The Chinese mainland is regarded as the best area for studying the continental crustal movement and dynamics. In the past,
based on the ground surface observation, it was very difficult to study the movement of the intraplate blocks within a range
of larger space and a time scale of several years quantitatively. In this paper, a method of calculating the Euler vectors
of present-time motion among blocks by using Cardan angles has been given completely based on two periods of GPS repetition
measurement data of the National Ascending Plan of China (NAPC) — the study and application of current crustal movement and
geodynamics in 1994 and 1996. A present-time blocks movement model on the Chinese mainland (PBMC-1), which describes the motion
of seven blocks—Tibet, Chuan-Dian, Gan-Qing, Xinjiang, South China, North China and Heilongjiang block, is established preliminarily.
The velocity field of the relative motion among the intraplate blocks and boundary motion in the Chinese mainland are firstly
given within several years time scale. It is shown by the results calculated with the model that the velocity-rate of each
block is reduced gradually from the south to north and from the west to east, and the motion direction changes gradually from
NNE to E, even SEE or SE. The collision of Indian plate plays a leading role in the movement of the intraplate blocks in the
Chinese mainland, while the motion manner and velocity-rate of block boundary zone (fracture zone) depend on the motion of
every block again. The present-time motion of a time scale of several years computed with the model is not only largely consistent
with the average motion of a time scale of several million years derived from geology, but also very coincident with the results
of geophysical and astronomic observation. It is shown preliminarily that the observed results of space geodesy techniques
such as GPS etc. are capable of discovering the crustal movement at present.
This study is supported by the National Natural Science Foundation of China (NNSFC), National Ascending Plan of China (NAPC)
and Chinese Joint Seismological Science Foundation (CJSSF). 相似文献
After being degreased with acetone, the female gonad ofChlamys (Azumapecten) farreri was extracted with water, and then subjected to DEAE—cellulose column chromatography and purified by Sephadex G-100 chromatography
to obtain a pure female gonad glycoprotein (FGGP). The IR spectra, electrophoresis and chemical analysis of FGGP indicated
that it was a kind of acid glycoprotein and that the content of total protein and sugar were 54.8% and 40%, respectively.
Pharmacological tests showed that FGGP could inhibit (inhibition rate of 40.87%) the growth of Sarcoma 180 of mice. 相似文献
The genes coding for the α-and β-subunit of allophycocyanin (apcA andapcB) from the cyanophyteSpirulina maxima were cloned and sequenced. The results revealed 44.4% of nucleotide sequence similarity and 30.4% of similarity of deduced amino acid sequence between them. The amino acid sequence identities betweenS. maxima andS. platensis are 99.4% for α subunit and 100% for β subunit.
Transposable elements in cyanobacteria are briefly reviewed. Evidence is presented to show that transposable elements inSpirulina platensis is actually reflected on the phenotype change, i e., helical to straight filaments. Transposition intermediates of DNA were isolated from the extrachromosome and the transposition was related to helical variations inSpirulina. Uses of transposable elements for microalgal recombination are discussed based on the transposition mechanism.