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    "count": 732,
    "next": "https://api.research.service.sci.tu.ac.th/api/normalPublication/?format=api&page=73",
    "previous": "https://api.research.service.sci.tu.ac.th/api/normalPublication/?format=api&page=71",
    "results": [
        {
            "id": 710,
            "title": "3,9-Dimethoxy-6a,11a-dihydro-6H-benzo[4,5]furo[3,2-c]chromene-4,10-diol monohydrate",
            "abstract": "In the title compound, also known as 4,10-dihydroxy-3,9- dimethoxypterocarpan monohydrate and melilotocarpan D monohydrate, C 17H16O6·H2O, and the tetrahydropyran ring adopts a distorted envelope conformation and tetrahydro-furan ring displays an envelope conformation. The chroman moiety and benzofuran ring system are inclined at an angle of 45.81 (5)°. The molecular structure is stabilized by O-H⋯O intramolecular interactions. In the crystal structure, the OH⋯O intermolecular hydrogen bonds link the molecules to form networks parallel to the ac plane; these are interconnected along the b axis by C-H⋯O interactions. © 2003 International Union of Crystallography Printed in Great Britain - all rights reserved.",
            "published_year": 2003,
            "file": null,
            "authors": [
                "Aree T.",
                "Tip-pyang S.",
                "Chaichit N.",
                "Paramapojn S."
            ],
            "keywords": [],
            "references": [
                "Sheldrick, G.M., (1997) SHELXS97 and SHELXL97, , University of Göttingen, Germany",
                "Cremer, D., Pople, J.A., (1975) J. Am. Chem. Soc., 97, pp. 1354-1358",
                "Burnett, M.N., Johnson, C.K., (1996) ORTEPIII, , Oak Ridge National Laboratory, Tennessee, USA",
                "Dewick, P.M., (1994) The Flavonoids: Advances in Research since 1986, pp. 226-238. , edited by J. B. Harborne, London: Chapman and Hall",
                "Sheldrick, G.M., (1996) SADABS. Version 4.202, , University of Göttingen, Germany",
                "Spek, A.L., (1990) Acta Cryst., A46, pp. C-34",
                "(1996) SMART (Version 4.0), SAINT (Version 4.0) and SHELXTL (Version 5.0), , Siemens Analytical X-ray Instruments Inc., Madison, Wisconsin, USA",
                "Pietta, P.-G., (2000) J. Nat. Prod., 63, pp. 1035-1042"
            ]
        },
        {
            "id": 712,
            "title": "Crystal structure of β-cyclodextrin-benzoic acid inclusion complex",
            "abstract": "The inclusion complex of β-cyclodextrin (β-CD) with benzoic acid (BA) has been characterized crystallographically. Two β-CDs cocrystallize with two BAs, 0.7 ethanol and 20.65 water molecules [2(C6H10O5)7·2(C 7H6O2)·0.7(C2H 6O)·20.65H2O] in the triclinic space group P1 with unit cell constants: a=15.210(1), b=15.678(1), c=15.687(1) Å, α=89.13(1), β=74.64(1), γ=76.40(1)°. The anisotropic refinement of 1840 atomic parameters against 16,201 X-ray diffraction data converged at R=0.078. In the crystal lattice, β-CD forms dimers stabilized by direct O-2(m)_1/O-3(m)_1⋯ O-2(n)_2/O-3(n)_2 hydrogen bonds (intradimer) and by indirect O-6(m)_1⋯O-6(n)_2 hydrogen bonds with one or two bridging water molecules joined in between (interdimer). These dimers are stacked like coins in a roll constructing endless channels where the guest molecules are included. The BA molecules protrude with their COOH groups at the β-CD O-6-sides and are maintained in positions by hydrogen bonding to the surrounding O-6-H groups and water molecules. Water molecules (20.65) are distributed over 30 positions in the interstices between β-CD molecules, except the water sites W-1, W-2 that are located in the channel of the β-CD dimer. Water site W-2 is hydrogen bonded to the disordered ethanol molecule (occupancy 0.7). © 2003 Elsevier Science Ltd. All rights reserved.",
            "published_year": 2003,
            "file": null,
            "authors": [
                "Aree T.",
                "Chaichit N."
            ],
            "keywords": [
                "hydrogen bond",
                "crystal structures",
                "benzoic acid inclusion complexes",
                "β-cyclodextrin",
                "x-ray analysis"
            ],
            "references": [
                "Brett, T.J., Alexander, J.M., Stezowski, J.J., (2000) J. Chem. Soc., Perkin Trans. 2, pp. 1105-1111",
                "Sheldrick, G.M., Schneider, T.R., (1997) Methods Enzymol., 277, pp. 319-343",
                "Huang, M.-J., Watts, J.D., Bodor, N., (1997) Int. J. Quant. Chem., 65, pp. 1135-1152",
                "Bergeron, R.J., Channing, M.A., Gibeily, G.J., Pillor, D.M., (1977) J. Am. Chem. Soc., 99, pp. 5146-5151",
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                "Saenger, W., (1980) Angew. Chem., Int. Ed. Engl., 19, pp. 344-362",
                "Sheldrick, G.M., (1996) SADABS, Program for Empirical Absorption correction of Area Detector Data, , University of Göttingen: Germany",
                "Rontoyianni, A., Mavridis, I.M., (1994) J. Inclu. Phenom. Macrocycl. Chem., 18, pp. 211-227",
                "Salvatierra, D., Jaime, C., Virgili, A., Sanchez-Ferrando, F., (1996) J. Org. Chem., 61, pp. 9578-9581",
                "Cremer, D., Pople, J.A., (1975) J. Am. Chem. Soc., 97, pp. 1354-1358",
                "Szejtli, J., (1982) Cyclodextrins and Their Inclusion Complexes, , Budapest: Akademiai Kiado",
                "Nishioka, F., Nakanishi, I., Fujiwara, T., Tomita, K., (1984) J. Inclu. Phenom. Macrocycl. Chem., 2, pp. 701-711",
                "Saenger, W., (1985) Isr. J. Chem., 25, pp. 43-50",
                "Egert, E., Sheldrick, G.M., (1985) Acta Crystallogr., Sect. A, 41, pp. 262-268",
                "Hori, K., Hamai, S., (1999) J. Inclu. Phenom. Macrocycl. Chem., 34, pp. 245-252",
                "(1996) Siemens, SHELXTL, Version 5.0, , Siemens Analytical X-ray Instruments Inc., Madison, WI: USA",
                "Hendrickson, K., Easton, C.J., Lincoln, S.F., (1995) Aust. J. Chem., 48, pp. 1125-1132",
                "Burnett, M.N., Johnson, C.K., (1996) ORTEP-III, Thermal-Ellipsoid Plot Program for Crystal Structure Illustrations, , Oak Ridge Natl. Lab., Tennessee: USA",
                "Duchêne, D., (1987) Cyclodextrins and Their Industrial Uses, , Editions de Sante Paris",
                "Kraulis, P.J., (1991) J. Appl. Crystallogr., 24, pp. 946-950",
                "McRee, D.E., (1993) Practical Protein Crystallography, , San Diego: Academic Press Inc",
                "Makedonopoulou, S., Mavridis, I.M., (2000) Acta Crystallogr., Sect. B, 56, pp. 322-331",
                "Harata, K., (1998) Chem. Rev., 98, pp. 1803-1828"
            ]
        },
        {
            "id": 713,
            "title": "Synthesis, crystal structures and magnetism of planar and roof-shaped hydroxo-bridged dinuclear copper(II) compounds with di-2-pyridylamine as a ligand",
            "abstract": "The compounds [Cu(dpyam)(OH)Br]2(H2O)4 (1), [Cu(dpyam)(OH)(CF3SO3)]2 (2) and [Cu2(dpyam)2(OH)2(OH2)]Br 2(H2O)2 (3) have been synthesized and their crystal structures determined by X-ray crystallographic methods. Compound 1 crystallises in the triclinic system, space group P1̄. The lattice constants are a=8.892(1), b=9.346(1), c=9.358(1) Å, α=112.2(1), β=108.3(1), γ=95.8(2)° with Z=1 and R1=0.0292. Compound 2 crystallises in the triclinic system, space group P1̄. The lattice constants are a=8.1616(5), b=9.4156(6), c=10.2921(6) Å, α=72.58(2), β=72.48(4), γ=73.19(2)° with Z=1 and R1=0.0595. Crystals of 3 are orthorhombic with space group Cmc21. The lattice constants are a=15.979(1), b=8.550(1), c=18.237(1) Å with Z=4 and R=0.0623. Compound 1 contains a dinuclear [Br(dpyam)Cu(OH)2Cu(dpyam)Br] unit with a dihedral angle between the CuO2 