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T.-I.-T. journal of life sciences最新文献

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Schedule-induced drinking: entrainment by fixed- and random-interval schedule-controlled feeding. 计划性饮酒:由固定间隔和随机间隔计划性控制的喂养引起的。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
J D Keehn, M Burton
{"title":"Schedule-induced drinking: entrainment by fixed- and random-interval schedule-controlled feeding.","authors":"J D Keehn,&nbsp;M Burton","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Six underweight rats drank in a polydipsic pattern of single post-reinforcement bursts of licking before bar-pressing for subsequent food reinforcers scheduled at fixed 60-sec intervals. With a 60-sec random interval schedule they frequently oscillated between barpressing and drinking. On both schedules mean drink durations were shorter than average inter-reinforcement times, but longer drinks occurred under the fixed-interval schedule. We concluded that intermittent reinforcement entrains drinking because food plus water is more reinforcing than dry food alone, and that polydipsia develops when opportunities for drinking do not compete with opportunities for feeding.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 3-4","pages":"93-7"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11954164","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}
引用次数: 0
The cardiovascular system simulated mathematically for normal and defective states. 心血管系统对正常和缺陷状态进行数学模拟。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
J Dagan, U Levi
{"title":"The cardiovascular system simulated mathematically for normal and defective states.","authors":"J Dagan,&nbsp;U Levi","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 1-2","pages":"47-53"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11941769","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}
引用次数: 0
Effect of alternating magnetic fields (60--100 gauss, 60 Hz) on Tetrahymena pyriformis. 交变磁场(60—100高斯，60赫兹)对梨形四膜虫的影响。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
F L Tabrah, D L Guernsey, S C Chou, S Batkin
{"title":"Effect of alternating magnetic fields (60--100 gauss, 60 Hz) on Tetrahymena pyriformis.","authors":"F L Tabrah,&nbsp;D L Guernsey,&nbsp;S C Chou,&nbsp;S Batkin","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Tetrahymena pyriformis and neuroblastoma cells were studied following exposure to low intensity low frequency alternating magnetic fields. Tetrahymena showed cytomorphologic changes, with delayed and reduced cell division concurrent with increased oxygen uptake. The resulting dead cells appeared intact, as compared with dissolution characteristic of the control group. In contrast, magnetically exposed actively growing neuroblastoma cells showed no growth alterations in vitro, but were affected when exposed in vivo.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 3-4","pages":"73-7"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11332608","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}
引用次数: 0
Corrosion rates of dental amalgam in Ringer solutions and artificial saliva. 牙汞合金在林格液和人工唾液中的腐蚀速率。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
E Barón C, C M Marschoff, P J Aragón
{"title":"Corrosion rates of dental amalgam in Ringer solutions and artificial saliva.","authors":"E Barón C,&nbsp;C M Marschoff,&nbsp;P J Aragón","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Corrosion currents of dental amalgams in Ringer solution, Ringer lactate solution and an artificial saliva were determined as a function of flow rate using the linear polarization technique. The obtained results show that corrosion is far more intense in Ringer solutions than in saliva. Also, flow rate dependence is evident for Ringer solutions but not for saliva in the range investigated.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 3-4","pages":"105-10"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11954162","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}
引用次数: 0
The effect of location of muscle spindle on the predicted reflex control of muscle length. 肌纺锤体位置对预测肌长反射控制的影响。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
M Lord
{"title":"The effect of location of muscle spindle on the predicted reflex control of muscle length.","authors":"M Lord","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The location of muscle spindles is such that the length transduced by their end-organs may not represent the total 'origin-to-insertion' length of the muscle. The tendons at least lie in series with the spindles. Using a muscle model based on biceps brachii in man, a length-control senrosystem utilizing feedback either from the total muscle length, or from the 'internal length' of the contractile central region, is modelled on the analog computer. The difference in the nature of the closed-loop regulatory system thus achieved is demonstrated. Anomalous behavior is seen, in that as the length feedback becomes effective the total system response approaches that of a simple mass/spring system in one instance.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 1-2","pages":"41-6"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11940787","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}
引用次数: 0
Antidiuretic hormone secretion and urine flow in aged catheterized patients. 老年导尿患者抗利尿激素分泌与尿流的关系。
T.-I.-T. journal of life sciences Pub Date : 1978-01-01
R Luboshitzky, P Lavie, Y Sok, S M Glick, D Leroith, Z Shen-Orr, D Barzilai
