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Nitric acid
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This study would like to point out the potential compounds as inflammatory agents. Herein, we displayed the isolation and structural identification of thirteen compounds including ten flavonoids, one tannin, one triterpenoid, and one derivative of benzoic acid from the methanolic extract. Furthermore, all of them were evaluated the anti-inflammatory activity.
12p
dianmotminh02
03-05-2024
1
1
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The aim of the present study is to investigate the anti-inflammatory effect of gallic acid grafted onto COS chains (GA-COS), focusing on the reduction of nitric oxide production, downregulation of inflammatory signals such as inducible nitric oxide synthase (iNOS), gene expression of cytokines such as TNF-α, IL-1β, IL-6, and nuclear factor kappa B (NF-κB) signalling, including the p50 and p65 subunits.
8p
viellison
28-03-2024
2
1
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Ebook "Paul J. Crutzen: A pioneer on atmospheric chemistry and climate change in the anthropocene" contains texts by the Nobel laureate Paul J. Crutzen who is best known for his research on ozone depletion. It comprises Crutzen’s autobiography, several pictures documenting important stages of his life, and his most important scientific publications. The Dutch atmospheric chemist is one of the world’s most cited scientists in geosciences.
260p
coduathanh1122
27-03-2024
3
1
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TaiLieu.VN giới thiệu đến các bạn “Đề thi học kì 1 môn Hoá học lớp 11 năm 2023-2024 - Trường THPT Nguyễn Trân, Bình Định” để ôn tập nắm vững kiến thức cũng như giúp các em được làm quen trước với các dạng câu hỏi đề thi giúp các em tự tin hơn khi bước vào kì thi chính thức.
4p
boghoado022
27-01-2024
8
3
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"Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels" cover the following five tests: practice A — Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 4 to 13, inclusive); practice B — Ferric Sulfate-Sulfuric Acid Test for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels (Sections 14 to 25, inclusive); practice C — Nitric Acid Test for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels (Sections 26 to 36, inclusive);...
20p
hth_hn_vn
10-12-2023
9
4
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“Đề thi giữa học kì 1 môn Hóa học lớp 11 năm 2023-2024 - Trường THPT Lê Hồng Phong, Đắk Lắk” là tài liệu hữu ích giúp các em ôn tập cũng như hệ thống kiến thức môn học, giúp các em tự tin đạt điểm số cao trong kì thi sắp tới. Mời các em cùng tham khảo đề thi.
3p
kimphuong1142
28-11-2023
4
2
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Phương pháp quang phổ plasma nguồn cảm ứng cao tần kết nối khối phổ (ICP-MS) được áp dụng để xác định hàm lượng các kim loại nặng (Pb, Cd, As, Hg) trong các mẫu thực phẩm và thức ăn chăn nuôi tại Viện Kiểm nghiệm an toàn vệ sinh thực phẩm quốc gia do có độ chính xác cao và đáp ứng nhanh về thời gian. Mẫu thử được phân hủy trong lò vi sóng sử dụng hỗn hợp acid nitric và hydro peroxyd, cùng với chất nội chuẩn yttrium được thêm vào ngay từ đầu nhằm kiểm soát quá trình phân tích.
8p
vischultz
17-10-2023
5
3
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Luận án Tiến sĩ Dược học "Nghiên cứu đặc điểm thực vật, thành phần hoá học và tác dụng kháng viêm của một số loài thuộc chi Balanophora J.R. & G.forst. ở Việt Nam" trình bày xác định chính xác tên khoa học, mô tả đặc điểm thực vật một số loài thuộc chi Balanophora ở Việt Nam; Nghiên cứu thành phần hóa học các loài thu được; Đánh giá một số hoạt tính in vitro của cắn chiết các loài nghiên cứu và lựa chọn một loài có hoạt tính tốt để đánh giá tác dụng kháng viêm, hạ acid uric.
264p
vineville
03-02-2023
12
8
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Ammonium dinitramide (ADN) is one of the potential oxidants in solid propellant formulations because it is environmentally friendly, has a high specific impulse, and has minimum signature exhaust gases. ADN was synthesized through the nitration reaction of potassium sulfamate salt with a mixture of sulfuric acid and nitric acid.
8p
visirius
19-01-2023
8
2
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This paper presents an extension to a point kinetics model of fissile solution undergoing a transient through the development and addition of correlations which describe neutronics and thermal parameters and physical models.
9p
vironald
15-12-2022
7
4
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Two novel extraction chromatography resins (ECRs) containing two diglycolamide (DGA) -functionalized calix[4]arenes with n-propyl and isopentyl substituents at the amide nitrogen atom, termed as ECR-1 and ECR-2, respectively, were evaluated for the uptake of Th(IV) from nitric acid feed solutions.
