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Paavonen J, Miettinen A, Stevens CE, Chen KC, Holmes KK. Mycoplasma hominis in nonspecific vaginitis. Sex Transm Dis 1983; 10:271-5. [PMID: 6689379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The prevalence of nonspecific vaginitis was 24% among 98 randomly selected women examined at a clinic for sexually transmitted diseases and 32% among 135 women with suspected cervicitis at the same clinic. Mycoplasma hominis was isolated more often and serum antibody levels to M. hominis were higher in women with nonspecific vaginitis than in women without nonspecific vaginitis. Similarly, the rate of isolation of Gardnerella vaginalis and the quantitative growth of G. vaginalis were higher for women with nonspecific vaginitis. Abnormal results of gasliquid chromatographic analysis of vaginal fluid and the presence of abnormal diamines in the vaginal fluid also were associated with nonspecific vaginitis and with the isolation of M. hominis, whether or not G. vaginalis was isolated. Further studies of the ecologic interactions among M. hominis, G. vaginalis, and anaerobes in nonspecific vaginitis are needed for a better understanding of the pathogenesis of this syndrome.
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Amsel R, Totten PA, Spiegel CA, Chen KC, Eschenbach D, Holmes KK. Nonspecific vaginitis. Diagnostic criteria and microbial and epidemiologic associations. Am J Med 1983; 74:14-22. [PMID: 6600371 DOI: 10.1016/0002-9343(83)91112-9] [Citation(s) in RCA: 1483] [Impact Index Per Article: 36.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Numerous previous studies of nonspecific vaginitis have yielded contradictory results regarding its cause and clinical manifestations, due to a lack of uniform case definition and laboratory methods. We studied 397 consecutive unselected female university students and applied sets of well defined criteria to distinguish nonspecific vaginitis from other forms of vaginitis and from normal findings. Using such criteria, we diagnosed nonspecific vaginitis in up to 25 percent of our study population; asymptomatic disease was recognized in more than 50 percent of those with nonspecific vaginitis. A clinical diagnosis of nonspecific vaginitis, based on simple office procedures, was correlated with both the presence and the concentration of Gardnerella vaginalis (Hemophilus vaginalis) in vaginal discharge, and with characteristic biochemical findings in vaginal discharge. Nonspecific vaginitis was also correlated with a history of sexual activity, a history of previous trichomoniasis, current use of nonbarrier contraceptive methods, and, particularly, use of an intrauterine device. G. vaginalis was isolated from 51.3 percent of the total population using a highly selective medium that detected the organism in lower concentration in vaginal discharge than did previously used media. Practical diagnostic criteria for standard clinical use are proposed. Application of such criteria should assist in clinical management of nonspecific vaginitis and in further study of the microbiologic and biochemical correlates and the pathogenesis of this mild but quite prevalent disease.
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153
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Chen KC. [Epidemiological survey on an outbreak of campylobacterosis]. ZHONGHUA LIU XING BING XUE ZA ZHI = ZHONGHUA LIUXINGBINGXUE ZAZHI 1982; 3:326-7. [PMID: 7185479] [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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154
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Chen KC, Culbertson NJ, Knapp JS, Kenny GE, Holmes KK. Rapid method for simultaneous detection of the arginine dihydrolase system and amino acid decarboxylases in microorganisms. J Clin Microbiol 1982; 16:909-19. [PMID: 7153341 PMCID: PMC272502 DOI: 10.1128/jcm.16.5.909-919.1982] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
A specific procedure has been developed for the detection of the first two enzymes involved in the arginine dihydrolase system and the detection of the decarboxylases of arginine, glutamic acid, histidine, lysine, ornithine, phenylalanine, tryptophan, and tyrosine. A loopful of growth of each organism from dihydrolase-decarboxylase induction agar medium (or broth) was washed and incubated separately with 0.2-ml samples of three test media supplemented with different amino acids. Each spent test medium was dansylated, and the dansyl derivatives were separated by two-dimensional thin-layer chromatography on polyamide sheets. The end products (citrulline, ornithine, gamma-amino-n-butyric acid, and amines) produced during incubation were estimated by comparing the fluorescent intensities of end products from the spent test media and of the corresponding parent amino acids from test medium controls after thin-layer chromatography. The method is reproducible, requiring incubation of an organism in three test media for 1 h for simultaneous detection of the first two enzymes involved in the arginine dihydrolase system and of eight amino acid decarboxylases. This method has been successfully applied to gram-positive and gram-negative microorganisms and also to Mycoplasmatales. It could simplify and improve the accuracy of the corresponding biochemical tests performed in clinical laboratories for the identification and differentiation of microorganisms, and it may prove particularly useful for the differentiation of species of Pseudomonas and Mycoplasma.
