Migration and distribution of cadmium in aquatic environment: The important role of natural biofilms

2019 ◽  
Vol 670 ◽  
pp. 478-485 ◽  
Author(s):  
Xiuyi Hua ◽  
Xiaomeng Huang ◽  
Jiaqing Tian ◽  
Deming Dong ◽  
Dapeng Liang ◽  
...  
Author(s):  
Changjian Xie ◽  
Yuhui Ma ◽  
Peng Zhang ◽  
Junzhe Zhang ◽  
Xiaowei Li ◽  
...  

With the increasing environmental application and discharge of nano cerium dioxide (nano-CeO2), it is urgent to fully understand its ecotoxicological effects on the aquatic environment. This study for the first...


2019 ◽  
Vol 21 ◽  
pp. 185
Author(s):  
N. Moraitis ◽  
K. Vassalos ◽  
T. J. Mertzimekis ◽  
A. Godelitsas ◽  
P. Gamaletsos ◽  
...  

The important role of metals and metalloids in the aquatic environment can be studied by means of Syn- chrotron Radiation (SR)-based X-ray spectroscopic techniques. In the present work, we have performed analyses of data sets (μ–XRF, μ–XANES and μ–EXAFS), for coastal sediments and marine precipitates, obtained at the ANKA Synchrotron Facility in Karlsruhe Institute of Technology (KIT, Germany). Prelim- inary results with regard to the distribution and speciation of toxic (Hg and As) and biocompatible (Fe) metals and metalloids are presented herein. It is therefore demonstrated that Fe is easily precipitated as FeIII oxyhydroxides, most likely related to As, as well as ferrihydrite-type FeIII hydrated oxyhydroxides, whereas Hg is rather accumulated in the form of methyl-containing compounds.


Author(s):  
Svetlana Kizilova

The aim of the research is identifying the role of the futurological theories of the XX century in the mod-ern design of modular structures in the water environment. The leading research approach is based on the analysis of the principles of habitat organization from the point of view of the main visionary concepts of the XX century, which developed the idea of life on the water in the future, such as: architectural "metabolism", "mobile" architecture, arсology, architectural biomimetics and bionics. The approaches outlined in the framework of the futurological concepts of the last century include modularity, interchangeability of struc-tural elements, adaptation to changes in climatic conditions, application of the principles of growth and ag-gregation in natural systems to the architecture. The revealed approaches have been elaborated in the contemporary architectural concepts devoted to the development of the extreme water environment. Based on the analysis of implemented and conceptual pro-jects of the floating structures on the water, the types of spatial organization of modules are identified: line-ar, continuous, multiple, arbitrary, centralized. A graphical diagram illustrating the mechanism of aggrega-tion of modules for each type is made. These typologies can be applied in further design and experimental developments and theoretical studies in the field of biosphere-compatible architecture in the context of the aquatic environment.


1976 ◽  
Vol 54 (8) ◽  
pp. 1341-1345 ◽  
Author(s):  
J. G. Sivak

Refractive state of the eye of the blackfoot penguin (Spheniscus demersus) was measured in air and under simulated aquatic conditions. Contrary to the literature that states that penguins are adapted for vision under water and are therefore myopic in air, S. demersus is emmetropic in air and moderately hyperopic under water. Study of corneal curvature and pupil response indicates that a mechanism of compensation for amphibious activity involving a split aperture is not present. However, a relatively flat cornea minimizes the refractive change induced when moving from air to water or vice versa. It is suggested that the hyperopia that persists in water may be lessened through accommodation or as a result of the spectral quality of the aquatic environment (blue, blue-green).


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