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

1、

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.

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2、

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.

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3、

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.

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4、

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.

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5、

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.

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6、

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.

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7、

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.

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8、

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.

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9、

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.

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10、

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.

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11、

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.

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12、

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.

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13、

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.

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14、

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.

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15、

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.

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16、

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.

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17、

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.

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18、

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.

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19、

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.

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20、

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.

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