摘要:

Limulusvisual thresholds were measured using psychophysical techniques over a period of almost one year. A pronounced seasonal trend was found; threshold varied over a range of approximately two log units and was lowest in Summer and highest in Winter. This seasonal trend had several properties:1.Thresholds measured over the whole year were not normally distributed: In Summer, thresholds clustered around one value. In Winter, thresholds clustered around another value two log units higher. And in Spring and Fall, thresholds were more widely distributed between the two values.2.Latencies were also season dependent: In both Summer and Winter, latency was a declining logarithmic function of intensity with the Summer latency versus intensity function shifted toward lower intensities. However, in Spring and Fall, the latencies declined at low intensities, then rose at intermediate intensities, and then fell again at high intensities.3.Individual animals exhibited day‐to‐day threshold alterations of a magnitude that was comparable to the seasonal variation in group thresholds.4.Temporal acuity, as measured by the temporal summation function, was unaffected by the seasonal and daily threshold variation.

ISSN:0022-1945    

DOI:10.1080/09291018309359812

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The circadian, weekly and annual rhythm of pain sensation in syndromes of the lumbar area is studied and the effect of exogenous factors shown. The following numerical results were obtained:1.An undisturbed circadian cycle of pain sensation exists over weekends when the patients get no medical treatment.2.Women have a lower pain sensation than men.3.The pain sensation is correlated to the seasons, depending on sex.

ISSN:0022-1945    

DOI:10.1080/09291018309359813

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Cycle Regression Analysis, a new cycle extraction procedure based on nonlinear regression techniques is presented. A comparison of the results in predicting civil violence is made between this new procedure and Alcock and Quittner's step‐wise multiple linear regression technique.

ISSN:0022-1945    

DOI:10.1080/09291018309359814

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The circadian rhythm of activity of the enzyme glyceraldehyde‐3‐phosphate dehydrogenase (GAPD) in E.L.4 ascites cells varies accordingtothe genotype of the host mouse in which the cells are grown. This is not the case for the circadian rhythm of adenosine deaminase (ADA), which is the same in all hosts, at least within the range of genotypes studied. The relationship between host genotype and the rhythm of GAPD and ADA activity is the same as that between genotype and the rhythms of these enzymes in normal thymus cells. Taken together the data suggest that in E.L.4 cells the rhythm of GAPD activity, but not ADA activity, is influenced by a factor which is not intrinsic to the E.L.4 cells, and that the same factor may influenceGAPD, but not ADA, rhythm within the thymus.

ISSN:0022-1945    

DOI:10.1080/09291018309359815

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The gonadotrophic potency in pituitary and serum of both sexes ofC. batrachuswas evaluated by measuring stimulated ovarian32P uptake in hypophysectomizedH. fossilisin response to the injections of pituitary extract and serum ofC. batrachus.Gonadal activity was assessed by GSI, gonadal32P uptake and gonadal lipid and cholesterol levels. Pituitary and serum gonadotrophic potency inC. batrachusincreased along with GSI, gonadal32P uptake and gonadal lipid and cholesterol contents during the breeding season. The above period was marked with increasing photoperiod and temperature. Concentrations of lipid and cholesterol in the ovary also exhibited the similar pattern, but testicular lipid and cholesterol concentrations were low during the above period. These parameters showed the reverse trend during the non‐breeding season, when the photoperiod was short and temperature was low.

ISSN:0022-1945    

DOI:10.1080/09291018309359816

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0022-1945    

DOI:10.1080/09291018309359811

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor