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Journal articles on the topic 'Timekeeping'

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Published: 4 June 2021
Last updated: 3 March 2023

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1

Bartky, Lan R. "Timekeeping." Science 239, no. 4839 (January 29, 1988): 450. http://dx.doi.org/10.1126/science.239.4839.450.b.

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2

BARTKY, LAN R. "Timekeeping." Science 239, no. 4839 (January 29, 1988): 450.2–450. http://dx.doi.org/10.1126/science.239.4839.450.

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3

Gillette, Martha U., and Sabra M. Abbott. "Biological Timekeeping." Sleep Medicine Clinics 4, no. 2 (June 2009): 99–110. http://dx.doi.org/10.1016/j.jsmc.2009.01.005.

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4

Gillette, Martha U., Sabra M. Abbott, and Jennifer M. Arnold. "Biological Timekeeping." Sleep Medicine Clinics 7, no. 3 (September 2012): 427–42. http://dx.doi.org/10.1016/j.jsmc.2012.06.001.

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5

Giebultowicz, J. "Chronobiology: Biological Timekeeping." Integrative and Comparative Biology 44, no. 3 (June 1, 2004): 266. http://dx.doi.org/10.1093/icb/44.3.266.

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6

Morrison, Philip. "The Timekeeping ELF." Scientific American 278, no. 4 (April 1998): 105–7. http://dx.doi.org/10.1038/scientificamerican0498-105.

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7

Foulkes, Nick. "Timekeeping in worms." Trends in Genetics 16, no. 4 (April 2000): 159. http://dx.doi.org/10.1016/s0168-9525(00)01975-2.

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8

KARATSOREOS, I., and R. SILVER. "Chronobiology: biological timekeeping." Physiology & Behavior 82, no. 5 (October 15, 2004): 927–29. http://dx.doi.org/10.1016/s0031-9384(04)00288-4.

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9

Bechtold, David A. "Energy-responsive timekeeping." Journal of Genetics 87, no. 5 (December 2008): 447–58. http://dx.doi.org/10.1007/s12041-008-0067-6.

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10

Wu, Carole-Jean, and Margaret Martonosi. "Adaptive timekeeping replacement." ACM Transactions on Architecture and Code Optimization 8, no. 1 (April 2011): 1–26. http://dx.doi.org/10.1145/1952998.1953001.

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11

Benirschke, K. "Chronobiology: Biological Timekeeping." Journal of Heredity 95, no. 1 (January 1, 2004): 91–92. http://dx.doi.org/10.1093/jhered/esh004.

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12

Varnava, Christiana. "Timekeeping in microgravity." Nature Electronics 2, no. 1 (January 2019): 12. http://dx.doi.org/10.1038/s41928-018-0202-1.

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13

Grisham, Julie. "The Genetics of Timekeeping." BioScience 45, no. 1 (January 1995): 7–9. http://dx.doi.org/10.2307/1312528.

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14

Andrewes, William J. H. "A Chronicle Of Timekeeping." Scientific American sp 16, no. 1 (February 2006): 46–55. http://dx.doi.org/10.1038/scientificamerican0206-46sp.

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15

Andrewes, William J. H. "A Chronicle of Timekeeping." Scientific American 287, no. 3 (September 2002): 76–85. http://dx.doi.org/10.1038/scientificamerican0902-76.

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16

Lippincott, Kristen. "Tripped up by timekeeping." Nature 394, no. 6688 (July 1998): 32–33. http://dx.doi.org/10.1038/27822.

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17

Derevianko, Andrei. "Accurate and stable timekeeping." Nature Reviews Physics 1, no. 8 (July 29, 2019): 478–79. http://dx.doi.org/10.1038/s42254-019-0089-4.

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18

Andrewes, William J. H. "A Chronicle of Timekeeping." Scientific American: A Matter of Time 23, no. 4s (October 23, 2014): 50–57. http://dx.doi.org/10.1038/scientificamericantime1114-50.

