused by oxygen gradients. Positive aerotaxis involves the move
- AestivationState of animal or plant dormancy in the summer
- AF4/FMR2 familyFamily of nuclear transcriptional activators
- Affinity electrophoresisAffinity electrophoresis is a general name for many analytical methods used in biochemistr
- African admixture in EuropeGenetic mixing of peoples
- African paradise flycatcherThe African paradise flycatcher (Terpsiphone viridis) is a medium-sized passerine bird. Th
- AgamococcidioridaAgamococcidiorida is an order within the subclass Coccidia of the phylum Apicomplexia. All
- AgarThickening agent used in microbiology and food
- Agar platePetri dish with agar used to culture microbes
- AgaroseAgarose is a heteropolysaccharide, generally extracted from certain red algae. It is a lin
- Agarose gel electrophoresisMethod for separation and analysis of biomolecules using agarose gel
- Ageing of AustraliaDemographic phenomenon in Australia
- Aggregatibacter actinomycetemcomitansSpecies of bacterium
- Aggressive mimicryDeceptive mimicry of a harmless species by a predator
- AgrobacteriumGenus of bacteria
- AgrostologyScientific study of the grasses
- Akkermansia glycaniphilaSpecies of bacterium
- Akkermansia muciniphilaSpecies of bacterium
- AlanineΑ-amino acid that is used in the biosynthesis of proteins
- Alanine—glyoxylate transaminaseIn enzymology, an alanine-glyoxylate transaminase (EC 2.6.1.44) is an enzyme that catalyze
- Albert DöderleinAlbert Sigmund Gustav Döderlein (5 July 1860, Augsburg – 10 December 1941, Munich) was a G
- AlbicidinAlbicidin is an antibiotic and phytotoxic molecule produced by the bacterium Xanthomonas a
- AlbinariaAlbinaria is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusk
- AlbinismDisorder causing lack of pigmentation
- AldosteroneMineralocorticoid steroid hormone
- Alexandrium (dinoflagellate)Genus of single-celled organisms
- Alexandrium catenellaAlexandrium catenella is a species of dinoflagellates. It is among the group of Alexandriu
- Alexandrium monilatumAlexandrium monilatum is a species of armored, photosynthetic, marine dinoflagellates. It
- Alfred R. Loeblich JrAlfred R. Loeblich Jr (August 15, 1914 – September 9, 1994) was an American micropaleontol
- Algal bloomSpread of planktonic algae in water
- Alison P. GalvaniAmerican epidemiologist
- Alkalihalobacillus clausiiSpecies of bacterium
- AlkaliphileAlkaliphiles are a class of extremophilic microbes capable of survival in alkaline (pH rou
- AlleleVariant of DNA sequence at a locus
- Allele ageTime elapsed since an allele first appeared
- Allele frequencyRelative frequency of a variant of a gene at a particular locus in a population
- Allen's ruleRelation of habitat temperature and limb length
- Allochronic speciationSpeciation arising from change in breeding time
- AllogamyType of fertilization
- AlloherpesviridaeFamily of viruses
- Allometric engineeringAllometric engineering is the process of experimentally shifting the scaling relationships
- AllometryStudy of the relationship of body size to shape, anatomy, physiology, and behavior
- Allopatric speciationSpeciation that occurs between geographically isolated populations
- AllorecognitionAbility to distinguish tissues from another
- Allorhizobium vitisAllorhizobium vitis is a plant pathogen that infects grapevines. The species is best known
- Allosteric regulationIn the fields of biochemistry and pharmacology an allosteric regulator (or allosteric modu
- Aloe hereroensisAloe hereroensis is an African Aloe native to Angola, Namibia and South Africa. Like other
- Alpha helixType of secondary structure of proteins
- Alpha-ketoglutarate-dependent hydroxylasesAlpha-ketoglutarate-dependent hydroxylases are a major class of non-heme iron proteins tha
- AlphaflexiviridaeAlphaflexiviridae is a family of viruses in the order Tymovirales. Plants and fungi serve
- AlphafusellovirusAlphafusellovirus is a genus of viruses, in the family Fuselloviridae. Species in the genu
- AlphaherpesvirinaeSubfamily of viruses
- AlphaproteobacteriaClass of bacteria
- AlpharetrovirusAlpharetrovirus is a genus of the family Retroviridae. It has type C morphology. Members c
- AlphavirusGenus of viruses
- Alpinia purpurataAlpinia purpurata, commonly referred to as red ginger, ostrich plume and pink cone ginger,
- Alternative splicingProcess by which a gene can code for multiple proteins
- Altruism (biology)Behaviour that increases the fitness of another while decreasing the fitness of self
- Alu elementMobile genetic element in the primate genome (including human genome)
- ALX3Protein-coding gene in the humans
- Amalia DutraUruguayan genetic biologist
