| 单词 | Schwann |
| 例句 | A wag once said that Neeme Järvi seemed intent upon recording the Schwann catalog, which at the time meant everything in sight. Neeme Jarvi leads L.A. Phil through Brahms, Suk's rhapsodic Fantasie 2015-04-18T04:00:00Z Almost a decade ago, regeneration biologist Anura Rambukkana of the University of Edinburgh and colleagues found leprosy-causing bacteria invade cells called Schwann cells that embrace neurons. Leprosy spurs growth in armadillo livers, offering clues to organ regeneration 2022-11-15T05:00:00Z The Schwann cells are separated by gaps of unmyelinated fibers called nodes of Ranvier over which the nerve impulse travels as the signal passes along the neuron, increasing the speed of transmission. Biology for AP Courses 2022-06-09T00:00:00Z In 1855, Theodor Schwann stated that all animals are made of cells. Miller & Levine Biology 2018-01-01T00:00:00Z Outside the plasma membrane of the axon is the myelin sheath, which is composed of the tightly wrapped plasma membrane of a Schwann cell. Anatomy and Physiology 2013-06-19T00:00:00Z They studied how the SARS-CoV-2 virus interacts with inner ear cells like hair cells, nerve fibers, supporting cells and neuron insulators known as Schwann cells. COVID-19 can infect the ears — causing a chronic condition some call "Covid ear" 2021-11-19T05:00:00Z Like the Schwann cells in their previous work, liver cells in armadillos that harbored the bacteria became more like stem cells. Leprosy spurs growth in armadillo livers, offering clues to organ regeneration 2022-11-15T05:00:00Z This is distinctive from the PNS where a single Schwann cell provides myelin for only one axon as the entire Schwann cell surrounds the axon. Biology for AP Courses 2022-06-09T00:00:00Z Moreover, new forms of support for peripheral nerve glial cells known as Schwann cells may also help persuade reluctant nerves to regrow. Readers Respond to the January 2021 Issue 2021-05-23T04:00:00Z The second type of glial cell is the Schwann cell, which insulate axons with myelin in the periphery. Anatomy and Physiology 2013-06-19T00:00:00Z They also showed behaviour including licking, shaking and guarding of their paws – signs that stimulating these Schwann cells caused pain. Scientists discover new pain-sensing organ 2019-08-15T04:00:00Z Schwannomas arise from nerve cells called Schwann cells, which are part of the peripheral nervous system. At night she suffered through searing pain, by morning it mysteriously vanished 2018-05-25T04:00:00Z Just why Schwann and glial cells appear to be targets of cell phone radiation is not clear. New Studies Link Cell Phone Radiation with Cancer 2018-03-29T04:00:00Z She then gives an insightful historical account starting from nineteenth-century giants including Theodor Schwann and Rudolf Virchow. Cancer therapy: Defining stemness : Nature : Nature Publishing Group 2016-06-07T04:00:00Z Schwann cells are different than oligodendrocytes, in that a Schwann cell wraps around a portion of only one axon segment and no others. Anatomy and Physiology 2013-06-19T00:00:00Z The team’s biggest finding was that these Schwann cells can sense pain. Scientists discover new pain-sensing organ 2019-08-15T04:00:00Z Schwannomas are tumors of the Schwann cells, which line nerve cells. Study linking tumors in rats to cellphones raises a host of questions 2016-05-27T04:00:00Z Of particular concern are benign Schwann cell tumors called acoustic neuromas, which affect nerve cells connecting the inner ear with structures inside the brain. New Studies Link Cell Phone Radiation with Cancer 2018-03-29T04:00:00Z The hearts of 2% to 6% of male rats in the cellphone groups also developed a tumor in what’s known as a Schwann cell, which is part of the sheath around nerves. Questions abound after study links tumors to cellphone radiation 2016-05-27T04:00:00Z Oligodendrocytes have processes that reach out to multiple axon segments, whereas the entire Schwann cell surrounds just one axon segment. Anatomy and Physiology 2013-06-19T00:00:00Z They then compared that behaviour with the animals’ responses when light was used to slightly activate these Schwann cells, making them more sensitive, or to deactivate them. Scientists discover new pain-sensing organ 2019-08-15T04:00:00Z Schwannomas are usually benign tumors of the Schwann cells, which line nerve cells. Study Linking Tumors in Rats to Cellphones Raises a Host of Questions 2016-05-27T04:00:00Z Samet adds a major challenge now would be to draw a biologically relevant connection between acoustic neuromas and other glial tumors in the brains of humans with Schwann tumors in rat hearts. New Studies Link Cell Phone Radiation with Cancer 2018-03-29T04:00:00Z “It’s