最新刊期
卷 35 ， 期 3 ， 1996
- 摘要：With computer analysis on Genbank database and cDNA sequencing methods, a novel intron-encoded SnoRNA, termed C1 SnoRNA, from rice(Oryza sativa) was identified. The RNA possesse the structural feature (boxC, boxD and a terminal stem)typic of SnoRNA, as well as with a 12 nt complementary to a conserved sequence of rice 18s rRNA, which implies a possible function of C1 SnoRNA in 18s rRNA methylation. The gene coding for C1 SnoRNA is nested in the first intron of rice Hsp70 gene. This is the first report on intron-encoded SnoRNA characterized from rice and plant.
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发布时间：2023-12-11 - 摘要：This paper deals with two new species of Plasodium found in two species of snake (Natrix stolata, Bungarus multicinctus) from the "new star" farm of Hainan Province, P. R. China.Plasmodium (Ophidiella) natrixi, sp. nov.This new species was found from a snake (Natrix stolata) in the August of 1994, Hainan province. The duration of schizogony in the blood was unknown and develop unsynchronous. the youngest forms can be found in any position of the erythrocyte, it tends to be round or oval and one pigment granule appears at the nucleus sides of the parasite. the cytoplasm of erythrocyte infected by the late stages is pale. Four to twelve merozoites are produced in a mature schizont with a little cytoplasm. One or two dark brown pigment granules appear in the cytoplasm. Both microand macrogametocytes are the spheral form or elongated.Type host: Natrix stolata Location in host: the erythrocytes Locality ; the "new star "farm(18°90′N, 110°E)in Hainan province Plasmodium (Ophidiella) multicincti, sp. nov.This new species was found from anther snake (Bungarus multicinctus)in the third area of same farm, in the July 29, 1994. The distinctive characters of the parasite is:①the erythrocytes infected the asexual and sexual form are fragile, and a lot of these schizonts or gametocytes are free in the plasma. ②one end of the asexual and sexual bodies can be found in the erythrocyte, while another is by apparently free and outside the host cell. ③ six to twelve merozoites were seen in a mature schizont. ④ the pigment of macrogametocytes clumps into a linear form, and they are distributed along edge of the parasite when they are found in the erythrocyte, the number of the pigment is not distinguished, the parasites are free in the plasma, more than 20 pigment granules are scattered throughout the cytoplasm.Type host: Bungarus multicinctus Location in host:the erythrocytes Locality: the third area of "new star" farm(18°90′ N, 110°E)in Hainan关键词： Plasmodium natrixi;Plasmadium multicincti
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发布时间：2023-12-11 - 摘要：According to characters of the momentum of ovary, the cell - number of ovary, the leave shape, the flower-parts and the chemical composition, essentially by caffeine and theobromine, 16 species of Sect. Thea were revised and confirmed as independent species. They are Camellia kwangnanica Chang et Chen, C. pentastyla Chang, C. irrawadiensis Barua, C. crispula Chang,C. atrothea Chang et Wang, C. rotundata Chang et Yu, C. makuanica Chang et Tang, C. remotiserrata Chang, H. S. Wang et P. S. Wang. C. nanchuanica Chang et Xiong, C. jinyunshanica Chang et Xiong, C. yungkiangensis Chang, C. pubescens Chang et Ye, C. arborescens Chang et Yu, C. multisepala Chang et Tang, C. dehungensis Chang et Chen and C. parvisepaloides Chang et Wang.
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发布时间：2023-12-11 - 摘要：The point location of insect is randomly and independently infected by the infectious pathogens. After the multiple-infection has been taken into account in total point locations, the infection threshold(TI) of the pathogen can be calculated. The results shown that the TI of nuclear polyhedrosis virus of Spodoptera litura F. (SINPV) was positively related to temperature and larval instars. Under the temperature of 20℃ to 40℃, the TI for 3rd instar were between 9 090. 9 PIBs and 666 666. 7 PIBs per larvae,and for 5th instar were between 131 578. 9 PIBs and 714 285. 7 PIBs per larvae. The TI differences between different instars were gradually reduced with the rising temperature. In some inoculum numbers, the infection of SINPV have certain self-antagonism and selfmutualism. As the indices describing infection threshold, pathogeneicity, and disease-resistance of insect, the TI is superior to LD50 and LC50.
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发布时间：2023-12-11 - 摘要：Peanut seed vigor was formed in the process of seed development. During development of peanut seed, synthesis and accumulation of storage proteins, proteinases and neat-stable proteins presented a very close relationship with seed vigor, and ABA played an important role in vigor formation process. Speed of vigor formation was not equal in the process of seed development, It speeded up at later developmental stage.关键词： peanut seed;vigor formation;abscisic acid (ABA);storage proteins;proteinases;heat-stable proteins
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发布时间：2023-12-11 - 摘要：The aim of this paper is to present an approach to the study of multiresolution analysis and B-spline-wavelets on a bounded interval. In this case we no longer have orthegonality in one scale, but there are exlicit formulate of these wavelets and a vanishing moment property on a bounded interval.
