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International journal of chronobiology最新文献

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Rhythmic changes in pain sensitivity in teeth. 牙齿疼痛敏感性的节律性变化。
International journal of chronobiology Pub Date : 1978-01-01
L Pöllmann, P H Harris
{"title":"Rhythmic changes in pain sensitivity in teeth.","authors":"L Pöllmann,&nbsp;P H Harris","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In 136 healthy men, circadian variations in pain threshold have been observed in healthy front teeth, the pain being elicited by a cold stimulus, alterations in threshold then being inferred from changes in the minimum cold application time. The pain threshold is maximal in the early afternoon and at a minimum in the early morning. In previous experiments using an electrical current as the pain stimulus, a similar diurnal variation of sensitivity was also observed. These results conform with clinical experience of the time of onset of toothache, and are also in accord with known diurnal variations of pain sensitivity in other organs. Further studies were carried out on one subject. The minimum cold application time test was performed over more than 3 years on a healthy front tooth. The results suggest a circannual rhythm of the pain threshold, with a maximum in October/November and a minimum in May.</p>","PeriodicalId":75936,"journal":{"name":"International journal of chronobiology","volume":"5 3","pages":"459-64"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11770340","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
Ehrlich ascites carcinoma: synchronised ultradian rhythms in certain cell parameters. 埃利希腹水癌:某些细胞参数的同步超昼夜节律。
International journal of chronobiology Pub Date : 1978-01-01
L L Litinskay, G A Kostenko, A M Veksler, L K Eidus
{"title":"Ehrlich ascites carcinoma: synchronised ultradian rhythms in certain cell parameters.","authors":"L L Litinskay,&nbsp;G A Kostenko,&nbsp;A M Veksler,&nbsp;L K Eidus","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In populations of Ehrlich Ascites Carcinoma (EAC) cells rhythms of near-hourly periods have been demonstrated for several cell parameters - nucleus and cell size, permeability and strength of plasma membranes. These oscillations are characterized by a high degree of synchrony and autonomy.</p>","PeriodicalId":75936,"journal":{"name":"International journal of chronobiology","volume":"5 1","pages":"295-306"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11820290","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 photoperiod reversal on twenty-four hour patterns for GABA levels in rat brain. 光周期反转对大鼠脑24小时GABA水平的影响。
International journal of chronobiology Pub Date : 1978-01-01
A H Friedman, R W Piepho
{"title":"Effect of photoperiod reversal on twenty-four hour patterns for GABA levels in rat brain.","authors":"A H Friedman,&nbsp;R W Piepho","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>GABA levels were measured in various areas of rat brain at 3 or 6 hour intervals for a period of 24 hours in animals adapted for 3 weeks to a programmed-lighting schedule. On the normal cycle rats were illuminated from 08 to 20 hours; on the reverse cycle, from 20 to 08 hours. The cerebellar pattern is unimodal with a peak in the dark at 06 hours and a trough in the light at 18 hours which coincides with maxima and minima of motor activity in the nocturnal rat. The cortical pattern also peaks in the dark at 06 hours but is less well-defined. On the reverse illumination cycle both patterns peak significantly in the dark at 18 hours. Only the cerebellum displays significant differences when averaged GABA levels for light and dark phases are compared. A circadian pattern peaking in the dark described for GABA levels of the corpora quadrigemina which is partly-reversed by reversing the photoperiod. The rhythm in thalamus-hypothalamus which peaks in the dark is complex, consisting of an ultradian rhythm super-imposed on a circadian one. The former rhythm appears to be endogenous and unaltered by a change in the illumination cycle; the latter exogenous since it varies with the illumination cycle. Lower GABA levels in rat brain were found after photoperiod reversal.</p>","PeriodicalId":75936,"journal":{"name":"International journal of chronobiology","volume":"5 3","pages":"445-58"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11890618","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-oscillations as the most probable mode of existence of the density-controlled cell populations. 自振荡是密度控制细胞群最可能存在的模式。
International journal of chronobiology Pub Date : 1978-01-01
V G Nazarenko, E E Sel'Kov
{"title":"Self-oscillations as the most probable mode of existence of the density-controlled cell populations.","authors":"V G Nazarenko,&nbsp;E E Sel'Kov","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":75936,"journal":{"name":"International journal of chronobiology","volume":"5 1","pages":"345-67"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11820291","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
International symposium on clinical chronopharmacology, chronotherapeutics and chronopharmacy. Synoptics. 国际临床时间药理学、时间治疗学和时间药学研讨会。天气学。
International journal of chronobiology Pub Date : 1978-01-01
{"title":"International symposium on clinical chronopharmacology, chronotherapeutics and chronopharmacy. Synoptics.","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":75936,"journal":{"name":"International journal of chronobiology","volume":"5 2","pages":"395-433"},"PeriodicalIF":0.0,"publicationDate":"1978-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11860994","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 system for studying biorhythms in domestic sheep in confinement. 一种研究圈养绵羊生物节律的系统。