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155
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Sandstrom EG, Chen KC, Buchanan TM. Serology of Neisseria gonorrhoeae: coagglutination serogroups WI and WII/III correspond to different outer membrane protein I molecules. Infect Immun 1982; 38:462-70. [PMID: 6183215 PMCID: PMC347762 DOI: 10.1128/iai.38.2.462-470.1982] [Citation(s) in RCA: 69] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The 125I-labeled tryptic peptides of the outer membrane protein I of 33 previously characterized serological reference strains of Neisseria gonorrhoeae were investigated by peptide maps in relation to their coagglutination W serogroup. Serogroup WI strains tended to have lower-molecular-weight protein I molecules than did WII strains, and WIII strains had the highest-molecular-weight protein I molecules, although the serogroup could not be predicted from the molecular weights of the protein I molecules for a given strain. All 13 strains belonging to serogroup WI were found to have 11 peptides in common, as judged by their migration with respect to one another and to the internal marker valine in the peptide maps. Common peptides isolated from a given strain were found to comigrate with the corresponding common peptides from other strains in the same serogroup under various electrophoretic conditions. The 20 strains belonging to serogroups WII and WIII were all found to have 10 common peptides by the same criteria. When common peptides from serogroup WI were compared with the common peptides of serogroups WII and WIII, only three of these peptides appeared to be similar. Thus, two different outer membrane protein I molecules seem to exist which are mutually exclusive. Protein IA molecules contain the antigens recognized as serogroup WI, and protein IB molecules contain the antigens that characterize serogroups WII and WIII.
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156
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Gubish ER, Chen KC, Buchanan TM. Detection of a gonococcal endo-beta-N-acetyl-D-glucosaminidase and its peptidoglycan cleavage site. J Bacteriol 1982; 151:172-6. [PMID: 6806239 PMCID: PMC220223 DOI: 10.1128/jb.151.1.172-176.1982] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Neisseria gonorrhoeae contains several hydrolases which may be responsible for gonococcal cell lysis. One of these enzymes, an endo-beta-N-acetyl-D-glucosaminidase, has been extracted from supernatants of sonicated gonococci and partially purified by ammonium sulfate precipitation and affinity and ion-exchange chromatography. This enzyme has a different specificity than egg white lysozyme and cleaves the beta 1 leads to 4 glycosidic linkage between N-acetylglucosamine and N-acetylmuramic acid in gonococcal peptidoglycan.
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157
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Gubish ER, Chen KC, Buchanan TM. Attachment of gonococcal pili to lectin-resistant clones of Chinese hamster ovary cells. Infect Immun 1982; 37:189-94. [PMID: 6125476 PMCID: PMC347510 DOI: 10.1128/iai.37.1.189-194.1982] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Pili facilitate the attachment of virulent Neisseria gonorrhoeae to host cells. Isolated pili and peptides from pili obtained by cyanogen bromide cleavage were used in attachment assays to Chinese hamster ovary cells and their lectin-resistant clones. Pili and the largest cyanogen bromide fragment (CNBrI) from the amino-terminal portion of the pilin molecule attached to a greater degree to the parent cell and showed 40 to 75% reduced attachment to clones deficient in cell surface oligosaccharides. The CNBrI fragment, with a molecular weight of approximately 10,000, bound specifically to host proteins with subunit molecular weights of 14,000 to 16,000 that were electrophoretically transferred onto nitrocellulose sheets from polyacrylamide gel patterns of host cells. Periodate or galactosidase treatment of pili or the CNBrI fragment markedly reduced attachment, suggesting the importance of galactose residues on pili for their attachment function. Similarly, highly purified exoglycosidase or trypsin treatment of the parent cell reduced attachment, suggesting that oligosaccharide moieties of cell surface components (glycoproteins or glycolipids or both) were receptors for pili attachment. This study indicated that the portion of the pilin molecule involved in attachment resides on the CNBrI fragment and that sugar moieties, both on pili and on the host cell, were required for optimal attachment.
