1,344 Works

Particle size distribution analysis of pine sawdust: comparison of traditional oscillating screen method and photo-optical analysis

V. Chaloupková, T. Ivanova & A. Muntean
Particle size and particle size distribution (PSD) are crucial parameters which affect properties of particulate and agglomerated materials, and have an impact on a quality and utilization of a final product. The aim of this paper was to determine PSD as well as to assess dimensional features of pine sawdust fractions via mechanical sieve analysis and photo-optical analysis. The first one is a traditional and standard method taking into account only one parameter of particle...

Environmental risk assessment studies on new plant protection products which have been elaborated from coniferous tree bark

L. Jankevica, O. Polis, A. Korica, I. Samsone, V. Laugale & M. Daugavietis
Nowadays there are still various chemical pesticides being applied in the course of ensuring plant protection. Since 2010, we have been working on the development of new, environmentally-friendly plant protection products which will provide an effective tool against pathogenic fungi and bacteria which cause disease in crop plants. The specific aim of this study was to evaluate a risk assessment for new plant protection products that have been elaborated on the basis of coniferous tree...

Agronomic evaluation of a Colombian passion fruit (Passiflora edulis Sims) germplasm collection

C.H. Galeano Mendoza, I. Cerón-Souza & L.V. Arango
Passion fruit (Passiflora edulis Sims) is one of the most promissory crops in Colombia with approximately 7,400 ha cultivated, an average production of 89,000 t and an average yield of 15 t ha-1. However, low yields as well as harvest problems including fruit quality, generate important losses, mainly due to lack of improved cultivars with particular characteristics for each market (fresh consumption, agroindustry) and specific adaptations to biotic and abiotic stress factors in producer areas....

Effects of Dormex (Hydrogen Cyanamide) on the performance of three seedless table grape cultivars grown under greenhouse or open - field conditions

I.Y. El Masri, Jad Rizkallah & Y.N. Sassine
Greenhouse cultivation of table grapes is still limited to some experimental trials at Lebanese coast. One major constraint facing this type of cultivation is the lack of enough chilling hours causing irregular bud - break and yield reductions. Dormex, with Hydrogen Cyanamide as active ingredient, is an effective mean for dormancy release adopted in warm winter regions. The work investigated separate and combined effects of two factors: greenhouse cultivation and Dormex application on vine buds...

Fatty acid composition in pork fat: De-novo synthesis, fatty acid sources and influencing factors – a review

K. Vehovský, K. Zadinová, R. Stupka, J. Čítek, N. Lebedová, M. Okrouhlá & M. Šprysl
Fats are among the basic nutrients the human organism needs as a source of energy, as well as to grow and regenerate cells, tissues, and organs. Particularly animal fats, with their higher proportion of saturated fatty acids and low content of n-3 fatty acids, are often seen by the public as relatively undesirable food components. Fatty acid (FA) composition of pork is affected by many factors: genotype, breeding, gender and feeding methods. Numerous research teams,...

The effect of planting stock and soil scarification on forest regeneration

Andres Jäärats
The objective of the Doctoral thesis was to study and evaluate the quality of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies L.) planting stock grown with different technologies, determine their biometric indices and conformity with set quality standards, assess the survival and height growth formation of Scots pine and Norway spruce plantations established with different types of planting stock, and analyse the natural regeneration of coniferous and deciduous trees depending on soil...

Role of historical slash and burn cultivation in the development of cultural landscapes and forest vegetation in south Estonia

Pille Tomson
The objective of this PhD thesis was to estimate the effects of historical rotational slash and burn cultivation on the formation of southern Estonian cultural landscapes and forest vegetation. Slash and burn cultivation was practised in Northern and Central Europe until the 20th century. With regard to Estonia, previous studies have suggested that slash and burn cultivation resulted in soil depletion, podsolization and the formation of species-poor forest habitats. This research was based on land...

Analysis of gamma rays induced variability in lentil (Lens culinaris Medik.)

D. Tabti, M. Laouar, K. Rajendran, S. Kumar & A. Abdelguerfi
In this study, a lentil variety, Idlib-3, was subjected to 100 Gy (LD50) gamma-ray irradiation. At M2, mutant families were characterized for the most beneficial agronomic traits. High genotypic coefficient of variation, broad sense heritability and genetic advance of the traits such as seed yield per plant and hundred-seed weight indicated expression of additive gene action and confirmed the response at early generation selection. Total number of pods per plant had positive correlation and the...

Comparative characteristics of antioxidant capacity of some forage plants of the Baltic Sea Region (a case study of the Kaliningrad Region and Estonia)

G.N. Chupakhina, Merrit Shansky, Argaadi Parol, N.Y. Chupakhina, P.V. Feduraev, L.N. Skrypnik & P.V. Maslennikov
In this paper, we investigate changes in the antioxidant levels (anthocyanins, leucoanthocyanins, catechins) and the total water-soluble antioxidants capacity in forage plants in relation to their geography, i.e. proximity to northern or coastal areas. We demonstrate that the antioxidant content increases in unfavorable conditions, being higher in plants growing closer to the sea and in northernmost plants. Thus, since the total water-soluble antioxidants capacity is influenced by ecological factors, it may be used as one...

