نتایج جستجو برای: transients
تعداد نتایج: 10596 فیلتر نتایج به سال:
In intact Xenopus embryos, an increase in intracellular Ca(2+) in the dorsal ectoderm is both necessary and sufficient to commit the ectoderm to a neural fate. However, the relationship between this Ca(2+) increase and the expression of early neural genes is as yet unknown. In intact embryos, studying the interaction between Ca(2+) signaling and gene expression during neural induction is compli...
ObjectiÕes: To study the time course of Ca transients recorded from the left ventricular epicardial surface of isolated hearts from rabbits with heart failure and to correlate the results with mechanical function. Methods: Heart failure was induced in the rabbit 8 weeks Ž . after coronary ligation ns17 with 13 controls. Echocardiography was used to assess in vivo left ventricular dysfunction. T...
We present the Palomar Transient Factory discoveries and the photometric and spectroscopic observations of PTF11kmb and PTF12bho. We show that both transients have properties consistent with the class of calcium-rich gap transients, specifically lower peak luminosities and rapid evolution compared to ordinary supernovae, and a nebular spectrum dominated by [Ca II] emission. A striking feature o...
Many erbium doped fiber amplifier (EDFA) based multi-wavelength optical networks employ techniques such as burst-switching or packet switching where the time interval between traffic blocks can be long enough to induce EDFA optical power transients. The optical power transients are created by abrupt changes in the average input power to the EDFAs and can adversely affect the performance of the ...
Spontaneous cytosolic calcium transients and oscillations have been reported in various tissues of nonhuman and human origin but not in human midbrain-derived stem cells. Using confocal microfluorimetry, we studied spontaneous calcium transients and calcium-regulating mechanisms in a human ventral mesencephalic stem cell line undergoing proliferation and neuronal differentiation. Spontaneous ca...
Due to the non-periodic nature of noise, the steady state response of a dynamic system to a periodic input is still subject to noise transients (noise leakage errors). For lightly damped systems these noise transients (significantly) increase the variance of frequency response function (FRF) measurements [1]. This paper presents a method for suppressing the noise transients in FRF measurements ...
This paper presents a summary of a literature search performed by the authors as part of an ongoing research project aimed at developing more reliable models for representing transformers in lowand mid-frequency transients. The document includes a summary of models proposed to date, as well as modeling guidelines for nonlinear and frequency dependent phenomena associated with lowand midfrequenc...
Confocal microscopy of fluo-4 fluorescence in pressurized rat mesenteric small arteries subjected to low-frequency electrical field stimulation revealed Ca2+ transients in perivascular nerves and novel, spatially localized Ca2+ transients in adjacent smooth muscle cells. These muscle Ca2+ transients occur with a very brief latency to the stimulus pulse (most <3 ms). They are wider (approximatel...
We discuss the recent efforts to use a sub-class of neutron-star X-ray transients (the quasi-persistent transients) to probe the properties of neutron-star crusts and cores. Quasi-persistent X-ray transients experience accretion episodes lasting years to decades, instead of the usual weeks to months of ordinary, shortduration transients. These prolonged accretion episodes should significantly h...
This thesis aims at extending the capabilities of ultrafast science in manipulating light fields. The instantaneous field of light transients has been tailored on demand with attosecond resolution by implementing ultrawideband field synthesis in the visible and flanking ranges. First experiments utilizing the considerably improved resolution, such as the study of ionization dynamics of the Kr a...
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