keyword
MENU ▼
Read by QxMD icon Read
search

Clock

keyword
https://www.readbyqxmd.com/read/29053749/phylogeography-and-genetic-effects-of-habitat-fragmentation-on-endemic-urophysa-ranunculaceae-in-yungui-plateau-and-adjacent-regions
#1
Deng-Feng Xie, Min-Jie Li, Jin-Bo Tan, Megan Price, Qun-Ying Xiao, Song-Dong Zhou, Yan Yu, Xing-Jin He
Urophysa is a Chinese endemic genus with only two species (U. rockii and U. henryi) distributed in Yungui Plateau (Guizhou Province) and adjacent regions (i.e., Provinces of Hunan, Hubei, Chongqing and Sichuan). The aim of this study was to determine the genetic diversity and population differentiation within Urophysa and investigate the effect of the Yungui Plateau uplift and climate oscillations on evolution of Urophysa. In this study, micro-morphological characteristics, nine microsatellite loci (SSR), two nuclear loci (ITS and ETS) and two chloroplast fragments (psbA-trnH and trnL-trnF) were used to analyze the phylogenetic relationships and assess genetic and phylogeographical structure of Urophysa...
2017: PloS One
https://www.readbyqxmd.com/read/29053333/spin-resonance-clock-transition-of-the-endohedral-fullerene-15-n-c_-60
#2
R T Harding, S Zhou, J Zhou, T Lindvall, W K Myers, A Ardavan, G A D Briggs, K Porfyrakis, E A Laird
The endohedral fullerene ^{15}N@C_{60} has narrow electron paramagnetic resonance lines which have been proposed as the basis for a condensed-matter portable atomic clock. We measure the low-frequency spectrum of this molecule, identifying and characterizing a clock transition at which the frequency becomes insensitive to magnetic field. We infer a linewidth at the clock field of 100 kHz. Using experimental data, we are able to place a bound on the clock's projected frequency stability. We discuss ways to improve the frequency stability to be competitive with existing miniature clocks...
October 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29053146/the-plant-circadian-clock-influences-rhizosphere-community-structure-and-function
#3
Charley J Hubbard, Marcus T Brock, Linda Ta van Diepen, Loïs Maignien, Brent E Ewers, Cynthia Weinig
Plants alter chemical and physical properties of soil, and thereby influence rhizosphere microbial community structure. The structure of microbial communities may in turn affect plant performance. Yet, outside of simple systems with pairwise interacting partners, the plant genetic pathways that influence microbial community structure remain largely unknown, as are the performance feedbacks of microbial communities selected by the host plant genotype. We investigated the role of the plant circadian clock in shaping rhizosphere community structure and function...
October 20, 2017: ISME Journal
https://www.readbyqxmd.com/read/29053120/-results-of-multicenter-study-of-efficacy-and-safety-of-divaza-in-the-treatment-of-the-asthenic-and-mild-to-moderate-cognitive-disorders-in-elderly-and-senile-subjects
#4
V А Parfenov, P R Kamchatnov, О V Vorobyova, А V Gustov, К S Glushkov, О B Doronina
AIM: To study the efficacy and safety of divasa in elderly and senile subjects with asthenic and mild to moderate cognitive disorders. MATERIAL AND METHODS: The study included 126 patients with clinically significant asthenia and mild to moderate cognitive disorders. Asthenia was assessed with MFI-20, cognitive disorders with MMSE, clock drawing test and verbal association test. All patients were treated with divasa in dose 2 tablets 3 times a day. RESULTS AND CONCLUSION: The efficacy and safety of divasa in asthenic and mild to moderate cognitive disorders in elderly and senile subjects were shown...
2017: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/29052517/constitutive-expression-of-osdof4-encoding-a-c2-c2-zinc-finger-transcription-factor-confesses-its-distinct-flowering-effects-under-long-and-short-day-photoperiods-in-rice-oryza-sativa-l
#5
Qi Wu, Xue Liu, Dedong Yin, Hua Yuan, Qi Xie, Xianfeng Zhao, Xiaobing Li, Lihuang Zhu, Shigui Li, Dayong Li
BACKGROUND: Dof (DNA binding with one finger) proteins, a class of plant-specific transcription factors which contain a conserved C2-C2-type zinc finger domain, are involved in many fundamental processes. In the Arabidopsis photoperiod response pathway, CDF (CYCLING DOF FACTOR) proteins have a primary role as acting via transcriptional repression of the direct FLOWERING LOCUS T (FT) activator CONSTANS (CO). Our previous study indicated that one of CDF homologs, OsDOf12, was involved in photoperiodic flowering...
October 19, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/29051754/a-cellular-fusion-cascade-regulated-by-laea-is-required-for-sclerotial-development-in-aspergillus-flavus
#6
Xixi Zhao, Joseph E Spraker, Jin Woo Bok, Thomas Velk, Zhu-Mei He, Nancy P Keller
Aspergillus flavus is a saprophytic soil fungus that poses a serious threat worldwide as it contaminates many food and feed crops with the carcinogenic mycotoxin called aflatoxin. This pathogen persists as sclerotia in the soil which enables fungal survival in harsh environmental conditions. Sclerotia formation by A. flavus depends on successful cell communication and hyphal fusion events. Loss of LaeA, a conserved developmental regulator in fungi, abolishes sclerotia formation in this species whereas overexpression (OE) of laeA results in enhanced sclerotia production...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29051673/local-tidal-regime-dictates-plasticity-of-expression-of-locomotor-activity-rhythms-of-american-horseshoe-crabs-limulus-polyphemus
#7
Rebecca L Anderson, Winsor H Watson, Christopher C Chabot
While horseshoe crabs Limulus polyphemus from regions with two daily tides express endogenous circatidal (~ 12.4 h) activity rhythms, much less is known about locomotor rhythm expression in horseshoe crabs from other tidal regimes. This study investigated whether horseshoe crabs (1) always express activity rhythms consistent with their natural tides, and (2) can alter activity rhythm expression in response to novel tide cycles. Activity rhythms of animals from environments with two daily tides (Gulf of Maine, 43°6' N/70°52' W, and Massachusetts, 41°32' N/70°40'W), one dominant daily tide (Apalachee Bay, Florida, 29°58' N/84°20' W), and microtides (Indian River Lagoon, Florida, 28°5' N/80°35' W) were recorded in 2011-2013 during three artificial tide conditions: no tides, a 12...
April 2017: Marine Biology
https://www.readbyqxmd.com/read/29050555/natural-variation-in-human-clocks
#8
Malcolm von Schantz
Our own species has a diurnal activity pattern and an average circadian period of 24.2h. Exact determination of circadian period requires expensive and intrusive protocols, and investigators are therefore using chronotype questionnaires as a proxy quantitative measure. Both measures show a normal distribution suggestive of a polygenic trait. The genetic components of the 24-h feedback loop that generates circadian rhythms within our cells have been mapped in detail, identifying a number of candidate genes which have been investigated for genetic polymorphisms relating to the phenotypic variance...
2017: Advances in Genetics
https://www.readbyqxmd.com/read/29050554/natural-variation-and-genetics-of-photoperiodism-in-wyeomyia-smithii
#9
William E Bradshaw, Christina M Holzapfel
Seasonal change in the temperate and polar regions of Earth determines how the world looks around us and, in fact, how we live our day-to-day lives. For biological organisms, seasonal change typically involves complex physiological and metabolic reorganization, the majority of which is regulated by photoperiodism. Photoperiodism is the ability of animals and plants to use day length or night length, resulting in life-historical transformations, including seasonal development, migration, reproduction, and dormancy...
2017: Advances in Genetics
https://www.readbyqxmd.com/read/29050553/natural-variation-of-the-circadian-clock-in-neurospora
#10
Bala S C Koritala, Kwangwon Lee
Most living organisms on earth experience daily and expected changes from the rotation of the earth. For an organism, the ability to predict and prepare for incoming stresses or resources is a very important skill for survival. This cellular process of measuring daily time of the day is collectively called the circadian clock. Because of its fundamental role in survival in nature, there is a great interest in studying the natural variation of the circadian clock. However, characterizing the genetic and molecular mechanisms underlying natural variation of circadian clocks remains a challenging task...
