石油加工中生物脱硫技术的进展

文中对石油加工过程中原料及其产品的生物脱硫工艺技术研究和应用的现状进行了分析和展望,并提出了当今世界生物技术在炼油工业中的发展前景.     

As,Sb,Sn对30CrMnSiA钢力学性能的影响

在３０ＣｒＭｎＳｉＡ钢中加入不同量的Ａｓ，Ｓｂ，Ｓｎ元素，研究了这些元素单独存在及复合存在时对钢的强度，塑性，冲击韧度及韧脆转变温度的影响规律，并用扫描电镜及俄歇能谱分析了Ａｓ，Ｓｂ，Ｓｎ导致晶界脆化的机理。     

Anatomical observation on the external nasal arteries

BACKGROUND: We report experience with patients presenting with a specific combination of symptoms: unilateral sciatica, unilateral sensibility loss in the dermatomes S1 to S5 (hemi-saddle) and subjective micturation problems secondary to ruptured lumbar disc. Because of its similarities with a cauda equina syndrome, this combination of symptoms was thought to be a unilateral cauda equina syndrome and it was called hemi-cauda equina syndrome. Consequently, it was treated as an emergency. METHODS: Ten patients were evaluated. They compromised 2.3% of all patients undergoing lumbar discectomy. RESULTS: Outcome is good with only 10% persisting minor neurologic deficit (sensibility loss in dermatomes S3 to S5). With the exception of urinary retention or incontinence, duration of symptoms and signs does not seem to influence outcome. Comparing signs, symptoms and radiographic findings with those of a cauda equina syndrome which were recently and thoroughly studied, they were found to be more severe in cases of cauda equina syndrome. Especially, the good outcome, (apparently unrelated to the duration of symptoms in cases of hemi-cauda equina syndrome) contrasted with the treatment results of cauda equina syndrome. CONCLUSIONS: We defined the hemi-cauda equina syndrome from ruptured disc as a combination of unilateral leg pain, unilateral sensibility loss in dermatomes S1 to S5 and sphincter paralysis (proven urinary retention or incontinence). Motor deficit is not necessarily present. Emergency surgery is warranted. Patients presenting with micturation complaints other than urinary retention or incontinence do not suffer from a hemi-cauda equina syndrome.     

云纹图象计算机处理技术的进展及其应用

本文对１９８７年至今国内外光测力学条纹图，主要是云纹图象的计算机采集，处理和力学量提取技术的进展进行了回顾，包括利用通用图象处理程序，直接利用灰度，用付利叶变换对条纹图进行分析，引入相移技术提高灵敏度，利用采色编码提取力学量。以及建立在云纹图特点基础上的新的图象处理技术等；分析了它们各自的优缺点，适用范围和存在的问题，讨论了它们在科究和工程测试中的应用前景。     

横向光泵获得S_2紫外激光

用ＸｅＣｌ准分于激光器（３０８．１ｎｍ）横向泵浦Ｓ２激光器，又成功地实现了Ｓ２Ｂ－Ｘ态近ＵＶ波段的激光振荡。在波长３３０．９～３９０．０ｎｍ范围内观测到６条近ＵＶ激光输出。测量了有关的激光参数。     

Biological Effects of Flammulina Velutipes Richin RE on Chinese Kunming Mice

ＢｉｏｌｏｇｉｃａｌＥｆｆｅｃｔｓｏｆＦｌａｍｍｕｌｉｎａＶｅｌｕｔｉｐｅｓＲｉｃｈｉｎＲＥｏｎＣｈｉｎｅｓｅＫｕｎｍｉｎｇＭｉｃｅＬｉａｎｇＤｉｎｇｂａｎｇ（梁定邦）；ＣｕｉＤｅｆａｎｇ（崔德芳）；ＺｈａｎｇＪｉｎｔｏｎｇ（张金桐）（Ｄｅｐａｒｔｍ...     

非线性动态系统“黑箱”建模方法的研究

本文研究弱非线性动态系统“黑箱”建模的理论和方法，并简要给出根据此方法建模的结果。     

地基基础与上部结构共同作用和结构次生应力问题

本文考虑到上部结构与地基基础共同作用的事实,着重分析上部结构参与共同作用导致的内力重分布——次生应力问题。通过多个理论与实验的结果,对不同地基和基础条件下的次生应力进行了定量分析,探讨了造成次生应力的各种因素以及对建筑结构带来的危害。     

Correlation between vascular and cellular responses to atrial natriuretic peptide and to sodium nitroprusside

Atrial natriuretic peptide (ANP) and sodium nitroprusside (SNP) increase cGMP in vascular smooth muscle cells and act as vasodilators in some, but not all, blood vessels. In this present study, we attempted to correlate the ability of these two agents to dilate blood vessels with the ability to increase cGMP in cultured vascular smooth muscle cells. In the isolated guinea pig heart, SNP dose-dependently increased coronary flow while ANP was ineffective. In smooth muscle cells cultured from the coronary system, SNP increased intracellular cGMP in a dose-dependent manner while ANP had no effect on cGMP in these cells. In isolated guinea-pig thoracic aorta, precontracted with K+, both ANP and SNP produced relaxation and ANP was the more potent. In smooth muscle cells cultured from the aorta, ANP and SNP increased cGMP and the potency relationship was similar to the intact vessel. These results support the view that phenotypic properties of vascular smooth muscle cells can account for differences in the response of blood vessels to vasodilators.     

Sanger DNA-sequencing reactions performed in a solid-phase nanoreactor directly coupled to capillary gel electrophoresis

A miniaturized, solid-phase nanoreactor was developed to prepare Sanger DNA-sequencing ladders which was directly interfaced to a capillary gel electrophoresis system. A biotinylated fragment of the rat brain actin gene (1 kbp) was amplified by PCR and attached to the interior wall of an (aminoalkyl)silane-derivatized fused-silica capillary tube via a biotin/streptavidin/biotin linkage. Coverage of the capillary wall with the biotinylated DNA averaged 77 +/- 10%. Stability of the anchored template under pressure (33 nL/s) and electroosmotic flows (11.3 nL/s) were favorable, requiring rinsing for > 150 h to reduce the surface coverage by only 50%. In addition, the immobilized template was stable toward temperatures required for preparing sequencing ladders, even under cycling conditions. Standard Sanger dideoxynucleotide termination performed in a large-volume (approximately 8 microL) solid-phase reactor using the thermally stable polymerase enzymes Taq and Vent and the polymerases T7 and Bst with off-line slab gel electrophoresis and autoradiographic detection indicated that acceptable fragment generation was achieved only in the case of the thermally stable polymerases. Banding was not apparent for T7 and Bst since all reagents were inserted into the column in a single plug at the beginning of the reaction. A small volume reactor (volume approximately 62 nL) was then used to perform DNA polymerase reactions and was coupled directly to a capillary gel column for separation. The capillary reactor was placed inside a thermocycler to control the temperature during chain extension and was directly connected to the gel column via zero dead volume fused-silica connectors. The complementary DNA fragments generated (C-track only) in the reactor were denatured using heat and directly injected onto the gel-filled capillary for size separation with detection accomplished using near-IR laser-induced fluorescence. Extension and single-base separation resolution of the C-track, which was directly injected onto the gel column, was estimated to be > 450 bases from the primer annealing site with plate numbers ranging from 1 x 10(6) to 2 x 10(6)/m.