1,721,119 research outputs found
Comparison of two Drain Modulator for Multi-Mode Multi-Band Transmitters employing EER Technique
No full textThis paper compares two types of Amplitude Modulator and their applicability in High Power Ampli ̄ers (HPA) with Envelope Elimination and Restoration (EER) technique and Low Voltage supply for the use of multi-mode multi-band terminals: a very °exible terminal plays a key role in the worldwide telecommunications coverage. First of all a HPA with drain e±ciency of 88% that operates at 1.95 GHz was tested with a typical drain modulator, then is shown that a di®erent modulator can achieve a better drain e±ciency but it is going to operate with lower values of modulation index (ma)
Transverse myelitis associated with Mycoplasma pneumoniae pneumonitis: a report of two cases
No full textThe authors report two cases of transverse myelitis due to Mycoplasma pneumoniae occurring during a recent acute infection due to Epstein-Barr virus (EBV). The clinical picture included weakness of the legs, bladder dysfunction, fever, headache and in one case, a mild confusional state. Magnetic Resonance Imaging (MRI) revealed a segmental edema of the lumbar tract and cerebro-spinal fluid analysis showed a mild pleocytosis and an increased level of proteins with a blood-brain barrier damage. The diagnosis of acute infection due to Mycoplasma pneumoniae was made on serological criteria. The patients recovered completely after a 14-day course of an associated regimen with Ciprofloxacin (400 mg/day i.v.) plus prednisone (60 mg/day i.v.). The authors emphasise the immunological disorders in the combined infection with Mycoplasma pneumoniae and EBV, supposing that an infective mononucleosis may predispose to mycoplasmic transverse myelitis
Infection of rabbits with human immunodeficiency virus.
No full textAn important requirement for the development of a vaccine against the hu immunodeficiency virus (HIV-1)1, the causative agent of AIDS2, is a readily available animal model that would allow possible immunogens to be evalua The only species to have been infected with HIV-1 so far is the chimpanzee However, the scarcity of this animal and its designation as an endangered species8 place severe restrictions on its use as an animal model. Attempts to infect mice, rats, hamsters, guinea-pigs, musk shrews, and rabbits with HIV or infected cells have all been unsuccessful9. We now report that the intraperitoneal inoculation of rabbits with HIV-1 or chronically infected H cells consistently induces a persistent infection
Comparison of ELISA and indirect immunofluorescence in the detection of IgG and IgM antitoxoplasma antibodies
No full textWe have compared ELISA and IFA for the quantitation of IgG and IgM antitoxoplasma antibodies on whole sera and purified IgM fractions. In all the sera examined from adult patients the good correspondence of the two tests is expressed by a correlation coefficient of 0.77 (p = 0.001). However, we have observed that both IgM-ELISA and IgM-IFA performed on whole serum may lead either to false positive results due to presence of rheumatoid factors or to false negative results due to the competition with high level of IgG antibodies. The use of the simplified gel filtration method for separation of IgM fraction allowed the detection of IgM in 40 out of 75 adults patients by IgM IFA and in 39 by the same tests resulted negative if performed on whole serum. The separation of IgM fractions seems a necessary step for detecting IgM antibodies by IgM IFA in 12 of 14 newborns sera with clinical and serological evidence of congenital toxoplasmosis. The conventional IgM ELISA was constantly negative when performed on both whole sera or pure IgM IFA positive fractions of the same newborns
Ultrastructural aspects of the vascular connective tissue in epulis. I. Fibromatous epulis
No full textUltrastructural aspects of the vascular connective tissue in epulis. III. Plasmacellular epulis (in pregnancy)
No full textDetection of IgM antibodies by IgM-ISAGA and DS-IgM-ELISA performed on whole sera and IgM-fractions in acute acquired toxoplasmosis
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