• Fish species composition in the Red river and its tributaries in the Yen Bai province, VietnamFish species composition in the Red river and its tributaries in the Yen Bai province, Vietnam

    Abstract. The fish community of the Red River and its four tributaries (Ngoi Hit, Ngoi Thia, Ngoi Lao and an unnamed Ngoi) was elucidated from October 2009 to August 2010. During the period of study, 110 species belonging to 69 genera, 20 families and 7 orders were identified. Previous works have identified 120 species, 74 genera, 20 families a...

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  • Fish species composition and their distribution of the Pho Day river, Northern VietnamFish species composition and their distribution of the Pho Day river, Northern Vietnam

    Abstract. In six surveys conducted at 11 locations along the Pho Day River, Northern Vietnam, from April 2006 to April 2007, 1203 fish specimens were collected and analyzed. 87 species of fish of 66 genera, 20 families and 6 orders were found. No survey of Pho Day fish fauna had previously been conducted. Perciformes is the most diverse with 7 ...

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  • Colormetric determination of total chromium content in water, rice and vegetable samples by 1,5-diphenylcarbazideColormetric determination of total chromium content in water, rice and vegetable samples by 1,5-diphenylcarbazide

    Abstract. A colorimetric determination the total chromium content based on DPC reagent was established in detail. All operations were done under the optimal conditions of pH = 1.65, a ratio of nDPC/nCr(VI) = 2.18 (by mol) and use of a calibration plot for the determination of total chromium established as A = (0.8324 ± 0.00901).CCr + (0.0086 ± ...

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  • Research on the production of candied orange slicesResearch on the production of candied orange slices

    Processing candied orange slices is one of the basic measures to help prolong the shelf life of products compared to raw oranges. The purpose of this study is to create candied orange slice products from chanh orange with good nutritional and organoleptic value, contributing to diversifying jam products in the market and increasing income for ...

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  • Study on factors affecting the processing of tilapia chopped fishStudy on factors affecting the processing of tilapia chopped fish

    The objective of this study was to determine the effects of some factors including food additive supplementation, grinding time, and cooking time on the sensory quality of tilapia grilled chopped fish. Fishes were decapitated, gutted, filleted manually, washed, and mixed with different food additive supplementation (flour, cornstarch, sodium t...

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  • Determining the prevalence of Helicobacter pylori infection by molecular identification of 16s rRNA in gastric patients in Hai Duong provincial general hospitalDetermining the prevalence of Helicobacter pylori infection by molecular identification of 16s rRNA in gastric patients in Hai Duong provincial general hospital

    Abstract. In this study, 180 gastric biopsies were taken from patients of Hai Duong Provincial General Hospital who had come to the hospital to be treated for gastritis during the period January 2015 to July 2015. All of the subjects were i) 18-80 years old; ii) they had chronic gastritis, a stomach ulcer or gastric cancer; iii) they did not use...

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  • Preparation of TiO2 nanocrystals in anatase and rutile phasePreparation of TiO2 nanocrystals in anatase and rutile phase

    Abstract. TiO2 nanocrystals were prepared by pyrolysis of titanium tetrachloride (TiCl4) as precursor in an HCl aqueous solution at 80 ºC. The morphology and crystal structure of the resulting materials were characterized using a transmission electron microscope (TEM), X-Ray diffraction (XRD) and Raman spectroscopy. The concentration of the HCl...

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  • Synthesis of CdSe/CdS AND CdSe/CdS/SiO2 nanoparticles VIA wet chemical methodSynthesis of CdSe/CdS AND CdSe/CdS/SiO2 nanoparticles VIA wet chemical method

    Abstract. This work presents the synthesis of CdSe/CdS and CdSe/CdS/SiO2 nanoparticles via wet chemical method for the purpose of preparing fluorescence SiO2 nanoparticles. The CdSe/CdS nanoparticles have been synthesized directly in an aqueous solution using citrate as the surfactant agent. The CdSe/CdS nanoparticles are then coated by a silic...

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  • The effect of microorganism fertilizer on the growth and Cu accumulation of lettuce (Lactuca sativa) grown on soil contaminated by CuThe effect of microorganism fertilizer on the growth and Cu accumulation of lettuce (Lactuca sativa) grown on soil contaminated by Cu

    Abstract. This paper presents the experimental results of the effect of microorganism fertilizer (MF) on growth, yield and accumulation of Cu in lettuce grown on soil contaminated by Cu. The results show that applying MF on soil that has a Cu content of 17.03-106.4 ppm has a positive affect on the height, fresh weight, total chlorophyll content and...

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  • Nghiên cứu biến tính dây nano SnO2 bằng phương pháp nhỏ phủ với dung dịch Cu(NO3)2 để cải thiện tính chất nhạy khí H2SNghiên cứu biến tính dây nano SnO2 bằng phương pháp nhỏ phủ với dung dịch Cu(NO3)2 để cải thiện tính chất nhạy khí H2S

    TÓM TẮT Dây nano SnO2 được biến tính với các hạt nano CuO bằng cách nhỏ phủ dung dịch đồng nitrat lên điện cực Si/SiO2 đã có dây nano SnO2. Dây nano SnO2 đã biến tính có độ đáp ứng khí H2S vượt trội so với cảm biến dây nano SnO2 chưa biến tính. Ở cùng nhiệt độ 250 C và với cùng nồng độ từ 0,25 đến 2,5 ppm H2S, độ đáp ứng khí (Ra/Rg) của cảm biến d...

    pdf7 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 459 | Lượt tải: 0