The paper deals with the relationship between Emile Durkheim´s sociology and the contractualist tradition of political philosophy, represented here pricipally by Thomas Hobbles. Its aim is to show that Giddens´s strict rejection of Parsons´s claim according to which Durkheim has reopened in his work the "Hobbes´s problem of order", should not be accepted as such, because it´s radicality hides that what is the value in Parsons´s thesis. As we argue, Parsons has the merit of noticing that Hobbes and Spencer, who - in respect of their social philosophies - are usually seen as opposed, appear to be close to each other when they are considered by Durkheim as to the conception of the society their philosophies yield. Yet Durkheim´s sociology is an endeavour to conceive the society independently of the state, and thus, inversely, to emancipate the state from the society, so that it can be entrusted with a different function other than the guarantor of the social order. and Jan Maršálek.
Productivity of most improved major food crops showed stagnation in the past decades. As human population is projected to reach 9-10 billion by the end of the 21st century, agricultural productivity must be increased to ensure their demands. Photosynthetic capacity is the basic process underlying primary biological productivity in green plants and enhancing it might lead to increasing potential of the crop yields. Several approaches may improve the photosynthetic capacity, including integrated systems management, in order to close wide gaps between actual farmer’s and the optimum obtainable yield. Conventional and molecular genetic improvement to increase leaf net photosynthesis (P N) are viable approaches, which have been recently shown in few crops. Bioengineering the more efficient CC4 into C3 system is another ambitious approach that is currently being applied to the C3 rice crop. Two under-researched, yet old important crops native to the tropic Americas (i.e., the CC4 amaranths and the C3-CC4 intermediate cassava), have shown high potential P N, high productivity, high water use efficiency, and tolerance to heat and drought stresses. These physiological traits make them suitable for future agricultural systems, particularly in a globally warming climate. Work on crop canopy photosynthesis included that on flowering genes, which control formation and decline of the canopy photosynthetic activity, have contributed to the climate change research effort. The plant breeders need to select for higher P N to enhance the yield and crop tolerance to environmental stresses. The plant science instructors, and researchers, for various reasons, need to focus more on tropical species and to use the research, highlighted here, as an example of how to increase their yields., M. A. El-Sharkawy., and Obsahuje seznam literatury