PARTNERSHIP BETWEEN TEACHER AND SECONDARY SCHOOL STUDENT THROUGH LEARNING MATHEMATICS

This article examines secondary school student and teachers cooperation through learning mathematics. The aim of the study is to find out whether the teacher and student cooperation is a partnership. The partnership is viewed as a cooperation where involved work toward mutual goals. Secondary school student - teacher partnership is possible if the teacher trusts students and together with them chooses the learning objectives, the teaching aids and methods of learning. Students take responsibility for their choices and they are motivated to accomplish them if there is possibility to make a choice. The article deals with teachers' views on teaching and students' opinions about what helps and what interferes learning mathematics

Проект науково-технічної програми Міністерства освіти і науки Латвійської Республіки та Міністерства освіти і науки України

Izdevumā atspoguļota starptautiskā projektā «Migranti sabiedrībā: izaicinājumi izglītībā» veiktā pētījuma gaita un rezultāti. Projekts tapis Latvijas Republikas Izglītības un zinātnes ministrijas un Ukrainas Izglītības un zinātnes ministrijas Zinātnes Tehnoloģiju programmas ietvaros. Tā partneri ir Latvijas Universitāte un Ukrainas Nacionālā Dragomanova pedagoģiskā universitāte. Projekta ilgums - 2 gadi.Видання відображає прогрес та результати міжнародного проекту "Мігранти в суспільстві: проблеми в освіті". Проект реалізовано у межах Наукової програми Міністерства освіти і науки Латвійської Республіки та Міністерства освіти і науки України. Його партнерами є Латвійський університет та Український національний педагогічний університет імені М. П. Драгоманова. Тривалість проекту - 2 роки

Developing cognitive learning of secondary school students trough exploration in Mathematics classes

Darba mērķis ir izpētīt vidusskolēnu izziņas darbības veicināšanu, izmantojot pētniecības uzdevumus matemātikas mācībās. Pētījuma teorētiskajā daļā tiek analizēti: izziņas darbība no filosofijas, psiholoģijas un pedagoģijas aspektiem; vidusskolēnu vecumposms; pētniecības uzdevumu struktūra matemātikas mācībās un jautājums kā pētniecības uzdevuma daļa. Pētījumā tiek analizēta ESF projekta „Mācību satura izstrāde un skolotāju tālākizglītība dabaszinātņu, matemātikas un tehnoloģiju priekšmetos” pieredze pētniecisko uzdevumu izmantošanā atbalsta skolās un salīdzināta matemātikas mācību organizācija pētījuma grupā ar Lielbritānijā veiktā pētījumā iesaistīto divu skolu mācību organizācijas formām. Pētījuma empīriskajā daļā tiek analizēti novērojumi par vidusskolēnu iesaistīšanos matemātikas mācībās pēc pētniecisko uzdevumu risināšanas. Atslēgvārdi: izziņas darbība, vidusskolēns, pētniecības uzdevumi, jautājumi, matemātikas mācības.The aim of the research is to investigate developing cognitive learning of secondary school students through exploration in mathematics classes. The theoretical part of the research contains analysis of cognition from philosophical, psychological and pedagogical aspects; young adult age, structure of exploration problems in mathematics classes and questions as part of inquiry learning. There is analysis of experience of using research activities in the pilot – schools of ESF project “Curriculum development and in-service training of teachers in science, mathematics and technology” and compared organization of learning process in the cases study with the conducted case studies in the UK. The empirical part of research contains analysis of observations about engagement of secondary school students in learning mathematics after carrying out exploration in mathematics classes. Key words: cognition, young adults, exploration problems, question, learning mathematics

Фитопланктон как показатель качества среды Рижского залива

Publicēto darbu kop

Sintētiskā hormona 17α-etinilestradiola ietekme uz dažādu trofisko līmeņu ūdens organismiem

Sintētiskais hormons 17α-etinilestradiols (EE2) ir viena no orālās kontracepcijas galvenajām komponentēm. Nokļūstot ūdens vidē, EE2 iedarbojas uz ūdens organismu hormonu receptoriem un ietekmē to augšanu, attīstību un vairošanos. Pētījumā tiek noskaidrots kā EE2 ietekmē dažādu trofisko līmeņu organismus un tiek novērtēts tā toksiskums. Kā testa organismi tika izmantoti attiecīgus trofijas līmeņus pārstāvoši testa organismi: fitoplanktona organismi – Desmodesmus communis, zooplanktona organismi – Daphnia magna, zoobentosa organismi - Hyalella azteca. Tika veikti akūti un hroniski toksicitātes testi. Tika konstatēts, ka paaugstinātas EE2 koncentrācijas vidē būtiski ietekmē ūdens organismu spēju dzīvot, attīstīties un vairoties. Eksperimentu rezultāti parāda, ka pēc jutības pret EE2 testorganismi sakārtojas sekojošā secībā: Desmodesmus communis > Hyalella azteca > Daphnia magna

Impact of Synthetic Hormone 17α-Ethinylestradiol on Growth of Microalgae Desmodesmus Communis

