701
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Abstract
A series of potential bioactive compounds, 1-glucosyl-4-heterocyclyl-5-(p-substituted-phenyl)-1,2,3-triazoles , were synthesized. Highly stereoselective products were obtained in good yield. Primary activity screening showed that this type of N-glucosylic compound possessed antitumour and antiviral activities.
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702
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Xiong Y, He XF, Zou XH, Wu JZ, Chen XM, Ji LN, Li RH, Zhou JY, Yu KB. Interaction of polypyridyl ruthenium(II) complexes containing non-planar ligands with DNA. ACTA ACUST UNITED AC 1999. [DOI: 10.1039/a806170j] [Citation(s) in RCA: 161] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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703
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704
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Tong ML, Zheng SL, Chen XM. Two- and three-dimensional non-interpenetrating open-networks self- assembled by μ4-hexamethylenetetramine (hmt). Syntheses and structures of [Ag2(μ4-hmt)(SO4)(H2O)]·4H2O and [Ag2(μ4-hmt)(μ-O2CMe)]MeCO2·4.5H2O. Chem Commun (Camb) 1999. [DOI: 10.1039/a900508k] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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705
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Tong ML, Lee HK, Chen XM, Huang RB, Mak TCW. A novel three-dimensional triangular organic–inorganic hybrid network self-assembled by mononuclear [Mn(4,4′-bipyridine)2(H2O)4]2+ cations and rich solvate 4,4′-bipyridine molecules through hydrogen-bonding and π–π interactions †. ACTA ACUST UNITED AC 1999. [DOI: 10.1039/a907111c] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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706
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Zhu HL, Tong YX, Zhao J, Chen XM, Duan CY, Tang WX. Synthesis, Crystal Structure and Characterization of [Bis { N,N′ -bis(2-aminoethyl) propane-1,3-diamine} (µ- imidazolato-N,N′)dizinc(II)] Triperchlorate. Aust J Chem 1999. [DOI: 10.1071/ch99025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The title compound
[Zn2(2,3,2-tet)2(Im)]
(ClO4)3
(C17H43Cl3N10O12Zn2,
2,3,2-tet =
N,N′-bis(2-
aminoethyl)propane-1,3-diamine, Im = imidazolate anion) consists of an
imidazolate-N,N′-bridged
binuclear cation and three perchlorate anions. The complex crystallizes in the
monoclinic space group C 2 with a
12 . 038(8), b 12 . 245(8),
c 11 . 902(3) Å, β
108 . 00(5)°, V 1668 . 6(15)
Å3 . The coordination geometry at each zinc(II)
centre is approximately square-pyramidal. The Zn . . . Zn
separation is 6 . 114(9) Å. Cyclic voltammetry shows two
irreversible cathodic waves at − 1 . 00 and − 1 . 08
V/s.c.e., which clearly indicates that coordination of the strong-field
ligands provides significant stability to the zinc(II) centre in the title
complex.
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707
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708
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Tong Y, Kang B, Su C, Yu X, Chen X. TRANSIT METAL CHEM 1999; 24:274-276. [DOI: 10.1023/a:1006970726028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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709
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Yang YY, Ng SW, Chen XM. Synthesis and Crystal Structures of Three Carboxylate- Bridged Tetranuclear Copper(II) - Lanthanide(III) Complexes of Ph3P+CH2CH2CO2−. Aust J Chem 1999. [DOI: 10.1071/ch99074] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Three tetranuclear copper(II)–lanthanide(III) complexes of
triphenylphosphoniopropionate
(Ph3P+CH2CH2CO2−,tppp),
namely
[Cu2Ln2(tppp)8(H2O)8](ClO4)10·2H
2 O [Ln = EuIII, NdIII
or CeIII], were synthesized and characterized by
crystallography. The EuIII complex crystallizes in the
triclinic space group P1 – with
a 16.249(7), b 17.185(11),
c 17.807(11) Å, α 69.750(10), β
89.230(10), γ 84.070(10)˚, V 4639(5)
Å3, Z 1. In the crystal
structures, four tppp ligands bridge a pair of CuII and
tetraaquo-EuIII atoms (Cu···Eu
3.527(2) Å) through their µ2-carboxylato
ends to form a dinuclear subunit; two of these subunits are additionally
linked by one of the CuII -bonded carboxylato oxygen
ends, across a centre of inversion, to furnish a dimeric tetranuclear
[Cu(tppp)4
Eu(H2O)4]2
species (Cu···Cu 3.323(2) Å). This
CuII -bonded oxygen atom occupies the apical site of the
square-pyramidal coordination environment of the CuII
atom. The EuIII atom is eight-coordinated in a
square-antiprismatic geometry. The NdIII and
CeIII complexes are isomorphous to the
EuIII complex, and only minor differences in bond
lengths and bond angles involving the metal atoms are noted.
