601
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Yu Q, Li S, Chen H, Ye T, Ao J. Development of the scale of quality of life for diseases with visual impairment. YAN KE XUE BAO = EYE SCIENCE 1996; 12:36-9. [PMID: 9275735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
PURPOSE To describe the development of the of scale quality of life which can measure the quality of life of Chinese patients with visual impairment. METHODS Based on a thorough literature search and consultation with ophthalmologists and public health professionals, 20 items were selected to create a scale. Fifty-seven cataract patients with vision impairment and 60 glaucoma patients with vision impairment and visual field loss were measured by the scale to evaluate the validity, reliability and responsiveness of the scale. RESULTS The scale covered four domains of the quality of life (QOL). The criterion related validity of the scale: r = 0.6865 (P = 0.001). The test-retest reliability of the scale: r = 0.8959 (P = 0.001). Coronback's alpha was 0.9359. The variance ratio (VR) of intra-individual variance to inter-individual variance was 0.0551 for overall scores. The correlation coefficient of split-half method was 0.9553. The responsiveness: T-test, T = 5.95 (P = 0.001), effect size statistic was 1.533. CONCLUSIONS The result demonstrates that the scale has a satisfactory validity, reliability and responsiveness. It suggests that the scale can be applied to clinical trials.
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602
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Qin Y, Zou Y, Yu Q, Liang M, Liu H, Rao G, Li Z, Li K. [Determination of metronidazole in serum by HPLC]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1996; 27:114-6. [PMID: 9208636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
This paper report a sensitive and rapid method for the determination of metronidazole (MTZ) using theophylline as the internal standard. High performance liquid chromatograph model 344 (Beckman) with a 254 nm wavelength UV detector and YWG-C18H37 column (10 microns, 250 x 4.6 mm) was used. To the serum sample 200 microliters, 100 microliters phosphate buffer (0.8 mol/L, pH 7.5) was added, then extracted with 3 ml chloroform containing 5% isopropyl alcohol. The organic layer was removed and evaporated to dryness under an air stream in a 40 degrees C water bath. The residue was dissolved in 30 microliters mobile phase and 20 microliters injected. The mobile phase of water-methanol (73:27) was pumped at 1.0 ml/min through the column. The detector operated at 0.005 aufs. The retention times for MTZ and theophylline were 5.78 and 6.81 min respectively. Standard curve was linear in the concentration range of 0.3125 to 20 mg/L. The detection limit in serum was 0.02 mg/L. Extraction recovery was 77%-82%; method recovery 99%-102%; withinday RSD less than 3.0%; inter-day RSD less than 3.5%.
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603
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Lin B, Yu Q, Ma Y. Capillary electrophoresis in China. JOURNAL OF CAPILLARY ELECTROPHORESIS 1996; 3:69-75. [PMID: 9384753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The application of capillary electrophoresis (CE) to many fields and the development of relevant CE techniques in China are presented, based mainly on the contents of the two national symposia on CE, which were held in 1993 and 1995 separately with a total of about 200 papers presented. The technique has been involved in the widespread fields of industry, agriculture, medicine, environmental sciences, etc. The method and technique development involves all aspects including columns, detectors, and whole machines.
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604
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Wang X, Zhu S, Liu Q, Hu A, Zan Z, Yu Q, Yin Q. Field evaluation of the QBC technique for rapid diagnosis of vivax malaria. Bull World Health Organ 1996; 74:599-603. [PMID: 9060220 PMCID: PMC2486804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The QBC (quantitative buffy coat) technique was compared with that of the Giemsa-stained thick blood film (GTF) under field conditions in Junlian and Mingshan counties, Sichuan, China, for rapid diagnosis of vivax malaria. Blood samples were collected from 364 volunteer villagers, and each sample was examined with both the QBC and GTF techniques. For each GTF sample (10 microliters of blood), as many as 300 oil-immersion fields were examined; each QBC tube was inspected for up to 5 minutes. The GTF technique resulted in 86 positive blood samples and 278 negative; the QBC technique indicated 89 positive and 275 negative samples. Relative to the results obtained with GTF, the QBC technique had a sensitivity and specificity of 87.2% and 95.0%, respectively; concordance between the tests was 93.1%. The median time-to-positive diagnosis with the QBC technique (1.12 min) was 11% of that with GTF. The distribution of different developmental stages of Plasmodium vivax parasites was also examined in the centrifuged QBC tubes: all stages except schizonts could be found in the lower part of the platelet zone (the interphase between the monocyte and platelet layers), especially ring forms.
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605
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Yu Q, Xu J, Zhu S, Liu Q. [A role of oblique flashlight test in screening for primary angle closure glaucoma]. YAN KE XUE BAO = EYE SCIENCE 1995; 11:177-9. [PMID: 9275738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
PURPOSE To study the effect of oblique flashlight test in screening for primary angle closure glaucoma. METHOD Two hundred adults over 50 years old were sampled randomly at Doumen county of Guangdong province in 1995. 390 eyes were measured by oblique flashlight test according to grading standard photos of oblique flashlight test. Other ocular examinations consisted of intraocular-pressure measurement with Schiotz tonometer, gonioscopy, and optic disc appearance. RESULTS The result showed 25.2% of the examined eyes had the oblique flashlight grade < or = 2, and tended to be increasing with age (x2 = 8.597, P < 0.05) and in females (x2 = 14.89, P < 0.01). Based on temporal anterior chamber angle < or = 2 (Shaffer's grade), the obligue flashlight grade < or = 2 found that occludable angle sensitivity was 91.7%, specificity was 91.5%, and 8.16% of the eyes had primary closure angle glaucoma. No patient was found in oblique flashlight grades > or = 3. CONCLUSION This study shows that oblique flashlight test conforms to screening test needs, and plays an important role in screening for primary closure angle glaucoma. We suggest that oblique flashlight grades < or = 2 as cutoff point of screening for occludable angle.
