(n.) The quality of being dense, close, or thick; compactness; -- opposed to rarity.
(n.) The ratio of mass, or quantity of matter, to bulk or volume, esp. as compared with the mass and volume of a portion of some substance used as a standard.
(n.) Depth of shade.
Example Sentences:
(1) It is suggested that the Japanese may have lower trabecular bone mineral density than Caucasians but may also have a lower threshold for fracture of the vertebrae.
(2) Ca2+ transport was positively correlated with MR cell density.
(3) Osteoporosis is characterized by a reduction in bone density.
(4) However, four of ten young adult outer arm (relatively sun-exposed) and one of ten young adult inner arm (relatively sun-protected) fibroblasts lines increased their saturation density in response to retinoic acid.
(5) We report a series of experiments designed to determine if agents and conditions that have been reported to alter sodium reabsorption, Na-K-ATPase activity or cellular structure in the rat distal nephron might also regulate the density or affinity of binding of 3H-metolazone to the putative thiazide receptor in the distal nephron.
(6) In schizophrenic patients the density of dopamine uptake sites in the basal ganglia was slightly reduced, mainly in the middle third of putamen.
(7) Size analysis of the solubilized IgA IP employing sucrose density gradient ultracentrifugation, indicated that these were heterogeneous, with a size generally larger than 19 S.
(8) Estimates of the risk probability for each dose level and sacrifice time are found utilizing the sample likelihood as the posterior density.
(9) We report on a patient, with a CT-verified low density lesion in the right parietal area, who exhibited not only deficits in left conceptual space, but also in reading, writing, and the production of speech.
(10) The compressive strength of bone is proportional to the square of the apparent density and to the strain rate raised to the 0.06 power.
(11) We assessed changes in brain water content, as reflected by changes in tissue density, during the early recirculation period following severe forebrain ischemia.
(12) Macrophages internalize aggregated low density lipoprotein (LDL) by LDL receptor-dependent phagocytosis.
(13) The capillary-adipocyte distances were shorter and the vascularization density was higher in old rats.
(14) By means of computed tomography (CT) values related to bone density and mass were assessed in the femoral head, neck, trochanter, shaft, and condyles.
(15) When compared with nonspecialized regions of the cell membranes, these contact sites were characterized by a decreased intercellular distance, subplasmalemmal densities and coated pits.
(16) Furthermore, high-density catalase-positive--but not catalase-negative--E. coli can survive and multiply in the presence of competitive, peroxide-generating streptococci.
(17) The deep cerebellar nuclei were moderately labeled at birth and gradually decreased in density thereafter.
(18) In spite of important differences in size, chemical composition, polymer density, and configuration, biological macromolecules indeed manifest some of the essential physical-chemical properties of gels.
(19) It is especially efficacious in evaluating patients with cystic lesions, especially those with complex cysts not clearly of water density.
(20) These observations suggest that the liver secretes disk-shaped lipid bilayer particles which represent both the nascent form of high density lipoproteins and preferred substrate for lecithin-cholesterol acyltransferase.
Rarefaction
Definition:
(n.) The act or process of rarefying; the state of being rarefied; -- opposed to condensation; as, the rarefaction of air.
Example Sentences:
(1) Three mechanisms are held responsible for the resistance increase: (1) a rarefaction of the smallest arterioles and capillaries, (2) an increased wall to lumen ratio and (3) a decreased internal diameter.
(2) When enalapril was given up to 14 weeks of age, the long-term suppression of amplifier properties was probably mainly through prevention of smooth muscle hypertrophy in resistance vessels and possibly through other mechanisms (e.g., "rarefaction").
(3) The cochlear summating potential (SP) preceding the auditory nerve compound action potential (AP) was elicited by broadband alternating condensation and rarefaction clicks and recorded by noninvasive electrodes from the external auditory meatus (EAM) of 60 volunteers of both sexes, 12 to 67 years old, who had normal hearing for age.
(4) BAEPs utilized rarefaction stimulation at 70 dB SL, with 150-3,000 Hz filter band pass and 10 ms. analysis time.
(5) On the basis of this property and a previously observed favourable effect of the enzyme on microcirculation, the capacity for more rapid rarefaction and elimination of caseous masses and prevention of excessive fibrosis, it was recommended for use in treatment of cerebrospinal disorders in tuberculous spondylitis.
(6) Rarefaction clicks produced shorter wave I latency and longer I-III interpeak latency, but the differences were significant in the female only.
(7) Typical features of rarefaction, osteoporosis, cysts, and cortical erosions were present.
(8) Multiple infarcts and white matter rarefaction are commonly seen as a component of Alzheimer disease, in keeping with the development of congophilic angiopathy and possibly other vascular changes in the latter disease.
(9) Thus the intensity functions of the round window N1 potential have a two-segment course and there is a difference in the response to rarefaction and condensation clicks, depending upon the content of low-frequency components in the click stimulus.
(10) Besides an obvious increase in blood rachemia in the arteries and veins, its rarefaction is observed in the capillaries.
(11) The lesion specific to the white matter showed rarefaction and gliosis without locally associated ischemic changes.
(12) Prevention of the experimental bone rarefaction which occurs in rats put on a low calcium diet was attempted by using salmon calcitonin and 25 hydroxyvitamin D given with a similar regimen to that used in human disease.
(13) Tone pip stimuli produced polarity differences that were inversely related to stimulus frequency: the higher the frequency, the smaller the ABR latency differences between responses to rarefaction and condensation stimuli, and the smaller the difference potentials.
(14) Foci of myeloid metaplasia may occasionally result in clinical disability, with bone pain and rarefaction.
(15) The following classification of the cerebellar granular layer damage was used: I degrees - focal rarefaction, II degrees - diffuse distinct rarefaction, III degrees - focal atrophy, IV degrees - diffuse atrophy.
(16) The latter ranged from spongiform transformation of the neuropil and scattered foci of demyelination to large perivenous areas with marked rarefaction of myelinated fibers.
(17) Along with this there occurs a rarefaction of the frequency of miniature potential of the end plate, and reduction of its amplitude.
(18) Recordings were obtained from normal hearing adults to separate trains of 5 rarefaction and 5 condensation clicks with interclick intervals of 10 msec and intertrain intervals of 500 msec at three intensities.
(19) The purpose of this study was to examine the muscle at the ultrastructural level to search for evidence of microvessel degeneration that would correlate with the concept of anatomic rarefaction in chronic hypertension.
(20) Electron microscopical examination was carried out in the renal tissue of 7 such cases, and showed dense mesangial deposits and a marked subendothelial rarefaction within the basement membrane.