Morphological and biochemical indicators of Fusarium oxysporum f sp. fragariae in strawberry crops (Fragaria x ananassa Duch) in the province of Pichincha, Ecuador

S. Salazar, F. Bayas-Morejón, Z. Niño, J. Guevara, M. Ruilova, O. Merino, W. Donato & J. Guamán
Fusarium oxysporum f. sp. fragariae is a fungal pathogen, transmitted by soil in crops of strawberry (Fragaria x ananassa Duch.), which causes wilt disease that, kill the strawberry cultivars. The disease caused by Fusarium oxysporum f. sp., fragariae is hard to detect as the of the symptoms are similar with other soil-borne diseases. In spite of detection methods targeted F. oxysporum using molecular criteria have been developed, they have not been shown to successfully identity...

A comparative analysis of functional traits in semi-natural grasslands under different grazing intensities

S. Targetti, A. Messeri, G. Argenti & N. Staglianò
The reduction of traditional management practices is a major threat for the conservation of permanent grasslands in many European marginal areas. The ecological importance of grasslands is acknowledged by the European Habitats Directive 92/43/EEC (1992) which includes many natural or semi-natural grassland types, and by the growing attention of society towards functions and services provided by these ecosystems. Nonetheless, the efficiency of conservation policies is questioned also for the lack of local-scale information on trends...

Kihilise kasvatamise/kahandamise meetodid jääk- pingete määramiseks ortotroopsetes mittehomogeen- setes silindrites: rakendus kasvupingete määramiseks puu tüves

Jakub Kõo & Jaak Valgur
Kihilise kasvatamise/kahandamise meetodid jääkpingete määramiseks mittehomogeensetes ortotroopsetes silindrites pakuvad huvi jääkpingete uurimisel kihilistes komposiitmaterjalides, samuti puidu jääkpingete uurimisel ja kasvupingete modelleerimisel. Ettekandes kirjeldatakse meetodi algoritmi ja tuuakse rakendusnäitena kasvupingete modelleerimine Jaapani punase männi (Pinus densiflora) tüves. Meetodi algoritm mittehomogeensetele isotroopsetele silindritele on esitatud töös [Kõo, Valgur: 5th Int. Conf. On Residual Stresses, Linköping, 1997].

Axillary shoots derived from shoot tips in in vitro mass propagation of Anoectochilus formosanus hayata

Budi Winarto &
Axillary shoot proliferation in in vitro mass propagation of Anoectochilus formosanus was successfully established via selection of different explant types, accessions and culture media to plantlet acclimati-zation. In the initiation stage, shoot tips and Murashige and Skoog (MS) medium containing 1.5 mg l-1 N6-benzylaminopurine (BAP) and 0.25 mg l-1 α-naphthalene acetic acid (NAA) were determined as high potential explant and medium for axillary shoot regeneration of A-1 and A-2 accessions of A. formosanus compared to...

The theory of cleaning the crowns of standing beet roots with the use of elastic blades

V. Bulgakov, V. Adamchuk, M. Arak & J. Olt
A standing beet root crown cleaner has been designed. The design comprises the vertical drive shaft that carries two flat elastic cleaning blades installed on axes and connected through the articulated connection. The aim of the study was to develop the new theory of cleaning the crowns of standing roots with the use of an elastic blade installed on the vertical drive shaft in order to determine its optimal design and kinematic parameters. The first...

Lake Peipsi 2015 (Phytoplankton samples)

Marina Haldna, Ave Pent, Kadi Palmik, Kristel Panksep, Olga Tammeorg, Reet Laugaste & Jüri Konoplitski
Method: Phytoplankton samples were preserved in Lugol’s (acidified iodine) solution and counted under an inverted microscope (Utermöhl, 1958). 3 ml of preserved sample was settled overnight and counted in random fields or transects. Biovolumes of algal cells, colonies and/or filaments were calculated using assigned geometric shapes dimensions, and converted to biomass assuming the specific density of 1 g cm-3 in accordance with Edler (1979). Approved by CEN on 14 July 2006 “Water quality - Guidance...

Effect of host plants and land use on cabbage seed weevil infestation and associated parasitoids

Gabriella Kovács
The need for more sustainable pest management strategies has been increasing in light of the harmful effects that insecticides have on non-target organisms and recent regulation changes. This study aimed to provide a basis for sustainable plant protection approaches to control an important oilseed rape pest, the cabbage seed weevil (Ceutorhynchus obstrictus). Firstly, to find potential biocontrol plants that could increase the parasitism rates of C. obstrictus, the infestation rate, and parasitoid communities of this...

