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M Sawicki, J Sołek-Pastuszka, K Chamier-Ciemińska, A Walecka, J Walecki, R Bohatyrewicz
BACKGROUND: In the diagnosis of brain death (BD), computed tomography angiography (CTA) results in some cases show intracranial filling, leading to diagnostic confusion. Because cerebral circulatory arrest commences at the capillary level, we hypothesized that computed tomography perfusion (CTP) would be a more sensitive approach than CTA; therefore, the aim of the study was to compare the sensitivities of CTP and CTA in the diagnosis of BD. MATERIAL AND METHODS: Whole brain CTP was performed in patients in the intensive care unit diagnosed with BD and CTA was derived from CTP datasets...
November 17, 2017: Clinical Neuroradiology
Ragupathi Nagarajan, Kulvinder S Gill
Rubisco activase of plants evolved in a stepwise manner without losing its function to adapt to the major evolutionary events including endosymbiosis and land colonization. Rubisco activase is an essential enzyme for photosynthesis, which removes inhibitory sugar phosphates from the active sites of Rubisco, a process necessary for Rubisco activation and carbon fixation. The gene probably evolved in cyanobacteria as different species differ for its presence. However, the gene is present in all other plant species...
November 14, 2017: Plant Molecular Biology
Kazutoshi Kubo, Yu-Shiuan Cheng, Boran Zhou, Kai-Nan An, Steven L Moran, Peter C Amadio, Xiaoming Zhang, Chunfeng Zhao
Carpal tunnel syndrome (CTS) is the most common entrapment neuropathy occurring in upper limbs. The etiology, however, has not been fully understood yet. Median nerve could be compressed by either increase of carpal tunnel pressure (CTP) or direct impingement when it is forced toward to carpal ligament especially in wrist flexion leading to CTS development. Thus, the increase of carpal tunnel pressure is considered an important role in CTS development. It has been identified that forces applied to the palm would affect the CTP...
November 4, 2017: Journal of Biomechanics
Yue-Meng Wan, Yu-Hua Li, Hua-Mei Wu, Zhi-Yuan Xu, Ying Xu, Li-Hong Yang, Xi-Nan Wu, Jin-Hui Yang
Portal vein thrombosis (PVT) is common in patients with cirrhosis undergoing transjugular intrahepatic portosystemic shunt (TIPS). This study had 3-fold aims: to assess risk factors for PVT; to determine the efficacy of anticoagulant therapy; to investigate the impact of PVT on clinical outcomes in TIPS-treated cirrhosis.Between June 2012 and February 2016, 126 TIPS-treated patients with cirrhosis were enrolled and studied prospectively. Enrolled patients were screened for PVT before TIPS and at 3, 6, 12, and 24 months post-TIPS...
November 2017: Medicine (Baltimore)
Juan F Arenillas, Elisa Cortijo, Pablo García-Bermejo, Elad I Levy, Reza Jahan, Mayank Goyal, Jeffrey L Saver, Gregory W Albers
We aimed to evaluate how predefined candidate cerebral perfusion parameters correlate with collateral circulation status and to assess their capacity to predict infarct growth in patients with acute ischemic stroke (AIS) eligible for endovascular therapy. Patients enrolled in the SWIFT PRIME trial with baseline computed tomography perfusion (CTP) scans were included. RAPID software was used to calculate mean relative cerebral blood volume (rCBV) in hypoperfused regions, and hypoperfusion index ratio (HIR). Blind assessments of collaterals were performed using CT angiography in the whole sample and cerebral angiogram in the endovascular group...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
Tolga Turan Dündar, Ayşe Aralaşmak, Hüseyin Özdemir, Mehmet Hakan Seyithanoğlu, Ömer Uysal, Hüseyin Toprak, Serkan Kitiş, Erdinç Özek, Alpay Alkan
AIM: To compare effectiveness of contrast-enhanced MRA (CE-MRA), 3D-Time-of-flight MRA (3D-TOF-MRA) and subtracted CTA from CTP (sub-CTA) in residue evaluation of intracranial aneurysms treated either with coiling or clipping. MATERIAL AND METHODS: Sixteen treated aneurysms, which were evaluated with three methods within two weeks after the operation, were enrolled. The success of each imaging techniques in demonstration of residue aneurysm and nearby vessels was compared by Fisher\'s Exact Test...
October 18, 2017: Turkish Neurosurgery
Cyriac Abby Philips, Lijesh Kumar, Philip Augustine
INTRODUCTION: Large spontaneous portosystemic shunts (SPSS) are seen in a subset of patients with liver disease and medically refractory recurrent/persistent hepatic encephalopathy (MRHE). Shunt occlusion has been shown to improve clinical outcomes. METHODS: We retrospectively analyzed patient characteristics, SPSS attributes, procedural features, baseline clinical and investigational parameters, neurological outcomes, adverse effects (procedure and portal hypertension related), and risk factors predicting outcomes in liver disease patients undergoing shunt occlusion procedure for MRHE...
