The effect of various environmental factors on the stability of aqueous solutions of amoxicillin-clavulanic acid combination in a veterinary water-soluble powder product was investigated. In the swine industry, the combination is administered via the drinking water, where both substances are quickly decomposed depending on several environmental factors. The degradation rate of the substances was determined in solutions of different water hardness levels (German hardness of 2, 6 and 10) and pH values (3.0, 7.0 and 10.0), and in troughs made of different materials (metal or plastic). Increasing the water hardness decreased the stability of both substances, amoxicillin being more stable at each hardness value than clavulanate. Amoxicillin trihydrate proved to be most stable at an acidic pH, while increasing the pH decreased its stability (P < 0.05). Maximum stability of potassium clavulanate was experienced at neutral pH, while its decomposition rate was significantly higher at acidic and alkaline pH values (P < 0.01). The stability of the amoxicillin-clavulanic acid combination depends mainly on the less stable clavulanate, although the effect of metallic ions significantly increased the decomposition rate of amoxicillin, rendering it less stable in metal troughs than clavulanate (P < 0.05). Therefore, the amoxicillin-clavulanic acid combination should be administered to the animals in soft water, at neutral pH and in plastic troughs.
Authors:Vera Takács, Ákos Máté and Sándor Gyula Nagy
The European Union does not have a comprehensive common tax policy and substantial changes in this specialized policy area are not likely in the foreseeable future. Albeit common rules, requirements, minimum rates for certain tax types were implemented in the last few decades, they barely limit the Member States in using their tax policies as one of the worthiest elements of their arsenal in increasing competitiveness or quite the contrary, to undermining their own international competitiveness inadvertently through a misguided tax policy. In this article, we put the tax policies of the Visegrad Group and the Eurozone core countries (Germany, Austria and the Netherlands), as well as changes in these policies under the magnifying glass, in terms of the impact of tax structure changes on economic growth and employment in the last decade.
Authors:Nagy Attila, Kerekes György, Erényi Ákos and Kocsis József
A primer vékonybélrák ritka, gyakran jellegtelen tüneteket okozó, nehezen kimutatható részét képezi az emésztőszervi daganatoknak. A rendszerint késői diagnózis idején az esetek felében már távoli áttétek vannak. A női nemben az emésztőszervi daganatok áttétei a máj és tüdő mellett sorrendben harmadikként az ovariumban alakulnak ki. Sokszor az eltávolított petefészek szövettani vizsgálata során derül fény a szekunder eredetre, tünetmentes primer daganat mellett. Az ovariumon talált daganat esetén a preoperatív kivizsgálás során gondolni kell arra, hogy a folyamat hátterében primer emésztőszervi daganat állhat.