2451
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Liu W. [Peutz-Jeghers syndrome]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1984; 22:570-1. [PMID: 6532727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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2452
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Lo AC, Liu W, Nazar RN. Alternative conformational states in the ribosome-associated 5.8S RNA. EUROPEAN JOURNAL OF BIOCHEMISTRY 1984; 141:549-53. [PMID: 6745258 DOI: 10.1111/j.1432-1033.1984.tb08228.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Two conformations of the 5.8S rRNA have been distinguished by gel electrophoresis. Diethyl pyrocarbonate and dimethyl sulphate reactivity were used to probe these conformational states in both the free molecule and those associated with 28S RNA or the ribosome. Both conformations could be demonstrated in each case and in every instance four residues, C50, A52, G53, C54, which were strongly reactive in the faster-migrating conformation were essentially unreactive in the slower-migrating form. These results suggest that the two conformations differ in the degree to which the tertiary structure is folded and raise the possibility that the 5.8S rRNA functions in translation by switching between alternative conformational states.
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2453
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Abstract
The structure of the 5.8 S ribosomal RNA in rat liver ribosomes was probed by comparing dimethyl sulfate-reactive sites in whole ribosomes, 60 S subunits, the 5.8 S-28 S rRNA complex and the free 5.8 S rRNA under conditions of salt and temperature that permit protein synthesis in vitro. Differences in reactive sites between the free and both the 28 S rRNA and 60 S subunit-associated 5.8 S rRNA show that significant conformational changes occur when the molecule interacts with its cognate 28 S rRNA and as the complex is further integrated into the ribosomal structure. These results indicate that, as previously suggested by phylogenetic comparisons of the secondary structure, only the "G + C-rich" stem may remain unaltered and a universal structure is probably present only in the whole ribosome or 60 S subunit. Further comparisons with the ribosome-associated molecule indicate that while the 5.8 S rRNA may be partly localized in the ribosomal interface, four cytidylic acid residues, C56, C100, C127 and C128, remain reactive even in whole ribosomes. In contrast, the cytidylic acid residues in the 5 S rRNA are not accessible in either the 60 S subunit or the intact ribosome. The nature of the structural rearrangements and potential sites of interaction with the 28 S rRNA and ribosomal proteins are discussed.
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2454
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Smouse PE, Neel JV, Liu W. Multiple-locus departures from panmictic equilibrium within and between village gene pools of Amerindian tribes at different stages of agglomeration. Genetics 1983; 104:133-53. [PMID: 6862182 PMCID: PMC1202060 DOI: 10.1093/genetics/104.1.133] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
A comparative analysis of departures from multiple-locus Hardy-Weinberg equilibrium is presented for a set of four tribal Indian groups (the Yanomama, Makiritare, Wapishana and Ticuna) from the lowlands of South America. These tribes span a range of agglomeration and acculturation from the most traditional, swidden horticulturalists to frontier townspeople. The small-group social organization typical of traditional horticulturalists leads to substantial departures from tribal panmixia, as manifested by the distribution of multiple-locus genotypes both within and between villages. Within villages, the departures from single-locus Hardy-Weinberg equilibrium are small and nonsignificant, but the departures from gametic equilibrium (independence of loci) are substantial, even for the unlinked loci we have used to characterize these populations. The departures from single-locus homogeneity across villages are also substantial. One of the normal concomitants of increasing acculturation in this setting is an increase in agglomeration. As agglomeration increases, the departures from multiple-locus panmixia decrease, a process that can be very rapid. We discuss both the shifting balance theory of evolution and punctuated evolutionary rates in light of the small group social organization that must have obtained throughout most of human evolution.
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2455
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Breitschwerdt EB, Barta O, Waltman C, Hubbert NL, Pourciau SS, Liu W. Serum proteins in healthy Basenjis and Basenjis with chronic diarrhea. Am J Vet Res 1983; 44:326-8. [PMID: 6187250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A serologic survey was conducted to characterize the electrophoretic patterns of serum proteins in healthy Basenji dogs (n = 137) and Basenjis with chronic diarrhea (n = 32). Serum protein electrophoresis values for Basenjis were similar to previously reported values from dogs of other breeds. Dogs with histologically confirmed lymphocytic-plasmacytic enteritis had a statistically significant (P less than 0.05) decrease in total protein, albumin, and albumin/globulin ratio. alpha 2-Globulin and gamma-globulin values were significantly increased in old dogs (9 years of age or older) with lymphocytic-plasmacytic enteritis. Although not statistically significant, gamma-globulin values were generally increased in Basenjis with lymphocytic-plasmacytic enteritis when compared with the values in age-matched clinically healthy Basenjis.