planes of 179.9°. Each copper atom is in a square-pyramidal coordination environment; the basal plane consists of two bridging hydroxo groups and two dpyam ligands coordinated through their nitrogen atom. The fifth axial coordination site of each copper(II) ion is occupied by a Br atom, at a weak semi-coordination distance of 2.803(2) and 2.804(2) Å. For compound 2, the coordination geometry around each copper(II) ion is distorted elongated octahedral, CuN2O4. The equatorial positions are occupied by the two nitrogen atoms of dpyam and the two oxygen atoms of the bridging hydroxo groups, where the apical positions are occupied by oxygen atoms from both triflate groups. In the dinuclear units of compound 3 the triply-bridged Cu(II) ions show a distorted square pyramidal coordination. The fifth apical ligand is a longer bonded bridging water molecule for 3, at distances of 2.220(2) Å, which joins the basal CuN2O2 planes in a roof-shaped configuration (dihedral angle 135.8o). The Cu-Cu distances are 2.993(2), 2.964(2) and 2.849(2) Å for compounds 1, 2 and 3, respectively. The magnetic susceptibility measurements revealed a ferromagnetic interaction between the Cu(II) atoms for compound 2, with a singlet-triplet energy gap (J) around 83 cm-1. Compound 1 has an antiferromagnetic interaction with a J of -48.6 cm-1, whereas compound 3 is very weakly antiferromagnetic with J=-0.6 cm-1. © 2002 Elsevier Science B.V. All rights reserved.",
            "published_year": 2003,
            "file": null,
            "authors": [
                "Pakawatchai C.",
                "Roubeau O.",
                "Youngme S.",
                "Chaichit N.",
                "Reedijk J.",
                "Van Albada G.A."
            ],
            "keywords": [
                "copper(ii)",
                "magnetism",
                "hydroxo-bridged",
                "x-ray structures",
                "roof-shaped"
            ],
            "references": [
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                "Albada G.A.van, Smeets, W.J.J., Spek, A.L., Reedijk, J., (1997) Inorg. Chim. Acta, 260, p. 151",
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                "Youngme, S., Chaichit, N., Unpublished results",
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            ]
        },
        {
            "id": 714,
            "title": "Separation and determination of vanadium in fertiliser by capillary electrophoresis with a light-emitting diode detector",
            "abstract": "A method has been developed for determination of vanadium, as an anionic ternary complex of vanadium(V) with 4-(2-pyridylazo) resorcinol (PAR) and hydrogen peroxide, after separation by capillary electrophoresis (CE). The optimum conditions for the formation of the ternary complex were acetate buffer (3 mmol L-1) at pH 6 containing 0.15 mmol L-1 PAR and 7.1 mmol L-1 H2O2. The CE separation was conducted using 15 mmol L-1 acetate buffer at pH 6 as the background electrolyte; the separation potential was -30 kV and the injection time 100s. The vanadium complex was detected photometrically at 568 nm, by use of a light-emitting diode (LED); the detection limit was 19 ppb. The method was applied to the analysis of vanadium in fertilisers. Clean-up of the digested fertiliser sample, with Sep-Pak C18 coated with tetrabutylammonium hydroxide, before analysis was used to remove matrix ions which otherwise caused electrophoretic de-stacking. Vanadium levels found in the fertiliser samples by use of the CE method were found to be comparable with results obtained by HPLC and ICP-MS.",
            "published_year": 2002,
            "file": null,
            "authors": [
                "Vachirapatama N.",
                "Haddad P.R.",
                "Macka M."