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710
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Long LS, Yang SP, Tong YX, Mao ZW, Chen XM, Ji LN. Synthesis, crystal structures and properties of copper(II) complexes of Schiff base derivatives containing imidazole and β-alanine groups. ACTA ACUST UNITED AC 1999. [DOI: 10.1039/a903154e] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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711
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Chen XM, Wu YL, Yang, Aubin SMJ, Hendrickson DN. Synthesis, Structures, and Magnetic Properties of Carboxylate-Bridged Tetranuclear Copper(II)−Lanthanoid(III) Complexes [Cu2Ln2(betaine)10(H2O)8](ClO4)10·2H2O and [Cu2Ln2(betaine)12(ClO4)2](ClO4)8. Inorg Chem 1998. [DOI: 10.1021/ic980525g] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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712
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Chen XM, Hosono T, Yoda T, Fukuda Y, Kanosue K. Efferent projection from the preoptic area for the control of non-shivering thermogenesis in rats. J Physiol 1998; 512 ( Pt 3):883-92. [PMID: 9769429 PMCID: PMC2231233 DOI: 10.1111/j.1469-7793.1998.883bd.x] [Citation(s) in RCA: 125] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/1998] [Accepted: 07/27/1998] [Indexed: 11/27/2022] Open
Abstract
1. To investigate the characteristics of efferent projections from the preoptic area for the control of non-shivering thermogenesis, we tested the effects of thermal or chemical stimulation, and transections of the preoptic area on the activity of interscapular brown adipose tissue in cold-acclimated and non-acclimated anaesthetized rats. 2. Electrical stimulation of the ventromedial hypothalamic nucleus (VMH) elicited non-shivering thermogenesis in the brown adipose tissue (BAT); warming the preoptic area to 41.5 C completely suppressed the thermogenic response. 3. Injections of d, l-homocysteic acid (DLH; 0.5 mM, 0.3 microliter) into the preoptic area also significantly attenuated BAT thermogenesis, whereas injections of control vehicle had no effect. 4. Transections of the whole hypothalamus in the coronal plane at the level of the paraventricular nucleus induced rapid and large rises in BAT and rectal temperatures. This response was not blocked by pretreatment with indomethacin. The high rectal and BAT temperatures were sustained more than 1 h, till the end of the experiment. Bilateral knife cuts that included the medial forebrain bundle but not the paraventricular nuclei elicited similar rises in BAT and rectal temperatures. Medial knife cuts had no effect. 5. These results suggest that warm-sensitive neurones in the preoptic area contribute a larger efferent signal for non-shivering thermogenesis than do cold-sensitive neurones, and that the preoptic area contributes a tonic inhibitory input to loci involved with non-shivering thermogenesis. This efferent inhibitory signal passes via lateral, but not medial, hypothalamic pathways.
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713
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Chen XM, Levine SA, Tietz P, Krueger E, McNiven MA, Jefferson DM, Mahle M, LaRusso NF. Cryptosporidium parvum is cytopathic for cultured human biliary epithelia via an apoptotic mechanism. Hepatology 1998; 28:906-13. [PMID: 9755224 DOI: 10.1002/hep.510280402] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
While the clinical features of sclerosing cholangitis secondary to opportunistic infections of the biliary tree in patients with acquired immunodeficiency syndrome (AIDS) are well known, the mechanisms by which microbial pathogens such as Cryptosporidium parvum associated with this syndrome actually cause disease are obscure. We established an in vitro model of biliary cryptosporidiosis employing a human biliary epithelial cell line. Using morphological and biochemical techniques, we examined the interaction of C. parvum with cultured human cholangiocytes. When the apical plasma membrane of polarized, confluent monolayers of human biliary epithelial cells was exposed to C. parvum oocysts that had been excysted in vitro, sporozoites attached to and invaded the cells in a time-, dose-, temperature-, and pH-dependent manner. The infectious process was both plasma membrane domain- and cell-specific, because no attachment or invasion occurred when the basolateral membrane of cholangiocytes was exposed to the parasite, or when a human hepatocyte cell line (HepG2) was used. Time-lapse video microscopy and scanning electron microscopy (SEM) showed that sporozoite attachment was rapid, involved extensive cholangiocyte membrane ruffling, and culminated in parasite penetration into a tight-fitting vacuole formed by invagination of the plasma membrane similar to those found in naturally occurring infection in vivo. Transmission electron microscopy (TEM) showed that C. parvum organisms formed parasitophorus vacuoles and were able to undergo a complete reproductive cycle, forming both asexual and sexual reproductive stages. Unexpectedly, direct cytopathic effects were noted in infected monolayers, with widespread programmed cell death (i.e., apoptosis) of biliary epithelial cells as assessed both morphologically and biochemically beginning within hours after exposure to the organism. The novel finding of specific cytopathic invasion of biliary epithelia by C. parvum may be relevant to the pathogenesis and possible therapy of the secondary sclerosing cholangitis seen in AIDS patients with biliary cryptosporidiosis.
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714
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Tong ML, Chen XM, Ye BH, Ng SW. Helical Silver(I)−2,4‘-Bipyridine Chains Organized into 2-D Networks by Metal−Counterion or Metal−Metal Bonding. Structures of [Ag(2,4‘-bipyridine)]X (X- = NO3- or ClO4-). Inorg Chem 1998. [DOI: 10.1021/ic971579d] [Citation(s) in RCA: 156] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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715
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Li WG, Chen XM, Ye YZ, Zhang Y, Yu LF. [Angiotensin II type 2 receptor gene deletion does not affect renin-angiotensin system]. SHENG LI XUE BAO : [ACTA PHYSIOLOGICA SINICA] 1998; 50:460-4. [PMID: 11324558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
It has been postulated that Angiotensin II type 2 receptor (AT2) functionally antagonizes type 1 (AT1) receptor. In the present study, we investigated whether gene deletion of AT2 receptor causes the compensatory chaos of renin-angiotensin system in mice. It was shown that the concentrations of Angiotensin II in plasma and kidney tissues and the expressions of renin and AT1A receptor in the AT2 gene null mice were unchanged, as compared with those in AT2 wild-type mice. This result suggests that gene deletion of AT2 receptor does not markedly impact the stability of renin-angiotensin system and the inductive function of AT2 receptor is compensated in a way remaining to be clarified.
