Seaweed Complex Preparation (SCP) is a clinical traditional Chinese medicine preparation which is composed of seven traditional Chinese herbs, and it has been used for treatment of lung cancer, liver cancer and digestive cancer. However, little information is available about the pharmacodynamic basis. The antitumor, immunomodulatory and free radical scavenging effects of SCP were evaluated in this study. Transplanted tumor in vivo method was used to determine the antitumor effect. The effects on splenocyte proliferation and phagocytosis of macrophages in tumor-bearing mice were measured by the MTT method and the phagocytizing cock red blood cell (CRBC) method respectively. The scavenging activities of SCP on DPPH and hydroxyl radicals in vitro were investigated. It was found that the medium-dose and high-dose of SCP could significantly inhibit the growth of transplanted hepatic tumor of murine hepatocarcinoma cell line H22, and promote proliferation of splenocytes and phagocytosis of macrophages. SCP possessed noticeable scavenging activities on DPPH and hydroxyl radicals. The antitumor effects of SCP might be achieved by improving immune system and scavenging free radicals, which is in accordance with the viewpoint of traditional Chinese medicine in promoting the body resistance and eliminating pathogenic factors for cancer treatment. 相似文献
The Galería de las Estatuas is a Mousterian site located within the Cueva Mayor-Cueva del Silo karstic system at the Sierra de Atapuerca (Burgos, Spain). This site is characterised by an important Upper Pleistocene stratigraphic sequence in which a large number of lithic artefacts exhibiting clear Mousterian affinities and a rich assemblage of faunal remains have been found.Additionally, this site has yielded a foot phalanx of a clear Neanderthal affinities and its sediment has yielded Neanderthal mitochondrial and nuclear DNA.Two test pits, GE-I and GE-II, have been excavated since 2008 which have been divided in 5 and 2 lithostratigraphical units, respectively. A minimum age of 45 ka cal BP for this site was obtained by radiocarbon dating in GE-II. This chronology was refined using single-grain Optically Stimulated Luminescence (OSL: 80–112 ka in GE-I and 70–79 ka in GE-II) and single-grain thermally transferred OSL (TT-OSL). Although in all case TT-OSL ages were systematically older than their single-grain counterparts. The detrital sequence is sealed by a flowstone whose base is dated to 53.7 ± 3.5 ka cal BP using U-series dating.In order to better constrain the age of this site, nine herbivorous teeth were collected from the whole sedimentary sequence to be dated by the ESR/U-series dating method though only seven provided modelled ages. Six of them were collected from levels 2 to 5 of the GE-I test pit while the last tooth was taken from level 2 of the GE-II test pit. Our results, ranging between 80 and 110 ka, are in agreement with those obtained by single grain TT-OSL and suggest that the sedimentological levels containing Mousterian lithic artefacts and faunal and human remains began to be deposited during the second part of the MIS5. These results fill a temporal gap in the chronology of the Atapuerca sites for which no contemporary MIS5 date was obtained until recently. 相似文献
The calcretes in the Thar desert occur in a variety of settings, including the piedmonts, sheetwash aggraded plains; and this
study adds calcretes in regolith and colluvio-alluvial plains to the group of settings in which calcretes occur in the region.
Field logs, morphological details and analytical data such as petrographic, cathodoluminescence and geochemical characteristics
are described along with a discussion on their implications. Sand dunes and sandy plains dating to < 20 ka have weakly developed
calcretes. The better-developed calcrete horizons occur in piedmonts, interdunes or in areas that have sufficient groundwater.
Deep sections in the region show phases of calcrete development in aeolian sand aggradation at ∼ 150, ∼ 100, ∼ 60 and 27–14
ka. The extensive sheetwash plains have mature calcretes and date to mid-Pleistocene. Our studies indicate that these calcretes
represent a hybrid process, where carbonate enrichment of the originally calcareous host occurred due to periodically raised
groundwaters, and its differentiation into nodules occurred under subaerial environment i.e., after recession of groundwater.
Deep sections also show a stack of discrete calcretes that developed in individual aggradation episodes with hiatuses as indicated
by ESR dating results. Nodules display a multiplicity of carbonate precipi tation events and internal reorganization of calcitic
groundmass. The process is accompanied by degradation and transformation of unstable minerals, particularly clays and with
a neosynthesis of palygorskite.
The ancient calcretes are dated from the beginning of the Quaternary to ∼ 600 ka and show more evolved morphologies marked
by brecciation, dissolution, laminar growth on brecciated surfaces, pisolites and several generations of re-cementation. Mica/chlorite
schists and such other rocks are particularly vulnerable to replacement by carbonate. In an extreme case, replacement of quartzose
sandstone was observed also. The presence of stretches of alluvio-colluvial plains in an area presently devoid of drainage
bespeaks of occasional high-energy fluvial regime, under a semi-arid climate. The mid-Pleistocene period saw a shift towards
more arid climate and this facilitated sheetwash aggradation. Finally, during the late Pleistocene, aggradation of aeolian
sands indicated a progressively drier climate. However, this does not find its reflection in stable isotope data. The amount
of carbonate in the form of calcretes is substantial. The present studies indicate that aeolian dust or rainwater are minor
contributors to the carbonate budget. A more important source was provided by the pre-existing calcretes in the sheetwash
aggraded plains and detrital carbonate in the aeolian sediments. The original source of carbonate in the region, however,
remains unresolved and will need further investigations. Electron spin resonance protocols for the dating of calcretes were
developed as a part of this study and the results accorded well with geological reasoning 相似文献