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606
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Zhou G, Yu Q, Ma Y, Xue J, Zhang Y, Lin B. Determination of polyamines in serum by high-performance capillary zone electrophoresis with indirect ultraviolet detection. J Chromatogr A 1995; 717:345-9. [PMID: 8520683 DOI: 10.1016/0021-9673(95)00821-1] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A method for determining polyamines in serum by capillary zone electrophoresis (CZE) with indirect ultraviolet detection was established. The concentrations of polyamines in the sera of six healthy adults were determined and the results were in accordance with those obtained previously by high-performance liquid chromatography (HPLC). However, the CZE method is superior to HPLC in that it has high sensitivity, small sample consumption and easy sample pretreatment.
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607
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Guan H, Yu Q. [Development and current status of dental implantation abroad]. ZHONGHUA KOU QIANG YI XUE ZA ZHI = ZHONGHUA KOUQIANG YIXUE ZAZHI = CHINESE JOURNAL OF STOMATOLOGY 1995; 30:310-3. [PMID: 8728977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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608
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Katsura H, Williams MC, Brody JS, Yu Q. Two closely related receptor-type tyrosine phosphatases are differentially expressed during rat lung development. Dev Dyn 1995; 204:89-97. [PMID: 8563029 DOI: 10.1002/aja.1002040111] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Transmembrane protein tyrosine phosphatases (PTPases) comprise a newly identified class of receptor-like molecules. In most cases their ligands and the substrates they dephosphorylate are not known. In order to begin to explore the functions of the PTPases in cell physiology and in mammalian development, we examined the expression patterns of two closely related receptor-type tyrosine phosphatase genes, namely LAR and PTP delta, in fetal rat lung and in selected adult rat tissues. In the lung, in situ hybridization and immunohistochemistry show that the LAR mRNA and protein are expressed exclusively in the epithelium. In the early embryonic or fetal lung (day 13 to 18) LAR is expressed by all of the epithelial cells of the forming bronchial tree. This widespread pattern of expression is lost later in fetal life (day 21) as the lung matures and acquires the morphologic and biochemical features of the adult organ. LAR gene expression is then confined to two epithelial progenitor cells of the distal airways, namely the bronchiolar Clara cell and the alveolar type II cell. The LAR gene products were also found abundantly expressed in epithelial progenitor cells of adult esophagus, skin, and small intestine, all of which are continuously renewing epithelia. The rat PTP delta gene, on the other hand, is specifically expressed in the mesenchyme of the developing lung. The level of the PTP delta mRNA decreases as the lung matures. These results suggest that the two closely related receptor-type tyrosine phosphatases are differentially expressed in a tissue-specific fashion. They are expressed mostly in proliferating cells or in cells which have potential to proliferate.(ABSTRACT TRUNCATED AT 250 WORDS)
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609
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Grammatikakis N, Grammatikakis A, Yoneda M, Yu Q, Banerjee SD, Toole BP. A novel glycosaminoglycan-binding protein is the vertebrate homologue of the cell cycle control protein, Cdc37. J Biol Chem 1995; 270:16198-205. [PMID: 7608185 DOI: 10.1074/jbc.270.27.16198] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Using a monoclonal antibody, IVd4, that recognizes a novel group of hyaluronan-binding proteins, we have immunoscreened a cDNA library constructed from embryonic chick heart muscle mRNA. One of the cDNAs isolated from the library encodes a 29.3-kDa protein homologous to Cdc37, an essential cell cycle regulatory factor previously characterized genetically in yeast and Drosophila; this is the first vertebrate CDC37 gene to be cloned to date. We also present evidence for the existence of a second chick isoform that is identical to the 29.3-kDa protein over the first 175 amino acids but is entirely different at the carboxyl terminus and lacks the IVd4 epitope. The avian Cdc37 binds hyaluronan, chondroitin sulfate and heparin in vitro, and both isoforms contain glycosaminoglycan-binding motifs previously described in several hyaluronan-binding proteins. These findings suggest a role for glycosaminoglycans in cell division control.
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610
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Cohen MI, Yu Q, Huang WX. Preferential correlations of a medullary neuron's activity to different sympathetic outflows as revealed by partial coherence analysis. J Neurophysiol 1995; 74:474-8. [PMID: 7472350 DOI: 10.1152/jn.1995.74.1.474] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
1. In vagotomized, paralyzed, decerebrate cats, simultaneous recordings were taken from one or more sympathetic nerves [cervical sympathetic (CS), inferior cardiac (IC), splanchnic (SP)] and from medullary neurons in vasomotor-related regions. Coherence analyses were used to ascertain the presence of sympathetic rhythms (2-6 Hz or "3-Hz rhythm," 7-13 Hz or "10-Hz rhythm") that were correlated between different signals. The occurrence of a significant peak at such a frequency in a unit-nerve coherence spectrum allowed the identification of a medullary neuron as sympathetic related. 2. A serendipitous example is given of a rostral ventrolateral medullary neuron that had significant unit-nerve 10-Hz coherence peaks for three sympathetic nerves (CS, IC, SP); but, as revealed by partial coherence analysis, the unit activity's correlation with one nerve's activity could be partially or completely dependent on its correlation with other nerve activities. Thus in this case the unit-CS and unit-IC coherences at 10 Hz were completely dependent on the SP rhythm, whereas the unit-SP coherence was not significantly affected by the CS and IC rhythms. This asymmetry suggests that the neuron was preferentially connected to SP-generating medullary circuits. 3. This example indicates the strength of partial coherence analysis as a means of studying differential connectivity between medullary sympathetic-related neurons and sympathetic output neuron populations.
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611
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Yu Q, Toole BP. Biotinylated hyaluronan as a probe for detection of binding proteins in cells and tissues. Biotechniques 1995; 19:122-4, 126-9. [PMID: 7545407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
A convenient and reliable method for preparing and using biotinylated hyaluronan for detection of hyaluronan-binding proteins is described. The biotinylated hyaluronan can be used to detect binding proteins in transblots after electrophoresis or as a histological probe for localization of binding proteins in cultured cells and tissue sections.
