967 resultados para Selim III, Sultan of the Turks, 1761-1808.


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Mode of access: Internet.

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The original title is Shejereh i Turk.

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Translation of Guerres des Turcs avec la Pologne, la Moscovie et la Hongrie, par le Sr. de La Croix. 1689.

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It is becoming clear that the detection and integration of synaptic input and its conversion into an output signal in cortical neurons are strongly influenced by background synaptic activity or "noise." The majority of this noise results from the spontaneous release of synaptic transmitters, interacting with ligand-gated ion channels in the postsynaptic neuron [Berretta N, Jones RSG (1996); A comparison of spontaneous synaptic EPSCs in layer V and layer II neurones in the rat entorhinal cortex in vitro. J Neurophysiol 76:1089-1110; Jones RSG, Woodhall GL (2005) Background synaptic activity in rat entorhinal cortical neurons: differential control of transmitter release by presynaptic receptors. J Physiol 562:107-120; LoTurco JJ, Mody I, Kriegstein AR (1990) Differential activation of glutamate receptors by spontaneously released transmitter in slices of neocortex. Neurosci Lett 114:265-271; Otis TS, Staley KJ, Mody I (1991) Perpetual inhibitory activity in mammalian brain slices generated by spontaneous GABA release. Brain Res 545:142-150; Ropert N, Miles R, Korn H (1990) Characteristics of miniature inhibitory postsynaptic currents in CA1 pyramidal neurones of rat hippocampus. J Physiol 428:707-722; Salin PA, Prince DA (1996) Spontaneous GABAA receptor-mediated inhibitory currents in adult rat somatosensory cortex. J Neurophysiol 75:1573-1588; Staley KJ (1999) Quantal GABA release: noise or not? Nat Neurosci 2:494-495; Woodhall GL, Bailey SJ, Thompson SE, Evans DIP, Stacey AE, Jones RSG (2005) Fundamental differences in spontaneous synaptic inhibition between deep and superficial layers of the rat entorhinal cortex. Hippocampus 15:232-245]. The function of synaptic noise has been the subject of debate for some years, but there is increasing evidence that it modifies or controls neuronal excitability and, thus, the integrative properties of cortical neurons. In the present study we have investigated a novel approach [Rudolph M, Piwkowska Z, Badoual M, Bal T, Destexhe A (2004) A method to estimate synaptic conductances from membrane potential fluctuations. J Neurophysiol 91:2884-2896] to simultaneously quantify synaptic inhibitory and excitatory synaptic noise, together with postsynaptic excitability, in rat entorhinal cortical neurons in vitro. The results suggest that this is a viable and useful approach to the study of the function of synaptic noise in cortical networks. © 2007 IBRO.

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Fifty six specimens of the hybrid tambacu (Piaractus mesopotamicus Holmberg, 1887 male x Colossoma macropomum Cuvier, 1818 female) were collected from fishfarm of Guariba, São Paulo, to evaluate their haematology. Fishes presented 400.0 to 3,100.0 g total weight and 20.0 to 52.0 cm total length. Haemoglobin, haematocrit, mean corpuscular haemoglobin content (MCHC) and percentage of defense blood cells including leucocytes and thrombocytes, were studied. Statistical analysis showed positive correlation (P<0.01) between haematocrit, MCHC and haemoglobin rate. Nevertheless, thrombocytes and lymphocytes showed negative correlation (P<0.01).

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"Two hundred copies ... printed for private distribution."

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The II-III loop of the skeletal muscle dihydropyridine receptor (DHPR) α1S subunit is responsible for bidirectional-signaling interactions with the ryanodine receptor (RyR1): transmitting an orthograde, excitation–contraction (EC) coupling signal to RyR1 and receiving a retrograde, current-enhancing signal from RyR1. Previously, several reports argued for the importance of two distinct regions of the skeletal II-III loop (residues R681–L690 and residues L720–Q765, respectively), claiming for each a key function in DHPR–RyR1 communication. To address whether residues 720–765 of the II-III loop are sufficient to enable skeletal-type (Ca2+ entry-independent) EC coupling and retrograde interaction with RyR1, we constructed a green fluorescent protein (GFP)-tagged chimera (GFP-SkLM) having rabbit skeletal (Sk) DHPR sequence except for a II-III loop (L) from the DHPR of the house fly, Musca domestica (M). The Musca II-III loop (75% dissimilarity to α1S) has no similarity to α1S in the regions R681–L690 and L720–Q765. GFP-SkLM expressed in dysgenic myotubes (which lack endogenous α1S subunits) was unable to restore EC coupling and displayed strongly reduced Ca2+ current densities despite normal surface expression levels and correct triad targeting (colocalization with RyR1). Introducing rabbit α1S residues L720–L764 into the Musca II-III loop of GFP-SkLM (substitution for Musca DHPR residues E724–T755) completely restored bidirectional coupling, indicating its dependence on α1S loop residues 720–764 but its independence from other regions of the loop. Thus, 45 α1S-residues embedded in a very dissimilar background are sufficient to restore bidirectional coupling, indicating that these residues may be a site of a protein–protein interaction required for bidirectional coupling.

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Exquisite album of calligraphy (muraqqaʻ or murakkaa) with design for a monumental inscription to appear in stone on a commemorative range marker (menzil taşı) of Bilâl Ağa (d.1807?), likely executed by Yesari Mehmed Esad Efendi (d.1798), the great Ottoman master of nastaʻlīq (talik).

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Mode of access: Internet.

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It is not possible to trace the early demographic development of the Turks and Caicos Islands due to lack of data, but what is evident from the limited historical data is that population developments beginning in 1921 and up to 1970 followed the same path as other Caribbean Islands. The Turks and Caicos Islands have experienced unprecedented population growth over the last twenty years due largely to the immigration of people from neighbouring countries seeking employment created by the development of tourism. Such rapid population changes for the small island group present many social, economic, environmental and political challenges. Population projections are essential so that policymakers and decision makers can make informed judgements about future strategies, policies and programmes.