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Abstract

In the present investigation a cylindrical electrostatic precipitator was built into a cyclone's outlet tubes, and was tested at various dusts and voltages. It has been found that the penetration (the unremoved fraction of the dust) for the airborne particles (d < 10 mm) in the case of working built in electrostatic precipitator, decreased to 5–10% of the penetration of the (only) mechanical cyclone operation. The penetration data is given at various dusts and voltages. All are proving that the method is working satisfactorily. If the voltage was smaller than the on set voltage of the discharge, the better performance could be observed. It means that with electric field it is possible to utilize the tribo-charge of the dust particles caused by the collision with the wall of the cyclone.

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Putative inhibitory effect of ‘Candidatus Phytoplasma mali’ 1/93 mild strain was tested under greenhouse conditions against the related ESFY and the distantly related STOL and AAY strains of ‘Candidatus Phytoplasma prunorum’, ‘Candidatus Phytoplasma solani’ and ‘Candidatus Phytoplasma asteris’, respectively, which are responsible for serious damages and yield losses in fruit orchards across Europe. A consequent decrease of the DNA amount of the virulent GSFY strain analysed by PCR and Real-Time PCR could be observed when the plants were preliminary immunised by 1/93 strain. The cross-protection phenomenon proved to be effective between closely related strains, but no inhibition occurred among distantly related strains due to preliminary infection. Our results support that immunization with a mild, antagonist strain can be of phytopathological relevance in phytoplasmal researches.

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This paper proposes an explanation of the apparent scope inversion attested in sentences pronounced with a rise fall intonation contour. It argues that a left-peripheral quantifier pronounced with a (fall-)rise is in topic position (Spec, TopP). A topic phrase must refer to an individual already present in the domain of discourse-that which will be predicated about in the sentence. Non-individual-denoting expressions, among them quantifiers, can also be made suitable for the topic role if they are assumed to denote a property which the rest of the sentence predicates some higher-order property about. A quantifier functioning as a contrastive topic denotes a property of plural individuals, and its apparent narrow scope arises from the fact that it is considered to be a predicate over a variable inherent in the lexical representation of the verb.

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Abstract

The degree of soil pollutants in the Dunaújváros area has been monitored regularly at 10 sampling points of the town from the upper 0–20 cm and lower 20–40 cm layers of the soils. The quantity of some organic (PAH, TPH) and inorganic (toxic metal) pollutants were determined by GC-MS and ICP analyzation. Microbial status, such as the total cultivable bacteria (CFU) and total catabolic enzyme activity, measured by fluorescein diacetate analysis (FDA) were also estimated. The area of the industrial town could be divided into more and less contaminated regions, although the measured pollutants were far below the estimated permissible limits. However, at some of the more polluted soils even triple amounts of contaminants could be measured compared to the lesscontaminated sites. Among inorganics the Zn microelement reached the highest levels (average is about 100 mg·kg−1 soil), which could be related to the heavy industrial activity. A positive correlation appeared among the organic and inorganic pollutants and also between the pollutants and the measured enzymatic values. The enhanced FDA activity was found at the most contaminated sites preceding the potential “loss of function” on a long-term basis. The fast and reliable microbial parameter could be suggested as further regular monitoring tool.

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A destructive seed-borne pathogen, formerly described as Pleospora papaveracea affects opium poppy (Papaver somniferum L.) plants, grown in Hungary, causing considerable qualitative and quantitative losses. The symptoms of the disease were frequently observed in the field between 1999 and 2006. Seventeen Hungarian isolates were obtained from poppy and cultures were established on malt extract agar from naturally infected seeds, diseased foliage, pods and stem. The pathogens proved to be Crivellia papaveracea and a distinct taxon, Brachycladium papaveris based on morphological characterization of conidia, conidiophores and cultures, moreover molecular investigation of the ITS region. Significant morphological differences were observed among the isolates originating from distinct plant parts, however, cultural characteristics were similar. Molecular studies revealed that morphological and cultural differences or similarities do not correspond with taxonomic position of the isolates. Morphological variation of the isolates mainly depended on their origin and might be explained with the differences of microclimatic conditions.

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Acta Botanica Hungarica
Authors: E. Farkas, Á. Kiss, G. Fehér, B. Bolla and E. Farkas
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Whereas it is a well-established fact that young children can perform intuitive addition and subtraction, it is an open question whether they are capable of multiplicative operations on sets before receiving formal training. Earlier studies devoted to the study of intuitive arithmetic sought for evidence of intuitive multiplication in children’s ability to distinguish proportional relations between quantities and numerosities. This paper claims that multiplication operations are present in children’s everyday communication, in their understanding and producing sentences with two numerical quantifiers and a distributivity marker such as the Hungarian Mindhárom gyerek két autóval játszik ’Every one of three kids is playing with two cars’, and Három gyerek két-két autóval játszik ’Three kids are playing with two cars apiece’. The paper gives account of an experiment testing how 5–7-year-old Hungarian children with no training in arithmetic operations interpret such sentences. The experiment shows that they have access to the multiplicative readings of distributive constructions; they not only accept them as true but at the age of 6–7 they can also actively compute the product of multiplication. The results also outline the acquisition path of multiplication, showing that children first multiply sets of concrete objects, then they represent the objects by their fingers, before they learn to manipulate sets mentally. Our results highlight the fact that language and mathematics are intertwined not only on the lexical level. Grammatical operations involving quantified expressions, among others, encode logical or mathematical operations on sets. Even if linguistic encoding is often ambiguous, grammatically encoded mathematical operations pave the way for abstract mathematics.

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