选矿工程矩形常压容器强度分析及优化设计

应用SolidWorks软件建模及有限元分析模块,对选矿工艺常用的矩形常压容器进行静力学分析。通过结果分析,得出了加强筋及耳座连接形式更具合理性的结论,有效的降低了容器重量。考察了选矿工艺中常见外载荷对容器强度的影响,为容器优化设计工作提供了依据。     

挂膜式生物反应器处理麦草制浆废液的研究

研究设计了一个生物接触反应器 ,以不锈钢丝为载体用白腐菌挂膜。在反应温度为32℃、水力停留时间为 1 2h、溶氧为 4～ 6mg/L、pH值为 4～ 5条件下 ,可使Na2 SO3法草浆废液的COD去除 70 .7% ,BOD去除 89.5 % ,木素去除 5 1 .9%。再经絮凝处理 ,出水可达GWPB2 -1 999国家标准     

Chemical cross-linking of the human immunodeficiency virus type 1 Tat protein to synthetic models of the RNA recognition sequence TAR containing site-specific trisubstituted pyrophosphate analogues

A chemical ligation procedure has been developed for the synthesis of oligoribonucleotides carrying a trisubstituted pyrophosphate (tsp) linkage in place of a single phosphodiester. Good yields of tsp were obtained when a single 2'-deoxynucleoside 5' to the tsp was used in the ligation reaction. A tsp linkage was found to be reasonably stable to hydrolysis but cleaved by treatment with ethylenediamine or lysine to give phosphoamidate adducts. A model human immunodeficiency virus type 1 (HIV-1) TAR RNA duplex containing an activated tsp was able to bind to HIV-1 Tat protein with only 3-fold reduced affinity and to a Tat peptide (residues 37-72) with identical affinity compared to that of an unmodified duplex. Tsps incorporated at sites previously identified as being in close proximity to Tat protein were able to cross-link to Tat peptide (37-72) to form a covalent phosphoamidate conjugate. Endopeptidase cleavage followed by MALDI-TOF (matrix-assisted laser desorption ionization time of flight) mass spectrometric analysis provided strong evidence that a TAR duplex containing a tsp replacing the phosphate at 38-39 had reacted specifically with Lys51 in the basic region of Tat peptide (37-72). The new chemical cross-linking method may be generally useful for identifying lysines in close proximity to phosphates in basic RNA-binding domains of proteins.     

Comparative linkage mapping of genes on sheep chromosome 3 provides evidence of chromosomal rearrangements in the evolution of the Bovidae

Three genes--parathyroid hormone-like hormone (PTHLH), insulin-like growth factor 1 (IGF 1), and retinoic acid receptor gamma (RARG)--have been mapped to sheep (Ovis aries) chromosome 3 (OAR 3). The order and genetic distances between loci on OAR 3 are similar to those on cattle (Bos taurus) chromosome 5, as expected from their close evolutionary relationship. The OAR 3 linkage map shows conserved synteny with human chromosome 12, but there are at least two rearrangements in gene order between the species.     

Unilateral enophthalmos secondary to acquired hemilipodystrophy

PURPOSE: To report a case of acquired hemilipodystrophy with ipsilateral enophthalmos. METHODS: Case report. We examined a 25-year-old woman who developed progressive unilateral enophthalmos secondary to fat atrophy on the corresponding left side of her body. RESULTS: Computed tomography confirmed that atrophy in the left orbit, loss of fat in the preorbital area, and partial loss of eyebrow cilia on the same side were present. A biopsy specimen from the left arm was consistent with lipodystrophy. The systemic examination and laboratory values were within normal limits. CONCLUSION: Although it is a rare condition, lipodystrophy may be a cause of unilateral enophthalmos.