Search

Start Over Coverage 81-89

2. Host specificity and metamorphosis of the glochidium of the freshwater mussel Unio tumidiformis (Bivalvia: Unionidae)

Creator:
Reis, Joaquim, Collares-Pereira, Maria João, and Araujo, Rafael
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Mollusca, larvae, encapsulation, juvenile, temperature, and Iberian Squalius
Language:
English
Description:
The glochidium larvae of freshwater mussels of the family Unionidae need to find suitable hosts to attach themselves and metamorphose into free-living juveniles. The specificity of the host-parasite relationship was investigated for the Iberian Unio tumidiformis Castro, 1885 by means of experimental infections and also by analyzing naturally infected fish. The process of encapsulation of glochidia was studied using scanning electron microscopy. Unio tumidiformis has proven to be an unusual host-specific unionid mussel, apparently parasitizing only fish of the genus Squalius Bonaparte, 1837. Successful encapsulation or complete metamorphosis was observed in five fish taxa: S. aradensis (Coelho, Bogutskaya, Rodrigues et Collares-Pereira), S. caroliterti (Doadrio), S. pyrenaicus (Günther), S. torgalensis (Coelho, Bogutskaya, Rodrigues et Collares-Pereira) and S. alburnoides (Steindachner) complex (only for the nuclear hybrids with at least one copy of the S. pyrenaicus genome). Complete metamorphose was achieved in 6 to 14 days at mean temperatures ranging from 21.8 to 26.1°C. The current study provides support for cell migration being the main force of cyst formation and shows the influence of potential host's genome in response to the infection process to determine the success of the metamorphosis.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

3. Locally spectrally bounded linear maps

Creator:
Bendaoud, M. and Sarih, M.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
local spectrum, local spectral radius, and linear preservers
Language:
English
Description:
Let L(H) be the algebra of all bounded linear operators on a complex Hilbert space H. We characterize locally spectrally bounded linear maps from L(H) onto itself. As a consequence, we describe linear maps from L(H) onto itself that compress the local spectrum.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

4. Research on cooling efficiencies of water, emulsions and oil

Creator:
Horák, Aleš, Raudenský, Miroslav, Pohanka, Michal, Bellerová, Hana, and Reichardt, Tilo
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
spray cooling, water cooling, emulsion cooling, oil cooling, and experimental
Language:
English
Description:
There are many areas in the steel and metallurgy industry where pure water cannot be used as a coolant. Lubrication and corrosion are the two main factors why spray cooling has to use different cooling liquids. A typical example is cold rolling of steel where emulsions are used or rolling of some non-ferrous metals where pure oils are used. Other metallurgical processes use water polluted by oil or containing mineral salts. The spray cooling efficiency of these coolants is different from the cooln slats. The spray cooling efficiency of these coolants is different from the cooling efficiency of pure water. This paper describes a research comparing the spray cooling by pure water to the cooling using water-base oil emulsions of different concentrations, cooling using oil, and cooling using polluted water. This comparison was done by the measurements of the cooling efficiency characterised by the heat transfer coefficient for identical pressure. and Obsahuje seznam literatury
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

6. Systémy pro skladování elektrické energie

Creator:
Zigler, Martin
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
fyzika, physics, skladování elektrické energie, kapacitory, supravodivé induktory, setrvačníky, electric energy storage systems, 6, and 53
Language:
Czech
Description:
Příspěvek podává přehled systémů určených pro skladování elektrické energie. Obsahuje základní popis funkčních principů, vhodných aplikací a trendů ve vývoji takových systémů. Následuje vzájemné porovnání jednotlivých systémů a diskuse jejich výhod a nevýhod., This article reviews various electric energy storage systems. The paper contains a basic description of functional principles of particular energy storage systems and also a comparison of different ways of how to cumulate and store electrical energy. Present applications and future trends in the developmnet of such systems are summarized in the article., Martin Zigler., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public