Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "PH" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 376
Tytuł:
A novel study of pH influence on Ag nanoparticles size with antibacterial and antifungal activity using green synthesis
Autorzy:
Wisam, J. Aziz
Haneen, A. Jassim
Powiązania:
https://bibliotekanauki.pl/articles/1177924.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
AgNPs
Green synthesis
Hydrothermal
Silver nanoparticles
Zingiber Officinale (Ginger)
pH effect
Opis:
In this paper, the effect of pH on nanoparticles (AgNPs) using plants extracting has been investigated. The aqueous sol of AgNPs prepared at different pH values using hydrothermal method display different Surface Plasmon Resonance (SPR) behavior and the maximum absorption values were at pH = 14. AgNPs were characterized using X-Ray diffraction, UV-Vis spectroscopy and scanning electron microscope. Face-center cubic Ag nanoparticles with crystal size about 3.86 nm have been noticed. The absorption band showed that Ag has sharp curves in the ultraviolet and at the edge of the visible region. The SEM images showed cluster shaped nanoparticles, and when increasing the pH values, the result revealed the formation of larger nanoparticles cluster with more accurate crystallite sizes. The antimicrobial and antifungal activity was performed by Agar well diffusion assay against Escherichia coli, Bacillus subtilis and Candida albicans. The diameter of the inhibition zones of Ag NPs against the bacterial strains such as, Bacillus subtilis (31 mm) and Escherichia coli (30 mm) at 200 µg/ml concentration and the diameter of the inhibition zones of Ag NPs against the fungus strains such as, Candida albicans (36 mm) at the same concentration.
Źródło:
World Scientific News; 2018, 97; 139-152
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A pH-responsive biopolymer-based multiple emulsion prepared in a helicoidal contactor for chemotherapeutics delivery
Emulsje wielokrotne z pH-czułym biopolimerem wytwarzane w kontaktorze helikoidalnym do dostarczania chemoterapeutyków
Autorzy:
Dluska, Ewa
Markowska-Radomska, Agnieszka
Skowronski, Patryk
Powiązania:
https://bibliotekanauki.pl/articles/2202616.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
pH-responsive biopolymer
multiple emulsions
helicoidal contactor
release process
biopolymer adsorption
pH-czuły biopolimer
emulsje wielokrotne
kontaktor helikoidalny
proces uwalniania
adsorpcja biopolimeru
Opis:
Among biopolymers, pH-responsive ones have much potential for drug delivery systems by exploiting the pH gradient between physiological and pathological states. In this paper multiple emulsions with a pH-responsive biopolymer for controlled drug delivery in brain tumor treatment were discussed. The characteristic and rheological properties of multiple emulsions, biopolymer adsorption, zeta potential, and release processes were examined. The results showed higher drug release rates in the acidic tumor microenvironment compared to the simulated conditions of normal cells.
Wśród biopolimerów, te reagujące na pH wykazują duży potencjał w systemach dostarczania leków dzięki wykorzystaniu gradientu pH między stanami fizjologicznymi i patologicznymi. W pracy omówiono emulsje wielokrotne z biopolimerem reagującym na zmiany pH, do kontrolowanego dostarczania leków w terapii guza mózgu. Zbadano charkterystykę i krzywe reologiczne emulsji, adsorpcję polimeru na kroplach, zeta potencjał i proces uwalniania. Wyniki wykazały wyższe szybkości uwalniania leku w kwaśnym mikrośrodowisku guza w porównaniu z symulowanymi warunkami normalnych komórek.
Źródło:
Polimery; 2022, 67, 7-8; 346--354
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the influence of printing orientation in metal printing using material extrusion technology on the mechanical properties of 17-4 stainless steel products
Autorzy:
Dang, Long Cao
Nguyen, Cuong Van
Le, Anh Hoang
Bui, Danh Thanh
Powiązania:
https://bibliotekanauki.pl/articles/28407327.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
additive manufacturing
material extrusion
17-4 PH stainless steel
mechanical properties
Opis:
This study investigated the influence of print orientation on the mechanical properties of 17-4 PH stainless steel parts fabricated using material extrusion technology. Tensile test specimens were 3D printed in different orientations (flat, on-edge, and upright), and their mechanical properties were evaluated. The results showed that the print orientation significantly affected the ultimate tensile strength, yield strength, and elongation at failure of the specimens. The flat and on-edge orientations exhibited similar mechanical properties, while the upright orientation resulted in lower strength and higher fracture susceptibility. Hardness measurements also indicated variations in hardness distribution among the orientations. The findings emphasize the importance of optimizing the print orientation parameter to achieve desired mechanical characteristics in 17-4 PH stainless steel parts.
