Lactulose is recognized world-wide as one of the most clinically reliable bifidogenic factor. Lactulose is used in various types of food products (infant formula, baby food, confectionary, soft drink, milk products) and also pharmaceutically to improve hepatic encephalopathy and constipation (Mizota, 1996; Strohmaier, 1998). The object of this study was to investigate the influence of concentration of lactulose on growing Bifidobacterium lactis in milk. A bifidogenic lactor, lactulose was added (1, 2, 3, 4 and 5%) into 100g of milk. The milk samples were inoculated with Bifidobacterium lactis (BB-12, Chr. Hansen, Denmark) and incubated at 38 deg C for 16 hours. Lactulose as a prebiotic influences the growth of bifidobacteria in milk. Trends of development of acidity in the milk samples with or with out lactulose were not similar. Laboratory studies have generally shown that growth of Bifidobacterium lactis in milk depends on the concentration of lactulose. Data on the final cell count in fermented milk indicates that increasing the lactulose concentration from 2% to 3% enhanced the growth of the Bifidobacterium lactis, whereas no significant difference between lactulose concentration 4-5% and control sample was observed. Present result furthermore indicate that finding combination of prebiotic and probiotic pairs where the prebiotic would benefit the specific probiotic strain, e.g. during production and formulation into foods, is not a simple task.

To select new sea-buckthorn hybrids and forms with increased content of biologically active substances, breeding work with sea-buckthorn hybrid seedlings is carried out in Latvia. The aim of this research was to study the vitamin C and total carotenes content in sea-buckthorn juice and its stability at different pasteurization temperatures with several durations. For study 6 sea buckthorn hybrids from 3 hybrid families were used. Vitamin C and total carotenes were determined in freshly made juice and with pasteurization at 65 deg C, 75 deg C and 85 deg C for 30, 20 and 10 minutes respectively. After processing the data obtained, it was found that vitamin C and total carotene content did not alter significantly depending on pasteurization temperature and duration. For further research 3-sea-buckthorn hybrids have been selected with the highest content of vitamin C and total carotenes.

Turkey is a mountainous country with many high mountains. Recent estimations show that there are approximately 20.7 million ha of forested area in Turkey, covering 25.8% of the total land area. However, little over half of this forested area is classified as unproductive (51.7%). Artvin is located in the North Eastern Black Sea part of Turkey and is the home of a very rich biological diversity. Forests in Artvin region are in different climatic zones - from temperate climate to continental climate zone - and there are several vegetation zones in the region which ranges from sea level to the altitude of 3500 m. A Scotch pine (Pinus sylvestris L.) plantation, planted in 1996 in the alpine zone in Artvin-Ardanuc region, was investigated. The size of study area was 40 ha and this research was done on 12 sample plots. There were 50 Scotch pine seedlings on each sample plot. Height and root collar diameter of the seedlings were measured. The mean slope was the same (60%) on the sample plots, and the effects of exposure and altitude significantly affected the height and root collar diameter growth of the seedlings (P is less than 0.05). It was determined that increased altitude is associated with decreased height growth and root collar diameter of the seedlings.

The term "competence" has not been clearly defined in the literature. Two meanings of the term have been identified. One refers to the outputs or results of education (training), but other - to the inputs or underlying attributes needed for a person to demonstrate competent performance. Each meaning has been used to describe both individual and organizational competences. A classification of the meanings of competence is given to show that the term has several meanings depending on the purpose for which it is used. Although competence is an important concept in education, it is unclear what competence is. Constructivism is a way out of the competence confusion - we don't search for one absolute true definition, but do use the competence concept for our own purposes. At the end of article a description (definition) of competence is given. This definition is appropriate to define inputs for undergraduate programmes and to improve student's lifelong and life wide learning competences while studying undergraduate study programmes.

Nowadays the industrial society changes over to the information society. The introduction of elements from distance education and e-studies is an effective means in updating traditional education system in higher educational establishments of Latvia. Due to the decrease of the amount of contact classes and increase of the share of independent work, the version of studies of a mixed-mode type (the introduction of separate elements from the distance education and e-studies in traditional subjects of studies) is the most appropriate types of education in higher educational establishments of Latvia. Hence new study materials elaborated exactly to cover the needs of independent active studies with feedback are required. The techniques type of study materials has to be acceptable for students of different age groups. The aims and tasks are to be clearly defined in the study materials for distance education and e-studies. Tests and examinations are carried out to state whether the aims and tasks are fulfilled. The objective of tests and exams is not a severe evaluation of student knowledge but the analysis of made mistakes. With the introduction the elements of distance education and e-studies in the process of teaching and learning of subjects in higher educational establishments, the students from towns and country will have greater possibilities to acquire knowledge at the speed, time and place most suitable for them.