certainly a watershed document in the history of Vermont,” said Rick Stattler, Americana specialist at Schwann. Ethan Allen arrest warrant to be auctioned 2015-04-11T04:00:00Z The nucleus and cytoplasm of the Schwann cell are on the edge of the myelin sheath. Anatomy and Physiology 2013-06-19T00:00:00Z These are a type of Schwann cell, which wrap around and engulf nerve cells and help to keep them alive. Scientists discover new pain-sensing organ 2019-08-15T04:00:00Z And in an Investor Day presentation last September, Roche CEO Severin Schwann stressed that his company is able to keep prices and margins high because of its focus on “medically differentiated therapies.” Bitter Pill: Why Medical Bills Are Killing Us 2013-02-21T10:50:22Z The researchers isolated Schwann cells from mice and infected them with M. leprae—and were soon surprised by what they saw. Leprosy Reprograms the Body 2013-01-17T17:00:00Z The F.D.A. approvals of Schwann cell transplantation opens the door for therapy in humans. 30 Seconds: With Nick Buoniconti 2012-09-22T22:01:08Z In the PNS, satellite cells are supporting cells for the neurons, and Schwann cells insulate peripheral axons. Anatomy and Physiology 2013-06-19T00:00:00Z The study has revealed these Schwann cells have an octopus-like shape. Scientists discover new pain-sensing organ 2019-08-15T04:00:00Z Schwann cells will then be harvested from each patient’s leg, grown and purified in Petri dishes for 26 to 40 days, and transplanted into the spine. A Breakthrough for Spinal Cord Injury Research? 2012-07-31T22:05:33Z Rambukkana hopes that future studies will shed more light on how the leprosy bacterium transforms Schwann cells. Leprosy Reprograms the Body 2013-01-17T17:00:00Z Different investigators found that animal tissue is also composed of cells; and between 1835 and 1839 Schwann and Schleiden formulated the law that every metazoic organism is made of cells, and starts from a cell. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z Other cells in the nervous tissue, the neuroglia, include the astrocytes, microglia, oligodendrocytes, and Schwann cells. Anatomy and Physiology 2013-06-19T00:00:00Z As the pulses of light increased in duration, the number of nearby nerve cells firing increased, supporting the idea that these Schwann cells send a signal to the brain through the nerve cells. Scientists discover new pain-sensing organ 2019-08-15T04:00:00Z Since their own Schwann cells will be used in the transplants, there won’t be any risk of rejection. A Breakthrough for Spinal Cord Injury Research? 2012-07-31T22:05:33Z A physicist less famous than Huxley, Schwann, some half a century before Huxley’s day, is said to have been the first to criticize the abiogenesis doctrine as supported by no sufficient evidence. Social Transformations of the Victorian Age A Survey of Court and Country 2012-02-29T03:00:22.540Z Theodore Schwann, the discoverer of the cell doctrine, deemed her condition natural. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z For Schwann cells, the outermost layer of the cell membrane contains cytoplasm and the nucleus of the cell as a bulge on one side of the myelin sheath. Anatomy and Physiology 2013-06-19T00:00:00Z To explore what else might activate these Schwann cells, the team exposed the feet of the mice to heat, cold and pinpricks and looked at their behaviour. Scientists discover new pain-sensing organ 2019-08-15T04:00:00Z What the FDA is permitting — and what The Miami Project announced today — is preliminary, or Phase I, trials of Schwann cell transplants in humans. A Breakthrough for Spinal Cord Injury Research? 2012-07-31T22:05:33Z Another feature determining the success of Schwann’s work was his selection of embryonic tissue as material for investigation. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z Mr. Schwann has written a volume which will enhance a most promising reputation. Psyche 2011-11-15T03:00:18.293Z A single Schwann cell insulates a segment of a peripheral nerve, whereas in the CNS, an oligodendrocyte may provide insulation for a few separate axon segments. Anatomy and Physiology 2013-06-19T00:00:00Z With the special Schwann cells and the nerves they engulf forming a mesh-like network, the researchers say they have essentially discovered a new pain-sensing organ. Scientists discover new pain-sensing organ 2019-08-15T04:00:00Z Schwann cells are not present in the brain and spinal cord. Preliminary Human Experiments to Test Safety of Paralysis Treatment Using Nerve Cells 2011-10-19T17:15:02.380Z But the first real step to a comprehensive cell-theory to include animal tissues was made by Theodor Schwann. