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E

  • E (exit) site functional site of an intact ribosome that releases dissociated uncharged tRNAs so that they can be recharged with free amino acids
  • East African trypanosomiasis acute form of African trypanosomiasis caused by Trypanosoma brucei rhodesiense
  • eastern equine encephalitis serious, but rare, mosquito-borne viral infection of the brain that is found primarily on the Atlantic and Gulf coast states of the United States
  • Ebola virus disease (EVD) potentially fatal viral hemorrhagic fever found primarily in western Africa and transmitted through contact with body fluids
  • eclipse phase period after viral infection during which the infective virus is not detected, either intracellularly or extracellularly, and biosynthesis is occurring
  • ectoplasm outer, more gelatinous layer of cytoplasm under a protist cell membrane
  • edema swelling due to accumulation of fluid and protein in tissue as a result of increased permeability of capillary walls during an inflammatory response; chronic edema can also result from blockage of lymphatic vessels, as in the case of elephantiasis
  • effector cells activated cells of cellular immunity that are involved in the immediate immune response, primarily to defend the body against pathogens
  • electron carrier cellular molecule that accepts high-energy electrons from reduced molecules like foods and later serves as an electron donor in subsequent redox reactions
  • electron microscope a type of microscope that uses short-wavelength electron beams rather than light to increase magnification and resolution
  • electron transport system (ETS) series of membrane-associated protein complexes and associated mobile accessory electron carriers important in the generation of the proton motive force required for ATP production by chemiosmosis; the last component involved in the cellular respiration of glucose
  • electroporation a genetic engineering technique in which cells are exposed to a short electric pulse, inducing them to take up DNA molecules from their environment
  • elementary bodies metabolically and reproductively inactive, endospore-like form of intracellular bacteria that spreads infection outside of cells
  • elongation in DNA replication stage of DNA replication during which DNA polymerase adds nucleotides, complementary to the parental strand, to the 3’ end of a growing DNA strand
  • elongation in transcription stage of transcription during which RNA polymerase extends the RNA molecule by adding RNA nucleotides, complementary to the template DNA strand
  • elongation of translation stage of translation during which amino acids are added one by one to the C-terminus of the growing polypeptide
  • Embden-Meyerhof-Parnas (EMP) pathway type of glycolysis found in animals and the most common in microbes
  • emerging infectious disease a disease that is new to the human population or has increased in prevalence over the previous 20 years
  • enantiomers stereoisomers that are mirror images of each other and nonsuperimposable
  • encephalitis inflammation of the tissues of the brain
  • encystment the process of forming a cyst
  • endemic disease an illness that is constantly present (often at low levels) in a population
  • endergonic reaction chemical reaction that requires energy beyond activation energy to occur
  • endocarditis inflammation of the endocardium, especially the heart valves
  • endocrine function refers to a cytokine signal released from a cell and carried by the bloodstream to a distant recipient cell
  • endocytosis the uptake of molecules through plasma membrane invagination and vacuole/vesicle formation
  • endomembrane system a series of organelles (endoplasmic reticulum, Golgi apparatuses, lysosomes, and transport vesicles) arranged as membranous tubules, sacs, and disks that synthesize many cell components
  • endoplasm inner, more fluid layer of cytoplasm under a protist cell membrane (inside of the ectoplasm)
  • endoplasmic reticulum part of the endomembrane system that is an interconnected array of tubules and flattened sacs with a single lipid bilayer that may be either rough or smooth; important in synthesizing proteins and lipids
  • endospore a cellular structure formed by some bacteria in response to adverse conditions; preserves DNA of the cell in a dormant state until conditions are favorable again
  • endospore staining a differential staining technique that uses two stains to make bacterial endospores appear distinct from the rest of the cell
  • endosymbiotic theory the theory that mitochondria and chloroplasts arose as a result of prokaryotic cells establishing a symbiotic relationship within a eukaryotic host
  • endothelia layer of epithelial cells lining blood vessels, lymphatics, the blood-brain barrier, and some other tissues
  • endotoxin lipid A component of lipopolysaccharides in the outer membrane of gram-negative bacteria
  • enriched media media that contain additional essential nutrients to support growth
  • enrichment culture media providing growth conditions that favor the expansion of an organism present in low numbers
  • enteric bacteria of the family Enterobacteriaceae, which live in the human intestinal tract
  • enteritis inflammation of the lining of the intestine
  • enterobiasis intestinal infection caused by the pinworm Enterobius vermicularis
  • enterohemorrhagic E. coli (EHEC) E. coli bacteria that cause severe gastrointestinal illness with potential serious complications such as hemolytic uremic syndrome
  • enteroinvasive E. coli (EIEC) E. coli bacteria that cause relatively mild gastrointestinal illness
  • enteropathogenic E. coli (EPEC) E. coli bacteria that cause serious gastrointestinal illness
  • enterotoxigenic E. coli (ETEC) E. coli bacteria that cause a relatively mild illness commonly called traveler’s diarrhea
  • enterotoxin toxin that affects the intestines
  • Entner-Doudoroff (ED) pathway alternative glycolytic pathway used by some bacteria
  • enveloped virus a virus formed with a nucleic-acid packed capsid surrounded by a lipid layer
  • enzyme catalyst for biochemical reactions inside cells
  • enzyme immunoassay (EIA) type of assay wherein an enzyme is coupled to an antibody; addition of a chromogenic substrate for the antibody allows quantification or identification of the antigen bound by the antibody
  • enzyme-linked immunosorbent assay (ELISA) specialized form of EIA in which either the primary antibody or the antigen is first attached to a solid surface such as the well of a microtiter plate
