Spatial distribution of phosphorus forms and the release risk of sediments phosphorus in West Lake, Hangzhou, China

2021 ◽  
Vol 173 ◽  
pp. 106421
Author(s):  
Dong Xu ◽  
Pan Yan ◽  
Zisen Liu ◽  
Mingzhen Zhang ◽  
Wenhao Yan ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
West Lake ◽  
Phosphorus Forms

Spatial distribution study of phosphorus forms in lake sediment

2019 ◽  
Vol 12 (9) ◽  
Author(s):  
Ali Dehbi ◽  
Hind Omari ◽  
Adil Lammini ◽  
Abdellah El Hmaidi ◽  
Abdelaziz Abdallaoui
Keyword(s):  
Spatial Distribution ◽  
Lake Sediment ◽  
Distribution Study ◽  
Phosphorus Forms

scholarly journals Spatial distribution characteristics of phosphorus forms in sediment of Lake Hongfeng, Guizhou Province

2012 ◽  
Vol 24 (5) ◽  
pp. 789-796 ◽  
Author(s):  
WANG Jingfu ◽  
◽  
CHEN Jing'an ◽  
ZENG Yan ◽  
YANG Yongqiong ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Guizhou Province ◽  
Distribution Characteristics ◽  
Phosphorus Forms ◽  
Spatial Distribution Characteristics

Seasonal dynamics and spatial distribution of Urocleidus ferox Mueller 1934, a gill parasite of Lepomis gibbosus (L.)

1978 ◽  
Vol 56 (6) ◽  
pp. 1241-1243 ◽  
Author(s):  
George Hanek ◽  
C. H. Fernando
Keyword(s):  
Spatial Distribution ◽  
Seasonal Dynamics ◽  
Sampling Period ◽  
Lepomis Gibbosus ◽  
West Lake ◽  
Gill Parasite ◽  
Anterior Side

Seasonal dynamics and spatial distribution were determined for Urocleidus ferox Mueller 1934, a gill parasite of Lepomis gibbosus (L.). Twenty-five specimens of L. gibbosus from eutrophic (West Lake) and 25 specimens from oligotrophic (Glenora) habitats were examined monthly between November 1971 and October 1972.The data were analysed using a two-factor ANOVA and Duncan's multiple range test.High abundance levels of U. ferox were recorded in both localities throughout the sampling period. The peak was reached in July 1972 and the lowest levels recorded in November 1971 in both localities. The eutrophic habitat, West Lake, was significantly (P < 0.001) more favourable for U. ferox than the oligotrophic one, viz. Glenora.The anterior side of hemibranchs and their medial sections were preferred sites of infection (P < 0.001); gill arches two and three were found to be preferred sites of infection (P < 0.001) for U. ferox.

Seasonal dynamics and spatial distribution of Cleidodiscus stentor Mueller 1937 and Ergasilus centrarchidarum Wright 1882, gill parasites of Ambloplites rupestris (Raf.)

1978 ◽  
Vol 56 (6) ◽  
pp. 1244-1246 ◽  
Author(s):  
George Hanek ◽  
C. H. Fernando
Keyword(s):  
Spatial Distribution ◽  
Seasonal Dynamics ◽  
Gill Arch ◽  
West Lake ◽  
Clear Preference ◽  
Anterior Side ◽  
Gill Parasites ◽  
Ambloplites Rupestris

Seasonal dynamics and spatial distribution were determined for Cleidodiscus stentor Mueller 1937 and Ergasilus centrarchidarum Wright 1822, gill parasites of Ambloplites rupestris (Raf.).Twenty-five specimens of A. rupestris from eutrophic (West Lake) and 25 specimens from oligotrophic (Glenora) habitats were examined monthly between November 1971 and October 1972.The data were analysed using a two-factor ANOVA and Duncan's multiple range test.High abundance levels of C. stentor and E. centrarchidarum were recorded in the two localities throughout the sampling period.Cleidodiscus stentor, the dominant parasite of A. rupestris in West Lake, reached the peak during March 1972 in West Lake and during April 1972 in Glenora. Ergasilus centrarchidarum, the dominant parasite of A. rupestris in Glenora, reached the peak during August 1972 in both localities.The anterior side of hemibranchs, their medial sections, and gill arch two were preferred sites of infection (P < 0.001) for C. stentor.Ergasilus centrarchidarum exhibited clear preference (P < 0.001) for anterior sides of hemibranchs and their dorsal and ventral sections, while its distribution over the four gill arches was fairly even.