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z “There is no finer passage in Mr. Schwann’s book than that in which he describes with vivid realistic power, but without mentioning names, the gathering passion engendered by a great debate.” Psyche 2011-11-15T03:00:18.293Z But then the Schwann cells began to glow as well. The Hidden Brain (preview) 2011-06-08T13:15:00.213Z He said questions remained, including how the Schwann cells transmit a signal to the pain-sensitive nerve cells. Scientists discover new pain-sensing organ 2019-08-15T04:00:00Z No immunosuppressive drugs would be required for Schwann cell transplants, because the cells are from the patient’s own body. Preliminary Human Experiments to Test Safety of Paralysis Treatment Using Nerve Cells 2011-10-19T17:15:02.380Z And just as Treviranus showed that there was a union of cells to form the vessels in plants, so Schwann now showed that a union of cells frequently occurred in the formation of animal tissues. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z That is the question which Mr. Duncan Schwann, M.P., worthy son of a worthy father, sets out to answer in a book of singular grace and charm.... Psyche 2011-11-15T03:00:18.293Z Schwann was also responsible for initiating a number of minute physiological investigations which led to a far more intimate knowledge of the action of nerves and muscles, and interpreted these in mechanical terms. Religion and Science From Galileo to Bergson 2011-04-07T02:00:16.760Z The discovery was made using optogenetics, which involved the researchers genetically modifying mice so Schwann cells in the skin of their feet produced a protein that could absorb light. Scientists discover new pain-sensing organ 2019-08-15T04:00:00Z Theodore Schwann, the father of the cell doctrine, did all the work for which he deserves the name of founder of modern biology when he was scarcely more than thirty. Makers of Modern Medicine 2011-03-05T03:00:29.580Z So great was the stimulus given to cytological research by the work of Schleiden and Schwann that these authors are often referred to as the founders of the cell-theory. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z Looking more closely, researchers examined the effects of removing the prion protein in both the nerve cells themselves, and the Schwann cells surrounding them, which are responsible for making the myelin sheath. 2010-01-25T00:02:00Z "The key in a vaccine is not to create immune action that would hurt the devils by attacking their Schwann cells," says Papenfuss. 2010-01-08T21:15:00Z This suggests the special Schwann cells are important in sensing pain – at least for mechanical harm. Scientists discover new pain-sensing organ 2019-08-15T04:00:00Z Theodore Schwann was the fourth of a family of thirteen children, born in the little German town of Reuss, not far from Cologne. Makers of Modern Medicine 2011-03-05T03:00:29.580Z The work of Schleiden and Schwann marks the close of the first period in the history of the cell-theory—the period dominated by the cell-wall. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z Dr. Theodore Schwann published his theory of the cellular construction of plants and animals. The Scrap Book, Volume 1, No. 4 June 1906 Schwann, the author of the cellular theory, says: “I really do not know why we die.” Christ, Christianity and the Bible Schwann showed that the formation of tissues in animals went through exactly the same progress, a fact which has been confirmed by the microscopic observations of Valentin and Barry. The Economist Volume 1, No. 3 Schwann's investigation of the respiration of the embryo in hens' eggs led to further studies of the embryo itself, and to the discovery that it was made up of cells. Makers of Modern Medicine 2011-03-05T03:00:29.580Z It was Schwann, too, who, simultaneously with Cagniard la Tour, discovered the active principle of gastric juice to be the substance which he named pepsin. A History of the Nineteenth Century, Year by Year Volume Two (of Three) "I knew he would get well!" cried Schwann, as he rushed to Gudel, and took his hands. The Son of Monte-Cristo A sixth discovery, considered more important and occupying a larger space in medical literature, is the cell doctrine of Schwann, a doctrine still under discussion and by no means a finality. Buchanan's Journal of Man, March 1887 Volume 1, Number 2 Schwann's experiments tended to show that the introduction of air—of course containing oxygen—did not lead to the production of life, if the air had first been thoroughly sterilised. Science and Morals and Other Essays Schwann settled the question definitely by a set of ingenious experiments. Makers of Modern Medicine 2011-03-05T03:00:29.580Z Schwann's book became a scientific classic almost from the moment of its publication. A History of the Nineteenth Century, Year by Year Volume Two (of Three) The two horses stepped gingerly out of Schwann's premises, and when once on the high road dashed madly forward. The Son of Monte-Cristo Schwann placed flesh in a flask filled to one-third of its capacity with water, sterilised the flask by boiling, and then supplied it for months with calcined air. Fragments of science, V. 1-2 In the further experiments which this query gave rise to, we meet with another illustrious Catholic name, that of Theodor Schwann, better known as the originator of that fundamental piece of scientific knowledge, the cell-theory. Science and Morals and Other Essays One of Schwann's brothers had been a worker in metal, and Schwann himself had always shown a great interest in mechanical appliances. Makers of Modern Medicine 2011-03-05T03:00:29.580Z The reception he met with, his amusements, occupations, and prospects are described in a letter to the Kammerrath Schwann, a bookseller at Mannheim, alluded to above. The Life of Friedrich Schiller Comprehending an Examination of His Works "I am glad to see you," muttered Schwann, half ashamed of his own emotion. The Son of Monte-Cristo The yeast-plant, as we have learned, is an assemblage of living cells; but so at bottom, as shown by Schleiden and Schwann, are all living organisms. Fragments of science, V. 1-2 The yacht which I and my friends thought that we were boarding to-night was the Christabel, which my servant had instructions to hire from Schwann of Monaco. Mr. Grex of Monte Carlo Besides his interest in histology, the branch of anatomy which treats of the intimate constitution of tissues, Schwann was working also at certain general biological questions, and at some knotty problems of physiology. Makers of Modern Medicine 2011-03-05T03:00:29.580Z With Herr Schwann, however, I will make it a condition that, at least, he print the piece according to the first plan. The Life of Friedrich Schiller Comprehending an Examination of His Works Schwann was aroused by footsteps below, and rushed down the stairs. The Son of Monte-Cristo Schwann then varied his experimental argument, with no alteration in the result. Fragments of science, V. 1-2 The yacht of this man Schwann has never been seen by my master. Mr. Grex of Monte Carlo Of the contradiction of his conclusions Schwann took practically no notice, but went faithfully on with his work. Makers of Modern Medicine 2011-03-05T03:00:29.580Z This letter is addressed to Schwann, during Schiller's first residence in Weimar: it has already been referred to in the Text. The Life of Friedrich Schiller Comprehending an Examination of His Works The persistent questions of Schwann made her very uneasy. The Son of Monte-Cristo It was Schwann's merit to interpose between the tissue and the mere unorganised material a new element of structure, the cell. Form and Function A Contribution to the History of Animal Morphology It is I who have been selected by my master to proceed to Monaco to make arrangements with the German, Herr Schwann. Mr. Grex of Monte Carlo Schwann was a German, yet had to give his lectures at Louvain in French. Makers of Modern Medicine 2011-03-05T03:00:29.580Z Letter to his friend Schwann: A marriage proposal. The Life of Friedrich Schiller Comprehending an Examination of His Works He took off his hat as Schwann approached. The Son of Monte-Cristo Theodor Schwann was a pupil of Johannes Müller, and we know that Müller took much interest in the new histology. Form and Function A Contribution to the History of Animal Morphology "It is a great scheme," Frenhofer assented, "but supposing my master should choose to telephone some small detail to the office of the man Schwann?" Mr. Grex of Monte Carlo The most marked feature of Schwann's career is the unfailing friendships that linked him to those with whom he was associated. Makers of Modern Medicine 2011-03-05T03:00:29.580Z It will help in understanding the peripheral system to remember that a nerve consists of a bundle of neurone fibers each wrapped in its medullary sheath and sheath of Schwann. The Mind and Its Education That morning the worthy Schwann, whose ancestors had kept the inn known as the Rising Sun for one hundred and fifty years, said that in all his experience he had never been so busy. The Son of Monte-Cristo Schwann's book is indeed a model of construction and cumulative argument, and even for this reason alone justly deserves to rank as a classic. Form and Function A Contribution to the History of Animal Morphology This yacht of Schwann's—the Christable, he calls it—was fitted out by a millionaire. Mr. Grex of Monte Carlo It will be recalled that