November 10, 2017: Indian Journal of Gastroenterology: Official Journal of the Indian Society of Gastroenterology
Gerd Horneff, Ariane Klein, Gerd Ganser, Michaela Sailer-Höck, Annette Günther, Ivan Foeldvari, Frank Weller-Heinemann
OBJECTIVE: Several effective pharmacologic treatment options for polyarticual juvenile idiopathic arthritis (JIA) have emerged but initial treatment is heterogeneous in Germany. Therefore, the German Society of Pediatric Rheumatolgy has established a commission to develop consensus "Protocols on classification, monitoring and therapy in children's rheumatology (PRO-KIND)" to harmonize diagnostic and treatment approaches for new-onset JIA in Germany. METHODS: A set of definitions for in- and exclusion, diagnostic workup, parameters for the evaluation of disease activity criteria, therapeutic options, medication dosing, monitoring recommendations, targets, definitions of a therapy failure and four therapeutic algorithms developed by a working group were agreed by web based survey to which all members of the GKJR have been invited...
November 7, 2017: Pediatric Rheumatology Online Journal
Jaiyanth Daniel, Liz Abraham, Amanda Martin, Xyryl Pablo, Shelby Reyes
The Rv2477c protein of Mycobacterium tuberculosis (Mtb) belongs to the ATP-binding cassette (ABC) subfamily F that contains proteins with tandem nucleotide-binding domains but lacking transmembrane domains. ABC-F subfamily proteins have been implicated in diverse cellular processes such as translation, antibiotic resistance, cell growth and nutrient sensing. In order to investigate the biochemical characteristics of Rv2477c, we expressed it in Escherichia coli, purified it and characterized its enzymatic functions...
October 31, 2017: Biochemical and Biophysical Research Communications
Alan James Cameron, Christopher J Squire, Patrick J B Edwards, Elena Harjes, Vijayalekshmi Sarojini
Herein we report the unique conformations adopted by linear and cyclic tetrapeptides (CTPs) containing 2-aminobenzoic acid (2-Abz) in solution and as single crystals. The crystal structure of the linear tetrapeptide H2N-D-Leu-D-Phe-2-Abz-D-Ala-COOH (1) reveals a novel planar peptidomimetic β-turn stabilized by three hydrogen bonds and is in agreement with its NMR structure in solution. While CTPs are often synthetically inaccessible or cyclize in poor yield, both 1 and its N-Me-D-Phe analogue (2) adopt pseudo-cyclic frameworks enabling near quantitative conversion to the corresponding CTPs 3 and 4...
November 2, 2017: Chemistry, An Asian Journal
Chia-Chun Chang, Yung-Ming Jeng, Min Peng, Gerson Dierley Keppeke, Li-Ying Sung, Ji-Long Liu
CTP synthase (CTPS) can aggregate into an intracellular macrostructure, the cytoophidium, in various organisms including human cells. Previous studies have shown that assembly of human CTPS cytoophidia may be correlated with the cellular metabolic status, and is able to promote the activity of CTPS. A correlation between the cytoophidium and cancer metabolism has been proposed but not yet been revealed. In the current study we provide clear evidence of the presence of CTPS cytoophidia in various human cancers and some non-cancerous tissues...
October 31, 2017: Experimental Cell Research
T S Bindu, Sameer Vyas, Niranjan Khandelwal, Vikas Bhatia, Sivashanmugam Dhandapani, Ajay Kumar, Chirag K Ahuja
PURPOSE: To evaluate utility, pattern, and extent of perfusion abnormalities in traumatic brain injury by using whole-brain computed tomography perfusion (CTP) and to assess co-relation of CTP data clinically with Glasgow outcome score (GOS). MATERIALS AND METHODS: Prospective analytic evaluation of the traumatic head injury patients who were immediately taken up for CTP was done. Patient's demographic, clinical, and radiological findings were tabulated and analyzed...
July 2017: Indian Journal of Radiology & Imaging
Thomas Martin, John Hoffman, Jeff R Alger, Michael McNitt-Gray, Danny Jj Wang
PURPOSE: CT Perfusion (CTP) is a widely used clinical imaging modality. However, CTP typically involves the use of substantial radiation dose (CTDIvol ≥~200mGy). The purpose of this study is to present a low dose CTP technique using a projection view-sharing reconstruction algorithm originally developed for dynamic MRI - "K-space Weighted Image Contrast" (KWIC). METHODS: The KWIC reconstruction is based on an angle bisection scheme. In KWIC, a Fourier transform was performed along each projection to form a "k-space" like CT data space, based on the central slice theorem...
October 27, 2017: Medical Physics
Jing Zhao, Lei Chen, Tuanjie Zhao, Junyi Gai, Peter Bozhkov
A soybean mutant displaying chicken toes-like leaves and petalody flowers was identified as being caused by a single recessive gene, termed ctp. Using heterozygous-inbred recombinants, this gene was fine-mapped to a 37-kb region harbouring three predicted genes on chromosome 5. The gene Glyma05g022400.1 was detected to have a 33-bp deletion in its first exon that was responsible for ctp. Validation for this gene was provided by the fact that the 33-bp deletion-derived marker I2 completely co-segregated with the phenotypes of 96 F10-derived residual heterozygous lines and 2200 fine-mapping individuals, and by the fact that the orthologue NbCTP in Nicotiana benthamiana also influenced leaf and flower development under virus-induced gene silencing...