Źródło:
Journal of Machine Engineering; 2023, 23, 4; 89--100
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acid-base balance parameters and a value of anion gap of arterial and venous blood in Malopolski horses
Autorzy:
Slawuta, P.
Noszczyk-Nowak, A.
Nowakowski, H.
Powiązania:
https://bibliotekanauki.pl/articles/32496.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acid-base balance
anion gap
arterial blood
venous blood
Malopolska breed
horse
pH
hydrogen carbonate concentration
carbon dioxide molecule pressure
respiratory system
animal disease
liver
Opis:
The comparative study of the acid-base balance (ABB) parameters has been performed on 20 clinically healthy mature Małopolski horses. An arterial blood sample from the facial artery and a sample of venous blood from the external cervical vein were colected from each animal. In the samples tested, the blood pH, pCO₂, tCO₂, HCO₃-, concentration of Na+, K+, Cl-, and a value of the anion gap were determined. The difference among pCO₂, tCO₂, and HCO₃ - in both samples tested was statistically significant, whereas the pH of the arterial blood and the pH of the venous blood did not differ significantly. The anion gap in both types of blood did not differ significantly. Conclusions: 1) ABB parameters such as pCO₂, HCO₃-, and tCO₂ determined in the arterial and venous blood of the Małopolski horses differ from each other significantly. 2) In spite of the lack of the differences between pH of the arterial and venous blood, the ABB parameters in horses should be determined in the arterial blood, because the comparative study performed proves that the analysis of the ABB parameters determined for the venous blood of a healthy horse may lead to a wrong diagnosis of the compensated respiratory acidosis. 3) The mean value of anion gap in horses aged 8-12 years amounts to 20.9 mmol/l for the arterial blood and 19.93 for the venous blood; the difference between the two values is not statistically significant.
Źródło:
Polish Journal of Veterinary Sciences; 2010, 13, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acidity and electrical conductivity of selected muscles in lamb carcass
Kwasowość i przewodność elektryczna wybranych mięśni tuszy jagnięcej
Autorzy:
Stanisz, M.
Pietrzak, M.
Ślósarz, P.
Steppa, R.
Powiązania:
https://bibliotekanauki.pl/articles/2197638.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
lamb
muscle
lamb meat
acidity
electrical conductivity
slaughter
carcass
correlation coefficient
pH
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio EE: Zootechnica; 2007, 25, 1; 1-6
0239-4243
2083-7399
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio EE: Zootechnica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Emission During Firing of the Illite-Based Ceramics with Fly Ash Addition
Autorzy:
Knapek, M.
Húlan, T.
Dobroň, P.
Chmelík, F.
Trník, A.
Štubňa, I.
Powiązania:
https://bibliotekanauki.pl/articles/1402156.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.ph
61.43.Fs
65.60.+a
81.70.Pg
43.40.Le
Opis:
In this work, illite-based ceramic body with power plant fly ash addition (60 wt.% of illite, 30 wt.% of fly ash and 10 wt.% of illite fired at 1100°C) was investigated by the thermal analysis techniques (differential thermal analysis, thermodilatometry and thermogravimetry) and the acoustic emission technique. The green body was heated up to 1100°C at three different rates 2.5, 5, 10 K/min. The most intense acoustic emission was recorded at the highest rate 10 K/min. Mutual correlations between thermal analyses and acoustic emission data were also examined. The first acoustic emission response appears at 430°C, corresponding to a small endotherm on the DTA curve, where the thermal decomposition of mineral portlandite takes place. In the temperature range from 600 to 900°C, high acoustic emission activity correlates with dehydroxylation and expansion of the sample. At temperatures higher than 800°C, the source of acoustic emission signals is the thermal decomposition of calcite. The amorphous phase created from illite at 920°C becomes pyroplastic, therefore it is not documented by the acoustic emission technique.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 783-786
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive control scheme based on the least squares support vector machine network
Autorzy:
Mahmoud, T. K.
