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    Wyświetlanie 1-11 z 11
    Tytuł:
    Identification of Vietnamese Ochna integerrima (Lour.) merr species based on ribosomal DNA internal transcribed spacer sequence
    Autorzy:
    Trang, D.H.
    Van Dong, D.
    Chung, B.H.
    Gioi, D.H.
    Khanh, T.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/11712.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Źródło:
    International Letters of Natural Sciences; 2018, 68
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of fisheries resources in national development: a review
    Autorzy:
    Rabo, P.D.
    Zarmai, D.U.
    Jwanya, B.A.
    Dikwahal, S.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/11365.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    This paper on the role of Fisheries resources in National development is aimed at highlighting the role of Fishery products in Nation building. Fishery products of finned Fish species like Cod, Flounder, Salmon, Catfish, Goldfish, Sea urchins, Shrimps, King crab, Halibut, Mollusk and Echinoderms that come from both capture Fisheries and Aquaculture provide employment, food security, improves welfare, nutrition and a healthy population. Also serve for International trade and foreign exchange in goods like Leather and polishing materials that come from the skin of Cartilagenous Fishes. Ice Fish, dried and canned Fishery products, Salmon roe (egg) and Fish oil used for the manufacture of Soap and Medicinal Oils like the Cod Liver Oil. Fish intake also reduces the condition atherosclerosis thereby combating cardiovascular diseases. However, the Fishery Subsector has some constraints such as by Catch, improper funding, poor input Facilities, Poverty in Fishing Communities, Water barriers, effect of climate change and lack of comprehensive Man power development and training programmes. It is therefore recommended that Government, Donor agencies and international trade unions make effort to increase the educational and capital base of small-scale Farmers; distinguish between Farmed and Wild products, provides Comprehensive Man power and training programmes for all Cadre, providing transportation systems for better appreciation and Productivity in the fishery sub-sector. Laws and by-laws should also be enacted to prevent indiscriminate fishing to avoid over exploitation and extinction of our Aquatic Species.
    Źródło:
    International Letters of Natural Sciences; 2014, 13, 1
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gardens planted with macrophytes filters, purification performance in an arid climate. Pilot station of Témacine, Ouargla (Algeria)
    Autorzy:
    Belkaçem, H.
    Abdelhafidh, D. B. A.
    Zineb, H.
    Saad, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/412364.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    wastewater
    treatment
    phytopurification
    arid climat
    bed planted
    macrophytes
    Opis:
    In this study, we are interested in evaluating the performance of a system for purifying wastewater by plants in an arid climate. The treated water is wastewater from domestic sources in the region of the old Ksar Temacine (Wilaya of Ouargla, South-East of Algeria). The results show good yields for organic and particulate pollution. Drawdown rate of approximately 97.49 % of Suspended Solids (SS), 90.85 % of Chemical Oxygen Demand (COD), have been achieved. The system effectively removes nitrate pollution 100 % of ammonium and phosphorus pollution moderately 62.28 % of orthophosphates. The system shows a very high removal of total coliforms (90 %).
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 8, 3; 259-268
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deployment of Antepsin (Sucralfate) as Corrosion Inhibitor of Mild Steel in H2SO4 Medium: Chemical and Electrochemical Studies
    Autorzy:
    Udeh, B. C.
    Onukwuli, O. D.
