The American Heritage Dictionary of Medicine © 2018 by Houghton Mifflin Harcourt Publishing Company.

There appears to be no reason to doubt that the sexual generation is homologous with the thallus of a Liverwort, or of such an Alga as Coleochaete. homologous structure in a sentence - Use "homologous structure" in a sentence 1. The mere retention of the same crystal form by homologous substances is not a sufficient reason for denying a morphotropic effect to the substituent group; for, in the case of certain substances crystallizing in the cubic system, although the crystal form remains unaltered, yet the structures vary. All rights reserved. click for more sentences of homologous structure: 5. These structures do not have to look exactly the same, or have the same function. In the female, the urethral artery serves the analogous structures. The stalk of an ovule, considerably reduced in normal flowers and much larger in some abnormal flowers, is homologous with a leaf-stalk, with which it agrees in the structure and number of vascular bundles. He also devised a method of great value in the quantitative analysis of organic substances for the estimation of nitrogen, while the classification, of organic compounds into homologous series was advanced as one consequence of his researches into the acids generated by the oxidation of the alcohols.

The fins of Pteropods are now interpreted as the expanded lateral margins of the foot, termed parapodia, not homologous with the siphonof Cephalopods which is formed from epipodia. Homologous structures were such as, though greatly differing in appearance and detail from one another, and though performing widely different functions, yet were capable of being shown by adequate study of a series of intermediate forms to be derived from one and the same part or organ of the " plan-form " … the plates at the tips of the rays) in Asteroidea and Ophiuroidea, and therefore not homologous with the radially disposed plates often seen around the aboral pole of those animals. 2. At a temperature of about 300-400° C. the alkyl chloride formed in this reaction attacks the benzene nucleus and replaces hydrogen by an alkyl group or groups, forming primary amines homologous with the original amine; thus methylaniline hydrochloride is converted into paraand ortho-toluidine hydrochloride, and trimethyl phenyl ammonium iodide is converted into mesidine hydriodide.

The gland somewhat resembles a caecum in structure, but is not a. This long downward process being homologous with an almost exactly identical arrangeFIG. English Wiktionary.

The view is commonly held that these eye-stalks are really limbs, homologous with the other appendages. When two organs can be traced along the same line of descent to one primitive form, that is when they are found to be mono phyletic, their homology is complete; when, however, they are traceable to two primitive forms, though these forms belong to the same morphological series, they are polyphyletic and therefore only incompletely homologous. Later still he engaged in the study of the relations between chemical constitution and rotation of the plane of polarization in a magnetic field, and enunciated a law expressing the variation of such rotation in bodies belonging to homologous series.

The wing structure of a bird and the arm structure of a man are an example of things that arehomologous. The more closely organisms are related, the more similar the homologous structures are. homologous structure definition: The definition of a homologous structure is an organ or body part that appears in different animals and is similar in structure and location, but doesn't necessarily share the same purpose. This byssus is not homologous with that of other Lamellibranchs, but originates from a single glandular epithelial cell embedded in the tissues on the dorsal anterior side of the adductor muscle. Recent researches have shown that the law originally proposed by Kopp - " That the specific volume of a liquid compound (molecular volume) at its boiling-point is equal to the sum of the specific volumes of its constituents (atomic volumes), and that every element has a definite atomic value in its compounds " - is by no means exact, for isomers have different specific volumes, and the volume for an increment of CH 2 in different homologous series is by no means constant; for example, the difference among the esters of the fatty acids is about 57, whereas for the aliphatic aldehydes it is 49. Does English Have More Words Than Any Other Language? , $MMT = window.$MMT || {}; $MMT.cmd = $MMT.cmd || [];$MMT.cmd.push(function(){ $MMT.display.slots.push(["45ba4f61-76ac-4b3d-94d4-c9019d2ebe3c"]); }), $MMT = window.$MMT || {}; $MMT.cmd = $MMT.cmd || [];$MMT.cmd.push(function(){ $MMT.display.slots.push(["418b1e7b-a189-47b4-952a-43e52a926ad5"]); }), $MMT = window.$MMT || {}; $MMT.cmd = $MMT.cmd || [];$MMT.cmd.push(function(){ $MMT.display.slots.push(["9b588b9a-598a-47f4-bc83-ba2fd303e5df"]); }). 3, T), has been much discussed, some authorities holding that it is a true somite, homologous with those which precede it.

As an organ donor, Ted is a homologous match to Peter so he can give him one of his kidneys. In such examples as the above we may regard the hymenium (Solenia, Cyphella), zygospores, or asci as truly invested by later growth, but in the vast majority of cases the processes which result in the enclosure of the spores, asci, &c., in a "fructification" are much more involved, inasmuch as the latter is developed in the interior of hyphal tissues, which are by no means obviously homologous with a stroma.

Relating to chromosomes that have the same morphology and linear sequence of gene loci. Similar in structure and evolutionary origin but having different functions, as a human's arm and a seal's flipper. The homologous superfamilies cluster proteins with highly similar structures and functions. By Haeckel they are considered homologous with the umbrella of a medusa. Available under CC-BY-SA license. (of organs) similar in position, structure, and evolutionary origin but not necessarily in function. The two stores may have different prices, but they are homologous because they offer the same goods. Here Are Our Top English Tips, The Best Articles To Improve Your English Language Usage, The Most Common English Language Questions. A gene homologous to human interleukin 10 in cytomegalovirus was found to be powerfully immunosuppressive [4] . A cubic fourfold is called special if it contains a surface which is not homologous to a multiple of a plane section. People will see it as Author Name with your public flash cards.

serially homologous with the intervertebral pads. Examples of Organisms . 185.8° Equal increments in the molecule are associated with an equal rise in the boiling-point, but this increment varies in different homologous series. Homologous definition, having the same or a similar relation; corresponding, as in relative position or structure.

and In its earlier conception, this view embraced as homologous organs (so far as the present group is concerned) not only the nephridia of Oligochaeta and Hirudinea, which are obviously closely similar, but the wide tubes with an intercellular lumen and large funnels of certain Polychaeta, and (though with less assurance) the gonad ducts in Oligochaeta and Hirudinea. there are homologous proteins in humans and we have isolated T cell clones from healthy individuals which react with both bacterial and human hsp60.

These mountain systems are homologous in structure with those, not of Celebes or of Halmahera, but of Malacca, Banka and Billiton.

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