全文获取类型
收费全文 | 575篇 |
免费 | 65篇 |
国内免费 | 617篇 |
专业分类
安全科学 | 25篇 |
废物处理 | 23篇 |
环保管理 | 19篇 |
综合类 | 694篇 |
基础理论 | 313篇 |
污染及防治 | 133篇 |
评价与监测 | 41篇 |
社会与环境 | 9篇 |
出版年
2024年 | 6篇 |
2023年 | 35篇 |
2022年 | 49篇 |
2021年 | 84篇 |
2020年 | 51篇 |
2019年 | 48篇 |
2018年 | 46篇 |
2017年 | 39篇 |
2016年 | 52篇 |
2015年 | 55篇 |
2014年 | 57篇 |
2013年 | 111篇 |
2012年 | 67篇 |
2011年 | 65篇 |
2010年 | 65篇 |
2009年 | 46篇 |
2008年 | 36篇 |
2007年 | 61篇 |
2006年 | 61篇 |
2005年 | 32篇 |
2004年 | 30篇 |
2003年 | 22篇 |
2002年 | 17篇 |
2001年 | 18篇 |
2000年 | 15篇 |
1999年 | 8篇 |
1998年 | 17篇 |
1997年 | 12篇 |
1996年 | 8篇 |
1995年 | 9篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 7篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 6篇 |
1979年 | 2篇 |
排序方式: 共有1257条查询结果,搜索用时 359 毫秒
91.
Single and joint toxic e ects of polycyclic musks including 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[g]-2-
benzopyran (HHCB) and 7-acetyl-1,1,3,4,4,6-hexamethyl-1,2,3,4-tetrahydronapthalene (AHTN) and cadmium (Cd) on seed
germination and seedling growth of wheat (Triticum aestivum) were investigated. The results showed that the toxicity sequence of
HHCB toxic to wheat seed germination and seedling growth was similar to that of AHTN, that is, germination rate > shoot elongation
> root elongation, while the toxicity of Cd was in the sequence of root elongation > shoot elongation > germination rate, according
to the LC50 and EC50 values. It is suggested that polycyclic musks and Cd had di erent toxicological mechanisms. Root and shoot
elongation of wheat might be good bioindicators for the contamination of polycyclic musks and Cd in soil. The mixture of polycyclic
musks and Cd had synergistic e ects on T. aestivum according to the equi-toxic mixture approach when root elongation was selected as
the toxicological endpoint. Thus, the joint toxicity of HHCB and Cd was significantly higher than the single toxicity of HHCB or Cd,
which was also confirmed by the EC50 mix value of the mixture (EC50 mix = 0.530 TUmix). The EC50 mix value of the mixture of AHTN
and Cd was 0.614 TUmix, which indicated that the mixture toxicity was strengthened when AHTN coexisted with Cd. 相似文献
92.
Variations between rice cultivars in iron and manganese plaque on roots and
the relation with plant cadmium uptake 总被引:4,自引:0,他引:4
To understand certain mechanisms causing variations between rice cultivars with regard to cadmium uptake and tolerance, pot soil
experiments were conducted with two rice cultivars of di erent genotypes under di erent soil Cd levels. The relationships between
plant Cd uptake and iron/manganese (Fe/Mn) plaque formation on roots were investigated. The results showed that rice cultivars
di ered markedly in Cd uptake and tolerance. Under soil Cd treatments, Cd concentrations and accumulations in the cultivar Shanyou
63 (the genotype indica) were significantly higher than those in the cultivar Wuyunjing 7 (the genotype japonica) (P < 0.01, or P <
0.05), and Shanyou 63 was more sensitive to Cd toxicity than Wuyunjing 7. The di erences between the rice cultivars were the largest
at relatively low soil Cd level (i.e., 10 mg/kg). Fe concentrations in dithionite-citrate-bicarbonate root extracts of Shanyou 63 were
generally lower than that of Wuyunjing 7, and the di erence was the most significant under the treatment of 10 mg Cd/kg soil. The
results indicated that the formation of iron plaque on rice roots could act as a barrier to soil Cd toxicity, and may be a “bu er” or a
“reservoir” which could reduce Cd uptake into rice roots. And the plaque may contribute, to some extent, to the genotypic di erences
of rice cultivars in Cd uptake and tolerance. 相似文献
93.
94.
某型飞机对接螺栓微动疲劳裂纹分析 总被引:3,自引:2,他引:1
通过断口形貌观察、X射线能谱检测、痕迹分析等试验方法,对某型飞机对接螺栓产生裂纹的原因进行了分析.结果表明,对接螺栓的裂纹性质为微动疲劳裂纹;表层微动疲劳裂纹产生后,进一步发生了镉脆开裂;微动疲劳裂纹在飞机末次大修前就已形成,在大修镀镉时镉渗入裂纹内部,并导致了对接螺栓在大修后的使用中裂纹发生镉脆扩展. 相似文献
95.
抗铅、镉菌株对土壤铅、镉生物有效性的影响 总被引:3,自引:0,他引:3
将从土壤中分离到的2株能同时耐铅(Pb)、镉(Cd)的抗性菌株(编号为H1和H2)分别接种至Pb、Cd污染的土壤中进行小白菜盆栽试验,研究2株抗性菌株对土壤Pb、Cd生物有效性的影响。结果表明:H1菌株可专一性的钝化交换态Cd,降幅为43.78%,并能显著促进小白菜地上部生长,与对照相比增产79.62%;H2菌可同时降低交换态Pb、Cd的比重,降幅分别为30.31%和27.61%,但小白菜产量与对照无显著差异。此外,与对照相比,接菌处理均能显著降低小白菜地上部Pb、Cd含量。 相似文献
96.
97.
98.
采用体内试验和体外试验方法,观察氯化镉对小鼠免疫功能的影响。免疫后不同时间,给小鼠一次灌胃30mg/kgCdCl2,未见对免疫功能产生明显影响。反复多次灌胃染毒14天,在0.3mg/ks/d组可见明显抑制小鼠脾淋巴细胞IgM-pFC,抑制率为42.1%。体外试验表明,12.5μmol/LCdCl2与淋巴细胞作用48h,25μmol/LCdCl2作用72h,对淋巴细胞增殖反应抑制率分别为38.3%和77.8%,以上结果表明氟化钢具有明显的免疫毒性。 相似文献
99.
100.
镉和硒染毒对大鼠体内一些营养元素的影响 总被引:1,自引:0,他引:1
为了解染毒元素 Cd 和 Se 在生物体内对一些营养元素的影响,采用体内中子活化分析和原子吸收法分析了大鼠被高含量Cd或Se染毒后,不同组合的动物体内这些元素的平均含量的变化.结果表明,高含量 Cd 使大鼠体内N、Ca 、Zn 、Cu 的含量大幅度的降低,而高含量Se使大鼠体内 N、Ca、Zn 、Cu的含量有一定的降低;当高含量的 Cd和 Se 同时在大鼠体内作用时, Se 和 Cd 对 N、Ca 、Zn 、Cu 元素,的毒性作用有相互缓解作用,而Se 和 Cd 对 P、K、Mg 元素毒性却有相互加重作用. 相似文献