What's the difference between overlay and underlay?

Overlay


Definition:

  • (v. t.) To lay, or spread, something over or across; hence, to cover; to overwhelm; to press excessively upon.
  • (v. t.) To smother with a close covering, or by lying upon.
  • (v. t.) To put an overlay on.
  • (n.) A covering.
  • (n.) A piece of paper pasted upon the tympan sheet to improve the impression by making it stronger at a particular place.
  • (imp.) of Overlie

Example Sentences:

  • (1) Plaque size, appearance, and number were influenced by diluent, incubation temperature after nutrient overlay, centrifugation of inoculated tissue cultures, and number of host cells planted initially in each flask.
  • (2) The adherence of the human respiratory pathogen, Bordetella pertussis, to purified glycosphingolipids was investigated using thin layer chromatography overlay assays.
  • (3) In vitro effect of intravenous immunoglobulin (IVIG), Intraglobin F, on serum opsonic activity against Staphylococcus aureus was studied in 26 full term normal healthy neonates and 18 intrauterine growth retarded (IUGR) neonates by the polymorphonuclear leucocyte overlay method (requiring only a few drops of blood).
  • (4) Dimethyl sulfoxide (DMSO) added to agar overlays during plaque assays of simian virus 40 (SV40) in CV1 monkey cells increases the plaque size and number and enables plaques to be read several days earlier than usual.
  • (5) The overlaying of earlier photos onto the present fundus also makes objective diagnosis of tumors, vessels, and other pathologically significant areas possible.
  • (6) Neutral red concentration in the agar overlay medium affected the number of plaques.
  • (7) Second, a domain of Drosophila alpha spectrin that includes two EF hand calcium-binding sequences bound 45Ca in blot overlay assays.
  • (8) These proteins were characterized with a virus overlay protein blot assay.
  • (9) By using an enzyme-linked assay, M8 and M18 were shown not to bind to MFGM glycolipid, whereas M3 and M24 did, and this was confirmed by overlaying thin layer chromatograms of MFGM lipids with these antibodies.
  • (10) Several bands were detected in each tissues using a 32P-RII overlay method.
  • (11) Overlaying the image are a few brusque swipes across the canvas, a gauzy smear of thin white paint, as if something had passed between us and the painting.
  • (12) No difference could be found between the numbers of mutans streptococci in plaque overlaying cavities and that from adjacent sound enamel.
  • (13) Inoculation of blood-agar by the push-block method and by use of concentrated mycoplasma cell suspensions was compared with the agar-overlay technique.
  • (14) Climbing fiber ablation by intraperitoneal injections of 3-acetylpyridine resulted in a selective depression of cerebellar CaM-PDE expression using Western immunoblot procedures; neither calcineurin (calmodulin-dependent protein phosphatase) nor other calmodulin binding proteins, detected by biotinylated calmodulin overlays, were affected.
  • (15) In addition, on the basis of gel overlay techniques, it appears that the hypersensitive site is also the site at which calmodulin binds to the alpha-subunit in a calcium-dependent manner.
  • (16) A considerable intensification of the avidin-biotin-peroxidase complex staining system (ABC) was obtained by sequentially overlaying the sections to be immunostained with an avidin-rich and a biotin-rich complex.
  • (17) To identify the molecule responsible for binding the virus to target cells, virus overlay protein blot assays were used to examine the molecular weights of cell surface molecules which bind purified virus.
  • (18) Preliminary results in the gel overlay assay show that other members of the intermediate filament family, nuclear lamins A-C, all bind the synthetic oligonucleotide containing the telomere repeat sequence of Oxytricha.
  • (19) The efficacy of the overlay technique for the direct detection of haemolytic colonies of Listeria from raw milk samples was related to agar selectivity.
  • (20) An isoelectric focusing-antigen overlay (IEF-O) technique showed that the target of one of the four cerebrospinal fluid oligoclonal bands was herpes simplex virus (HSV)-1 glycoprotein B, indicating a specific anti-HSV immunoresponse restricted to the CNS.

Underlay


Definition:

  • (v. t.) To lay beneath; to put under.
  • (v. t.) To raise or support by something laid under; as, to underlay a cut, plate, or the like, for printing. See Underlay, n., 2.
  • (n.) To put a tap on (a shoe).
  • (v. i.) To incline from the vertical; to hade; -- said of a vein, fault, or lode.
  • (n.) The inclination of a vein, fault, or lode from the vertical; a hade; -- called also underlie.
  • (n.) A thickness of paper, pasteboard, or the like, placed under a cut, or stereotype plate, or under type, in the from, to bring it, or any part of it, to the proper height; also, something placed back of a part of the tympan, so as to secure the right impression.

Example Sentences:

  • (1) After about 3 weeks of culture, N-ethyl-N-nitrosourea-pretreated fetal rat brain cells showed focal proliferation of neural cells on an underlayer of flat, epithelioid cells.
  • (2) These in vitro findings probably account for the remarkable results obtained in infections which up to now had mortality rates of 30 to 60 per cent, depending on the patient's underlaying condition.
  • (3) The type I + III collagen underlayer is reorganized when grafted.
  • (4) On the other hand, the alpha blockers might interfere with the ionic mechanisms underlaying the 4-AP effect thus, masking the removal of the noradrenergic control, due to an alpha blockade.
  • (5) The stromal underlayer has the typical morphological structure: its cells are compactly packed in the form of a skein with stromal mechanocytes among them.
  • (6) It is suggested that the motoneuron excitability changes within the interspike interval underlay the relationship between the motoneuron firing rate and effectiveness of the excitatory afferent volley.
  • (7) We report the anatomical and functional results of 156 myringoplasty; 134 with onlay surgical technique and 22 with underlay technique.
  • (8) Repair of the tympanic membrane with an underlay connective tissue graft (fascia in 90%) was successful in 97% of the ears.
  • (9) The small, underlayer scales, which on the flagella are shown to be arranged in 24 rows, number about 350000; larger scales of more complex construction number about 20 000.
  • (10) On pathological basis (simple, purulent and cholestéatomatous otitis) they used the overlay or the underlay method.
  • (11) A circus movement with antegrad conduction through the AV node and retograde conduction through an accessory pathway was found as the underlaying mechanism of the tachycardia.
  • (12) Flat cytoplasmic extensions of squamous cells underlay most of the goblet cell basal pole which therefore had only a small area on the basal lamina.
  • (13) In arterial walls collagen type III was detected immediately underlaying the endothelial cell layer and in the tissue between tunica elastica interna and adventitia.
  • (14) After dividing the posterior anulus, the flaps are rotated anteriorly, a maneuver that provides ample exposure of the middle ear and greatly simplifies underlay fascia grafting.
  • (15) In double soft-agar culture, colony formations of cancer cells in the overlayer were stimulated or inhibited by the presence of various kinds of fibroblast in the underlayer.
  • (16) Charged £2,339 in September 2005 for supply and fitting of "magnolia cavalier cavalace velvet wool carpet with cloud and cumulus underlay".
  • (17) These facts do not contradict our previous suggestion that the lipid-protein interactions underlay the regulative action mechanism of the natural bioactive ligands.
  • (18) The colony-stimulating activity of unfractionated conditioned medium was equivalent to the activity of standard peripheral blood underlayers.
  • (19) Transmural infarction underlay each case of ruptured ventricular septum, while in ruptured papillary muscle 11 of 20 cases showed subendocardial infarction.
  • (20) This problem has been solved by the layering of an intermediate D2O solution under the BSA and subsequent removal of the BSA solution and the underlaying with D2O containing glutaraldehyde.