12 resultados para Circadian clock

em Brock University, Canada


Relevância:

20.00% 20.00%

Publicador:

Resumo:

Message to the Senate and House of Representatives of the United States / James Madison -- Report : the Committee on Foreign relations, to whom was referred the message of the President of the United States of the 1st of June, 1812 -- An Act, declaring war between the United Kingdom of Great Britain and Ireland and the dependencies thereof, and the United States of America and their territories -- Address of the Senate to the people of the Commonwealth of Massachusetts.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Message to the Senate and House of Representatives of the United States / James Madison -- Report : the Committee on Foreign relations, to whom was referred the message of the President of the United States of the 1st of June, 1812 -- An Act, declaring war between the United Kingdom of Great Britain and Ireland and the dependencies thereof, and the United States of America and their territories -- Address of the Senate to the people of the Commonwealth of Massachusetts.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Receipt from Burrill, McEwen and Co. for Chinese clock, Oct. 12, 1876.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Four groups of rainbow trout, Salmo gairdneri, were acclimated to 2°, 10°, and 18°e, and to a diurnal temperature cycle (100 ± 4°C). To evaluate the influence of cycling temperatures in terms of an immediate as opposed to acclimatory response various ventilatory-cardiovascular rate functions were observed for trout, either acclimated to cycling temperatures or acclimated to constant temperatures and exposed to a diurnal temperature cycle for the first time (10° ± 4°C for trout acclimated to 10°C; 18°+ 4°C for trout acclimated to l8°e). Gill resistance and the cardiac to ventilatory rate ratio were then calculated. Following a post preparatory recovery period of 36 hr, measurements were made over a 48 hour period with the first 24 hours being at constant temperature in the case of statically-acclimated fish followed by 24 hours under cyclic temperature conditions. Trout exhibited marked changes in oxygen consumption (Vo ) with temp- 2 erature both between acclimation groups, and in response to the diurnal temperature cycle. This increase in oxygen uptake appears to have been achieved by adjustment of ventilatory and, to some extent, cardiovascular activity. Trout exhibited significant changes in ventilatory rate (VR), stroke volume (Vsv), and flow (VG) in response to temperature. Marked changes in cardiac rate were also observed. These findings are discussed in relation to their importance in convective oxygen transport via water and blood at the gills and tissues. Trout also exhibited marked changes in pressure waveforms associated with the action of the resp; ratory pumps with temperature. Mean differenti a 1 pressure increased with temperature as did gill resistance and utilization. This data is discussed in relation to its importance in diffusive oxygen transport and the conditions for gas exchange at the gills. With one exception, rainbow trout were able to respond to changes in oxygen demand and availability associated with changes in temperature by means of adjustments in ventilation, and possibly pafusion, and the conditions for gas exchange at the gills. Trout acclimated to 18°C, however, and exposed to high cyclic temperatures, showed signs of the ventilatory and cardiovascular distress problems commonly associated with low circulating levels of oxygen in the blood. It appears these trout were unable to fully meet the oxygen requirements associated with c~ling temperatures above 18°C. These findings were discussed in relation to possible limitations in the cardiovascular-ventilatory response at high temperatures. The response of trout acclimated to cycling temperatures was generally similar to that for trout acclimated to constant temperatures and exposed to cycling temperatures for the first time. This result suggested that both groups of fish may have been acclimated to a similar thermal range, regardless of the acclimation regime employed. Such a phenomenon would allow trout of either acclimation group to respond equally well to the imposed temperature cycle. Rainbow trout showed no evidence of significant diurnal rhythm in any parameters observed at constant temperatures (2°, 10°, and 18° C), and under a 12/12 light-dark photoperiod regime. This was not taken to indicate an absence of circadian rhythms in these trout, but rather a deficiency in the recording methods used in the study.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Several recent studies have described the period of impaired alertness and performance known as sleep inertia that occurs upon awakening from a full night of sleep. They report that sleep inertia dissipates in a saturating exponential manner, the exact time course being task dependent, but generally persisting for one to two hours. A number of factors, including sleep architecture, sleep depth and circadian variables are also thought to affect the duration and intensity. The present study sought to replicate their findings for subjective alertness and reaction time and also to examine electrophysiological changes through the use of event-related potentials (ERPs). Secondly, several sleep parameters were examined for potential effects on the initial intensity of sleep inertia. Ten participants spent two consecutive nights and subsequent mornings in the sleep lab. Sleep architecture was recorded for a fiiU nocturnal episode of sleep based on participants' habitual sleep patterns. Subjective alertness and performance was measured for a 90-minute period after awakening. Alertness was measured every five minutes using the Stanford Sleepiness Scale (SSS) and a visual analogue scale (VAS) of sleepiness. An auditory tone also served as the target stimulus for an oddball task designed to examine the NlOO and P300 components ofthe ERP waveform. The five-minute oddball task was presented at 15-minute intervals over the initial 90-minutes after awakening to obtain six measures of average RT and amplitude and latency for NlOO and P300. Standard polysomnographic recording were used to obtain digital EEG and describe the night of sleep. Power spectral analyses (FFT) were used to calculate slow wave activity (SWA) as a measure of sleep depth for the whole night, 90-minutes before awakening and five minutes before awakening.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

