In 1953, Bekesy reported the observation of shearing motion within the cochlear duct, specifically as occurring between the organ of Corti and the tectorial membrane. The direction of this alternating shear motion for any given frequency depended upon the location re the place of maximal transversal displacement of the cochlear duct as a whole. Proximally to the maximum the shear was radially, and distally it was longitudinally directed. This phenomenon was studied with the aid of cochlear models. Not only were Bekesy's original observations confirmed, but the model experiments lend themselves to a simple explanation. Although the displacement of the cochlear duct is commonly represented as a wave pattern with a varying longitudinal curvature only, in reality there are curvatures in both the longitudinal as well as the radial directions because of the fixation of the partition along both of its rims. The shear motion then follows the direction of the dominant curvature in each region which, with reference to the place of maximal transversal displacement, is radially in the proximal region, and longitudinal in the distal region, with a zone of transition at the place of the maximum itself. (Note—directional terms were used here as apply to actual cochleae.) [This work was supported in part by the U. S. Air Force under Contract No. AF 41(657)‐148, monitored by the School of Aviation Medicine, U. S. Air Force, Randolph Air Force Base, Texas and by a National Institute of Health Grant No. B‐1909.]
{"title":"Shearing motion in scala media of cochlear models.","authors":"J. Tonndorf","doi":"10.1121/1.1908025","DOIUrl":"https://doi.org/10.1121/1.1908025","url":null,"abstract":"In 1953, Bekesy reported the observation of shearing motion within the cochlear duct, specifically as occurring between the organ of Corti and the tectorial membrane. The direction of this alternating shear motion for any given frequency depended upon the location re the place of maximal transversal displacement of the cochlear duct as a whole. Proximally to the maximum the shear was radially, and distally it was longitudinally directed. This phenomenon was studied with the aid of cochlear models. Not only were Bekesy's original observations confirmed, but the model experiments lend themselves to a simple explanation. Although the displacement of the cochlear duct is commonly represented as a wave pattern with a varying longitudinal curvature only, in reality there are curvatures in both the longitudinal as well as the radial directions because of the fixation of the partition along both of its rims. The shear motion then follows the direction of the dominant curvature in each region which, with reference to the place of maximal transversal displacement, is radially in the proximal region, and longitudinal in the distal region, with a zone of transition at the place of the maximum itself. (Note—directional terms were used here as apply to actual cochleae.) [This work was supported in part by the U. S. Air Force under Contract No. AF 41(657)‐148, monitored by the School of Aviation Medicine, U. S. Air Force, Randolph Air Force Base, Texas and by a National Institute of Health Grant No. B‐1909.]","PeriodicalId":90304,"journal":{"name":"Project report. USAF School of Aviation Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1959-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89660390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Some theoretic aspects of the use of inert gases in sealed cabin environments.","authors":"E ROTH","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":90304,"journal":{"name":"Project report. USAF School of Aviation Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1959-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32130983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results arp reported from studies on the effects of lethal and sublethal doses of radiation on the spleen adenosine nucleotide levels of rats, mice, and guinea pigs. The adenosine nucleotides were separated from tissue samples by ion- exchange chromatography using Dowex-1 resin. The predominant change produced by whole-body exposure to 400 to 800 r of x radiation was on the adenosine triphosphate levels. Less significant changes were noted in the total adenosine nucleotide, adenylic acid, and adenosine diphosphate levels of the spleen. Data are presented graphically on nucleotide levels measured for 14 days after exposure. (C.H.)
{"title":"Effect of x-irradiation on spleen nucleotide levels.","authors":"E. Uyeki","doi":"10.2307/3570741","DOIUrl":"https://doi.org/10.2307/3570741","url":null,"abstract":"Results arp reported from studies on the effects of lethal and sublethal doses of radiation on the spleen adenosine nucleotide levels of rats, mice, and guinea pigs. The adenosine nucleotides were separated from tissue samples by ion- exchange chromatography using Dowex-1 resin. The predominant change produced by whole-body exposure to 400 to 800 r of x radiation was on the adenosine triphosphate levels. Less significant changes were noted in the total adenosine nucleotide, adenylic acid, and adenosine diphosphate levels of the spleen. Data are presented graphically on nucleotide levels measured for 14 days after exposure. (C.H.)","PeriodicalId":90304,"journal":{"name":"Project report. USAF School of Aviation Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1959-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76519667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Microbiologic studies on ecologic considerations of the Martian environment.","authors":"I DAVIS, J D FULTON","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":90304,"journal":{"name":"Project report. USAF School of Aviation Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1959-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32131582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Carbon monoxide capacity measurement on human and rat skeletal muscle.","authors":"J P ELLIS, R T CLARK, S S WILKS, D CRISCUOLO","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":90304,"journal":{"name":"Project report. USAF School of Aviation Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1959-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32131598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Serum lipid and lipoprotein concentrations in military academy graduates--trends from 1952 through 1958.","authors":"M F ALLEN, L J MILCH","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":90304,"journal":{"name":"Project report. USAF School of Aviation Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1959-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32135176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Parotid fluid, serum, and urine 17-hydroxycorticosteroids following a two-hour intravenous infusion of adrenocorticotropin.","authors":"I L SHANNON, J R PRIGMORE, R A BROOKS, R FELLER","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":90304,"journal":{"name":"Project report. USAF School of Aviation Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1959-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32130991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1959-10-01DOI: 10.1093/milmed/125.3.195
Allen Mf, Milch Lj
Abstract : Biennial measurements of serum cholesterol, phospholipid, low and high density lipoprotein concentrations, and body weight are recorded for a group of more than 400 men who have been followed from average age 19.6 through 27.5 years. In general, serum lipid and low density lipoprotein concentrations increased between 1952 and 1958, and either remained unchanged or decreased slightly between 1958 and 1960. The high density lipoprotein concentration decreased in each sample year since first measured in 1956.
{"title":"Serum lipid and lipoprotein concentrations in military academy graduates--trends from 1952 through 1958.","authors":"Allen Mf, Milch Lj","doi":"10.1093/milmed/125.3.195","DOIUrl":"https://doi.org/10.1093/milmed/125.3.195","url":null,"abstract":"Abstract : Biennial measurements of serum cholesterol, phospholipid, low and high density lipoprotein concentrations, and body weight are recorded for a group of more than 400 men who have been followed from average age 19.6 through 27.5 years. In general, serum lipid and low density lipoprotein concentrations increased between 1952 and 1958, and either remained unchanged or decreased slightly between 1958 and 1960. The high density lipoprotein concentration decreased in each sample year since first measured in 1956.","PeriodicalId":90304,"journal":{"name":"Project report. USAF School of Aviation Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1959-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79831657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A simple and rapid polarographic method for blood oxygen determination.","authors":"J R NEVILLE","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":90304,"journal":{"name":"Project report. USAF School of Aviation Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1959-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32129400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Some evidence suggesting the perception of moderate-intensity radiation among albino rats.","authors":"L C LOGIE, W L BROWN, J S PIZZUTO, J E OVERALL","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":90304,"journal":{"name":"Project report. USAF School of Aviation Medicine","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1959-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32129378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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