scholarly journals Analysis on Urban River Ecological Restoration and Landscape Reconstruction Methods --Taking Baima River of Fuzhou as an Example

2018 ◽  
Keyword(s):  
Ecological Restoration ◽  
Urban River ◽  
Landscape Reconstruction ◽  
Reconstruction Methods

Ecological Restoration by a Multistage Floating-Bed System in a Eutrophic Urban River, China

2012 ◽  
Vol 157-158 ◽  
pp. 945-949 ◽  
Author(s):  
Yu Hui Chen ◽  
Yong Zhang ◽  
Min Sheng Huang ◽  
Yi Fan Zhang ◽  
Feng Zhao ◽  
...  
Keyword(s):  
Water Quality ◽  
Ecological Restoration ◽  
Control Area ◽  
Urban River ◽  
Polluted Water ◽  
Recovery Efficiency ◽  
Dynamic Variation ◽  
Multistage System ◽  
Restoration Work ◽  
Ecological Recovery

By constructing a multistage floating-bed system by combination of macrophytes, aquatic animals and aquamats ecobase for ecolgical restoration in a eutrophic urban river, the improvement of water quality and the dynamic variation of phytoplankton was investigated. The results showed that the average removal rates were 9.85%, 15.86%, 24.47% and 12.75%, respectively. phytoplankton quantity was decreased by 22.82×104ind./L and Shannon-Weiner Index was increased by 0.11 averagely, after the restoration work in the demonstration area comparing to control area. The negative correlation between Shannon-Weiner Index of phytoplankton and TN(-0.77, P<0.01) showed that multistage system might effect phytoplankton indirectly through removing nutrients from river, which indicated that the employment of ecological restoration technology of multistage floating-bed system was effective in raising the ecological recovery efficiency of polluted water bodies.

Ecological Restoration Programs for SO2 Emission from an Operation High-Sulfur Gas Field

2013 ◽  
Vol 726-731 ◽  
pp. 1786-1790
Author(s):  
Ai Ping Zhang
Keyword(s):  
Ecological Restoration ◽  
Absorption Capacity ◽  
Ecological Environment ◽  
Soil Protection ◽  
Gas Field ◽  
Protection Measures ◽  
Landscape Reconstruction ◽  
Ecological Landscape ◽  
Gas Fields ◽  
Development And Management

A high-sulfur gas field is at trial operation, and its H2S content is up to 14%~18%. If the high-sulfur gas field was operated properly and improperly, effects of SO2 emission on regional ecological environment were analyzed. Based on the investigation of ecological environment status, the sulfur-absorption capacity of regional ecosystem was estimated, and then the ecological restoration programs were put forward, including the vegetation restoration program, the spoil ground restoration program, the ecological landscape reconstruction program and soil protection measures. This may offer experience for development and management of other similar gas fields.

Ecological Restoration Approaches for CO2 Emission from a Large Gas Field at Operation Period

2014 ◽  
Vol 955-959 ◽  
pp. 2613-2618
Author(s):  
Ai Ping Zhang ◽  
Wei Ming Chen ◽  
Jie Liu ◽  
Dan Liu
Keyword(s):  
Sustainable Development ◽  
Ecological Restoration ◽  
Empirical Equations ◽  
Total Emission ◽  
Low Carbon ◽  
Gas Field ◽  
Landscape Reconstruction ◽  
Operation Period ◽  
Large Gas Field ◽  
Ecological Landscape

The capacity of a large gas field is up to hundreds of billions of cubic metres, and percentage of the CO2 volume in raw gas is 8%~10%. Estimated by survey data and empirical equations, over 60% of the total emission from the gas field can be absorbed and utilized by regional crops and vegetation, and nearly a million tons per year exhausted. Based on analysis of mechanism and effect of CO2 influence on regional plants, soil and atmosphere, approaches for regional ecological restoration are put forward, including the approach of regional crops restoration, other plants restoration, ecological landscape reconstruction, and CO2 reduction technologies. This study provides reference for sustainable development of other gas field in low carbon era.

An Explorative Study on Landscape Design of Urban River Channels Based on Ecological Restoration

2013 ◽  
Vol 790 ◽  
pp. 429-432
Author(s):  
Man Lu ◽  
Jian Zhou
Keyword(s):  
Ecological Restoration ◽  
Urban Landscape ◽  
River Channel ◽  
Living Environment ◽  
Urban River ◽  
River Channels ◽  
Existing Problems ◽  
Explorative Study ◽  
Ecological Principles ◽  
Sustainable Landscape

As urbanization accelerates, urban river channels become increasingly important in maintaining urban ecological balance, improving urban landscape and optimizing living environment. City requires sustainable development. The application of ecological principles in urban landscape designs would help identify the most suitable way of utilizing resources and space to lessen disruption of ecological environment and reduce uncertainty of future development [ in hopes of realizing sustainable landscape designs. This paper analyzes existing problems in river channel construction and explores ecological restoration in urban river channel designs on the basis of the analysis of Jiangdongzhi Rive of Hangzhou.

