276
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Wang N, Yuan C, Lu Y, Yue J, Guo K. [Discussion on criteria for appraising the endanger threatening rare medicinal plants]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1992; 17:67-70, 125. [PMID: 1418527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
This paper deals with the criteria for appraising the endanger threatening rare medicinal plants. A preliminary evaluating method is presented.
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277
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Yuan C. Top-quark polarization at e-e+ colliders. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1992; 45:782-793. [PMID: 10014436 DOI: 10.1103/physrevd.45.782] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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278
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Yuan C, Wang N, Lu Y. [Imperativeness of strengthening conservation and management of resources of Chinese medicinal materials]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1992; 17:3-5, 62. [PMID: 1524662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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279
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Kim CS, Rosner JL, Yuan C. Erratum: Impact of new ||Vub/Vcb|| and epsilon '/ epsilon measurements on weak mixing angles. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1992; 45:389. [PMID: 10014225 DOI: 10.1103/physrevd.45.389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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280
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Kane GL, Ladinsky GA, Yuan C. Using the top quark for testing standard-model polarization and CP predictions. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1992; 45:124-141. [PMID: 10014197 DOI: 10.1103/physrevd.45.124] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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281
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Guo Y, Cha M, Chao A, Yuan C. [Determination of aucubin in Plantago asiatica L., P. major L. and P. depressa Willd. by HPLC]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1991; 16:743-4, 763. [PMID: 1811672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A HPLC method for the determination of aucubin in P. asiatica, P. major and P. depressa was established. The mobile phase is MeOH-H2O (17:83). Good in producibility and high in rate of recovery, this method provides an effective way for the study of Plantago.
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282
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Yuan C, Yuan TC. Leading electroweak radiative corrections to t-->W++b. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1991; 44:3603-3609. [PMID: 10013822 DOI: 10.1103/physrevd.44.3603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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283
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Zhang Y, Sha D, Sha M, Yuan C. [Determination of glaucocalyxin A in the leaves of Plectranthus japonicus (Burm.) Koidz. var. glaucocalyx (Maxim.) Koidz. by HPLC]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1991; 16:679-80, 704. [PMID: 1804175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
This paper reports the quantitative analysis of glaucocalyxin A in the leaves of Plectranthus japonicus var. glaucocalyx by HPLC. The chromatographic conditions were as follows: column: Shim-pack CLC-ODS; mobile phase: methanol-water (70:30). The average content of glaucocalyxin A in the leaves is 1.30%.
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284
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Zhao Y, Yuan C, Lu H. [Isolation and identification of 20(R)-ginsenoside-Rh2 (an anti-cancer constituent) from the fruits of Panax ginseng. C.A. Meyer]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1991; 16:678-9, 704. [PMID: 1804174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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285
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Chen R, Yuan C. [Experimental anti-arrhythmic effects of zhigancao (prepared licorice) injection]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1991; 16:617-9, inside back cover. [PMID: 1820795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Zhigancao injection can antagonise the arrhythmia induced by chloroform, adrenaline, aconitine, strophanthine K and barium chloride, slow the heart rate, prolong P-R and Q-T intervals and antagonise the positive chronotropic response induced by isoprenaline. The LD50 of zhigancao injection is 41.2g/kg in nice by intraperitoneal.
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286
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Zhao Y, Yuan C. [Chemical constituents of Acanthopanax giraldii Harms]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1991; 16:421-4, 448. [PMID: 1910506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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287
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Jia T, Yuan C, Cao K. [Determination of myristicin and safrol in the volatile oil of semen Myristicae and its processed products by TLC-scanning]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1991; 16:272-8, 317. [PMID: 1781891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
This paper reports the determination of myristicin and safrol in the volatile oil of Semen Myristicae and its processed products by TLC-Scanning. The results showed that in the processed products myristicin decreased markedly and safrol decreased slightly. The quantity of myristicin roasted with paste less than with wheat bran less than with talcum powder less than the unprocessed one. The toxicity of Semen Myristicae is related to the quantities of myristicin.
