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T.-I.-T. journal of life sciences最新文献

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Effects of intravenous cocaine on food maintained behavior in monkeys. 静脉注射可卡因对猴子食物维持行为的影响。
T.-I.-T. journal of life sciences Pub Date : 1976-01-01
C W Morrow, D P Ferraro
{"title":"Effects of intravenous cocaine on food maintained behavior in monkeys.","authors":"C W Morrow,&nbsp;D P Ferraro","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Two Macaca mulatta and one macaca java monkey were trained to press a key for food pellets on a differential reinforcement of low rate (DRL) schedule which required consecutive key-press responses to be spaced at least 20 sec apart in order to produce reinforcement. When behavior had stabilized, the monkeys were administered either 0.0,0.05,0.10,0.25, or 0.50 mg/kg of cocaine i.v. during daily sessions. Cocaine produced a bi-component, dose-dependent effect. Immediately following cocaine infusion there was a dose-related complete cessation of responding which began and ended abruptly. Following this postinfusion pause, a dose-related behavioral disruption in the form of shortened inter-response times was observed.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"6 1-2","pages":"40-5"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12016209","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
Some possible effects of static magnetic fields. 静电磁场的一些可能影响。
T.-I.-T. journal of life sciences Pub Date : 1976-01-01
Y S Kim
{"title":"Some possible effects of static magnetic fields.","authors":"Y S Kim","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"6 1-2","pages":"11-28"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11406723","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
'Self-correcting' spherical bioelectrode. “自我校正”球形生物电极。
T.-I.-T. journal of life sciences Pub Date : 1976-01-01
E Aizinbud, H Schindler, L Adam
{"title":"'Self-correcting' spherical bioelectrode.","authors":"E Aizinbud,&nbsp;H Schindler,&nbsp;L Adam","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Most of the widely used biopotential macroscopic and microscopic bioelectrodes do not enable proper measurements while in contact with 'problematic' tissues, such as myocardial and other muscular tissues, cortical and intracavital tissues. A quantitative spherical electrode was designed as an example in the family of bioelectrodes enabling application in moving or vibrating media. The electrode developed is insensitive to its contact area. Decreasing the contact area to 40% causes 25% increase in measured resistance only. The electrode shows excellent performance in alternating current conditions combined with well-defined direct current characteristics.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"6 1-2","pages":"45-8"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12198761","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
Information processing limits: the effects of information load and age. 信息加工极限:信息负荷和年龄的影响。
T.-I.-T. journal of life sciences Pub Date : 1975-01-01
M Burns
{"title":"Information processing limits: the effects of information load and age.","authors":"M Burns","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>As a test of the effects of age and information load Ss performed a visual and auditory discrimination task under conditions requiring division of attention. Amount of stimulus information was determined by the number of stimulus alternatives which could occur in a set of trials. Performance by 12 Ss over age 40 was impaired in comparison to 12Ss under age 40. Performance for all Ss was a function of amount of information, but there was no Age X Information Load interaction. It has been reported in the literature that age-related performance decrements are correlated with task complexity. These data indicate that amount of information is not a critical dimension of task complexity as it contributes to age-related performance deficits.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"5 3-4","pages":"57-60"},"PeriodicalIF":0.0,"publicationDate":"1975-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12407829","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 use of metal microelectrodes in broad-band recording. 金属微电极在宽带记录中的应用。
T.-I.-T. journal of life sciences Pub Date : 1975-01-01
J S DuPont, C DeJong
{"title":"The use of metal microelectrodes in broad-band recording.","authors":"J S DuPont,&nbsp;C DeJong","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>We checked to what extent the voltage-current relationship of a microelectrode is linear. In the linear domain we measured the impedance characteristic of the electrode. We measured the frequency response curve and the phase characteristic of the electrode and amplifier system.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"5 3-4","pages":"69-76"},"PeriodicalIF":0.0,"publicationDate":"1975-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12407832","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
Acute and subchronic influences of tetrahydrocannabinols on water and food intake, body weight, and temperature in rats. 四氢大麻酚对大鼠水和食物摄入、体重和体温的急性和亚慢性影响。
T.-I.-T. journal of life sciences Pub Date : 1975-01-01
J O Johansson, T U Jarbe, B G Henriksson
{"title":"Acute and subchronic influences of tetrahydrocannabinols on water and food intake, body weight, and temperature in rats.","authors":"J O Johansson,&nbsp;T U Jarbe,&nbsp;B G Henriksson","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Experiment 1. The acute effects of delta9-THC (1.25, 2.50, 5.00, and 10.00 mg/kg) and delta8-THC (1.25, 2.50, 5.00, and 10.00 mg/kg) was an approximately equipotent, dose related depression of water intake in water-deprived rats. Animals given hashish, inhaled as smoke, showed a depression of water consumption comparable to rats given the highest dose of either of the synthetic THCs. Water intake after chevril smoke was similar to that seen after vehicle injections. Experiment 2. A dose related depression of water-and-food intake, and reduction of body weight with a gradual recovery was found in rats, maintained on a Limited Time of drinking schedule (LT, 2 hr) and subchronically (21 days) treated with delta9-THC (1.25, 2.50, or 5.00 mg/kg). From the 22nd day all animals were given the vehicle only for 10 days. There were no indications of withdrawal effects due to the drug termination. Reinstating the drug after the 10 day drug free period suggested an increased sensitivity to THC as compared to the 21st injection. Experiment 3. In non-deprived rats delta9-THC caused similar effect as in Exp. 2, although to less extent. From both experiments it is concluded that there is an inhibition or even loss of body weight and that food intake seems more severely depressed than water intake. The temperature recordings suggest that the predominant consequence of lower, behaviorally, effective doses of THC on rectal temperature of rats is hyperthermia rather than hypothermia. Initially this effect was most pronounced for the lowest dose (1.25 mg/kg) but with repeated injections the two higher doses (2.50 and 5.00 mg/kg) showed hyperthermia to the same extent as the lowest dose. Hypothermia was seen after a high dose of delta8-THC (20.00 mg/kg) but after 3 daily injections this effect was gone.