constancy of species是什么意思

网络释义

用法例句

Evaluation of Economic Loss of Biological Invasion on Species and Genes;

生物入侵对物种及遗传资源影响的经济评估

Study of species in Ni(Ⅱ)-NH_3-NH_4Cl-H_2O system;

Ni(Ⅱ)-NH_3-NH_4Cl-H_2O体系中物种研究

Extinction in a Special Three-species Predator-prey-chain Nonautonomous Diffusive System;

一个特殊三物种捕食链非自治扩散系统的灭绝

On the Active Oxygen species of ThO_2-La_2O_3/BaCO_3 Catalyst for OCM;

甲烷氧化偶联催化剂ThO_2－La_2O_3／BaCO_3上活性氧物种研究

Transformation of various oxygen species adsorbed on electrolytic silver surface pretreated by pure oxygen at 423～973 K under ambient pressure was observed for the first time by in situ confocal microprobe Raman spectroscopy.

首次采用原位共焦显微激光拉曼光谱研究了经纯氧预处理后电解银表面吸附的不同氧物种在升温过程中相互转化的情况。

Effects of re oxidation temperature and oxygen species of vanadium phosphorous oxide (VPO) catalyst on n butane selective oxidation to maleic anhydride (MA) were experimentally studied using on line mass spectroscopy (MS) transient measurement in a fixed bed micro reactor.

在固定床微型反应器中 ,利用在线质谱动态响应技术 ,考察了VPO催化剂再氧化温度和不同氧物种对正丁烷选择氧化制顺酐 (MA)的影响。

On the basis of 1H NMR and 51 V NMR, it was suggested that the peroxovanadate was the active species for the epoxidation of olefins, and the reaction mechanism was proposed.

根据烯烃环氧化控制实验中 1HNMR和 51VNMR谱的研究结果 ,提出了过氧钒物种是烯烃环氧化反应的主要活性物种 ,并假设了H15Li4V12 B3 2 O84催化烯烃环氧化反应的机理 。

New progress of in situ measurement of transient species is reviewed in detail.

本文简要介绍了化学电离质谱的基本原理、仪器构成及特点,总结了化学电离质谱在大气痕量物种,如无机酸H2SO4、HNO3,自由基OH。

Advances in conservation methods of endangered species;

濒危物种保护方法研究进展

Application of DNA molecular markers in endangered species conservation;

DNA分子标记技术在濒危物种保护中的应用

Five types of population viability analysis (PVA) models have been developed for estimating extinction risk of endangered species.

目前已提出了五类估计濒危物种绝灭风险的种群生存力分析模型 ,即 :分析模型、单种群确定性模型、单种群随机模型、异质种群模型和显空间模型。

Effect of exotic species Mytilopsis sallei on macrozoobenthos in the Maluan Bay,Xiamen in China;

外来物种沙筛贝对厦门马銮湾大型底栖动物的影响

This paper points out that the aggression of exotic species quickens the forfeiture of the living thing’s varieties, and destroys the ecosystem, and threatens human's health, and causes great loss of the economy, so it brings the side effect to the sustainable development and the human society.

指出了外来物种入侵加快了生物多样性的丧失、破坏了生态系统、造成了巨大的经济损失并危害人类健康,给人类社会的可持续发展造成了严重的负面影响,并提出了减轻外来物种入侵的措施。

A new exotic species of Asteraceae (Compositae) has been appearing in Tianjin City and Hengshui and Langfang of Hebei Province.

专家鉴定结果证明这是一种我国从未报道过的外来物种Flaveria bidentis。

This article introduces present research of high voltage static electric processing equipment and experiment device,and notes the importance Of high voltage static electric technology in classification and select,biological activity of crop seed.

种子是植物遗传信息的携带者和保存者,作物种子是农业生产中最基本的生产资料之一。

In situ IR spectroscopy was used to study the superoxide species(O-2) for oxidative coupling of methane(OCM) over the BaF2/La2O3 catalyst.

结果表明,催化剂经O2预吸附后,在1 108~1 118 cm-1处出现超氧物种O2-的O-O键伸缩振动峰。