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Wyświetlanie 1-15 z 103
Tytuł:
Impact of oxygen and humidity on storage of freeze-dried Lactobacillus gasseri in relation to water activity and viability
Autorzy:
Stobińska, Magdalena
Sobecka, Katarzyna
Jarosz, Michał
Urbański, Dawid
Mizielińska, Małgorzata
Łukawska, Barbara
Olchawa, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/1178343.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
freeze-drying
probiotics
water activity
Opis:
Lactic acid bacteria have shown positive health effects and are widely distributed as dry products. They are widespread applied in functional dairy products, dietary supplements and as pharmaceutical products. Freeze-drying is a process of removing water by sublimation and is one of the most effective preservation technology. The aim of the present study was to establish impact of oxygen and humidity on freeze-dried Lactobacillus gasseri during the preparation of the powder and storage time. Lyophilisate was rubbed in aerobic and anaerobic condition with low humidity. Survival test and water activity was investigated after freeze-drying and storage in two different temperatures. The preservation of bacteria was improved when after freeze-drying process lyophilisate have not contact with oxygen and humidity. Survival rates of bacteria was the highest during storage at anaerobic condition both at 4-6 °C and 25 °C. The results shown that it is sufficient to crush of freeze-dried and packaged under anaerobic conditions to achieve higher survival of bacteria.
Źródło:
World Scientific News; 2017, 81, 2; 305-310
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Understanding of the freeze-out in ultra-relativistic heavy-ion collisions
Autorzy:
Tomašik, B.
Powiązania:
https://bibliotekanauki.pl/articles/147414.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
continuous freeze-out
escape probability
Opis:
I discuss the quantities and effects important for the freeze-out and outline a formalism for the description of continuous decoupling of particles from the fireball. Then, I present a calculation of the scattering rates of pions at various temperatures and argue that it is important to take continuous particle decoupling into account when modelling the collision dynamics.
Źródło:
Nukleonika; 2004, 49,suppl.2; 11-13
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physico-chemical and rheological properties of gelatinized/freeze-dried cereal starches
Autorzy:
Krystyjan, Magdalena
Ciesielski, Wojciech
Gumul, Dorota
Buksa, Krzysztof
Ziobro, Rafał
Sikora, Marek
Powiązania:
https://bibliotekanauki.pl/articles/972985.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
cereal starch
gelatinization
freeze-drying
process
Opis:
The influence of gelatinization and freeze-drying process on the physico-chemical and rheological properties of cereal starches was evaluated, and it was observed that modified starches revealed an increased water binding capacity and solubility when compared to dry starches, while exhibiting the same amylose and fat contents. The molecular weights of starches decreased after modification which resulted in the lower viscosity of dissolved modified samples in comparison to native starch pastes. As it was observed by scanning electron microscopy modified starches were characterized by an expanded surface, a uniform structure and high porosity.
Źródło:
International Agrophysics; 2017, 31, 3; 357-365
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement the conditioning of waste activated sludge through a sequence of freeze/thaw-electro-Fenton process
Autorzy:
Shahheidar, N.
Jorfi, S.
Takdastan, A.
Jaafarzadeh, N.
Ahmadi, M.
Powiązania:
https://bibliotekanauki.pl/articles/779096.pdf
Data publikacji:
2018
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Sludge conditioning
freeze
thaw
electro-Fenton
Opis:
Sludge conditioning is an important stage in sludge management. In the present study, a sequence of freeze/thaw-electro-Fenton process was designed and specific resistance filtration (SRF) was monitored during sludge conditioning as an important factor in sludge dewaterability. Furthermore, protein and polysaccharide concentrations were measured during the experiments. Results showed that the lowest SRF value contributed to −10°C in freezing process which showed a reducing trend by decreasing solution pH. In addition, results revealed that solution pH less than 3 caused a significant improvement in sludge dewatering; so the lowest SRF has been registered at pH = 2. By increasing current intensity from 0.5 to 1A, SRF values were reduced and then followed by an enhancement with increasing current intensity to 3.2 A. The lowest SRF value (6.1 × 104 m/kg) was obtained at H2O2 = 30 mg/L which was the best conditions for sludge dewatering.
Źródło:
Polish Journal of Chemical Technology; 2018, 20, 1; 47-53
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonance production in heavy ion collisions
Autorzy:
Markert, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/146392.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
resonance
strangeness
baryon
freeze-out
lifetime
fireball
Opis:
Resonances and their decay products may interact strongly with the hadrons in the fireball medium from the time of chemical freeze-out until the system breaks up at kinetic freeze-out. In order to try to further our understanding of the evolution and expansion of this hot and dense medium we compare resonance particle yields and spectra from elementary p+p and heavy ion collisions.