    Omotioma, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839460.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Antepsin
    Corrosion
    H2SO4
    Inhibitor
    Mild Steel
    Opis:
    This study presents the deployment of antepsin (sucralfate) as corrosion inhibitor of mild steel in H2SO4 medium. Chemical (gravimetric) and electrochemical (potentiodynamic polarization and electrochemical impedance spectroscopy) techniques were used in the corrosion control investigation. The antepsin drug was characterized by gas chromatography mass spectrophotometer (GCMS) and Fourier transform infrared (FTIR) spectroscopy. Effects of inhibitor concentration, temperature and time on weight loss, corrosion rate, inhibition efficiency and degree of surface coverage were examined. Thermodynamic and adsorption properties of the corrosion inhibition process were determined. Inhibition efficiency was optimized using central composite design tool of Design Expert software version 12. Potentiodynamic polarization and electrochemical impedance spectroscopy were employed to determine the type and effectiveness of the inhibitor. As a confirmatory test, scanning electron microscopy (SEM) was employed to examine the surface morphology of the mild steel samples. Analysis of the results showed that major constituents of antepsin include tetradecanoate, metronidazole, hexadecanoic acid, methyl ester and 11-octadecenoic acid. The predominant functional groups include; C=O stretch, C-H bend and symmetric and asymmetric =C-O-C. Adsorption of the molecules of antepsin on the surface of the mild steel was spontaneous and occurred in agreement with physical adsorption. A quadratic model adequately described the relationship between inhibition efficiency and corrosion control variables of concentration of the inhibitor, temperature and time. Optimum inhibition efficiency of antepsin was obtained as 86.75%. Chemical and electrochemical results agreed that antepsin is suitable for corrosion control of mild steel in H2SO4 solution. Antepsin acted as mixed-type inhibitor (controlled both cathodic and anodic reactions).
    Źródło:
    World News of Natural Sciences; 2021, 37; 117-134
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PEG mediated eco-friendly one pot sunthesis of benzylamine coumarin derivatives using multicomponent reactant
    Autorzy:
    Viradiya, D. J.
    Kotadiya, V. C
    Khunt, M. D.
    Baria, B. H.
    Bhoya, U. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/412545.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    one pot reaction
    benzylamine coumarin derivative
    green synthesis
    PEG-400
    Opis:
    A green resourceful, eco-friendly and facile protocol was developed for the synthesis of benzylamine coumarin derivatives by the reaction of 4-hydroxy coumarin, secondary amine and aromatic aldehyde in the presence of PEG400 as a solvent as well as catalyst at room temperature. A wide range of functional groups were tolerated in the developed protocol. The structures of all the synthesized compounds were confirmed by 1H NMR, IR, MASS and Elemental Analysis. The target molecules were obtained in good to excellent yield applying this method.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 11, 2; 177-184
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analysis and benefits of digital library over traditional library
    Autorzy:
    Bamgbade, B. J.
    Akintola, B. A.
    Agbenu, D. O.
    Ayeni, C. O.
    Fagbami, O. O.
    Abubakar, H. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193861.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Analysis
    Benefits
    Digital library
    Information Communication Technology
    Traditional library
    Opis:
    The paper reviews the relevance of Information Communication Technology (ICT) as related to other professions especially, the Library professions. The importance, advantages and limitations of digital library over the traditional library were emphasized. The comparative analyses of the two types of libraries were also discussed. Governments in all tiers of the Nation and Legislators were advised to make policies and legislate bills respectively that can advance the present state of the National grid and improve on the Internet technology infrastructures which are major factors that can drive digitization.
    Źródło:
    World Scientific News; 2015, 24; 1-7
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Easy, Simplistic and Green Synthesis of Various Benzimidazole and Benzoxazole Derivatives Using PEG400 as a Green Solvent
    Autorzy:
    Khunt, M. D.
    Kotadiya, V. C.
    Viradiya, D. J.
    Baria, B. H.
    Bhoya, U. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/411999.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    PEG-400
    Benzimidazole
    Benzoxazole
    Green synthesis
    Opis:
    An improved environmentally benign procedure for the synthesis of various benzimidazole and benzoxazole derivatives using green solvent PEG400. We have optimized the reaction condition and it was found that PEG400 was believed to be best as compared to PEG200, PEG600 and PEG800 at 80 to 85 °C. This method provides a novel route for the synthesis of benzimidazole and benzoxazole derivatives. The main attractive features of this process are a mild reaction conditions, easy workup procedure and good to excellent yield. The structures of all the synthesized compounds were confirmed by 1H NMR, IR, MASS and Elemental Analysis.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 6; 61-68
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave assisted synthesis of 2,5-distyryl-1,3,4-oxadiazole derivatives as anti microbial agents
    Autorzy:
    Namera, D. L.
    Rathod, J. B.
    Maheta, R. H.
