The effects of Moina artificial diet and nutrase xyla supplemented artificial diet on growth and survival of Clarias gariepinus larvae

An experiment was carried out to investigate the effects of Moina, artificial diet (55% CP) and nutrase xyla supplemented artificial diet on growth performances and survival rates of Clarias gariepinus larvae. A combination of Moina and artificial diet (with or without nutrass xyla) resulted in higher growth performance and survival rates during a 12-day nursing time with specific growth rates of 30.04-32.15% d super(-1) and survival rates of 87.5-90%. Best growth performance and survival rate was obtained with a combination of Moina and artificial diet supplemented with nutrias xylem. Feeding of Moina and artificial diet supplemented, with nutrias xyla alone to the larval led to a lower growth performance of 25.60-27.04% d super(-1). However, the survival rate of Monia of larvae fed a combination of Moina and artificial diet (with or without nutrias xylem supplementation) artificial diet without nutrias xylem addition proved relatively less suitable for larval rearing of Clarias gariepinus owing to a low survival rate of 69% and growth performance of 19.7% d super(-1). This study showed the feasibility of feeding a combination of Moina and nutrias xylem supplemented artificial diet to the larvae of Clarias gariepinu

A case of development of the parthenogenetic embryo in the ovary of Moina macrocopa Straus (Crustacea, Cladocera). [Translation from: Vest. Zool., Kiev 4, p. 86, 1971. ]

In a survey of histological preparations of several hundreds of Moina macrocopa Straus , one specimen was discovered, in the left ovary of which was found a parthenogenetic embryo. The short article includes an illustration of a transverse section of parthenogenetic female of Moina macrocopa

Piezoelectric resonance in Rochelle salt: the contribution of diagonal strains

Within the framework of two-sublattice Mitsui model with taking into account the shear strain $\varepsilon_4$ and the diagonal strains $\varepsilon_2$ and $\varepsilon_3$, a dynamic dielectric response of Rochelle salt X-cuts is considered. Experimentally observed phenomena of crystal clamping by high frequency electric field, piezoelectric resonance and microwave dispersion are described. It is shown that the lowest resonant frequency is always associated with the $\varepsilon_4$ shear modeComment: 17 pages, 6 figure

INNOVATIONS AND INFORMAL INSTITUTIONS:AN INSTITUTIONALIST APPROACH TO THE ROLE OF SOCIAL CAPITAL FOR INNOVATION

This article seeks to add to the debate on the role of informal institutions on innovations within firms. It argues that social capital arising from informal institutions can either help innovation or inhibit it within small enterprises. The paper attempts to provide a conceptual framework of how social capital fosters innovation within small firms. Like physical and human capital, social capital is also considered an explanatory factor in theories of innovation. Social networks become an essential element in the economic activity of the small businesses as they are more likely to rely on them to obtain information and learn about new techniques of productions due to their smaller resource base.Social capital, innovation, informal institutions, Pakistan

Major physical characteristics of Rochelle salt: the role of thermal strains

We compare the results for the related to the shear strain \epsilon_4 physical characteristics of Rochelle salt obtained within the recently developed modified two-sublattice Mitsui model that takes into account the strain \epsilon_4 and the diagonal components of the strain tensor \epsilon_1, \epsilon_2, \epsilon_3 with the results of the previous modification of the Mitsui model with the strain \epsilon_4 only. Within the framework of the model with the diagonal (thermal expansion) strains, we also reexamine the effects of the longitudinal electric field E_1 on the dielectric properties of Rochelle salt.Comment: 10 pages, 11 figure

Keys to families of Cladocera and to subfamilies, genera, species and subspecies of Macrothricidae and Moinidae [Translation from: Leningrad, Fauna SSSR, Crustacea 1 (3), 1971]

Identification keys to families of Cladocera and to subfamilies, genera, species and subspecies of Macrothricidae and Moinidae are given. This translation does not include ecological notes or illustrations