氨基酸溶液浸取金的实验及其地质意义

氨基酸溶液金的实例表明，地质体中广泛存在的氨基酸（或其他有机酸）对Ａｕ有较强的溶解能力，其中以组氨酸（碱性氨基酸）对金的溶解能力最强；温度、浓度、酸碱度及氨基酸的类型是影响配合金的重要因素。不同氨基酸对金的溶解能力都各自有没的最佳条件（温度、浓度、酸碱度）。在ｐＨ为６－８和８０℃的条件下，氨基酸对金的溶解能力最强。氨基酸可将水体和岩石中分散的Ａｕ迁移并在合适的条件下聚集起来，在扬子板块周边微细侵染     

骆驼蓬属叶中氨基酸组成与抗逆性的关系

实验结果证明：西北地区骆驼蓬属叶中总氨基酸和游离氨基酸组成中均以天冬氨酸、苏氨酸、丝氨酸、谷氨酸、丙氨酸、缬氨酸、苯丙氨酸、组氨酸、和脯氨酸为主要组分。其中，天冬氨酸、苏氨酸、谷氨酸、苯丙氨酸、和脯氨酸表现出种间的量值差异。不同生境下的骆驼蓬和多裂骆驼蓬均以天冬氨酸等９种氨基酸为主要组分，但因生境不同而在部分氨基酸含量上有明显差异。生于盐碱荒地的骆驼蓬，其脯氨酸含量为不同生境下同种的１１．３倍和８．８５倍。不同生境下的多裂骆驼蓬其脯氨酸含量依干旱胁迫减弱而降低。表明细胞中脯氨酸积累与植物的耐盐、抗旱性有关     

The Energetic and Nutritional Contribution of Glucose and Glycine Taken up from Natural Sea Water by Adult Marine Mussels

Abstract. The removal of glycine and glucose by freshly collected adult Mytilus edulis was determined using radiolabeled substances added to ambient concentrations of dissolved organic materials in freshly collected natural sea water. Uptake rates were calculated for substrate concentrations of 0.5 μM glycine and 1.0 μM glucose and were compared with the animals' energy and nitrogen demands as measured by oxygen consumption and ammonia excretion rates. Respiration and ammonia excretion rates as well as cither glycine or glucose removal were all determined for the same animals. The mean respiration rate was 670μl O₂ g^-1h^-1, the mean ammonia excretion rate 1.95 μg-at NH₄-g^-1 h^-1. The calculated uptake rates were 0.48 μmol -g^-1-h^-1 for free amino acids and 0.44 μmol-g^-1 h^-1 for free simple sugars. Such uptake rates could have contributed roughly 13% of the mussels' energy requirements or 10% of the mussels' nitrogen requirements assuming the following conditions: 0.5 μM concentration of free amino acids, 1.0μM concentration of simple sugars, uptake of total amino acids at a rate based on a weighted removal rate of glycine, alanine, serine, and glutamic acid, and uptake of simple sugars at a rate equal to that of glucose removal. It is apparent that simple organic substances dissolved in sea water may be of some benefit to mussels, especially when the substances occur in concentrations typical of coastal sea water.     

栉孔扇贝氨基酸组份与含量的比较研究

本文指出栉孔扇贝干贝氨基酸含量较高,次于虾夷扇贝,高于海湾扇贝。其氨基酸的含量与个体大小成反比。在软体部中以闭壳肌的氨基酸含量最高:闭壳肌的平滑肌的氨基酸含量高于横纹肌。从分析栉孔扇贝的17种氨基酸中以谷氨酸含量最高。栉孔扇贝外套膜和内脏块均含有相当量的氨基酸,可加以利用     

