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Chronobiologia最新文献

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Circadian variation of the frequency of sudden infant death syndrome and of sudden death from life-threatening conditions in infants. 婴儿猝死综合征和婴儿因危及生命的疾病猝死频率的昼夜变化。
Chronobiologia Pub Date : 1991-10-01
I A Kelmanson
{"title":"Circadian variation of the frequency of sudden infant death syndrome and of sudden death from life-threatening conditions in infants.","authors":"I A Kelmanson","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>136 infants died of sudden infant death syndrome (SIDS) and 140 infants died suddenly and unexpectedly from life-threatening conditions (LTC) from 1983 to 1989 in Leningrad entered the study. 24-hour distribution of death cases was evaluated in both studied groups. The increased incidence of SIDS was revealed from 04(00) to 06(00). There was not significant difference between circadian variation of SIDS and that of death from LTC. The early morning seems to be the time when the risk factors that lead to sudden death are likely to be prominent.</p>","PeriodicalId":75705,"journal":{"name":"Chronobiologia","volume":"18 4","pages":"181-6"},"PeriodicalIF":0.0,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12978544","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
Chronobiology meets the need for integration in a reductionist climate of biology and medicine. 时间生物学在生物学和医学的还原主义氛围中满足了整合的需要。
Chronobiologia Pub Date : 1991-04-01
F Halberg, G Cornélissen, F Carandente
{"title":"Chronobiology meets the need for integration in a reductionist climate of biology and medicine.","authors":"F Halberg,&nbsp;G Cornélissen,&nbsp;F Carandente","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>One of us introduces a chronobiology course to students at the University of Milan, Italy, with a succinct statement that may well serve to summarize the foregoing 24 points. Its few lines distill the preceding details and formulate the raison d'être of Chronobiology: Chronobiology is: not only a science in its own right; not only a methodology; not only a new kind of statistical analysis; not just an aspect of biology, but a new way of invariably approaching any problem in biology, notably medicine.</p>","PeriodicalId":75705,"journal":{"name":"Chronobiologia","volume":"18 2-3","pages":"93-103"},"PeriodicalIF":0.0,"publicationDate":"1991-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12923000","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 chronobiological approach to the effects of cefodizime on monocytic and granulocytic functions of patients with multiple myeloma. 头孢地嗪对多发性骨髓瘤患者单核细胞和粒细胞功能影响的时间生物学研究。
Chronobiologia Pub Date : 1991-04-01
F Carandente, F Dammacco, V Balsamo
{"title":"A chronobiological approach to the effects of cefodizime on monocytic and granulocytic functions of patients with multiple myeloma.","authors":"F Carandente,&nbsp;F Dammacco,&nbsp;V Balsamo","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":75705,"journal":{"name":"Chronobiologia","volume":"18 2-3","pages":"89-92"},"PeriodicalIF":0.0,"publicationDate":"1991-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12922997","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
Hufeland's interest in plant movements. Hufeland对植物运动的兴趣。
Chronobiologia Pub Date : 1991-04-01
J Aschoff
{"title":"Hufeland's interest in plant movements.","authors":"J Aschoff","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Christoph Wilhelm Hufeland (1762-1836) was one of the eminent physicians at the time of Goethe. When only 21 years old, he followed his father as a medical practitioner in Weimar. In 1793 he became Professor of Medicine at the University of Jena, from where he moved, in 1801, to Berlin as the physician in ordinary to king Friedrich Wilhelm III, council of state, and Professor at the leading hospital, the Charité. Hufeland pioneered in what today would be called public hygiene. Many of his lectures and publications were addressed to the educated laymen. In his most read book, the 'Makrobiotik', he emphasizes the importance of the 24-h periodicity as a basic unit of biological chronometry. In view of this, Hufeland has become a kind of 'patron saint' to modern chronobiologists.</p>","PeriodicalId":75705,"journal":{"name":"Chronobiologia","volume":"18 2-3","pages":"75-8"},"PeriodicalIF":0.0,"publicationDate":"1991-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12924452","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 mathematical model for time perception with experimentally obtained subjective time scales for humans and rats. 用实验获得的人类和大鼠主观时间尺度建立时间感知的数学模型。
Chronobiologia Pub Date : 1991-04-01
H Eisler, A D Eisler
