ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

A multi-pond system as a protective zone for the management of lakes in China (1993)

Yin, Chengqing ; Zhao, Ming ; Jin, Weigen ; [et al.]

Springer

Hydrobiologia 251 (1993), S. 321-329

add to mindlist on the mindlist

Details

ISSN: 1573-5117

Keywords: multi-pond system ; non-point pollution ; ecotone ; filtering effects

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract A study was carried out in the small watershed of Chaohu Lake, where a scattered multi-pond system, as a part of the land-inland water ecotone, was found to be a good protective zone in the management of the lake. This multi-pond system can effectively reduce the non-point source load of nutrients, such as phosphorus and nitrogen from runoff water, and filter out sediments before they reach the lake. There are 150 artificial ponds in this small watershed, covering a surface area of 35.54 ha, which represents just under 5% of the whole catchment area. The nutrient retention in the first 9 months of the dry year 1988 was more than 90%. This multi-pond system needs low capital cost and energy consumption for maintenance, and is suitable for irrigation and drainage, while it recycles water and nutrients within the terrestrial agroecosystem. As a result of this case study, a multipond system is being proposed as part of a long term management strategy for the watershed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00007191

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Computational studies of peripheral ring twisting in meso-N-methyl pyridyl-substituted porphyrins (1993)

Monaco, Regina R. ; Zhao, Ming

New York, NY : Wiley-Blackwell

International Journal of Quantum Chemistry 46 (1993), S. 701-709

add to mindlist on the mindlist

Details

ISSN: 0020-7608

Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Semiempirical molecular orbital calculations for the porphyrins tetrakis(4-N-methyl pyridyl)porphine (H2TMpyP-4) and tetrakis(2-N-methyl pyridyl)porphine using the MNDO and AM-1 Hamiltonians suggest that twisting one or more of the pyridinium rings results, at considerable energy expense, in highly nonplanar macrocycle configurations as the exocyclic ring(s) approach coplanarity. The results imply that the mechanism of intercalation of H2TMpyP-4 into DNA cannot require twisting the exocyclic rings anywhere close to coplanarity with the central porphine core, but involves, instead, the inherent flexibility of DNA itself. © 1993 John Wiley & Sons, Inc.

Additional Material: 10 Tab.