Źródło:
Nukleonika; 2004, 49,suppl.2; 119-123
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena mrozoodporności betonu na podstawie krytycznego poziomu skumulowanych uszkodzeń
Evaluation of concrete frost resistance on the basis of critical level of cumulated damages
Autorzy:
Nikitsin, V.
Backiel-Brzozowska, B.
Kosior-Kazberuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/403007.pdf
Data publikacji:
2012
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
beton
mrozoodporność
metody badań
concrete
freeze resistance
Opis:
W pracy przeprowadzono analizę danych literaturowych oraz wyników badań własnych, dotyczących zmian wybranych właściwości lub wskaźników destrukcji próbek kapilarno-porowatych materiałów budowlanych w procesie zamrażania-rozmrażania do całkowitego zniszczenia. Potwierdzono, że w procesie destrukcji betonów można wyróżnić dwa etapy o zdecydowanie różnej dynamice. Stwierdzono, że przejście procesu destrukcji materiału z pierwszego do drugiego etapu wyznacza krytyczny poziom kumulowania uszkodzeń, który może być miarąmrozoodporności materiałów. Zaproponowano sposoby wyznaczenia tego kryterium. Do oceny mrozoodporności betonu zaproponowano metodę zamrażania-rozmrażania, w której rejestruje się jedynie moment „pełnego” zniszczenia próbek betonowych.
Frost resistance of building materials is considered to be the main indicator of their durability. The analysis of degradation process of building materials subjected to cyclic freezing and thawing showed that the damages development in time runs according to two stages. The first stage is characterised by a slower damages accumulation process and a longer duration in comparison with the second stage. It was shown the time of passage the material degradation process from the first stage to the other one assigns the critical level of damages accumulation, which can be assumed for evaluation of material frost resistance. The methods to determine this criterion were proposed.
Źródło:
Budownictwo i Inżynieria Środowiska; 2012, 3, 2; 79-84
2081-3279
Pojawia się w:
Budownictwo i Inżynieria Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of whey on viability of Lactobacillus gasseri during freeze-drying process
Autorzy:
Urbański, Dawid
Jarosz, Michał
Stobińska, Magdalena
Sobecka, Katarzyna
Mizielińska, Małgorzata
Łukawska, Barbara
Olchawa, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/1179192.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
freeze-drying
lactic acid bacteria (LAB)
whey
Opis:
Probiotic bacteria have positive impacts on a numerous of physiological functions including immunomodulation and also on prevention of various intestinal diseases. However, acidic environment of the stomach and heavy conditions of freeze-drying process decrease survival of these bacteria. There are necessary researches on cheap raw materials that increase cell protection. The aim of the present study was to determine the impact of whey and other compounds on survival Lactobacillus gasseri during the freeze-drying process and storage. There were prepared culture media for cell protection during lyophilisation, which contained a variety of mixture whey, skim milk, sucrose, starch, maltodextrin and whey protein. Lyophilisate was rubbed in aerobic and anaerobic condition with lower humidity. Survival tests were investigated directly after freeze-drying process and then periodically during storage under refrigeration. Within 6 months of storage bacterial viability was similar in the samples containing liquid whey except for media containing starch. The results of viability did not deviate than those obtained with using the reference medium, which contains skim milk and sucrose. This shows that the liquid whey may be successfully used to protect the lactic acid bacteria during lyophilisation. Moreover, the use of whey can reduce the amount of waste produced in the dairy industry.
Źródło:
World Scientific News; 2017, 83; 200-205
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Azimuthally-sensitive interferometry and the source lifetime at RHIC
Autorzy:
Lisa, M.
Powiązania:
https://bibliotekanauki.pl/articles/147422.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
interferometry
HBT
heavy-ion collisions
freeze-out
Opis:
Pion interferometry (HBT) measurements relative to the reaction plane provide an estimate of the transverse source anisotropy at freeze-out, which probes the system dynamics and evolution duration. Measurements by the STAR Collaboration indicate that the source is extended increasingly out-of-plane with increasing impact parameter, suggesting a short evolution duration roughly consistent with estimates based on azimuthally-integrated HBT measurements.
Źródło:
Nukleonika; 2004, 49,suppl.2; 71-76
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Instalacja procesu suszenia niskotemperaturowego w złożu fluidalnym
Installation of low temperature drying process in a fluidized bed
Autorzy:
Krempski-Smejda, M.
Stawczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/2071179.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
suszenie niskotemperaturowe
złoże fluidalne
freeze-drying
fluidized bed
Opis:
W pracy przedstawiono budowę i schemat działania instalacji do suszenia fluidyzacyjnego niskotemperaturowego pod ciśnieniem atmosferycznym. Wykonane prace modernizacyjne komory suszarniczej umożliwiły prowadzenie procesu w złożu fluidalnym, w którym stan zamrożenia zmniejsza szybkość suszenia. Ponadto zaprezentowany został system zdalnego sterowania instalacją, której głównym atutem jest możliwość pomiaru masy bez konieczności wyjmowania próbki z komory suszarniczej.
The paper describes the principle of work and construction of freeze flu-idized-bed drying under atmospheric pressure. A modernization of drying chamber enabled one to conduct the process in a fluidized bed in which freeze state is responsible for drying rate reduction. The data acquisition and control system enabled the mass change measurement without taking out a sample from the drying chamber.
Źródło:
Inżynieria i Aparatura Chemiczna; 2010, 4; 44-45
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Cyclic Freezing and Thawing on the Hydraulic Conductivity of Selected Aggregates Used in the Construction of Green Roofs
Autorzy:
Gwóżdź, K.
Hewełke, E. A.
Sas, W.
Żakowicz, S.
Baryła, A.
Powiązania:
https://bibliotekanauki.pl/articles/124495.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
aggregates
freeze-thaw durability
hydraulic conductivity
green roofs
Opis:
The construction of a green roof requires drainage which ought to be characterized by adequate hydraulic conductivity and be resistant to changing meteorological conditions during the winter period. A properly functioning drainage system guarantees the reliability of the entire green roof system. The article presents studies on the freeze-thaw durability and hydraulic conductivity of selected aggregates applied for constructing green roof drainage systems. The aggregates were subjected to a cyclic freezing and thawing process in 30 and 70 cycles. The obtained results indicate that the conductivity of aggregates studied using the constant head method decreases along with an increase in the number of freeze-thaw cycles they were subjected to. This means that the indicator of freeze-thaw durability can have an indicative nature in the assessment of the usefulness of selected aggregates for constructing drainage layers. The conducted studies indicate that the deciding parameter when selecting an aggregate ought to be its hydraulic conductivity, determined accounting for the changes taking place in the freeze-thaw cycles. The equations of changes in the conductivity of aggregates indicated by the authors make it possible to assess them for practical purposes.
Źródło:
Journal of Ecological Engineering; 2016, 17, 4; 50-56
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the pre-wetting of expanded clay aggregate on the freeze-thaw resistance of the expanded clay aggregate concrete
Autorzy:
Musiał, Michał Piotr
Grzymski, Filip
Trapko, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1845171.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
lightweight concrete
freeze-thaw resistance
aggregate pre-wetting
Opis:
This paper presents experimental research on expanded clay aggregate concrete. The aim of the investigations was to determine if the pre-wetting of expanded clay aggregate has an effect on the freeze-thaw durability of the expanded clay aggregate concrete. Five concrete series based on the same concrete mix design were made and tested. The degree of pre-wetting of the aggregate was varied: dry aggregate was used in the first series, aggregate with a moisture content of 10% was used in series IA and IB and aggregate with a moisture content of 25% was used in series IIA and IIB. Also the approach to the production process was varied: in series A the water contained in the aggregate was taken into account in the global water-cement ratio (consequently a reduced amount of water was added to the mix), whereas in series B the nominal amount of water was added to the mix (as in the case of dry aggregate). The freeze-thaw resistance criterion was based on the assessment of the decrease of compressive strength and increase in weight loss after exposure to freeze-thaw cycles. The expanded clay aggregate concrete’s strength and mass decrements caused by freeze-thaw cycling were used as the measure of its freeze-thaw resistance. The investigations have shown that the pre-wetting of expanded clay aggregate has an effect on the freeze-thaw durability of the expanded clay aggregate concrete. The differences of concrete compressive strength decrease related to freezethaw durability may be 2 to 5 times greater when inadequate method of calculating mixing water for concrete is used.