    Bhoya, U. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/411519.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    substituted cinnamic acid
    substituted 1,3,4-oxadiazoles
    antimicrobial activity
    Opis:
    A new series of 2,5-distyryl-1,3,4-oxadiazoles derivatives have been synthesized from cinnamic hydrazide on reaction with various cinnamic acid derivatives. The structures of synthesized compounds have been elucidated by spectral studies like IR, 1HNMR, Mass and also Elemental Analysis. Furthermore, all synthesized compounds were screened for in vitro anti microbial activity against the gram positive (Staphylococcus aureus, Pseudomonas aeruginosa) and gram negative (Escherichia coli) bacterial strain. In which some the compounds show potential inhibition against the test organisms.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 10; 46-54
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Highly efficient and eco-friendly one-pot synthesis of penta substitute pyrrole derivatives under catalyst-free conditions
    Autorzy:
    Viradiya, D. J.
    Baria, B. H.
    Kakadiya, R.
    Kotadiya, V. C.
    Shah, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/412605.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    one-pot synthesis
    penta-substituted pyrrole derivatives
    multi-component reactions
    Opis:
    An eco-friendly and efficient one-pot synthesis of penta-substituted pyrrole derivatives via a four-component reaction of maldrum’s acid, arylglyoxal monohydrate, dimethyl but-2-yne-dioate and amines under catalyst-free conditions in an environmentally friendly medium is described. The simple experimental procedure, catalyst-free reaction conditions, short period of conversion, and excellent yields are the advantages of the present method. Good chemical yields have been achieved without the need for chromatography and recrystallization or other purification methods.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 11, 3; 257-264
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design, Synthesis, Characterization and Biological evaluation of (4-(7-chloroquinolin-4-yl)piperazin-1-yl)(substitutedphenyl)methanones as antimicrobial agents
    Autorzy:
    Parmar, Nilesh D.
    Hadiyal, Sanjay D.
    Kapupara, Vimal H.
    Kalavadiya, Prakash L.
    Gojiya, Dinesh G.
    Bhatt, Tejal
    Vekariya, Mitesh B.
    Chovatiya, Pankaj J.
    Joshi, Hitendra S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075589.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Chloroquinoline
    antimicrobial agents
    multistep synthesis
    piperazine
    Opis:
    A series of (4-(7-chloroquinolin-4-yl)piperazin-1-yl)(substitutedphenyl)methanones were prepared via multistep synthesis which involved acrylation without base, cyclisation, hydrolysis, decarboxylation, electrophilic chlorination reactions and subsequent chloro-amine coupling with various substituted benzoyl chloride derivatives. The structure of the synthesized compounds was established by using elemental analysis, FT-IR, 1H NMR, 13C NMR and Mass spectroscopy. All the novel compounds have been tested on thin layer chromatographic plate for purity and evaluated for their antimicrobial activity against gram positive and gram negative bacteria which demonstrated moderate to good antimicrobial activity.
    Źródło:
    World Scientific News; 2019, 122; 193-205
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel conversion of 4-aminoquinolines to new tricyclic (R,S)-3-methylazeto[3,2-c] quinolin-2(2aH)-ones and versatile one step synthesis of N-(quinolin-4-yl) carbamates from 4-aminoquinolines
    Autorzy:
    Kotadiya, V. C.
    Viradiya, D. J.
    Baria, B. H.
    Kanzariya, J. S.
    Kakadiya, R.
    Shah, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/412269.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    quinolin
    carbamates
    azeto-quinolinone
    aminoquinolines
    Opis:
    Reaction of 4-aminoquinolines with 4-nitrophenyl chloroformate have resulted in finding a novel transformation of 4-aminoquinolines to tricyclic (R,S)-3-methylazeto[3,2-c]quinolin-2(2aH)-ones. The structure of azeto-quinolinone was determined via spectroscopic and chemical methods. Various alcohols were used as nucleophiles to open the 1-azetinone ring to give the corresponding N-(quinolin-4-yl)carbamates in good yields. We also found a new and versatile one step synthesis of N-(quinolin-4-yl)carbamates by reacting 4-aminoquinolines with alkyl chloroformates in the presence of anhyd K2CO3 in acetonitrile.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 11, 3; 265-276
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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