Powiązania:
https://bibliotekanauki.pl/articles/930155.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
modelowanie systemu
system nieliniowy
system sterowania
sieć neuronowa
maszyna wektorów wspierających
support vector machine (SVM)
neural network
nonlinear system modeling
nonlinear system control
pH control
Opis:
Recently, a new type of neural networks called Least Squares Support Vector Machines (LS-SVMs) has been receiving increasing attention in nonlinear system identification and control due to its generalization performance. This paper develops a stable adaptive control scheme using the LS-SVM network. The developed control scheme includes two parts: the identification part that uses a modified structure of LS-SVM neural networks called the multi-resolution wavelet least squares support vector machine network (MRWLS-SVM) as a predictor model, and the controller part that is developed to track a reference trajectory. By means of the Lyapunov stability criterion, stability analysis for the tracking errors is performed. Finally, simulation studies are performed to demonstrate the capability of the developed approach in controlling a pH process.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2011, 21, 4; 685-696
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Additions of Extract Turmeric on the Presto of Lalawak Fish (Barbodes balleroides) Stored at Room Temperature
Autorzy:
Aulia, Syifa
Rostini, Iis
Junianto, Junianto
Pratama, Rusky Intan
Powiązania:
https://bibliotekanauki.pl/articles/1058044.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Barbodes balleroides
Barbonymus balleroides
Lalawak Fish
TPC (Total Plate Count)
Turmeric
Water content
pH
pindang presto
shelf life
Opis:
The purpose of this research is to determine the effectiveness of turmeric and its best concentration in preserving the presto of lalawak fish based on the characteristics of microbiological tests and chemical tests including checking water content and pH. The research experimental method covered five treatments by adding turmeric extract solutions of 0%, 1%, 3%, 5%, and 7%. The test parameters observed in the research were microbiological tests using the method of TPC (Total Plate Count) in duplicate and chemical tests including checking water content and pH. The results showed that all treatments by adding turmeric extract were with concentrations of 1%, 3%, 5%, and 7% able to extend the shelf life presto of lalawak fish more than two days compared to the presto of lalawak fish which were not treated with turmeric extract or control (0%) which can only last two days. The treatment of the addition of 5% turmeric extract is able to provide the long lasting strength of lalawak fish for up to five days so that the shelf life is longer than other treatments, as evidenced by the TPC (Total Plate Count) value of 5.81×105 CFU / gram on the 6th day. The water content reached 67.5% on the 6th day and the pH value reached 6.50 on the 5th day.
Źródło:
World Scientific News; 2019, 134, 2; 63-73
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption of Lead Ions from Aqueous Solutions onto Rice Husks, Continuous System
Autorzy:
Hawal, Laith Hamdan
Al-Sulttani, Ali Omran
Kariem, Nagam Obaid
Powiązania:
https://bibliotekanauki.pl/articles/2027895.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
adsorption
lead
rice husk
removal capacity
pH
Opis:
The continuous system of lead adsorption on rice husks was investigated in this paper. A fixed bed study was performed in many tests to investigate the influence of pH, the adsorbent height, the initial concentration of lead, the flow rate and processing time on the lead adsorption process. The results demonstrated that the lead removal capacity decreased when the pH value of the solution and the flow rate increased. The lead removal capacity increased due to the decreased initial concentration of lead. The results showed that the removal capacity increases along with the processing time and the adsorbent height in column. The largest removal was (81%) at pH of 4, the adsorbent height (50 cm), the initial concentration of lead (10 mg/l), the processing time (90 min.) and the flow rate (10 ml/min.). As a result, rice husks can be used to remove the lead instead of expensive commercial adsorbents, due to its availability, inexpensive and perfect adsorption property.
