脱硫催化剂的酸法制备及性能研究

对用酸法进行催化剂制备，酸法制备的最佳镁铝比，分散介质的优化，引入对脱催化剂的氧化性能和还原性能的影响。以及实验室的还原温度等诸方面进行了研究。     

Large-scale traveling ionospheric disturbances observed by GPS receivers in Antarctica

The paper examines the propagation direction and velocity of largescale traveling ionospheric disturbances (LSTIDs) during extreme geomagnetic storms in the 23rd solar cycle (e.g., October 2003 and No-vember 2003 storms) using GPS observations. In the analysis, the time delay between the vertical total electron content (VTEC) structures at Scott Base, McMurdo, Davis and Casey GPS stations and the distance between these stations were the main parameters in the determination of LSTIDs propagation speed and di...     

New HLA DNA polymorphisms associated with autoimmune diseases

Certain class II determinants of the human histocompatibility locus antigens (HLA) have been implicated in the aetiology of several autoimmune diseases, including rheumatoid arthritis (RA) and insulin-dependent diabetes mellitus (IDDM). HLA-Dw4 was the first HLA determinant found to be significantly increased in RA patients compared with controls, while Dw4 and Dw3 were found to be significantly increased in IDDM patients. When the HLA-DR system was defined, RA patients were found to have an increased frequency of DR4 and IDDM patients an increased incidence of both DR4 and DR3 compared with controls. As the HLA-Dw specificities are narrower than the serologically defined DR specificities, it was of specific interest to the present study that Dw4, Dw10, Dw13, Dw14, Dw15 and DKT2 are included in DR4. We describe here new restriction fragment length polymorphisms (RFLPs) and, together with the newly described serologically defined DQ specificity TA10, test their prevalence and associations in controls and diseased patients. We find that the newly characterized DNA bands are present at a much higher frequency in RA and IDDM patients than in controls. These findings may lead to a greater understanding of the pathogenesis of such diseases.     

The effect of X-rays and EMS on the behavior of the transposing element,TE98, inDrosophila melanogaster

Summary The sensitivity of TE98 (carryingw ^+R andrst ⁺) to X-rays does not differ significantly from the mutability ofcurled andkarmoisin loci. In addition no spontaneous mutants of TE98 were recovered, indicating its extreme stability. On the effect of EMS nowhite mutants were found supporting the view that thew ⁺ gene of TE98 is duplicated.     

Late middle Eocene epoch of Libya yields earliest known radiation of African anthropoids

Reconstructing the early evolutionary history of anthropoid primates is hindered by a lack of consensus on both the timing and biogeography of anthropoid origins. Some prefer an ancient (Cretaceous) origin for anthropoids in Africa or some other Gondwanan landmass, whereas others advocate a more recent (early Cenozoic) origin for anthropoids in Asia, with subsequent dispersal of one or more early anthropoid taxa to Africa. The oldest undoubted African anthropoid primates described so far are three species of the parapithecid Biretia from the late middle Eocene Bir El Ater locality of Algeria and the late Eocene BQ-2 site in the Fayum region of northern Egypt. Here we report the discovery of the oldest known diverse assemblage of African anthropoids from the late middle Eocene Dur At-Talah escarpment in central Libya. The primate assemblage from Dur At-Talah includes diminutive species pertaining to three higher-level anthropoid clades (Afrotarsiidae, Parapithecidae and Oligopithecidae) as well as a small species of the early strepsirhine primate Karanisia. The high taxonomic diversity of anthropoids at Dur At-Talah indicates either a much longer interval of anthropoid evolution in Africa than is currently documented in the fossil record or the nearly synchronous colonization of Africa by multiple anthropoid clades at some time during the middle Eocene epoch.     

The effect of X-rays and EMS on the behavior of the transposing element, TE98, in Drosophila melanogaster

The sensitivity of TE98 (carrying w+R and rst+) to X-rays does not differ significantly from the mutability of curled and karmoisin loci. In addition no spontaneous mutants of TE98 were recovered, indicating its extreme stability. On the effect of EMS no white mutants were found supporting the view that the w+ gene of TE98 is duplicated.