What's the difference between density and isopycnic?
Density
Definition:
(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.
Isopycnic
Definition:
(a.) Having equal density, as different regions of a medium; passing through points at which the density is equal; as, an isopycnic line or surface.
(n.) A line or surface passing through those points in a medium, at which the density is the same.
Example Sentences:
(1) Isopycnic analyses of the ribonucleotide initiated fd DNA replication products demonstrated covalent linkage between the initiator RNA and newly synthesized DNA.
(2) Upon fractionation of macrophage homogenates by isopycnic centrifugation in sucrose gradients, fluoroquinolones are not found associated with any specific cellular structure.
(3) A method has been developed for the simultaneous isolation of basolateral plasma membrane vesicles from surface and crypt cells of rabbit distal colon epithelium by sequential use of differential sedimentation, isopycnic centrifugation and Ficoll 400 barrier centrifugation.
(4) Separation was attained by isopycnic centrifugation in a preformed discontinuous density gradient of Urografin.
(5) Negatively stained virions purified from papilloma homogenates by isopycnic CsCl centrifugation were 55 nm in diameter and had typical papillomavirus morphology.
(6) Rate sedimentation and isopycnic centrifugation were used to analyse the subcellular sites of enzymes in homogenates of goldfish intestinal mucosa.
(7) Artificial mixtures of plasma membrane vesicles produced by microcavitation from infected and uninfected cells band at the same density on isopycnic centrifugation in sucrose density gradient.
(8) The corresponding phase diagram in water for these mixtures was determined by DSC and isopycnic centrifugation in D(2)O-H(2)O gradients.
(9) Subfractionation of human HDL by serial isopycnic ultracentrifugation and by heparin-Sepharose affinity chromatography established that the denser and smaller particles had greater trypanolytic activity both in vitro and in vivo.
(10) Thymocytes from rats and mice have been separated into large and small cell populations in high yield and purity by isopycnic centrifugation in a discontinuous (three-layered) gradient of Percoll.
(11) After isopycnic centrifugation in a sucrose gradient, invertase is located in higher density zones than acid hydrolases.
(12) Because of their intrinsic low buoyant density, chitosomes can be separated from crude cell homogenates (1000 g or 35,000 g supernatants) of Mucor rouxii by isopycnic sedimentation in sucrose density gradients.
(13) When microsomal preparation was further fractionated by isopycnic centrifugation in the presence of deoxycholate or by partitioning of sonicated microsomal preparation in aqueous-polymer two-phase systems, most of the haem oxygenase activity was found in a fraction different from the main fraction of the NADH- and NADPH-cytochrome c reductase and NADH--ferricyanide reductase activities.
(14) The enzyme remains attached to the membrane upon disruption of the granules by the use of detergents or by hypotonic shock and subsequent extraction with sodium sulfate, and can be isolated together with fragments of the granule membrane by isopycnic equilibration.
(15) Density-shift experiments and isopycnic analysis of DNA from cardiac muscle of the adult show that it is more fragmented than DNA from cardiac-muscle cells that are, or have recently ceased, dividing.
(16) This isolation technique utilizes a sucrose density gradient to trap and isopycnically band the virus particles, and permits recovery of the particles from the rotor in an unaggregated condition.
(17) Using isopycnic centrifugation in metrizamide gradient, effect of ions and chromatin concentration on the buoyant density of chromatin was quantitatively examined.
(18) Serum lipoproteins from 12h fasted male chicks (15-day-old) were separated into 20 fractions by isopycnic density gradient ultracentrifugation.
(19) Further purification of mitochondria, accomplished by separating dense granules with a step gradient before isopycnic centrifugation, substantiated the evidence that microbodies (glyoxysomes) do not occur in these nematode larvae.
(20) On the other hand, infection with purified HIV particles obtained by filtration, differential centrifugation, and isopycnic sedimentation led to a progressively increasing stimulation of cell growth.