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612
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Yu Q, Lou JP, Wang PZ, Shi HM, Sun DX. [The normal CT features of the pterygopalatine space.]. SHANGHAI KOU QIANG YI XUE = SHANGHAI JOURNAL OF STOMATOLOGY 1995; 4:103-4. [PMID: 16538340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
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613
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Yu Q, Li S, Ye T. [The study of grading standard photos of oblique flashlight test]. YAN KE XUE BAO = EYE SCIENCE 1995; 11:80-5. [PMID: 9208658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
PURPOSE We try to establish a convenient, fast, inexpensive and accurate screening test and to make a grading standard. METHODS 1. In 120 eyes, we measured axial anterior chamber depth (AACD), peripheral anterior chamber depth (PACD), antrior chamber angle (ACA) and took iris pictures under slitlamp microscope imitating the oblique flashlight test. The clear photos from 107 eyes were measured by computerized image analysis to determin the ratio of the width of nasal iris and nasal iris light band (ILBR). Then the linear correlation of ILBR with AACD, PACD and ACA was analyzed statistically. The ILBR was graded according to the analytic results. RESULTS 1. Relationship of ILBR with PACD, AACD and ACA: the linear correlation analysis showed a positive correlation relationship among ILBR, PACD and AACD (r = 0.9451, P = 0.0001 and r = 0.8725, P = 0.0001), and showed a negative correlation relationship between ILBR and ACA (r = -0.7582, P = 0.0001). 2. ILBR grading standards: grade 1. ILBR < or = 1/5, the gonioscopy usually demonstrates a dangerously narrowed angle (N3-4); grade 2, ILBR > 1/5- < or = 1/4, the gonioscopy will always show a capable of closure angle (N2-3); grade 3, ILBR > 1/4- < or = 1/3, that angle is incapable of closure (N1-2); grade 4, ILBR > 1/3- < or = 1/2, the most angles show wide (W-N1); grade 5, ILBR > 1/2, the gonioscopy shows all wide angle. The linear correlation analysis also showed correlation relationship among ILBR grades PACD, AACD and ACA. CONCLUSION Through arational ILBR grades and a set of grading standard photos, it is found that the test is not only convenient, fast, and inexpensive, but also accurate as well. The test not only plays an important role in PACG screening, but also may be applied widely to estimate shallow AACD and narrow angle in the clinic.
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614
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Ling R, Davis PJ, Yu Q, Wood CM, Pringle CR, Cavanagh D, Easton AJ. Sequence and in vitro expression of the phosphoprotein gene of avian pneumovirus. Virus Res 1995; 36:247-57. [PMID: 7653102 PMCID: PMC7133856 DOI: 10.1016/0168-1702(95)00008-e] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The phosphoprotein (P) gene of two subgroup A strains of avian pneumovirus comprised 855 nucleotides containing only one substantial open reading frame encoding a protein of 278 amino acids, with a predicted M(r) of 30,323. In vitro translation of P mRNA in a wheat germ system resulted in the synthesis of two polypeptides of M(r) 35,000. Comparison of the deduced P protein sequence with that of the known mammalian pneumoviruses revealed overall amino acid identities ranging from 31 to 34.5%, suggesting a distant relationship. However, there was a much higher identity (63.2-68.4%) in a region of 57 residues, which included a heptad repeat sequence.
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615
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616
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Yu Q, Hardy RW, Wertz GW. Functional cDNA clones of the human respiratory syncytial (RS) virus N, P, and L proteins support replication of RS virus genomic RNA analogs and define minimal trans-acting requirements for RNA replication. J Virol 1995; 69:2412-9. [PMID: 7884888 PMCID: PMC188915 DOI: 10.1128/jvi.69.4.2412-2419.1995] [Citation(s) in RCA: 123] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The RNA-dependent RNA polymerase of human respiratory syncytial (RS) virus was expressed in a functional form from a cDNA clone. Coexpression of the viral polymerase (L) protein, phosphoprotein (P), and nucleocapsid (N) protein allowed us to develop a system for expression and recovery of replicable RS virus RNA entirely from cDNA clones. cDNA clones of the N, P, and L genes were constructed in pGEM-based expression plasmids and shown to direct expression of the appropriate polypeptides. Two types of RS virus genomic RNA analogs were expressed from an intracellular transcription plasmid that directed the synthesis of RNAs with defined 5' and 3' ends. One analog included the authentic 5' and 3' termini of the genome, and the second contained the authentic 5' terminus and its complement at the 3' terminus as found in copyback defective interfering RNAs of other negative-strand RNA viruses. Both types of genomic analogs were encapsidated and replicated in cells expressing the RS virus N, P, and L proteins. Omission of any of the three viral proteins abrogated replication, thereby defining the N, P, and L proteins as the minimal trans-acting proteins required for RNA replication. This system has the advantages that expression occurs at a level sufficient to allow direct biochemical analysis of the products of RNA replication and that neither the use of reporter genes nor wild-type RS helper virus is required. These features allow analysis of both cis- and trans-acting factors involved in the control of replication of RS virus RNA.
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617
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Fine A, Panchenko MP, Smith BD, Yu Q, Goldstein RH. Discordant regulation of transforming growth factor-beta receptors by prostaglandin E2. BIOCHIMICA ET BIOPHYSICA ACTA 1995; 1261:19-24. [PMID: 7893757 DOI: 10.1016/0167-4781(94)00210-t] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The effect of PGE2 on TGF-beta receptor binding was assessed for both signaling (type I and type II) and non-signaling (type III) TGF-beta receptors. We found in cross-linking studies that PGE2 treatment (24 h) decreased binding of TGF-beta to the type I and type II receptors by approx. 50% and markedly increased binding of TGF-beta to type III receptors nearly 10-fold. Northern analyses indicated that PGE2 decreased type I receptor mRNA levels by approximately 30-50%, decreased type II receptor mRNA levels by approximately 60%, and markedly increased type III receptor mRNA levels. Coincubation with cycloheximide partially blocked the PGE2-induced inhibition of type II receptor mRNA. In contrast, cycloheximide minimally affected PGE2-induced type III receptor mRNA levels. Activation of protein kinase C by phorbol esters had no apparent effect on TGF-beta receptor mRNA levels. Our data suggest that alterations in TGF-beta receptor expression could modify the response of tissues to TGF-beta during injury.
