«frequency gradient»
۸۳۳۳ نتیجهFrequency of CCR5 gene 32-basepair deletion in Croatian normal population.
A 32-basepair deletion polymorphism in the CCR5 chemokine receptor gene (CCR5 TROKUT 32) could increase the resistance to HIV-1 infection or delayed progression to AIDS. This mutant allele is common among Caucasians of Western European descent, but has not been observed in people
Clock polymorphism in Pacific salmon: evidence for variable selection along a latitudinal gradient.
Seasonal timing of life-history events is often under strong natural selection. The Clock gene is a central component of an endogenous circadian clock that senses changes in photoperiod (day length) and mediates seasonal behaviours. Among Pacific salmonids (Oncorhynchus spp.), se
Natural selection along an environmental gradient: a classic cline in mouse pigmentation.
We revisited a classic study of morphological variation in the oldfield mouse (Peromyscus polionotus) to estimate the strength of selection acting on pigmentation patterns and to identify the underlying genes. We measured 215 specimens collected by Francis Sumner in the 1920s fro
Frequency Gradient Within Coronary Sinus Predicts the Long‐Term Outcome of Persistent Atrial Fibrillation Catheter Ablation
BACKGROUND The coronary sinus (CS), as a junction of the atria, contributes to atrial fibrillation (AF) by developing unstable reentry, and isolating the atria by ablation at the CS could terminate AF. The present study evaluated whether AF activities at the CS in a subset of pat
Detection of an inhibitory cortical gradient underlying peak shift in learning: a neural basis for a false memory.
Experience often does not produce veridical memory. Understanding false attribution of events constitutes an important problem in memory research. "Peak shift" is a well-characterized, controllable phenomenon in which human and animal subjects that receive reinforcement associate
Left-to-right gradient of atrial frequencies during acute atrial fibrillation in the isolated sheep heart.
BACKGROUND Recent studies demonstrated spatiotemporal organization in atrial fibrillation (AF). We hypothesized that waves emanating from sources in the left atrium (LA) undergo fragmentation, resulting in left-to-right frequency gradient. Our objective was to characterize impuls
A Map of Periodicity Orthogonal to Frequency Representation in the Cat Auditory Cortex
Harmonic sounds, such as voiced speech sounds and many animal communication signals, are characterized by a pitch related to the periodicity of their envelopes. While frequency information is extracted by mechanical filtering of the cochlea, periodicity information is analyzed by
Left-to-right atrial inward rectifier potassium current gradients in patients with paroxysmal versus chronic atrial fibrillation.
BACKGROUND Recent evidence suggests that atrial fibrillation (AF) is maintained by high-frequency reentrant sources with a left-to-right-dominant frequency gradient, particularly in patients with paroxysmal AF (pAF). Unequal left-to-right distribution of inward rectifier K(+) cur
Fire-frequency effects on vegetation in north Florida pinelands: Another look at the long-term Stoddard Fire Research Plots at Tall Timbers Research Station
0378-1127/$ see front matter 2011 Elsevier B.V. A doi:10.1016/j.foreco.2011.10.014 q Nomenclature: Kartesz, J.T., 1994. A synonymized of the United States, Canada, and Greenland, second ed ⇑ Corresponding author. Fax: 1 850 668 7781. E-mail addresses: Jeffglitz@aol.com (J.S. Glit
Letter by Berenfeld and Jalife regarding article "dominant frequency of atrial fibrillation correlates poorly with atrial fibrillation cycle length".
BACKGROUND Localized sites of high frequency during atrial fibrillation (AF) are used as target sites to eliminate AF. Spectral analysis is used experimentally to determine these sites. The purpose of this study was to compare dominant frequencies (DF) with AF cycle length (AFCL)