  • eosinophils leukocytes with granules containing histamine and major basic protein; facilitate allergic responses and protection against parasitic protozoa and helminths
  • epidemic disease an illness with a higher-than-expected incidence in a given period within a given population
  • epidemic typhus severe and sometimes fatal infection caused by Rickettsia prowazekii and transmitted by body lice
  • epidemiology the study of where and when infectious diseases occur in a population and how they are transmitted and maintained in nature
  • epidermis the outermost layer of human skin
  • epididymis coiled tube that collects sperm from the testes and passes it on to the vas deferens
  • epididymitis inflammation of the epididymis caused by a bacterial infection
  • epigenetic regulation chemical modification of DNA or associated histones to influence transcription
  • epiglottis flap of cartilage that covers the larynx during swallowing; diverts food to the esophagus and prevents it from entering the respiratory tract
  • epiglottitis inflammation of the epiglottis
  • epiphyte a plant that grows on another plant
  • epitope smaller exposed region on an antigen that is recognized by B-cell and T-cell receptors and antibodies
  • Epsilonproteobacteria class of Proteobacteria that are microaerophilic
  • equivalence zone region where the antibody–antigen ratio produces the greatest amount of precipitin in a precipitin reaction
  • erysipelas a skin infection, typically caused by Streptococcus pyogenes , that presents as a red, large, intensely inflamed patch of skin involving the dermis, usually with clear borders, typically on the legs or face
  • erythema nodosum a condition that causes inflammation in the subcutaneous fat cells of the hypodermis resulting in red nodules
  • erythema redness at the site of inflammation, usually due to dilation of blood vessels in the area to help bring in white blood cells
  • erythrocyte red blood cell
  • erythrogenic toxin exotoxin produced by some strains of Streptococcus pyogenes ; activity of the toxin can produce the characteristic rash of scarlet fever
  • erythromycin protein synthesis inhibitor of the macrolide class that is often used as an alternative to penicillin
  • eschar a localized mass of dead skin tissue
  • Etest simple, rapid method for determining MIC, involving commercially available plastic strips that contain a gradient of an antimicrobial and are placed on an agar plate inoculated with a bacterial lawn
  • etiologic agent the pathogen or substance responsible for causing a particular disease; causative agent
  • etiology the science of the causes of disease
  • Eukarya the domain of life that includes all unicellular and multicellular organisms with cells that contain membrane-bound nuclei and organelles
  • eukaryote an organism made up of one or more cells that contain a membrane-bound nucleus and organelles
  • eukaryotic cell has a nucleus surrounded by a complex nuclear membrane that contains multiple, rod-shaped chromosomes
  • eustachian tube small passage between the nasopharynx and the middle ear that allows pressure to equalize across the tympanic membrane
  • eutrophs microorganisms that require a copious amount of organic nutrients; also called copiotrophs
  • excystment the process of emerging from a cyst
  • exergonic reaction chemical reaction that does not require energy beyond activation energy to proceed; releases energy when the reaction occurs
  • exocytosis the release of the contents of transport vesicles to the cell’s exterior by fusion of the transport vesicle’s membrane with the plasma membrane
  • exoenzyme secreted enzyme that enhances the ability of microorganisms to invade host cells
  • exon protein-coding sequence of a eukaryotic gene that is transcribed into RNA and spliced together to code for a polypeptide
  • exonuclease enzymatic activity that removes RNA primers in DNA introduced by primase
  • exotoxin biologically active product that causes adverse changes in the host cells
  • experimental epidemiology the use of laboratory and clinical studies to directly study disease in a population
  • experimental study a type of scientific study that involves manipulation of the study subjects by the researcher through application of specific treatments hypothesized to affect the outcome while maintaining rigorously controlled conditions
  • exposure contact between potential pathogen and host; also called contamination or contact
  • extended-spectrum β-lactamases (ESBLs) β-lactamases carried by some gram-negative bacteria that provide resistance to all penicillins, cephalosporins, monobactams, and β-lactamase-inhibitor combinations, but not carbapenems
  • extensively drug resistant Mycobacterium tuberculosis (XDR-TB) strains of M. tuberculosis that are resistant to rifampin and isoniazid, and also are resistant to any fluoroquinolone and at least one of three other drugs (amikacin, kanamycin, or capreomycin)
  • extracellular matrix material composed of proteoglycans and fibrous proteins secreted by some eukaryotic cells that lack cell walls; helps multicellular structures withstand physical stresses and coordinates signaling from the external surface of the cell to the interior of the cell
  • extracellular polymeric substances (EPS) hydrated gel secreted by bacteria in a biofilm containing polysaccharides, proteins, nucleic acids, and some lipids
  • extrachromosomal DNA additional molecules of DNA distinct from the chromosomes that are also part of the cell’s genome
  • extravasation process by which leukocytes pass through capillary walls to reach infected tissue; also called diapedesis

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
tijani
what is titration
John Reply
what is physics
Siyaka Reply
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Jude Reply
Can you compute that for me. Ty
Jude
what is the dimension formula of energy?
David Reply
what is viscosity?
David
what is inorganic
emma Reply
what is chemistry
Youesf Reply
what is inorganic
emma
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
Krampah Reply
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
Sahid Reply
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
Ryan
what's motion
Maurice Reply
what are the types of wave
Maurice
answer
Magreth
progressive wave
Magreth
hello friend how are you
Muhammad Reply
fine, how about you?
Mohammed
hi
Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
yasuo Reply
Who can show me the full solution in this problem?
Reofrir Reply
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Source:  OpenStax, Microbiology. OpenStax CNX. Nov 01, 2016 Download for free at http://cnx.org/content/col12087/1.4
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