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In the framework of dynamic morphology theory, the centers of gravity and geometric centers of projections have been determined for the bodies of more than 182 forms of invertebrates, and these data have been used to distinguish four types of dynamic body shapes. It has been demonstrated that specific dynamic types of body shape are characteristic of individual taxa. In addition, there are a group of “transformers,” which may assume any dynamic type of shape, and a group of invertebrates with one predominant dynamic type. 相似文献
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Potentiometric studies of mixed complexes of cobalt(II) and copper(II) with l‐Asparagine and adenine
Hülya Demircan Demir Mürşit Pekin Aysen Kurt Cücü Emre Dölen Hassan Y. Aboul‐Enein 《毒物与环境化学》2013,95(3-4):357-367
A potentiometric titration technique has been used to determine the stability constants for the various complexes of Co(II) and Cu(II) with L‐asparagine and from DNA base, e.g. adenine. Stability constants of ternary systems have been evaluated by the method suggested by Irwing‐Rossotti. In addition, the conditional constants were calculated as a function of pH. The maximum values of the conditional formation constants were found to be in accordance with the mixed‐ligand complex formation constants in a determined pH region. Furthermore, the molar fractions of different species from mixed complexes were calculated by means of formation constants. The values of stability constants of mixed‐ligand complexes at 25°C are as follows: log K= 5.25 for Co(II)‐L‐asparagine‐adenine; log K= 9.30 for Cu(II)‐L‐asparagine‐adenine. The ionic strength was kept constant at I = 0.20 with NaClO4. 相似文献
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In the ladybird fauna of the steppe zone of the Southern Urals and the south of Western Siberia, five variants, three forms, and two habitus types of adult beetles are distinguished, and their hierarchy is established. The habitus diversity of ladybirds is revealed using a new method of describing each form in a polar system of coordinates whose center coincides with the center of gravity of the insect body. The system of ladybird habitus reflects the main directions of trophic specialization in the family. 相似文献
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Classification of dimension stone wastes 总被引:1,自引:0,他引:1
Karaca Z Pekin A Deliormanlı AH 《Environmental science and pollution research international》2012,19(6):2354-2362
Purpose
For countries in which the stone industry is well developed, opposition to quarry and plant waste is gradually increasing. The primary step for waste control and environmental management is to define the problem of concern. In this study, natural building stone wastes were classified for the first time in the literature.Methods
Following on-site physical observations and research at more than 50 quarries and 20 plants, stone wastes were classified as (1) solid, (2) dust and (3) semi-slurry, slurry and cake.Conclusions
As a result of this study, the characteristics of wastes, their main environmental threats and the industries in which wastes could be used were defined for each group. 相似文献
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