- AMD XDNAXDNA is the name for AMD's neural processing unit microarchitecture. It is based on IP blo
- American foulbroodAmerican foulbrood (AFB, Histolysis infectiosa perniciosa larvae apium, Pestis americana l
- American Society for MicrobiologyScholarly society focused on microbiology
- American Society of Clinical OncologyThe American Society of Clinical Oncology (ASCO) is a professional organization representi
- Ames strainStrain of the anthrax bacterium
- Amino acid replacementExchange between amino acids of a protein
- Amino sugarIn organic chemistry, an amino sugar is a sugar molecule in which a hydroxyl group has bee
- Aminoacyl-tRNAAminoacyl-tRNA (also aa-tRNA or charged tRNA) is tRNA to which its cognate amino acid is c
- AminoacylaseIn enzymology, an aminoacylase (EC 3.5.1.14) is an enzyme that catalyzes the chemical reac
- AmitosisCell proliferation that does not occur by mitosis
- AmniocentesisSampling of amniotic fluid done mainly to detect fetal chromosomal abnormalities
- Amoeba (genus)Genus of Protozoa
- Amoeba proteusSpecies of amoeba
- AmoeboflagellateAn amoeboflagellate (pl. amoeboflagellates) is any eukaryotic organism capable of behaving
- Amoeboid movementMode of locomotion in eukaryotic cells
- AmorpheaGroup including fungi, animals and various protozoa
- Amplified fragment length polymorphismDNA profiling tool
- Amplified Ribosomal DNA Restriction AnalysisAmplified rDNA (Ribosomal DNA) Restriction Analysis is the extension of the technique of R
- AmygdalaPaired structure within the brain temporal lobe
- AmyloseChemical compound
- Ana Belén ElgoyhenArgentine molecular biologist
- AnabolismMetabolic pathways to build molecules
- Anaerobic organismOrganism not requiring oxygen for its growth
- Anaerobic respirationRespiration using electron acceptors other than oxygen
- AnaerococcusGenus of bacteria
- AnagenesisGradual evolutionary change in a species without splitting
- Analytical profile indexMicrobiological method for rapid identification
- AnaphaseFourth stage of mitosis and meiosis
- AnaplasmosisMedical condition
- Anatomical variationDifference between the anatomical structures
- Ancient BeringianExtinct archaeogenetic lineage
- Ancient DNAMethod of archaeological study
- Ancient North EurasianArchaeogenetic name for an ancestral genetic component
- Ancylostoma duodenaleSpecies of the roundworm genus Ancylostoma
- AncylostomatidaeThe Ancylostomatidae are a family of worms that includes the hookworms.
- AndrogenAny steroid hormone that promotes male characteristics
- AndrostaneAndrostane is a C19 steroidal hydrocarbon with a gonane core. Androstane can exist as eith
- AndrostenediolAndrostenediol, or 5-androstenediol (abbreviated as A5 or Δ5-diol), also known as androst-
- AneuploidyPresence of an abnormal number of chromosomes in a cell
- Angolan free-tailed batThe Angolan free-tailed bat (Mops condylurus) is a species of bat in the family Molossidae
- Angraecum sesquipedaleSpecies of orchid
- Animal cognitionAnimal cognition encompasses the mental capacities of non-human animals, including insect
- Animal consciousnessAnimal consciousness, or animal awareness, is the quality or state of self-awareness withi
- Animal Diversity WebOnline database
- Animal embryonic developmentProcess by which animal embryos form and develop
- Animal perception of magicTechnique in psychology
- Animal Sentience (journal)Animal Sentience: An Interdisciplinary Journal on Animal Feeling is a peer-reviewed academ
- Animal sexual behaviourSexual behavior of non-human animals
- Animal suicideIntentional end of an animal's own life
- Animals in Meitei cultureAnimals (Meitei: Saa/Shaa) have significant roles in different elements of Meitei culture,
- AnisogamySexual reproduction involving a large, female gamete and a small, male gamete
- Anita RobertsAmerican biologist
- ANKK1Protein-coding gene in the species Homo sapiens
- AnkleRegion where the foot and the leg meet
- AnomopodaAnomopoda is an order of the superorder Diplostraca. These crustaceans, a type of water fl
- Anopheles stephensiAnopheles stephensi is a primary mosquito vector of malaria in urban India and is included
- Anoxygenic photosynthesisProcess used by obligate anaerobes
- Ant colonyUnderground lair where ants live, eat, and tend eggs
- Antagonistic pleiotropy hypothesisProposed evolutionary explanation for senescence
- Antenna (zoology)Paired appendages used for sensing in arthropods, onychophorans and annelids
- AntennapediaHox gene
- Anterior lobe of cerebellumThe anterior lobe of cerebellum is one of the lobes of the cerebellum responsible for medi
- Anterior nasal spineThe anterior nasal spine, or anterior nasal spine of maxilla, is a bony projection in the