Źródło:
Journal of Ecological Engineering; 2021, 22, 10; 269-274
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Agglomeration of silicon dioxide nanoscale colloids in chemical mechanical polishing wastewater: influence of pH and coagulant concentration
Autorzy:
Noor Aina, Mahomad Zuki
Sin, Jing Yao
Jada, Amane
Dashti, Fereidonian
Fatehah, Mohd Omar
Powiązania:
https://bibliotekanauki.pl/articles/396244.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
CMP wastewater
chemical wastewater
colloids
pH
ścieki CMP
ścieki chemiczne
koloidy
Opis:
Chemical mechanical polishing (CMP) wastewater generated from semiconductor manufacturing industries is known to contain residual organic and inorganic contaminants, i.e. photoresists, acids, including silicon dioxide (SiO2), nanoparticles (NPs) and others. Nanoscale colloids in CMP wastewater have strong inclination to remain in the suspension, leading to high turbidity and chemical oxygen demand (COD). Although various types of pre-treatment have been implemented, these nanoparticles remain diffused in small clusters that pass through the treatment system. Therefore, it is crucial to select suitable pH and coagulant type in the coagulation treatment process. In this research zeta potential and dynamic light scattering measurements are applied as preliminary step aimed at determining optimum pH and coagulant dosage range based on the observation of inter particle-particle behavior in a CMP suspension. The first phase of the conducted study is to analyze nanoscale colloids in the CMP suspension in terms of zeta potential and z-average particle size as a function of pH within a range of 2 to 12. Two types of coagulants were investigated - polyaluminum chloride (PACl) and ferrous sulfate heptahydrate (FeSO4x7H2O). Similar pH analysis was conducted for the coagulants with the same pH range separately. The second phase of the study involved evaluating the interaction between nanoscale colloids and coagulants in the suspension. The dynamics of zeta potential and corresponding particle size were observed as a function of coagulant concentration. Results indicated that CMP wastewater is negatively charged, with average zeta potential of -59.8 mV and 149 d.nm at pH value of 8.7. The interaction between CMP wastewater and PACl showed that positively charged PACl rapidly adsorbed colloids in the wastewater, reducing the negative surface charge of nanoscale clusters. The interaction between CMP wastewater and FeSO4x7H2O showed that larger dosage is required to aggregate nanoscale clusters, due to its low positive value to counter negative charges of CMP wastewater.
Źródło:
Civil and Environmental Engineering Reports; 2019, 29, 3; 252-271
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ammonium chloride’s weakening effect on the copper activation of pyrite in flotation and the surface regulation mechanism behind it
Autorzy:
Zhang, Shengdong
Chen, Yumeng
Tong, Xiong
Xie, Xian
Lu, Yalin
Powiązania:
https://bibliotekanauki.pl/articles/110323.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
pyrite
depression
cuprammonium solution
pH buffering property
flotation
Opis:
The traditional separation process of pyrite and marmatite is carried out under highly alkaline conditions. Therefore, a large amount of lime is demanded and the zinc recovery cannot be guaranteed. However, under weakly alkaline conditions, copper-activated pyrite has good floatability, which is difficult to separate from marmatite. In this paper, ammonium chloride (NH4Cl) is used for depressing the flotation of copper-activated pyrite to achieve the separation of these two minerals under weakly alkaline environment. The flotation tests show that NH4Cl can significantly reduce the floatability of pyrite in weakly alkaline conditions. The results of adsorption tests and X-ray photoelectron spectroscopy (XPS) analyses indicate that NH4Cl can obviously change the composition of pyrite surface by increasing the content of iron/copper hydroxide and reducing the content of copper sulfides. Calculation of the solution composition demonstrates that the addition of NH4Cl results in the occurrence of Cu(NH3)n2+ and the pH buffering property. Based on these results, it can be concluded that the depression of NH4Cl on copper activated pyrite is mainly derived from two aspects: 1) the pH buffering property of the conjugated acid-base pair (NH4+/NH3) can impede the decline of OH- concentration, which results in more hydroxide adsorbed on pyrite; 2) NH3 (aq) competes with the pyrite surface to consume Cu2+through complexation, which causes a reduction in the amount of copper sulfides formed on the pyrite surface.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1070-1081
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Investigation on the Turbidity Removal from Natural Stone Processing Plant Wastewater by Flocculation
Badanie usuwania zmętnienia ze ścieków z zakładu przeróbki kamienia naturalnego w procesie flokulacji
Autorzy:
Ozun, Savas
Agirtmis, Dilan Ulus
Powiązania:
https://bibliotekanauki.pl/articles/318571.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
natural stone processing plant wastewater
turbidity removal
flocculant addition
flocculant concentration
pH
time
ścieki z zakładów przeróbki kamienia naturalnego
usuwanie zmętnienia
dodawanie flokulantu
stężenie flokulantu
czas
Opis:
This study aimed to determine the effects of three different high molecular weight (HMW) flocculants (anionic, cationic and non-ionic flocculants) on the fine particles removal from natural stone (foid-bearing rock) processing plant wastewater at alkaline pH conditions. The test results were investigated in terms of turbidity values depending on pH of the medium, flocculant concentration and time (0–60 min). According to the results obtained, the turbidity values of the wastewater in the absence of the flocculants were pH dependent and decreased as the pH increased, resulted in the minimum turbidity values at pH 12. In the presence of the flocculants, the pH depended turbidity removal efficiencies varied with flocculant type, flocculant concentration and time. The best results were obtained at highly alkaline pH values (pH 12) with the turbidity removal efficiency of ≤99% in the presence of non-ionic flocculant. In the case of anionic and cationic flocculants, the minimum turbidity values were also obtained at pH 12 with turbidity removal efficiencies over 90%.