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288
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Chai CY, Lin AM, Su CK, Hu SR, Yuan C, Kao LS, Kuo JS, Goldstein DS. Sympathoadrenal excitation and inhibition by lower brainstem stimulation in cats. JOURNAL OF THE AUTONOMIC NERVOUS SYSTEM 1991; 33:35-46. [PMID: 1869769 DOI: 10.1016/0165-1838(91)90016-v] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Effects of stimulation of brainstem sites on hemodynamics and plasma catecholamine levels were assessed in cats under chloralose-urethane anesthesia. Pressor areas of the dorsal medulla (DM) and ventrolateral medulla (VLM) and the depressor area of the paramedian reticular nucleus (PRN) were stimulated electrically using a monopolar electrode, or chemically using sodium glutamate microinjection. Plasma levels of norepinephrine (NE) and epinephrine (EPI) were measured in caval blood above the adrenal veins. Electrical stimulation of the DM and VLM produced increases in blood pressure and in plasma NE and EPI levels that were enhanced after acute vagotomies. The NE and EPI responses were attenuated after acute, bilateral adrenalectomies, confirming augmented adrenomedullary secretion, whereas the pressor responses were intact. Injection of sodium glutamate into the same pressor regions of the DM or VLM also produced pressor responses and elevated plasma catecholamine levels, indicating that the responses resulted from activation of neuronal perikarya. Stimulation of the PRN attenuated pressor and catecholamine responses during stimulation of the DM and VLM. The results indicate that pressor responses during stimulation of the DM and VLM are due at least partly to activation of perikarya in these regions, are associated with but not dependent on adrenomedullary activation, and are enhanced after vagotomy; and that neurons of the PRN exert inhibitory modulation of the pressor and adrenomedullary responses during stimulation of VLM and DM.
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289
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Steffensen B, Brägger U, Yuan C, Pasquali LA, Brunsvold M, Kornman KS. Effect of region-of-interest in computerized densitometric analysis of radiographs. J Periodontal Res 1991; 26:107-13. [PMID: 1826524 DOI: 10.1111/j.1600-0765.1991.tb01633.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The region-of-interest (ROI) in computer-assisted densitometric image analysis (CADIA) is defined by its size and location. This study evaluated the effects of these variables on two quantitative parameters, the change in density and the area with change in density. Pairs of radiographs for these analyses were obtained from sites with "no change" or "known loss" in Cynomolgus monkeys during a study of ligature-induced periodontitis. The size and location of the ROI had clear effects on the two CADIA parameters. To reduce these effects, a corrective procedure hypothesizing a linear relationship between the ROI size and the area with change in density was tested. While this procedure was sufficient to correct for ROI size-dependent differences among "no change" images, it was not effective in images with "known loss". In such images, additional adjustments by increasing threshold levels for the registered change in density were found to reduce but not to eliminate differences between ROIs of different size and location. When densitometric radiographic analysis is used for quantitative comparison of different sites, it is primarily recommended to select ROIs of similar size and location. Application of corrective procedures should follow only after careful evaluation of their effects on sensitivity and specificity.
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290
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Yuan C, Penttilä KE, Alfthan G, Lindros KO. Role of selenium-dependent glutathione peroxidase in protecting against t-butyl hydroperoxide-induced damage in hepatocytes. PHARMACOLOGY & TOXICOLOGY 1991; 68:196-200. [PMID: 2057450 DOI: 10.1111/j.1600-0773.1991.tb01222.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The role of the selenoenzyme glutathione peroxidase (Se-GSHPx) in protecting against oxidative injury was studied in hepatocytes isolated from rats fed either a low-selenium (Se-) or a selenium-adequate (Se+, control) diet. In rats fed Se- diet for eight weeks the selenium content of plasma and liver was lowered to 15 and 8%, respectively. No Se-GSHPx and only 5% of total GSHPx activity was detected in Se- hepatocytes. However, the Se- hepatocytes were as resistant as the Se+ cells to oxidative injury by 0.8 mM tert-butyl hydroperoxide (t-BuOOH), or 0.2 mM t-BuOOH plus 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU), an inhibitor of oxidized glutathione (GSSG) reductase. Only at 1.5 mM t-BuOOH or at 0.5 mM t-BuOOH with BCNU were cell damage and lipid peroxidation more evident in Se- cells. At all t-BuOOH concentrations used the depletion of cellular glutathione (GSH) was similar in magnitude in Se- and Se+ cells, but Se+ cells released more glutathione (mainly GSSG), obviously due to their higher Se-GSHPx activity. These results suggest that hepatocytes devoid of Se-GSHPx activity maintain a high capacity to resist peroxidative attack, either via residual (non-Se)GSHPx activity or other compensatory GSH-associated detoxication mechanisms.
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291
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Ladinsky GA, Yuan C. W-boson-top-quark background to heavy-Higgs-boson production. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1991; 43:789-793. [PMID: 10013441 DOI: 10.1103/physrevd.43.789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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292
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Abstract
Multiple overlapping thin 3D slab acquisition is presented as a magnitude contrast (time of flight) technique which combines advantages from multiple thin slice 2D and direct 3D volume acquisitions to obtain high-resolution cross-sectional images of vessel detail. Details of implementation and example images are presented.