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618
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Yu Q, Xu J, Zhu S, Liu Q. Epidemiological survey of primary angle-closure glaucoma in Doumen. YAN KE XUE BAO = EYE SCIENCE 1995; 11:5-8. [PMID: 8575608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
PURPOSE To determine the prevalence of primary angle-closure glaucoma (PACG) in Doumen Countty, Guangdong province. METHODS Four villages from eight districts in doumen were selected by stratified, cluster and random sampling. Of a total of 1055 people aged 45 years or over, 932 (88.62%) were examined. The examination and diagnostic criterion were similar to those of shunyi survey. RESULTS The prevalence of PACG in subjects over 45 year of eye is 0.64%, in those over 50 years of age is 0.85% in Doumen, which is significantly lower than the corresponding figure of 1.99% in shunyi (P < 0.05). CONCLUSION This study identifies the prevalence of PACG in Doumen is lower than in Shunyi.
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619
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Yu Q, Xu J, Zhu S. [An epidemiological survey of primary angle-closure glaucoma in Doumen county Guangdong]. [ZHONGHUA YAN KE ZA ZHI] CHINESE JOURNAL OF OPHTHALMOLOGY 1995; 31:118-21. [PMID: 7656719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A comparison between the results of an epidemiological study of primary angle-closure glaucoma (PACG) in Doumen County, Guangdong in 1990 and those of a similar study in Shunyi County, Beijing in 1985 was reported. The prevalence of PACG in subjects over 45 years old was 0.64% and that, over 50 years, 0.85% in Doumen, while that, over 50 years, 1.99% in Shunyi (P < 0.05). There was significant difference in the prevalence of PACG between the two counties and the difference was discussed.
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620
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Sun DX, Luo JC, Liu DH, Yu Q, Sun MH, Wang WD. Computed tomography of pulmonary metastases from oral and maxillofacial tumors. ORAL SURGERY, ORAL MEDICINE, ORAL PATHOLOGY, ORAL RADIOLOGY, AND ENDODONTICS 1995; 79:255-61. [PMID: 7614192 DOI: 10.1016/s1079-2104(05)80293-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Computed tomographic scans were done on 14 oral and maxillofacial malignant tumors in which pulmonary metastases occurred but were poorly delineated by conventional chest radiography and tomography. Computed tomography promotes the accurate diagnosis of small and occult pulmonary metastases. Optimal nonlinear computed tomographic windows are recommended for the diagnosis of pulmonary metastases.
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621
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Yu Q, Wang PZ, Shi HM, Wang L, Sun DX. Radiographic findings in Langerhans' cell disease affecting the mandible. ORAL SURGERY, ORAL MEDICINE, ORAL PATHOLOGY, ORAL RADIOLOGY, AND ENDODONTICS 1995; 79:251-4. [PMID: 7614191 DOI: 10.1016/s1079-2104(05)80292-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The radiographic features of histopathologically diagnosed mandibular Langerhans' cell disease are described for 29 cases of the condition. We divided the patients into two groups: adults (age 27 to 60 years) and juveniles (age 1.5 to 15 years). A characteristic sign in juveniles was an osteolytic lesion with an uneven margin and either a continuous or discontinuous periosteal reaction. Because of the wide variability in radiographic presentation in adults, it was very difficult to differentiate this from other lesions in adults on the basis of radiologic criteria.
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622
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Abstract
Feline calicivirus (FCV) F9 strain was propagated in Crandall-Reese feline kidney cells. Two density populations of viral particles were observed after equilibrium centrifugation in an isopyknic CsCl gradient. The buoyant density of the heavy particle (PH) is 1.33 g/ml. The light particle (PL), a previously undescribed form of feline calicivirus, has a buoyant density of 1.22 g/ml. The PH and PL presented a similar morphology by electron microscopy. Western blot showed that both PH and PL contained a major polypeptide of the typical FCV capsid protein with a molecular weight of 62,000. Infectivity assay and RNA isolation demonstrated that PH is the intact infectious virion while PL is FCV empty capsid.
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623
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Lu D, Zhau P, Yu Q, Zhang C. Airway provocation test with ragweed pollen extract in Chinese asthmatics. Asian Pac J Allergy Immunol 1994; 12:125-9. [PMID: 7612105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
As ragweed becomes widespread over China, ragweed pollenosis tends to be more frequent. Incidence of ragweed pollenosis is about 1.04% in Qingdao district. To elucidate ragweed as an allergen in the development of bronchial asthma, ragweed pollen extract inhalation airway provocation tests (APT) were studied in 55 patients with ragweed pollenosis. A single dosage of 9,000 PNU ragweed pollen extract was applied and positive response was defined as more than 35% fall in SGrs at the dose of PT35-Grs. Among 55 patients, positive APTs were found in 27 cases (49%), dual late-phase responses in 11 patients, single late-phase responses in 2 patients in the complicated asthma group. Late-phase responses were related to the increased specific IgE and strong positive skin test response (wheal > 11 mm). The results suggested ragweed pollen was one of the important allergens causing bronchial asthma. There was airway hyperresponsiveness to ragweed pollen in some patients (20%) with ragweed pollenosis without asthmatic symptoms.
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624
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Hung SH, Yu Q, Gray DM, Ratliff RL. Evidence from CD spectra that d(purine).r(pyrimidine) and r(purine).d(pyrimidine) hybrids are in different structural classes. Nucleic Acids Res 1994; 22:4326-34. [PMID: 7937162 PMCID: PMC331958 DOI: 10.1093/nar/22.20.4326] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
CD spectra and difference CD spectra of four d(oligopurine).r(oligopyrimidine) and four r(oligopurine).d(oligopyrimidine) hybrid duplexes containing mixed A.T(U) and G.C base pairs were compared with the spectra of four DNA.DNA and four RNA.RNA oligomer duplexes of similar repeating sequences. The 16 duplexes were formed by mixing oligomers that were 24 nucleotides long. The buffer was 0.05 M Na+ (phosphate), pH 7.0. DNA.DNA and RNA.RNA oligomer duplexes were used as reference B-form and A-form structures. We found that the CD spectra of d(purine).r(pyrimidine) and r(purine).d(pyrimidine) hybrid duplexes were different from the CD spectra of either DNA.DNA or RNA.RNA duplexes. The data suggested that these hybrids have intermediate structures between A-form RNA and B-form DNA structures. The CD spectra of d(purine).r(pyrimidine) and r(purine).d(pyrimidine) hybrid duplexes were different from each other, but the hybrids in each class had consistent CD spectra as indicated by nearest-neighbor comparisons. Thus, it appeared that the two types of hybrids belonged to different structural classes. The negative 210 nm band found in difference CD spectra was correlated with the presence of an r(purine) strand in the hybrid duplexes. The melting temperatures (Tm values) of these hybrids were compared with the Tm values of the DNA.DNA and RNA.RNA duplexes. The order of the thermal stability was: RNA.RNA duplex > r(purine).d(pyrimidine) hybrid > DNA.DNA duplex > d(purine).r(pyrimidine) hybrid, when comparing analogous sequences.
