[Interpretation of the connotation of the colored drawing of Neijing Tu in the Museum of Chinese Medical History].

Neijing Tu(, Chart of Inner Landscape), collected by the Museum of Chinese Medical History, is a colored drawing which is used to guide Taoist internal alchemy training pattern. It belongs to the inheritance of the immortals in the Tao Yin(physical and breathing exercise) of traditional Chinese medicine in folk. It is the essence for nurturing vitality of the traditional Chinese medicine. Its core tenet is that one practices with both Shen(spirit) and Qi(pneuma) and makes both to fuse in perfect harmony way. The specific practice process includes four phases: refining Jing and converting it into Qi, refining Qi and converting it into Shen, extracting and then restoring Xu(void)from Shen, purifying Xu to fit Dao. This process contains the contents of the Secret Alchemy such as sub-Meridian Circle Vessel, overcoming the roadblock and entering Primary Meridian Circle Vessel, getting Yangshen (highest level spirit) and harmonizing the body and spirit. Its important value lies in being able to treat the disease which has not yet completely developed and the disease developed already.

Electrospray mass spectrometry: a study on some aqueous solutions of metal salts.

Aqueous metal salt solutions were used as models to probe the origin of the species observed in the electrospray mass spectrum. A qualitative or semiquantitative correlation among different species was observed between electrospray responses and calculated equilibrium aqueous solution concentrations. Quantitative correlations were obtained, however, when ions that were identical in charge and similar in type were selected for comparison. In these experiments the ions experienced very similar electrospray-related processes and their effects on the responses were canceled in a comparison of these ions. Consequently, the relative abundances of these ions in the electrospray mass spectrum closely matched the calculated relative abundances in aqueous solution. Our results suggest that the basic principle that determines ionic distribution in the electro spray mass spectrum in aqueous solution chemistry.

Chemical characteristics of aerosols at coastal station in Hong Kong. II. Environmental behavior of trace elements during the April 1995 to April 1996.

An one-year of sampling aerosol program was carried out during the period of April 1995 to April 1996 at coastal region, Cape D'Aguilar, in Hong Kong. The trace element composition of aerosol particles (TSP and PM10) were measured and analyzed by using the Instrumental Neutron Activation Analysis (INAA) and Inductive Couple Plasma-Mass Spectrometry (ICP-MS) techniques. The results showed that the polluted elements such as: V, Zn, As, Pb, Cd, Sb, I, Se, Bi, with high enrichment factor (E. F) values, are derived from anthropogenic sources, while Sc, Al, Fe, Mn, Sm, La, Sr are less than 10 in E. F, these elements are related the crust and soil. The concentration of the trace elements are present seasonal variation i.e. summer low and winter high, whereas the V or noncrustal V (V*) present summer high and winter low, this phenomenon might be explained by local or regional oil combustion sources. Use three type of elemental ratio, e.g. La/Sm, Mn*/V* and Bi/Al indicate that both TSP and PM10 of La/Sm ratios are mainly related to soil and dust, Mn*/V* are probably represent fossil combustion and Bi/Al are possibly associated with refuse incineration, ferromanganese alloys and aluminum production. The varimax rotation factor analysis for trace elements was performed. By means of the absolute principal component analysis (APCA) and multiple regression, the contribution of trace elements to possible sources and overall means of trace elements were estimated. The results showed that the present station is impacted by the anthropogenic species, although the quantities are different during the summertime and wintertime.

In situ formation of highly conducting covalent Au-C contacts for single-molecule junctions.

Charge transport across metal-molecule interfaces has an important role in organic electronics. Typically, chemical link groups such as thiols or amines are used to bind organic molecules to metal electrodes in single-molecule circuits, with these groups controlling both the physical structure and the electronic coupling at the interface. Direct metal-carbon coupling has been shown through C60, benzene and π-stacked benzene, but ideally the carbon backbone of the molecule should be covalently bonded to the electrode without intervening link groups. Here, we demonstrate a method to create junctions with such contacts. Trimethyl tin (SnMe(3))-terminated polymethylene chains are used to form single-molecule junctions with a break-junction technique. Gold atoms at the electrode displace the SnMe(3) linkers, leading to the formation of direct Au-C bonded single-molecule junctions with a conductance that is ∼100 times larger than analogous alkanes with most other terminations. The conductance of these Au-C bonded alkanes decreases exponentially with molecular length, with a decay constant of 0.97 per methylene, consistent with a non-resonant transport mechanism. Control experiments and ab initio calculations show that high conductances are achieved because a covalent Au-C sigma (σ) bond is formed. This offers a new method for making reproducible and highly conducting metal-organic contacts.