Lithography below 100 nm

1983 ◽  
Vol 41 ◽  
pp. 96-99
Author(s):  
L. D. Jackel
Keyword(s):  
Spatial Distribution ◽  
Electron Beam ◽  
Electron Scattering ◽  
Electron Beam Lithography ◽  
Substrate Material ◽  
Local Electron ◽  
Electron Dose ◽  
Positive Resist ◽  
Exposure Process

Most production electron beam lithography systems can pattern minimum features a few tenths of a micron across. Linewidth in these systems is usually limited by the quality of the exposing beam and by electron scattering in the resist and substrate. By using a smaller spot along with exposure techniques that minimize scattering and its effects, laboratory e-beam lithography systems can now make features hundredths of a micron wide on standard substrate material. This talk will outline sane of these high- resolution e-beam lithography techniques.We first consider parameters of the exposure process that limit resolution in organic resists. For concreteness suppose that we have a “positive” resist in which exposing electrons break bonds in the resist molecules thus increasing the exposed resist's solubility in a developer. Ihe attainable resolution is obviously limited by the overall width of the exposing beam, but the spatial distribution of the beam intensity, the beam “profile” , also contributes to the resolution. Depending on the local electron dose, more or less resist bonds are broken resulting in slower or faster dissolution in the developer.

SEM evaluation of the TEM cold-stage double-film specimen

1984 ◽  
Vol 42 ◽  
pp. 272-273
Author(s):  
Jayesh Bellare
Keyword(s):  
Spatial Distribution ◽  
Sample Preparation ◽  
Sample Thickness ◽  
Specimen Preparation ◽  
Preparation Technique ◽  
Liquid Sample ◽  
Thin Specimen ◽  
Sample Preparation Technique ◽  
Cold Stage ◽  
Film Specimen

Seeing is believing, but only after the sample preparation technique has received a systematic study and a full record is made of the treatment the sample gets.For microstructured liquids and suspensions, fast-freeze thermal fixation and cold-stage microscopy is perhaps the least artifact-laden technique. In the double-film specimen preparation technique, a layer of liquid sample is trapped between 100- and 400-mesh polymer (polyimide, PI) coated grids. Blotting against filter paper drains excess liquid and provides a thin specimen, which is fast-frozen by plunging into liquid nitrogen. This frozen sandwich (Fig. 1) is mounted in a cooling holder and viewed in TEM.Though extremely promising for visualization of liquid microstructures, this double-film technique suffers from a) ireproducibility and nonuniformity of sample thickness, b) low yield of imageable grid squares and c) nonuniform spatial distribution of particulates, which results in fewer being imaged.

Macroprobe Mode for the Study of Segregation in Steels

1990 ◽  
Vol 48 (2) ◽  
pp. 260-261
Author(s):  
Auclair Gilles ◽  
Benoit Danièle
Keyword(s):  
Mechanical Properties ◽  
Spatial Distribution ◽  
High Performance ◽  
Volume Fraction ◽  
Sheet Steel ◽  
Acquisition Time ◽  
Chemical Information ◽  
X Ray ◽  
Accurate Quantitative Analysis ◽  
Optical Micrographs

During these last 10 years, high performance correction procedures have been developed for classical EPMA, and it is nowadays possible to obtain accurate quantitative analysis even for soft X-ray radiations. It is also possible to perform EPMA by adapting this accurate quantitative procedures to unusual applications such as the measurement of the segregation on wide areas in as-cast and sheet steel products.The main objection for analysis of segregation in steel by means of a line-scan mode is that it requires a very heavy sampling plan to make sure that the most significant points are analyzed. Moreover only local chemical information is obtained whereas mechanical properties are also dependant on the volume fraction and the spatial distribution of highly segregated zones. For these reasons we have chosen to systematically acquire X-ray calibrated mappings which give pictures similar to optical micrographs. Although mapping requires lengthy acquisition time there is a corresponding increase in the information given by image anlysis.

Ultrastructural analysis of the spatial distribution of MRNA

1992 ◽  
Vol 50 (1) ◽  
pp. 552-553
Author(s):  
Gary Bassell ◽  
Robert H. Singer
Keyword(s):  
Electron Microscopy ◽  
Spatial Distribution ◽  
In Situ Hybridization ◽  
High Resolution ◽  
Nucleic Acids ◽  
Colloidal Gold ◽  
Dna Probe ◽  
Nucleotide Analogs ◽  
Gold Particles

We have been investigating the spatial distribution of nucleic acids intracellularly using in situ hybridization. The use of non-isotopic nucleotide analogs incorporated into the DNA probe allows the detection of the probe at its site of hybridization within the cell. This approach therefore is compatible with the high resolution available by electron microscopy. Biotinated or digoxigenated probe can be detected by antibodies conjugated to colloidal gold. Because mRNA serves as a template for the probe fragments, the colloidal gold particles are detected as arrays which allow it to be unequivocally distinguished from background.

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