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625
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Yu Q, Andresen K. Fringe-orientation maps and fringe skeleton extraction by the two-dimensional derivative-sign binary-fringe method. APPLIED OPTICS 1994; 33:6873-6878. [PMID: 20941234 DOI: 10.1364/ao.33.006873] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The fringe-orientation information of an interferometric fringe pattern is provided in the form of a fringe-orientation map by spin filtering. The fringe-orientation information is an important feature of fringe patterns and is helpful in many fringe-pattern processing algorithms. With the help of a fringe-orientation map the two-dimensional derivative-sign binary-fringe method is developed to extract fringe skeletons from a fringe pattern with an arbitrary fringe distribution. This fringe skeleton extraction method does not require thresholds and a thinning process. It is relatively robust and highly accurate.
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626
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Zhu SP, Xu JJ, Yu Q. [An epidemiologic survey of blindness and low vision in persons over 45 years old in Doumen County]. [ZHONGHUA YAN KE ZA ZHI] CHINESE JOURNAL OF OPHTHALMOLOGY 1994; 30:386-8. [PMID: 7805547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
An epidemiologic survey of blindness and low vision in persons over 45 years old in Doumen County, Guangdong Province was carried out in 1991. The sample size was 932 subjects. We found that the impairment of vision < 0.3 accounted for 10.94%. The prevalences of bilateral blindness and low vision were 1.61% and 3.22%, respectively. Both the prevalences of blindness and low vision were increased with age. The leading cause of blindness was cataract (45.20%) and the second, corneal opacity (16.70%).
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627
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Roboz J, Yu Q, Meng A, van Soest R. On-line buffer removal and fraction selection in gradient capillary high-performance liquid chromatography prior to electrospray mass spectrometry of peptides and proteins. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 1994; 8:621-626. [PMID: 7524805 DOI: 10.1002/rcm.1290080810] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The technique for on-line removal of buffers and for fraction selection to eliminate source clogging and suppression of electrospray ionization by unwanted constituents consisted of: (i) selecting the initial mobile phase composition to retain analytes on top of a capillary high-performance liquid chromatography (HPLC) column; (ii) washing the buffer isocratically to waste, using a two-way micro dump valve; (iii) starting the gradient and switching the dump valve to introduce analytes into the source. Peptide and protein mixtures were prepared in 0.05-0.5 M phosphate and 0.55 mM tris-based buffers, and water. After buffer removal, chromatograms and electrospray spectra were indistinguishable from those of aqueous controls, down to 1 pmol (acidic fibroblast growth factor) consumed, and up to 78 kDa (bovine transferrin) molecular weight. Aided by the dump valve, 100 fmol of angiotensin could be fractionated and identified on the slope of a 10 x 10(6) fmol of leucine enkephalin HPLC peak. On-line buffer removal and fraction selection eliminate the need for additional preparation steps than can lead to excessive sample losses.
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628
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Sun DX, Shi HM, Yu Q. [The diagnostic value of computed coronal tomography in maxillofacial tumors]. ZHONGHUA KOU QIANG YI XUE ZA ZHI = ZHONGHUA KOUQIANG YIXUE ZAZHI = CHINESE JOURNAL OF STOMATOLOGY 1994; 29:195-7, 254. [PMID: 7859565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
CT images in both transverse axial and coronal planes of 52 cases of maxillofacial tumors were analyzed. The authors emphasized that coronal technique should not be neglected, especially when the tumor was near the base of the skull, the sphenoid sinus and the hard palate. Transverse axial scan alone could not demonstrate the exact extent of invasion and the adjacent relationship. Coronal scan affords exceptional visualization. In such conditions, the combination of scans in two planes is the most helpful in delineating such lesions. It provides important information for determining surgical or radiotherapeutic approaches.
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629
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Yu Q, Liu X, Andresen K. New spin filters for interferometric fringe patterns and grating patterns. APPLIED OPTICS 1994; 33:3705-3711. [PMID: 20885762 DOI: 10.1364/ao.33.003705] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The basic spin filter for interferometric fringe patterns is improved and developed into several new versions for different applications. These spin filters can filter off random noise efficiently and have almost no blurring effect and phase distortion for the fringe patterns. First, they find the local fringe tangent direction, and then they apply a one-dimensional low-pass filter on this direction. In this way the spin filters can separate easily and clearly high-frequency noise from a real fringe signal with nearly zero frequency. The new spin filters are suitable not only for various fringe patterns but also for wrapped-phase, line-grating, and cross-grating patterns, which are impossible by common filters.
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630
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Li XC, Ogasa N, Yu Q, Quan D, Jevnikar A, Zhong R, Grant D. Lipopolysaccharide alters intestinal epithelial cell gene expression of regulatory cytokines and intercellular adhesion molecules. Transplant Proc 1994; 26:1531. [PMID: 7913265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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631
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Li XC, Yu Q, Zhu LF, Zhong R, Grant DR. Role of macrophages in intestinal epithelial cell-induced immune responses. Transplant Proc 1994; 26:1571. [PMID: 8030040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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632
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Xu JJ, Yu Q, Zhu SP. [An epidemiologic survey on lens opacities in Doumen County]. [ZHONGHUA YAN KE ZA ZHI] CHINESE JOURNAL OF OPHTHALMOLOGY 1994; 30:225-7. [PMID: 7843008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Age-related lens opacity is the main cause of vision disability in elderly all over the world. A longitudinal study was designed to investigate the prevalence of lens opacity. 1,817 eyes of 932 adults over 45 year-old were sampled randomly. The lens opacities were graded according to a standardized photo of the Lens Opacities Classification System II (LOCS-II). The prevalence of lens opacities in nuclear color, nuclear opacity, cortical opacity and subcapsular opacity was 16.1%, 28.6%, 30.3% and 8.7% respectively. The frequency of all four types of opacities increased with age. The prevalence of lens opacities in four types were higher in female than that in male. The color of nuclear was related to the degree of myopia, the deeper the higher. These results are important information in eye care project.