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716
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Kazuyuki K, Hosono T, Zhang YH, Chen XM. Neuronal networks controlling thermoregulatory effectors. PROGRESS IN BRAIN RESEARCH 1998; 115:49-62. [PMID: 9632929 DOI: 10.1016/s0079-6123(08)62029-4] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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717
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Chen XM, Feng XL, Xu ZT, Zhang XH, Xue F, Mak TC. Structural variation and magnetic properties of tetrakis (μ2-carboxylate) -bridged dicopper (II) complexes of betaines with different axial ligands. Polyhedron 1998. [DOI: 10.1016/s0277-5387(98)00020-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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718
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Chen XM, Hosono T, Mizuno A, Yoda T, Yoshida K, Aoyagi Y, Kanosue K. New apparatus for studying behavioral thermoregulation in rats. Physiol Behav 1998; 64:419-24. [PMID: 9748114 DOI: 10.1016/s0031-9384(98)00094-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The operant system described here contains a box that can be convectively heated or cooled. A rat moves freely in the box. Its location is monitored photoelectrically while its deep body temperature is monitored by a telemetry system. In heat-escape experiments, hot air (40 degrees C) flows through the box. When the rat enters a reward zone the air source is switched and cold air (0 degrees C) flows through the box for a given period (30 s). Conversely, in cold-escape experiments cold air flows through the box and when the rat enters the reward zone the air source is switched to a warm one. Experiments show that rats quickly learn to stay near the reward zone and move in and out of it periodically. This system is based on behavior more natural than the frequently used lever-pressing response, and has many advantages for use in studies involving behavioral thermoregulation.
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719
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Tong ML, Ye BH, Cai JW, Chen XM, Ng SW. Clathration of Two-Dimensional Coordination Polymers: Synthesis and Structures of [M(4,4'-bpy)(2)(H(2)O)(2)](ClO(4))(2).(2,4'-bpy)(2).H(2)O and [Cu(4,4'-bpy)(2)(H(2)O)(2)](ClO(4))(4).(4,4'-H(2)Bpy) (M = Cd(II), Zn(II) and bpy = Bipyridine). Inorg Chem 1998; 37:2645-2650. [PMID: 11670398 DOI: 10.1021/ic9714293] [Citation(s) in RCA: 214] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In the presence of guest 2,4'-bpy molecules or under acidic conditions, three compounds, [Cd(4,4'-bpy)(2)(H(2)O)(2)](ClO(4))(2).(2,4'-bpy)(2).H(2)O (1), [Zn(4,4'-bpy)(2)(H(2)O)(2)](ClO(4))(2).(2,4'-bpy)(2).H(2)O (2), and [Cu(4,4'-bpy)(2)(H(2)O)(2)](ClO(4))(4).(4,4'-H(2)bpy) (3), were obtained from the reactions of the metal salts and 4,4'-bpy in an EtOH-H(2)O mixture. 1 has a 2-D square-grid network structure, crystallizing in the monoclinic space group P2/n, with a = 13.231(3) Å, b = 11.669(2) Å, c = 15.019(3) Å, beta = 112.82(3) degrees, Z = 2; 2 is isomorphous with 1, crystallizing in the monoclinic space group P2/n, with a = 13.150(3) Å, b = 11.368(2) Å, c = 14.745(3) Å, beta = 110.60(3) degrees, Z = 2. The square grids superpose on each other into a channel structure, in which each layer consists of two pairs of shared edges, perfectly square-planar with an M(II) ion and a 4,4'-bpy at each corner and side, respectively. The square cavity has dimensions of 11.669(2) x 11.788(2) and 11.368(2) x 11.488(2) Å for 1 and 2, respectively. Every two guest 2,4'-bpy molecules are clathrated in each hydrophobic host cavity and are further stabilized by pi-pi stacking and hydrogen bonding interactions. The NMR spectra clearly confirm that both 1 and 2 contain 4,4'-bpy and 2,4'-bpy molecules in a 1:1 ratio, which have stacking interaction with each other in the solution. 3 crystallizes in the orthorhombic space group Ibam, with a = 11.1283(5) Å, b = 15.5927(8) Å, c = 22.3178(11) Å, Z = 4. 3 is made up of two-dimensional square [Cu(4)(4,4'-bpy)(4)] grids, where the square cavity has dimensions of 11.13 x 11.16 Å. Each [4,4'-H(2)bpy](2+) cation is clathrated in a square cavity and stacks with one pair of opposite edges of the host square cavity in an offset fashion with the face-to-face distance of ca. 3.95 Å. Within each cavity, the [4,4'-H(2)bpy](2+) cation forms twin three-center hydrogen bonds with two pairs of ClO(4)(-) anions. The results suggest that the guest 2,4'-bpy molecules and protonated [4,4'-H(2)bpy](2+) cations present in the reaction systems serve as structure-directing templates in the formation of the crystal structures and exclude self-inclusion of the networks having larger square cavities.