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293
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Kuebel D, Pundurs M, Yuan C, Berger EL, Paige FE. Comparison of bottom-quark production rates in ISAGET with a full QCD 2-->3 calculation. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1991; 43:767-778. [PMID: 10013439 DOI: 10.1103/physrevd.43.767] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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294
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Chakeres DW, Schmalbrock P, Brogan M, Yuan C, Cohen L. Normal venous anatomy of the brain: demonstration with gadopentetate dimeglumine in enhanced 3-D MR angiography. AJR Am J Roentgenol 1991; 156:161-72. [PMID: 1898554 DOI: 10.2214/ajr.156.1.1898554] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This investigation evaluates whether gadopentetate dimeglumine enhancement of three-dimensional (3-D) acquisition MR angiography can generate clinically useful images of the normal venous anatomy of the brain. 3-D MR angiography of normal cerebral arterial anatomy has made rapid progress, although demonstration of detailed venous anatomy with similar techniques has been much less revealing. To overcome the limitation of slow venous flow, IV gadopentetate dimeglumine contrast enhancement was used to alter the relaxation times of blood, thus augmenting the venous signal. Several groups of patients were evaluated: we studied eight patients both with and without contrast enhancement, 20 patients and volunteers with multiple techniques to determine optimal technical parameters, and seven patients in whom enhanced MR studies were compared with standard selective biplane cut-film arterial angiograms. Only the large dural sinuses (such as the transverse sinus) could be seen on unenhanced studies owing to the saturation of slowly flowing venous spins. With contrast enhancement, many of the important small and large cerebral venous structures were routinely seen with reasonable scanning times (7 min). The venous anatomy was well seen for approximately one-half hour after injection and correlated well with angiograms. There are several important limitations to this technique, including a limited field of view, variable visibility of specific veins owing to technical and physiologic factors, confusion of enhancing non-flow-related structures, and lack of detailed physiologic information. Single excitation 3-D MR angiograms are insensitive in the evaluation of cerebral venous structures. Enhancement with gadopentetate dimeglumine affords rapid scanning and excellent visualization of the pertinent venous anatomy. The best image quality was obtained with a sequence of 50/7/30 degrees (TR/TE/flip angle).
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295
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Huang M, Shan S, Yuan C, Li Y, Wang Q. Introduction of vanadium into Y zeolite by solid-state ion exchange. ACTA ACUST UNITED AC 1990. [DOI: 10.1016/0144-2449(90)90060-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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296
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Yuan C, Li L, Ding Z, Zhou Y. [A pharmacognostical study on the fruits of Cnidium monnieri (L.) Cuss]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1990; 15:649-52, 701. [PMID: 2282152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The fruits of three species are used as the Chinese drug "Shechuangzi", namely Cnidium monnieri, C. monnieri var. formosana and C. japonicum, among which only C. monnieri is the real sort. The authors have distinguished them by macroscopic and microscopic structures and TLC. The total coumarin, trace element and amino acid contents are reported.
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297
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Kauffman RP, Yuan C. Top-quark backgrounds to Higgs-boson decay to W+W-. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1990; 42:956-959. [PMID: 10012927 DOI: 10.1103/physrevd.42.956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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298
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Kim CS, Rosner JL, Yuan C. Impact of new ||Vub/Vcb|| and epsilon '/ epsilon measurements on weak mixing angles. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1990; 42:96-111. [PMID: 10012700 DOI: 10.1103/physrevd.42.96] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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299
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Schmalbrock P, Yuan C, Chakeres DW, Kohli J, Pelc NJ. Volume MR angiography: methods to achieve very short echo times. Radiology 1990; 175:861-5. [PMID: 2343137 DOI: 10.1148/radiology.175.3.2343137] [Citation(s) in RCA: 93] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Angiographic displays of cerebral vessels can be generated with single-excitation three-dimensional magnetic resonance imaging. Differentiation of true stenosis from artifactual signal loss, due to dephasing effects from fast or nonconstant blood flow and field inhomogeneities, poses a significant clinical problem that can be largely resolved with the use of very short echo times (TEs). A three-dimensional imaging technique was developed that allows TEs of 3.1 msec without and 4.5 msec with first-order flow compensation gradients. The short TEs were achieved with short asymmetric radio-frequency pulses, gradients of minimal duration, and fractional echoes. Significantly improved images of normal tortuous vessels with fast flow were obtained. With this method, accuracy in depicting the vessel lumen and confidence in the findings were markedly increased.
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300
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Yuan C. [Nursing care of transplantation of fetal nigra, adrenal medullary tissue for parkinsonism]. ZHONGHUA HU LI ZA ZHI = CHINESE JOURNAL OF NURSING 1990; 25:123-4. [PMID: 2322965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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