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633
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Yu Q, Fan C. [Taxonomy of 1043 strain producing actinospectacin]. WEI SHENG WU XUE BAO = ACTA MICROBIOLOGICA SINICA 1994; 34:160-163. [PMID: 8073763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Streptomyces strain 1043 was isolated from a soil sample collected in Hangzhou. The strain may produce two antibiotics--Actinospectacin and Streptovaricin. Its aerial mycelia are apricot orange to carnelian red on most media. An outstanding characteristic of 1043 strain is the development of pigment granules in both vegetative and aerial mycelia. Its culture and physiological characteristicus were found to resemble those of Streptomyces spectabilis. Streptomyces strain 1043 was named Streptomyces spectabilis 1043.
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634
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Liu ZG, Chen WF, Cao LX, Pang XW, Zhang PX, Yu Q. [Cytokine production by MTSC 4 cells, an established mouse thymic dendritic cell line]. SHI YAN SHENG WU XUE BAO 1994; 27:91-101. [PMID: 7518991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The cytokine production by MTSC 4 cells, a murine thymic dendritic cell line established in our laboratory, has been investigated. Without exogenous stimulation, the MTSC 4 cells constitutively produce multiple types of cytokines, including IL-1, IL-6, IL-7, CSF, IFN and Chemotactic factor (CF). Of which, IL-6 and IFN were abundant: IL-1 and Chemokine, moderate: IL-7 and CSF at low level. MTSC4 cells could not produce detectable either IL-3 of TNF alpha. The establishment of MTSC 4 may be useful in the analysis of the mechanism of thymus selection, and in the study of the network regulation of autocrined cytokines.
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635
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Masuda T, Ogawa H, Miyao Y, Yu Q, Misumi I, Sakamoto T, Okubo H, Okumura K, Yasue H. Circadian variation in fibrinolytic activity in patients with variant angina. BRITISH HEART JOURNAL 1994; 71:156-61. [PMID: 8130024 PMCID: PMC483636 DOI: 10.1136/hrt.71.2.156] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
BACKGROUND Coronary artery spasm induces activation of the coagulation system. Turnover and maintenance of thrombus depend not only on formation but also on lysis. The relation between coronary spasm and fibrinolytic system has not been elucidated. OBJECTIVE To examine whether there is impairment of or a circadian variation in fibrinolytic activity in patients with variant angina. METHODS Plasminogen activator inhibitor (PAI) activity and concentrations of tissue plasminogen activator (t-PA) antigen were measured in venous plasma samples taken at 2200, 0600, and 1400 and 24 h Holter tapes were recorded in 15 patients with variant angina, 12 patients with stable exertional angina, and 12 controls. RESULTS There were significant circadian variations in PAI activity and t-PA antigen with peak values at 0600 in all three groups. Mean (SEM) PAI activity (IU/ml) at 2200, 0600, and 1400 was 6.1 (1.1), 11.0 (1.3), and 4.4 (0.6) in the variant angina group; 1.8 (0.7), 5.6 (1.1), and 1.2 (0.3) in the stable exertional angina group; and 1.1 (0.5), 4.5 (0.8), and 0.7 (0.3) in the control group. Furthermore, both plasma PAI activity and t-PA antigen concentrations were significantly higher in the variant angina group than in the stable exertional angina group and the control group at each sampling time. CONCLUSIONS In patients with variant angina there was a circadian variation in fibrinolytic activity, which was lowest in the early morning, and impaired fibrinolytic activity particularly in the early morning, when attacks of angina occur most frequently.
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636
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Yu Q, Wang PZ, Shi HM, Sun DX. [Radiologic similarity and dissimilarity of Histiocytosis X in the mandible between non adult and adult]. SHANGHAI KOU QIANG YI XUE = SHANGHAI JOURNAL OF STOMATOLOGY 1993; 2:190-2. [PMID: 15159798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
28 cases of Histiocytosis X in the mandible were divided into two groups:the non adult group (19 cases,21 foci).and the adult group(9 cases,12 foci).their similarity and dissimilarity in radiological appearances were contrasted individually.The authors consider there were different roentgenographic manifestations between the two groups according to the diversity of physilological and morphological configuration in the mandible.The former group which had its characteristic roentgenologic feature displayed a radiolucent region with an irregular margin mostly accompanied with a periosteal reaction at the inferior and lateral surfaces of the mandible.Owing to lacking above mentioned demonstration,it was difficult to distinguish the lesions of later group from other disease in the mandible.
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637
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Seppälä H, Nissinen A, Yu Q, Huovinen P. Three different phenotypes of erythromycin-resistant Streptococcus pyogenes in Finland. J Antimicrob Chemother 1993; 32:885-91. [PMID: 8144429 DOI: 10.1093/jac/32.6.885] [Citation(s) in RCA: 229] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
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638
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Yu WD, Yu Q, Ding MX, Zhai ZH. [The relationship between vaccinia virus DNA replication and intermediate filaments]. SHI YAN SHENG WU XUE BAO 1993; 26:239-47. [PMID: 8191801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Various DNA components which were extracted with gentle cell fractionation from the HeLa cells after 4 h vaccinia virus infection were detected by dot hybridization technique. The virus DNA mainly exist in intermediate filament-lamina-nuclear matrix complex. With DGD embedment free technique and electron microscopic autoradiography, the newly synthesized virus DNA is found to be associated with intermediate filaments. The results of southwestern hybridization demonstrate that vaccinia virus DNA has specific affinity to intermediate filaments and some nuclear matrix proteins.