Effect of feed restriction on muscle fibre characteristics and meat quality traits in pigs

N. Lebedová, R. Stupka, J. Čítek, M. Okrouhlá & K. Zadinová
The aim of this study was to evaluate the effect of feed restriction on muscle fibre composition and meat quality traits in pigs. Forty crossbred pigs (Pietrain × Large WhiteSire) × (Landrace × Large WhiteDam) were divided into two feeding groups: ad libitum (AL) and restricted (R1). The effects of feed restriction on muscle fibre characteristics of the musculus longissimus lumborum et thoracis (MLLT) and meat quality traits were evaluated. Muscle fibres were stained and...

Productivity of corn hybrids in relation to the seeding rate

S. Kadyrov & M. Kharitonov
Potential yield of corn hybrids with a different FAO number is limited by not only rainfall amount, average soil and air temperature throughout vegetation period, but also directly depends on plant density. The study and practical application of special agricultural techniques allows us to limit and mitigate the negative impact of these factors on the productivity of maize, depending on the indicators under study and the soil and climatic resources of the cultivation zone. Therefore,...

Effects of selected process parameters on the compaction of carob powder

O.L. Akangbe, J. Blahovec, R. Adamovský, M. Linda & M. Hromasova
The effects of important process parameters on mechanical response during the densification of an industrial food powder were investigated and important phenomena described using the power rule. The factors studied had highly significant effects on mechanical response. The effects of the models in predicting the behaviour of the system were also highly significant. The findings are of relevance to processing and handling of food powders.

Lake Peipsi 2009 (Phytoplankton samples)

Kristel Panksep, Olga Buhvestova, Ave Pent, Kätlin Blank, Kai Ginter & Reet Laugaste
Method: Phytoplankton samples were preserved in Lugol’s (acidified iodine) solution and counted under an inverted microscope (Utermöhl, 1958). 3 ml of preserved sample was settled overnight and counted in random fields or transects. Biovolumes of algal cells, colonies and/or filaments were calculated using assigned geometric shapes dimensions, and converted to biomass assuming the specific density of 1 g cm-3 in accordance with Edler (1979). Approved by CEN on 14 July 2006 “Water quality - Guidance...

Digitalization as an essential growth factor contributing in SME development (experience of Latvia and Romania)

B. Rivza, M. Kruzmetra, I. Gudele & D. Foris
In today’s global economy, entrepreneurship is an important economic growth engine for the European Union. Small and medium-sized enterprises (SMEs) are the backbone of Europe’s economy, providing 85 % of all new jobs. The European Commission aims to promote entrepreneurship and improve the business environment for SMEs, to allow them to realise their full potential in today’s global economy (EC.2015. COSME). The expansion of SMEs in today's environment is increasingly influenced by the use of...

Enrichment of the grains from rye wort after shock-activator-disintegrating processing

A.A. Sabirov, N.V. Barakova, D. Nsengumuremyi & E.A. Samodelkin
In this study, the mode of obtaining grains (pellets) from wort prepared from rye processed by the shock-activator-disintegrator (SAD), has been developed. Additionally, the enrichment of the grains by proteins using the strain of yeast producing proteins was carried out. For cultivation of a pure culture of a strain of yeasts producing proteins, grains with a concentration of 43.00 g 100 g -1 reducing substances and 62.71 mg g -1 of the total amount of...

Lake Peipsi 2005 (Phytoplankton samples)

Reet Laugaste, Külli Kangur & Kadi Palmik
Method: Phytoplankton samples were preserved in Lugol’s (acidified iodine) solution and counted under an inverted microscope (Utermöhl, 1958). 3 ml of preserved sample was settled overnight and counted in random fields or transects. Biovolumes of algal cells, colonies and/or filaments were calculated using assigned geometric shapes dimensions, and converted to biomass assuming the specific density of 1 g cm-3 in accordance with Edler (1979). Approved by CEN on 14 July 2006 “Water quality - Guidance...

Modular sensory hardware and data processing solution for implementation of the precision beekeeping

V. Komasilovs, A. Zacepins, A. Kviesis, S. Fiedler & S. Kirchner
For successful implementation of the Precision Apiculture (Precision Beekeeping) approach, immense amount of bee colony data collection and processing using various hardware and software solutions is needed. This paper presents standalone wireless hardware system for bee colony main parameters monitoring (temperature, weight and sound). Monitoring system is based on Raspberry Pi 3 computer with connected sensors. Power supply is granted by the solar panel for reliable operation in places without constant source for power. For...

The effect of ageing on chosen quality characteristics of skeletal muscles of Aberdeen Angus bulls

Riina Soidla, Kristi Kerner, Marek Tepper, Alo Tänavots, Tanel Kaart & Ivi Jõudu
The objective of the trial was to study the qualitative parameters of two muscles of Aberdeen Angus bulls with 250–300 kg carcass weight. After slaughter, longissimus thoracis et lumborum (LD) muscle and unseparated semimembranosus and adductor femoris(SMA) muscles were removed from the chilled carcasses. Muscles were vacuum-packed and wet aged at +2 °C for 10, 14, 18 and 20 days. Meat pH, electrical conductivity, shear force and colour were measured in all ageing times. Two...

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