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发布时间：2023-12-11 - 摘要：The generalized difference scheme base on Zienkiewicz element is discussed for a model problem Poisson equations. The error estimate and numerical example are given. As applications, a generalized difference iterative algorithm is suggest for the problem of potential flow of water with free surface, and a generalized difference algorithm on similar elements is suggest for the vibration problem of two-dimensional floating body.
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发布时间：2023-12-11 - 摘要：An elliptic Lindstedt - Poincare (L - P ) method is presented for the limit cycle analysis of the generalized Van der Pol equations, in which the Jacobian elliptic functions are employed instead of the usual circular functions in the classical L-P perturbation procedure. The solution obtained by this method has much higher accuracy than other elliptic function methods, which gave only first order approximate solution.关键词： limit cycle;elliptic functions. L-P method
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发布时间：2023-12-11 - 摘要：Some aging criteria defined by Laplace ordering are generalized to the concept of random variable orderings which are partial orderings. Some relationships among these partial orderings related to aging criteria are discussed and the interpretations of these relationships in reliability are described.
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发布时间：2023-12-11 - 摘要：The influences of the magnon-electron interaction on the persistent currents in the textures mesoscopic ring are studied. We show that the amplitude of the current is exponentially reduced by a factor compared to the free case due to the magnon-electron interaction.关键词：mesoscopic ring;persistent currents;ferromagnetic spin-wave;magnonelectron interaction
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发布时间：2023-12-11 - 摘要：By using a perturbative canonical transformation and mean field theory, the parameter regimes that give rise to ferromagnetism are determined in the one-dimensional Hubbad-Hirsch model. The model decribes a tight-binding band with on-site repulsion U. nearest-neighbor Coulomb exchange matrix element J" and doping parameter δ.Ferromagnetism only occurs for J">0. with the required value of J" decreasing as U increases and increasing as δ increases. The ferromagnetism regions are always smaller than that for half-filling for a fixed J".关键词：ferromagnetism;Hubbard-Hirsch model
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发布时间：2023-12-11 - 摘要：A micro computer controlled high temporal resolution automatic measurement system used in ultrafast phenomena is reported. The temporal resolution is better than 1 fs (the optical path resolution is 0. 084 μm), and the relative detection sensitivity is 10-6. It has high stability and repeat ability, applied in the measurements of ultrashort pulses. The applications of this system in the measurements of femtosecond pulses and in the ultrafast dynamics of semiconductors are also discribed.关键词：ultrafast phenomana;autocorrletor;time-resolved spectroscopy
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发布时间：2023-12-11 - 摘要：The complexes of rare earths (La3+, Nd3+, Eu3+, Gd3+, Tb3+, Er3+) with pyridinioacetate (C5H5N+CH2CO2-, abbreviated as pyb) and 2, 2’-bipyridine (bpy) have been synthesized and characterized as RE2 (bpy)5 (pyb)4 (ClO4)6·5H2O by elemental analysis and infrared spectra. The crystal structure analysis of Eu3+ complex show that the crystal is triclinic. The electrostatic characteristic of the bonds between RE3+ and ligand have been discussed using the f-f hypersensitive transition absorption spectra and fluorescent spectra.
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发布时间：2023-12-11 - 摘要：The results of kinetics studies for the isomerization of Xylene isomers over ZSM-5 zeolites indicate that the activation energies and pre-exponential factors of the processes exhibit a compensation effect. The effect is interpreted essentially as a consequence of the compensation of the enthalpy and entropy each other in adsorption and activation.关键词： heterogeneous catalysis;compensation effect;Xylene isomerization
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发布时间：2023-12-11 - 摘要：Five new solid complexes of Ti (Ⅳ) dicarboxylate were prepared by the reaction of titanium tetrachloride with oxalic acid, malonic acid, succinic acid, glutaric acid,and adipic acid, respectively. The general formula of these complexes is Ti2O2 (OH)2L ·nH2O (L=dicarboxylate, n=1. 5￣3). The composition of complexes were determined by elemental, TG and IR analyses. The thermal decomposition stages and the intermediates of the complexes were examined using TG, DSC, IR and X-ray diffraction. The activation energy , enthalpy change △rH and entropy change △rS were determined from TG and DSC curves.
