« Home « Kết quả tìm kiếm

Sodium azide

Tìm thấy 17+ kết quả cho từ khóa "Sodium azide"

Drugs and Poisons in Humans - A Handbook of Practical Analysis (Part 68)

tailieu.vn

H (1999) Influence of sodium azide on human bodies and its poisoning accidents.. (2000) Toxicity of sodium azide and determination of azide ions. (1990) Death following accidental sodium azide ingestion. (1989) Three fatal sodium azide poisoning

Nanocomposite copper metal as an efficient heterogeneous catalyst in click synthesis of 1,2,3-triazoles in aqueous media

tailieu.vn

The reaction proceeds by mixing organohalides, sodium azide, alkyne, and the catalyst in an aqueous medium to afford the desired products. The cost efficiency and recyclability of the catalyst up to six runs without appreciable loss of activity and high yields of products make this procedure greener..

Microbial deterioration of archaeological marble: Identification and treatment

tailieu.vn

Results of treating the infected marble piece with sodium azide (100 ppm) showed that it was efficient to completely stop the growth of all microbial isolates, which was shown from the re- sults of swabs taken after 48 h and 6 months giving no micro- bial growth.

Synthesis of new hexahydro-1H-isoindole-1,3(2H)-dione derivatives from 2-ethyl/phenyl-3a,4,7,7a-tetrahydro-1H-isoindole-1,3-(2H)-dione

tailieu.vn

Amino and triazole derivatives of hexahydro-1H-isoindole-1,3(2H)-dione were synthesized from the formed product by the opening reaction of the epoxide with sodium azide.

Nghiên cứu một số yếu tố ảnh hưởng của quy trình nhuộm rửa và cố định mẫu bệnh phẩm đến việc hoàn thiện xét nghiệm xếp loại miễn dịch bằng kỹ thuật phân tích tế bào dòng chảy

tailieu.vn

Dung dịch bảo quản TB: thành phần gồm có sodium azide 1%, huyết thanh bào thai bê 10% pha trong dung dịch PBS.. Kỹ thuật cố định và bảo quản bệnh phẩm:. Bước 1: chuẩn bị ống nghiệm chứa 10 7 bạch cầu đã xử lý phá hồng cầu, dung dịch cố định, dung dịch bảo quản.. Bước 3: thêm 2 ml dung dịch bảo quản, ly tâm tốc độ 500 g/5 phút, hút dịch nổi, giữ lại cặn.. Bước 4: thêm 2 ml dung dịch cố định, ủ trong 15 - 30 phút, 4 o C..

Doctor of Philosophy in biochemistry: Evaluation of some indian medicinal plants for antidiabetic and antioxidant activities - in vitro & in vivo study

tailieu.vn

After 60 sec, 2 ml of dichromate acetic acid reagent was added. 19.8 mg of DTNB in 100 ml of 1% sodium citrate solution.. To 0.2 ml of Tris buffer, 0.2 ml of EDTA, 0.1 ml of sodium azide and 0.5 ml of tissue homogenate were added. To the mixture, 0.2 ml of glutathione followed by 0.1 ml of H 2 O 2. After 10 min the reaction was arrested by the addition of 0.5 ml of 10% TCA, centrifuged and the supernatant was estimated for glutathione by the method of Ellman (1959)..

Synthesis, characterization, and antimicrobial activities of novel monosaccharide-containing Schiff base ligands

tailieu.vn

In the second reaction, we performed nucleophilic substitution of the tosyl group with an azide group.. To a solution of the 6- O -tosyl derivative of the monosaccharide (0.10 mol) in dimethylforamide (DMF) (50 mL) was added sodium azide (0.125 mol).

