Fluoro-Green and Fluoro-Red: two new fluorescent retrograde tracers with a number of unique properties

A sample of 443 Pakistani infants from four different socioeconomic areas was followed longitudinally study the emergence of the primary teeth. The mean ages of emergence of the primary teeth, without regard what kind of tooth and dental ages of the primary teeth were calculated. The subjects showed no sexual dimorphism in the emergence times of the primary teeth. The children from poor areas. were ahead by statistically significant differences from upper middle class, for emergence of the primary teeth 17-20. On comparison with Swedish standards (H?gg & Taranger, 1985) Pakistani children are delayed, by a statistically significant difference, in the emergence of primary teeth 1-16, however, they were at par in the emergence of 17-20 primary teeth.     

奥氏体—贝氏体钢的显微组织和力学性能

本文研究了一种高碳含硅低合金钢经等温处理获得的新型奥氏体-贝氏体双相组织特征,并将其与常规类型组织进行了比较。分析了等温转变温度对组织及力学性能的影响。提示了该新型双相组织超高强度钢的强化机理。     

An experimental study on the relationship between BMP's activity and its carrier

To find out the relationship between human bone morphogenetic protein's activity and its carrier and to document the clinical application of BMP, we investigated six kinds of BMP carrier's influence upon hBMP's osteogenic activity with small sample size at first. Then three kinds of carriers selected from the six, added with the seventh carrier, were investigated with large sample size. The result showed that the compound of hBMP and hDDBM had best osteogenic ability. The human bone matrix had been formerly demineralized and extracted without hBMP. The hDDBM showed porous structure under SEM, its mean pore's diameter was 127 +/- 34 microns. It was demonstrated that the function of demineralized bone matrix extracted without BMP (i.e. DDBM) was related not only to its pore's diameter, but to the fibrolike matter in it as well. With the method of BMP bioassay, BMP was composited with carrier, then the compound was injected into the calf of mouse. This made BMP's bioassay become simple and reliable.     

镀铁工艺过程的自动控制

“镀铁氮化”是修复钢件工艺中的后起之秀，它的推广应用，将会给我们带来巨大的社会效益和经济效益。本文仅就其关键设备－供电系统的全面改进作了详尽的叙述。     

Experimental and theoretical study of the turn-off behavior of field-controlled thyristors (FCTh's)

Contents The turn-off behavior of FCTh's with surface-gates is studied. The devices investigated in this paper exhibit short turn-off times of less than 300 ns. The anode current, gate voltage and anode voltage are measured under resistive and inductive load. Analytical models are developed to describe the turn-off transients of the FCTh's. Studies of the storage phase including the time-dependent gate current and the tail period including the recombination in thep ⁺-anode region have been perfomed by applying the new models.

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Experimentelle und theoretische Untersuchung des Abschaltverhaltens von feldgesteuerten Thyristoren (FCTh's)

Übersicht Es wird das Abschaltverhalten von FCTh's mit Oberflächen-Gates untersucht. Die verwendeten Bauelemente weisen Abschaltzeiten von weniger als 300 ns auf. Gemessen werden die transienten Verläufe von Anodenstrom, Gatestrom und Anodenspannung bei ohmscher und induktiver Last. Zur Beschreibung des Abschaltverhaltens werden neue analytische Modelle erstellt. Berechnungen der Abschaltverzugsphase unter Berücksichtigung transienter Gatestromverläufe und der Tailphase unter Berücksichtigung der Rekombination in derp ⁺-Anodenzone werden durchgeführt.

     

全国统一的建筑工程预(结)算数据处理系统

利用我国高速信息公路，设计了一个全国统一的建筑工程预（结）算和数据处理系统，该系统可以支持网络结点的局部应用和分布式数据库的全局应用。     

试论国有石油批发企业的规模经营

结合当前的实际情况,论述了石油批发企业规模经营的必要性,并对拓展规模经营中应注意的一些问题,提出了看法和意见。     

In vitro suppression of the normal mitogenic T lymphocyte response by steady state sickle cell disease sera

This study is part of a long term evaluation of sickle cell disease (SCD) as a paradigm for immunosuppression. Serum was obtained from 43 SCD patients during the steady (healthy) state. Peripheral blood mononuclear cells (PBMC), separated by density gradient were obtained from 8 normal healthy donors. PBMC were utilized in assays directly or as a source for obtaining, total T (CD3) and helper T (CD4) cell populations separated by specific T cell columns. Standard in vitro phytohemagglutinin (PHA) stimulation of lymphocyte cultures was done with culture media containing 10% SCD serum, as compared to normal pooled O, Rh+ (O+) serum. Mitogenic responses were expressed as mean counts per minute (cpm) and stimulation index of triplicate cultures. Results revealed PHA responses were positive in all experiments when a standard stimulation index of 10 or greater was used as a test parameter for comparison. Positive results were demonstrated in 43/43 (100%) of triplicate cultures regardless of serum type in all experiments. Conversely, by using mean cpm as the test criterion, suppression of PHA response was shown in SCD serum supplemented cells as follow; 36/43 (84%) of PBMC, 35/43 (81%) of CD3 and 37/43 (86%) of CD4 cultures. The degree of suppression ranged from > 10% to 98% in individual experiments, as compared to O+ serum. Inhibitors of normal T lymphocyte in vitro PHA response appear to be present in a significant percentage of SCD sera even during the healthy state of disease. Type 2 cytokines which suppress cell mediated immunity would seem to be the most likely inhibitory agents.