scholarly journals Save your host, save yourself? Caste-ratio adjustment in a parasite with division of labor and snail host survival following shell damage

2018 ◽  
Vol 8 (3) ◽  
pp. 1615-1625 ◽  
Author(s):  
Colin MacLeod ◽  
Robert Poulin ◽  
Clément Lagrue
Keyword(s):  
Division Of Labor ◽  
Snail Host ◽  
Shell Damage ◽  
Caste Ratio

Ultrastructural analysis of “Sensory” surface nerve endings and “putative” neurotransmitter sites in Schistosoma mansoni Miracidia

1989 ◽  
Vol 47 ◽  
pp. 962-963
Author(s):  
Betty Ruth Jones ◽  
Steve Chi-Tang Pan
Keyword(s):  
Nervous System ◽  
Life Cycle ◽  
Schistosoma Mansoni ◽  
Snail Host ◽  
Complex Life Cycle ◽  
Rational Approach ◽  
Effective Control ◽  
The Social ◽  
Social And Economic Development ◽  
Basic Biology

INTRODUCTION: Schistosomiasis has been described as “one of the most devastating diseases of mankind, second only to malaria in its deleterious effects on the social and economic development of populations in many warm areas of the world.” The disease is worldwide and is probably spreading faster and becoming more intense than the overall research efforts designed to provide the basis for countering it. Moreover, there are indications that the development of water resources and the demands for increasing cultivation and food in developing countries may prevent adequate control of the disease and thus the number of infections are increasing.Our knowledge of the basic biology of the parasites causing the disease is far from adequate. Such knowledge is essential if we are to develop a rational approach to the effective control of human schistosomiasis. The miracidium is the first infective stage in the complex life cycle of schistosomes. The future of the entire life cycle depends on the capacity and ability of this organism to locate and enter a suitable snail host for further development, Little is known about the nervous system of the miracidium of Schistosoma mansoni and of other trematodes. Studies indicate that miracidia contain a well developed and complex nervous system that may aid the larvae in locating and entering a susceptible snail host (Wilson, 1970; Brooker, 1972; Chernin, 1974; Pan, 1980; Mehlhorn, 1988; and Jones, 1987-1988).

Competition Policy under Economic Crisis

2009 ◽  
pp. 54-69 ◽  
Author(s):  
A. Shastitko ◽  
S. Avdasheva ◽  
S. Golovanova
Keyword(s):  
Division Of Labor ◽  
Economic Crisis ◽  
Industrial Policy ◽  
Competition Policy ◽  
Transition Economy ◽  
Economic Recession ◽  
Price Rigidity ◽  
Key Factor ◽  
Policy Measures ◽  
The Impact

The analysis of competition policy under economic crisis is motivated by the fact that competition is a key factor for the level of productivity. The latter, in its turn, influences the scope and length of economic recession. In many Russian markets buyers' gains decline because of the weakness of competition, since suppliers are reluctant to cut prices in spite of the decreasing demand. Data on prices in Russia and abroad in the second half of 2008 show asymmetric price rigidity. At least two questions are important under economic crisis: the 'division of labor' between pro-active and protective tools of competition policy and the impact of anti-crisis policy on competition. Protective competition policy is insufficient in transition economy, especially in the days of crisis it should be supplemented with the well-designed industrial policy measures which do not contradict the goals of competition. The preferable tools of anti-crisis policy are also those that do not restrain competition.

The Division of Labor as Social Interaction

1976 ◽  
Vol 23 (3) ◽  
pp. 304-313 ◽  
Author(s):  
Eliot Freidson
Keyword(s):  
Social Interaction ◽  
Division Of Labor

«Roses» and «thorns» of the international division of labor: dialogue with history and modernity

2020 ◽  
Vol 19 (3) ◽  
pp. 209-221
Author(s):  
E. A. Ponuzhdaev ◽  
Tatiana A. Shpilkina
Keyword(s):  
Division Of Labor ◽  
Social Structures ◽  
The European Union ◽  
International Division ◽  
National Division ◽  
World Markets ◽  
European Union Countries ◽  
Key Indicators ◽  
Trade Wars ◽  
International Division Of Labor

The authors considered historical and topical issues of the international division of labor (MRT). The analysis and parallel of MRI data by ancient scientists, researchers, scientists and experts of the XVIII, XIX, and XXI centuries. On the example of the European Union countries Greece, Spain and Portugal, the analysis of GDP, wages and unemployment as key indicators that characterize the economy of countries is carried out. The historical «cycle» of social structures is given and the dynamics of the ratio of the upper (B), middle (C) and lower (H) classes is shown. It shows the current problems of world markets, taking into account sanctions, trade wars and the consequences of the pandemic. Prospects for the national division of labor (NDT) are defined.

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