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158
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Chen KC, Amsel R, Eschenbach DA, Holmes KK. Biochemical diagnosis of vaginitis: determination of diamines in vaginal fluid. J Infect Dis 1982; 145:337-45. [PMID: 7061879 DOI: 10.1093/infdis/145.3.337] [Citation(s) in RCA: 97] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
To assess correlations between the content of the diamines putrescine and cadaverine in vaginal fluid and the clinical manifestations of vaginitis, a rapid procedure for the determination of diamines has been developed. The procedure involves thin-layer chromatography of the dansylated vaginal washings; then the fluorescence of dansyl diamines is compared with that of dansyl alanine. For 520 college women, the result of the test for diamines was positive in 173 (88%) of 197 women with nonspecific vaginitis or vaginitis due to Trichomonas vaginalis and was negative in 291 (90%) of 323 women without nonspecific vaginitis or vaginitis due to T. vaginalis. The diamine content of vaginal fluid specimens after therapy with metronidazole was correlated with the clinical response to treatment.
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159
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Chen KC, Vostal JJ. Aryl hydrocarbon hydroxylase activity induced by injected diesel particulate extract vs inhalation of diluted diesel exhaust. J Appl Toxicol 1981; 1:127-31. [PMID: 6206112 DOI: 10.1002/jat.2550010213] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The effects of long-term inhalation of diluted diesel exhaust on aryl hydrocarbon hydroxylase activity (AHH) and cytochrome P-450 content in lung and liver microsomes were investigated in male Fischer-344 rats and compared with repeated parenteral administration of organic solvent extracts of hydrocarbons adsorbed on the diesel particulate surface during the combustion process. The animals were exposed to concentrations of 750 micrograms m-3 or 1500 micrograms m-3 of diesel particulates from a 5.7L GM diesel engine 20 h per day, 5 1/2 days per week for up to 9 months or treated by repeated IP injections of diesel particulate extract (dissolved in corn oil) from the same engine at several dose levels for 4 days. No significant effects of long-term inhalation exposure were observed in liver microsomal AHH activity. A slight decrease in lung microsomal AHH activity was found in rats following 6 months of exposure to diesel exhaust at the particulate concentration of 1500 micrograms m-3. The total mass of particles deposited in the lung during the inhalation exposure was estimated and an equivalent dose of extractable hydrocarbons was administered intraperitoneally; no increase in AHH activity was observed in the lung or liver microsomes. In contrast, 1.4- to 9-fold increases in AHH activity were observed in liver and lung microsomes of rats pretreated by intraperitoneal doses 10-50 times larger than the most conservative estimate of the deposited lung burden. No changes in cytochrome P-450 content were observed in the microsomes of rat liver after inhalation or injection treatment studies.(ABSTRACT TRUNCATED AT 250 WORDS)
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160
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161
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Chen KC, Buchanan TM. Hydrolases from Neisseria gonorrhoeae. The study of gonocosin, an aminopeptidase-P, a proline iminopeptidase, and an asparaginase. J Biol Chem 1980; 255:1704-10. [PMID: 6766452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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162
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Chen KC, Dorough HW. Glutathione and mercapturic acid conjugations in the metabolism of 2,4-dinitrobromobenzene. Drug Chem Toxicol 1980; 3:305-18. [PMID: 7449656 DOI: 10.3109/01480548009002225] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The formation of glutathione (GSH) conjugate in the detoxification of [Ring-UL-14C]-2,4-dinitrobromobenzene (DNBB) was investigated using rat liver cytosolic fraction. The mercapturic acid conjugate in rats was also studied by collection of urine of rats dosed with radioactive DNBB by intraperitoneal injection. The glutathione replaced the labile bromo atom and formed the conjugate, S-(2,4-dinitrophenyl)glutathione. The GSH conjugate was confirmed by amino acid analysis and by mass spectroscopy as well as co-cochromatography with the synthetic compound. The amount of formation of GSH conjugate was dependent on the amount of GSH added in the incubation mixture. When [Ring-UL-14C]-DNBB was dosed to rats, 69% and 17% of the radiocarbon was excreted via the urine and feces within 72 hours, respectively. The major radioactive metabolite present in the acid urine of DNBB treated was S-(2,4-dinitrophenyl)mercapturic acid accounting for 60% of the administered dose of radiocarbon. The mercapturic acid conjugate was identified similarly to methods used for identification of GSH conjugate. The data demonstrated that GSH conjugate, formed initially and then subsequently converted into the mercapturic acid excreted in the urine, was the major metabolic pathway in the metabolism of 2,4-dinitrobromobenzene.