- AntheridiumPart of a plant producing and containing male gametes
- Anthrax toxinAnthrax toxin is a three-protein exotoxin secreted by virulent strains of the bacterium, B
- Anti-aging movementSocial movement devoted to eliminating or reversing aging, or reducing its effects
- Anti-CRISPRGroup of proteins found in phages
- Anti-immunoglobulinProtein that detects other antibodies
- Anti-miRNA oligonucleotidesAnti-miRNA oligonucleotides (also known as AMOs) have many uses in cellular mechanics. The
- Anti-sigma factorsAntagonists of a youth's slang
- Anti-union violence in the United StatesAnti-union violence in the United States entails physical harm done to trade union officia
- Antibacterial soapCleaning agents containing germ-killing chemicals
- Antibiotic sensitivity testingMicrobiology test used in medicine
- Antibody microarrayAn antibody microarray (also known as antibody array) is a specific form of protein microa
- Anticancer geneType of gene used for anticancer
- AntigenMolecule triggering an immune response
- Antigen presentationVital immune process that is essential for T cell immune response triggering
- Antimalarial medicationAgents used in the treatment of malaria
- Antimicrobial surfaceSurface coated by antimicrobials to inhibit microbial growth
- AntioxidantCompound that inhibits the oxidation of other molecules
- Antisense RNAAntisense RNA (asRNA), also referred to as antisense transcript, natural antisense transcr
- AntiterminationGenetic transcription mechanism in prokaryotes
- AntlerSkull projections found in deer
- AortaLargest artery in the human body
- Aorta-gonad-mesonephrosThe aorta-gonad-mesonephros (AGM) is a region of embryonic mesoderm that develops during e
- AP siteIn biochemistry and molecular genetics, an AP site (apurinic/apyrimidinic site), also know
- AparavirusAparavirus is a genus of viruses in the order Picornavirales, in the family Dicistrovirida
- Apex predatorPredator at the top of a food chain
- AphthovirusAphthovirus (from the Greek aphtha-, vesicles in the mouth) is a viral genus of the family
- Apical ectodermal ridgeThe apical ectodermal ridge (AER) is a structure that forms from the ectodermal cells at t
- Apicomplexan life cycleApicomplexa life cycle
- ApicoplastNon-photosynthetic plastid in Apicomplexa
- AplanochytriumGenus of single-celled organisms
- ApoptosisForm of programmed cell death
- Aporphine alkaloidsAlkaloid chemical compound
- AposematismHonest signalling of an animal's defences
- AppendageExternal body part or natural prolongation
- Appendicular arteryThe appendicular artery, also known as the appendiceal artery, commonly arises from the te
- Appendix (anatomy)Tube attached to the intestine
- Applications of evolutionPractical application of biological evolution
- AptychusAn aptychus is a type of marine fossil. It is a hard anatomical structure, a sort of curve
- AquaporinWater channel protein in cell membranes
- Aquatic locomotionBiologically propelled motion through a liquid medium
- Aquatic macroinvertebrate DNA barcodingDNA barcoding is an alternative method to the traditional morphological taxonomic classifi
- Aquatic plantPlant that has adapted to living in an aquatic environment
- AquifexGenus of bacteria
- Aquifex pyrophilusSpecies of bacterium
- AquirufaGenus of bacteria
- ArabinoseChemical compound
- Aralkylamine N-acetyltransferaseAralkylamine N-acetyltransferase (AANAT) (EC 2.3.1.87), also known as arylalkylamine N-ace
- ArambiletÁngel Luis Arambilet Álvarez (born September 16, 1957), generally known professionally as
- Arboreal locomotionMovement of animals through trees
- ArbovirusClass of viruses which are transmitted by arthropods
- ArcanobacteriumGenus of bacteria
- Arcanobacterium haemolyticum infectionAn Arcanobacterium haemolyticum infection is any of several types of infection with the gr
- ArcellinidaOrder of Amoebozoa
- Archaeal transcriptionArchaeal transcription is the process in which a segment of archaeal DNA is copied into a
- Archaeal transcription factor BArchaeal transcription factor B (ATFB or TFB) is a protein family of extrinsic transcripti
- ArchamoebaeInfraphylum of protists
- ArchegoniumOrgan of the gametophyte of certain plants, producing and containing the ovum
- Archibald ThorburnArchibald Thorburn FZS (31 May 1860, Lasswade, Midlothian – 9 October 1935, Hascombe, Surr
- Archon X PrizeAward
- AreolaPigmented area on the breast around the nipple
- ArginineAmino acid
- Arginine fingerCatalytic amino acid residue
- AriosophyEsoteric philosophy
- AristoiLabel given to noblemen in ancient Greek society
- Aristotle's biologyAristotle's theories of biology
- Armadillo repeatAn armadillo repeat is a characteristic, repetitive amino acid sequence of about 42 residu