            ],
            "keywords": [
                "ternary complexes",
                "fertiliser",
                "capillary electrophoresis",
                "vanadium"
            ],
            "references": [
                "Wang, Y., Dubin, P.L., (1999) Anal Chem, 71, pp. 3463-3468",
                "Wuilloud, R.G., Salonia, J.A., Gasquez, J.A., Olsina, R.A., Martinez, L.D., (2000) Anal Chim Acta, 420, pp. 73-79",
                "Vachirapatama, N., Jirakiattikul, Y., Dicinoski, G.W., Townsend, A.T., Haddad, P.R., (2002), Manuscript in preparation",
                "Vachirapatama, N., Dicinoski, G.W., Townsend, A.T., Haddad, P.R., (2002) J Chromatogr A, 956, pp. 221-227",
                "Liu, B.F., Liu, L.B., Chen, H., Cheng, J.K., (2001) Fresenius J Anal Chem, 369, pp. 195-197",
                "Breadmore, M.C., Haddad, P.R., Fritz, J.S.E., (2001) Electrophoresis, 20, pp. 3181-3190",
                "Adachi, A., Sawada, S., Shida, K., Nakamura, E., Okano, T., (1999) Anal Lett, 32, pp. 2327-2334",
                "Townsend, A.T., (2000) J Anal At Spectrom, 15, pp. 307-314",
                "Frank, A., Madej, A., Galgan, V., Petersson, L.R., (1996) Sci Total Environ, 181, pp. 73-92"
            ]
        },
        {
            "id": 715,
            "title": "Associations of particulate matter and daily mortality in Bangkok, Thailand",
            "abstract": "The association between airborne particles and daily mortality has been reported in many locations, but mainly in western countries. There is a need to investigate the association in locations where the emission sources, weather, and other environmental conditions differ from those in western countries. In this study, the acute effects of PM10 and visibility on daily mortality in Bangkok, Thailand, from 1992 to 1997, were examined. A Poisson regression model was developed to estimate the excess daily mortality associated with PM10 and visibility, while controlling for long-term trends, season, and variations in weather. It was found that increasing PM10 and decreasing visibility levels were independently associated with increasing daily mortality from all non-external causes, cardiovascular, respiratory, and other diseases. The observed associations were stronger for respiratory diseases than for cardiovascular and other diseases and were stronger for persons aged ≥65 years than for those in the younger age group. The results of the PM10/mortality and visibility/mortality models were consistent, suggesting that visibility may be considered as a surrogate marker for the assessment of the adverse health effects of fine particulate matter when data from direct gravimetric measurements are not available.",
            "published_year": 2002,
            "file": null,
            "authors": [
                "Vajanapoom N.",
                "Loomis D.",
                "Neas L.M.",
                "Shy C.M."