{"title":"A mathematical model for time perception with experimentally obtained subjective time scales for humans and rats.","authors":"H Eisler,&nbsp;A D Eisler","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The concept of sensation measurement with the entailing subjective scales is explained. It is shown that linearity between, e.g. sensation halving values and standard values implies that subjective sensation (output) grows as a power function of the physical measure of the stimulus (input). This outcome can be used in the scaling of subjective duration, based on reproduction experiments, i.e., experiments in which the participants are required to reproduce given time intervals, e.g., indicated by noise. It will be shown that what is reproduction for the participant is halving for the experimenter, making it possible to determine the parameters of the power function. The model is confirmed experimentally for humans and rats, the rats having a lower exponent than adults. In a recent experiment it was shown that the reproduced durations differ between female and male observers as well as for different sound intensities. These differences could be attributed to differences in parameter values. An interesting observation is that almost all power functions exhibit a discontinuity, possibly indicating a switch between different neural loops as the durations become longer.</p>","PeriodicalId":75705,"journal":{"name":"Chronobiologia","volume":"18 2-3","pages":"79-88"},"PeriodicalIF":0.0,"publicationDate":"1991-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12924455","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
Vasopressin: its possible role in circadian time keeping. 抗利尿激素:其在昼夜节律保持中的可能作用。
Chronobiologia Pub Date : 1991-01-01
V Reghunandanan, R Reghunandanan, R K Marya
{"title":"Vasopressin: its possible role in circadian time keeping.","authors":"V Reghunandanan,&nbsp;R Reghunandanan,&nbsp;R K Marya","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In this review article an insight has been made into the strong possibility of the role of vasopressin (VP) in the control of circadian rhythms which has emerged from the results of the recent experiments in this field. A role for VP, which is identified in the suprachiasmatic nuclei (SCN) of mammals, as a neurotransmitter/neuromodulator in the central nervous system has been postulated for some time now. The presence of certain abnormalities in the circadian rhythms in VP deficient Brattleboro rats has suggested that this neuropeptide is a likely candidate in controlling circadian rhythms. The coexistence of VP and corticotropin releasing factor (CRF), their interrelation with reference to their role in the hypothalamus-pituitary-adrenocortical glucocorticoid axis not only in states of stress but also in day-to-day life has also been discussed. The possible role of dynorphin, which is co-synthesized with VP in the hypothalamic neurons, and other opioids in the control of circadian rhythms has been highlighted. The pineal, SCN relation in the process of development of circadian rhythms has also been reviewed briefly.</p>","PeriodicalId":75705,"journal":{"name":"Chronobiologia","volume":"18 1","pages":"39-47"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12823362","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 chronobiology of epilepsy: murine models of seizure susceptibility and theoretical perspectives for neurology. 癫痫的昼夜节律生物学:癫痫易感性的小鼠模型和神经病学的理论观点。
Chronobiologia Pub Date : 1991-01-01
C Poirel
{"title":"Circadian chronobiology of epilepsy: murine models of seizure susceptibility and theoretical perspectives for neurology.","authors":"C Poirel","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>As an integrative discipline in physiology and medical research, chronobiology renders possible the discovery of new regulation processes regarding the central mechanisms of epilepsy. In this context, the temporal fluctuations of seizure susceptibility rhythmometrically detected tend to demonstrate 1. that tonic-clonic events are circadian stage-dependent processes whose temporal characteristics (i.e. MESOR, amplitude, acrophase) and clinical parameters (e.g. neurological components, severity of motor discharges) are predictable on the basis of mathematical models, and 2. that the generalized epileptic onsets may respond to telencephalic integrations modulated by centrencephalic circadian processes of vigilance. Considering the data model assumed for our rhythmometric analyses, the circadian psychophysiological patterns of epilepsy also express dynamic biologic systems which reveal some intermodulating endogenous processes between vigilance and seizure susceptibility. The new chronophysiology investigations considered at a rhythmometric level of resolution suggest several heuristic perspectives regarding 1. the central pathophysiology of epilepsy and 2. the behavioral classification of convulsive events. Such circadian studies also show that chronobiology raises some working hypotheses in psychophysiology and permits the development of new theoretical concepts in the field of neurological science.</p>","PeriodicalId":75705,"journal":{"name":"Chronobiologia","volume":"18 1","pages":"49-69"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13093868","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