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720
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Li TJ, Kitano M, Chen XM, Itoh T, Kawashima K, Sugihara K, Nozoe E, Mimura T. Orthokeratinized odontogenic cyst: a clinicopathological and immunocytochemical study of 15 cases. Histopathology 1998; 32:242-51. [PMID: 9568510 DOI: 10.1046/j.1365-2559.1998.00380.x] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
AIMS Intraosseous jaw cysts with a solely orthokeratinized lining epithelium have been suggested to differ from the typical odontogenic keratocysts (OKC) by exhibiting a less aggressive behaviour. We report 15 cases of such cyst type under the term of 'orthokeratinized odontogenic cyst (OOC)' and compared their clinical, histological and immunocytochemical features with that of OKC. METHODS AND RESULTS The cysts of the present series were all solitary lesions, occurred mostly in young male patients, and showed a predilection for the posterior mandible areas. Follow-up of 14 patients, nine of whom were treated by simple enucleation, revealed no recurrence over a period of 3.5-12 years after surgery. None of the patients had any association with the naevoid basal cell carcinoma syndrome. Furthermore, histological and immunocytochemical comparison between OOC and OKC revealed marked differences in their morphology and epithelial expression. The lining epithelium of OOC lacked the typical features of OKC and appeared to show a lower proliferative activity. CONCLUSION These findings suggest that OOC is clinicopathologically separate from other types of odontogenic cysts and may thus constitute a distinct clinical entity.
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721
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Tong ML, Cai JW, Yu XL, Chen XM, Ng SW, Mak TCW. Linear Metal(II)-4,4′-Bipyridine (4,4′-bpy) Chains Organized into Two-Dimensional Rhombic Networks by Hydrogen Bonding. Crystal Structures of [Co(4,4′-bpy)(H2O)4] (ClO4)2.(4,4′-bpy)2.2H2O and [Zn(4,4′-bpy)(H2O)3(ClO4)] (ClO4).(4,4′-bpy)1·5.H20. Aust J Chem 1998. [DOI: 10.1071/c97207] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Two substances with extended two-dimensional networks through hydrogen-bond
cross linkages, namely,
[Co(4,4′-bpy)(H2O4]
(ClO4)2.(4,4′-bpy)2.2H2O
and
[Zn(4,4′-bpy)(H2O)3(ClO4)]
(ClO4).(4,4′-
bpy)1·5.H2O, were
synthesized, in EtOH/H2O solution. The cobalt
complex crystallizes in the triclinic space group
P-1 with a
9·113(2), b 11· 093(2),
c 11·394(2) Å, α 64·04(3),
β 70·18(3), γ 66·91(3)°, V
932·9(3) Å3. The crystal structure contains
4,4′-bpy-bridged linear polymeric
[Co(4,4′-bpy)(H2O)4]n
chains, where the cobalt(II) is coordinated in a slightly distorted octahedral
environment by four water molecules (Co-O 2·088(2)-2·101(2)
Å) at the equatorial positions and two nitrogen atoms of the bridging
4,4′-bpy ligands (Co–N 2·149(2) Å) at the axial
positions. The chains are interconnected into a two-dimensional rhombic
network by double hydrogen-bond bridges of the type
Co–H2O · · · bpy ·
· · H2O–Co. The zinc complex also
crystallizes in the triclinic space group
P-1 with a
9·0230(11), b 11·299(2),
c 16·397(2) Å, α 74·429(11),
β 83·132(9), γ 70·654(12)°, V
1518·5(3) Å3. The crystal structure
contains 4,4′-bpy-bridged linear polymeric
[Zn(4,4′-bpy)(H2O)3(ClO4)]n
chains, where the zinc atom is coordinated in a distorted octahedral
environment by two nitrogen atoms of the bridging 4,4′-bpy ligands
(Z–N 2·104(2)–2·117(2) Å), three water
molecules (Zn–O 2·068(2)–2·091(2) Å) and one
monodentate ClO4- anion (Zn–O 2·320(2)
Å). The chains are interconnected into a rhombic network alternately by
single or double hydrogen-bond bridges of the type
Zn–H2O · · · 4,4′-bpy
· · · H2O–Zn.
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722
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Tong ML, Chen XM, Yu XL, Mak TCW. A novel two-dimensional rectangular network. Synthesis and structure of {[Cu(4,4′-bpy)(pyz)(H2O)2][PF6]2}n (4,4′-bpy = 4,4′-bipyridine, pyz = pyrazine). ACTA ACUST UNITED AC 1998. [DOI: 10.1039/a706363f] [Citation(s) in RCA: 110] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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723
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Ye BH, Chen XM, Xue GQ, Ji LN. Mononuclear nickel complexes assembled into two-dimensional networks via hydrogen bonds and π–π stacking interactions. ACTA ACUST UNITED AC 1998. [DOI: 10.1039/a802695e] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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724
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Zhang YH, Hosono T, Yanase-Fujiwara M, Chen XM, Kanosue K. Effect of midbrain stimulations on thermoregulatory vasomotor responses in rats. J Physiol 1997; 503 ( Pt 1):177-86. [PMID: 9288685 PMCID: PMC1159897 DOI: 10.1111/j.1469-7793.1997.177bi.x] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
1. Efferent projections eliciting vasodilatation when the preoptic area is warmed were investigated by monitoring tail vasomotor responses of ketamine-anaesthetized rats when brain areas were stimulated electrically (0.2 mA, 200 microseconds, 30 Hz) or with the excitatory amino acid D,L-homocysteic acid (1 mM, 0.3 microliter). 2. Both stimulations elicited vasodilatation when applied within a region extending from the most caudal part of the lateral hypothalamus to the ventrolateral periaqueductal grey matter (PAG) and the reticular formation ventrolateral to the PAG. 3. Vasodilatation elicited by preoptic warming was suppressed when either stimulation was applied within the rostral part of the ventral tegmental area (VTA). 4. Sustained vasodilatation was elicited by knife cuts caudal to the VTA, and vasodilatation elicited by preoptic warming was suppressed by cuts either rostral to the VTA or in the region including the PAG and the reticular formation ventrolateral to it. 5. These results, together with the results of earlier physiological and histological studies, suggest that warm-sensitive neurones in the preoptic area send excitatory signals to vasodilatative neurones in the caudal part of the lateral hypothalamus, ventrolateral PAG and reticular formation, and send inhibitory signals to vasoconstrictive neurones in the rostral part of the VTA.
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725
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Gu YD, Cheng DS, Zhang GM, Chen XM, Xu JG, Yang XB. Long-term results of toe transfer: retrospective analysis. J Reconstr Microsurg 1997; 13:405-8. [PMID: 9273902 DOI: 10.1055/s-2007-1006420] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Between February 1966 and February 1994, 400 cases of toe transplantation were analyzed, to evaluate toe-transfer procedures in thumb and finger reconstruction. Techniques utilized included single second-toe transfer, with and without the metatarsophalangeal joint (299): second- and third-toe transfer (28); second-toe and third proximal phalanx transfer (1); second-toe with flap transfers (66); and hallux nail flap with second toe or second and third toe transfer (6). There was a survival rate of 96.5 percent, with 386 cases surviving and 14 failing. A more than 2-year follow-up was possible in 240 cases. Excellent motor and sensory function (more than 90 percent of normal) was achieved in the reconstructed fingers and thumbs, as well as satisfactory function (between 86 and 91 percent of normal) in the donor foot.
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726
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Hosono T, Chen XM, Zhang YH, Kanosue K. Effects of estrogen on thermoregulatory responses in freely moving female rats. Ann N Y Acad Sci 1997; 813:207-10. [PMID: 9100885 DOI: 10.1111/j.1749-6632.1997.tb51695.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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727
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Zhang YH, Yamada K, Hosono T, Chen XM, Shiosaka S, Kanosue K. Efferent neuronal organization of thermoregulatory vasomotor control. Ann N Y Acad Sci 1997; 813:117-22. [PMID: 9100871 DOI: 10.1111/j.1749-6632.1997.tb51681.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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728
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Chen ZN, Li WJ, Kang BS, Hong MC, Zhou ZY, Mak TCW, Lin Z, Chen XM, Liu HQ. Heterooctanuclear Cluster Complex Formation with Phosphine Participation: Synthesis, Structure, and Magnetic Properties of Co6Ru2(mp)10(PBun3)6(H2mp = 2-Mercaptophenol, PBun3= Tri-n-butylphosphine). Inorg Chem 1997. [DOI: 10.1021/ic960239+] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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729
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Long DL, Xin XQ, Chen XM, Kang BS. Synthesis and X-ray crystal structure of a polymetallate with a metal complex cation as counter ion, [Ag(PPh3)4]2Mo6O19·3CH2Cl2. Polyhedron 1997. [DOI: 10.1016/s0277-5387(96)00359-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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730
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Yang C, Zhou QH, Yang C, Chen XM, Lu XQ, Yang YS. First metal-encapsulating star polysulfoxide incorporating 2-amino-1,3,4-thiadiazole. Chem Commun (Camb) 1997. [DOI: 10.1039/a703677i] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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731
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Tong YX, Chen XM, Weng Ng S. Synthesis and crystal structures of two polymeric cadmium(II) complexes containing skew-skew carboxylato-bridges. Polyhedron 1997. [DOI: 10.1016/s0277-5387(97)00080-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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732
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Chen XM, Huang XC, Tong ML, Tong YX, Ng SW. Synthesis and Crystal Structures of Two Monomeric Zinc(II) Complexes Containing Carboxylate and Aqua Ligands. Aust J Chem 1997. [DOI: 10.1071/c97019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Two monomeric zinc(II) complexes of betaine
(Me3N+CH2CO2¯
= bet),
[Zn(bet)2(H2O)Cl]
(ClO4) (1) and
[Zn(bet)3(H2O)]
(ClO4)2 (2), have been prepared
and characterized by single-crystal structural analysis. The zinc atom in both
complexes is coordinated in a distorted tetrahedral geometry: the zinc atom in
complex (1) is surrounded by one aqua ligand (Zn–O 1·979(3)
Å), one chloro ligand (Zn–Cl 2·218(1) Å ) and two
monodentate carboxylate groups (Zn–O 1·946(2) Å); the zinc
atom in complex (2) is ligated by one aqua ligand (Zn–O 1·997(6)
Å) and three monodentate carboxylategroups (Zn–O
1·943(5)–2·106(8) Å). In both complexes, the aqua
ligand forms strong donor hydrogenbonds with adjacent carboxylate oxygens (for
complex (1), O · · · O is 2·689(2) Å; for
complex (2), O · · · O are 2·67(1) and
2·709(8) Å); these interactions are discussed in the context of
zinc complexesand enzyme active sites.
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733
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Chen XM, Yu XL, Yao YX, Huang XY. Synthesis and structure of a novel dinuclear copper(II) complex containing 1,4,7-triazacyclododecane [Cu2(HO) (MeCO2) (tacd)2](Cl04)2. Polyhedron 1997. [DOI: 10.1016/0277-5387(96)00259-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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734
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Chen XM, Ploux O, Liu HW. Biosynthesis of 3,6-dideoxyhexoses: in vivo and in vitro evidence for protein-protein interaction between CDP-6-deoxy-L-threo-D-glycero-4-hexulose 3-dehydrase (E1) and its reductase (E3). Biochemistry 1996; 35:16412-20. [PMID: 8987972 DOI: 10.1021/bi961921i] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
CDP-6-deoxy-L-threo-D-glycero-4-hexulose 3-dehydrase (E1), together with its reductase (E3), catalyzes a novel deoxygenation reaction essential for the biosynthesis of 3,6-dideoxyhexoses. In an attempt to gain evidence substantiating the E1.E3 complex formation as a prerequisite for the C-3 deoxygenation activity, we have carried out experiments to study the interaction between these two proteins. The detection of a new species when a mixture of E1 and E3 was analyzed by size-exclusion chromatography was the initial indication supporting the proposed complex formation. Additional evidence for the expected complex formation was provided by the change of the CD spectrum of E1 upon its coupling with E3. The fact that the catalytic efficiency of this system is limited by the quantity of one enzyme, which becomes catalytically competent only after coupling with the second enzyme, further illustrated the importance of such a complex formation to the deoxygenation activity. By using the two-hybrid system which scores for interactions between two proteins coexpressed in yeast, the E1.E3 complex formation in vivo was also firmly established. These results, when considered with the incompatibility of other electron transfer proteins as replacements for E3 in this electron relay, nicely demonstrated the specificity of the E1-E3 recognition. The apparent dissociation constant of the E1.E3 complex formed in rapid equilibrium was estimated to be 288 +/- 22 nM from the correlation between the initial rate of the overall reaction and the concentration of one protein component, and the stoichiometry between E3 and E1 of this complex was deduced as 1.7. Interestingly, while the conformation of the E1.E3 complex was sensitive to the salt concentration in the buffer, the decrease in the catalytic activity at high ionic strength was most likely due to the retardation of the electron transfer mediated by E3. In conjunction with early mechanistic studies, the present data establish the significance of the E1.E3 complex formation for catalysis and, consequently, corroborate the mechanism proposed for the overall deoxygenation process.
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735
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Fukuda T, Kitada Y, Chen XM, Yang L, Miyase T. Two new monoterpene glycosides from ku-ding-cha. Inhibitors of acyl-CoA: cholesterol acyltransferase (ACAT). Chem Pharm Bull (Tokyo) 1996; 44:2173-6. [PMID: 8945784 DOI: 10.1248/cpb.44.2173] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Two new monoterpene glycosides, kudingosides A and B, were isolated from Ku-Ding-Cha (Ligustrum pedunculare REHD.), together with a known monoterpene glycoside, (S)-lipedoside B-III, and three known phenylethanoid glycosides. Their structures were elucidated by spectroscopic and chemical means. Kudingosides A and B, and (S)-lipedoside B-III inhibited acyl-CoA: cholesterol acyltransferase (ACAT) with IC50 values of 2.70 x 10(-3)M, 2.88 x 10(-3)M, and 2.69 x 10(-4)M, respectively.
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736
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Kang BS, Chen XM, Gao HR, Wu BM, Mak TCW. Mixed Coordination Modes of 1,2-bis(Diphenylphosphino)Ethane in the Ionic Triiron(II) Complex [Fe(dppe)2(MeCN)2][(FeCl3)2(μ2-dppe)]. ACTA ACUST UNITED AC 1996. [DOI: 10.1080/00945719608004398] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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737
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Li TJ, Chen XM, Wang SZ, Fan MW, Semba I, Kitano M. Kimura's disease: a clinicopathologic study of 54 Chinese patients. ORAL SURGERY, ORAL MEDICINE, ORAL PATHOLOGY, ORAL RADIOLOGY, AND ENDODONTICS 1996; 82:549-55. [PMID: 8936520 DOI: 10.1016/s1079-2104(96)80202-2] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Kimura's disease, a chronic inflammatory condition of unknown cause, is endemic in Orientals. The present study documented 54 cases of Kimura's disease in patients from mainland China. The main clinical features of this series included young and middle-aged male predominance (male:female = 3.5:1), predilection for the head and neck regions, and a long duration. The disease presented as either single (31 cases), or multiple lesions (23 cases), and mainly involved subcutaneous tissues (29 cases), major salivary glands (21 cases), and lymph nodes (17 cases) in isolation or in combination. Histopathologically, the lesion was characterized by hyperplasia of lymphoid tissue with well-developed lymphoid follicles, marked infiltration of eosinophils, proliferation of thin-walled capillary venules, and varying degrees of fibrosis. Distinctive features of salivary glands and nodal involvement were also described. Differences between Kimura's disease and angiolymphoid hyperplasia with eosinophilia, mostly reported in the West, were discussed to draw attention to their distinction.
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738
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Chen XM, Feng XL, Tong YX, Zhang XH, C.W. Mak T. A novel monomeric manganese(ii) carboxylate. preparation and structure of Na2[Mn(Me3NCH2CH2CO2)4(H2O)2](ClO4)4 · 4H2O. Polyhedron 1996. [DOI: 10.1016/0277-5387(96)00075-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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739
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Yi SN, Chen XM, Quinn JJ. Composite-fermion excitations and the electronic spectra of fractional quantum Hall systems. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:9599-9601. [PMID: 9982510 DOI: 10.1103/physrevb.53.9599] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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740
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Chen XM, Ye BH, Huang XC, Xu ZT. Model complexes for the carboxylate–histidine–metal triad systems in metalloenzymes. Synthesis, crystal structures and spectroscopic properties of [M(Him)2(O2CMe)2](M = ZnIIor CoII, Him = imidazole). ACTA ACUST UNITED AC 1996. [DOI: 10.1039/dt9960003465] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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741
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Chen XM, Wu YL, Tong YX, Huang XY. Novel octadecanuclear copper(II)–lanthanoid(III) clusters. Synthesis and structures of [Cu12Ln6(µ3-OH)24(O2CCH2CH2NC5H5)12(H2O)16(µ12-ClO4)][ClO4]17·16H2O (LnIII= GdIIIor SmIII). ACTA ACUST UNITED AC 1996. [DOI: 10.1039/dt9960002443] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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742
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Chen XM, Tong ML, Luo YJ, Chen ZN. Inclusion of 4,4'-Bipyridine (γbpy) in Its Copper(II) Aqua Perchlorato Complex. Crystal Structure of [Cu( γbpy )(H2O)2(ClO4)2]n.( γbpy )n. Aust J Chem 1996. [DOI: 10.1071/ch9960835] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
An example of a 4,4'-bipyridine ( γbpy ) clathrate in its copper(II) complex has been established. The compound, [Cu( γbpy )(H2O)2(ClO4)2]n.( γbpy )n, crystallizes in the monoclinic space group C2/c with a 16.651(3), b 11.089(2), c 14.360(3) Ǻ, β 116.45(3)°, V 2373.9(8)Ǻ3. The crystal structure comprises γbpy -bridged linear polymeric [Cu( γbpy )(H2O)2(ClO4)2]n chains, where the copper atom, located on a crystallographic twofold axis, is coordinated in an elongated octahedral environment by two nitrogen atoms of the bridging γbpy ligands (Cu-N 1.998(4)Ǻ) and two water molecules (Cu-O 1.968(3)Ǻ) at the equatorial positions, and two perchlorate oxygen atoms at the axial positions (Cu-O 2.414(4)Ǻ). The chains are interconnected by hydrogen bonds between the aqua ligands and the uncoordinated perchlorate oxygen atoms to form two-dimensional layers with cavities each enclosing a γbpy molecule. Hydrogen bonding between the aqua ligands and the nitrogen atoms of the solvate γbpy molecules further extends the structure into a three-dimensional network in the solid.
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743
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Yang C, Chen XM, Zhang WH, Chen J, Yang YS, Gong ML. Synthesis, crystal structure and luminescence properties of a europium(III) complex with a new planar aromatic tridentate N3 ligand. ACTA ACUST UNITED AC 1996. [DOI: 10.1039/dt9960001767] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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744
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Chen XM, Tong ML, Wu YL, Luo YJ. Synthesis and structure of a novel carboxylate-bridged heterometallic copper(II)–gadolinium(III) complex. ACTA ACUST UNITED AC 1996. [DOI: 10.1039/dt9960002181] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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745
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Cheng QL, Orikasa M, Morioka T, Kawachi H, Chen XM, Oite T, Shimizu F. Progressive renal lesions induced by administration of monoclonal antibody 1-22-3 to unilaterally nephrectomized rats. Clin Exp Immunol 1995; 102:181-5. [PMID: 7554387 PMCID: PMC1553319 DOI: 10.1111/j.1365-2249.1995.tb06653.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
A new animal model of progressive glomerulosclerosis was developed by administering a single i.v., injection of MoAb 1-22-3 to unilaterally nephrectomized rats. Renal morphological analysis revealed that glomerular lesions characterized by mesangial cell proliferation and mesangial matrix expansion were induced in about 95% of the glomeruli. Approximately 20% of the glomeruli of the unilaterally nephrectomized rats showed sclerosis or segmental sclerosis by week 6 after MoAb injection and crescent formation was observed in some glomeruli (ca 4%). Cellular infiltration was also noted in some parts of the interstitium. Increased expression of transforming growth factor-beta (TGF-beta) was observed in the unilaterally nephrectomized rats treated with MoAb 1-22-3, but we could not demonstrate pathological involvement of platelet-derived growth factor (PDGF), even though early-stage mesangial cell proliferation was observed. The mechanism of mesangial cell proliferation in this model remains to be elucidated. The relatively short period of time needed to induce the sclerotic changes in considered to be a great advantage of this model for clarifying the mechanisms involved in the chronic progression of mesangial proliferative glomerulonephritis.
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746
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Chen XM, Pan JQ, Zhang ZN. Effects of propylene glycol mannate sulfate on thrombosis in abdominal aorta in rabbits. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1995; 16:226-30. [PMID: 7660816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
AIM To study the effects of propylene glycol mannate sulfate (PGMS) on platelet adhesion, aggregation and thrombosis in abdominal aorta in rabbits. METHODS Platelet adhesion assay was performed with a platelet-adhesion-meter. The platelet concentration was determined with an electronic particle counter, and the total radio-activity was determined with Clinigamma-1272. RESULTS PGMS inhibited washed platelet aggregation induced by thrombin in vitro. The value of IC50 was 0.9 mg.L(-1). (95% confidence limit = 4.1-13.7 mg.L(-1). At 10, 30, and 60 min after i.v. PGMS 75 mg.kg(-1), the inhibition rates of platelet adhesion were 90.4%, 41.8%, and 26.3% and the inhibition rates of platelet aggregation induced by thrombin were 99%, 122%, and 110%, respectively. It did not exhibit any noticeable effect on platelet aggregation induced by ADP and collagen at this dosage. After 1.5 h of i.v. PGMS 75 mg.kg-1 and total autologous 111In-platelets 3.3 x 10(9) the radioactivity and dry weight of the injured and uninjured segments were determined. The PGMS group showed a significantly lower radioactivity (1.1 +/- 0.6 MBq), 111In-platelets (8.3 +/- s 3.3 x 10(8)) as well as the radioactivity deposited.g(-1) out of the total radioactivity infused % (0.24 +/- 0.21) compared with the control group (3.7 +/- 0.5 MBq, 24.6 +/- 3.5 x 10(8), and 0.86 +/- 0.25, respectively). CONCLUSION PGMS prevented the platelet adhesion and aggregation at the injured arterial wall.
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747
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Liao HJ, Chen XM, Li WG. [Effect of Epimedium sagittatum on quality of life and cellular immunity in patients of hemodialysis maintenance]. ZHONGGUO ZHONG XI YI JIE HE ZA ZHI ZHONGGUO ZHONGXIYI JIEHE ZAZHI = CHINESE JOURNAL OF INTEGRATED TRADITIONAL AND WESTERN MEDICINE 1995; 15:202-4. [PMID: 7647539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Our previous study had demonstrated that Chinese medicine Epimedium Sagittatum (ES) exerted immuno-enhancing effect on the animal model of chronic renal insufficiency. In present study, we investigated the therapeutic effect of ES on patients of hemodialysis maintenance. 22 cases of regular hemodialytic patients were treated with ES in the form of decoction. 12 patients with hemodialysis were served as controls. It was found that ES had sexual potentiation effect and improved the quality of life in the patients of chronic renal failure with regular hemodialysis. Interleukin 2 (IL-2) activity of peripheral blood monocytes (PBMC) stimulated by PHA was increased significantly in the patients treated with ES. It was suggested that Chinese medicine ES had therapeutic effect on sexual disorder and immunologic inadequacy in the patients of chronic renal failure undergoing hemodialysis.
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748
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Dallas CE, Chen XM, Muralidhara S, Varkonyi P, Tackett RL, Bruckner JV. Physiologically based pharmacokinetic model useful in prediction of the influence of species, dose, and exposure route on perchloroethylene pharmacokinetics. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH 1995; 44:301-17. [PMID: 7897693 DOI: 10.1080/15287399509531961] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The ability of a physiologically based pharmacokinetic (PBPK) model to predict the uptake and elimination of perchloroethylene (PCE) in venous blood was evaluated by comparison of model simulations with experimental data for two species, two routes of exposure, and three dosage levels. Unanesthetized male Sprague-Dawley rats and beagle dogs were administered 1, 3, or 10 mg PCE/kg body weight in polyethylene glycol 400 as a single bolus, either by gavage or by intraarterial (ia) injection. Serial blood samples were obtained from a jugular vein cannula for up to 96 h following dosing. The PCE concentrations were analyzed by headspace gas chromatography. For each dose and route of administration, terminal elimination half-lives in rats were shorter than in dogs, and areas under the blood concentration-time curve were smaller in rats than in dogs. Over a 10-fold range of doses, PCE blood levels in the rat were well predicted by the PBPK model following ia administration, and slightly underpredicted following oral administration. The PCE concentrations in dog blood were generally overpredicted, except for fairly precise predictions for the 3 mg/kg oral dose. These studies provide experimental evidence of the utility of the PBPK model for PCE in interspecies, route-to-route, and dose extrapolations.
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749
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Chen XM, Quinn JJ. Energy spectra of anyonic ions and anyonic excitons in fractional quantum Hall systems. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:5578-5581. [PMID: 9979463 DOI: 10.1103/physrevb.51.5578] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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750
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Chen XM, Tong YX, Xu ZT, Mak TCW. Synthesis, structure and magnetic properties of a singly carboxylate-bridged dinuclear manganese(II) complex. ACTA ACUST UNITED AC 1995. [DOI: 10.1039/dt9950004001] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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