The substitution of a purine for a pyrimidine, or vice versa is a transversion.

On the other hand , cyclobutane pyrimidine dimmer ( CPD ) just has an effect of cell cycle arrest.

而CPD光 产物 ( cyclobutanepyrimidinedimmer, CPD ) 仅仅造成细胞周期暂时或短期的停滞现象.

Hydrogen bonds play important roles to living organisms containing pyrimidine-based derivatives.

氢键对含有以嘧啶为基的衍生物的生命体具有重要作用.

Cleudine is a pyrimidine analogue with potent and sustained antiviral activity against HB.

克来夫定为嘧啶类似物,对HB具有持续有效的抗病毒活性.

Study on the synthesis of 2-diethylamino-6-methyl-4-hydroxy pyrimidine.

二乙氨基 -6- 甲基 -4- 羟基嘧啶的合成研究.

Gold contents in pyrite may as highly as ten times.

对金矿床本身而言,一般细粒级、破碎的黄铁矿含金量高.

Native ruthenium and hedleyite were identified in the pyrite quartz lodes.

自然钉及含铂赫碲铋矿发现于其中的黄铁矿石英脉型矿五中.

Cathode material of pyrite powder for thermal battery was studied.

研究了热电池正极材料常用的矿物二硫化铁粉末的特性.

The extracting iron from pyrite cinder by reductive roasting and sulfuric acid leaching was investigated.

研究了高温还原焙烧、硫酸浸取提取硫铁矿烧渣中的铁.

The Fankou pyrite lead-zinc deposit is one of the famous lead-zinc deposits in our country.

粤北凡口黄铁铅锌矿床是我国著名的以铅锌为主的超大型矿床之一.

Pyrite is more abundant and cobaltiferous and occurs in heavy patches in the sulfide mass.

黄铁矿很多,并且含钴,在硫化物块体中成稠密的斑块.

Its gold content is closely related to pyrites and arsenopyrite.

矿石中的金以不可见金为主,含量与黄铁矿、毒砂关系密切.

We utilized the change of concentration ratio between pyrites and rocks to survey gold deposits.

所以通过金在黄铁矿及岩石中浓度比值的变化,能有效地指导勘查金矿床.

Pyrites often contain several nonferrous metal and noble metal elementS and be possessed of comprehensive utilization.

黄铁矿常含有多种有色金属和贵金属元素,具有综合利用价值.

The ore-hunting indicator is of calcite-potassium feldspar veins containing pyritohedron pyrite.

直接找矿标志为含五角十二面体黄铁矿铁方解石钾长石脉.

However , such materials are difficult to be fabricated without the appearance of a pyrochlore phase.

在铅基弛豫铁电材料的制备中, 很难避免焦绿石相的出现.

R . Schmidt ﹐ Descriptive Nomenclature & Classification of Pyroclastic Deposits & Fragments ﹐ Recomendation of IUGS Subcommision on the Systematics of Igneous Rocks ﹐ Geology ﹐ Vol.9﹐5﹐1981.

孙善平 ﹕国内外火山碎屑岩的分类、命名 、 历史及现状﹐《地球科学》﹐卷12﹐6﹐1987.

Schmidt ? Descriptive Nomenclature & Classification of Pyroclastic Deposits & Fragments ? Recomendation of IUGS Subcommision on the Systematics of Igneous Rocks ? Geology ? Vol.9? 5 ? 1981.

孙善平? 国内外火山碎屑岩的分类、命名 、 历史及现状? 《地球科学》? 卷12? 6? 1987.

Periods of volcanism are indicated by the presence of pyroclastic material in the formation.

群系中火成碎屑物的存在表明了火山酌的形成年代.

Pyroclastic rocks are a kind of transitional and complex rocks between lavas and sedimentary rocks.

摘要火山碎屑岩是介于溶岩和沈积岩之间的过渡类型岩石,岩类复杂.

Pengxian copper deposit is hosted by metamorphosed pyroclastic rock and basic intermediate lava.

彭县铜矿床含矿火山岩由各类变质火山碎屑岩及中基性熔岩所组成.