Theodore Schwann was also a student of the Jesuits. Makers of Modern Medicine 2011-03-05T03:00:29.580Z Each nerve fibre consists of a number of nerve fibrils collected into a central bundle—the axis cylinder—which is surrounded by an envelope, the neurolemma or sheath of Schwann. Manual of Surgery Volume First: General Surgery. Sixth Edition. The strange costume worn by Gudel, and the equally strange name by which Schwann called him, did not seem to amaze the two strangers. The Son of Monte-Cristo Schwann had therefore a good deal of exact knowledge to go upon in discussing the significance of the ovum for the cell-theory. Form and Function A Contribution to the History of Animal Morphology There is a man named Schwann down in Monaco has a yacht for hire. Mr. Grex of Monte Carlo Then Schwann was not such a teacher as M�ller, but the true pedagogue who took seriously to heart the duty of teaching all his students. Makers of Modern Medicine 2011-03-05T03:00:29.580Z Then he went on to explain the cellular theory of Schwann, which was then a novelty to a general audience. Thomas Henry Huxley; A Sketch Of His Life And Work Schwann hurried in wiping his hands, and from under a pile of plates he drew out a paper. The Son of Monte-Cristo Schwann's attractive force brings about the actual taking up of the prepared substance; his metabolic force is the cause of the digestion of food substances, and is nearly identical with enzyme action. Form and Function A Contribution to the History of Animal Morphology Now go on your errand to the man Schwann. Mr. Grex of Monte Carlo After careful observation Schwann refused to concur in the report that the bleedings were manifestly miraculous. Makers of Modern Medicine 2011-03-05T03:00:29.580Z This doctrine is commonly regarded as being inaugurated in 1839 by Schwann. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity The Marquis entered the inn and looked around suspiciously, but saw no one but Schwann, who stood hat in hand; he did not advance, as the frown of the Marquis was far from encouraging. The Son of Monte-Cristo Between the two layers other cells are formed belonging to the vessel layer, which is, however, in Schwann's opinion not a very definitely individualised layer. Form and Function A Contribution to the History of Animal Morphology "You must hire the yacht of Schwann, just as you were instructed," Hunterleys pointed out. Mr. Grex of Monte Carlo Schwann's thesis for his doctorate at Berlin showed the calibre of the man, and demonstrated his thorough fitness for success as an experimental scientist. Makers of Modern Medicine 2011-03-05T03:00:29.580Z Finally, in 1839, these observations were combined together by Schwann into one general theory. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity "A physician is wanted," exclaimed Fanfar, turning to Schwann, who was weeping like a child. The Son of Monte-Cristo Schwann's next step is a detailed demonstration of the origin of each tissue from simple cells such as those composing the incubated blastoderm. Form and Function A Contribution to the History of Animal Morphology It is just fifty years since Schwann and others proved that, even with respect to them, the supposed evidence of abiogenesis was untrustworthy. The Advance of Science in the Last Half-Century The completeness with which the points in dispute in this problem were demonstrated is typical of all Schwann's work. Makers of Modern Medicine 2011-03-05T03:00:29.580Z Schwann and his immediate followers, while recognizing that the bodies of animals and plants were composed of cells, were at a loss to explain how these cells arose. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity Schwann appeared at the door at this moment. The Son of Monte-Cristo The cell was for Schwann not a morphological concept at all, but a physiological; the cell was a dynamical, not a statical unit. Form and Function A Contribution to the History of Animal Morphology This core is surrounded by the white substance of Schwann, or medullary sheath, which gives the nerve its characteristic ivory-white appearance. A Practical Physiology Henle, who had very little sympathy for Schwann's religious views, speaks most kindly of him as a man and a comrade. Makers of Modern Medicine 2011-03-05T03:00:29.580Z This supposed substance Schwann called the cytoblastema, and he thought it existed between the cells or sometimes within them. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity "Well!" said Schwann, to himself, "I shall not be easy until they return, for I fear that the inundation has only just begun." The Son of Monte-Cristo Schwann tries to explain the origin of the "metabolic" action, the analogy of which with the contact-action of colloidal platinum he recognises, by attributing it to the peculiar structural arrangements of molecules. Form and Function A Contribution to the History of Animal Morphology This was not done, by Schleiden for the plant and Schwann for the animal, until 1838. The Evolution of Man — Volume 1 For ten years Schwann faithfully devoted himself to his teaching duties in the anatomical course at Louvain. Makers of Modern Medicine 2011-03-05T03:00:29.580Z This the belief of Schwann, although he also regarded the other parts of the cell as of importance. The Story of the Living Machine A Review of the Conclusions of Modern Biology in Regard to the Mechanism Which Controls the Phenomena of Living Activity "And mine, too," Bobichel replied, throwing a somersault as he spoke; which he ended with a sudden leap on the shoulders of the good Schwann, who stood the shock with wonderful philosophy. The Son of Monte-Cristo Schwann was only twenty-nine when his master-work appeared, and the book is clearly the work of a young man. Form and Function A Contribution to the History of Animal Morphology The objections to Liebig's views were hardly noticed, and the force of the experiments of Schwann was silently ignored. The Story of Germ Life When, after his graduation as doctor in medicine, the post of assistant in anatomy at Berlin fell vacant, it was offered by Johann M�ller to Schwann. Makers of Modern Medicine 2011-03-05T03:00:29.580Z It seems at present necessary to abandon the original idea of Schwann, that we can observe the building up of a cell from the simple granules of a blastema, or formative fluid. Medical Essays, 1842-1882 Schwann saw that he had made a blunder, and endeavored to retrieve it. The Son of Monte-Cristo But the ovum was not, in Schwann's view, a simple cell, for within it were contained yolk-granules, one set apparently containing a nucleus, the others not. Form and Function A Contribution to the History of Animal Morphology This amounted to the logical extension and culmination of Schwann's doctrine as to the similarity of development of the two animate kingdoms. A History of Science — Volume 4 Schwann seems to have endeared himself to the "difficult" Prussians, as he did to those around him all his life. Makers of Modern Medicine 2011-03-05T03:00:29.580Z Despite these drawbacks Schwann's work was done with a completeness that leaves very little to be desired. Makers of Modern Medicine 2011-03-05T03:00:29.580Z At the hour when this chapter opens, Master Schwann had just witnessed a veritable slaughter in his poultry yard; pots and saucepans were smoking on the fire, and vigorous preparations were made in the kitchen. The Son of Monte-Cristo The relation between the unfertilised egg and the blastoderm which arises from it is not made altogether clear by Schwann. Form and Function A Contribution to the History of Animal Morphology Yet at the same time it was in effect the banishment of the cell that Schwann had defined. A History of Science — Volume 4 Schwann's first completed work at Louvain was the Microscopical Researches into the Accordance in Structure and Growth of Plants and Animals. Makers of Modern Medicine 2011-03-05T03:00:29.580Z Schwann's next step is to discover what are the essential forces active in the cell, and here he enters the realm of hypothesis. Form and Function A Contribution to the History of Animal Morphology When Schwann had laid the table and placed the dinner upon it, Cyprien took him aside. The Son of Monte-Cristo In this detail part of his book Schwann accumulates material for a general theory of the cell which he develops in the third and last section. Form and Function A Contribution to the History of Animal Morphology A troop of observers soon entered upon the study of the nerves, and the leader here, as in so many other lines of microscopical research, was no other than Theodor Schwann. A History of Science — Volume 4 His work on bile practically closes Schwann's career as an investigator. Makers of Modern Medicine 2011-03-05T03:00:29.580Z It was a medley of dogmatic materialism, idealistic morphology, and evolution theory; its sources were, approximately, Büchner, Theodor Schwann, Virchow, H. G. Bronn, and, of course, Charles Darwin. Form and Function A Contribution to the History of Animal Morphology Zounds!" muttered Schwann, as he descended the stairs, "all these airs displease me! The Son of Monte-Cristo With the founding of the cell-theory by Schwann in 1839 an important step was taken in the analysis of the degrees of composition of the animal body. Form and Function A Contribution to the History of Animal Morphology This friend was Dr. Theodor Schwann, professor of