南海颗粒物的氨基酸通量与组成

本文对在南海中部布设的两个层次（１１９１ｍ和３６９６ｍ）沉积物捕集器的沉降粒子进行了颗粒沉降通量和氨基酸组成的研究。南海的物质通量呈现季节性变化，深层样变动范围在６９．６～１４１．７ｍｇ／（ｍ２·ｄ）；但火山灰侵入后，其物质通量（按每月平均）高出１～２个数量级，氨基酸和氨基糖含量亦由原来的１０×１０－３和０．９×１０－３减少为０．０９×１０－３和０．０２×１０－３。氨基酸组分中以天门冬氨酸占优势，其次为甘氨酸与谷氨酸。在火山灰影响下，其丰度顺序为：谷氨酸＞天门冬氨酸＞甘氨酸。     

植物生长调节剂对几种饵料微藻的影响

本文研究三种植物生长调节剂对4种饵料微藻的生长、叶绿素含量、细胞大小、干重及氨基酸含量的影响;结果表明:丰产素,2,4—D对叉鞭金藻,青岛大扁藻有显著的促进生长作用,尤其是在低温下也能有效地促进其生长,并能保持其营养价值。     

Reconstructing estuarine conditions: oyster shells as recorders of environmental change, Southwest Florida

Live-collected shells of the oyster, Crassostrea virginica, contain geochemical records of modern temperature and salinity, so records of prehistoric conditions may be obtained from subfossil shells. Restoration of channelized watersheds in Florida is receiving much attention, and plans for targeted watersheds require information about estuarine conditions before channelization. Lack of historical records necessitates alternative methods to understand pre-disturbance conditions. A ¹⁴C-calibrated, amino-acid geochronology based on racemization of glutamic acid yielded ages ranging from 190–1220 AD and from 1270–1860 AD for subfossil oysters from Blackwater River (near-natural watershed) and for Faka-Union Bay (channelized watershed), respectively. δ¹⁸O and δ¹³C values of subfossil shells from Blackwater River indicate salinity and summer temperatures similar to present. Winter temperatures recorded in shells from 190, 590, 720, and 1050 AD appear 1–5 °C colder than present winter temperatures, whereas the shell from 1220 AD records winter temperatures similar to modern winter temperatures. These temperature shifts may indicate change in climate or natural seasonal variation of winter temperature from year to year. Subfossils from Faka-Union Bay may reflect a complicated hydrology, which cannot be evaluated by isotopic compositions alone and demonstrates the need for development of independent elemental proxies for temperature and salinity. Decreases in δ¹³C from subfossil to modern shells may in part result from CO₂ added to the atmosphere from fossil fuel burning (the Suess effect). Subfossil δ¹³C that is >1‰ more positive than modern shells suggest a change in the dominant carbon sources from terrestrial C₄ or aquatic plants to C₃ plants (mangroves).     

南海中部柱状沉积样中的氨基酸

本文通过对南海中部柱状沉积样中氨基酸的研究，阐述了各类氨基酸组分随岩芯深度而变化的分布规律，以及它们与其它一些参数诸如Ｃ、Ｎ、碳酸盐、蛋白石、有机碳等的相应关系。同时也讨论了出现这些情况的原因、机制。由此提供了不同地质年代沉积环境的有关信息。     

AccQ-Tag法测定毛蚶抗贫血口服液中的氨基酸含量

以 6 -氨基喹啉 - N-羟基琥珀酰亚胺基氨基甲酸酯 (AQC)为衍生剂 ,与毛蚶抗贫血口服液中的氨基酸柱前定量衍生 ,用 Waters HPL C仪 ,Acc Q- Tag TM专用 C18柱 (3.9mm× 15 cm) ,以140 mmol· L-1的醋酸钠溶液 (p H5 .0 2 )为溶剂 A,乙腈为溶剂 B,超纯水 (Milli- Q水 )为溶剂 C,进行梯度洗脱 ,检测波长为 2 4 8nm,35 min测试完毕。各种氨基酸测定的重现性 RSD%均 <3.0 %(n=5 )。该方法简便快速 ,结果准确可信。