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U
- UHT pasteurization method of pasteurization that exposes milk to ultra-high temperatures (near 140 °C) for a few seconds, effectively sterilizing it so that it can be sealed and stored for long periods without refrigeration
- ulcer open sore
- ultramicrotome a device that cuts thin sections for electron microscopy
- unit membrane biological membrane composed of two layers of phospholipid molecules with the nonpolar tails associating to form a hydrophobic barrier between the polar heads; also called lipid bilayer
- unsaturated fatty acid lipid with hydrocarbon chains containing one or more carbon-carbon double bonds and subsequently fewer than the maximum number of hydrogen atoms per chain
- uracil pyrimidine nitrogenous base found only in RNA nucleotides
- ureter duct that transports urine from the kidneys to the urinary bladder
- ureteritis inflammation of the ureter
- urethra duct through which urine passes from the urinary bladder to leave the body through the urinary meatus
- urethritis inflammation of the urethra
- urinary bladder an organ that stores urine until it is ready to be excreted
- urinary meatus the opening through which urine leaves the body
- use-dilution test a technique for determining the effectiveness of a chemical disinfectant on a surface; involves dipping a surface in a culture of the targeted microorganism, disinfecting the surface, and then transferring the surface to a fresh medium to see if bacteria will grow
- uterus female reproductive organ in which a fertilized egg implants and develops
V
- vaccination inoculation of a patient with attenuated pathogens or antigens to activate adaptive immunity and protect against infection
- vagina female reproductive organ that extends from the vulva to the cervix
- vaginitis inflammation of the vagina
- vaginosis an infection of the vagina caused by overgrowth of resident bacteria
- vancomycin cell wall synthesis inhibitor of the glycopeptide class
- vancomycin-intermediate Staphylococcus aureus (VISA) pathogen with intermediate vancomycin resistance due to increased targets for and trapping of vancomycin in the outer cell wall
- vancomycin-resistant enterococci (VRE) pathogens resistant to vancomycin through a target modification of peptidoglycan subunit peptides that inhibit binding by vancomycin
- vancomycin-resistant Staphylococcus aureus (VRSA) pathogen with resistance to vancomycin that has arisen as a result of the horizontal gene transfer of vancomycin resistance genes from VRE
- variolation the historical practice of inoculating a healthy patient with infectious material from a person infected with smallpox in order to promote immunity to the disease
- vas deferens pair of ducts in the male reproductive system that conduct sperm from the testes and seminal fluid to the ejaculatory duct
- vasculitis inflammation affecting blood vessels (either arteries or veins)
- VDRL (Venereal Disease Research Laboratory) test test for syphilis that detects anti-treponemal antibodies to the phospholipids produced due to the tissue destruction by Treponema pallidum ; antibodies are detected through a flocculation reaction with cardiolipin extracted from beef heart tissue
- vector animal (typically an arthropod) that transmits a pathogen from one host to another host; DNA molecules that carry DNA fragments from one organism to another
- vegetative cell a cell that is actively growing and dividing, and does not contain an endospore
- vehicle transmission transfer of a pathogen between hosts via contaminated food, water, or air
- vein blood vessel that returns blood from the tissues to the heart for recirculation
- vertical direct transmission transfer of a pathogen from mother to child during pregnancy, birth, or breastfeeding
- vertical gene transfer transfer of genes from parent to offspring
- viable cell live cell; live cells are usually detected as colony-forming units
- viable plate count direct method of measuring microbial growth in a culture; the number of viable or live cells is usually expressed in CFU/mL
- viral conjunctivitis inflammation of the conjunctiva caused by a viral infection
- viral envelope lipid membrane obtained from phospholipid membranes of the cell that surrounds the capsid
- viral hemagglutination inhibition assay assay used to quantify the amount of neutralizing antibody against a virus by showing a decrease in hemagglutination caused by a standardized amount of virus
- viral titer number of virions per unit volume
- viremia presence of virus in blood
- viricide chemical or physical treatment that destroys or inactivates viruses
- virion inert particle that is the reproductive form of a virus
- viroid infectious plant pathogen composed of RNA
- virology the study of viruses
- virulence degree to which an organism is pathogenic; severity of disease signs and symptoms
- virulence factor product of a pathogen that assists in its ability to cause infection and disease
- virulent phage bacteriophage for which infection leads to the death of the host cell; a phage that undergoes the lytic cycle
- virus an acellular microorganism, consisting of proteins and genetic material (DNA or RNA), that can replicate itself by infecting a host cell
- virusoid small piece of RNA associated with larger RNA of some infectious plant viruses
- volutin inclusions of polymerized inorganic phosphate; also called metachromatic granules
- vulva the female external genitalia
W
- water activity water content of foods or other materials
- wavelength the distance between one peak of a wave and the next peak
- Weil’s disease advanced stage of leptospirosis in which the kidney and liver become seriously infected
- West African trypanosomiasis chronic form of African trypanosomiasis caused by Trypanosoma brucei gambiense
- West Nile encephalitis mosquito-borne disease caused by the West Nile virus (WNV) that can result in swelling of the brain and death in severe cases
- western blot technique used to detect the presence of a certain protein within a given protein sample in which proteins within the sample are separated by PAGE, immobilized on a membrane, and then exposed first to an antibody that binds to the protein of interest and then second to an antibody equipped with a molecular beacon that will bind to the first antibody
- western equine encephalitis serious but rare mosquito-borne viral infection of the brain that is found primarily in the central and western United States
- wet mount a slide preparation technique in which a specimen is placed on the slide in a drop of liquid
- wheal-flare reaction localized type I hypersensitivity reaction, involving a raised, itchy bump (wheal) and redness (flare), to injected allergen
- whooping cough common name for pertussis
- wild type phenotype of an organism that is most commonly observed in nature
- Winterbottom’s sign acute swelling of lymph nodes at the back of the neck that is an early sign of African trypanosomiasis
- wobble position third position of a codon that, when changed, typically results in the incorporation of the same amino acid because of the degeneracy of the genetic code
- World Health Organization (WHO) international public health organization within the United Nations; monitors and communicates international public health information and coordinates international public health programs and emergency interventions
X
- xenobiotic compound synthesized by humans and introduced to an environment in much higher concentrations than expected in nature
- xenograft transplanted tissue from a donor that is of a different species than the recipient
- X-linked agammaglobulinemia genetic disorder resulting in an inability to produce antibodies
- x-y mechanical stage knobs knobs on a microscope that are used to adjust the position of the specimen on the stage surface, generally to center it directly above the light
Y
- yeast any unicellular fungus
- yeast infection fungal infection of the vagina typically caused by an overgrowth of resident Candida spp.
- yellow fever mild to potentially fatal mosquito-borne viral disease caused by the yellow fever virus
Z
- Ziehl-Neelsen technique a method of acid-fast staining that uses heat to infuse the primary stain, carbolfuchsin, into acid-fast cells
- zone of inhibition clear zone around a filter disk impregnated with an antimicrobial drug, indicating growth inhibition due to the antimicrobial drug
- zoonosis see zoonotic disease
- zoonotic disease any disease that is transmitted to humans by animals
- zooplankton heterotrophic plankton
- Z-scheme electron flow seen in noncyclic photophosphorylation in plants, algae, and cyanobacteria due to the use of both PSI and PSII
- zygospores spores used by Zygomycetes for sexual reproduction; they have hard walls formed from the fusion of reproductive cells from two individuals
Read also:
OpenStax, Microbiology. OpenStax CNX. Nov 01, 2016 Download for free at http://cnx.org/content/col12087/1.4
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