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639
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Yu X, Yu Q. Protective effect of Salmonella typhimurium Re-LPS antiserum. CHINESE MEDICAL SCIENCES JOURNAL = CHUNG-KUO I HSUEH K'O HSUEH TSA CHIH 1993; 8:151-6. [PMID: 8142630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
There is increasing evidence that antiserum to LPS can reduce the morbidity and mortality of Gram-negative bacterial infections. We report that antiserum to S. typhimurium SL 1102 (Re mutant strain) has excellent cross-protective activity. Antisera to these bacteria and to their Re-LPS were prepared in rabbits immunized with heat-killed bacterial cells and with Re-LPS preparations. Re-LPS antibody titers were tested by immune hemagglutination (IHA) and by ELISA. These antisera were found to be capable of protecting ICR mice against lethal challenge with S-type S. typhimurium 50014 (100 LD50), E. coli 0111:B4 (32 LD50), Pseudomonas aeruginosa (8 LD50) and Klebsiella pneumonia (16 LD50). We used gastric mucin (5%) as a virulence enhancing agent for the bacterial challenges. The IHA titer of antibody to the homologous strain proved to be much higher than that of other strains. Protection by the sera was 75-100%, 25% and 0% when injected 24, 48 or 72 h before the challenge, respectively. The survival rate was more than 50% when the antiserum was injected 5-7 h after challenge with a ten-fold or higher lethal dose. No protection was observed against such high challenge when the serum was injected later. According to these results, Re-LPS antiserum provides better protection than S-type specific antisera.
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640
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Luo JC, Sun DX, Yu Q, Liu DH, Sun MH. [Initial investigation of the value of CT in pulmonary metastases originating from head and neck malignant tumors]. SHANGHAI KOU QIANG YI XUE = SHANGHAI JOURNAL OF STOMATOLOGY 1993; 2:144-6. [PMID: 15159827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
CT image and its diagnostic value were analyzed and compared with plain chest film on 12 cases of pulmonary metastases originating from malignant tumors of head and neck,all cases were pathologically verified.CT scan performed on each cases who had definite or suspicious lesion on plain chest film.The result presents that CT can:(1)confirm the suspiciousness of metastatic lesion.(2)confirm the number of metastatic lesion.(3)early detection on pulmonary metastasis. 4.identification on occult pulmonary metastasis. 5.Find out costal bone and pleural metastasing accuracy of pulmonary metastasis,but also provide information for clinical selecting treatment.
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641
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Yu Q, Zhou J, Fung YC. Neutral axis location in bending and Young's modulus of different layers of arterial wall. THE AMERICAN JOURNAL OF PHYSIOLOGY 1993; 265:H52-60. [PMID: 8342664 DOI: 10.1152/ajpheart.1993.265.1.h52] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
With few exceptions, experimental results on the blood vessel elasticity have been analyzed with the blood vessel wall treated as a homogeneous material, probably because the experiments have been limited to inflation and stretching. To advance the subject, we must evaluate the force-deformation relationship of different layers of the vessel. A key strategy to do this is to study nonaxisymmetric deformation of the vessel wall so that the different layers of the vessel may deform in different amounts at different places. One of the most effective nonaxisymmetric deformations that can be imposed on the vessel wall is bending. The first important question to ask about bending is, Where is the neutral axis? In this study, a method to determine the neutral axis is presented. We found that the neutral axis of the aorta of the pig lies in the medial layer about one-third of the wall thickness from the endothelium. We measured the strain distribution in the vessel wall by optical methods. Using the load-deflection relationship, we evaluated the Young's modulus of the intima-media layer and that of the adventitia. They differ by an order of magnitude. Our results show that the Young's modulus of the intima-media layer of the pig thoracic aorta is 43.2 +/- 15.8 kPa, whereas the Young's modulus of the adventitial layer is 4.70 +/- 1.72 kPa, in a linear range of the stress-strain relationship including the zero-stress state and the no-load state.
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642
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Dai QC, Bao XH, Huang BT, Yu Q, Gu WM, Sun J. [Observation of clinical effect of bioactive glass titanium alloy core implant]. SHANGHAI KOU QIANG YI XUE = SHANGHAI JOURNAL OF STOMATOLOGY 1993; 2:69-72. [PMID: 15159847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
A novel kind of implant made of titanium alloy spray coated with a suitable bioactive glass was investigated.49 implantation were done in clinical patients from Oct 1988 to 1992.42 implantation functioned well up to the time.7 implantation failed. The success rate is 85.71%.The authors have also discussed the indications,method of implantation and other related things on the paper.
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643
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Wang X, Zhang X, Yu Q, Harmon BN. Multiple-scattering theory for electromagnetic waves. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:4161-4167. [PMID: 10006557 DOI: 10.1103/physrevb.47.4161] [Citation(s) in RCA: 79] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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644
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Yu Q, Cerklewski FL, Whanger PD, Hedstrom O, Ridlington JW. Effect of dietary fluoride on selenite toxicity in the rat. Biol Trace Elem Res 1992; 34:265-78. [PMID: 1384617 DOI: 10.1007/bf02783682] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Three factorial experiments were conducted to determine if high dietary fluoride (F) would inhibit selenite toxicity in rats. Initially, three levels of selenite (0.05, 3, and 5 mg/kg diet) were matched against three levels of F (2, 75, and 150 mg/kg diet). Fluoride failed to prevent the depressive effect of selenite on 8-wk food intake and body wt gain. Selenium (Se) concentration of plasma and kidney and enzymatic activity of whole blood glutathione peroxidase (GSH-Px) were also unaffected by F. Liver Se concentration, however, was slightly (12%) but significantly (p < 0.025) reduced when the highest F and Se levels were combined. Fluoride (150 mg/kg) appeared to reduce liver selenite toxicity (5 mg/kg). Therefore, further study focused on liver histology with treatments that eliminated the middle levels of selenite and F. Fluoride prevented the hepatic necrosis seen in selenite-toxic rats. Similar histological lesions were not observed for kidney or heart. Fluoride partially (26%) but significantly (p < 0.025) reduced thiobarbituric-reactive substances in selenite-toxic rats, but there was no F effect on intracellular distribution of liver Se, glutathione levels in liver and kidney, or on liver xanthine oxidase activity. Overall, the protective effect of F on selenite toxicity appears to be confined to liver pathology. The exact mechanism for this effect, however, remains unclear.
