ABSTRACT
It has long been established that plastic flow in the asthenosphere interacts constantly with the overlying lithosphere and plays a pivotal role in controlling the occurrence of geohazards such as earthquakes and volcanic eruptions. Unfortunately, accurately characterizing the direction and lateral extents of the mantle flow field is notoriously difficult, especially in oceanic areas where deployment of ocean bottom seismometers (OBSs) is expensive and thus rare. In this study, by applying shear wave splitting analyses to a dataset recorded by an OBS array that we deployed between mid-2019 and mid-2020 in the South China Sea (SCS), we show that the dominant mantle flow field has a NNW-SSE orientation, which can be attributed to mantle flow extruded from the Tibetan Plateau by the ongoing Indian-Eurasian collision. In addition, the results suggest that E-W oriented flow fields observed in South China and the Indochina Peninsula do not extend to the central SCS.
ABSTRACT
RNA targeting the murine vascular endothelial growth factor receptor 2 (VEGFR2) gene was designed and validated for efficient and robust silencing in vitro and was delivered by polyethylenimines (PEI) in vivo to investigate the antitumor effect on non-small cell lung cancer (NSCLC) xenografts. The following dosage regimens were tested for their tumor inhibitory effect in vivo: VEGFR2 siRNA, epidermal growth factor receptor (EGFR) siRNA, VEGFR2 siRNA+EGFR siRNA, cisplatin alone and VEGFR2 siRNA+ EGFR siRNA+cisplatin. Targeted silencing of both VEGFR2 and EGFR expression by siRNA, combined with low-dose cisplatin, was found to effectively inhibit tumor growth and extend the survival time of mice bearing the NSCLC xenografts. These results suggest that combination therapy using siRNAs and chemotherapy agents might offer a novel strategy for cancer treatment in the future.
Subject(s)
Apoptosis , Carcinoma, Non-Small-Cell Lung/pathology , Cisplatin/pharmacology , ErbB Receptors/antagonists & inhibitors , Lung Neoplasms/pathology , RNA, Small Interfering/genetics , Vascular Endothelial Growth Factor Receptor-2/antagonists & inhibitors , Animals , Antineoplastic Agents/pharmacology , Blotting, Western , Carcinoma, Non-Small-Cell Lung/metabolism , Carcinoma, Non-Small-Cell Lung/therapy , Cell Proliferation , Combined Modality Therapy , ErbB Receptors/genetics , ErbB Receptors/metabolism , Humans , Lung Neoplasms/metabolism , Lung Neoplasms/therapy , Male , Mice , Mice, Inbred BALB C , Mice, Nude , RNA, Messenger/genetics , Real-Time Polymerase Chain Reaction , Reverse Transcriptase Polymerase Chain Reaction , Tumor Cells, Cultured , Vascular Endothelial Growth Factor Receptor-2/genetics , Vascular Endothelial Growth Factor Receptor-2/metabolismABSTRACT
OBJECTIVE: To establish a method for analyzing the content of total polyphenols in leaves of Jatropha curcas. L. METHODS: Gallic acid was used as reference substance, the content of total polyphenols was analyzed Folin-Ciocalteu chromatometry. RESULTS: There was a good linearity for gallic acid in the range of 0.002-0.010 g.L(-1). The content of total polyphenols in the leaves of Jatropha curcas. L was approximately 6.74% with RSD 0.75%. The sample solution was stable during 10-90 min with RSD 0.28%. The precision RSD was 0.23% and the average recovery 99.85% (n=5). CONCLUSION: This method is simple, fast and reproducible.
