Abnormalities of the attachment clamps of representatives of the family Diplozoidae

2002 ◽  
Vol 76 (3) ◽  
pp. 249-259 ◽  
Author(s):  
Š. Šebelová ◽  
B. Kuperman ◽  
M. Gelnar
Keyword(s):  
Water Pollution ◽  
Czech Republic ◽  
Comparative Study ◽  
Environmental Stress ◽  
Eastern Europe ◽  
River Systems ◽  
Structural Alterations ◽  
The Family ◽  
Different Levels

AbstractA comparative study has been made of the haptoral morphology of four species of diplozoon (Monogenea: Diplozoidae) from the gills of fish exposed to different levels of water pollution in two river systems in eastern Europe. An examination of the haptors of Paradiplozoon homoion (Bychowsky & Nagibina 1959), Paradiplozoon ergensi (Pejčoch 1968) and Paradiplozoon megan (Bychowsky & Nagibina 1959) from chub caught in the River Morava, Czech Republic and of Diplozoon paradoxum (Nordmann 1832) from bream recovered from the River Volga, Russia has revealed abnormalities to the attachment clamps. Two abnormal conditions were found: structural alterations to the attachment clamps and changes in the number of attachment clamps; these occurred both singly and in combination. A higher frequency of abnormal attachment clamps was found in diplozoons from fish caught in the more polluted localities of both rivers. The abnormalities have been recorded and their morphology compared in the light of conditions of environmental stress.

A comparative study of woolly mammoths from the Gravettian site Kraków Spadzista (Poland), based on estimated shoulder heights, demography, and life conditions

2018 ◽  
Vol 90 (3) ◽  
pp. 483-502 ◽  
Author(s):  
Gary Haynes ◽  
Janis Klimowicz ◽  
Piotr Wojtal
Keyword(s):  
Czech Republic ◽  
Comparative Study ◽  
Environmental Stress ◽  
Archaeological Site ◽  
Climatic Conditions ◽  
Upper Paleolithic ◽  
Mammuthus Primigenius ◽  
Life Conditions ◽  
Age Profile ◽  
Bone Abnormalities

AbstractThis article interprets the life conditions of woolly mammoths (Mammuthus primigenius) from the Upper Paleolithic archaeological site Kraków Spadzista in Poland. We propose that the mammoths’ irregular mortality profile (also known as age profile) was shaped over several decades by major death events, which serially depleted the youngest cohorts. Taphonomic data and comparisons with other Eurasian archaeological and nonarchaeological sites provide context for hypothesizing that the mammoth-bone assemblage was accumulated at least partly through opportunistic human hunting of the most vulnerable animals in mixed herds. Humans exploited heightened mammoth vulnerability during climatic stress periods, killing and butchering most of the animals, although some mammoths in the assemblage may have died from natural causes. The evidence for environmental stress affecting the mammoths includes paleoecological data about local climatic conditions, the abundant signs of mammoth-bone abnormalities in the assemblage, the relatively smaller size of adult female mammoths compared with those from the similarly dated archaeological site Milovice I (Czech Republic), and the unusually high proportion of juvenile mammoths in the assemblage.

scholarly journals Proactiveness, competitive aggressiveness and autonomy: a comparative study from the Czech Republic

Equilibrium ◽  
2016 ◽  
Vol 11 (3) ◽  
pp. 631 ◽  
Author(s):  
Ashiqur Rahman Rahman ◽  
Mehmet Civelek Civelek ◽  
Ludmila Kozubikova Kozubikova
Keyword(s):  
Czech Republic ◽  
Comparative Study ◽  
Entrepreneurial Orientation ◽  
Small And Medium Enterprises ◽  
Three Dimensions ◽  
The Czech Republic ◽  
Competitive Aggressiveness ◽  
Medium Enterprises ◽  
Medium Firms ◽  
Different Levels

The purpose of this comparative study is to explore the differences in the entrepreneurial orientation (EO) between micro versus small and medium enterprises (SMEs). We have selected three dimensions of EO (proactiveness, competitive aggressiveness and autonomy) for our analysis. We have analyzed the data collected from 1141 respondents during the period of 2015 from 14 regions of the Czech Republic, which consists of 740 micro firms and 401 small and medium firms. Empirical results of our paper show significant differences between micro versus small and medium enterprises in terms of proactiveness and autonomy. However, we can only partially confirm that micro firms are statistically different from the SMEs in terms of competitive aggressiveness.  Thus, our paper enables  better understanding of the EO from the firm size perspective, when they have different levels of resources. 

Comparing Post-communist Authoritarianism in Russia and China

2018 ◽  
Author(s):  
Cheng Chen
Keyword(s):  
Comparative Study ◽  
East Asia ◽  
Eastern Europe ◽  
Case Studies ◽  
Single Case ◽  
Full Range ◽  
Geographical Area ◽  
Context Sensitive ◽  
Elite Politics ◽  
Significant Divergence

The studies of post-communist Russia and China have traditionally been dominated by single-case studies and within-region comparisons. This chapter explores why the CAS of post-communist Russia and China is difficult, why it is rare, and how it could yield significant and unique intellectual payoffs. The cross-regional comparative study of anti-corruption campaigns in contemporary Russia and China is used as an example in this chapter to argue that a well-matched and context-sensitive comparison could reveal significant divergence in the elite politics and institutional capacities of these regimes that would otherwise likely be obscured by single-case studies or studies restricted to one single geographical area such as “Eastern Europe” or “East Asia.” By breaking Russia and China out of their respective “regions,” the CAS perspective thus enables us to better capture the full range of existing diversity of post-communist authoritarianism.

scholarly journals Differences in the perception of parental involvement in homework depending on the level of student motivation

2015 ◽  
Vol 5 (3) ◽  
pp. 313-323
Author(s):  
Bibiana Regueiro ◽  
Susana Rodríguez ◽  
Isabel Piñeiro ◽  
Iris Estévez ◽  
Mar Ferradás ◽  
...  
Keyword(s):  
Intrinsic Motivation ◽  
Family Involvement ◽  
Family Environment ◽  
Student Motivation ◽  
Parental Support ◽  
Parental Control ◽  
School Students ◽  
School Work ◽  
The Family ◽  
Different Levels

The main purpose of this work is to check if the student motivation is an important factor in their perception of family involvement on homework. This is to check the relationships between different levels of intrinsic motivation towards school work of students in secondary and their perceptions of parental support and the type of feedback provided by their parents to homework, including the latter parental support and parental control. The sample consists of 730 (43.4% male; 56.6% female) of Secondary School students (12 to 16). The results show that higher levels of intrinsic motivation are associated with a higher perception of students regarding parental accompaniment to do homework and parental control and support them. We conclude, therefore, that student motivation is a factor of great importance to the involvement of the family environment and, more specifically, for the support and feedback provided by parents regarding homework.

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