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您的检索式：作者名="DENGChenglong"
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| 1 | Biomineralization and magnetism of bacterial magnetosomes显示文摘Magnetosomes of magnetotactic bacteria are of great interest in understanding biomineralization and possi- ble links between organisms and geomagnetic field. Fossil magnetosomes are ubiquitous in marine and lake sediments and may significantly contribute to magnetic signals. In this review, we firstly introduce some characteristics of magneto- tactic bacteria, followed by considering recent progress in magnetosome formation, magnetic measurements, and iden- tification of bacterial magnetites in bulk sediments as well as their paleoenvironmental implications. Finally, we briefly discuss potential future breakthroughs in magnetosome studies and its applications. | PANYongxin DENGChenglong LIUQingsong NikolaiPetersen ZHURixiang | 2004 | Chinese Science Bulletin2004，49，24： | 13 |
| 2 | Paleoclimatic significance of mineral magnetic properties of loess sediments in northeastern Qinghai- Tibetan Plateau显示文摘Loess deposit in the northeastern Qinghai-Tibetan Plateau offers an excellent record of climate and environment changes in this region. We have conducted multiparameter mineral magnetic analyses of samples of loess deposits from the Dongchuan, Lalakou and Panzishan sections. The methods used include magnetic susceptibility, frequency-dependent susceptibility, temperature-dependent susceptibility, isothermal remanent magnetization acquisition, and magnetic hysteresis loops. The results reveal that magnetite is the dominant contributor to magnetic susceptibility. Maghemite and hematite is also present in the loess layers and paleosol horizons. The higher concentration of maghemite in paleosols suggests that the formation of maghemite occurred during in situ pedogenesis, which plays an important role in the enhancement of the magnetic susceptibility. Similar to that in the Chinese Loess Plateau lying to the east of the Liupan Mountains, magnetic granulometry in the studied loess and paleosols is predominantly pseudo-single-domain (PSD). However, the mean grain-size of the ferrimagnetic minerals in loess is evidently coarser (larger PSD and multidomain-like) than in paleosols (mainly PSD). The magnetic susceptibility of loess and paleosols is positively correlated with the content of ultrafine magnetite/maghemite grains, and hence with the intensity of in situ pedogenesis. Therefore, the enhanced magnetic susceptibility in the studied loess-paleosol sequences can be interpreted as being due to climatically induced in situ pedogenesis. | WANGXiaoyong LUHuayu LIZhen DENGChenglong TANHongbing | 2003 | Chinese Science Bulletin2003，48，19： | 9 |
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