The purpose of arts education at university is to create students' attitude to five forms of art - literature, drama, dance, music, and visual arts. As a study object, the art an integral part of education and perception of art is the result of cognition of the surrounding environment. A.Dauge (1868-1937) and J.A.Students (1898-1964) observed that arts education is finding out the question of integrity the logically rational and the emotionally experienced in the system of counterbalancing mind and feelings. At the beginning of the 21 century, as the paradigm of education is changing, the opinion also changed about what makes a knowledgeable and socially valuable person. In order to promote the development of one's personality self-fulfilment pedagogues are called for introducing certain changes which are contributing to the opening up of their students. University students are going through the process of evaluation of an interpretation of opera as recorded performance on a video-type and in live performance on the opera house stage. It makes their opinion based on well - grounded argumentation and personally valuable self - evaluation. The last is functioning as the regulating mechanism for learning the properties of arts in the context of developing the human personality. The opera performance on the stage is the live communication with a different culture heritage and people are going to performances to be immersed in art values. Usually the repertoire is hosen for visiting the opera house as an interesting and enjoyable entertainment for students. Such masterpieces as "The Magic Flute" of W.A.Mozart, "Flying Dutchman" by R.Wagner, "Aida" and "La Travolta" by G.Verdi are actually stimulated the students discover of the artwork. Understanding of opera art increases the students' knowledge, emotional experience, interest and positive attitude to high art values. Arts education as intelligent cultural assessment is the dominating purpose of the teaching-learning process.

Field trials were carried out on organic farming fields at the Research Institute of Agriculture of the Latvia University of Agriculture (LLU). The influence of harrowing (without harrowing, before emergence, at the stage of tillering, before emergence and at the stage of tillering) depending of pre-crop (red clover, winter rye for grain, bare fallow and green manure) and use of stable manure (60 t haE-1 or without) on the weediness and yield of spring barley 'Sencis' was tested during 2003-2004. In spring barley, 18 species of weeds were established at the stage of earing during 2003-2004. The most widespread of perennial weeds were Elytrigia repens (L.) Nevski and Sonchus arvense L. The dominant annual weeds were Chenopodium album L., Stellaria media L., Capsella bursa-pastoris L., Polygonum spp., and Matricaria inodorum L. The number of annual weeds at the stage of earing differed during the years 50-160 (in 2003) and 33-118 (in 2004) annual weeds per mE-2. The influence of harrowing on the number of annual weeds was different during the testing years. The influence of harrowing on the grain yield was negligible during 2003 and 2004.

The article discusses investigations in a flat rectangular contact area of two elastic solids (brake friction lining and disc) using a theoretical method. The solids are in free as well as in forced movement. The investigations have resulted in correlations describing deformation and stiffness parameters of solid flat joint in different loads: transference of the centre of cross section delta0 the angle of turning phi of one solid in relation to the other (as a result of friction lining deformation), and tension sigmax in any cross section of the contact area. The results of the investigations make it possible to analyze the stiffness of the contact of solids, test the strength of the contact areas, optimize the contact are of solids, and prognosticate even wear out of friction lining.

Systainable energy systems and food security can be obtained in rural areas by usage of renewable energy resources and development of agro-ecotechnologies. Substitution of fossil feedstock for energy and raw materials by biomass is important measure also for greenhouse gas (GHG) emission mitigation. The article presents investigation of reed biomass size reduction processes flattening and cutting. The necessity to reduce the size of common reeds (Phragmites australis) to particles smaller than 3 mm for solid biofuel production is determined by compaction properties of biomass. It was stated that unflattened reed stem cutting energy consumption is 2 times more than flattened stem cutting energy. There are no sufficient differences in the energy consumption values for single flattened reed stalk cutting with different shaped knives. The average difference is approximately 2.4 kJ square m with knife edge angles 90 deg and 20 deg.

The studies were made on the surface water and groundwater sources, the existing and future water production yields of the Riga city. The forecasts about water demand in Riga by year 2010 are estimated as 200 000 m**3 dE-1, with a variation coefficient of 1.13. Total water yield is estimated as 410 000 m**3 dE-1, with a storage coefficient of 2.05, which is considered as sufficient. It is proposed that in future 50% of drinking water for Riga will be abstracted from groundwater and 50% will be produced in the Daugava surface treatment plant.