the synthesis of cyclic compounds

... DEVELOPMENT OF NEW METHODOLOGIES FOR THE SYNTHESIS OF ENANTIOMERICALLY ENRICHED COMPOUNDS LEE CHENG HSIA ANGELINE (B.ApplSc (Hons.), NUS) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY ... published their innovation on the Lewis acid mediated reaction of crotyltins with aldehydes that produces the syn-homoallylic alcohols regardless of the geometry of the double bond of the allylic ... alcohols, there are no reported illustrations for the synthesis of the cis-linear regioisomer Herein, an effective and unusual approach towards the synthesis of enantiomerically cis-linear homoallylic...

Ngày tải lên: 16/09/2015, 08:30

Ngày tải lên: 19/02/2014, 15:20

... (ALO1), which catalyzes the last step in the biosynthesis of erythroascorbic acid in yeasts, resulted in attenuated virulence of the Candida albicans mutant [42] If synthesized by the Rv1771 l-gulono1,4-lactone ... the host proteases On the other hand, attempts to produce a His-tagged version of the The Rv1771 gene of M tuberculosis encodes a 428 amino acid protein (Fig 2) that shows 32% identity with the ... oxidoreductases In order to determine the enzymatic activity of the GST-tagged Rv1771 protein of M tuberculosis, the oxidase activity was tested in the presence of the l-gulono-1,4-lactone and l-galactono-1,4-lactone...

Ngày tải lên: 07/03/2014, 12:20

... content of 48.0% [43] The GC content of the region essential for the biosynthesis of SPA in the other serotype strains (b–e) of A actinomycetemcomitans is also lower than the average GC content of these ... [20] The GC contents of the genes essential for SPA biosynthesis in A actinomycetemcomitans SUNYaB 75 are lower than the average GC content (47.8%) of the genes flanking them The GC contents of ... spectrum of the product was at 590.1, which corresponds to the [M + H]+ ion of GDP-6deoxy-D-talose H NMR analysis of the structure of the purified GDP-6-deoxyhexose Approximately mg of the sugar...

Ngày tải lên: 17/03/2014, 10:20

... progresses, the growth proceeds along the active sites, resulting in the formation of elongated nanostructures in the form of rods We believe that because of the electrostatic interaction of the iron ... removal of the template by solvent extraction and calcinations, the FE-SEM micrograph (Fig 2B) reveals the remarkable effect on the macroscopic structure of the nanorods The presence of nanorods ... micelle of the surfactant helps in the morphology selectivity during the growth process The magnetic properties of the porous ␣-Fe2 O3 nanorods were further investigated using SQUID To investigate the...

Ngày tải lên: 19/03/2014, 16:48

... appropriated to that of the target-materials In addition, the concentration of the precursors seems to play a role on the control of the shape of nanocrystallites resulting of a solvothermal process ... in the solvothermal reactions The selection of the solvent plays a key-role through the control of the chemical mechanisms leading to the targetmaterial The reaction mechanisms induce, during the ... are involved during the solvothermal process: Hg2+?2Hg2+ + 2e– and Te + 2 e–?Te2– Then the reaction, with the precursor Rb2Te, leads to the synthesis of Rb2Hg3Te4 The use of FeCl2 as additive...

Ngày tải lên: 20/03/2014, 13:08

... mechanisms of metal oxide particles in non-aqueous synthesis This section will discuss the organic side of the synthesis of inorganic nanomaterials performed in non-aqueous, but liquid reaction media The ... and the organic reaction pathways play a fundamental role in the non-aqueous synthesis of the inorganic products In this process, the formal oxygen that is required for the fabrication of the ... with the precursor to form metal–oxygen–metal groups (Scheme 2, Eq 2) The combination of these two equations leads to the elimination of R–X and H–X The other possibility is the elimination of...

Ngày tải lên: 20/03/2014, 13:11

... volume of 20 lL The reaction was initiated by the addition the enzyme (100 ngÆreaction)1 for the determination of NTP synthesis rates and 0.5–1 ngÆreaction)1 for the determination of NDP synthesis ... levels for DNA synthesis could be the reason Mollicutes lack the de novo synthesis of purine and pyrimidine bases and have to rely on salvage path1988 ways for the biosynthesis of nucleotides ... (d)CMP Discussion The aim of the present study was to define the role of Ureaplasma NMPKs in the synthesis of nucleoside triphosphates Four Ureaplasma NMPKs were cloned, expressed and the recombinant...

Ngày tải lên: 30/03/2014, 08:20

... through the diffusion of F− ions and simultaneous effusion of the [TiF6 ]2− ions The faster rate of formation of TiO2 nanotubes using ultrasonic waves can be explained by the faster mobility of the ... magnetic stirring The saturation of current with time indicates the development of repassivation, the saturation of nanotube formation These results are in line with the findings of our FESEM studies ... into the nanotubular reaction channel and effusion of the [TiF6 ]2− ions from the channel It is well known that the cavitation effect of ultrasonication results in implosion of bubbles near the...

Ngày tải lên: 05/05/2014, 15:26

... These substances also control both towards the toxicants makes them the potential the reduction rate of metal ions and the materials for the decomposition applications agglomeration process of ... reaction of the 2-CEPS with CaO program for GC: The carrier gas was helium nanoparticles with a flow rate of mL.min-1 The initial and For this purpose, 10 μL of 2-CEPS, mL of final temperature of the ... remediation the reactions are analogous to their solution agent, adsorbent, etc [33-36] In the present behavior Recent investigations have explored work, the synthesis of CaO nanoparticles by the promising...