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163
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Chu CY, Chen KC. Inhibition of DNA-induced transformation by concanavalin A in Bacillus subtilis. Biochem Biophys Res Commun 1979; 91:170-6. [PMID: 117804 DOI: 10.1016/0006-291x(79)90599-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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164
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Chen KC, Buchanan TM, Davick PR, Holmes KK. Determination of biogenic amines using heterocyclic cation and aromatic anion elution. Anal Biochem 1979; 97:282-5. [PMID: 525791 DOI: 10.1016/0003-2697(79)90073-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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165
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Chen KC, Forsyth PS, Buchanan TM, Holmes KK. Amine content of vaginal fluid from untreated and treated patients with nonspecific vaginitis. J Clin Invest 1979; 63:828-35. [PMID: 447831 PMCID: PMC372023 DOI: 10.1172/jci109382] [Citation(s) in RCA: 151] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
We examined the vaginal washings from patients with nonspecific vaginitis (NSV) to seek biochemical markers and possible explanations for the signs and symptoms of this syndrome. Seven amines were identified including methylamine, isobutylamine, putrescine, cadaverine, histamine, tyramine, and phenethylamine. These amines may contribute to the symptoms of NSV and may contribute to the elevated pH of the vaginal discharge. They may also be partly responsible for the "fishy" odor that is characteristic of vaginal discharges from these patients. Among the seven amines, putrescine and cadaverine were the most abundant and were present in all vaginal discharges from each of ten patients before treatment. These amines are produced in vitro during growth of mixed vaginal bacteria in chemically defined medium, presumably by decarboxylation of the corresponding amino acids. We hypothesize the anaerobic vaginal organisms, previously shown to be quantitatively increased in NSV, are responsible for the amine production, because metronidazole inhibited the production of amines by vaginal bacteria in vitro, and Haemophilus vaginalis did not produce amines. H. vaginalis did release high concentrations of pyruvic acid and of amino acids during growth in peptone-starch-dextrose medium, whereas, other vaginal flora consumed both pyruvic acid and amino acids in the same medium during growth. These findings suggest that a symbiotic relationship may exist between H. vaginalis and other vaginal flora in patients with NSV.
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166
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Chang HF, Hou LT, Chen KC. Roentgenocephalometric studies on normal occlusion and malocclusion among Chinese. V: A comparison of the craniofacial pattern among Angle's class I, class II and class III occlusions. TAIWAN YI XUE HUI ZA ZHI. JOURNAL OF THE FORMOSAN MEDICAL ASSOCIATION 1979; 78:213-20. [PMID: 286010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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167
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Chen KC, Dorough HW. Glutathione and mercapturic acid conjugations in the metabolism of naphthalene and 1-naphthyl N-methylcarbamate (carbaryl). Drug Chem Toxicol 1979; 2:331-54. [PMID: 120242 DOI: 10.3109/01480547909016028] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The formation of glutathione (GSH) conjugate in the detoxification of [1-14C]-naphthalene and [naphthyl-14C]-carbaryl was investigated using rat liver homogenate. The mercapturic acid conjugate in rats was also investigated by collection of urine after intraperitoneal injection of 14C substrates. The formation of water-soluble metabolites in vitro from naphthalene was dependent on the amount of glutathione added, but this was not seen in carbaryl metabolism. In vitro, the metabolism of [1-14C]-naphthalene produced 50% GSH conjugates in the incubation mixture, whereas in vivo the metabolism of this compound produced 65% mercapturic acid conjugate in the urine. There was no evidence of GSH or mercapturic acid conjugate in the metabolism of [naphthyl-14C]-carbaryl in vitro and in vivo. This conclusion was made by comparing the nature and chemical characteristics of GSH and mercapturic acid conjugates formed in [1-14C]-naphthalene metabolism. With the aid of the specific enzyme (e.g. beta-glucuronidase and sulfatase) and acid hydrolysis, the water-soluble metabolites of [naphthyl-14C]-carbaryl were tentatively recognized as glucuronide or sulfate conjugated mainly with 5,6-dihydro-5,6-dihydroxycarbaryl or N-hydroxy-methyl carbaryl and their hydrolytic products. This data demonstrated that the substituent group on the naphthalene molecule may affect the significance of GSH conjugation.