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发布时间：2023-12-11 - 摘要：The characteristics of spatial and temporal fractal dimension and their varying regularities of landslides are researched, and an accumulative principle of fractal dimension increase is proposed. Based on the studies of several typical landslides in China, the relationship between fractul dimension and the prognosis of landslides is given out.关键词： landslide;fractal dimension;prognosis
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发布时间：2023-12-11 - 摘要：Based on studies of marine-erosion platforms, marine - built surface in Late Pleistocene Eopeh and elevations of apex underlying seashore facies sticky soil under the sand barrier etc, it’s recoginsed that the South China Sea high level and its north coastline is similar to that of present in second interglacial stage of about (2￣ 3) 104 a B. P. The costal landforms in the north of South China Sea is characteristic by the fact that the heights of marine-erosion platforms formed in Late Pleistocene Epoch and Holocene Epoch are similar, and the new and old sand barriers are close at hand and also have simllar heights. In general, the tectonic uplift and subsidence in the coasts of rock and barrier-lagoon are relatively stable, but delta coasts subside intermittently in same time.关键词：South China Sea;late Pleistocene Epoch;high sea level;coastal landform
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发布时间：2023-12-11 - 摘要：Based on studies of marine-erosion platforms, marine - built surface in Late Pleistocene Eopeh and elevations of apex underlying seashore facies sticky soil under the sand barrier etc, it’s recoginsed that the South China Sea high level and its north coastline is similar to that of present in second interglacial stage of about (2￣ 3) 104 a B. P. The costal landforms in the north of South China Sea is characteristic by the fact that the heights of marine-erosion platforms formed in Late Pleistocene Epoch and Holocene Epoch are similar, and the new and old sand barriers are close at hand and also have simllar heights. In general, the tectonic uplift and subsidence in the coasts of rock and barrier-lagoon are relatively stable, but delta coasts subside intermittently in same time.关键词：South China Sea;late Pleistocene Epoch;high sea level;coastal landform
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发布时间：2023-12-11 - 摘要：Tide gauge records were collected from nine stations. High frequency components were removed form monthly mean time series by the Maximum Flat Filter. Three orthogonal eigenmodes which accounted for 93% of the total variance of the low passed time series were found through EOF analysis. According to the distribution of spatial and temperal eigenvectors, the characteristics of the water stage variability in the Pearl River Delta area were discussed. The overall average rate of water stage change is 2. 1 mm/a. Based on co-spectrum analysis,the frequency responses of water stage to variations in river discharge, wind, atmospheric pressure and atmospheric temperature were discussed.
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发布时间：2023-12-11 - 摘要：The gain superposition principle (GSP) for optically pumped FIR laser is deduced. By use of GSP, the complicated calculation of laser processes occuring in a multi-level molecular system could be simplified greatly.关键词：optically pumped FIR laser;gain superposition principle
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发布时间：2023-12-11 - 摘要：The improvements of data receiving and process method for the gravitational waves detection in Zhongshan University are described. Using this method to analyze the data obtained during the collisions of Comet SL9 with Jupiter in July, 1994, no evidence of the gravitation radiation from the collisions has been found.
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发布时间：2023-12-11 - 摘要：The use of bromine-triphenyl phosphite as the brominating agent for the bromination of 3-methyl -3-buten-1-ol is reported with this new method, the reaction was easily controlled,the isolation and purification of the brominatcd product were convenient, the yield was increased.It also indicated that phosphorus tribromide is not a suitable agent for the bromination of this kind of alcohol. The structure of the brominated product was confirmed by 1H NMR data.关键词：bromination;3-methyl-3-buten- 1-ol;4-bromo-2- methyl- 1-butene;bromine-triphenyl phosphite
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发布时间：2023-12-11 - 摘要：In the presence of KF-Al2O3, 1, 1’-bi-2, 2’-dinaphthol ether and 1, 1’-bi-2, 2’-dinaphthoxy acetic ester were obtained by the reactions of 1, 1’-bi-2, 2’-dinaphthol with monahalide or bromoethyl acetate, and 1, 1’-bi- 2, 2’- dinaphthoxy acetamide and 1, 1’- bi- 2, 2’- dinaphthoxy acetic acid were obtained by further ammonolysis or hydrolysis of the 1, 1’-bi-2, 2’-dinaphthoxy acetic ester.
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发布时间：2023-12-11 - 摘要：The chloroplast DNA (cpDNA) from 11 rice varieties was analysed for their RFLP using EcoRI and AvaI. More variations in cpDNA were found in indica rice than in japonicarice. Also, the results show that the restriction fragment patterns of rice cpDNA are not strictly subspecies-specific.
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发布时间：2023-12-11 - 摘要：The construction of three of the structural unit Co(abt) ( ) (abbreviated as MLL,obtained from CoCl2,abtNa and ,abt = o - aminobenzenethiolate) in the presence of Li2S forms the tricobalt-phosphine-thiolato cluster complex Co3 (abt )3 (μ3-S ) ( )3. The triangular Co3molecular plane is capped by an inorganic μ3-S and each penta-coordinated Co atom is further ligated by a phosphine and an abt ligand to form a distorted trigonal bipyramid. Each of the thiolato sulfur atoms bridges the adjacent Co atoms to give a μ2-S bridge resulting in an average Co-Co distance of 0. 270 9 nm.
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发布时间：2023-12-11
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