longitudinal wave in a sentence

Outside the wall of the oesophagus a vascular space has been detected which is in direct continuity with the longitudinal blood-vessels. B has reference to horizontal forces acting in a longitudinal direction in the ship, and caused partly by the permanent magnetism of hard iron, partly by vertical induction in vertical soft iron either before or abaft the compass. In the Metanemertini, where the longitudinal stems lie inside the muscular body-wall, definite and metamerically placed nerve branches spring from them and divide dichotomously in the different tissues they innervate. The essential characteristic of the Cricetines is to be found in the upper cheek-teeth, which (as shown in the figure of those of Cricetus in the article RODENTIA) have their cusps arranged in two longitudinal rows separated by a groove. The railway connexions are with Ovalle to the S., and Vicua (or Elqui) to the E., but the proposed extension northward of Chile's longitudinal system would bring Coquimbo into direct communication with Santiago. In a cross sectional analysis, riots would be rare and even longitudinal analysis would potentially take may years to complete. I want to receive exclusive email updates from YourDictionary. The arrangement of the Pyrenees in chains gently inclined near the centre but longitudinal everywhere else, is illustrated by the courses of the streams which flow down towards Spain. Special mention must be made of the delicate transverse vessels regularly connecting the longitudinal and the lateral ones. On the south the principal streams, after cutting their way through the highest zone at right angles to the general direction of the range, become involved half-way to the plains in great longitudinal folds, from which they make their escape only after traversing long distances without finding an outlet. All the flowers of each triplet of spikelets on both sides of the rachis are fertile and produce ripe fruits; hence the ear produces six longitudinal rows of grain. The railway connexions are with Ovalle to the S., and Vicua (or Elqui) to the E., but the proposed extension northward of Chile's longitudinal system would bring Coquimbo into direct communication with Santiago. In all Heteronemertines there is on each side of the head a longitudinal slit of varying length but generally considerable depth, in the bottom of which the dark red brain is very plainly visible by transparency. This typically consists of two concentric zones, the trochus and cingulum, often separated by a groove or gutter which may be finely ciliated; but in several genera of no close affinity, where it is very oblique to the longitudinal axis of the body, it is represented by a general ciliation of the surface (Taphrocampa, Rattulus, Copeus, Adineta). The liver first appears as an ento dermal hollow longitudinal outgrowth from the duo denum into the ventral mesentery. The speed of these two motions depends much on the length of the span and of the longitudinal run, and on the nature of the work to be done; in certain cases, e.g. By longitudinal segmentation we have a leaf formed consisting of sheath, stalk and blade; or one or other of these may be absent, and thus stalked, sessile, sheathing, &c., leaves are produced. ), the mandrill, Papio maimon, constitutes the subgenus Maimon, which is exclusively West African in distribution, and characterized, among other peculiarities, by the extreme shortness of the tail, and the great development of the longitudinal bony swellings, covered during life with naked skin, on the sides of the muzzle. In addition to the musculature of the proboscis and proboscidian sheath, longitudinal muscular fibres are found in the walls of the oesophagus, whilst transverse ones are numerous and united into vertical dissepiments between the successive intestinal caeca, thus bringing about a very regular internal metamerization. Twisting a circularly magnetized wire produces longitudinal magnetization. The nervous system, though centralized at one end of the body, contains diffused nerve-cells in the course of its tracts, which are disposed in two or more longitudinal bundles interconnected by transverse bands. It may still be enough to cause long term damage or weakness in the cortical areas above in the central longitudinal fissure.

However, in the Himalaya upwards of 80% of flow in the major longitudinal rivers is glacial meltwater. Test your vocabulary with our 10-question quiz! Baron divides the flora into three distinctly marked " regions," which run in a longitudinal direction, following approximately the longer axis of the island, and are termed respectively eastern, western and central. At the base of each wing projects a dorsal lobe - the jugumand the neuration is predominantly longitudinal, resembling so closely that of the lower Lepidoptera (q.v.) Most of the piles driven in Great Britain have been made on the Hennebique system with four or six longitudinal steel rods tied together by stirrups or loops at frequent intervals. A part of the time-dependent variations observed in archaeomagnetic field models consists of episodic longitudinal drifts with a similar periodicity. The humerus lacks a foramen at the lower end; and the molar teeth, as explained and illustrated in the article Vole, consist of two longitudinal rows of triangular alternating vertical prisms, and may be either rootless or rooted. This was seen in longitudinal sections, as shown in fig. The first two premolars are compressed, with cutting longitudinal edges, the anterior one is deciduous, being lost about the time the second one replaces the milk-molar, so that three premolars are never found in place and use in the same individual. You also have the option to opt-out of these cookies. The internal tissue of the body of the solid higher Fungi, particularly the elongated stalks (stipes) of the fructifications of the Agarics, consists of hyphae running in a longitudinal direction, which no doubt serve for the conduction of organic food substances, just as do the trumpet-hyphae, similar in appearance, though not in origin, of the higher Brown Seaweeds. Types include linear, oblique, transverse, longitudinal, and spiral fractures. Females have a yellow abdomen with two prominent longitudinal black bands on the upper surface. At other times the spores are divided by both transverse and longitudinal septa producing the muriform (murali-divided) spore so called from the resemblance of the individual chambers to the stones in a wall. Accessed 21 Jul.

