1,721,400 research outputs found
A catalogue and systematic overview of the shield-tailed snakes (Serpentes: Uropeltidae)
No full textPyron, Robert Alexander, Ganesh, Sumaithangi Rajagopalan, Sayyed, Amit, Sharma, Vivek, Wallach, Van, Somaweera, Ruchira (2016): A catalogue and systematic overview of the shield-tailed snakes (Serpentes: Uropeltidae). Zoosystema 38 (4): 453-506, DOI: 10.5252/z2016n4a2, URL: http://dx.doi.org/10.5252/z2016n4a
A review of records of the Trimeresurus albolabris Gray, 1842 group from the Indian subcontinent: expanded description and range extension of Trimeresurus salazar, redescription of Trimeresurus septentrionalis and rediscovery of historical specimens of Trimeresurus davidi (Reptilia: Viperidae)
No full textVogel, Gernot, Mallik, Ashok Kumar, Chandramouli, S. R., Sharma, Vivek, Ganesh, S. R. (2022): A review of records of the Trimeresurus albolabris Gray, 1842 group from the Indian subcontinent: expanded description and range extension of Trimeresurus salazar, redescription of Trimeresurus septentrionalis and rediscovery of historical specimens of Trimeresurus davidi (Reptilia: Viperidae). Zootaxa 5175 (3): 343-366, DOI: https://doi.org/10.11646/zootaxa.5175.3.
FIG. 9 in A catalogue and systematic overview of the shield-tailed snakes (Serpentes: Uropeltidae)
No full textFIG. 9. — Some uropeltid species photographed in life: A, Uropeltis madurensis (Beddome, 1878); B, U. phipsonii (Mason, 1888); C, U. pulneyensis (Beddome, 1863); D, U. shorttii (Beddome, 1863). Photos by SRG and S. Ramchandran.Published as part of Pyron, Robert Alexander, Ganesh, Sumaithangi Rajagopalan, Sayyed, Amit, Sharma, Vivek, Wallach, Van & Somaweera, Ruchira, 2016, A catalogue and systematic overview of the shield-tailed snakes (Serpentes: Uropeltidae), pp. 453-506 in Zoosystema 38 (4) on page 495, DOI: 10.5252/z2016n4a2, http://zenodo.org/record/457834
Biocatalytic route to C-3?-azido/-hydroxy-C-4?-spiro-oxetanoribonucleosides
Full text linkThe lipase, Novozyme®-435, exclusively deacetylates the 5-O-acetyl over 4-C-acetyloxymethyl group of almost identical reactivity in 5-O-acetyl-4-C-acetyloxymethyl-3-azido-3-deoxy-1,2-O-isopropylidene-?-D-ribofuranose that led to the development of first and efficient synthesis of 3?-azido-/3?-amino-C-4?-spiro-oxetanoribonucleosides T, U, C and A in 20–24% overall yields. The X-ray study on the compound obtained by tosylation of lipase-mediated monodeacetylated product unambiguously confirmed the point of diastereoselective monodeacetylation on diacetoxy-azido-ribofuranose derivative. The capability of Novozyme®-435 for selective deacylation of 5-O-acetyl group in 5-O-acetyl-4-C-acetyloxymethyl-3-O-benzyl-1,2-O-isopropylidene-?-D-ribofuranose recently discovered by us has been successfully used for the synthesis of C-4?-spiro-oxetanoribonucleosides A and C in good yields. These results clearly indicate that the broader substrate specificity and highly selective capability of Novozyme®-435 for carrying out acetylation/deacetylation reactions can be utilized for the development of environment friendly selective methodologies in organic synthesis
Electrocatalytic determination of thiols using hybrid Copper Cobalt Hexacyanoferrate modified glassy carbon electrode
No full textAn electrochemical sensor based on a glassy carbon electrode (GCE) modified by a thin film of hybrid copper cobalt hexacyanoferrate (Cu-CoHCF) was prepared and tested for the determination of three thiols: l-cysteine (CySH), l-glutathione (GSH) and 1,4-butanedithiol (BdSH). Cyclic voltammetry (CV) measurements were carried out with the as prepared and thermally treated chemically modified electrode (CME) in phosphate buffer solution from pH 2 to 7. From the CV measurements, it was concluded that at pH higher than 5, the Cu-CoHCF layer was unstable and underwent significant fouling when biased at a potential at which the three thiols were electrocatalically oxidized. Following the preliminary CVs chronoamperometric measurements were carried out to determine the optimum conditions to develop an analytical method for the determination of thiols. Cysteine showed the lowest limit of detection (7.5 × 10-7 M), but very low values were displayed also by GSH (2.5 × 10-6 M) and BdSH (2.0 × 10-6 M). The range of linearity extended up to 6.0 × 10-5 M for CySH, 9.0 × 10-5 M for GSH and 1.2 × 10-4 M for BdSH without significant fouling of the CME. The analytical method was applied to the determination of GSH in a nutraceutical purchased from the local market. © 2015 Elsevier B.V. All rights reserved