Microalgae has recently attracted much attention as a feedstock for biogas. Using wastewater as microalgae nutrition is a way how to produce algal biomass with low cost and minimum impact on environment. However, wastewater often is polluted with chemicals like pharmaceuticals which are among the commonly used chemicals in everyday life. The present study was aimed at the toxicity evaluation of a commonly used synthetic hormone, 17α-ethinylestradiol, using freshwater green algae Desmodesmus communis as a biotest organism. Parameters like healthy cell number and photosynthetic activity were determined and used to assess the toxicity. Lowest Observed Effect Concentration (LOEC) and 50% Effective Concentration (EC50) values were calculated for the parameters at different incubation times. It was found out that 17α-ethinylestradiol affects algal cell ability to grow, inhibits cell division and reduce photosynthetic processes in algal cells. Our research shows that inhibitory effect on growth of green algae D. communis start on concentration below 10 µg L-1 (4-8 µg L-1). Concentrations in the range of concentration 80-100 reduce growth by 50%, but concentrations 100-500 µg L-1 induce 100% reduction of growth rate and even calls initial algal cell destruction. Presence of EE2 in wastewater used for algal growth can affect productivity of a microalgae aquaculture

Nitrogenous organic substances as potential nitrogen sources, for summer phytoplankton in the Gulf of Riga, eastern Baltic Sea

To investigate whether uptake of dissolved organic compounds might favour the growth potential of toxic cyanobacteria and dinoflagellates, surface water was collected in late July 1997 in the Gulf of Riga, and enriched with different nitrogen sources. (1) Organic substances were added (25 mu M N) under P-, Si- and Fe-replete conditions. Urea sustained a biomass increase (protein content) 20% greater than that with NH sub(4) super(+). Glycine, hypoxanthine and putrescine gave only 50% of the biomass obtained with NH sub(4) super(+). Glutamic acid and spermine supported growth in only one case each, and guanine in none. (2) The >1000 dalton fraction of dissolved organic matter (DOM) taken from the Daugava River was provided at concentrations of 5, 15 and 49 mu M dissolved organic nitrogen (DON); P, Si and Fe were not added, except in the control. DON sustained algal growth as much as ammonium and NO sub(3) super(-), but data were somewhat inconsistent. (3) The cyanobacterium Microcystis aeruginosa was cultured in filtered (0.45 mu m) water supplemented with organic substances (25 mu M N) and DOM (15 mu M DON), under P-, Si-, and Fe-replete conditions. Growth with urea, glycine, hypoxanthine, putrescine or spermine ranged between 145 and 175% of that obtained with NO sub(3) super(-). That 15 mu M DON sustained a biomass increase representing only 70% that gained with NO sub(3) super(-) might be explained by the different relative concentrations of DON and NO sub(3) super(-). Altogether, it is inferred that urea is an important potential nitrogen source for summer phytoplankton as a whole, while dissolved free amino acids (DFAA) and DON of terrestrial origin may partly sustain growth in some individual species

Nutrients limiting the Algal Growth Potential (AGP) in the Gulf of Riga, eastern Baltic Sea, in spring and early summer 1996

In May, June and July 1996, samples wcre collected along one transect greatly influenced by river discharge (eastern side of the gulf), along one transect slightly influence by river discharge (western side), at one station Iocated in the mouth of the main river (River Daugava), at one station located in the center of the Gulf and at several nearshore locations of the western side. Ratios of rnolecular concentrations of in situ dissolved ioorganic nitrogen, phosphorus and silicon, as weIl as enrichment bioassays were llsed to dctcrrnine which nutrient (s) lirnited the potential biomass of phytoplankton. Both comparison of (NO.d-N02+NJ.L): P04 (DIN: DIP) values with Redfic1d's ratio and bioassay inspection led to the sarne conclusions. Phosphorus was clearly the nutrient most limiting for the potcntial biornass of test species in nitrogen- rich waters, which occurred in mid spring, in the upper layer of the southern-eastern part of the Gulf which is greatly influenced by river discharge. In late spring, with the decrease of the total DIN reserve, nitrogen and phosphorus showed an equallimiting role. In deeper layers of this area and out of the river plume (western side and central part of the gulf), nitrogen was the limiting nutrient. In summer, whcn river discharge was the lowest, a11 DIN concentrations but one ranged between 1.6 and 2.6 µM, and the whole area was nitrogen-limited for both the cyanobacterial and the algal test strains. In 74% of the samples for which nitrogen was the limiting nutrient, phosphorus was recorded to be the second potentially limiting nutrient. In contrast, silicon never appeared as limiting the growth potential of either Microcystis aeruginosa or Phaeodactylum tricornutum; phosphorus was the limiting nutrient when DIN: Si03 values were >1 (in May), but DIN: Si03 was 1, en mai, et <1 en juin et juiliet quand l'azote était limitant. Les auteurs estiment que l'accroissement en importance du rôle silicium pour la compétition interspécifique au sein du phytoplancton au bénéice des espéces toxiques non silicifiées récemment mis en exergue pour d'autres eaux côtiéres n'est pas encore significatif pour le golfe de Riga. Le fer est apparu dans la liste des nutriments limitants pour 12% des test. En outre, bien que les valeurs absolues soient entâchées d'imprécision, certains résultats indiquent qu'une faction non néligeable de l'azote prélevé (~4 !lg-atom N 1- 1 ) pourrait l'avoir été sous une forme organique. Les auteurs suggérent de prêter attention â ces deux facteurs pour les recherches â venir