Rapid and sensitive determination of phenol in honey by high-performance liquid chromatography with fluorescence detection.

The objective of this research was to develop a novel high-performance liquid chromatographic (HPLC) method involving a simple sample preparation procedure for the rapid, low-cost, and sensitive quantitation of phenol in honey at levels of regulatory and practical importance. After proper dilution of honey with water, the samples were analyzed by a gradient HPLC system, using a reversed-phase column with fluorescence detection at excitation and emission wavelengths of 270 and 300 nm, respectively. The eluents applied were water-acetonitrile-85% orthophosphoric acid (10:10:0.

Inhibitory effect of ragweed (Ambrosia artemisiifolia L)-inflorescence extract on the germination of Amaranthus hypochondriacus L and growth of two soil algae.

In this study the ecological importance of common ragweed (Ambrosia artemisiifolia L.; Asteraceae) was investigated in in vitro bioassays as it is one of the most widespread annual weeds occurring on arable land in Hungary. Eight fractions were derived from ragweed inflorescence water extract by low vacuum column chromatography and their biological activity was investigated by Amaranthus hypochondriacus L.

Isolation of Bacillus strains from the rhizosphere of cereals and in vitro screening for antagonism against phytopathogenic, food-borne pathogenic and spoilage micro-organisms.

Bacillus strains were isolated from the rhizosphere of cereals in order to be used as natural biocontrol agents (BCAs). They were screened for antagonism in vitro against various test micro-organisms. The isolates showing antagonism were identified to species level.

[Myocardial infarct and diabetes mellitus: incidence, management and prognosis].

The authors analyse the data of the Myocardial and Diabetes Register, where 2436 diabetic patients (pts) and 1448 pts with acute myocardial infarction (AMI) were registered between 1st of January, 1992 and 31st of December 1994. In the history of diabetic patients previous AMI was present in 14.4% of the cases.

[Heart damage associated with cerebrovascular accidents].

The authors present a clinico-pathological study on 21 patients who died in acute cerebrovascular diseases. The main myocardial lesions were focal hemorrhages, contraction band necroses and myocarditis. The ECG abnormalities and the pathogenesis of the cardiopathy are discussed on the basis of their investigations and dates of references.