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"5 1-2","pages":"17-27"},"PeriodicalIF":0.0,"publicationDate":"1975-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12365934","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
Pressure dependence of the carotid sinus elastic modulus in the dog. 犬颈动脉窦弹性模量的压力依赖性。
T.-I.-T. journal of life sciences Pub Date : 1975-01-01
R J Bagshaw
{"title":"Pressure dependence of the carotid sinus elastic modulus in the dog.","authors":"R J Bagshaw","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The effect of the mean intrasinusal pressure upon the dynamic elastic modulus of the carotid sinus was examined in seven dogs. In all dogs the carotid sinus elastic modulus was a direct function of the mean intrasinusal pressure, measured at the lingual artery. The carotid sinus thus appears to become progressively stiffer with increasing pressure with a consequent reduction in oscillatory strain. This reduction of oscillatory stimulation of the carotid sinus mechanoreceptors acts so as to limit the maximum gain of the carotid sinus reflex to the region of the closed loop operating pressure.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"5 1-2","pages":"43-7"},"PeriodicalIF":0.0,"publicationDate":"1975-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12365936","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
Wound healing in X-irradiated mammalian skin. x射线照射下哺乳动物皮肤的伤口愈合。
T.-I.-T. journal of life sciences Pub Date : 1975-01-01
N I Gonsalves, H B Chase
{"title":"Wound healing in X-irradiated mammalian skin.","authors":"N I Gonsalves,&nbsp;H B Chase","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Certain parameters of wound healing were investigated in mouse skin given 950 rads and 3325 rads of X-irradiation at various times relative to wounding. Increased inflammation, delayed dermal regeneration, and delayed contraction were noted in all irradiated groups. The activation of surrounding hair follicles, a process that usually accompanies wounding in mouse skin, occurred earlier, over a shorter elapsed time, and over a greater area of skin in animals irradiated prior to wounding than in the controls or in those irradiated and wounded simultaneously. Epidermal mitotic activity in wounds made at the time of irradiation was initially depressed but recovered by the second postoperative day. Wounds in pre-irradiated animals gave an unexpected result. They responded with an immediate burst of mitotic activity without the usual 24-hr lag that was seen in controls. In the pre-irradiated specimens a substantial number of cells appeared to die after dividing.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"5 3-4","pages":"77-86"},"PeriodicalIF":0.0,"publicationDate":"1975-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12407601","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 role of the surrounding tissue in the propagation of waves through the arterial system. 周围组织在波通过动脉系统传播中的作用。
T.-I.-T. journal of life sciences Pub Date : 1975-01-01
U Dinnar
{"title":"The role of the surrounding tissue in the propagation of waves through the arterial system.","authors":"U Dinnar","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A theoretical analysis of the flow in arteries is presented, taking into consideration the role played by the surrounding tissues in determining the speed of propagatoion and the damping of the blood pressure pulse. This study was undertaken (a) to exhibit a method of computing the flow properties with a more nearly accurate model, (b) to see if the displacement on the skin would be related to the arterial wall displacement, and hence to pressure, velocity and flow rate of blood in the artery, and if it is likely to be measurable. It was found that the pressure of the 'viscous' part in the surrounding tissue increases the pulse velocity and the damping of the wave over the values found by other models which considered only thick-walled elastic tubes with no surrounding tissue. This study also shows that measurements on the skin can provide information about changes in arterial circulation due to diseases such as: edema, arteriosclerosis and others where the Young's modulus for either the arterial wall or the surrounding tissues is altered.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"5 3-4","pages":"49-56"},"PeriodicalIF":0.0,"publicationDate":"1975-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12407828","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 relation of warmth and pain thresholds to skin pigmentation. 体温和疼痛阈值与皮肤色素沉着的关系。
T.-I.-T. journal of life sciences Pub Date : 1975-01-01
G M Gittinger, A M Prestrude
{"title":"The relation of warmth and pain thresholds to skin pigmentation.","authors":"G M Gittinger,&nbsp;A M Prestrude","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Thermal sensitivity increases with skin pigmentation. Absolute thresholds for warmth and pricking pain decreased as skin color increased for 13 Caucasian, 3 Mexican, and 4 Negro subjects. These data replicate and extend a previous psychophysical study of pain sensitivity and are compared with spectrophotometric data from excised skin. The results are considered to be potentially significant for the existence of a dermal light sense.</p>","PeriodicalId":76575,"journal":{"name":"T.-I.-T. journal of life sciences","volume":"5 1-2","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"1975-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12365932","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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