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A patient with pheochromocytoma presented striking electrocardiographic changes mimicking ischemic heart disease at one time and acute pulmonary embolism at other times. Diffuse left ventricular hypokinesia was demonstrated in the presence of normal coronary arteries. Following removal of the pheochromocytoma, the electrocardiographic abnormalities disappeared. 相似文献
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NARESH K. SINHA ABHIJIT SEN ROGER H. Y. TO 《International journal of systems science》2013,44(4):373-382
Two digital methods are proposed for the solution of the time-domain approximation problem. Tho first method, based on a reeursivo algorithm for tho matrix pseudo-iriverso, determines the pulse transfer function of a discrete-timo system of a prescribed order providing the best fit in tho least squares sense at tho samplo points. Tho continuous-time system transfer function is then derived by using a simple transformation provided that tho sampling frequence oxeeeds tho Nyquist rate. Tho method is direct and computationally efficient. The second method is based on using an offieiont gradient search algorithm providing the best fit in the least pti sense at tho samplo points. A number of examples illustrato the methods 相似文献
115.
The effects of ginsenoside-Rh1 and Rh2 in the induction of nitric oxide (NO) synthesis by IFN-gamma plus LPS were investigated using murine peritoneal macrophages. The NO production from rIFN gamma plus LPS-treated macrophages was markedly reduced by ginsenoside-Rh1 or Rh2 in a dose dependent manner, but had no inhibitory effects by ginsenoside-Rb1, Rc or Re. In addition, treatment of the cells with ginsenoside-Rh2 6 hr before the stimulation with IFN-gamma plus LPS showed more inhibitory effect than the treatment with ginsenoside-Rh2 6 hr after or simultaneously with the stimulation with IFN-gamma plus LPS in the NO production. Ginsenoside-Rh2 also effectively inhibited IFN-gamma induced NO production when the cells were treated with IFN-gamma 6 hr after the treatment with ginsenoside-Rh2. Our findings suggest that this phenomenon might be caused by inhibition of priming signal such as IFN-gamma for the synergistic induction of NO synthesis. 相似文献
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CM Nguer TO Diallo A Diouf A Tall A Dieye R Perraut O Garraud 《Canadian Metallurgical Quarterly》1997,65(11):4873-4876
This study shows markedly different isotype distributions of antibodies to asexual blood stages of Plasmodium falciparum and to merozoite surface protein 1 in clinically immune Senegalese adults depending on the study site. The relationships between immunoglobulin M (IgM) and IgG and between IgG3 and IgG1 antibodies differed in settings where transmission is perennial compared to settings where it is seasonal. This suggests a role for antibody class and/or subclass production and utilization in the regulation of protective immunity to such antigens. 相似文献
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A Fasbender JH Lee RW Walters TO Moninger J Zabner MJ Welsh 《Canadian Metallurgical Quarterly》1998,102(1):184-193
The anti-SRYD monoclonal antibody (mAbSRYD) raised against the IASRYDQL synthetic octapeptide, the 250-257 sequence of the Leishmania major surface glycoprotein gp63 recognizes both SRYD-containing peptides and the whole cognate major surface protein on intact parasites. Two SRYD-containing peptides, which antigenically and functionally mimic the RGDS sequence of fibronectin and efficiently inhibit parasite attachment to the macrophage receptors, were studied by two-dimensional transferred nuclear Overhauser effect experiments in the presence of mAbSRYD. The antibody-bound IASRYDQL octapeptide solution conformation was determined on the basis of 55 interproton-distance restraints, derived from NMR measurements. Eighteen structures which were first generated using an approach combining distance geometry and molecular dynamics, converge by energy minimization toward a folded structure with an average rmsd from the experimental data of less than 0.05 nm for the overall backbone and 0.025 nm for the SRYD motif. A distorted gamma-turn was found, stabilized by the backbone-backbone D255-NH to R253-CO hydrogen bond, while the R253 and D255 side chains are pointing in opposite directions. This latter antibody-bound structure is compared with that of the free octapeptide in dimethylsulfoxide solution, and with the crystal structure of the RYD fragment in OPG2 Fab, an antireceptor antibody that mimics the RGD cell adhesion site. On this basis, a mechanism for IASRYDQL-receptor interaction is discussed. 相似文献
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Skeletal muscle biopsies from 18 children and 8 from their mothers were studied in mitochondrial myopathies. It is shown that by means of electron microscopy, histochemistry, and morphometry the correct diagnosis of mitochondrial insufficiency is quite possible. 相似文献
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