Synthesis and biological evaluation of quinoline-triazole and quinolone-triazole conjugates

tailieu.vn

Propar- gyl skeletons are reacted with aromatic and benzylic halides and sodium azide via a CuI/L-proline-catalyzed one-pot synthesis method, and novel quinoline-triazoles 1a–1c and 2a–2c and quinolone-triazoles 3a–3c are. Lane C, control, CT-DNA. Lane 1, CT-DNA + 500 µ g/mL of 1a. Lane 2, CT-DNA + 500 µg/mL of 1b. Lane 3, CT-DNA + 500 µ g/mL of 1c. Lane 4, CT-DNA + 500 µ g/mL of 2a. Lane 5, CT-DNA + 500 µg/mL of 2b. Lane 6, CT-DNA + 500 µ g/mL of 2c. Lane 7, CT-DNA + 500 µ g/mL of 3a.

Efficient multicomponent synthesis of 1,2,3-triazoles catalyzed by Cu(II) supported on PEI@Fe3O4 MNPs in a water/PEG300 system

tailieu.vn

Abstract: A highly dispersible and magnetically recoverable Cu-PEI@Fe 3 O 4 MNPs catalyst was prepared and success- fully applied in one-pot three-component coupling of terminal alkynes, sodium azide, and alkyl bromides/chlorides in water to give 1,4-disubstituted 1,2,3-triazoles with good to excellent yields. The Cu-PEI@Fe 3 O 4 MNPs catalyst was prepared as presented in the Scheme.

Adsorption of cellulase on poly(2-hydroxyethyl methacrylate) cryogels containing phenylalanine

tailieu.vn

The cryogel was washed with 50 mL of distilled water and stored in distilled water containing 0.02% sodium azide (NaN 3 ) at +4 ◦ C until use.. To determine the swelling ratio of the cryogel (S), it was washed with water until the washing solution became clear. C in an oven, the mass of the cryogel was determined (m dry gel. A piece of the cryogel was saturated with deionized water.

HPLC fluorescence determination of ochratoxin A utilizing a double internal standard and its application to poultry feed

tailieu.vn

All dilutions were made from this stock solution using the same solvent prior to the analysis for the calibration and optimization studies. 20 For the preparation of PBS, a mixture of 19 mL of 0.2 M sodium dihydrogen phosphate, 81 mL of 0.2 M disodium hydrogen phosphate, 14.04 g of sodium chloride, 0.402 g of potassium chloride, and 1.0 g of sodium azide was utilized and was adjusted to pH 7.4, and made up to 200 mL. They were dissolved in 30 mL of methanol.

Isoquinoline-substituted triazole and pyran derivatives: synthesis and computational studies

tailieu.vn

Isoquinoline homopropargyl alcohol 2 was subjected to a one-pot two-step procedure by reaction with sodium azide and a halide (Scheme 1). Both aromatic and allylic halides were employed under optimized conditions and finally novel isoquinoline-substituted 1,2,3-triazole derivatives 3–8 were achieved in moderate to good yields (Table 1).. Synthesis of pyran derivatives.

Azolylimidazoles: Synthetic strategies and medicinal applications

tailieu.vn

Diazotization of 1-acetamido-5-amino-4-cyanoimidazole 114 using sodium nitrite in aqueous acetic acid followed by reaction with sodium azide gave 5-azido-4-cyanoimidazole 115 in 94% yield. Reaction of 115 with active methylene compounds 116 in the presence of a base led to imidazolyltriazoles 117 (Scheme 36). The imidazolyltriazole 120 was prepared by treatment of ethyl 1 H -imidazole-2-carbimidate 118 with acetohydrazide to give 119, which was then cyclized in acetic acid (Scheme 37).

Laccase bound to cryogel functionalized with phenylalanine for the decolorization of textile dyes

tailieu.vn

PHEMAPA cryogel discs were stored in 0.02% sodium azide solution until they are used.. Characterization of PHEMAPA cryogel discs. To determine polymerization yield, PHEMAPA cryogel discs were dried at vacuum oven and weighed. Swelling degrees of PHEMAPA cryogel discs were calculated according to Eq. Weights of PHEMAPA cryogel discs (m wet gel) were determined. Then, cryogel discs were dried at 55°C and weighted (m dried gel.