High-resolution scanning electron microscopy (HRSEM) of mitochondria from various rat tissues

1988 ◽  
Vol 46 ◽  
pp. 14-15
Author(s):  
P.J. Lea ◽  
M.J. Hollenberg
Keyword(s):  
Electron Microscopy ◽  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Rat Hepatocytes ◽  
Three Dimensions ◽  
Objective Lens ◽  
Rat Tissues ◽  
Thin Sections ◽  
Reconstruction Methods ◽  
Scanning Electron

Our current understanding of mitochondrial ultrastructure has been derived primarily from thin sections using transmission electron microscopy (TEM). This information has been extrapolated into three dimensions by artist's impressions (1) or serial sectioning techniques in combination with computer processing (2). The resolution of serial reconstruction methods is limited by section thickness whereas artist's impressions have obvious disadvantages.In contrast, the new techniques of HRSEM used in this study (3) offer the opportunity to view simultaneously both the internal and external structure of mitochondria directly in three dimensions and in detail.The tridimensional ultrastructure of mitochondria from rat hepatocytes, retinal (retinal pigment epithelium), renal (proximal convoluted tubule) and adrenal cortex cells were studied by HRSEM. The specimens were prepared by aldehyde-osmium fixation in combination with freeze cleavage followed by partial extraction of cytosol with a weak solution of osmium tetroxide (4). The specimens were examined with a Hitachi S-570 scanning electron microscope, resolution better than 30 nm, where the secondary electron detector is located in the column directly above the specimen inserted within the objective lens.

3-D reconstruction and analysis of mammalian mitotic spindle structure

1992 ◽  
Vol 50 (1) ◽  
pp. 578-579
Author(s):  
Kent McDonald ◽  
David Mastronarde ◽  
Rubai Ding ◽  
Eileen O'Toole ◽  
J. Richard McIntosh
Keyword(s):  
Cross Sections ◽  
Mitotic Spindle ◽  
Experimental Studies ◽  
Video Camera ◽  
Three Dimensions ◽  
Mitotic Spindles ◽  
Black And White ◽  
Reconstruction Methods ◽  
Spindle Structure ◽  
Tissue Culture Line

Mammalian spindles are generally large and may contain over a thousand microtubules (MTs). For this reason they are difficult to reconstruct in three dimensions and many researchers have chosen to study the smaller and simpler spindles of lower eukaryotes. Nevertheless, the mammalian spindle is used for many experimental studies and it would be useful to know its detailed structure.We have been using serial cross sections and computer reconstruction methods to analyze MT distributions in mitotic spindles of PtK cells, a mammalian tissue culture line. Images from EM negatives are digtized on a light box by a Dage MTI video camera containing a black and white Saticon tube. The signal is digitized by a Parallax 1280 graphics device in a MicroVax III computer. Microtubules are digitized at a magnification such that each is 10-12 pixels in diameter.

Structural Studies on the Eukaryotic Ribosome

1990 ◽  
Vol 48 (1) ◽  
pp. 256-257
Author(s):  
Adriana Verschoor ◽  
Ronald Milligan ◽  
Suman Srivastava ◽  
Joachim Frank
Keyword(s):  
Chick Embryo ◽  
3D Reconstruction ◽  
Single Particle ◽  
Mass Density ◽  
Particle Surface ◽  
Uranyl Acetate ◽  
Electron Microscopic ◽  
Eukaryotic Ribosome ◽  
Negative Stain ◽  
Reconstruction Methods

We have studied the eukaryotic ribosome from two vertebrate species (rabbit reticulocyte and chick embryo ribosomes) in several different electron microscopic preparations (Fig. 1a-d), and we have applied image processing methods to two of the types of images. Reticulocyte ribosomes were examined in both negative stain (0.5% uranyl acetate, in a double-carbon preparation) and frozen hydrated preparation as single-particle specimens. In addition, chick embryo ribosomes in tetrameric and crystalline assemblies in frozen hydrated preparation have been examined. 2D averaging, multivariate statistical analysis, and classification methods have been applied to the negatively stained single-particle micrographs and the frozen hydrated tetramer micrographs to obtain statistically well defined projection images of the ribosome (Fig. 2a,c). 3D reconstruction methods, the random conical reconstruction scheme and weighted back projection, were applied to the negative-stain data, and several closely related reconstructions were obtained. The principal 3D reconstruction (Fig. 2b), which has a resolution of 3.7 nm according to the differential phase residual criterion, can be compared to the images of individual ribosomes in a 2D tetramer average (Fig. 2c) at a similar resolution, and a good agreement of the general morphology and of many of the characteristic features is seen.Both data sets show the ribosome in roughly the same ’view’ or orientation, with respect to the adsorptive surface in the electron microscopic preparation, as judged by the agreement in both the projected form and the distribution of characteristic density features. The negative-stain reconstruction reveals details of the ribosome morphology; the 2D frozen-hydrated average provides projection information on the native mass-density distribution within the structure. The 40S subunit appears to have an elongate core of higher density, while the 60S subunit shows a more complex pattern of dense features, comprising a rather globular core, locally extending close to the particle surface.

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