Badania miały na celu określenie wpływu trzech różnych flokulantów o wysokiej masie cząsteczkowej (HMW) (flokulanty anionowe, kationowe i niejonowe) na usuwanie drobnych cząstek (pyłu kamiennego) ze ścieków z zakładów przeróbki kamienia naturalnego w alkalicznym pH. Zbadano zmętnienie w zależności od pH, stężenia flokulantu i czasu (0–6 min). Zgodnie z uzyskanymi wynikami, wartości zmętnienia ścieków przy braku flokulantów zależy od pH i zmniejszały się wraz ze wzrostem pH, co skutkowało minimalnymi wartościami zmętnienia przy pH 12. W obecności flokulantów wydajność klarowania zależy od rodzaju flokulantu, stężenia flokulantu i czasu. Najlepsze wyniki uzyskano przy wysokich alkalicznych wartościach pH (pH 12) ze skutecznością usuwania zmętnienia ≤99% w obecności flokulanta niejonowego. W przypadku anionów i flokulantów kationowych minimalne wartości zmętnienia uzyskano również przy pH 12 przy skuteczności usuwania zmętnienia powyżej 90%.
Źródło:
Inżynieria Mineralna; 2020, 2, 1; 157-162
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza poprawy efektywności działania ciepłowni geotermalnej w Pyrzycach w wyniku zastosowania modyfikacji odczynu pH zatłaczanej wody termalne
Analysis of the operating efficiency grow in the geothermal plant in Pyrzyce as a result of the injected thermal water ph modification
Autorzy:
Noga, B.
Biernat, H.
Martyka, P.
Kulik, S.
Zieliński, B.
Marianowski, J.
Nalikowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/204040.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
geotermia
otwory chłonne
kolmatacja
pH
kwasowanie
kwasowanie miękkie
geothermal
injection wells
colmatage
acidizing
soft acidizing
Opis:
W pracy przedstawiono główne problemy związane z zatłaczaniem do warstwy wodonośnej schłodzonej na wymiennikach ciepła wody termalnej. Przedstawiono również analizę metod czyszczenia otworów chłonnych. W wyniku przeprowadzonych analiz fizykochemicznych, badań laboratoryjnych i obserwacji pracy instalacji geotermalnej, opracowano nową metodę zapobiegania wytrącania się osadów ze schłodzonej wody termalnej. Zapobieganie wtórnemu wytrącaniu się osadów ze schłodzonej wody termalnej może być realizowane za pomocą modyfikacji jej odczynu pH. Metoda będąca modyfikacją miękkiego kwasowania roboczo została nazwana “metodą super miękkiego kwasowania”.
The paper presents the main problems associated with injection to the aquifer a thermal water cooled in the heat exchanger. It also presents the analysis of absorbent holes cleaning methods used in Geotermia Pyrzyce. As a result of physico-chemical analysis, laboratory tests and observation of the geothermal installation, the new method for preventing the precipitation of secondary minerals the cooled thermal water was developed. The prevention of secondary sedimentation of a cooled thermal water can be carried out with the pH stimulation. The method, which is the modification of the soft acidizing method, has been tentatively named the method of super-soft acidizing.
Źródło:
Technika Poszukiwań Geologicznych; 2013, R. 52, nr 1, 1; 59-71
0304-520X
Pojawia się w:
Technika Poszukiwań Geologicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and assessment of technological processes of the Miedwie Lake surface water treatment plant for the city of Szczecin
Analiza i ocena procesów technologicznych stacji uzdatniania wody powierzchniowej z jeziora Miedwie dla miasta Szczecina
Autorzy:
Wira, J.
Wira, D.