Purification and characteration of xylanase from aspegillus oryzae VTCC F187

tailieu.vn

The enzyme activity of the purified xylanase was determined in the presence of 10 mM of EDTA, NaN 3 (sodium azide), and 2% (w/v) of DMSO (dimethyl sulfoxide), SDS. Purification of xylanase from A. oryzae VTCC F187. oryzae VTCC F187 exhibited the highest xylanase activity at 1286.0 IU/mg. oryzae VTCC F187 xylanase, with molecular weights of 32 kDa (Fig. SDS-PAGE of xylanase putified by sephadex G75 (B) (Lane 1: crude supernatant.

Novel N-acyl/aroyl-2-(5-phenyl-2H-tetrazol-2-yl)acetohydrazides: synthesis and characterization

tailieu.vn

Some pharmacologically important tetrazole derivatives reported in the literature.. 1 H and 13 C NMR spectra were determined in CDCl 3 at 300 and 75 MHz, respectively, using a Bruker AM-300 spectrophotometer (Billerica, Middlesex, MA, USA). 5-Phenyl tetrazole was prepared according to the literature procedure. 2 A mixture of sodium azide (3 mmol), benzonitrile (0.20 g, 2 mmol), and zinc(II) chloride (0.40 g, 3 mmol) was suspended in H 2 O (16 mL) and the reaction mixture was refluxed for 15 h.

Phuong Phap Dinh Luong Protein

www.scribd.com

Đ i ề u này là t ố i quan tr ọ ng, đặ c bi ệ t khi protein đượ c cách li để ti ế n hành các phân tích sâu h ơ n (ví d ụ nh ư đ i ệ n di), môi tr ườ ng cách ly bao g ồ m nh ữ ng ch ấ t ng ă n ng ừ a s ự t ạ p nhi ễ m c ủ a vi khu ẩ n (VD: 0,1 mM sodium azide), b ả o v ệ protein kh ỏ i nh ữ ng ch ấ t t ạ o ph ứ c (VD: Cu.

Molecular Biology Problem Solver 39

tailieu.vn

Sodium azide may be used as a preservative at 0.02%.. The actual antibody concentration in working solutions is so low that without added carrier, much of the antibody would be lost to adsorption to the walls of containers. Nonfat dry milk is not recommended, since it is not as clean as laboratory grade albumin and is prone to bacterial growth.. SECONDARY REAGENTS. A wide variety of secondary reagents can be used to detect primary antibodies.

Solid: Sodium Ions

tailieu.vn

The Beevers–Ross (BR) site (ideally 2d and 1/4) accommodates the greater part of the sodium for beta alumina near the center of the composition range (i.e., xB0.20–0.3). The remainder of the sodium is slightly displaced from the mid-oxygen position (6 h .

Báo cáo tóm tắt đề tài khoa học và công nghệ cấp Bộ: Nghiên cứu điều chế phức [Cu(CH3CN)4]PF6 và ứng dụng làm xúc tác trong phản ứng đóng vòng giữa azide và ankin-1

tailieu.vn

VÀ ỨNG DỤNG LÀM XÚC TÁC TRONG PHẢN ỨNG ĐÓNG VÒNG GIỮA AZIDE VÀ ANKIN-1. THÔNG TIN KẾT QUẢ NGHIÊN CỨU 1. Tên đề tài: Nghiên cứu điều chế phức [Cu(CH 3 CN) 4 ]PF 6 và ứng dụng làm xúc tác trong phản ứng đóng vòng giữa azide và ankin-1. Chế tạo được phức [Cu(CH 3 CN) 4 ]PF 6 và ứng dụng làm xúc tác trong phản ứng đóng vòng giữa azide và ankin-1.. Nghiên cứu điều chế thành công phức [Cu(CH 3 CN) 4 ]PF 6.