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19

Elsdale, T., and D. Davidson. "Timekeeping by frog embryos, in normal development and after heat shock." Development 99, no. 1 (January 1, 1987): 41–49. http://dx.doi.org/10.1242/dev.99.1.41.

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(1) Timekeeping refers to the uniformity of development in time. The precision of timekeeping is measured by the extent to which embryos, within an initially synchronous population, come to diverge in the course of their development. (2) Divergence is measured as the variation in the stage of development reached between embryos allowed to develop for a fixed period of time. The lower the variation the better the timekeeping. (3) Divergence among frog embryos that started development at the same time is hardly measurable after approx. 100 h of development. This striking uniformity indicates good timekeeping. (4) Timekeeping is not impaired among the survivors following heat shocks that retard development and disturb and curtail morphogenesis. (5) The immediate effect of heat shock is a stoppage of development, the duration of which is the same for all embryos in the same treatment batch. The embryos react to heat shock by rescheduling their development with the interpolation of a rest, the duration of which is controlled to the same precision as normal development. The postponement of development, without impairment of timekeeping, implies dis-engagement of the processes of morphogenesis from, and their subsequent re-engagement with, an enduring rate-determining activity unaffected by heat shock. (6) We have searched for embryos whose rate of development was disturbed by heat shock to run slower or faster than the norm. We have found none. It seems that the (temperature-compensated) rate of development is invariant up to the moment of failure, or a change is immediately lethal.
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20

Pendergast, Julie S., and Shin Yamazaki. "The Mysterious Food-Entrainable Oscillator: Insights from Mutant and Engineered Mouse Models." Journal of Biological Rhythms 33, no. 5 (July 23, 2018): 458–74. http://dx.doi.org/10.1177/0748730418789043.

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The food-entrainable oscillator (FEO) is a mysterious circadian clock because its anatomical location(s) and molecular timekeeping mechanism are unknown. Food anticipatory activity (FAA), which is defined as the output of the FEO, emerges during temporally restricted feeding. FAA disappears immediately during ad libitum feeding and reappears during subsequent fasting. A free-running FAA rhythm has been observed only in rare circumstances when food was provided with a period outside the range of entrainment. Therefore, it is difficult to study the circadian properties of the FEO. Numerous studies have attempted to identify the critical molecular components of the FEO using mutant and genetically engineered mouse models. Herein we critically review the experimental protocols and findings of these studies in mouse models. Several themes emerge from these studies. First, there is little consistency in restricted feeding protocols between studies. Moreover, the protocols were sometimes not optimal, resulting in erroneous conclusions that FAA was absent in some mouse models. Second, circadian genes are not necessary for FEO timekeeping. Thus, another noncanonical timekeeping mechanism must exist in the FEO. Third, studies of mouse models have shown that signaling pathways involved in circadian timekeeping, reward (dopaminergic), and feeding and energy homeostasis can modulate, but are not necessary for, the expression of FAA. In sum, the approaches to date have been largely unsuccessful in discovering the timekeeping mechanism of the FEO. Moving forward, we propose the use of standardized and optimized experimental protocols that focus on identifying genes that alter the period of FAA in mutant and engineered mouse models. This approach is likely to permit discovery of molecular components of the FEO timekeeping mechanism.
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21

Sun, Leyuan, Wende Huang, Shuaihe Gao, Wei Li, Xiye Guo, and Jun Yang. "Joint Timekeeping of Navigation Satellite Constellation with Inter-Satellite Links." Sensors 20, no. 3 (January 25, 2020): 670. http://dx.doi.org/10.3390/s20030670.