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645
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Xu JJ, Yu Q. [An epidemiological survey and treatment of blindness in Kaipin County of Guangdong Province]. [ZHONGHUA YAN KE ZA ZHI] CHINESE JOURNAL OF OPHTHALMOLOGY 1992; 28:265-6. [PMID: 1299577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
An epidemiological survey of blindness was carried out in Kaipin County of Guangdong Province during October 1989 to May 1990, by stratified random cluster sampling. The sample population was 11,588, and the rate of blindness was 0.216%. The prevalence of blindness in persons aged 60 years and over was 48 times those of all other age groups combined. Since cataract accounted for 64% of the total blind cases, hence it was the key objective for surgical restoration of vision. Among 109 patients who were operated on for cataract, 83 cases were re-examined a half year later, and 78 cases (94%) had vision over 0.05.
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646
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Yu Q, Sheng J. [Determination of magnolol and honokiol in different processed samples of houpo by HPLC method]. ZHONGGUO ZHONG YAO ZA ZHI = ZHONGGUO ZHONGYAO ZAZHI = CHINA JOURNAL OF CHINESE MATERIA MEDICA 1992; 17:404-6, 445. [PMID: 1445643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
HPLC was applied to determine and compare 17 samples of Houpo processed in different ways: sauted with ginger juice, dipped with ginger juice, boiled with ginger juice, and so on. The results provide a scientific basis for screening the best processing technology of Houpo.
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647
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Yu Q, Lenardo T, Weinberg RA. The N-terminal and C-terminal domains of a receptor tyrosine phosphatase are associated by non-covalent linkage. Oncogene 1992; 7:1051-7. [PMID: 1317540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We have cloned the rat homolog of the human leukocyte common antigen-related gene (LAR), which encodes a transmembrane receptor phosphotyrosine phosphatase, and raised antibodies against its protein product. We present evidence here for a processing event resulting in a two-chain structure of the mature receptor on the cell surface. The LAR protein is synthesized as a 190-kDa precursor which is subsequently cleaved into 145-kDa and 85-kDa fragments. The 145-kDa fragment, representing the amino terminus of the protein, is exclusively extracellular and is modified by N-linked glycosylation. The 85-kDa component, derived from the C-terminus of the protein, contains the transmembrane region and intracellular phosphotyrosine phosphatase domains. The two products, associated in a non-covalent manner, comprise the functional LAR cell-surface receptor.
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648
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Yu Q, Davis PJ, Brown TD, Cavanagh D. Sequence and in vitro expression of the M2 gene of turkey rhinotracheitis pneumovirus. J Gen Virol 1992; 73 ( Pt 6):1355-63. [PMID: 1607858 DOI: 10.1099/0022-1317-73-6-1355] [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: 12/27/2022] Open
Abstract
Negative-stranded virion RNA and oligonucleotide primers complementary to fusion (F) protein gene sequences were used to generate cDNA clones, revealing that the gene 5'-proximal to the F protein corresponded to the M2 (22K) gene, as in respiratory syncytial (RS) virus. The transcription start signal, GGGACAAGU, was identical to that of the F and matrix (M) proteins of turkey rhinotracheitis virus (TRTV). There were two sequences with the potential to function as transcription termination/poly(A) signals, located at nucleotides 751 to 762 and 777 to 787; 15 clones derived from mRNA indicated that the first of these sequences formed the major signal. Part of the next downstream (5') gene was sequenced; unlike mammalian pneumoviruses the TRTV M2 gene did not overlap the beginning of the 5'-proximal gene. Northern blotting indicated that infected Vero cells contained less M2 mRNA than F mRNA and that about half of the M2 mRNA was present as a F-M2 dicistronic mRNA. The M2 gene contained two overlapping open reading frames (ORFs 1 and 2), as with RS virus. ORF 1 comprised 558 nucleotides with the coding potential for a 186 amino acid polypeptide, M(r) 20959, eight or nine residues shorter than for human RS virus strains. The overall amino acid identity was 40%, the N-terminal one-third of the proteins sharing 62% of residues, the remainder 29%. A hydropathy plot of the TRTV M2 protein had close similarity to that of the M2 or RS virus. The protein was predicted to have a basic character with no N-terminal signal sequence or other major highly hydrophobic sequences. In vitro translation of a transcript comprising both ORFs 1 and 2 produced a single product of apparent M(r) 23000, corresponding to the M2 product of ORF 1. Site-directed mutagenesis confirmed that this product was derived from ORF 1 and that frameshifting was not involved. The second ORF was expressed only from a transcript which lacked the AUG codons of ORF 1 and, although occupying a similar position to that in the RS virus M2 gene, had virtually no amino acid identity in its 73 residue length and was approximately 25% shorter than the corresponding RS virus ORF 2. The hydropathy plot of the potential products of the second ORFs of TRTV and RS virus showed little resemblance. Taken together these results suggest that ORF 2 is unlikely to be expressed in vivo.(ABSTRACT TRUNCATED AT 400 WORDS)
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649
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Sun DX, Jin YW, Yu Q, Wang PZ. A radiologic study of pulmonary metastases originating from oral and maxillofacial tumors. ORAL SURGERY, ORAL MEDICINE, AND ORAL PATHOLOGY 1992; 73:633-7. [PMID: 1518654 DOI: 10.1016/0030-4220(92)90112-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A retrospective clinical and radiologic study was carried out on 103 consecutive cases of oral and maxillofacial malignant conditions in which pulmonary metastasis occurred. The most frequent primary site was the palate. The neoplasm most commonly involved was the adenoid cystic carcinoma. Pulmonary metastases were classified into five types: solitary, multiple nodular, multiple "massy," diffuse, and miliary.
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650
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Roboz J, Yu Q, Holland J. Filter paper sampling of whole blood and urine for the determination of D/L arabinitol ratios by mass spectrometry. J Microbiol Methods 1992. [DOI: 10.1016/0167-7012(92)90041-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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