{"title":"Antidiuretic hormone secretion and urine flow in aged catheterized patients.","authors":"R Luboshitzky,&nbsp;P Lavie,&nbsp;Y Sok,&nbsp;S M Glick,&nbsp;D Leroith,&nbsp;Z Shen-Orr,&nbsp;D Barzilai","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Repeated measurements of urine flow, every 10 min, and plasma ADH levels, every 20 min, were done in six aged, supine catheterized patients for seven hours. Orthogonal spectral analysis revealed 80 to 130 ultradian rhythms in urinary osmolality and in Na+ and K+ concentrations, but not in the flow of urine that fluctuated rapidly. Plasma ADH levels were constant, ranging from 0.5 pg/ml to 1.5 pg/ml, without evidence for pulsatile episodic secretion.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"8 3-4","pages":"99-103"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11954165","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}
引用次数: 0
Effect of skin surface temperature on localization error and two-point threshold. 皮肤表面温度对定位误差和两点阈值的影响。
T.-I.-T. journal of life sciences Pub Date : 1977-01-01
A M Prestrude, S M Johnstone
{"title":"Effect of skin surface temperature on localization error and two-point threshold.","authors":"A M Prestrude,&nbsp;S M Johnstone","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The average localization error and two-point threshold were determined from 9 subjects at 5 skin temperatures on the volar forearm. The temperatures were physiological zero (31 degrees--32 degrees C), 19 degrees C, 25 degrees C, 38 degrees C, and 44 degrees C. Localization error was not significantly affected by skin surface temperature. This was verified on palm and forehead locations. The two-point threshold was increased by skin surface temperatures above physiological zero and decreased by skin surface temperatures below physiological zero. These results are consistent with a previous report of similar changes in punctate pressure sensitivity with varied skin surface temperatures. Such cross-model effects are considered in terms of cutaneous sensory mechanisms combining broad receptor specificity and subsequent coding of information by patterns of neural impulses.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"7 3-4","pages":"59-64"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11816883","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}
引用次数: 0
The dipole layer as a model for scalp potentials. 偶极子层作为头皮电位的模型。
T.-I.-T. journal of life sciences Pub Date : 1977-01-01
P Nunez
{"title":"The dipole layer as a model for scalp potentials.","authors":"P Nunez","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Estimates are made of the potential field at the scalp and cortical surfaces due to large numbers of synchronously active cortical current sources. The basic model is a dipole layer in an infinite, homogeneous conducting medium. Estimates are made of the effects of various inhomogeneities on the attenuation of potentials. It is shown that these approximate methods seem to illuminate the following questions which are of interest in EEG research: (1) The interpretation of reference recordings in terms of local source currents; (2) The differences in amplitude between scalp and cortical recordings; (3) The differences in frequency spectra between scalp and cortical recordings; (4) The observation that alpha rhythm can be recorded deep in the brain; and (5) The effects of simple inhomogeneities on the attenuation of potentials.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"7 3-4","pages":"65-72"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11816885","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}
引用次数: 0
Computerized brain impedograph. 电脑脑阻抗仪。
T.-I.-T. journal of life sciences Pub Date : 1977-01-01
L Adam
{"title":"Computerized brain impedograph.","authors":"L Adam","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Design of an on-line system utilizing a minicomputer and a specific dedicated hardware for 2T brain tissue impedance is provided. The prototype system, which can operate from 2 Hz to 10 kHz, covers most of the frequency range of interest in the encephalographic research. Driving the brain tissue with constant current and sampling the response current and voltage, the coefficients for a Fourier series expansion can easily be obtained. Real (resistance) and imaginary (capacitance) impedance components at each chosen frequency are printed on a Teletype printer.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"7 3-4","pages":"73-5"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11816887","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}
引用次数: 0
A difference in the effects of ethanol on ion movements in cerebral tissue slices from alcohol preferring and alcohol avoiding rats. 乙醇对嗜酒和避酒大鼠脑组织切片中离子运动影响的差异。
T.-I.-T. journal of life sciences Pub Date : 1977-01-01
P Nikander, P v Boguslawsky
{"title":"A difference in the effects of ethanol on ion movements in cerebral tissue slices from alcohol preferring and alcohol avoiding rats.","authors":"P Nikander,&nbsp;P v Boguslawsky","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The sodium and potassium contents in cerebral cortex slices incubated in bicarbonate medium from alcohol preferring (AA) and alcohol avoiding (ANA) rats were measured during electrical stimulation and subsequent recovery. The intracellular quantities were estimated on the basis of the inulin distribution. The amount of intracellular potassium in unstimulated slices from the two strains was different, the AA rats showing a higher level. No differences in the entry of sodium were observed for the two strains when slices incubated with ethanol were subjected to electrical stimulation, but the loss of potassium was 46% greater in the AA rats. During recovery no ethanol-induced inhibition of theloss of sodium ions was seen in either strain, whereas the gain of potassium ions was inhibited in the ANA rats and not in the AA RATS. The potassium gain in the presence of ethanol was 42% greater during the recovery period in the AA rats.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"7 1-2","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12083127","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}
引用次数: 0
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