            ],
            "keywords": [],
            "references": [
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                "Schwartz, J., Particulate air pollution and daily mortality in Detroit (1991) Environ Res, 56, pp. 204-213",
                "Schwartz, J., Dockery, D.W., Neas, L.M., Is daily mortality specifically with fine particles? (1996) Air Waste Manag Assoc, 46, pp. 927-939",
                "Delfino, R.J., Becklake, M.R., Hanley, J.A., The relationship of urgent hospital admissions for respiratory illness to photochemical air pollution levels in Montreal (1994) Environ Res, 67, pp. 1-19",
                "Vajanapoom, N., Shy, M.C., Neas, M.L., Loomis, D., Estimation of particulate matter (PM10) from visibility in Bangkok, Thailand (2001) J Expos Anal Environ Epidemiol, 11, pp. 97-102",
                "Katsouyanni, K., Schwartz, J., Spix, C., Short term effects of air pollution on health: A European approach using epidemiologic time series data: the APHEA protocol (1996) J Epidemiol Comm Health, 50 (1 SUPPL.), pp. S12-8",
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                "Pope III, C.A., Schwartz, J., Ransom, M., Daily mortality and PM10 pollution in Utah Valley (1992) Arch Environ Health, 42, pp. 211-217",
                "Hastie, T.J., Tibshirani, R.J., (1990) Generalized Additive Models, , New York: Chapman and Hall",
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                "Ostro, B., Chestnut, L., Vichit-Vadakan, N., Laixuthai, A., The impact of particulate matter on daily mortality in Bangkok, Thailand (1999) J Air Waste Manag Assoc, 49, pp. 100-107",
                "Fairley, D., The relationship of daily mortality to suspended particulates in Santa Clara County, 1980-1986 (1990) Environ Health Perspect, 89, pp. 159-168",
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                "Vol III. Terrestrial, Materials, Health and Bisibility Effects, 3. , Irving PM, ed. The US National Acid Precipitation Assessment Program",
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                "Borja-Aburto, V.H., Loomis, D.P., Bangdiwala, S.I., Shy, C.M., Rascon-Pacheco RA. Ozone, suspended particulates, and daily mortality in Mexico City (1997) Am J Epidemiol, 145, pp. 258-268",
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                "Schwartz, J., Dockery, D.W., Particulate air pollution and daily mortality in Steubenville, Ohio (1992) Am J Epidemiol, 135, pp. 12-19",
                "Verhoeff, A.P., Hoek, G., Schwartz, J., Van Wijnen, J.H., Air pollution and daily mortality in Amsterdam (1996) Epidemiology, 7, pp. 225-230"
            ]
        },
        {
            "id": 716,
            "title": "Hydrogen bonding in labdane diterpenoids, labda-7,12(E),14-triene-17-oic acid and labda- 12(Z),14,17-triene-18-oic acid",
            "abstract": "Two labdane diterpenoids, labda-7,12(E), 14-triene-17-oic acid (1) and labda-12(Z), 14, 17-triene-18-oic acid (2), C20H30O 2, have been isolated from Croton oblongifolius. Both 1 and 2 crystallized in the monoclinic system, space group C2, with cell dimensions of a = 21.912(1) Å, b = 7.4002(4) Å, c = 11.5079(7) Å, β = 101.999(1)° and a = 21.308(2) Å, b = 11.9067(9) Å, c = 7.5606(6) Å, β = 100.763(1)°, respectively. Compound 1, a rare example of carboxylic group bound to a cyclohexene ring, forms an infinite intermolecular hydrogen-bonded polymer [O1 ⋯ O2(-x + 1/2, y + 1/2, -z + 2) 2.697(2) Å], whereas molecules of compound 2 are linked to form an asymmetric hydrogen-bonded dimer [O1 ⋯ O2(-x, y,-z) 2.657(3) Å].",
            "published_year": 2002,
            "file": null,
            "authors": [
                "Petsom A.",
                "Chaichantipyuth C.",
                "Jaiboon N.",
                "Roegsumran S.",
                "Chaichit N.",
                "Sommit D.",
                "Pattamadilok D."