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As a system of ranging and positioning based on time transfer, the timekeeping ability of a navigation satellite constellation is a key factor for accurate positioning and timing services. As the timekeeping performances depend on the frequency stability and predictability of satellite clocks, we propose a method to establish a more stable and predictable space time reference, i.e., inter-satellite link time (ISLT), uniting the satellite clocks through inter-satellite links (ISLs). The joint timekeeping framework is introduced first. Based on the weighted average timescale algorithm, the optimal weights that minimize the increment of the ISLT timescale are determined and allocated to the clock ensemble to improve the frequency stability and predictability in both the long and short term. The time deviations with respect to the system time of nine BeiDou-3 satellites through multi-satellite precise orbit determination (MPOD) are used for joint timekeeping evaluation. According to the Allan deviation, the frequency of the ISLT is more stable than the nine satellite clocks in the short term (averaging time smaller than 7000 s), and its daily stability can reach 6 × 10−15. Meanwhile, the short-term (two hours) and long-term (10 h) prediction accuracy of the ISLT is 0.18 and 1.05 ns, respectively, also better than each satellite clock. Furthermore, the joint timekeeping is verified to be robust against single-satellite malfunction.
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22

Dong, Shao Wu. "About Timekeeping Activities at NTSC." Applied Mechanics and Materials 475-476 (December 2013): 330–33. http://dx.doi.org/10.4028/www.scientific.net/amm.475-476.330.

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The National Time Service Center, Chinese Academy of Sciences (CAS) has taken the charge of the national standard time and frequency service since early 1970s. The China National Standard Time, UTC(NTSC), is generated and kept at the Timekeeping Laboratory of NTSC. The research activities and the facilities of the lab are described in this paper. The accuracy of UTC-UTC(NTSC) and stability of independent local time scale TAI-TA(NTSC) realized are shown in this paper.
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23

Lombardi, Michael A. "A Brief History of Timekeeping." American Journal of Physics 90, no. 7 (July 2022): 549. http://dx.doi.org/10.1119/5.0096793.

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24

Withington, Frances Neville. "Role of Telecommunications in Timekeeping." Journal of Surveying Engineering 111, no. 1 (March 1985): 36–42. http://dx.doi.org/10.1061/(asce)0733-9453(1985)111:1(36).

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25

Englund, R. K. "Administrative Timekeeping in Ancient Mesopotamia." Journal of the Economic and Social History of the Orient 31, no. 2 (1988): 121–85. http://dx.doi.org/10.1163/156852088x00070.

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26

Milev, Nikolay B., Sue-Goo Rhee, and Akhilesh B. Reddy. "Cellular Timekeeping: It’s Redox o’Clock." Cold Spring Harbor Perspectives in Biology 10, no. 5 (August 4, 2017): a027698. http://dx.doi.org/10.1101/cshperspect.a027698.

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27

Kyriacou, C. P. "PHYSIOLOGY: Tales of Organic Timekeeping." Science 297, no. 5582 (August 2, 2002): 774–75. http://dx.doi.org/10.1126/science.1072295.

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28

Margolis, Helen. "A brief history of timekeeping." Physics World 31, no. 11 (November 2018): 27–30. http://dx.doi.org/10.1088/2058-7058/31/11/36.

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29

Cupcea, George. "TIMEKEEPING IN THE ROMAN ARMY." Classical Quarterly 67, no. 2 (October 9, 2017): 597–606. http://dx.doi.org/10.1017/s0009838817000568.

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The structure and organization of the Roman army is a complex subject for ancient historians. Of its multiple aspects, the schedule of the daily routine is one of the most interesting but, at the same time, is scarcely known. Of course, huge progress has been made with the publication of the daily rosters of one particular auxiliary unit in the East (cohors XX Palmyrenorum, at Dura, Syria), but the detail of the chronological organization of the unit's schedule is still to be revealed.
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30

Gingrich, Andre, Elinor Ochs, and Alan Swedlund. "Repertoires of Timekeeping in Anthropology." Current Anthropology 43, S4 (August 2002): S3—S4. http://dx.doi.org/10.1086/339564.

