The cytochemistry of oocytes of Chinese shrimpPenaeus orientalis

In the growth of oocytes ofPenaeus orientalis Kishinouye, five stages were distinguished. Histochemical tests showed the presence of DNA in the chromatin and nucleolus of the cell. The cytoplasm at the previtellogenetic stage and the nucleolus are rich in RNA and the proteins abounding with cysteine, tyrosine and tryptophan. The yolk consists mainly of proteins and phospholipids. The 1,2-glycol groups of carbohydrate occur in the cytoplasm at stage II, and aggregate mostly into cortical rods at stages IV and V. Neutral lipid droplets, and protein containing disulfides, appear in the cytoplasm at stages III and IV respectively. The proteins in the cortical rod differ from those in other components of the cell in the presence of cystine and absence of arginine.     

南极长城站云和气溶胶光学特性的遥感和分析

本文根据光度计和半球辐射计观测的资料、分析了1988年12月至1989年2月南极长城站云和气溶胶光学厚度以及气溶胶的谱分布。结果表明,在长城站夏季,云和气溶胶的光学厚度都较大,其均值分别为12.7和0.094。     

The IPS work in Beijing astronomical observatory

This article describes the IPS work in the Beijing astronomical observatory including the hardware and software of the instrument and some theoretical research.The project is supported by the China National Nature Science Fundation under the program 49391400     

SIMULTANEOUS DETERMINATION OF AEROSOL SIZE DISTRIBUTION AND REFRACTIVE INDEX AND SURFACE ALBEDO FROM RADIANCE-PART III: PARAMETRIZATION AND APPLICATION

Based on the radiative transfer calculation results, three approximate expressions of the sky radiance in almucantar and its increment caused by surface albedo are presented. They are simple, but accurate enough. The dependence of the fitted aerosol scattering phase functions on refractive index is also studied, and its reasonable form is given. For Junge size distribution, the approximate equations of the phase functions with some special scattering angles are obtained. These approximate equations significantly simplify the retrieval algorithm of simultaneous determination of aerosol size distribution and its refractive index and surface albedo. This method can be realized with a microcomputer, and has been used to process and analyse the experimental data measured in Hefei of Anhui Province.     

大气象质衰减参数

介绍了天文成象中湍流大气的象质衰减参数：视宁度参数ｒ０，大气相干时间τ以及波前振幅的起伏（恒星闪烁σ２Ｉ），讨论了它们对成象的影响，其中着重讨论了ｒ０的物理本质并对其进行了定量分析。     

The 4 February, 1986 flare and flare-filament current model

In this paper, the observational data in H, radio, soft X-ray, hard X-ray, and -ray emissions for the 3B/X3.0 solar flare on 4 February, 1986 are collected. This flare is studied in detail by using the flare-filament current model. The momentum equations and the energy equations of the filament current have been solved. The influence of the highly sheared background magnetic field on the motion of the filaments is studied through numerical calculation. The results show that the resistive tearing instability is a possible pre-heating mechanism in the preflare phase, and both the rotation of the spiral sunspots and the highly sheared background field are necessary for the energy storage of this flare. The high-energy data of the flare imply that the current-loop coalescence instability is a possible eruptive mechanism.     

Geochemical studies on the intensity of chemical weathering in Luochuan loess-paleosol sequence, China

Major and trace element analyses of the Luochuan loess-paleosol sequence in China were performed in order to understand the cheniical weathering processes occurring on the I.oess Plateau during the last 600 ka. Results reveal that most elements in the loess remain immobile durlng chemical weathering. The typical stable elements are Al, K, Ti, Rb and REE, while the main mobile elements are Ca, Sr, P, Mg and Na. 120ess and paleosol experience the incipient stage of chemical weathering characterized by acid leaching and carbonate dissolution. Alteration of silicates in the sequence seems to be limited. Features of less chemical weathering of the loess and paleosol could he indicators for the dry-cold clinlate dominated on the Loess Plateau during the Quaternary. Project supported hy thc Nzitional Natural Science Foundation of China     

RESEARCH ON REBUILDING OZONE DYNAMIC SYSTEM OF ZONAL AVERAGE OVER THE TROPIC ZONE

The ozone data observed by TOMS in every 5°N are extended into the phase space to describe the characteristics of ozone with phase trace. First of all, the fractional dimension of the ozone layer is calculated. Then.the phase points are regarded as some discrete characteristics solution, and the parameters of mathematical model which describe the time variation of system state are retrieved, so that the nonlinear dynamic system which reflects the short-term variation of zonal average ozone layer over the tropics is rebuilt.     

松嫩平原土地次生盐碱化研究

松嫩平原是我国土地次生盐碱化最严重的地区之一。由于盲目开垦、过度放牧及一些水利工程带来的负效应,土地次生盐碱化迅速发展,每年增长速度达１％￣１．４％。到下世纪初将有４５％左右盐碱化土地退化为基本无利用价值的重盐碱地。主要防治措施有水田、芦苇开发和以藻代排的水利措施,改革草原经营机制、秸杆利用等草场改良和畜牧业发展措施,改土培肥、种植耐盐经济作物等农业技术措施。