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    Wyświetlanie 1-11 z 11
    Tytuł:
    Purification and characterization of a heteromultimeric glycoprotein from Artocarpus heterophyllus latex with an inhibitory effect on human blood coagulation
    Autorzy:
    Siritapetawee, Jaruwan
    Thammasirirak, Sompong
    Powiązania:
    https://bibliotekanauki.pl/articles/1039843.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    blood coagulation
    jackfruit
    latex
    moraceae
    Artocarpus heterophyllus
    Opis:
    Plant latex has many health benefits and has been used in folk medicine. In this study, the biological effect of Artocarpus heterophyllus (jackfruit) latex on human blood coagulation was investigated. By a combination of heat precipitation and ion-exchange chromatography, a heat stable heteromultimeric glycoprotein (HSGPL1) was purified from jackfruit milky latex. The apparent molecular masses of the monomeric proteins on SDS/PAGE were 33, 31 and 29 kDa. The isoelectric points (pIs) of the monomers were 6.63, 6.63 and 6.93, respectively. Glycosylation and deglycosylation tests confirmed that each subunit of HSGPL1 formed the native multimer by sugar-based interaction. Moreover, the multimer of HSGPL1 also resisted 2-mercaptoethanol action. Peptide mass fingerprint analysis indicated that HSGPL1 was a complex protein related to Hsps/chaperones. HSGPL1 has an effect on intrinsic pathways of the human blood coagulation system by significantly prolonging the activated partial thrombin time (APTT). In contrast, it has no effect on the human extrinsic blood coagulation system using the prothrombin time (PT) test. The prolonged APTT resulted from the serine protease inhibitor property of HSGPL1, since it reduced activity of human blood coagulation factors XIa and α-XIIa.
    Źródło:
    Acta Biochimica Polonica; 2011, 58, 4; 521-528
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Latex sensitization and risk factors in female nurses in Thai governmental hospitals
    Autorzy:
    Supapvanich, Chompunuch
    Povey, Andrew
    Vocht, Frank
    Powiązania:
    https://bibliotekanauki.pl/articles/2178797.pdf
    Data publikacji:
    2014-03-22
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    sensitization
    nursing
    Latex allergy
    developing world
    occupational asthma
    occupational dermatitis
    Opis:
    Objectives: Exposure to latex allergens in latex gloves can cause occupational health problems in nurses, yet latex gloves are still widely used in Thai hospitals. Therefore, we conducted a study to determine the prevalence of latex sensitization in nurses and identify risk factors associated with sensitization. Methods: A questionnaire, providing information on personal characteristics, ill-health, working conditions and symptoms related to latex product use, was administered to 363 female nurses working in two tertiary hospitals in southern Thailand. Latex sensitization was confirmed using a solid phase immunoassay to detect anti-latex IgE antibodies. Total glove protein levels were determined by using a modified Lowry method and latex aeroallergens by a competitive inhibition immunoassay. Results: The overall prevalence of latex sensitization was 4.4%. Respiratory symptoms related to latex glove use were significantly associated with latex sensitization (OR = 5.5, 95% CI: 1.57-19). Total glove protein levels ranged 87.8-250.8 μg protein/dm². The prevalence of latex sensiti- zation was higher (6.6% vs. 2.2%) in the hospital where gloves with higher protein levels (82-438 μg/g vs. 86-170 μg/g) were used. Furthermore, latex sensitization prevalence increased from 3% to 5% with increased average departmental aeroallergen concentrations. Conclusions: Latex sensitization prevalence in Thai nurses was higher than previously reported. Respiratory exposure seems to play an important role, in addition to dermal exposure. If latex gloves cannot be replaced by non-latex alternatives, replacement with gloves with lower protein content should be considered.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2014, 27, 1; 93-103
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on properties of bitumen modified with polymers used for asphalt concrete pavement on bridges
    Issledovanie svojjstv bitumov modificirovanykh polimerom dlja ispol'zovanija asfal'tobetonnykh pokrytijj na mostakh
    Autorzy:
    Onischenko, A.
    Kuzminets, M.
    Aksenov, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/793681.pdf
    Data publikacji:
    2014
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    bituminous surface
    polymer
    elasticity
    latex polymer
    asphalt concrete
    bridge
    binding agent
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 4
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Treatment of effluent (skim latex serum) from a rubber processing plant with Fenton’s reagent
    Autorzy:
    Lim, Y. P.
    El-Harbawi, M.
