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    Wyświetlanie 1-7 z 7
    Tytuł:
    Wheat anther culture as affected by various cultural changes and supplements
    Autorzy:
    Simonson, R L
    Baenziger, P S
    Gustafson, V D
    Powiązania:
    https://bibliotekanauki.pl/articles/2046627.pdf
    Data publikacji:
    1997
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cultural change
    supplement
    wheat
    silver nitrate
    Triticum aestivum
    anther culture
    cereal tissue
    Opis:
    With the numerous improvements in cereal tissue and wheat anther culture, it is necessary to determine which of the improvements should be combined for optimal response. This study was conducted using one highly responsive cultivar of wheat (Triticum aestivum L. cv. Pavon 76) to test the effectiveness of pre-culture cold treatment (0 or 3-7 days at 5°C) of anthers, five initiation basal media, and various changes in Murashige-Skoog regeneration media. A cold pre-culture treatment was inhibitory for all initiation media for embryoid initiation. Of the initiation media, P1, 85D12, and N6 were similar for embryoid initiation (0.80 to 0.90 embryoids/anther) without a cold pre-culture treatment. Plant regeneration was improved by the addition of amino acids or glucose, increased sucrose concentration, filter sterilizing the medium, and altering plant growth regulator concentrations. P1 medium which is normally used for embryoid initiation was also beneficial for improving plant regeneration. Ethylene inhibitors were generally not beneficial.
    Źródło:
    Journal of Applied Genetics; 1997, 38, 4; 381-392
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the properties of HAp micropowders after ion exchange process in silver nitrate solution
    Autorzy:
    Głuszek, Marta
    Świrska, Zuzanna
    Kaczorowski, Witold
    Januszewicz, Bartłomiej
    Wrotniak, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/2058388.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    hydroxyapatite
    ion exchange
    silver nitrate (V)
    annealing
    XRD
    Raman spectroscopy
    hydroksyapatyt
    wymiana jonowa
    spektroskopia
    Opis:
    Bioceramic materials, such as hydroxyapatite (HAp), are characterized by high biocompatibility in the presence of tissues and body fluids without causing toxic or allergic reactions. Hydroxyapatite, due to its similarity to structures found in bones, is used both in the form of powders, e.g. as additives to bone cements, and implants coatings. However, this material is not characterized by antimicrobial properties, therefore attempts are made to improve its properties by introducing additional elements into the hydroxyapatite structure. Thanks to HAp’s high ion-exchange ability, silver can be introduced into its structure. The calcium ions present in the HAp structure can be easily replaced by silver ions to create a material endowed with high biocompatibility and antibacterial properties. The presented study is based on the analysis of the morphology of the modified powders via scanning electron microscopy (SEM), their chemical composition via X-ray energy dispersive spectroscopy (EDS) and chemical structure via X-ray diffraction (XRD) and Raman spectroscopy. The powders obtained through the ion exchange were mixtures of silver phosphates Ag3PO4 and HAp. The highest silver content was found in the sample modified with a 1M concentration of AgNO3 in the aqueous solution. It was also determined that the annealing of the obtained powders under vacuum at 800°C resulted in the formation of metallic silver and a change in the structure of HAp to β-TCP.
    Źródło:
    Engineering of Biomaterials; 2021, 24, 161; 15--20
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Possibility to Use Sodium Water Glasses Produced in Poland to Remove Ag+ Ions from Aqueous Media
    Ocena możliwości wykorzystania krajowych szkieł wodnych sodowych do usuwania jonów Ag+ z mediów wodnych
    Autorzy:
    Koźlak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/387887.pdf
    Data publikacji:
    2012
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    sodium water glasses
    silver nitrate
    toxicity
    turbidimetry
    tensiometry
    colloidal silver silicates
    szkła wodne sodowe
    azotan srebra
    toksyczność
    turbidymetria
    tensometria
    koloidalne krzemiany srebra
    Opis:
    Systems containing sodium water glass produced at Zakłady Chemiczne in Rudniki and silver nitrate were examined by turbimetric method based on obtaining dissolved silver silicate. From turbidimetry waveform we obtained results indicating that silver silicate is formed immediately in initial phase of measuerment and has no further increase of turbidity in time. The values of turbidity and surface tension of studied system depend on the value of Mk. Low-module silicates can be treated as more useful in removing Ag+ ions from water media.
    Metodą turbidymetryczną polegającą na otrzymywaniu rozpuszczonego krzemianu srebra badano układy zawierające krajowe szkła wodne sodowe produkcji Zakładów Chemicznych w Rudnikach oraz azotan srebra. Z przebiegu krzywych zmętnienia wynika, że krzemiany srebra powstają natychmiast w początkowej fazie pomiaru i nie ma dalszego przyrostu zmętnienia w czasie. Wartość zmętnień i napięcia powierzchniowego badanych układów zależą od wartości Mk. Krzemiany niskomodulowe mozna uznac jako bardziej przydatne w usuwaniu jonów Ag+ z mediów wodnych.
    Źródło:
    Ecological Chemistry and Engineering. A; 2012, 19, 10; 1289-1295
    1898-6188
    2084-4530
    Pojawia się w:
    Ecological Chemistry and Engineering. A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of lead nitrate on cyanide leaching of gold and silver from turkish gold ores
    Autorzy:
    Sayiner, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/109335.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    lead nitrate
    gold
    silver
    cyanide leaching
    Opis:
    Effect of lead nitrate addition on cyanidation of Havran, Ovacık, Mastra LCu (low copper) and Mastra HCu (high copper) gold ores was investigated by laboratory tests at the Ovacik Gold Mine Metallurgy Laboratory. Leach tests were performed at optimum NaCN additions and pH values while different lead nitrate additions were applied. Ovacik cyanidation plant leaching time, 24 hours for the constant 100 Mg/h ore feed rate was applied as optimal for all lead nitrate tests. Results showed the increase in gold and silver recoveries between 0.4-1.2% for gold and 3.9-11.6% for silver at the end of 24 hours leaching by the addition of lead nitrate as 0.1-0.5 kg/Mg. NaCN consumption decreased or did not change except for the Ovacik ore. In the case of the Ovacik ore it slightly increased.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 2; 507-514
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of pre-aeration on cyanide leaching of a non-refractory sulphide gold and silver ore
    Autorzy:
    Aydin, B.