Ngày tải lên: 06/05/2014, 08:55

... investigated Herein, we report the further use of this facile, low-cost, green solgel-based hydrothermal method and an investigation of the dependence of the morphology evolution of the self-assembled flower-like ... concentration of OH is present in the aqueous medium Following the decrease in the concentration of Zn(OH)42 due to the initial fast nucleation of ZnO, the absorption of OH ions on the positively ... from the UV light and the test tube containing the KGL solution was rotated at a distance of 10 cm from the center of the lamp Samples were collected at intervals of 20 min, centrifuged, and the...

Ngày tải lên: 06/05/2014, 13:26

... Page of 13 Figure Effect of in vitro treatment of different doses of GnRH-Ag on progesterone synthesis and western blot analyses of LH-R and 3b-HSD proteins in the ovaries of mice Progesterone synthesis ... with LH, there is increase in progesterone synthesis This increase in progesterone synthesis is due to increase responsiveness of LH in the presence of GnRH-Ag Singh and Krishna Journal of Ovarian ... doses of GnRH-Ag together with LH significantly (P < 0.01) enhanced the expression of both ER-a and PR proteins in the ovaries Discussion The purpose of present study was to evaluate the effects of...

Ngày tải lên: 20/06/2014, 07:20

... The lack of knowledge regarding the ligninolytic property of these fungi is an impediment to the development of a highly effective lignin-degrading fungal strain for the construction of an efficient ... (Fig 3) In the case of addition of only W-7, the result was same as in the case of addition 12 of cAMP, IBMX and W-7 (data not shown), which was already reported by Sakamoto et al (2010) These results ... should also be further analyzed The diagram of cAMP and CaM pathways for the LiP and MnP expression has been updated based on the present results (Fig 6) Of course, there are many other regulating...

Ngày tải lên: 20/06/2014, 20:20

... furnish the pure oxime in 60-98% yield 90 Page of run might be due to the loss of active sites of the catalyst Conclusions To the best of our knowledge, Bi O has never been used in the synthesis of ... characterization of carbonyl compounds [1,2].Conversions into nitriles [3], nitro compounds [4,5], nitrones [6], amines [7], and synthesis of azaheterocycles [8] are some of the synthetic applications of oximes ... in a mortar with a pestle for the required period of time On completion of the reaction as Table Reusability of Bi2O3 in the preparation of 2b using 60 mol% of the catalyst Entry Run number Time...

Ngày tải lên: 20/06/2014, 22:20

... distribution The inset of (b) shows the Au nanoparticle The inset of (c) corresponds to the EDX analysis of the Si NWs shows the histogram plot for the diameter distribution of the synthesized Si ... the pores of the AAO mask and will be responsible for the constant dimensions of the synthesized nanowires Figure shows the surface of the AAO-Si substrate, once the Figure Diagram of the CVD system ... growth The Si used in the growth process of nanowires is obtained from thermally generated defects on the surface of Si (100) These defects can be observed subsequently to the synthesis of Si...

Ngày tải lên: 21/06/2014, 01:20

... A3 The SiN layer underwent a swelling of about nm, whereas the thickness of the underlying HfO and SiO layers remain almost the same as in the as-deposited sample In contrast, HREM image of sample ... In the images, the surface of SiN layer is indicated by a white line accumulation layer of the substrate), resulting in a shift of the C-V curve toward negative voltages [21,22] In general, the ... prepared the draft of the manuscript Moreover, AS and CB participated in the coordination of study All authors read and approved the final manuscript Competing interests The authors declare that they...

Ngày tải lên: 21/06/2014, 05:20

... should also be further analyzed The diagram of cAMP and CaM pathways for the LiP and MnP expression has been updated based on the present results (Figure 6) Of course, there are many other regulating ... Further study is required to determine whether the CaM has other functions including post-transcriptional effects on the expression of LiP and MnP Additionally, lipF regulation, transcription of ... significantly increased in the presence of mM cAMP and 100 μM IBMX compared to the no-supplement control (Figure 2) W-7, a CaM inhibitor that repressed the activity and the transcription of the all isozyme...

Ngày tải lên: 21/06/2014, 17:20

... variety of pharmaceutically important compounds Their efficient synthesis still poses a major challenge Transaminases (also known as aminotransferases) possess a great potential for the synthesis of ... 2002) The reaction starts with the deamination of aspartate to α-ketoglutarate In the resting enzyme PLP is covalently bound to the ε-amino group of a lysine (Lys258) in the active site of the ... of Lys258 then acts as a catalyst for the 1,3-prototropic shift to form the ketimine The ketimine is hydrolyzed to yield the keto acid and PMP The following second half reaction consists of the...

Ngày tải lên: 21/06/2014, 17:20

... should also be further analyzed The diagram of cAMP and CaM pathways for the LiP and MnP expression has been updated based on the present results (Figure 6) Of course, there are many other regulating ... Further study is required to determine whether the CaM has other functions including post-transcriptional effects on the expression of LiP and MnP Additionally, lipF regulation, transcription of ... significantly increased in the presence of mM cAMP and 100 μM IBMX compared to the no-supplement control (Figure 2) W-7, a CaM inhibitor that repressed the activity and the transcription of the all isozyme...

Ngày tải lên: 21/06/2014, 19:20

... study the influence of growth temperature on the purity of prepared tube samples, we give the curve (Fig 4) showing the dependence of ID/IG on the growth temperature From Fig 4, two kinds of ID/IG ... accords with the result of the TEM image (Fig 3a) The intensity ratio, ID/IG, is observed to decrease with increasing temperature (at 800 °C, the ID/IG is 0.47) Raman spectrum of the sample grown ... cm-1 (the fundamental E2g mode of graphite) are presented In the lower wavenumber region (100–300 cm-1), the radial breath modes (RBM) which represent the existence of SWCNTs are hardly shown The...

Ngày tải lên: 22/06/2014, 00:20