2017: Advances in Genetics
https://www.readbyqxmd.com/read/29047536/phase-sensitive-optical-time-domain-reflectometric-system-based-on-a-single-source-dual-heterodyne-detection-scheme
#11
Miao Yu, Minhan Liu, Tianying Chang, Jinpeng Lang, Jiandong Chen, Hong-Liang Cui
A phase-sensitive optical time-domain reflectometric (ϕ-OTDR) system based on a novel single-source dual heterodyne detection scheme is proposed and demonstrated. It uses the optical beat-frequency signals as the local oscillator signal containing the modulated frequency, frequency drift and phase fluctuation, while the signal to be detected contains all the forgoing spectral components, in addition to the vibration signal under measurement. Frequency mixing serves to isolate the pure vibration signal from the omnipresent residual frequency and phase fluctuations caused by a less strictly synchronous clock, inherent characteristics of the laser and the acousto-optical modulator, and environment temperature changes...
May 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047487/10-23%C3%A2-%C3%A2-mcps-laser-pseudo-code-ranging-system-with-0-33%C3%A2-%C3%A2-mm-1%C3%AF-pseudo-range-measurement-precision
#12
Xiaonan Yu, Shoufeng Tong, Lei Zhang, Yan Dong, Xin Zhao, Yue Qiao
The inter-satellite laser link is the backbone of the next inter-satellite information network, and ranging and communication are the main functions of the inter-satellite laser link. This study focuses on the inter-satellite laser ranging based on the pseudo-code correlation technology. In this paper, several typical laser-ranging methods have been compared and we determined that the laser pseudo-code ranging architecture is more suitable for the inter-satellite laser communication link. The pseudo-code ranging system is easy to combine with a digital communication system, and we used it to calculate integer ambiguity by modulating the time information...
July 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29045896/microbes-rev-up-host-metabolism-around-the-clock
#13
Geoffrey N Pronovost, Elaine Y Hsiao
There is increasing evidence that the microbiome regulates host metabolism, but specific mechanisms underlying these interactions remain poorly understood. In a recent paper in Science, Wang et al. (2017) reveal that the gut microbiota regulates the expression of circadian-clock genes to impact host lipid metabolism and body composition.
October 17, 2017: Immunity
https://www.readbyqxmd.com/read/29045837/the-circadian-clock-gene-bmal1-controls-thyroid-hormone-mediated-spectral-identity-and-cone-photoreceptor-function
#14
Onkar B Sawant, Amanda M Horton, Olivia F Zucaro, Ricky Chan, Vera L Bonilha, Ivy S Samuels, Sujata Rao
Circadian clocks regulate various aspects of photoreceptor physiology, but their contribution to photoreceptor development and function is unclear. Cone photoreceptors are critical for color vision. Here, we define the molecular function of circadian activity within cone photoreceptors and reveal a role for the clock genes Bmal1 and Per2 in regulating cone spectral identity. ChIP analysis revealed that BMAL1 binds to the promoter region of the thyroid hormone (TH)-activating enzyme type 2 iodothyronine deiodinase (Dio2) and thus regulates the expression of Dio2...
October 17, 2017: Cell Reports
https://www.readbyqxmd.com/read/29044737/chronic-bmy7378-treatment-alters-behavioral-circadian-rhythms
#15
Jhenkruthi Vijaya Shankara, Angélique Orr, Richelle Mychasiuk, Michael C Antle
The mammalian circadian clock is synchronized to the day:night cycle by light. Serotonin modulates the circadian effects of light, with agonists inhibiting response to light and antagonists enhancing responses to light. A special class of serotonergic compounds, the mixed 5-HT1A agonist/antagonists, potentiate light-induced phase advances by up to 400% when administered acutely. In this study, we examine the effects of one of these mixed 5-HT1A agonist/antagonists, BMY7378, when administered chronically. Thirty adult male hamsters were administered either vehicle or BMY7378 via surgically implanted osmotic minipumps over a period of 28 days...