An intriguing empirical rule for computing the first normal stress difference from steady shear viscosity data for concentrated polymer solutions and melts
No full textThe Cox–Merz rule and Laun’s rule are two empirical relations that allow the estimation of steady shear viscosity and first normal stress difference, respectively, using small amplitude oscillatory shear measurements. The validity of the Cox–Merz rule and Laun’s rule imply an agreement between the linear viscoelastic response measured in small amplitude oscillatory shear and the nonlinear response measured in steady shear flow measurements. We show that by using a lesser-known relationship also proposed by Cox and Merz, in conjunction with Laun’s rule, a relationship between the rate-dependent steady shear viscosity and the first normal stress difference can be deduced. The new empirical relation enables a priori estimation of the first normal stress difference using only the steady flow curve (i.e., viscosity vs shear rate data). Comparison of the estimated first normal stress difference with the measured values for six different polymer solutions and melts show that the empirical rule provides values that are in reasonable agreement with measurements over a wide range of shear rates, thus deepening the intriguing connection between linear and nonlinear viscoelastic response of entangled polymeric materials.Akzo Nobel (Firm
FIG. 7 in A catalogue and systematic overview of the shield-tailed snakes (Serpentes: Uropeltidae)
No full textFIG. 7. — Some uropeltid species photographed in life: A, Rhinophis homolepis Hemprich, 1820; B, R. melanogaster (Gray, 1858); C, R. oxyrhynchus (Schneider, 1801); D, R. philippinus (Cuvier, 1829); E, R. phillipsi (Nicholls, 1929) n. comb.; F, R. punctatus Müller, 1832; G, R. saffragamus (Kelaart, 1853) n. comb.; H, R. sanguineus Beddome, 1863. Photos by RAP, RS, SRG, VS, A. Dey, R. Pethiyagoda, and S. Kehimkar.Published as part of Pyron, Robert Alexander, Ganesh, Sumaithangi Rajagopalan, Sayyed, Amit, Sharma, Vivek, Wallach, Van & Somaweera, Ruchira, 2016, A catalogue and systematic overview of the shield-tailed snakes (Serpentes: Uropeltidae), pp. 453-506 in Zoosystema 38 (4) on page 483, DOI: 10.5252/z2016n4a2, http://zenodo.org/record/457834
FIG. 8 in A catalogue and systematic overview of the shield-tailed snakes (Serpentes: Uropeltidae)
No full textFIG. 8. — Some uropeltid species photographed in life: A, Rhinophis zigzag Gower & Maduwage, 2011; B, Teretrurus sanguineus (Beddome, 1867); C, Uropeltis bicatenata (Günther, 1864); D, U. ceylanica Cuvier, 1829; E, U. dindigalensis (Beddome, 1877); F, U. ellioti (Gray, 1858); G, U. liura (Günther, 1875); H, U. macrolepis (Peters, 1861). Photos by RAP, RS, SRG, VS, S. Kehimkar, A. Mohan, and D. Raju.Published as part of Pyron, Robert Alexander, Ganesh, Sumaithangi Rajagopalan, Sayyed, Amit, Sharma, Vivek, Wallach, Van & Somaweera, Ruchira, 2016, A catalogue and systematic overview of the shield-tailed snakes (Serpentes: Uropeltidae), pp. 453-506 in Zoosystema 38 (4) on page 487, DOI: 10.5252/z2016n4a2, http://zenodo.org/record/457834
Extensibility-Enriched Spinnability and Enhanced Sorption and Strength of Centrifugally Spun Polystyrene Fiber Mats
No full textThe authors (J.M. and N. K.R.) acknowledge the IMOIMOMEC at the University of Hasselt for providing financial support. V.S. acknowledges funds from the 3M nontenured faculty award (NFTA). The authors also acknowledge discussions with students from the ODES lab at the UIC, especially Carina Martinez and Cheryl Slykas. The authors thank Dr. Samanvaya Srivasatava (UCLA) and Dr. Amanda Marciel (Rice) for their comments on the draft
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