The chief vessels are three longitudinal trunks, a median and two lateral ones. Changing electoral boundaries over the twenty year period have made a longitudinal analysis of ward data virtually meaningless. Where the depth to rail-level was too great for cut-and-cover methods, ordinary tunnelling processes were used; and where the trench was too shallow for the arched roof, heavy girders, sometimes of cast iron, bridged it between the side walls, longitudinal. More from Merriam-Webster on longitudinal wave, Britannica.com: Encyclopedia article about longitudinal wave. It then often retains its vitality for a long time, apparently crawling as if it were itself a worm, a phenomenon which is at least partially explained by the extraordinary development of nervous tissue, equally distributed all through the walls of the proboscis, and either united into numerous longitudinal nerve-stems (Drepanophorus, Amphiporus) or spread out into a uniform and comparatively thick layer (Cerebratulus, sp.). In most male batrachians the testes are drained by transverse canals which open into a longitudinal duct, which also receives the canals of the kidneys, so that this common duct conveys both sperma and urine.

All rights reserved. The great longitudinal valley of Chile runs approximately, but only approximately, along the boundary between the two zones. It occurs in two different forms. The scales are sometimes rounded behind, but generally rhombic in shape and more or less elongate; they may be quite smooth or provided with a longitudinal ridge or keel in the middle line. Behind this slate crest spreads a confused multitude of hills, Jurassic and Cretaceous in their formation.. Longitudinal studies--A longitudinal study provides information about human development over an extended period of time.

Until recently the process has been considered as an actual longitudinal splitting of the flagellum, following upon the separation of the two daughter-kinetonuclei. Delivered to your inbox! The gill-pores occur on each side of the dorsal aspect of the worm in a longitudinal series at the base of a shallow groove, the branchial groove. Besides the circular subumbral muscles, there may be others running in a radial direction, chiefly developed as the longitudinal retractor muscles of the manubrium. Traditionally, swimwear companies have attacked this problem from a longitudinal aspect. Reproduction by longitudinal fission is habitual and frequent in this species. In the catkin shown in longitudinal section in fig. Seen from an eminence on their surface, the inference is irresistible that these plateaus are fragments of the original tableland, trenched into segments by the formation of the longitudinal and transverse valleys. Some of them are relics of the longitudinal moraines of the ice-sheet, and they run north-west to south-east, parallel to the striation of the rocks and to the countless parallel troughs excavated by the ice in the hard rocks in the same direction; while the Lojo As, which runs from HangOudd to Vesi-jarvi, and is continued farther east under the name of Salpausellia, parallel to the shore of the Gulf of Finland, are remainders of the frontal moraines, formed at a period when the ice-sheet remained for some time stationary during its retreat. In addition, some show duplication of the gonads and of their ducts, so that we find both transverse and longitudinal repetition of these organs, without corresponding multiplication of the nervous ganglia mesenchyma, or excretory opening. The species resembles a wolf in size, and is greyish-brown in colour, marked with indistinct longitudinal stripes of a darker hue, while the legs are transversely striped. The Chu rises in the Tian-shan Mountains and flows north-westwards through Akmolinsk; and the Naryn flows south-westwards along a longitudinal valley of the Tian-shan, and enters Ferghana to join the Syr-darya. In humming-birds and petrels the trachea is partly divided by a vertical, longitudinal, cartilaginous septum. In mammals both caecum and colon are often sacculated, a disposition caused by the arrangement of the longitudinal bands of muscular tissue in their walls; but the small intestine is always smooth and simple-walled externally, though its lining membrane often exhibits contrivances for increasing the absorbing surface without adding to the general bulk of the organ, such as the numerous small tags, or " villi," by which it is everywhere beset, and the more obvious transverse, longitudinal, or reticulating folds projecting into the interior, met with in many animals, of which the " valvulae conniventes " of man form well-known examples. But it varies much in form and scaling, and some most aberrant varieties have been fixed by artificial selection, the principal being the king-carp or mirror-carp, in which the scales are enlarged and reduced in number, forming more or less regular longitudinal series on the sides, and the leather-carp, in which the scales have all but disappeared, the fish being covered with a thick, leathery skin. In both orographical systems the principal rivers start nearly all together from a central nucleus, and in both cases they radiate to opposite quarters of the compass; but whereas in the Alps the Rhone and the Rhine, flowing south-west and north-east respectively, follow longitudinal valleys, and the Aar and the Ticino, flowing north-west and south-east respectively, follow transverse valleys, in the Caucasus the streams which flow south-west and north-east, namely, the headwaters of the Rion and the Terek, travel along transverse valleys, and those of the Kura and the Kuban, flowing south-east and north-west respectively, traverse longitudinal valleys. A dock-side crane unloading cargo with high lifts following one another in rapid succession will require a higher load factor than a workshop traveller with a very short lift and only a very occasional maximum load; and a traveller with a very long longitudinal travel will require a higher load factor for the travelling motor than for the lifting motor. In the longitudinal section the corresponding parts are shown. He also helped to create the factory system of manufacture. Beyond, again, lies a broad furrow, or ` longitudinal fold,' as geologists call it, parallel to the ridges, and then rises the last elevation, a belt of low calcareous hills, on which, here and there among the waves of beech forest, purple or blue with distance, a white cliff retains its local colour and shines like a patch of fresh snow. As they pass into this position they undergo a longitudinal splitting by which the chromatin in each chromosome becomes divided into equal halves. About the same time the government began the construction of a longitudinal trunk line running southward from Santiago midway between the Andes and the Coast range, and connecting with all the provincial capitals and prominent ports. Restoration of Stem, shown partly in transverse and longitudinal section, partly in surface view. But the waves on the surface of a liquid, which are not of the sound kind, are both longitudinal and transverse, the compound nature being easily seen in watching the motion of a floating particle. Usually the epidermis is immediately followed by the circular layer of muscles, and this by the longitudinal coat.