- Arsenic biochemistryArsenic biochemistry is the set of biochemical processes that can use arsenic or its compo
- Art in Nazi GermanyThe Nazi regime in Germany actively promoted and censored forms of art between 1933 and 19
- Artaman LeagueGerman Interbellum ruralist movement
- ArterioleSmall arteries in the microcirculation
- Arthrobacter luteusArthrobacter luteus (ALU) is a species of gram-positive bacteria in the genus Arthrobacter
- Arthropod exoskeletonPart of arthropods
- Arthropod legForm of jointed appendage of arthropods
- Arthur GamgeeBritish biochemist
- Arthur James BoucotArthur James Boucot (May 26, 1924, Philadelphia, Pennsylvania, to 10 April 2017, Denver, C
- Artificial gene synthesisGroup of methods in synthetic biology
- Artificial lifeField of study
- Aryl hydrocarbon receptorVertebrate receptor protein and transcription factor
- Ascent of sapUpward movement of fluids from roots to aerial parts in plants
- AscoviridaeFamily of viruses
- AscusSpore-bearing cell in ascomycete fungi
- Áskell LöveÁskell Löve (20 October 1916 – 29 May 1994) was an Icelandic systematic botanist, particul
- AsparagineChemical compound
- AspartameArtificial non-saccharide sweetener
- Aspartic acidAmino acid
- ASPM (gene)Mammalian protein found in humans
- Assisted evolutionAssisted evolution (sometimes referred to as human-assisted evolution) is the practice of
- Assisted reproductive technologyMethods to achieve pregnancy by artificial or partially artificial means
- Association for Molecular Pathology v. Myriad Genetics, Inc.2013 United States Supreme Court case
- Assortative matingPreferential mating pattern between individuals with similar phenotypes
- Asthma-related microbesChronic Mycoplasma pneumonia and Chlamydia pneumonia infections are associated with the on
- AstromicrobiologyStudy of microorganisms in outer space
- Asynchronous musclesAsynchronous muscles are muscles in which there is no one-to-one relationship between elec
- AtavismReappearance of a genetic trait once thought extinct
- Ataxia telangiectasia and Rad3 relatedSerine/threonine-protein kinase ATR, also known as ataxia telangiectasia and Rad3-related
- ATC code H01ATC code H01 Pituitary and hypothalamic hormones and analogues is a therapeutic subgroup o
- ATCC (company)American biological culture collection
- AtopobiumAtopobium is a genus of Actinomycetota, in the family Coriobacteriaceae. Atopobium species
- ATP7AProtein-coding gene in humans
- ATPaseClass of enzymes
- Atrium (heart)Part of the human heart
- ATrynATryn is the brand name of the anticoagulant antithrombin manufactured by the Massachusett
- AtsızismTurkish ultranationalist ideology
- Auditory cortexPart of the temporal lobe of the brain
- Audrey CahnAustralian microbiologist and nutritionist
- Auramine phenol stainAuramine phenol stain is a stain used in clinical microbiology and histology to identify t
- Australian painted ladyThe Australian painted lady (Vanessa kershawi) is a species of butterfly mostly confined t
- Australian Research CouncilThe Australian Research Council (ARC) is the primary non-medical research funding agency o
- AutoclavePressurised heating apparatus
- Autocrine signalingSignaling within the same cell
- AutodisplayAutodisplay is a genetic engineering technique which is used to insert a protein of intere
- AutogamyFusion of gametes from the same individual
- AutoinducerSignaling molecule enabling detection and response to cell-population density
- AutomimicryMimicry of part of own body, e.g. the head
- Autonomic nervous systemDivision of the nervous system supplying internal organs, smooth muscle and glands
- AutophagosomeAn autophagosome is a spherical structure with double layer membranes. It is the key struc
- AutophagyProcess of cells digesting parts of themselves
- AutophosphorylationAutophosphorylation is a type of post-translational modification of proteins. It is genera
- AutosomeAny chromosome other than a sex chromosome
- AutotomySelf-amputation
- AutotrophOrganism type
- AuxinPlant hormone
- AuxotrophyInability to synthesize an organic compound required for growth
- Avalon, VictoriaAvalon (post code: 3212) is a locality situated north east of Geelong, Victoria. Its local
- AxarusThe genus Axarus is widely distributed with records from the Holarctic, the Neotropics and
- AxenicMicrobiological culture with only a single species or strain of organism
- Axial twist theoryScientific theory in vertebrate development
- AxonLong projection on a neuron that conducts signals to other neurons
- AzospirillumAzospirillum is a Gram-negative, microaerophilic, non-fermentative and nitrogen-fixing bac
- Azotobacter chroococcumSpecies of bacterium
