海水中总溶解糖分析水样的保存方法

海水总溶解糖的数据是海洋初级生产力测定中的一项重要参数。该组份已有多种化学测定方法,但尚缺乏船用自动快速分析方法,待分析水样往往须要送回实验室测定。到目前为止,只有个别零星的报道涉及此问题,例如Walsh曾指出采样后3小时内水样的总溶解糖浓度基本不变,Handa在印度洋和大西洋调查中采用深冷法保存过滤水样,而Strickland和Parsons以及格拉斯霍夫则分别推荐以氯仿和氯化汞作为葡萄糖标准溶液的保护剂,     

近50年长江中下游地区夏季气温变化与环流异常

Using the daily data of temperature from China Meteorological Administration and the NCEP/NCAR reanalysis from 1960 to 2005, we have analyzed the relationships between the summertime high/low temperature events in the middle and lower reaches of the Yangtze River (MLRYR) and the related circulation anomalies in the Eastern Hemisphere. Our results have demonstrated that a significantly increasing trend is observed in daily minimum temperature in the past 50 years. And in some regions in the Northern Hemisphere, the opposite scenarios are observed in circulation anomalies in lower and upper parts of the troposphere in the years when the temperatures are higher than normal, as compared to those in the years when the temperatures are lower than normal in the middle and lower reaches of the Yangtze River (MLRYR). Additionally, the anomalous circulation structure in vertical direction in both the high and lower temperature years are barotropic. It is found that the emergence and maintenance of the aforementioned anomalous circulations are related to three kinds of wave train teleconnection patterns. Further more, influences of the long wave surface radiation on the air temperature are stronger in the nighttime than that in the daytime. While both the maximum and minimum temperatures have negative relationships with the sensible heat flux but positive relationships with the latent heat flux. To some extent, the anomalous dynamic heating (cooling) caused by the vertical thermal advection as well as the diabatic heating (cooling) caused by diabatic processes can explain the formation of the high (low) temperature events in the middle and lower reaches of the Yangtze River (MLRYR) in boreal summer.     

滴灌条件下土壤水盐运移特性的研究现状

滴灌条件下的水盐运移特性是寻求开发利用盐碱地和次生盐碱化防治的基础,国内外学者对此进行大量研究.在国内外研究成果的基础上,综述了滴灌点源入渗影响因素、入渗模型特性、水分分布特征、湿润体浸润形状、湿润锋运移、盐分运移的规律,为滴灌点源水盐运移的研究提供依据.     

1978年实用盐标在中国的情况

本文对海洋技术研究所用于标准盐度系统的技术方法和仪器设备进行评价,其结论是:在中国可以相同的精度复现1978年实用盐标。     

用EOF方法分析华中五省近47年总云量变化分析

选用华中五省20个全球交换站1959～2005年逐月云量观测资料,用EOF方法分析了近47年来华中五省总云量的年、季节变化规律及其地域分布特征.     

试评“佛子岭群的地质时代问题”一文

读了杨志坚的“佛子岭群的地质时代问题”一文,我们觉得有必要提出商榷的意见。该文的主要论点是不同意把佛子岭群划为元古界,而肯定其属石炭-二迭纪)。为此作者提出了八条证据,我们就其中主要几条和杨志坚同志进行讨论:     

合浦珠母贝基因组微卫星富集文库的构建与分析

采用生物素标记的(AC)_(15)探针和磁珠富集法构建合浦珠母贝(Pinctada fucata)基因组DNA微卫星富集文库。随机挑选2097个克隆进行筛选,得到483个候选克隆(23.03%),对其中135个阳性克隆测序分析发现122个克隆含有微卫星重复单元(90.37%)。进一步通过序列比对,最终得到65个具有特异微卫星序列的阳性克隆(53.28%),其中包含85个微卫星DNA结构域,其中完美型(perfect)70个,占82.36%;非完美型(imperfect)7个,占8.24%;混合型(compound)8个,占9.41%,重复次数主要分布在5~20(95.74%),平均重复次数为7.83,(AC/GT)n重复所占比例最高(75.53%)。基于微卫星两端的侧翼序列,利用Primer Premier 5.0设计引物,获得11对具有多态性的微卫星引物。本研究为开展合浦珠母贝分子育种及资源评价分析提供了基础资料。