            ],
            "keywords": [
                "crystal structure",
                "hydrogen bonding",
                "labdane diterpenoid",
                "croton oblongifolius"
            ],
            "references": [
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                "Roengsumran, S., Petsom, A., Sommit, D., Vilaivan, T., (1999) Phytochemistry, 50, pp. 449-453",
                "Roengsumran, S., Petsom, A., Kuptiyanuwat, N., Vilaivan, T., Ngamrojnavanich, N., Chaichantipyuth, C., Phuthong, S., (2001) Phytochemistry, 56, pp. 103-107",
                "Pattamadilok, D., (1998), M. Sc. Thesis in Pharmacy, Chulalongkorn University, Bangkok, Thailand",
                "Lee, G.H., Lin, C., Cheng, Y.S., Peng, S.M., (1987) Acta Crystallogr., Sect. C, 43, pp. 1382-1384",
                "Sheldrick, G.M., (1997) SHELXL-97, , University of Göttingen: Germany"
            ]
        },
        {
            "id": 717,
            "title": "Crystal structure of β-cyclodextrin-dimethylsulfoxide inclusion complex",
            "abstract": "β-Cyclodextrin (β-CD) crystallizes from 27% DMSO-water as β-CD·0.5DMSO·7.35H2O in the monoclinic space group P21 with unit cell constants: a=15.155(1), b=10.285(1), c=20.906(1) Å, β=109.86(1)°. Anisotropic refinement of 888 atomic parameters against 9,127 X-ray diffraction data converged at an R-factor of 0.055. The β-CD macrocycle adopts a 'round' conformation stabilized by intramolecular, interglucose O-3(n)⋯O-2(n+1) hydrogen bonds. In the β-CD cavity, DMSO, water sites W-1, W-3 (occupancies 0.5, 0.25, 0.75) are not located concurrently with the water site W-2 because the interatomic distances to W-2 are too short (1.56-1.75 Å). DMSO is placed in the β-CD cavity such that its S-atom is shifted from the O-4 plane center to the β-CD O-6-side ca. 0.9 Å and the C-S bond which is inclined 13.6° to the β-CD molecular axis. It is maintained in position by hydrogen bonding to water site W-3 and the O-31-H group. 7.35 water molecules are extensively disordered in 13 positions both inside (W-1-W-4) and outside (W-5-W-13) the β-CD cavity. They act as hydrogen bonding mediators contributing significantly to the stability of the crystal structure. © 2002 Elsevier Science Ltd. All rights reserved.",
            "published_year": 2002,
            "file": null,
            "authors": [
                "Aree T.",
                "Chaichit N."
            ],
            "keywords": [
                "hydrogen bond",
                "crystal structure",
                "dimethylsulfoxide inclusion complex",
                "β-cyclodextrin",
                "x-ray analysis"
            ],
            "references": [
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            ]
        },
        {
            "id": 718,
            "title": "Determination of vanadium as 4-(2-pyridylazo)resorcinol-hydrogen peroxide ternary complexes by ion-interaction reversed-phase liquid chromatography",
            "abstract": "The separation and determination of the vanadium(V) ternary complex formed with 4-(2-pyridylazo)resorcinol (PAR) and hydrogen peroxide using ion-interaction reversed-phase high-performance liquid chromatography on a C18 column has been investigated. The optimal mobile phase was a methanol-water solution (32:68, v/v) containing 3 mM tetrabutylammonium bromide, 5 mM acetic acid and 5 mM citrate buffer at pH 7, with absorbance detection at 540 nm. The stoichiometry of the ternary complex of vanadium at pH 6 in 10 mM acetate buffer using the mole ratio and Job's method by HPLC indicated that the mole ratio of V(V):PAR:H2O2 was 1:1:1. The optimal conditions for precolumn formation of the ternary complex were 10 mM acetate, 7 mM H2O2, 0.3 mM PAR, and pH 6. The method gave relative standard deviations of retention time, peak area and peak height for the ternary complex of 0.187, 0.45 and 0.57%, respectively. The detection limit (at a signal-to-noise ratio of 3) for V(V) was 0.09 ng/ml in the digested sample using a 100-μl injection loop (or 0.09 μg/g in the solid fertiliser sample). The method was applied to the analysis of fertilisers (phosphate rocks and nitrogen, phosphorus and potassium fertiliser). The results for vanadium obtained by the HPLC method agreed well with those from magnetic sector inductively coupled plasma MS analysis. © 2002 Elsevier Science B.V. All rights reserved.",
            "published_year": 2002,
            "file": null,
            "authors": [
                "Dicinoski G.W.",
                "Vachirapatama N.",
                "Haddad P.R.",
                "Townsend A.T."
            ],
            "keywords": [
                "metal cations",
                "pyridylazoresorcinol",
                "complexation",
                "fertilisers",
                "hydrogen peroxide",
                "vanadium"
            ],
            "references": [
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            ]
        },
        {
            "id": 719,
            "title": "Croblongifolin, a new anticancer clerodane from Croton oblongifolius",
            "abstract": "A new furoclerodane, croblongifolin, together with one known clerodane, crovatin and one known labdane, nidorellol, were isolated from the stem bark of Croton oblongifolius. Structures were established based on spectroscopic and X-ray analysis. Croblongifolin showed a significant cytotoxicity against various human tumor cell lines including HEP-G2, SW620, CHAGO, KATO3 and BT474.",
            "published_year": 2002,
            "file": null,
            "authors": [
                "Vilaivan T.",
                "Jaiboon N.",
                "Sangvanich P.",
                "Chaichit N.",
                "Petsom A.",
                "Chaichantipyuth C.",
                "Puthong S.",
                "Roengsumran S.",
                "Pornpakakul S.",
                "Musikul K."
            ],
            "keywords": [],
            "references": [
                "Moulis, C., Bon, M., Jaud, J., Fourasre, I., Crovatin, a furanoid diterpene from Croton levatii (1992) Phytochemistry, 31, pp. 1421-1423",
                "Roengsumran, S., Petsom, A., Sommit, D., Vilaivan, T., Labdane diterpenoids from Croton oblongifolius (1999) Phytochemistry, 50, pp. 449-453",
                "Bohlmann, F., Fritz, U., Neue diterpene und acetylenyerbindungen aus nidorella-arten (1978) Phytochemistry, 17, pp. 1769-1772",
                "Roengsumran, S., Singtothong, P., Pudhom, K., Ngamrochanavanich, N., Petsom, A., Chaichantipyuth, C., Neocrotocembranal from Croton oblongifolius (1999) Journal of Natural Products, 62, pp. 1163-1164",
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                "Piozzi, F., Rodriguez, B., Savona, G., Advance in the chemistry of the furanoditerpeneoids from Teucrium species (1987) Heterocycles, 25, p. 41",
                "Roengsumran, S., Petsom, A., Kuptiyanuwat, N., Vilaivan, T., Ngamrochanavanich, N., Chaichantipyuth, C., Singtothong, P., Cytotoxic labdane diterpenoids from Croton oblongifolius (2001) Phytochemistry, 56, pp. 103-107",
                "Asakawa, Y., Toyota, M., Takemoto, T., New diterpenes from Porella perrottetiana (1979) Phytochemistry, 18, pp. 1681-1685",
                "Roengsumran, S., Achayindee, S., Petsom, A., Pudhom, K., Singtothong, P., Surachetapan, C., Vilaivan, T., Two new cembranoids from Croton oblongifolius (1998) Journal of Natural Products, 61, pp. 652-654"
            ]
        },
        {
            "id": 720,
            "title": "Voice articulator for Thai speaker recognition system",
            "abstract": "Standard speaker recognition system employs a preprocessed form of an acoustic signal, which provides information about a distribution of signal energy across time and frequency. However, different signal representations may be employed, either as genuine alternatives to the acoustic representation, or as additional sources of information. Voice articulator encourages a viability and a potential of the speech signal representation especially in a Thai speaker recognition system. Applying the biometrical voice articulator additionally with a Backpropagation multilayered perceptron attains a marvellous recognition accuracy. LPC and MFCC with several coefficient orders have been performed comparatively. The highest percentage of recognition accuracy with an efficient computational time is 97.24% belonging to the Bilabial articulator from the 16th coefficient order of MFCC. © 2002 Nanyang Technological University.",
            "published_year": 2002,
            "file": null,
            "authors": [
                "Limpanakorn S.",
                "Tanprasert C."
            ],
            "keywords": [],
            "references": [
                "Tanprasert, C., Comparative Study of GMM, DTW, and ANN on Thai Speaker Identification System Proceedings of 6th International Conference on Spoken Language Processing (2000), pp. 234-237",
                "Fry, D.B., (1979) The Physics of Speech, , Cambridge University Press",
                "Fu, L.M., (1994) Neural Networks in Computer Intelligence, , Singapore : McGraw-Hill",
                "Furui, S., Recent Advances in Speaker Recognition (1997) Audio and Video Based Biometrics Person Authentication",
                "Naksakun, K., Thai Sound System, p. 2541. , Chulalongkorn University",
                "Rabiner, L., Juang, B.H., (1993) Fundamentals of Speech Recognition, , New Jersey : Prentice-Hall International"
            ]
        }
    ]
}