A receipt from W.W. Tyrrill, of St. Catharines, Ontario dated June 2, 1888, for a ladies Swiss watch priced at $11.00. The receipt is a rental agreement which specifies the terms of a fee payment schedule. Information on the receipt indicates Mr. Tyrrill sold watches, jewelry, silver plated goods, albums and Bibles. He is also listed as an agent for pianos, organs and Singer sewing machines. This receipt was in the possession of Iris Sloman Bell, of St. Catharines. Relatives of the Sloman Bell families include former Black slaves from the United States who settled in southern Ontario.There are various spellings of the Tyrrill name within the Bell family archive. Other forms of the name include Tyrell, Tyrrell, and Terrell.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

6 of the postcards are sketches by Norbert Collins, these include: St. George’s Anglican Church, the museum, St. Paul United Church, Ridley College clock tower, St. Catherine’s Cathedral and the Willam Hamilton Merritt monument (all of St. Catharines). The 7th postcard is a picture of the St. Catharines Craft Guild Shop in Port Dalhousie (artist unknown). Norbert J. Collins is a Canadian artist.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

An invitation to the funeral of Mrs. John W. Ball. The invitation reads: Niagara, February 5th, 1856. Sir--- You are requested to attend the Funeral of the late Mrs. John W. Ball, from the Residence of her husband to the Place of Internment, on Thursday the 7th Instant, at the hour of Two O'Clock in the afternoon.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Eleanore Celeste describes her previous day: Studies, shopping for Mother, bridge party, out with girls and Uncle Dick. They attended the play "pearls" starring Robert Edison. The rest of the letter is written on New Year's Eve at twelve o'clock. She recounts last New Year's Eve.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

The letter reads:" Dearest, How do you like this little surprise party? It is the latest way of sewing for the Red Cross - You remember I told you I was to meet Maud at two o'clock this afternoon, and we were going down to make surgical dressings? Well, thru a little misunderstanding about our meeting place, we missed each other; so I returned home. Mother thought I looked tired and insisted upon my taking a nap. I cam up to my room, and for an hour I've been trying to sleep, but "thought"(???) has prevented it. Artie dear, I have such an awful attack of the blues and while I was lying there trying to fight it, and also wishing that I knew your address - for I felt so much like writing to you, the thought came to me, that I could send a letter to you thru Chaunce, if I knew his company number. Hence - ensued a little chat with Mrs. Leake on the phone, and receiving the desired information, rushed to my desk, and - thus endeth the little tale. You are just about reaching Washington now, and I bet you are tired after that dreadfully monotonous trip. Take good care of yourself my "___"(?) Good luck, and lots of other wishes. Lovingly "Me". P.S. Write real, real soon and thank Chaunce for playing postman. L.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

An invitation to an "Afternoon Presentation Party in the Garden of Buckingham Palace on Thursday 28th May 1953 from 4 to 6 o'clock". The invitation is to Mr. and Mrs. Arthur Schmon and lists dress attire for ladies and gentlemen.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

A handout that reads: "Indignation Meeting. A Meeting will be held in the Orange Hall tomorrow evening Tuesday, July 17th at 8 o'clock, p.m. To protest against the late mean and despicable action taken by the Police in subpoenaing respectable and worthy Citizens to give evidence as whiskey-sneaks, thus interfering with the liberty of free-born subjects, and as likely to intimidate good citizens from entering an hotel. Everyone should attend and protest against such a resurrected tombstone ironheeled law, to bear which is to suffer worse than the slaves in Siberia. Arouse ye all!" Moosomin, Saskatchewan, 16 July 1888.