ion Definitions


ion of chios, a greek writer, dramatist, lyric poet and philosopher of the pythagorean school


an atom or group of atoms bearing an electrical charge, such as the sodium and chlorine atoms in a salt solution.


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a state or condition

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  • most conventional gasoline-powered vehicles use lead-acid batteries. electric vehicles, however, require large lithium-ion batteries or other batteries that use new technologies that provide more power and weigh less than older batteries of a similar size. batteries in electric vehicles must also supply a much greater amount of electricity and recharge faster than those in conventional vehicles. thus, electric vehicle batteries are much larger than conventional vehicle batteries; they usually weigh several hundred pounds, need to be replaced after several years, and can cost thousands of dollars. scientists and engineers continue to develop new technologies to create smaller, lighter batteries that last longer and provide more power. bls.gov

  • the central intelligence agency often develops technology and conducts research that not only advances its mission but, when declassified, can have significant impact on the world. in the 1970s, the cia shared research it had done on lithium-ion batteries with the medical community. this same technology is used in heart pacemakers today. cia.gov

  • electronic filters, such as ion-type cleaners these use electrical charges to attract and deposit allergens and irritants. if the device contains collecting plates, the particles are captured within the system. the ion-chargers in these filters also produce ozone — more of it than fans in mechanical filters — but the amount may still be within the acceptable level. again, ask for proof from the manufacturer. everydayhealth.com

  • however, if you take a look at the other side of the equation, we find the nitrate and ammonium ions. because the nitrate ion can accept protons from the ammonium ion (to form hno3), the nitrate ion is a very weak brnsted-lowry base. because the ammonium ion has an extra proton to donate (in this case to the nitrate ion), it is a brnsted-lowry acid. factmonster.com

  • at the start of each activity cycle, neurons in the brain emit a k+ ion and thus acquire an internal negative electrical charge. during recovery from activation a neuron which still retains its negative internal electrical charge before achieving electrical equilibrium will undergo a seizure and be destroyed if it happens to capture a nearby k+ ion which has not been washed far enough away by the circulation of csf. the circulation of csf in healthy brains establishes a virtually negligible probability for the capture of k+ ions but the statistical probability for capture of k+ ions during recovery from activation increases exponentially in areas of the brain where the circulation of csf becomes compromised. a compromised inadequate circulation of cerebrospinal fluid and the resulting destruction of neurons is the direct cause of alzheimer's disease. the tau tangles that form in alzheimer's brains are the remnants of destroyed neurons. hhs.gov

  • however, if you take a look at the other side of the equation, we find the nitrate and ammonium ions. because the nitrate ion can accept protons from the ammonium ion (to form hno3), the nitrate ion is a very weak brnsted-lowry base. because the ammonium ion has an extra proton to donate (in this case to the nitrate ion), it is a brnsted-lowry acid. infoplease.com

  • 4. view of lower section of a typical bridge-type circuit breaker. the oil tank has been dropped to show stationary 'de-ion grid' contacts at left and right of center. moving contacts are shown in the open position below 'de-ion grid' contacts. they are pulled upward and into the stationary contacts by the actuating shaft and lift rod assembly at the center of the photograph. ... 4 x 5 in.haer conn,1-coscob,2c--4 | haer conn,1-coscob,2c--4 loc.gov

  • spinal cord stimulator insertion, lumbar sympathetic block, epidural blood patch, stellate ganglion block, joint inject...ion, medial branch block, spinal injection, celiac plexus block, trigger point injection, botox injection, lumbar pain, cluster headache, postherpetic neuralgia, spondylosis, csf leak, neuropathic pain syndrome, glossopharyngeal neuralgia, migraine, neck pain, occipital neuralgia, radiculopathy, osteoarthritis, trigeminal neuralgia mayoclinic.org

  • ion channel: a protein that acts as a pore in a cell membrane and permits the selective passage of ions (such as potassium ions, sodium ions, and calcium ions), by means of which electrical current passes in and out of the cell. ion channels also serve many other critically important functions including chemical signalling, transcellular transport, regulation of ph, and regulation of cell volume. malfunction of ion channels can cause diseases in many tissues. the array of human diseases associated with defects in ion channels is growing. these diseases are called channelopathies. medicinenet.com

  • the ankyrin-b protein is active in many cell types, particularly in the brain and in heart (cardiac) muscle. this protein mainly interacts with ion channels and ion transporters, which are complexes of proteins that move charged atoms (ions) across cell membranes. in the heart, the flow of ions (such as sodium, potassium, and calcium) through ion channels and ion transporters generates the electrical signals that control the heartbeat and maintain a normal heart rhythm. ankyrin-b ensures these channels and transporters are in their proper locations in the cell membrane so they can regulate the flow of ions into and out of cardiac muscle cells. in addition, ankyrin-b helps ensure that signaling molecules that regulate the activity of ion channels and ion transporters are in the proper location. medlineplus.gov

  • he indicated that ion levels were closely correlated with revision during follow-up. whereas five-year survivorship was 97% when cobalt ion levels stayed below 2 ppb, it fell to 25% in those with levels higher than 10 ppb. patients with levels above 20 ppb had a 50% risk of osteolysis, he said. medpagetoday.com

  • decreases in effective circulating volume (such as occur with diuretic therapy) increase hco3− reabsorption, while increases in parathyroid hormone in response to an acid load decrease hco3− reabsorption. also, increased pco2 leads to increased hco3− reabsorption, while chloride ion (cl−) depletion (typically due to volume depletion) leads to increased sodium ion (na+) reabsorption and hco3− generation by the proximal tubule. merckmanuals.com

  • in the guest [m(en)3]2+ ion, the bonds of metal ion (zn2+/ni2+) with ethylenediamine molecules are mainly governed by the electrostatic interaction; as displayed in figure ​figure33b, the m–n bond length increases linearly with the molar fraction of zn (α) in znαni1−α(en)3ag2i4 (0 < α < 1), indicating that the bind energy of m–n in [m(en)3]2+ ion decreases with increasing the molar fraction of zn (α); accordingly, the thermal stability of [m(en)3]2+ ion should decrease with increasing the molar fraction of zn (α) in znαni1−α(en)3ag2i4 (0 < α < 1), and this conclusion is basically consistent with the alternation of the onset temperature of losing ethylenediamine molecules of znαni1−α(en)3ag2i4 (0 < α < 1). nih.gov