International journal of chronobiology Pub Date : 1977-01-01
W G Hunsaker, D J Buckley, J L Lalonde
{"title":"A system for studying biorhythms in domestic sheep in confinement.","authors":"W G Hunsaker,&nbsp;D J Buckley,&nbsp;J L Lalonde","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A system is described for studying biorhythms in domestic sheep. One animal in each of four temperature and light controlled rooms can be studied in pens designed to permit continuous monitoring of eating, drinking, walking, resting, body temperature and cardiac rate. Automated data acquisition, including analog-to-digital conversion, is controlled with a minicomputer. Digitized data are recorded on magnetic and punched paper tape. Data processing on large scale computers includes editing, summarisation, machine plotting and time-series statistical analysis of the period, amplitude and phase of the biorhythms.</p>","PeriodicalId":75936,"journal":{"name":"International journal of chronobiology","volume":"4 3","pages":"141-50"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12058717","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 chronopharmacological study on hydrochlorthiazide. 氢氯噻嗪的时间药理学研究。
International journal of chronobiology Pub Date : 1977-01-01
J N Mills, J M Waterhouse, D S Minors, Z E Dziewanowska
{"title":"A chronopharmacological study on hydrochlorthiazide.","authors":"J N Mills,&nbsp;J M Waterhouse,&nbsp;D S Minors,&nbsp;Z E Dziewanowska","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":75936,"journal":{"name":"International journal of chronobiology","volume":"4 4","pages":"267-94"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11550142","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
Circadian variation in plasma melanocyte stimulating hormone activity in the rat. 大鼠血浆黑素细胞刺激激素活性的昼夜变化。
International journal of chronobiology Pub Date : 1977-01-01
J D Dunn, A J Kastin, A J Carrillo
{"title":"Circadian variation in plasma melanocyte stimulating hormone activity in the rat.","authors":"J D Dunn,&nbsp;A J Kastin,&nbsp;A J Carrillo","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Non--stress levels of plasma melanocyte stimulating hormone (MSH) and corticosterone were determined at 3-h intervals during controlled light--dark cycles in adult, male rats. Significant 24-h periodicity was demonstrated for both plasma MSH and corticosterone. Whereas plasma MSH values were not as high during the early evening hours as during the early morning hours, plasma corticosterone levels showed a marked rise during the early afternoon and crest values occurred just before the lights off phase of the 24-h light--dark cycle. These results indicate that in the rat, the level of MSH in plasma fluctuates with a low amplitude circadian frequency which is not in phase with that observed for plasma corticosterone.</p>","PeriodicalId":75936,"journal":{"name":"International journal of chronobiology","volume":"4 3","pages":"163-9"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11410787","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
Twenty-four hour rhythms in serum and brain indoleamine concentrations: tryptophan-5-hydroxylase and monoamine oxidase activity in the rat. 大鼠血清和脑吲哚胺浓度的24小时节律:色氨酸-5-羟化酶和单胺氧化酶活性。
International journal of chronobiology Pub Date : 1977-01-01
J G Hillier, P H Redfern
{"title":"Twenty-four hour rhythms in serum and brain indoleamine concentrations: tryptophan-5-hydroxylase and monoamine oxidase activity in the rat.","authors":"J G Hillier,&nbsp;P H Redfern","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The relationship between the 24 h rhythm in 5-hydroxy-tryptamine (5HT) levels in rat brain, the availability of precursors of 5HT and the concentration of its major metabolite, 5-hydroxyindole acetic acid (5HIAA) has been investigated. Serum total and \"free\" tryptophan (TRY) levels and brain TRY levels all show a 24 h rhythm with highest concentrations in the middle of the dark phase i.e. 12 h displaced from that of the 5HT rhythm. No 24 h variation in either tryptophan-5-hydroxylase or monoamine oxidase activity was detected, nor did brain 5-hydroxytryptophan (5HTP) levels vary with clock hour. Changes in 5HIAA concentration paralleled those of 5Ht. The uptake of 14C-5HTP, 14C-TRY and 14C-5HT into homogenates of the septal region of rat brain did not display a circadian rhythm, although there was evidence that uptake of 14C-TRY in an isolated synaptosomal preparation from the same region was greater during the light phase, indicating the possibility that uptake of the precursor into the nerve ending may be, in part, responsible for the 24 h rhythm in brain 5HT. It is concluded that brain 5HT levels are independent of the serum or brain TRY concentrations measured. Since changes in 5HT with clock hour are paralleled by changes in 5HIAA, it also seems unlikely that the increase in brain 5HT during the light phase is caused by a decreased release of 5HT from nerve endings.</p>","PeriodicalId":75936,"journal":{"name":"International journal of chronobiology","volume":"4 3","pages":"197-210"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11515142","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
Stochastic principles in the temporal control of activity behaviour. 活动行为的时间控制中的随机原理。
International journal of chronobiology Pub Date : 1977-01-01
U Lehmann
{"title":"Stochastic principles in the temporal control of activity behaviour.","authors":"U Lehmann","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":75936,"journal":{"name":"International journal of chronobiology","volume":"4 4","pages":"223-66"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11794867","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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