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31

Van Cauter, Eve, and Fred W. Turek. "Depression: A Disorder of Timekeeping?" Perspectives in Biology and Medicine 29, no. 4 (1986): 510–20. http://dx.doi.org/10.1353/pbm.1986.0033.

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32

Hu, Zhigang, Stefanos Kaxiras, and Margaret Martonosi. "Timekeeping in the memory system." ACM SIGARCH Computer Architecture News 30, no. 2 (May 2002): 209–20. http://dx.doi.org/10.1145/545214.545239.

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33

Schwartz, William J., Matthew T. Morton, Roger S. Williams, Lawrence Tamarkin, Theodore L. Baker, and William C. Dement. "Circadian Timekeeping in Narcoleptic Dogs." Sleep 9, no. 1 (March 1986): 120–25. http://dx.doi.org/10.1093/sleep/9.1.120.

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34

Kloeden, P. E., R. Rössler, and O. E. Rössler. "Timekeeping in genetically programmed aging." Experimental Gerontology 28, no. 2 (March 1993): 109–18. http://dx.doi.org/10.1016/0531-5565(93)90001-t.

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35

Mosier, Alexander E., and Jennifer M. Hurley. "Circadian Interactomics: How Research Into Protein-Protein Interactions Beyond the Core Clock Has Influenced the Model of Circadian Timekeeping." Journal of Biological Rhythms 36, no. 4 (May 31, 2021): 315–28. http://dx.doi.org/10.1177/07487304211014622.

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The circadian clock is the broadly conserved, protein-based, timekeeping mechanism that synchronizes biology to the Earth’s 24-h light-dark cycle. Studies of the mechanisms of circadian timekeeping have placed great focus on the role that individual protein-protein interactions play in the creation of the timekeeping loop. However, research has shown that clock proteins most commonly act as part of large macromolecular protein complexes to facilitate circadian control over physiology. The formation of these complexes has led to the large-scale study of the proteins that comprise these complexes, termed here “circadian interactomics.” Circadian interactomic studies of the macromolecular protein complexes that comprise the circadian clock have uncovered many basic principles of circadian timekeeping as well as mechanisms of circadian control over cellular physiology. In this review, we examine the wealth of knowledge accumulated using circadian interactomics approaches to investigate the macromolecular complexes of the core circadian clock, including insights into the core mechanisms that impart circadian timing and the clock’s regulation of many physiological processes. We examine data acquired from the investigation of the macromolecular complexes centered on both the activating and repressing arm of the circadian clock and from many circadian model organisms.
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36

Birth, Kevin. "King Alfred’s Candles and Anglo-Saxon Time-reckoning." KronoScope 18, no. 2 (September 18, 2018): 117–37. http://dx.doi.org/10.1163/15685241-12341412.

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AbstractBishop Asser’s biography of King Alfred describes him as creating a candle “clock” to know the time on cloudy days and at night. This candle “clock” has often been seen as an early example of uniform timekeeping and equinoctial hours, and consequently in conflict with the seasonally variable canonical hours. The approach taken here challenges this interpretation. It views King Alfred’s candles as complementary to rather than in conflict with sidereal timekeeping, clepsydrae, cockcrow, and canonical hours. This leads to an interpretation of the candles as a means of interweaving of liturgical and secular timekeeping. It is argued, moreover, that pluralism in ways of reckoning time is a feature of Anglo-Saxon time consciousness; Alfred should not be viewed as an horological innovator, but as a monarch whose interests in time reflect those of his society.
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37

O'Neill, John S., and Akhilesh B. Reddy. "The essential role of cAMP/Ca2+ signalling in mammalian circadian timekeeping." Biochemical Society Transactions 40, no. 1 (January 19, 2012): 44–50. http://dx.doi.org/10.1042/bst20110691.