physiology in the University of Louvain. A History of Science — Volume 4 Schwann's seeming inactivity has been a fruitful cause for conjecture. Makers of Modern Medicine 2011-03-05T03:00:29.580Z Haeckel works out his materialistic philosophy of living things very much after the fashion of Schwann. Form and Function A Contribution to the History of Animal Morphology Schleiden had even supposed the nucleus to be a constituent part of the wall, sometimes lying enclosed between two layers of its substance, and Schwann quoted this view with seeming approval. A History of Science — Volume 4 It is probably to his influence that we owe Schwann's brilliant work on the cell, which appeared just after Schwann left Berlin for Löwen. Form and Function A Contribution to the History of Animal Morphology At the moment when these observations were communicated to him Schwann was puzzling over certain details of animal histology which he could not clearly explain. A History of Science — Volume 4 The work was congenial, however, and Schwann remained here for five years. Makers of Modern Medicine 2011-03-05T03:00:29.580Z Schwann believed, however, that in the mature cell the nucleus ceased to be functional and disappeared. A History of Science — Volume 4 Put so, for that matter, were numerous others, as Henle, Turpin, Du-mortier, Purkinje, and Muller, all of whom Schwann himself had quoted. A History of Science — Volume 4 It happened that, some years before Schwann wrote, a good deal of work had been done on the minute structure of the ovum, particularly by Purkinje and von Baer. Form and Function A Contribution to the History of Animal Morphology Schwann felt that this similarity could not be mere coincidence, but he had gained no clew to further insight until Schleiden called his attention to the nucleus. A History of Science — Volume 4 Had Schwann died at thirty his biographies would have surely contained lengthy comments on the great discoveries that would undoubtedly have rewarded his efforts in the prime of his powers. Makers of Modern Medicine 2011-03-05T03:00:29.580Z Schwann's researches made it plain that the best field for the study of the animal cell is here, and a host of explorers entered the field. A History of Science — Volume 4 The result of their observations was, in the main, to confirm the claims of Schwann as to the universal prevalence of the cell. A History of Science — Volume 4 Schleiden and Schwann started out from an erroneous theory of the origin and development of cells, which impaired to some extent the value of their results. Form and Function A Contribution to the History of Animal Morphology Schwann's researches soon showed the entire correctness of this assumption. A History of Science — Volume 4 Schwann was penetrated with a lively sense of the deepest religious feeling, which is noticeable all through his life. Makers of Modern Medicine 2011-03-05T03:00:29.580Z In one other important regard the theory of Schleiden and Schwann now became modified. A History of Science — Volume 4 Schwann had regarded cell growth as a kind of crystallization, beginning with the deposit of a nucleus about a granule in the intercellular substance—the cytoblastema, as Schleiden called it. A History of Science — Volume 4 This "theory of the organism," which holds so important a place in biology even at the present day, is developed by Schwann in the concluding pages of his book. Form and Function A Contribution to the History of Animal Morphology As the title suggests, the main idea that actuated Schwann was to unify vegetable and animal tissues. A History of Science — Volume 4 The circumstance led to the publication of some harsh words in the religious press, but with his usual moderation Schwann refused to enter into any discussion, and so the affair ended. Makers of Modern Medicine 2011-03-05T03:00:29.580Z Thus the nucleus was restored to the important position which Schwann and Schleiden had given it, but with greatly altered significance. A History of Science — Volume 4 Here and there a prophet of science, as Schwann and Henle, had guessed the secret; but guessing, in science, is far enough from knowing. A History of Science — Volume 4 Schwann found it easy to demonstrate the cellular nature of the tissues of his first three classes. Form and Function A Contribution to the History of Animal Morphology And by cell Schwann meant, as did Schleiden also, what the word ordinarily implies—a cavity walled in on all sides. A History of Science — Volume 4 Schwann and Pasteur remained in the midst of their great scientific triumphs her faithful sons. Makers of Modern Medicine 2011-03-05T03:00:29.580Z |
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