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Unsteady flow of Bingham fluid in a two dimensional elastic domain
Mosbah Kaddour,Farid Messelmi,Saf Salim 대한수학회 2024 대한수학회논문집 Vol.39 No.2
The main goal of this work is to study an initial boundary value problem relating to the unsteady flow of a rigid, viscoplastic, and incompressible Bingham fluid in an elastic bounded domain of $\mathbb{R}^{2}$. By using the approximation sequences of the Faedo-Galerkin method together with the regularization techniques, we obtain the results of the existence and uniqueness of local solutions.
Mohammad Hasan Namazi,Habibollah Saadat,Morteza Saf,Hossein Vakili,Saeed Alipourparsa,Mohammadreza Bozorgmanesh,Habib Haybar 대한심장학회 2014 Korean Circulation Journal Vol.44 No.4
Background and Objectives: The aim of this study was to examine the hypothesis that pentraxin 3 (PTX3) can have a diagnostic value for predicting anatomical complexity of coronary artery stenosis as measured by the Synergy between PCI with Taxus and Cardiac Surgery (SYNTAX) score. Subjects and Methods: We investigated the association of systemic arterial PTX3 with SYNTAX score among 500 patients with ischemic heart disease assigned to medical treatment (251), percutaneous coronary intervention (PCI) (197), or coronary artery bypass graft (CABG) (52). Results: The clinical judgment of the cardiologists was near-perfectly concordant with the SYNTAX score. Mean {99% confidence intervals (CIs)} SYNTAX scores were 5.8 (5.1–6.6), 18.4 (17.1–19.8), and 33.2 (32.8–33.6) in patients assigned to medical therapy, PCI, and CABG, respectively. The AROC (95% CIs) for discriminating between patients with and without a high SYNTAX score (>23) was 0.920 (0.895–0.946) for systemic arterial levels of PTX3. As the systemic arterial level of PTX3 increased, the SYNTAX scores also increased almost in a curvilinear fashion, with the value corresponding to the SYNTAX score of 23 being 0.29 ng · dL-1. This cutpoint achieved a sensitivity of 0.66 (0.57– 0.74), a specificity of 0.94 (0.91–0.96), a positive predictive value of 0.79 (0.70–0.87), and a negative predictive value of 0.89 (0.85–0.92). Conclusion: We observed that systemic arterial levels of PTX3 were associated with the SYNTAX score in a curvilinear fashion. The discriminatory power of systemic arterial levels of PTX3 for a high SYNTAX score was excellent. The interesting finding of this study was the near perfect concordance between the decisions made by the cardiologists based on their clinical judgment and the SYNTAX score. The systemic arterial PTX3 level of 0.29 ng · dL-1 was highly specific for diagnosing complex coronary artery stenosis.
The antiprotozoal potencies of newly prepared 3-azabicyclo[3.2.2]nonanes
Sarfraz Ahmad,Werner Seebacher,Johanna Faist,Marcel Kaiser,Reto Brun,Robert Saf,Robert Weis 대한약학회 2016 Archives of Pharmacal Research Vol.39 No.10
3-Azabicyclo[3.2.2]nonanes are already reported as antiprotozoal agents. Structural variations were performed by attachment of several basic side chains, being part of drugs in use, to the ring nitrogen. The structures of the new compounds were established using one and two dimensional NMR measurements. All compounds were investigated for their antiplasmodial and antitrypanosomal activities against Plasmodium falciparum K1 (multiresistant) and Trypanosoma brucei rhodesiense. Their cytotoxicity was assessed against L6 cells. The results are compared to the activities of formerly synthesized compounds. Structure–activity relationships are discussed
Robert Weis,Heinrich Berger,Marcel Kaiser,Reto Brun,Robert Saf,Werner Seebacher 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.6
New alkenes, aziridines, and diamines were prepared from antiprotozoal 4-dialkylaminobicyclo[ 2.2.2]octan-2-imines to investigate the influence of several functional groups in position 2 of the ring skeleton on the antitrypanosomal and antiplasmodial activities. They were synthesized from 4-dialkylaminobicyclo[2.2.2]octan-2-imines and tested for their activities against Trypanosoma b. rhodesiense and Plasmodium falciparum K1 (resistant to chloroquine and pyrimethamine) using in vitro microplate assays. 4-Aminobicyclo[2.2.2]oct-2-enes and 3-azatricyclo[ 3.2.2.02,4]nonylamines exhibit similar antiprotozoal activities as 4-aminobicyclo[2.2.2] octanes. 4-Aminobicyclo[2.2.2]oct-2-ylamines and their N-benzyl derivatives showed decreased antiplasmodial but enhanced antitrypanosomal (IC50 = 0.22-0.41 μM) activities compared to their parent oximes and to formerly synthesized 4-amino-2-azabicyclo[3.2.2]nonanes. Some of the 4-aminobicyclo[2.2.2]oct-2-ylamines exhibit moderate in vivo activity in mice against Trypanosoma brucei brucei.
Weis, Robert,Berger, Heinrich,Kaiser, Marcel,Brun, Reto,Saf, Robert,Seebacher, Werner 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.6
New alkenes, aziridines, and diamines were prepared from antiprotozoal 4-dialkylaminobicyclo[2.2.2]octan-2-imines to investigate the influence of several functional groups in position 2 of the ring skeleton on the antitrypanosomal and antiplasmodial activities. They were synthesized from 4-dialkylaminobicyclo[2.2.2]octan-2-imines and tested for their activities against Trypanosoma b. rhodesiense and Plasmodium falciparum $K_1$ (resistant to chloroquine and pyrimethamine) using in vitro microplate assays. 4-Aminobicyclo[2.2.2]oct-2-enes and 3-azatricyclo[$3.2.2.0^{2,4}$]nonylamines exhibit similar antiprotozoal activities as 4-aminobicyclo[2.2.2] octanes. 4-Aminobicyclo[2.2.2]oct-2-ylamines and their N-benzyl derivatives showed decreased antiplasmodial but enhanced antitrypanosomal ($IC_{50}\;=\;0.22-0.41\;{\mu}M$) activities compared to their parent oximes and to formerly synthesized 4-amino-2-azabicyclo[3.2.2]nonanes. Some of the 4-aminobicyclo[2.2.2]oct-2-ylamines exhibit moderate in vivo activity in mice against Trypanosoma brucei brucei.
Synthesis and antiprotozoal activities of new 3-azabicyclo[3.2.2]nonanes
Sarfraz Ahmad,Werner Seebacher,Volker Wolkinger,Armin Presser,Johanna Faist,Marcel Kaiser,Reto Brun,Robert Saf,Robert Weis 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.8
Some antimalarial agents in use typically bear basic side chains as ligands. Such ligands were attached to the amino substituent of a bridgehead atom of already antiprotozoal active 3-azabicyclo[3.2.2]nonanes. Structure verification was done by NMR measurements. The new compounds were tested for their antiplasmodial and antitrypanosomal activities against Plasmodium falciparum K1 (multiresistant) and Trypanosoma brucei rhodesiense as well as for their cytotoxicity against L6 cells. Theiractivities are compared to those of already prepared compounds and structure–activity relationships are discussed.