    Yin, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/208203.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ChZT
    lateks
    odczynnik Fentona
    oczyszczanie ścieków
    COD
    Fenton's reagents
    latex
    sewage treatment
    Opis:
    The treatment effectiveness of Fenton's reagent using Fe2+catalyst to reduce chemical oxygen demand (COD) of skim latex serum and the effect of varying concentrations of H2O2, Fe2+and initial solution pH on its treatment efficiency were investigated. The highest COD removal efficiency obtained was approximately 80% at optimum conditions. The treatment required either nominal or no acidification as initial pH of serum is very close to the optimum pH = 4. COD removal increased upon increasing H2O2 and Fe2+concentrations. This study shows the suitability of using Fenton's process with H2O2and FeCh as a pre-Treatment for skim latex serum. The findings reported here represent a potentially simpler and more cost-effective alternative treatment to other treatment methods since only reagents and not capital-intensive materials (such as membrane) are required.
    Źródło:
    Environment Protection Engineering; 2017, 43, 3; 247-254
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular profile of sensitization in subjects with short occupational exposure to latex
    Autorzy:
    Lamberti, Monica
    Buonanno, Rosaria
    Ritonnaro, Chiara
    Giovane, Giancarlo
    Crispino, Vincenzo
    Feola, Antonia
    Medici, Nicola
    Sannolo, Nicola
    Di Carlo, Angelina
    Di Domenico, Marina
    Powiązania:
    https://bibliotekanauki.pl/articles/2177165.pdf
    Data publikacji:
    2015-07-17
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    occupational exposure
    ImmunoCAP
    natural rubber latex
    skin prick test
    contact dermatitis
    gloves
    Opis:
    Objectives We examined the prevalence of latex allergy in subjects with occupational exposure to latex allergens for less than 5 years, determining the disease spectrum in symptomatic workers. We identified the most frequent molecular allergens by Immuno- CAP (ICAP), correlating the findings with skin prick test (SPT) results. Material and Methods Seven hundred twenty-three healthcare students using latex gloves on a regular basis were invited to participate in a baseline questionnaire screening. An ICAP serum test was performed only when a possible latex allergy was indicated by the questionnaire. Results The total number of participants responding to the baseline survey was 619. Glove-related symptoms were indicated by 4% (N = 25) of the students. The most common symptom was contact dermatitis (N = 18, 72%). In 12 subjects, ICAP revealed a real sensitization to latex, with a recombinant latex allergen profile showing a high frequency for rHev b 6.01 specific immunoglobulin E (sIgE) (N = 9, 67%). In these individuals, skin symptoms were more prevalent than other types (88%). Conclusions The combined positivity for rHev b 6.01, rHev 8 and rHev b 5 determined by ICAP identified 92% of latex-allergic subjects with short-term exposure to latex.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2015, 28, 5; 841-848
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Consideration of the safety of bungee jumping in relation to mechanical properties of the installation based on a jump accident in Gdynia
    Autorzy:
    Tomaszewska, Agnieszka
    Kłosowski, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/38890056.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    bungee rope failure
    bungee jumping safety
    latex rope
    mechanical test
    safety factor
    Opis:
    This paper considers a bungee jumping accident that took place in July 2019 in Gdynia, Poland. The authors conducted an investigation to determine the cause of the bungee rope failure. It was based on mechanical tests concerning the strength of the rope as well as the calculation of the force induced in the rope during the jump. Based on the theoretical and experimental results, the rope safety factor was estimated. It appeared to be three-fold lower than it is recommended in Polish regulations concerning ropes dedicated to lifting people for industrial and public purposes. However, no law regulations strictly concerning bungee installation makes it easy for accidents to occur.
    Źródło:
    Engineering Transactions; 2022, 70, 4; 407-424
    0867-888X
    Pojawia się w:
    Engineering Transactions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Controlled functionalization of sp2 carbon allotropes for the reinforcement of diene elastomers
    Autorzy:
    Barbera, V.
    Bernardi, A.
    Torrisi, G.
    Porta, A.
    Galimberti, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/273025.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
    Tematy:
    sp2 carbon allotrope
    functionalization
    NR latex
    alotrop węgla sp2
    funkcjonalizowanie
    lateks NR
    Opis:
    This paper reports functionalization reactions of sp2

     carbon allotropes, both nano- and nanostructured, able to introduce heteroatoms such as oxygen and nitrogen, without altering the bulk crystalline organization of the graphitic substrates. sp2

     carbon allotropes were: carbon black (CB), nanosized graphite with high surface area (HSAG), multiwalled carbon nanotubes (CNT). Reactions of carbon allotropes were performed with either KOH or hydrogen peroxide or a serinol derivative, 2-(2,5-dimethyl-1H-pyrrol-1-yl)-1,3-propanediol (serinolpyrrole, SP), in the absence of solvents or catalysts, by simply donating either thermal or mechanical energy. Sulphur cured composites with HSAG containing hydroxy groups (from the reaction with KOH) revealed better mechanical properties than composites from melt blending with pristine HSAG. CB functionalized with SP was able to promote reduction of Payne effect in compounds based on CB and silica.
