Wyniki wyszukiwania - BazTech

1

Wpływ długości granulki na wybrane charakterystyki procesu wytłaczania

Sikora J. W., Samujło B.

Przetwórstwo Tworzyw

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2012

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[R.] 18, nr 5

511-517

PL

W artykule przedstawiono wyniki badań wpływu długości granulki poli(chlorku winylu) plastyfikowanego na przebieg procesu wytłaczania. Ustalono, że długość granulki nie wpływa istotnie na temperaturę ścianki cylindra, korpusu głowicy wytłaczarskiej oraz wytłoczyny, natomiast wpływa znacząco na moment obrotowy ślimaka wytłaczarki, który ulega zwiększeniu wraz ze zwiększaniem długości granulki.

EN

The paper presents the influence of the length of plasticized poly(vinyl chloride) pellet on the course of extrusion process. It was found that the length of the pellets does not significantly affect the temperature of the barrel wall, extruder head and the extrudate, while significantly affected screw torque, which is increased with increasing length of the pellets.

2

Distribution of extracellular polymeric substances and their role in aerobic granule formation

Miksch K., Kończak B.

Chemical and Process Engineering

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2012

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Vol. 33, nr 4

679--688

EN

This study investigated the quantity and distribution of extracellular polymeric substances (EPS) in aerobic granules. Results showed that EPS play an important role in the formation and stabilisation of granules. The content of EPS significantly increases during the first weeks of biogranulation. An analysis of EPS in the granules revealed that the protein level was 5 times higher than in polysaccharides. The increase of protein content correlated with the growth of cell hydrophobicity (r2 = 0.95). EPS and hydrophobicity are important factors in cell adhesion and formation of granules. The aim of this work was also to determine the distribution of EPS in the granule structure. In situ EPS staining showed that EPS are located mostly in the center of granules and in the subsurface layer. The major components of the EPE matrix are proteins, nucleic acids and [beta]-polysaccharides. These observations confirm the chemical extraction data and indicate that granule formation and stability are dependent on protein content.

3

Formy chitozanowe do zastosowań w inżynierii biomedycznej

Modrzejewska Z.

Inżynieria i Aparatura Chemiczna

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2011

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Nr 5

74-75

PL

W pracy przedstawiono podstawowe kierunki badań własnych nad wykorzystaniem różnych form chitozanu (hydrożelowych membran, granulek, hydrożeli formujących się w fizjologicznej temperaturze ciała ludzkiego) w inżynierii biomedycznej. Główne możliwości zastosowania tych form to opatrunki, nośniki leków oraz scaffoldy do hodowli komórkowej.

EN

The paper presents the use of different forms of chitosan (hydrogel membranes, granules, hydrogels forming in physiological temperature of a human body) in biomedical engineering. The main applicability of these forms arc wound dressings, drug carriers and scaffolds for cell culture.

4

Seed dispersal by the Rook (Corvus frugilegus L.) in agricultural landscape - mechanisms and ecological importance

Czarnecka J., Kitowski I.

Polish Journal of Ecology

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2010

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Vol. 58, nr 3

511-523

EN

The study aimed to evaluate the role of the Rook Corvus frugilegus in the long-distance seed dispersal in agricultural landscape. According to the literature, Rooks feed in the distance 0.3-1 km from the breeding colonies and 10-40 km from winter communal roosts, and these can be also the potential seed dispersal distances. We concentrated on the dispersal of diaspores of ornitochorous species and weeds (called non-ornitochorous) taken probably incidentally during foraging for other edible plant material. The contents of 528 pellets was analysed, 304 were collected at six sites of breeding colonies located in five rural parks and in one park on the city outskirts, and 224 under three winter roosts in the cities. Seeds representing 45 taxa were found, the most important groups among them are: ornitochorous species (10 taxa), non-ornitochorous (27 taxa, mainly weeds and ruderal species) and cereals (4 species). The mean number of seeds varied between 221 and 442 seeds per 100 pellets in the case of breeding colonies, and between 102 and 347 for wintering roosts. Fruits of ornitochorous species are an important element of the diet of the Rook: Cerasus avium and Fragaria sp. during breeding season and Vitis sp., Sorbus aucuparia and Sambucus nigra during winter. Nonornitochorous species are present in pellets in lower numbers and frequencies than ornitochorous ones and they can be divided into two groups: those transported during breeding season (mainly Stellaria media) and those during winter (Setaria sp. and Echinochloa crus-galli). We estimated that the number of non-ornitochorous seeds transported by birds from the biggest observed winter roosts can exceed 400 thousands seeds per month. The value is much lower in the case of the biggest breeding colony: approximately 16 thousands of propagules. We also checked if species found in pellets can germinate in natural conditions under the studied colonies. Viable individuals of 15 nonornitochorous and of one ornitochorous species were found there, and it was observed that disturbances of soil surface promote germination of some analysed species. @eng

5

Czyszczenie elementów maszyn i urządzeń granulkami suchego lodu.

Tubielewicz K., Tubielewicz M., Turczyński K.

Inżynieria Materiałowa

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2002

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R. XXIII, nr 5

662-668

PL

Przedstawiono zasady czyszczenia powierzchni granulkami suchego lodu (CO2), pokazano opracowane do tego celu urządzenia i agregaty stosowane w warunkach przemysłowych. Podano wady i zalety oraz praktyczne możliwości zastosowania tej ekologicznej technologii do czyszczenia różnego rodzjau powierzchni metalowych i niemetalowych.

EN

The principles of surface cleaning by using dry ice (CO2) granules have been presented, devices and units developed for this purpose destined for used in industrial conditions have been shown. The advantages and disadvantages, as well as the practical possibilities of using this ecological technology for cleaning of different types of metallic and nonmetallic surfaces have been given.