نتایج جستجو برای: ctp scoring
تعداد نتایج: 41561 فیلتر نتایج به سال:
BACKGROUND CT perfusion (CTP) is used to estimate the extent of ischemic core and penumbra in patients with acute ischemic stroke. CTP reliability, however, is limited. This study aims to identify regions misclassified as ischemic core on CTP, using infarct on follow-up noncontrast CT. We aim to assess differences in volumetric and perfusion characteristics in these regions compared to areas th...
CTP synthetase is an essential enzyme that generates the CTP required for the synthesis of nucleic acids and membrane phospholipids. In this study, we examined the phosphorylation of the human CTPS1-encoded CTP synthetase 1 by protein kinase A. CTP synthetase 1 was expressed and purified from a Saccharomyces cerevisiae ura7Delta ura8Delta double mutant that lacks CTP synthetase activity. Using ...
BACKGROUND Child-Turcotte-Pugh (CTP) score is the standard tool to assess hepatic reserve in hepatocellular carcinoma (HCC), and CTP-A is the classic group for active therapy. However, CTP stratification accuracy has been questioned. We hypothesized that plasma insulin-like growth factor 1 (IGF-1) is a valid surrogate for hepatic reserve to replace the subjective parameters in CTP score to impr...
CTP synthetase is a cytosolic-associated glutamine amidotransferase enzyme that catalyzes the ATP-dependent transfer of the amide nitrogen from glutamine to the C-4 position of UTP to form CTP. In the yeast Saccharomyces cerevisiae, the reaction product CTP is an essential precursor of all membrane phospholipids that are synthesized via the Kennedy (CDP-choline and CDP-ethanolamine branches) an...
BACKGROUND AND PURPOSE Among patients with acute ischemic stroke, we determine computed tomographic perfusion (CTP) thresholds associated with follow-up infarction at different stroke onset-to-CTP and CTP-to-reperfusion times. METHODS Acute ischemic stroke patients with occlusion on computed tomographic angiography were acutely imaged with CTP. Noncontrast computed tomography and magnectic re...
BACKGROUND Recently, a modified insulin-like growth factor-1 (IGF)-Child-Turcotte-Pugh (CTP) classification was proposed to improve the original CTP classification. This study aimed to validate the new IGF-CTP classification system as a prognostic maker for patients with hepatocellular carcinoma (HCC) in a hepatitis B virus endemic area. METHODS We conducted a post-hoc analysis of a prospecti...
The allosteric control of aspartate transcarbamoylase (ATCase, EC 2.1.3.2) of Escherichia coli involves feedback inhibition by both CTP and UTP rather than just CTP alone. It has been known that CTP functions as a heterotropic inhibitor of catalysis; however, the inhibition by CTP alone is incomplete (50-70% at various aspartate concentrations) and there is only a partial occupancy of the allos...
The Collection Tree Protocol (CTP) is a well-know protocol that provides a reliable collection service for wireless sensor networks. In this report, we describe our implementation of CTP for the version 3.0 of the Castalia wireless sensor networks simulator. Besides being a reference for researchers interested in experimenting with CTP in Castalia, this report also provides a throughout descrip...
Cytidine triphosphate synthetases (CTPSs) synthesize CTP and regulate its intracellular concentration through direct interactions with the four ribonucleotide triphosphates. In particular, CTP product is a feedback inhibitor that competes with UTP substrate. Selected CTPS mutations that impart resistance to pyrimidine antimetabolite inhibitors also relieve CTP inhibition and cause a dramatic in...
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