    W artykule przedstawiono reakcje funkcjonalizacji alotropów węgla sp sp2

     , zarówno nano-, jak i nanostrukturalnych, zdolnych do wprowadzania heteroatomów, takich jak tlen i azot, bez zmiany struktury krystalicznej materiałów grafitowych. Alotropami węgla sp2

      były: sadza (CB), grafit nanokrystaliczny o dużej powierzchni (HSAG), wielowarstwowe nanorurki węglowe (CNT). Reakcje alotropów węgla przeprowadzono za pomocą KOH lub nadtlenku wodoru lub pochodnej serinolu, 2-(2,5-dimetylo-1H-pirol-1-ylo)-1,3-propanodiolu (serinolopirolu, SP), w nieobecności rozpuszczalników lub katalizatorów, po prostu dostarczając energii cieplnej lub mechanicznej. Kompozyty utwardzane siarką z grupami hydroksylowymi HSAG (z reakcji z KOH) wykazały lepsze właściwości mechaniczne niż kompozyty uzyskane w wyniku mieszania w stanie stopionym z czystym HSAG. CB funkcjonalizowana za pomocą SP była w stanie zapewnić redukcję efektu Payne’a w mieszankach opartych na CB i krzemionce.
    Źródło:
    Elastomery; 2017, 21, 4; 235-251
    1427-3519
    Pojawia się w:
    Elastomery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Controlled-release urea encapsulated by ethyl cellulose/butyl acrylate/vinyl acetate hybrid latex
    Autorzy:
    Li, Y.
    Zhen, D.
    Liao, S.
    Zhu, D.
    Yang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/777851.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    coated urea
    ethyl cellulose/butyl acrylate/vinyl acetate
    hybrid latex
    emulsion polymerization
    controlled-release ability
    Opis:
    Fertilizer encapsulation through polymer membranes can reduce fertilizer losses and minimize environmental pollution. In this paper, an emulsion of ethyl cellulose (EC)/vinyl acetate (VAc)/butyl acrylate (BA) was successfully prepared by pre-emulsified semi-continuous seed emulsion polymerization. EC/BA/VAc films showed biodegradability. The influence of the EC content on the properties of EC/BA/VAc films was also investigated by DSC, a water absorbency analysis, etc. Controlled-release urea encapsulated by EC/BA/VAc latex was prepared in a film coating machine and conformed to the standards for slow-release fertilizers of the Committee of European Normalization. The release of urea from controlled-release urea encapsulated by EC/BA/VAc latex containing 0%, 5%, 10%, and 15% EC was 75.1%, 65.8%, 70.1% and 84.1%, respectively, after 42 days, and controlled-release urea encapsulated by EC/BA/VAc latex (5% EC) had the best controlled-release ability. Therefore, controlled-release urea encapsulated by EC/BA/VAc latex has many potential applications in agricultural industry.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 4; 108-112
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Toxicity of Medical Glove Materials: A Pilot Study
    Autorzy:
    Lonnroth, E. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/90537.pdf
    Data publikacji:
    2005
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    toxicity
    natural rubber latex
    synthetic rubbers
    synthetic polymeric materials
    toksyczność skórna
    toksykologia
    lateks
    rękawice izolujące
    materiały izolacyjne
    Opis:
    Cytotoxicity of 14 glove materials representing 4 natural rubber latex, 6 synthetic rubber and 4 synthetic polymeric materials was evaluated using dimethylthiazol diphenyltetrazolium (MTT), agar overlay and filter diffusion tests. Cell responses after contact with extracts of glove materials and contact with glove materials were assessed. One synthetic rubber glove (nitrile rubber) and 2 synthetic polymeric gloves (polyvinyl chloride) were non-toxic in all 3 tests, while 5 synthetic rubbers exhibited varying degrees of cytotoxicity, depending on the test. A severe cytotoxic response to both extracts of natural rubber latex materials and contact with natural rubber latex was verified in the 3 tests, indicating a need for consideration when selecting gloves, or other products, used in close skin contact.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2005, 11, 2; 131-139
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary Investigation on the Ballistic Limit of Ultra High Molecular Weight Polyethylene Unidirectional Coated Fabric System
    Wstępne badania balistyczne pakietów z pokrywanych tkanin typu UD wykonanych z polietylenu o ultra wysokiej masie cząsteczkowej
    Autorzy:
    Ahmad, M. R.