    Basturkcu, H.
    Gul, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/951867.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nonrefractory sulphide gold–silver
    cyanidation
    lead nitrate
    hydrogen peroxide
    aeration
    Opis:
    The leaching behaviour of a sulphide gold-silver ore was investigated in terms of a relationship between gold and silver extractions and cyanide consumption. Ninity five Au % and 88.0% Ag extractions were obtained under the determined conditions of 24 h leaching duration, -74 μm particle size, 40% solids ratio, 4 g/dm3 NaCN concentration, and 450 rpm stirring speed with NaCN consumption of 3.35 g/dm3. Since the NaCN consumption was higher than in industrial applications, Pb(NO3)2 and H2O2 additions and aeration using an air pump were tested during leaching in order to decrease the consumption. While Pb(NO3)2 addition with aeration caused a decrease in the metal extractions, the individual or combined additions of H2O2 and aeration could not provide a reduction in the cyanide consumption. Therefore, the effect of the pre-aeration followed by cyanidation was tested. Eventually, applying 4 h of pre-aeration before a shorter leaching duration of 12 h provided 92.0% Au and 90.5% Ag extractions with a reduced NaCN consumption of 2.44 g/dm3.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 647-660
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrodeposition of silver from nitrate-tartrate solutions
    Katodowe osadzanie srebra z roztworów azotanowo-winianowych
    Autorzy:
    Rudnik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/264055.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    electrolysis
    morphology
    nitrate
    silver
    tartrates
    elektroliza
    morfologia
    azotan
    srebro
    winiany
    Opis:
    The electrodeposition of silver from AgNO3 solutions with the addition of L-tartaric acid was investigated. The cathodic reaction was accompanied by low electrode polarization and run under activation control for AgNO3 concentrations of above 70 mM. Tartaric acid only slightly shifted the polarization curves towards more electronegative potentials (by approx. 50 mV), but it did not change the rate-determining step. The activation control of the process resulted in the formation of rough and coherent deposits, while the mixed or diffusion control of the process promoted the formation of dendritic-like structures and spongy deposits.
    Przeprowadzono badania katodowego osadzania srebra z roztworów AgNO3 zawierających L-kwas winowy. Reakcji katodowej towarzyszy mała polaryzacja elektrody, a redukcja biegnie w zakresie kontroli aktywacyjnej dla stężeń AgNO3 powyżej 70 mM. Dodatek kwasu winowego w niewielkim stopniu przesuwa krzywe polaryzacyjne w kierunku bardziej ujemnych potencjałów (o ok. 50 mV), nie zmieniając jednak etapu powolnego reakcji katodowej. W zakresie kontroli aktywacyjnej tworzą się szorstkie i zwarte warstwy srebra, natomiast zakres kontroli mieszanej lub stężeniowej sprzyja tworzeniu się struktur dendrytopodobnych lub gąbczastych.
    Źródło:
    Metallurgy and Foundry Engineering; 2018, 44, 2; 81-89
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of production of silver nanoparticles using soil fungi and its applications for reducing irrigation water salinity
    Autorzy:
    Yaseen, Rabaa
    Kotp, Yousra H.
    Eissa, Doaa
    Powiązania:
    https://bibliotekanauki.pl/articles/292300.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    antimicrobial activity
    dehydrogenase
    mycoynthesized nano-silver
    nitrate reductase
    reverse osmosis
    soil salinity
    water desalination
    Opis:
    In the present work, the dried biomass of soil isolated fungus Eurotium cristatum was used for synthesizing silver nanoparticles (AgNPs). The synthesized AgNPs were spherical in shape with average diameter of 16.56 nm and displayed maximum absorbance at 418. Fourier transform infrared (FTIR) study indicated the presence and binding of proteins with myco-produced silver nanoparticles. The optimum conditions for AgNPs biosynthesis were found to be at temperature of 40°C, pH of 8.0, substrate concentration of 500 ppm and fungal biomass wt. of 0.8 g. The AgNPs showed antibacterial activity against Staphylococcus aureus, Listeria monocytogenes, Escherichia coli and Shigella flexneri. AgNPs was built-in thin film nanocomposite (TFNC) membrane and the impacts of nanomaterial composition on membrane properties and desalination process were studied. The AgNPs produced membrane TFNC had better filtration performances than pure thin film composite membrane TFC. The TFNC membrane had enhanced water flux (32.0 vs. 16.5 dm3∙m–2∙h–1) and advanced NaCl rejection (91.7 vs. 89%) compared to the TFC membrane. A pot experiment was conducted to evaluate the effect of the irrigation with desalinated water on yield and productivity of essential oil of the sweet basil (Ocimum basilicum L.) and lavender (Lavandula multifida L.). The irrigation with desalinated water reduced significantly the soil reaction, soil electrical conductivity (EC), sodium adsorption ratio and exchangeable sodium percent in rhizospheric soil, it also enhanced the growth and oil yield of both plants compared with those irrigated with salt water.
    Źródło:
    Journal of Water and Land Development; 2020, 46; 216-228
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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