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return kwic search for over out of >500 occurrences
295512 occurrences (No.81 in the rank) during 5 years in the PubMed. [no cache] 500 found

2) Over the last 50 years, significant research has been directed towards the cleanup of PAH-contaminated soils to background level.

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PMID:24271723 DOI:10.1007/s11356-013-2270-0

2015 Environmental science and pollution research international

* Managing long-term polycyclic aromatic hydrocarbon contaminated soils: a risk-based approach.

- Polycyclic aromatic hydrocarbons (PAHs) are a family of contaminants that consist of two or more aromatic rings fused together. Soils contaminated with PAHs pose significant risk to human and ecological health. Over the last 50 years, significant research has been directed towards the cleanup of PAH-contaminated soils to background level. However, this achieved only limited success especially with high molecular weight compounds. Notably, during the last 5-10 years, the approach to remediate PAH-contaminated soils has changed considerably. A risk-based prioritization of remediation interventions has become a valuable step in the management of contaminated sites. The hydrophobicity of PAHs underlines that their phase distribution in soil is strongly influenced by factors such as soil properties and ageing of PAHs within the soil. A risk-based approach recognizes that exposure and environmental effects of PAHs are not directly related to the commonly measured total chemical concentration. Thus, a bioavailability-based assessment using a combination of chemical analysis with toxicological assays and nonexhaustive extraction technique would serve as a valuable tool in risk-based approach for remediation of PAH-contaminated soils. In this paper, the fate and availability of PAHs in contaminated soils and their relevance to risk-based management of long-term contaminated soils are reviewed. This review may serve as guidance for the use of site-specific risk-based management methods.

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[frequency of next (right) word to over]

(1)145 the	(8)6 their	(15)3 four	(22)2 40
(2)70 time	(9)4 6	(16)3 longer	(23)2 OP
(3)67 a	(10)4 in	(17)3 other	(24)2 another
(4)12 time,	(11)3 1	(18)3 placebo	(25)2 collagen)
(5)9 of	(12)3 12	(19)2 2	(26)2 left
(6)7 and	(13)3 24	(20)2 30	(27)2 long
(7)6 an	(14)3 65	(21)2 4	(28)2 settlement

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--- WordNet output for over --- =>1.超えて, 一面に, 移って, 始めから終わりまで, 終わって, を支配して, の間, しながら, 倒れて, の上に, を覆って, を越えて, の向こう側に, より多く, 2.もう一度, 繰り返して Overview of noun over The noun over has 1 sense (no senses from tagged texts) 1. over -- ((cricket) the division of play during which six balls are bowled at the batsman by one player from the other team from the same end of the pitch) Overview of adj over The adj over has 1 sense (first 1 from tagged texts) 1. (21) complete, concluded, ended, over, all over, terminated -- (having come or been brought to a conclusion; "the harvesting was complete"; "the affair is over, ended, finished"; "the abruptly terminated interview") Overview of adv over The adv over has 5 senses (first 3 from tagged texts) 1. (23) over -- (at or to a point across intervening space etc.; "come over and see us some time"; "over there") 2. (2) over -- (throughout an area; "he is known the world over") 3. (1) over, o'er -- (throughout a period of time; "stay over the weekend") 4. over -- (beyond the top or upper surface or edge; forward from an upright position; "a roof that hangs over";) 5. all over, over -- (over the entire area; "the wallpaper was covered all over with flowers"; "she ached all over"; "everything was dusted over with a fine layer of soot") --- WordNet end ---