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Biomedical subjects

X H Xu

Publications and source records attributed to X H Xu.

72 records · Page 4Linked to original sources
PubMed1984

Oligoclonal bands in CSF: twins with MS.

Oligoclonal bands ( OCBs ) were examined in CSF from 23 normal controls, 8 cases of inflammatory neurologic diseases, 24 cases of noninflammatory neurologic diseases, 27 sporadic cases of MS, and the 29 MS twin pairs, by isoelectric focusing followed by silver staining or western transblotting and immunoperoxidase staining. These methods are sensitive enough to detect as little as 25 ng of IgG. OCBs were detected in the CSF of 34 of 35 twins with clinical evidence of MS and in the CSF of 12 of 17 clinically normal twins. In some of these normal twins, the presence of OCBs in CSF antedated clinical manifestations of the disease.

Diseases in Twins↗
PubMedDate not supplied

Method for the control of NOx emissions in long-range space travel.

The wheat straw, an inedible biomass that can be continuously produced in a space vehicle has been used to produce activated carbon for effective control of NOx emissions from the incineration of wastes. The optimal carbonization temperature of wheat straw was found to be around 600 degrees C when a burnoff of 67% was observed. The BET surface area of the activated carbon produced from the wheat straw reached as high as 300 m2/g. The presence of oxygen in flue gas is essential for effective adsorption of NO by activated carbon. On the contrary, water vapor inhibits the adsorption efficiency of NO. Consequently, water vapor in flue gas should be removed by drying agents before adsorption to ensure high NO adsorption efficiency. All of the NO in the flue gas was removed for more than 2 h by the activated carbons when 10% oxygen was present and the ratio of carbon weight to the flue gas flow rate (W/F) was 30 g min/L, with a contact time of 10.2 s. All of NO was reduced to N2 by the activated carbon at 450 degrees C with a W/F ratio of 15 g min/L and a contact time of 5.1 s. Reduction of the adsorbed NO also regenerated the activated carbon, and the regenerated activated carbon exhibited an improved NO adsorption efficiency. However, the reduction of the adsorbed NO resulted in a loss of carbon which was determined to be about 0.99% of the activated carbon per cycle of regeneration. The sufficiency of the amount of wheat straw in providing the activated carbon based on a six-person crew, such as the mission planned for Mars, has been determined. This novel approach for the control of NOx emissions is sustainable in a closed system such as the case in space travel. It is simple to operate and is functional under microgravity environment.

Adsorption↗
PubMedDate not supplied

Vascular dementia, with special reference to its vascular and immunological events.

Vascular dementia (VaD) is an poorly defined entity; it relates to different vascular mechanisms and different changes in the brain and has different clinical manifestations with different etiologies. From the pathogenetic and therapeutic point of view, we tried to find some practical events that could help identify VaD. We combined critical review with our own clinical and laboratory experience and found that some vascular, nonvascular, and immunological components are involved in the pathogenesis and treatment of VaD. We concluded that although the definition, etiology, clinical manifestation, laboratory data, and treatment are still controversial, it is useful to find some common, key points in the pathogenesis and treatment of VaD.

Dementia, Vascular↗