9p
viginny
23-12-2022
7
2
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The aim of the work "Activated Carbon Prepared from Rice Husk: Nitric Acid Modification and BTX Adsorption" is to evaluate the elimination of BTX by activated carbons prepared from rice husk. The effects of surface modification on the specific surface area, pore texture and adsorption capacity of the AC samples have been examined.
5p
runordie3
27-06-2022
8
2
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In the work "Adsorption behavior of Pb(II) in aqueous solution using coffee husk-based activated carbon modified by nitric acid", activated carbon (AC) was prepared from coffee husk and modified by nitric acid for effective lead ions removal from aqueous solution. The as-prepared samples have uniform particles size, developed surface area and contain acidic surface functional groups. Nitric acid modification showed a pronounced effect on improving Pb(II) adsorption capacity.
10p
runordie3
27-06-2022
9
2
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This paper investigated the presence of cadmium and lead in the tissue samples of three marine shrimps taken from three major landing sites in the area. The samples were processed using nitric acid digestion and the heavy metal concentrations were analyzed using Atomic Absorption Spectroscopy (AAS).
8p
vimegwhitman
10-06-2022
8
1
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Pb ions can react sensitively with dibromo-p-methylsulfonazo (DMSA) to form a blue complex, whose absorption is maximal at 630 nm. By means of the light-absorption ratio variation approach (LARVA), the direct determination of Pb was developed in 0.3 M nitric acid and plots of ∆A−1r vs. c−1Pb are linear where ∆Ar is the lightabsorption ratio variation and cP b Pb(II) concentration is between 0 and 5.0 mg/L. The limit of detection (3σ) of Pb(II) is only 0.02 mg/L. This method was applied to direct analysis of natural water with satisfactory results.
6p
langthannam
29-12-2021
17
0
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A laboratory method for the acid-free synthesis of S-nitrosothiols (RSNO) from NaNO2 and thiols in aqueous buffer of neutral pH is reported. Equimolar amounts of NaNO2 and thiol are added to a 100-µM Na 4EDTA-containing Na2HPO4 buffer (100 mM, pH 7.4). Samples are set into liquid nitrogen for 1 min and then thawed to room temperature or in an ice bath. Dependent upon the RSNO, repetition of the procedure may be required. This method may be of particular importance when the classical acid-based method fails or releases harmful gases such as H2S.
7p
langthannam
29-12-2021
11
0
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Our studies on the selective catalytic reduction of NO (SCR-deNO) properties of M/γ-Al2O3 (M = Mn, Co, Cu) nanocatalysts are presented. All catalysts were prepared by homogeneous deposition precipitation using urea as the precursor for the precipitating agent. The SCR activity followed the order Mn/γ-Al2O3 > Cu/γ-Al2O3 > Co/γ-Al2O3. The nanocatalysts were characterized with respect to their texture (N2-BET), particle size (TEM), reducibility (H2-TPR), and acidity (NH3-TPD).
10p
langthannam
29-12-2021
9
0
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The present article describes a method of determination of low antimony concentrations using a graphite furnace AAS technique after electrochemical preconcentration. A 2-electrode flow-through cell was developed with a working electrode made of gold-coated porous carbon and an accessory Pt electrode. This cell worked in online coupling with the graphite furnace atomizer. Accumulation occurred from the 6 M hydrochloric acid solution and 2M nitric acid was used to dissolve and transport antimony into the sampling loop. The sampling loop was placed on a 6-way valve.
8p
tudichquannguyet
29-11-2021
6
1
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Chemical investigation of the marine sponge-derived fungal strain Aspergillus sp. IMBC-FP2.05 resulted in isolation of five compounds, including JBIR-74 (1), homogentisic acid (2), methyl (2,5-dihydroxyphenyl)acetate (3), 3- chloro-2,5-dihydroxybenzyl alcohol (4), and p-hydroxybenzaldehyde (5). Their chemical structures were identified by comprehensive analyses of the 1D and 2D NMR and mass spectra in comparison with the previously reported data. Furthermore, nitric oxide (NO) inhibitory effects of the isolated compounds in LPS-stimulated RAW264.7 cells were also reported.
5p
nguaconbaynhay11
16-04-2021
9
2
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Luận văn nghiên cứu chế tạo mẫu bột nano BiFe1-xMnxO3 với x = 0,00; 0,05; 0,055; 0,06; 0,065; 0,07 bằng phương pháp sol – gel sử dụng acid citric và acid nitric; nghiên cứu ảnh hưởng của tỉ lệ tạp Mn lên sự hình thành pha, các đặc trưng cấu trúc và tính chất từ của hệ mẫu chế tạo được. Mời các bạn cùng tham khảo.
63p
capheviahe28
01-03-2021
30
2
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