Źródło:
Studia Geotechnica et Mechanica; 2021, 43, 2; 65-73
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Konserwacja mokrego drewna metodą "freeze-drying" w Centralnym Muzeum Morskim w Gdańsku
CONSERVATION OF WET WOOD BY MEANS OF FREEZE-DRYING IN THE CENTRAL MARINE MUSEUM IN GDANSK
Autorzy:
Dyrkowa, Maria
Jagielska, Irena
Powiązania:
https://bibliotekanauki.pl/articles/535235.pdf
Data publikacji:
1981
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
konserwacja mokrego drewna metodą „freeze-drying”
Centralne Muzeum Morskie w Gdańsku
usuwanie wody z drewna
próżniowe osuszanie drewna „freeze-drying”
Opis:
The article describes conservation of wet wood by means of a freeze- drying method. The technique consists in the sublimation of ice in vacuum, i.e. conversion of ice into gas with the omission of conversion into water. Practically it means that objects are placed in 5—15 per cent water solution of PEG-400 for the period from two weeks to several months, depending on their condition and thickness. Then they are subjected to freezing at temp. —26°C at least for 48 hours. After freezing, wooden objects are transferred to a Danish made freeze-dryer where sublimation, occurs until a complete removal of ice from the objects. This method was used in the Central Marine Museum in Gdańsk to preserve a few hundred wooden objects from the wrecks of the Solen and W-21 and the results obtained were very satisfactory.
Źródło:
Ochrona Zabytków; 1981, 3-4; 203-205
0029-8247
Pojawia się w:
Ochrona Zabytków
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Freeze-proof durability of concrete incorporating recycled coarse aggregate
Autorzy:
Deng, Xianghui
Xue, Liyuan
Wang, Rui
Gao, Xiaoyue
Powiązania:
https://bibliotekanauki.pl/articles/231420.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
kruszywo recyklingowe
kruszywo gruboziarniste
beton
cykl zamrażanie-odmrażanie
mrozoodporność
recycled aggregate
coarse aggregate
concrete
freeze-thaw cycle
freeze-proof durability
Opis:
The recycle of the building and demolition waste could reduce project expenses and save natural resources as well as solve problem about environmental risks incurred during the disposal of building waste. In this study, waste C30 concrete is taken an experimental material. The mass loss, ultrasonic velocity, dynamic modulus of elasticity and cubic compressive strength of recycled coarse aggregate concrete whose coarse aggregate replacement percentage is 25%, 50%, 75%, and 100% are tested and compared with NAC when the cycles of freezing and thawing are 0, 25, 50, 75, 100, 125, 150, 175, and 200 times. The results show: (1) Generally, the loss of mass, ultrasonic velocity, dynamic modulus of elasticity and cubic compressive strength constantly increase with the growth of freezing and thawing cycles. (2) Compared with the recycled concrete of other replacement percentages, the RAC50 shows relatively close performance to NAC in mass loss, the change of dynamic modulus of elasticity and cubic compressive strength. (3) Performances of RAC25 specimens are better than the other RAC specimens for the ultrasonic wave velocity.
Źródło:
Archives of Civil Engineering; 2019, 65, 4; 63-80
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Konserwacja i rekonstrukcja rękawicy skórzanej z Wyspy Spichrzów w Gdańsku
Conservation and reconstruction of a leather glove from Wyspa Spichrzów in Gdańsk
Autorzy:
Nowak, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/681893.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Gdańsk
rękawica skórzana
konserwacja
freeze-drying
leather glove
conservation
Opis:
The article presents brief characteristics of protective gloves, based on an example of an artifact excavated during archaeological exploration of a „Babel” granary at Żytnia street in Gdańsk. The object was treated and reconstructed in The Documentation and Conservation Laboratory of The Institute of Archaeology, NCU in Toruń. The article includes conservation issues, the program and description of treatments implemented working on the object, as well as the problem of importance of archaeological objects’ reconstruction to demonstrate technological processes and crafts of creating the items, especially to the public not being involved in scientific problems and having difficulties in perception of destroyed artifacts, deprived of their cultural contexts.
-
Źródło:
Acta Universitatis Lodziensis. Folia Archaeologica; 2018, 33; 177-188
0208-6034
2449-8300
Pojawia się w:
Acta Universitatis Lodziensis. Folia Archaeologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Evidence for Non-encysted, Freeze-resistant Stages of Terrestrial Naked Amoebae Capable of Resumed Growth after Freeze-thaw Events
Autorzy:
Anderson, O. Roger
Powiązania:
https://bibliotekanauki.pl/articles/763509.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Cold adaptations, cryoprotective dormancy, resting cells, winter freeze resistance
Opis:
Experimental evidence is presented to support a hypothesis that terrestrial naked amoebae, collected during late autumn from cold, moist temperate soil, develop a non-encysted, freeze-thaw resistant stage that is capable of surviving winter frozen soil. Therefore, in addition to cyst formation, naked amoebae may survive harsh, frozen winter soil in a dormant or resting stage that is capable of rapid resumed growth in spring, thus gaining an immediate competitive advantage in exploiting food and other environmental resources early after the winter thaw.
Źródło:
Acta Protozoologica; 2016, 55, 1
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
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