    Hassim, N.
    Ahmad, W. Y. W.
    Samsuri, A.
    Yahya, M. H. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/231828.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    unidirectional fabric
    natural rubber latex
    ballistic limit
    energy absorption
    pokrywana tkanina
    kauczuk naturalny
    lateks
    ograniczenia balistyczne
    absorpcja energii
    Opis:
    This paper reports an investigation on the ballistic impact performance of high strength unidirectional (UD) fabrics UHMWPE coated with natural rubber latex (NRL). The effects of adding calcium carbonate in the NRL on the ballistic impact were also studied. Several NRL coated UD fabrics were assembled together with neat UD fabrics in a 12-ply fabric system. The ballistic limit and energy absorption of the fabric systems were determined. Results of the ballistic limit test showed that the NRL coated UD fabrics gave some positive effects in enhancing the ballistic impact performance of the fabric systems in comparison with all-neat fabric systems. Several mechanisms of energy absorption were observed on the fabric systems which include burn marks, fibre stretching, fibre pull-out, shearing, delamination of fabric plies for completely penetrated fabric systems and a punched-out effect on the back ply of partially penetrated fabric systems.
    Badania dotyczyły efektu uderzenia pocisku w balistyczny pakiet wykonany z pokrywanych naturalną gumą tkanin typu UD wykonanych z polietylenu o ultra wysokiej masie cząsteczkowej. Dodatkowo badano wpływ dodania węglanu wapnia do kauczuku naturalnego. W pakietach składano tkaniny powlekane i niepowlekane w systemy zawierające do 12 warstw. Określano limit balistyczny i energię absorpcji uzyskanych pakietów. Wyniki badań wskazują, że powlekanie warstw gumą naturalną daje pozytywne efekty poprawiając zachowanie pakietu na uderzenie pocisku. Obserwowano pojawianie się przypalenia pakietów, rozciąganie włókien, wyciąganie włókien, ścinanie, delaminację pakietów aż do całkowitej penetracji wszystkich warstw systemu.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2013, 3 (99); 89-94
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of fibrinogen monolayers on mica by the colloid enhancement
    Autorzy:
    Nattich-Rak, M.
    Adamczyk, Z.
    Wasilewska, M.
    Radziszewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/363140.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    adsorpcja lateksu
    fibrynogen
    koloidalne wzmocnienie warstw białkowych
    monowarstwy fibrynogenu na mikach
    adsorpcja nieodwracalna
    cząstki koloidalne
    adsorption of latex
    fibrinogen
    colloid enhancement of protein layers
    fibrinogen monolayers by mica
    irreversible adsorption
    colloid particles
    Opis:
    Physicochemical properties of bovine plasma fibrinogen (Fb) in electrolyte solutions were characterised, comprising the diffusion coefficient (hydrodynamic radius), electrophoretic mobility (zeta potential) and the isoelectric point, found to be at pH=5.8. Similar electrokinetic measurements were performed for the mica substrate using the streaming potential cell. The kinetics of Fb adsorption on mica under diffusion-controlled transport was also studied. The surface concentration of Fb on mica was determined directly by AFM counting. By adjusting the time of adsorption, and bulk Fb concentration, monolayers of desired coverage were produced. It was confirmed that Fb adsorbed irreversibly on mica both at pH=3.5 and pH=7.4 (physiological value). It was postulated that in the latter case, where both the substrate and fibrinogen molecules were negatively charged, adsorption was due to heterogeneous charge distribution over the protein molecule. In order to check this hypothesis, monolayers of Fb on mica were studied using the colloid enhancement (CE) method, in which negatively and positively charged latex particles were used. Results of these experiments were quantitatively interpreted in terms of the fluctuation theory assuming that adsorption sites consisted of two and three Fb molecules, for pH=3.5 and 7.4, respectively. This allowed one to determine limits of applicability of the classical DLVO theory and confirm a heterogeneous charge distribution over the Fb molecule. It was also concluded that the CE method can be used for a sensitive determination of the Fb bulk concentration for the range inaccessible for other methods, i.e., for 0.1ppm and below. Another effect of vital significance confirmed in this work was that for some range of fibrinogen coverage both the negative and positive latexes efficiently adsorbed. This indicates the formation of superadsorbing surfaces having potential significance for various filtration processes.
    Źródło:
    Environmental Biotechnology; 2011, 7, 1; 1-11
    1734-4964
    Pojawia się w:
    Environmental Biotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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