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168
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Hackett CJ, Chen KC. Quantitative isolation of native chitin from resistance structures of Sordaria and Ascaris species. Anal Biochem 1978; 89:487-500. [PMID: 727447 DOI: 10.1016/0003-2697(78)90378-0] [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: 12/24/2022]
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169
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Chen KC, Lin CI. A system for studying effects of microwaves on cells in culture. THE JOURNAL OF MICROWAVE POWER 1978; 13:251-6. [PMID: 255162 DOI: 10.1080/16070658.1978.11689102] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An improved design of the fluid-filled waveguide-exposure chamber is described for studying effects of microwave radiation on cells in vitro. The system with a micropipette sample holder may be used as a prototype to isolate the apparent nonthermal factor of microwave radiation on cells in culture from those effects resulting from cell temperature rise. This system also allows more precise calibration of incident and absorbed microwave energies. Compared with control, somatic cells of the Chinese hamster exhibited a lower rate of growth and difference in morphology after 2450 MHz microwave radiation for 20 min at a power density of 500 mW/cm2.
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170
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Hermodson MA, Chen KC, Buchanan TM. Neisseria pili proteins: amino-terminal amino acid sequences and identification of an unusual amino acid. Biochemistry 1978; 17:442-5. [PMID: 413571 DOI: 10.1021/bi00596a010] [Citation(s) in RCA: 158] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The amino-terminal amino acid sequences of the pili proteins from four antigenically dissimilar strains of Neisseria gonorrhoeae, from Neisseria meningiditis, and from Escherichia coli were determined. Although antibodies raised to the pili protein from a given strain of gonococcus cross-reacted poorly or not at all with each of the other strains tested, the amino-terminal sequences were all identical. The meningococcal protein sequence was also identical with the gonococcal sequence through 29 residues, and this sequence was highly homologous to the sequence of the pili protein of Moraxella nonliquifaciens determined by other workers. However, the sequence of the pili protein from E. coli showed no similarity to the other sequences. The gonococcal and meningococcal proteins have an unusual amino acid at the amino termini, N-methylphenylalanine. In addition, the first 24 residues of these proteins have only two hydrophilic residues (at positions 2 and 5) with the rest being predominantly aliphatic hydrophobic amino acids. The preservation of this highly unusual sequence among five antigenically dissimilar Neisseria pili proteins implies a role for the amino-terminal structure in pilus function. The amino terminus may be directly or indirectly (through preservation of tertiary structure) important for the pilus function of facilitating attachment of bacteria to human cells.
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171
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Chen KC. Roentgenocephalometric studies on normal occlusion and malocclusion among Chinese. III. General trend of growth change in facial divergency, a cross-sectional study from childhood to adulthood. TAIWAN YI XUE HUI ZA ZHI. JOURNAL OF THE FORMOSAN MEDICAL ASSOCIATION 1978; 77:113-9. [PMID: 306418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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172
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Chen KC. Roentgenocephalometric studies on normal occlusion and malocclusion among Chinese. II. A comparison among normal-bites, open-bites and deep-bites. TAIWAN YI XUE HUI ZA ZHI. JOURNAL OF THE FORMOSAN MEDICAL ASSOCIATION 1977; 76:935-49. [PMID: 273656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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173
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Chen KC. Roentgenocephalometric studies on normal occlusion and malocclusion among Chinese. I. Cranio-dento-facial structural variations associated with mandibular inclination in normal-bites. TAIWAN YI XUE HUI ZA ZHI. JOURNAL OF THE FORMOSAN MEDICAL ASSOCIATION 1977; 76:880-96. [PMID: 273069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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174
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Chen KC. Extremity of semantic differential ratings in deaf and hearing subjects. THE JOURNAL OF GENERAL PSYCHOLOGY 1977; 96:231-6. [PMID: 864438 DOI: 10.1080/00221309.1977.9920819] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A comparison was made separately by sex of 19 deaf and 19 hearing Ss on mean semantic differential ratings of contradictory concept-pairs. There were nine deaf males, 10 deaf females, 11 hearing males, and eight hearing females with mean ages of 23.00, 21.90, 20.73, and 19.75, respectively. It was hypothesized that the deaf would make less extreme ratings of concept-pairs than hearing Ss and that they would shift their ratings of contradictory concept-pairs closer to the mean of the original ratings of the single concepts comprising the pairs. It was found that both predictions were true only for deaf males. Deaf females did not differ from hearing Ss.
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175
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Chen KC, Lin CJ. Proceedings: Cytotoxic effects of electromagnetic radiation on chinese hamster cells in culture. THE JOURNAL OF MICROWAVE POWER 1976; 11:140-1. [PMID: 1047668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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