October 17, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29044063/cognitive-functions-and-normal-tension-glaucoma
#16
Akvile Daveckaite, Evelina Grusauskiene, Kestutis Petrikonis, Antanas Vaitkus, Lina Siaudvytyte, Ingrida Januleviciene
PURPOSE: Only a few studies have analyzed the potential link between glaucoma and cognitive function impairment. They have found controversial results. This study aims to perform quick cognitive function assessment with clock drawing test (CDT) using two different scoring systems and compare between normal tension glaucoma (NTG) and cataract patients. METHODS: Totally, 30 NTG and 30 patients with cataracts were included in a prospective, pilot study. The predrawn circle was given, and patients were asked to draw the clock showing a time of 11:10...
October 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29044060/interocular-symmetry-of-retinal-nerve-fiber-layer-and-optic-nerve-head-parameters-measured-by-cirrus-high-definition-optical-coherence-tomography-in-a-normal-pediatric-population
#17
Neelam Pawar, Devendra Maheshwari, Meenakshi Ravindran, Renagappa Ramakrishnan
PURPOSE: To determine interocular differences in the retinal nerve fiber layer (RNFL) and optic nerve head (ONH) parameters in a pediatric population using Cirrus high-definition optical coherence tomography (HD-OCT). METHODS: Seventy normal Indian children aged 5-17 years presenting to the Pediatric Clinic were included in this observational cross-sectional study. All subjects underwent a comprehensive ophthalmologic examination and an evaluation of the RNFL and ONH by Cirrus HD-OCT...
October 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29042894/genetic-association-of-the-period3-per3-clock-gene-with-bipolar-disorder
#18
Paulo Marcos Brasil Rocha, Simone Becho Campos, Fernando Silva Neves, Humberto Corrêa da Silva Filho
OBJECTIVE: Circadian rhythms have been linked to psychiatric disorders such as Depression and Bipolar Disorder (BD). Given previous evidences of sleep/circadian disturbances as well as the genetic susceptibility for BD, we decided to investigate the possible link between the PERIOD3 (Per3) circadian gene and BD. METHODS: This is a genetic association case (BD) vs. control study of the Per3 gene. We further subdivided our BD sample into "good sleepers" (PSQI ≤5) and "poor sleepers" (PSQI>5) according to the Pittsburgh Sleep Quality Index (PSQI) global score, and then we assessed genetic association of the Per3 gene with sleep quality in the BD group...
September 2017: Psychiatry Investigation
https://www.readbyqxmd.com/read/29042575/role-of-the-qinghai-tibetan-plateau-uplift-in-the-northern-hemisphere-disjunction-evidence-from-two-herbaceous-genera-of-rubiaceae
#19
Tao Deng, Jian-Wen Zhang, Ying Meng, Sergei Volis, Hang Sun, Ze-Long Nie
To assess the role of the Qinghai-Tibetan Plateau uplift in shaping the intercontinental disjunction in Northern Hemisphere, we analyzed the origin and diversification within a geological timeframe for two relict herbaceous genera, Theligonum and Kelloggia (Rubiaceae). Phylogenetic relationships within and between Theligonum and Kelloggia as well as their relatives were inferred using five chloroplast markers with parsimony, Bayesian and maximum-likelihood approaches. Migration routes and evolution of these taxa were reconstructed using Bayesian relaxed molecular clock and ancestral area reconstruction...
October 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29041430/femtosecond-level-timing-fluctuation-suppression-in-atmospheric-frequency-transfer-with-passive-phase-conjunction-correction
#20
Fuyu Sun, Dong Hou, Danian Zhang, Jie Tian, Jianguo Hu, Xianhe Huang, Shijun Chen
We demonstrate femtosecond-level timing fluctuation suppression in indoor atmospheric comb-based frequency transfer with a passive phase conjunction correction technique. Timing fluctuations and Allan deviations are both measured to characterize the excess frequency instability incurred during the frequency transfer process. By transferring a 2 GHz microwave over a 52-m long free-space link in 5000 s, the total root-mean-square (RMS) timing fluctuation was measured to be about 280 fs with a fractional frequency instability on the order of 3 × 10(-13) at 1 s and 6 × 10(-17) at 1000 s...
September 4, 2017: Optics Express
keyword
keyword
38178
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"