October 25, 2017: Journal of Experimental Botany
Naseer Umer, Mujeeb Ullah Makki, Shagufta Kunwal Kiran, Nauman Arif Jadoon
BACKGROUND: Serum ferritin is marker for hepatic neco-inflammation and known 1 year mortality predictor in post-transplant patients. However, data on utility as early mortality predictor in patient of cirrhosis is scarce. We investigated whether ferritin can be used as one month mortality predictor in patients of decompensated cirrhosis. METHODS: The study cohort included 132 patients in whom predictors of mortality were studied. RESULTS: One hundred and thirty-two patients with 77 (58...
July 2017: Journal of Ayub Medical College, Abbottabad: JAMC
Chaan S Ng, Wei Wei, Cihan Duran, Payel Ghosh, Ella F Anderson, Adam G Chandler, James C Yao
OBJECTIVE: To assess the effects of bevacizumab and everolimus, individually and combined, on CT perfusion (CTp) parameters in liver metastases from neuroendocrine tumors (mNET) and normal liver. METHODS: This retrospective study comprised 27 evaluable patients with mNETs who had participated in a two-arm randomized clinical trial of mono-therapy with bevacizumab (Arm B) or everolimus (Arm E) for 3 weeks, followed by combination of both targeted agents. CTp was undertaken at baseline, 3 and 9 weeks, to evaluate blood flow (BF), blood volume (BV), mean transit time (MTT), permeability surface area product (PS), and hepatic arterial fraction (HAF) of mNET and normal liver, using a dual-input distributed parameter physiological model...
October 26, 2017: Abdominal Radiology
Maryam Ghavami, Emilio F Merino, Zhong-Ke Yao, Rubayet Elahi, Morgan E Simpson, Maria L Fernández-Murga, Joshua H Butler, Michael A Casasanta, Priscilla M Krai, Maxim M Totrov, Daniel J Slade, Paul R Carlier, Maria Belen Cassera
Malaria continues to be one of the deadliest diseases worldwide, and the emergence of drug resistance parasites is a constant threat. Plasmodium parasites utilize the methylerythritol phosphate (MEP) pathway to synthesize isopentenyl pyrophosphate (IPP) and dimethylallyl pyrophosphate (DMAPP), which are essential for parasite growth. Previously, we and others identified that the Malaria Box compound MMV008138 targets the apicoplast and that parasite growth inhibition by this compound can be reversed by supplementation of IPP...
November 7, 2017: ACS Infectious Diseases
Jolene Chisholm, Shashank Bhatt, Amélie Chaboureau, Sowmya Viswanathan
BACKGROUND AIMS: Cell therapy products (CTP) typically require full sterility, endotoxin and Mycoplasma testing before product release. Often this is not feasible with fresh cells, and sponsors may rely on rapid microbiological methods (RMM). RMM must be qualified in-house using the sponsor's facilities, equipment, consumables, cells and matrices to meet regulatory approval. Herein, we present a cost-effective strategy to conduct an in-house abbreviated qualification of a commercially available RMM kit to meet Health Canada regulatory requirements...
October 20, 2017: Cytotherapy
Syeda Umme Habiba Wahid
The bacterium Helicobacter pylori is a human gastric pathogen that can cause a wide range of diseases, including chronic gastritis, peptic ulcer and gastric carcinoma. It is classified as a definitive (class I) human carcinogen by the International Agency for Research on Cancer. Flagella-mediated motility is essential for H. pylori to initiate colonization and for the development of infection in human beings. Glycosylation of the H. pylori flagellum with pseudaminic acid (Pse; 5,7-diacetamido-3,5,7,9-tetradeoxy-l-glycero-l-manno-nonulosonic acid) is essential for flagella assembly and function...
2017: Advances and Applications in Bioinformatics and Chemistry: AABC
Yuichi Takahashi, Atsushi Sasahara, Kei Yamazaki, Mayuko Inazuka, Hidetoshi Kasuya
BACKGROUND: Delayed cerebral ischemia (DCI) is a serious complication following aneurysmal SAH (aSAH) and remains a leading cause of morbidity and mortality. We investigated whether data from CT perfusion (CTP) within 24 h after onset are associated with DCI and its outcome. METHODS: We retrospectively examined plain CT, CTP, and CT angiography (CTA) of aSAH patients on arrival. We measured the average mean transit time (aMTT) and compared it with several clinical factors, such as the age, WFNS grade, Fisher group, delayed cerebral infarction, cerebral vasospasm, and modified Rankin scale (mRS), at 1 month...
October 23, 2017: Acta Neurochirurgica
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