The acid test

This experiment aimed to synthesize isoamyl acetate and understand preparing ester’s mechanism. The test compounds underwent reflux, distillation, extraction and vacuum filtration. Through an acid, acetic acid could serve as a substrate. This could easily be attacked by isoamyl alcohol, thus producing isoamyl acetate.

4p thanhtrinhqc 23-08-2014 60 7   Download

The prediction of the expected long-term performance of concrete exposed to sewage and similar materials can be difficult as it is affected by a large number of parameters. In addition, the deterioration process in concrete is generally slow. The focus of the study was to ascertain the life expectancy of concrete septic tanks located in rural Victoria. In developing the accelerated test method, ASTM C 192, ASTM C 452, ASTM C 1293 and ASTM C 109 standard procedures were adopted wherever possible.

172p runthenight05 01-03-2023 12 3   Download

The study revealed that the tested compounds are moderate UVB absorbers, but could be used to augment the effect of other photoprotective agents. Their SPF values were in the range from 3.63 to 4.26 for salicylates 3a-d and from 3.03 to 3.51 for vanillates.

10p tocectocec 25-05-2020 13 3   Download

Thuật ngữ “THE ACID TEST” .Thuật ngữ THE ACID TEST được người ta sử dụng để kiểm tra, đánh giá giá trị thật sự của vật hay đồ vật. Người ta cũng sử dụng thuật ngữ này để kiểm tra, đánh giá năng lực thật sự của một người hay một tập thể. Vào thời kỳ lập quốc, nước Mỹ không có nhiều thành phố, thị trấn.

5p stylegau 21-06-2013 73 7   Download

The naturally synchronous plasmodia of myxomycetes synthesize poly(b-L-malic acid), which carries out cell-specific functions. In Physarum polycephalum, poly(b-L-malate) [the salt form of poly(b-L-malic acid)] is highly concentrated in the nuclei, repressing DNA synthetic activity of DNA polymerases by the formation of reversible complexes. To test whether this inhibitory activity is cell-cycle-dependent, purified DNA polymerase a of P.

6p research12 01-06-2013 64 3   Download

A novel plasmid vector pSELECT-1 is described which can be used for highly efficient site-directed in vitro mutagenesis. The mutagenesis method is based on the use of single-stranded DNA and two primers, one mutagenic primer and a second correction primer which corrects a defect in the ampicillin resistance gene on the vector and reverts the vector to ampicillin resistance. Using T4 DNA polymerase and T4 DNA ligase the two primers are physically linked on the template. The non-mutant DNA strand is selected against by growth in the presence of ampicillin.

5p zingzing09 24-04-2013 65 5   Download

OprM, the outer membrane component of the MexAB-OprM multidrug efflux pump ofPseudomonas aeruginosa, hasbeenassumed to facilitate the export of antibiotics across the outer membrane of this organism. Here we purified to homogeneity the OprM protein, reconstituted it into lipo-somemembranes, and tested its channel activitybyusing the liposome swellingassay. Itwas demonstrated thatOprMis a channel-forming protein and exhibits the channel property that amino acids diffuse more efficiently than saccharides....

8p research12 23-04-2013 43 4   Download

A new approach of predicting structural classes of protein domain sequences is presented in this paper. Besides the amino acid composition, the composition of several dipeptides, tripeptides, tetrapeptides, pentapeptides and hexapeptides are taken into account based on the step-wise discriminant analysis. The result of jackknife test shows that this new approach can lead to higher pre-dictive sensitivityand specificityfor reduced sequence similaritydatasets.

7p research12 23-04-2013 34 3   Download

Cold shock proteins (CSPs) form a family of highly conserved bacterial proteins capable of single-stranded nucleic acid binding. They are suggested to act as RNA chaperones during cold shock inhibiting the formation of RNA secondary structures, which are unfavourable for transcription and translation.

12p fptmusic 12-04-2013 38 2   Download

The small leucine-rich proteoglycan decorin can bind via its core protein to different types of collagens such as type I and type VI. To test whether decorin can act as a bridging molecule between these collagens, the binding properties of wild-type decorin, two full-length decorin species with single amino acid substitutions (DCN E180K, DCN E180Q), which previously showed reduced binding to collagen type I fibrils, and a truncated form of decorin (DCN Q153) to the these collagens were investi-gated. ...

0p awards 05-04-2013 34 2   Download

In our continued studies on corticotropin releasing factor receptor (CRFR1) signaling in the skin, we tested functional activity of CRFR1a, e, f, g and h isoforms after transfection to COS cells.Both membrane-bound and soluble variants are translatedin vivointofinal proteinproducts that undergo further post-translational modifications.

10p dell39 03-04-2013 45 3   Download

Excitatory amino acid release and subsequent biochemical cascades following traumatic brain injury (TBI) have been well documented, especially glutamate-related excitotoxicity. The effects of TBI on the essential functions of inhibitory GABA-A receptors, however, are poorly understood. Methods: We used Western blot procedures to test whether in vivo TBI in rat altered the protein expression of hippocampal GABA-A receptor subunits α1, α2, α3, α5, β3, and γ2 at 3 h, 6 h, 24 h, and 7 days post-injuy.

11p toshiba23 18-11-2011 52 4   Download

Viêm khớp trong gút được chẩn đoán như thế nào ? - Gút được nghi ngờ khi bịnh nhân khai có những cơn viêm đau khớp lập đi lập lại ở khớp bàn ngón. Kế đó là khớp cổ chân và gối. Gút thường chỉ bị mỗi lần một khớp trong khi ở những bệnh khác như lupus, viêm đa khớp dạng thấp, thường bị nhiều khớp cùng một lúc. - Test có giá trị nhất trong gút là xét nghiệm tinh thể acid uric lấy được khi chọc khớp. Chọc khớp được làm với gây tê tại chỗ, kỹ...

7p pstrangsang 21-12-2010 79 5   Download

The attributes which are essential for a battery to be successful as the energy store for an electric vehicle are reviewed. These are then matched against the substantial advances in the technology of valve-regulated lead–acid ŽVRLA. batteries that have been posted during the course of the technical programme of the Advanced Lead–Acid Battery Consortium ŽALABC.. A project which was designed to draw together several desirable features, identified during the early years of the ALABC programme, into a test battery has provided much useful information. ...

7p congdat261 19-11-2010 126 7   Download