Powiązania:
https://bibliotekanauki.pl/articles/84845.pdf
Data publikacji:
2005
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
technological process
Lake Miedwie
surface water
water treatment plant
Szczecin city
protection zone
lake water
tributary
raw water
clean water
water parameter
water analysis
water temperature
chloride
chemical oxygen demand
oxidizability
pH reaction
alkalinity
carbon dioxide
Opis:
Miedwie Lake is the biggest post-glacial lake of the West-Pomeranian Voievodship. At the same time it is the fifth of the largest lakes in Poland. As regards the geographical situation, Miedwie Lake is situated centrally between three big agglomerations i.e. Szczecin, Stargard Szczecinski and Pyrzyce (Fig. 1). The lake lies on the territory of three municipalities: Pyrzyce and Warnice in the District of Pyrzyce as well as Stargard Szczecinski in the District of Stargard (Rozmiarek 1983, Szyper 1990). At the moment, the reservoir is characterised with the regular, prolonged shape resembling an ellipse. Banks are shallow, regular and sometime very wet. The lake has the belt of the nearshore reaching locally tens metres far from the lake bank, what is the reason, together with the fact that the wind blows always here, that it is convenient for practising the various kinds of water sports. The lake area amounts to 3 527 ha; maximal depth – 43.8 m; average depth – 19.3 m; water capacity – 681.7 mln m3; shore-line length – 38.8 km; water level datum 14.1 m above sea level; maximal width 3.16 km; maximal length 16.2 km. The lake’s bottom is the lowest situated area on the territory of Poland.
Ujecie wody „Miedwie” powstało w roku 1976. Do tego czasu wody jeziora odpowiadały pierwszej klasie czystości. Jednakże jakość wody zaczęła się pogarszać już po rozpoczęciu eksploatacji ujęcia, dochodząc aż do poziomu trzeciej klasy czystości. Przyczyną był brak oczyszczalni oraz PGR-y. Zanieczyszczenie zbiornika powodowało masowe śniecią ryb (siei miedwiańskiej), przy dnie pojawił się siarkowodór, masowo zakwitały glony. Dalsze pogarszanie się stanu jeziora groziło zamknięciem ujęcia wody oraz wyniszczeniem życia biologicznego w zbiorniku, jak również wokół niego. Spadek jakości wód jeziora spowodowany był kilkoma czynnikami: rolnictwo, baza rosyjska w Kluczewie, turystyka, dopływy jeziora, biomanipulacja wodami Miedwia.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2005, 09
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ANALYTICAL STUDY AND ANTIMICROBIAL ACTIVITY OF ALPHA-DEFENSIN 2 DISSOLVED IN PHARMACOPOEIA BUFFERS WITH DIFFERENT pH
Autorzy:
Amerikova, Meri N.
Zaharieva, Maya M.
Andonova, Lily A.
Pencheva-El Tibi, Ivanka P.
Maslarska, Vania
Najdenski, Hristo M.
Powiązania:
https://bibliotekanauki.pl/articles/895300.pdf
Data publikacji:
2020-02-29
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
pH
antimicrobial activity
analytical study
alpha-defensin 2
buffers
Opis:
Human neutrophil peptides (HNPs, alpha-defensins) are a group of six defensins being considered as new antimicrobial drugs because of their multifunctional efficiency against bacteria, viruses and fungi. Regardless of the unique biological properties alpha-defensins are unstable compounds and their activity depends on many physical and chemical factors as well as on the kind of the used cultivation media. This leads to research difficulties and obstructions in their therapeutic application. The purpose of this study was to determine antibacterial activity of alpha-defensin 2 dissolved in pharmacopeia buffers and in parallel to develop selective and accurate analytical tests for identification and assay of alpha-defensin 2 in the course of study. The antibacterial effect of alpha-defensin 2 was determined against the strain Escherichia coli (ATCC 25922). It was found that 10 mg/l of Human neutrophil peptide-2 (HNP-2, alpha-defensin 2) dissolved in pH 9.0 buffer caused 90% inhibition of the bacterial respiratory activity. This buffer was considered as a suitable environment for deploying the antibacterial activity of the alpha-defensin. А selective MS analysis method for identification of alpha-defensin 2 in sample mixtures was developed. Also HPLC method with alternative selectivity was elaborated for identification and assay of mixtures containing alpha-defensin 2 and aminoacids in Mueller Hinton broth. The procedure includes development of system suitability test determination.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2020, 77, 1; 3-10
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 376

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies