1126
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Kim H, Oden E, Lin C. High-pressure liquid chromatographic method for determination of Sch 29482 in human serum. Antimicrob Agents Chemother 1982; 22:848-51. [PMID: 7181491 PMCID: PMC185671 DOI: 10.1128/aac.22.5.848] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
A high-pressure liquid chromatographic method was developed for quantitative determination in human serum of a new penem antibiotic known as Sch 29482 (5R,6S,8R-2-ethylthio-6(1-hydroxyethyl)penem-3-carboxylic acid). The method involves serum extraction at an acid pH with ether, followed by separation on a reverse-phase column and UV light detection at 254 nm. This technique produced a good linear relationship between the peak height ratio and the Sch 29482 concentration, which ranged from 0.09 to 35.64 micrograms/ml. In addition, this procedure proved to be quite specific for Sch 29482, since all beta-lactam antibiotics tested did not interfere with the assay. For high concentrations (greater than 0.5 micrograms/ml), the mean values obtained from the high-pressure liquid chromatographic method correlated very well (r = 0.997) with those obtained from a microbiological assay. This method is accurate and reproducible, with a sensitivity of about 0.09 micrograms per ml of serum. It is useful for monitoring serum drug levels in animals and humans and can also be used for drug pharmacokinetic studies in humans.
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1127
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Lin C, Zhang TM. [The cytokinetic effects of bimolane (AT-1727) on S180 cells]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1982; 17:654-7. [PMID: 7158349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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1128
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Lin C, Lim J, DiGiore C, Gural R, Symchowicz S. Comparative bioavailability of a microsize and ultramicrosize griseofulvin formulation in man. J Int Med Res 1982; 10:274-7. [PMID: 7117684 DOI: 10.1177/030006058201000415] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
The bioavailability of 500 mg of a microsize formulation of griseofulvin has been compared to two new ultramicrosize griseofulvin formulations, two 165 mg tablets and a 330 mg tablet, in sixteen healthy, male, volunteers in a randomized crossover study design. Based on the griseofulvin plasma levels measured at specified times over a 48-hour period, the major bioavailability parameters (i.e., area under plasma concentration-time curve, maximum plasma concentration, and time to reach maximum plasma concentration) were determined and statistically evaluated. The results showed that one 330 mg ultramicrosize tablet is bioequivalent to two 165 mg ultramicrosize griseofulvin tablets and that either ultramicrosize griseofulvin dosage regimen is bioequivalent to 500 mg of the microsize griseofulvin formulation.
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1129
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Ricquier D, Lin C, Klingenberg M. Isolation of the GDP binding protein from brown adipose tissue mitochondria of several animals and amino acid composition study in rat. Biochem Biophys Res Commun 1982; 106:582-9. [PMID: 6285923 DOI: 10.1016/0006-291x(82)91150-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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1130
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Lin C, Lim J, Symchowicz S. Comparative bioavailability of d-pseudoephedrine from a conventional d-pseudoephedrine sulfate tablet and from a repeat action tablet. J Int Med Res 1982; 10:126-8. [PMID: 7067924 DOI: 10.1177/030006058201000211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
The bioavailability of a single dose of d-pseudoephedrine sulfate administered to male volunteers in repeat action tablet form (60 mg d-pseudoephedrine sulfate in the coat and 60 mg d-pseudoephedrine sulfate in the core) was compared with the bioavailability of an equivalent quantity of the drug given as two 60 mg conventional tablets, one given at 0 hour and the second 6 hours later. There was no significant difference (P less than 0.10) between the conventional tablets and the repeat action tablet formulation in area under the plasma concentration-time curve and the maximum plasma concentration of d-pseudoephedrine. Based on the data, we conclude that the repeat action tablet formulation and the conventional tablet are bioequivalent.
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1131
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Lin C, Lim J, Symchowicz S. Bioavailability of d-pseudoephedrine and azatadine from a repeat action tablet formulation. J Int Med Res 1982; 10:122-5. [PMID: 7067923 DOI: 10.1177/030006058201000210] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
The objective of this study was to compare in man the bioavailability of d-pseudoephedrine and azatadine from a repeat action tablet formulation and from conventional tablets. The repeat action tablet, containing 1 mg of azatadine maleate in the coat, and 60 mg of d-pseudoephedrine sulfate in both the coat and the core, was given at 0 hour. A conventional tablet of 60 mg of d-pseudoephedrine sulfate was given at 0 and 4 hours and a conventional tablet of 1 mg of azatadine maleate was given at 0 hour. The plasma levels of d-pseudoephedrine were measured by gas-liquid chromatography and the amount of azatadine in the urine was determined by a mass fragmentographic procedure. The results showed that there were no statistically significant differences in the measured bioavailability parameters (area under plasma concentrations-time curve, maximum plasma concentration and time to reach maximum plasma concentration) for pseudoephedrine from repeat action tablets and conventional d-pseudoephedrine sulfate tablets; neither was there any statistically significant difference in the cumulative urinary excretion of azatadine from the repeat action tablets and conventional azatadine maleate tablets (p less than 0.10). These data clearly demonstrate the bioequivalence of the repeat action tablets and the conventional tablets of d-pseudoephedrine and azatadine.
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1132
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Lin C, Kim H, Chung M, Symchowicz S. Pharmacokinetics of Sch 29482 in rats. J Antimicrob Chemother 1982; 9 Suppl C:233-7. [PMID: 7061373 DOI: 10.1093/jac/9.suppl_c.233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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1133
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Gural R, Lin C, Chung M, Oden E, Digiore C. Oral absorption and tolerance in man, of a new penem antibiotic, Sch 29428. J Antimicrob Chemother 1982; 9 Suppl C:239-43. [PMID: 7061374 DOI: 10.1093/jac/9.suppl_c.239] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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1134
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Lin C, Reed WA, Pearson AD, Shang HT. Phase matching in the minimum-chromatic-dispersion region of single-mode fibers for stimulated four-photon mixing. OPTICS LETTERS 1981; 6:493-495. [PMID: 19710748 DOI: 10.1364/ol.6.000493] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We describe phase-matched stimulated four-photon mixing in single-mode fibers in the minimum-chromatic-dispersion region. Phase matching is achieved by using the refractive-index slope change and the guiding properties of the fundamental mode. Experimental results on large-shift (1600-cm(-1)) single-idler generation in single-mode fibers with 1.319-microm Nd:YAG laser pumping are presented.
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1135
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Zhang TM, Chen ZY, Lin C. [Antineoplastic action of triptolide and its effect on the immunologic functions in mice (author's transl)]. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1981; 2:128-31. [PMID: 6461212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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1136
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Stolen RH, Bösch MA, Lin C. Phase matching in birefringent fibers. OPTICS LETTERS 1981; 6:213-215. [PMID: 19701380 DOI: 10.1364/ol.6.000213] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We describe a new technique that utilizes birefringence for phase matching of stimulated parametric emission in a single-mode optical fiber. The frequency shift between the generated frequencies and the pump frequency can be controlled over a wide range (approximately 1000 cm(-1)) by the magnitude of birefringence built into the fiber.
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1137
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Lin C, Kogelnik H, Cohen LG. Optical-pulse equalization of low-dispersion transmission in single-mode fibers in the 1.3 - 1.7-microm spectral region. OPTICS LETTERS 1980; 5:476-478. [PMID: 19701277 DOI: 10.1364/ol.5.000476] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We describe a simple optical-pulse-equalization technique for minimizing pulse dispersion in a single-mode fiber transmission system utilizing the positive- and the negative-dispersion characteristics of single-mode fibers on both sides of a zero-chromatic-dispersion wavelength.
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1138
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Lin C, Kim H, Schuessler D, Oden E, Symchowicz S. High-pressure liquid chromatographic method for determination of rosaramicin in humans. Antimicrob Agents Chemother 1980; 18:780-3. [PMID: 7447432 PMCID: PMC284091 DOI: 10.1128/aac.18.5.780] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
A high-pressure liquid chromatographic method has been developed for the quantitative determination of rosaramicin in serum. This procedure involves addition of an internal standard, adjustment to alkaline pH, treatment with potassium carbonate, ether extraction, and a reverse-phase column separation with acetonitrile-acetate buffer mixture as the mobile phase. This technique produces a good linear relationship between the peak height ratio and the rosaramicin concentration. In addition, this method has proven to be quite specific for rosaramicin, since many of its derivatives tested do not interfere with the assay. The method is accurate and reproducible with a sensitivity of about 0.01 microgram of rosaramicin per ml of serum. It may be useful in monitoring drug levels in serum of patients and also for the pharmacokinetic studies of the drug in humans.
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1139
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Zhang TM, Chen ZY, Lin C. [Pharmacological studies on bimolane (AT-1727), a new antineoplastic agent (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1980; 15:577-83. [PMID: 7257778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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1140
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Raisfeld IH, Lin C. Nitrosamine formation from interaction of isosorbide dinitrate and hydroxyzine HCl, a tertiary amine. Biochem Pharmacol 1979; 28:3451-5. [PMID: 533549 DOI: 10.1016/0006-2952(79)90085-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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1141
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Bloom DM, Mollenauer LF, Lin C, Taylor DW, Delgaudio AM. Direct demonstration of distortionless picosecond-pulse propagation in kilometer-length optical fibers. OPTICS LETTERS 1979; 4:297-299. [PMID: 19687882 DOI: 10.1364/ol.4.000297] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We describe the use of a mode-locked color-center laser to demonstrate nearly distortionless propagation of ~5-psec-wide, Fourier-transform-limited pulses, at or near the zero-dispersion wavelength, in two fused-silica, singlemode fibers of 0.76- and 2.5-km length, respectively. We also report the detection of sharply defined cross correlations between pulses directly from the laser and those had been delayed many microseconds by passage through a fiber.
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1142
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Lin C, Joseph-Bravo P, Sherman T, Chan L, McKelvy JF. Cell-free synthesis of putative neurophysin precursors from rat and mouse hypothalamic poly (A)-RNA. Biochem Biophys Res Commun 1979; 89:943-50. [PMID: 486213 DOI: 10.1016/0006-291x(79)91869-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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1143
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Lin MC, Lin C, Whitlock JP. Reduction of GTP activation of adenylate cyclase system by its coupling to hormone receptor. J Biol Chem 1979; 254:4684-8. [PMID: 86543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
We have examined the characteristics of the adenylate cyclase system from control and butyrate-treated cells. Butyrate treatment results in both an increased number of catecholamine receptors and an induction of a response to the hormone, as reported previously (Tallman, J.F., Smith, C.C., and Henneberry, R.C. (1977) Proc. Natl. Acad. Sci. U.S.A. 74, 873-877); in addition, we found that the same treatment reduces the degree of activation of adenylate cyclase by GTP. We have demonstrated in two cell types that this decrease in GTP activation is inversely related to the degree of induction of the hormone response. Furthermore, in plasma membranes isolated from butyrate-treated cells, the hormone receptor is sensitive to GTP; i.e. GTP reduces the affinity of isoproterenol for the receptor. We propose that these changes reflect an interaction between the beta-adrenergic receptor and the nucleotide regulatory component and that this interaction represents, at least in part, the process of coupling. Several possible mechanisms which can account for the change in GTP activation are discussed in terms of our current understanding of the regulation of the adenylate cyclase system.
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1144
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Lin M, Lin C, Whitlock J. Reduction of GTP activation of adenylate cyclase system by its coupling to hormone receptor. J Biol Chem 1979. [DOI: 10.1016/s0021-9258(17)30065-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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1145
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Lin C, Foester R, Lim J, Hsu T, Morton JB, Symchowicz S. Absorption, metabolism, and excretion of 14C-tosifen in the dog and rat. DRUG METABOLISM AND DISPOSITION: THE BIOLOGICAL FATE OF CHEMICALS 1978; 6:50-8. [PMID: 23274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
14C-tosifen [N-2-(1-phenylpropyl)-N'-p-tolyl sulfonylurea] was readily absorbed in both rats and dogs. The rates of absorption, metabolism, and urinary excretion were higher in the rat than in the dog. More of the drug was excreted via the feces than in the urine of the rat, whereas in the dog, the drug was primarily excreted into the urine. The parent drug was the major radioactive component in the plasma of both species. In the urine, however, only a negligible amount of tosifen was found. The major urinary metabolite was a hydroxymethyl derivative which accounted for about 60% and 40% of the total radioactivity in the urine of the dog and rat, respectively.
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1146
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Cohen LG, Lin C. Pulse delay measurements in the zero material dispersion wavelength region for optical fibers. APPLIED OPTICS 1977; 16:3136-3139. [PMID: 20174316 DOI: 10.1364/ao.16.003136] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Subnanosecond pulses in the 1120-1550-nm region are generated by multiple-order stimulated Raman scattering in a small core single-mode silica fiber pumped by a Q-switched and mode-locked Nd:YAG laser at 1064 nm. These near ir pulses are injected into various km long test fibers, and relative time delay changes between different wavelengths are used to determine dispersion in a region where fiber material dispersion is small. Zero material dispersion has been observed in germanium and boron-doped single-mode and multimode est fibers.
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1147
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Lin C, Stolen RH, Jain RK. Group velocity matching in optical fibers. OPTICS LETTERS 1977; 1:205. [PMID: 19680378 DOI: 10.1364/ol.1.000205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
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1148
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Lin C, Stolen RH, French WG, Malone TG. A cw tunable near-infrared (1.085-1.175-microm) Raman oscillator. OPTICS LETTERS 1977; 1:96-97. [PMID: 19680342 DOI: 10.1364/ol.1.000096] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This is the first report of a cw tunable Raman laser in the 1.1-microm region of the spectrum. A prism-tuned fiber Raman resonator with a 650-m-long, low-loss small-core single-mode silica fiber was pumped by a 5-W cw Nd:YAG laser at 1.064 microm. With two separate resonator mirrors for the first and the second Stokes oscillation, we have obtained first Stokes oscillation tunable from 1.085 to 1.13 microm and second Stokes oscillation tunable from 1.15 to 1.175 microm.
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1149
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Lin C, Li Y, McGlotten J, Morton JB, Symchowicz S. Isolation and identification of the major metabolite of albuterol in human urine. DRUG METABOLISM AND DISPOSITION: THE BIOLOGICAL FATE OF CHEMICALS 1977; 5:234-8. [PMID: 17520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The major urinary metabolite of albuterol in man was isolated and purified by ion-exchange chromatography and countercurrent distribution. On the basis of proton magnetic resonance, infrared, and mass-spectral analysis, enzymic hydrolysis, and assay of inorganic sulfate after acid hydrolysis, the metabolite has been identified as the 4'-O-sulfate ester of albuterol.
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1150
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Saldana LR, Schulman H, Lin C. Routine amnioscopy at term. Obstet Gynecol 1976; 47:521-4. [PMID: 944404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A controlled study for the management of antepartum meconium-stained amniotic fluid (MSAF) detected by amnioscopy performed in a total of 508 patients is presented. The incidence of antepartum MSAF was 2.2%, while intrapartum MSAF was found in 15% of cases. A significant incidence of depressed neonates was found in the latter group. Patients with antepartum MSAF had no perinatal losses, whether managed expectantly or by oxytocin induction. Immediate operative intervention (ie, cesarean section) is not warranted. Observations on FHR patterns, fetal pH, and Apgar scores of these patients are presented.
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