A glucomannan from Arum korolkovii
SummaryA glucomannan has been isolated from the tubers ofArum korolkovii Regel. It has been shown that the polysaccharide contains O-acetyl groups and consists mainly of (1 → 4)-β-linked aldohexopyranose units of glucose and mannose in a ratio of 1:1.6. The nonreducing ends of the glucomannan are glucose residues, and branching is localized at C2 and C3 of mannose.
Plant Mucilages. IX. The Location of the O-Acetyl Groups and the Nature of the Branches in Bletilla-glucomannan
Bletilla-glucomannan, the mucous polysaccharide isolated from Bletilla striata REICHENBACH fil., was found to contain 4.2% of O-acetyl group. The O-acetyl groups were located in position 3 of most of the glucose units. Methylation study provided the evidences that the polysaccharide is mainly composed of β-1→4 linked aldohexopyranose residues having a branched structure with 1→2 branch point at a part of mannose units, and mannose units occupy non-reducing terminal positions in the molecule.
Mite population density analysis of stored dried apricots in Turkey
The aim of this study was to determine the population density of mite species attacking stored dried apricots in Malatya, Elazig and Izmir regions of Turkey. Storage construction types and duration of storage were also considered. The samples were collected during 2000–2003 in the most important apricot producing areas (Malatya and Elazig) and the exporting center (Izmir). Frequency of occurrence and rates of intensity of infestations were determined (16.50% from Malatya, 3.19% from Elazig and 80.49% from Izmir). A total of 16 mite species belonging to 13 genera and 11 families were identified during the surveys. The pest species Carpoglyphus lactis (L.) (Astigmata: Carpoglyphidae) was the most abundant species recorded (69.14% of samples). The highest infestation value recorded was 15,534 mites per kg.