Timing of parturition in the rat: an analysis of successive births. 大鼠的分娩时间:连续分娩的分析。
Chronobiologia Pub Date : 1991-01-01
D L Rowland, A L Wagonblast, T A Dykstra
{"title":"Timing of parturition in the rat: an analysis of successive births.","authors":"D L Rowland,&nbsp;A L Wagonblast,&nbsp;T A Dykstra","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>To determine whether consecutive parturitions within individual rats are likely to occur around the same time of the 24h day, female rats mated prior to ovulation and maintained on a LD 12:12 photoperiod, were observed over either two or three parturitions. A subgroup of females was placed on constant light during the second gestation in order to determine the role of photoperiod in the temporal synchronization of consecutive births. The major findings were 1. individual females tended to give birth around the same time of the day on consecutive births so long as the photoperiod remained constant; 2. the small percentage of births occurring during darkness, the less-prevalent time of the photoperiod for birthing, were anomalous births for individual females; and 3. litter weight was a significant factor in predicting time of birth for females, but this effect interacted with photoperiod. These data elucidate the importance of knowing previous birth time, litter weight, and photoperiod on predicting the time of parturition in the rat.</p>","PeriodicalId":75705,"journal":{"name":"Chronobiologia","volume":"18 1","pages":"31-8"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13093866","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
Patterns of daily allocation of sleep periods: a case study in an Amazonian riverine community. 每日睡眠时间分配模式:一个亚马逊河流域社区的案例研究。
Chronobiologia Pub Date : 1991-01-01
G F Aguiar, H P da Silva, N Marques
{"title":"Patterns of daily allocation of sleep periods: a case study in an Amazonian riverine community.","authors":"G F Aguiar,&nbsp;H P da Silva,&nbsp;N Marques","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Few works already carried out have examined the relative role of genetic and external factors on the determination of the rhythmicity of the human sleep/wake cycle. In order to make a preliminary approach in this field, we investigated the diversity of patterns of allocation of sleep periods among 29 families living at the Combu Island, a socioculturally very homogeneous human group of the Brazilian Amazon. The individuals were interviewed through a questionnaire designed by Horne and Ostberg (1976), with the language of the questions adjusted to the way-of-life of the riverine people. A large predominance of the morning type was observed (95.35%), what constitutes a strong deviation in relation to other populations studied, suggesting the occurrence of a masking effect. The individual scores presented a positive correlation with the age (r = 0.31; p less than 0.01), and a significant intersexual difference was also verified (t = 3.08; p less than 0.01). This intersex difference is explained, in part, by analyzing the socioeconomic patterns of the community. The offspring/parent regression of the individual scores indicated a low dependency between genitors and their direct descendents (p greater than 0.7), and the estimative of heritability obtained (0.14) is artificial, since the offspring/mother and offspring/midparent regression coefficients were negative. Statistically non-significant coefficients of correlation and/or regression showed a highly randomic populational distribution of scores for the Horne-Ostberg's test. Such findings suggest that the intensity of the masking over the sleep/wake cycle varies among human populations, and that the individual tendency towards morningness/eveningness is strongly related to sociocultural factors.</p>","PeriodicalId":75705,"journal":{"name":"Chronobiologia","volume":"18 1","pages":"9-19"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13093869","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
Sunspots and hip fractures. 太阳黑子和髋部骨折。
Chronobiologia Pub Date : 1991-01-01
M Caniggia, C Scala
{"title":"Sunspots and hip fractures.","authors":"M Caniggia,&nbsp;C Scala","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In this paper a remarkable statistical link between sunspot cycles and prevalence of hip fractures in the elderly is shown. Hip fractures in old people are due to: 1. increased bone fragility for metabolic bone disease; 2. increased propension to fall. Though it is obvious that a correlation does not imply any causal relationship, reasonable conjectures can be allowed. The hypothesis of an 11-year cyclic variation of ultraviolet radiation as a cause of hip fractures is untenable; one may better assume that solar flares can negatively influence the nervous postural regulation leading to a greater propensity to accidental falls.</p>","PeriodicalId":75705,"journal":{"name":"Chronobiologia","volume":"18 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13093863","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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