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Approximately daily, or circadian, rhythms are ubiquitous across eukaryotes. They are manifest in the temporal co-ordination of metabolism, physiology and behaviour, thereby allowing organisms to anticipate and synchronize with daily environmental cycles. Although cellular rhythms are self-sustained and cell-intrinsic, in mammals, the master regulator of timekeeping is localized within the hypothalamic SCN (suprachiasmatic nucleus). Molecular models for mammalian circadian rhythms have focused largely on transcriptional–translational feedback loops, but recent data have revealed essential contributions by intracellular signalling mechanisms. cAMP and Ca2+ signalling are not only regulated by the cellular clock, but also contribute directly to the timekeeping mechanism, in that appropriate manipulations determine the canonical pacemaker properties of amplitude, phase and period. It is proposed that daily auto-amplification of second messenger activity, through paracrine neuropeptidergic coupling, is necessary and sufficient to account for the increased amplitude, accuracy and robustness of SCN timekeeping.
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38

Phipps, Thomas E. "Timekeeping evidence refutes the relativity principle." Physics Essays 29, no. 1 (March 30, 2016): 62–64. http://dx.doi.org/10.4006/0836-1398-29.1.62.

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39

Clover, Frank M. "Timekeeping and Dyarchy in Vandal Africa." Antiquité Tardive 11 (January 2004): 45–64. http://dx.doi.org/10.1484/j.at.2.300249.

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40

Dobson, Christopher M. "Dynamics and Timekeeping in Biological Systems." Annual Review of Biochemistry 83, no. 1 (June 2, 2014): 159–64. http://dx.doi.org/10.1146/annurev-biochem-013014-102724.

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41

Winkler, G. M. R. "Changes at USNO in global timekeeping." Proceedings of the IEEE 74, no. 1 (1986): 151–55. http://dx.doi.org/10.1109/proc.1986.13425.

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42

Salomé, Patrice A., Qiguang Xie, and C. Robertson McClung. "Circadian Timekeeping during Early Arabidopsis Development." Plant Physiology 147, no. 3 (May 14, 2008): 1110–25. http://dx.doi.org/10.1104/pp.108.117622.

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43

HARDIN, Paul E. "Molecular mechanisms of circadian timekeeping inDrosophila." Sleep and Biological Rhythms 7, no. 4 (October 2009): 235–42. http://dx.doi.org/10.1111/j.1479-8425.2009.00412.x.

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44

van Ooijen, Gerben, and Andrew J. Millar. "Non-transcriptional oscillators in circadian timekeeping." Trends in Biochemical Sciences 37, no. 11 (November 2012): 484–92. http://dx.doi.org/10.1016/j.tibs.2012.07.006.

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45

Austin, Judith, and Cynthia Kenyon. "Developmental Timekeeping: Marking time with antisense." Current Biology 4, no. 4 (April 1994): 366–69. http://dx.doi.org/10.1016/s0960-9822(00)00082-8.

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46

Hardin, Paul E. "The Circadian Timekeeping System of Drosophila." Current Biology 15, no. 17 (September 2005): R714—R722. http://dx.doi.org/10.1016/j.cub.2005.08.019.

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47

Derevianko, Andrei. "Publisher Correction: Accurate and stable timekeeping." Nature Reviews Physics 1, no. 9 (August 9, 2019): 577. http://dx.doi.org/10.1038/s42254-019-0103-x.

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48

Matsakis, D. "Timekeeping at the US naval observatory." IEEE Aerospace and Electronic Systems Magazine 18, no. 6 (June 2003): 9–14. http://dx.doi.org/10.1109/maes.2003.1209584.

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49

Stevens, Michael C., Kent A. Kiehl, Godfrey Pearlson, and Vince D. Calhoun. "Functional neural circuits for mental timekeeping." Human Brain Mapping 28, no. 5 (2007): 394–408. http://dx.doi.org/10.1002/hbm.20285.

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50

WITHINGTON, F. N., and W. J. KLEPCZYNSKI. "Operational Results of GPS in Timekeeping." Navigation 33, no. 1 (March 1986): 60–71. http://dx.doi.org/10.1002/j.2161-4296.1986.tb00924.x.

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