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Oļehnovičs D., atbildīgais par izd. / Resp. Ed ... - DU conference

Oļehnovičs D., atbildīgais par izd. / Resp. Ed ... - DU conference

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DAUGAVPILS UNIVERSITĀTES 53. STARPTAUTISKĀS ZINĀTNISKĀS KONFERENCES<br />

TĒZES<br />

ABSTRACTS OF<br />

THE 53 rd INTERNATIONAL SCIENTIFIC CONFERENCE OF DAUGAVPILS UNIVERSITY<br />

ievākti 2010. gada jūnijā, jūlijā, augustā un septembrī. Paraugi tika ievākti 4 vietās: Kraujā (10 km<br />

augšpus Daugavpils), pie Daugavpils notekūdeľu ieplūdes, 1,5 km lejpus Daugavpils<br />

notekūdeľiem, un pret Silupi (10 km lejpus notekūdeľu ieplūdes). Tika veikta zooplanktona<br />

kvalitatīvā un kvantitatīvā sastāva analīze. Pētot zooplanktona daudzveidību upes posmā no<br />

Kraujas līdz Silupei, tika konstatētas 3 zooplanktona organismu grupas: Rotatoria, Cladocera un<br />

Copepoda. Kopumā tika konstatētas 35 zooplanktona sugas, no tām 20 Rotatoria sugas, 12<br />

Cladocera sugas un 3 Copepoda sugas. Vislielākā zooplanktona sugu daudzveidība, 29 sugas, tika<br />

konstatēta <strong>par</strong>augu ievākšanas vietā 1,5 km lejpus Daugavpils notekūdeľiem. Izplatītākās sugas<br />

bija Keratella cochlearis, Keratella quadrata, Euchlanis dilatata, Nauplii. Analizējot zooplanktona sugas<br />

un skatot tās kā saprobitātes indikatororganismus, var secināt, ka pētītajā Daugavas posmā<br />

dominē β – mezosaprobitāte (vidējs piesārľojums), uz to norāda tādas zooplanktona sugas kā<br />

Keratella quadrata, Keratella cochlearis, Bosmina longirostris.<br />

Aleksandrs Petjukevičs, Nataļja Škute<br />

alexchemist@inbox.lv<br />

CHANGE OF ABSORPTION SPECTRUM OF PIGMENTS AND<br />

FLUORESCENCE EMISSION SPECTRUM OF LEAVES HYDROCOTYLE<br />

VULGARIS AT DIFFERENT SALT (NACL) CONCENTRATION.<br />

Key words: Hydrocotyle vulgaris, pigments, fluorescence emission spectrum, chlorophyll, NaCl<br />

The high concentration of salt ions can cause damage to cell membranes, inhibit the enzyme<br />

activity, and lead to a breach of a number of important physiological processes including<br />

photosynthesis. Absorption spectra of acetone extracts of pigments were measured after shortterm<br />

effects of different concentrations of salt (NaCl) per Hydrocotyle vulgaris, which grew in a<br />

climate camber in different variants. The concentration of chlorophyll A, B, and carotenoids in the<br />

leaf of Hydrocotyle vulgaris was determined. Fluorescence of cells is an effective method which<br />

allows for defining changes in a set of cell metabolites initially, directly in living cells even at<br />

insignificant damage. During this work, emissive fluorescence spectra of Hydrocotyle vulgaris<br />

leaves, that underwent influence of various salt (NaCl) concentrations, were also obtained.<br />

Fluorescence intensity F 490, F 680, F 710 and F 740 was determined. Data was statistically<br />

analyzed in ANNOVA.

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