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2456
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Liu W, Ding M, Hsu M. New methods for synthesis of the colored Edman degradation reagent, 4-N,N-dimethylaminoazobenzene-4'-isothiocyanate. Anal Biochem 1982; 127:426-7. [PMID: 6819786 DOI: 10.1016/0003-2697(82)90197-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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2457
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Bai Y, Xu XH, Jin ZM, Liu W, Liu JH, Chi ZS. Diagnostic problems of insulinoma. Chin Med J (Engl) 1982; 95:181-5. [PMID: 6284449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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2458
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Shires PK, Braund KG, Milton JL, Liu W. Effect of localized trauma and temporary splinting on immature skeletal muscle and mobility of the femorotibial joint in the dog. Am J Vet Res 1982; 43:454-60. [PMID: 7073061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The right pelvic limbs of 2 groups of dogs were splinted in extension for 2 weeks. In 1 of these groups, the dogs were anesthetized and the distal portion of the quadriceps femoris muscle was traumatized before splinting. Two groups of control dogs were also used; neither group was splinted, but 1 group was anesthetized, and their muscles were traumatized. The range of motion of the femorotibial joint was measured in all 4 groups before splinting and 3 and 9 weeks after splinting. Types I and II muscle fiber diameters and percentages were also recorded at 3 and 9 weeks in all groups. Flexion of the femorotibial joint was limited after splinting (P less than 0.001), but less so after trauma and splinting than after splinting alone (P less than 0.0001). A reversible type I fiber atrophy occurred in most restricted muscles (P less than 0.001) and early type II fiber atrophy was seen in a few muscles after trauma and splinting (P less than 0.002). Multifocal fiber necrosis was the only irreversible change seen after 3 weeks of splinting with or without concurrent muscle trauma. Relative fiber percentages did not change appreciably during splinting or recovery.
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2459
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2460
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Kahng MW, Liu W, Sanefuji H, Resau JH, Heatfield BM, Trump BF. Aryl hydrocarbon hydroxylase in human prostate. Chem Biol Interact 1981; 34:249-56. [PMID: 6780206 DOI: 10.1016/0009-2797(81)90136-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Aryl hydrocarbon hydroxylase (AHH) was present in explant cultures of human prostate obtained from surgery of benign prostatic hyperplasia and was inducible by benz[a]anthracene (BA). The induction of AHH ranged from 14- to 150-fold when compared with control values and 10-fold variation of AHH inducibility among individuals was observed. Epithelial cells grown from human prostate tissue also contained measurable AHH activity and AHH was inducible by BA and 7,12-dimethylbenz[a]anthracene (DMBA). Inducibility of AHH by BA ranged from 2- to 63-fold. The inducibility of AHH by DMBA was always less than that by BA. In cells treated with N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), there were no changes in AHH activity. These findings support the view that the human prostate is susceptible to environmental polycyclic hydrocarbon carcinogens and that environmental and occupational factors might contribute to the etiology of human prostatic carcinoma.
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2461
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Chang KS, Liu W. Expression of tumor associated antigens by a producer and a nonproducer leukemia induced by Rauscher virus (R-MuLV). Cell Immunol 1979; 42:373-83. [PMID: 427880 DOI: 10.1016/0008-8749(79)90202-8] [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: 12/15/2022]
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2462
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Abstract
Although community consultation is common for psychiatrists, such activity is usually carried out on an elective rather than emergency basis. In a world troubled by community disaster situations--children are often at risk. Psychiatrists, through the use of skillful crisis consultation, can be of great help to these young people. This report describes the effort of a mental health consultation team to meet the needs of a large population of children under acute stress.
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2463
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Manier E, Liu W, Solomon D. Abortion: New Directions for Policy Studies. Stud Fam Plann 1978. [DOI: 10.2307/1965954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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2464
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Liu W, Bidwai AV, Stanley TH, Isern-Amaral J. Cardiovascular dynamics after large doses of fentanyl and fentanyl plus N2O in the dog. Anesth Analg 1976; 55:168-72. [PMID: 943974 DOI: 10.1213/00000539-197603000-00008] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The effects of large doses of fentanyl (0.05 to 2 mg/kg) and fentanyl plus N2O on cardiovascular dynamics were determined in 10 unpremedicated dogs breathing 100% O2. Using computer analysis of the central aortic pulsepressure curve, stroke volume (SV), cardiac output, heart rate (HR), peripheral vascular resistance (PVR), and systolic, diastolic, and mean arterial blood pressures (BP) were determined while fentanyl was being given at a rate of 0.3 to 0.44 mg/min. Fentanyl caused a dose-related decrease in HR, which was significant at 0.05 mg/kg. Cardiac output, PVR, and systolic, diastolic, and mean arterial BP were also decreased and SV increased. The latter changes became significant at 0.1 mg/kg for diastolic BP; 0.15 mg/kg for cardiac output and mean BP; 0.25 mg/kg for sv and systolic BP; and at 1.25 mg/kg for peripheral vascular resistance. Addition of N2O after fentanyl did not significantly change any parameter, although SV, cardiac output, and HR were usually increased and PVR decreased. These data demonstrate that, while large doses of fentanyl or fentanyl plus N2O do alter cardiovascular dynamics in dogs, the changes appear to be less profound than those produced by equianalgesic doses of morphine. Our findings suggest that large doses of fentanyl-O2 may be an attractive alternative to morphine-O2 anethesia in critically ill patients.
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2465
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Liu W, Trzeciak H, Schüssler H, Meienhofer J. Influence of the complex formation between trypsin and bovine basic trypsin inhibitor on the reactivity of certain disulfide bonds. Biochemistry 1971; 10:2849-55. [PMID: 5315642 DOI: 10.1021/bi00791a008] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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2466
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Liu W. Cytodiagnosis of endometrial carcinoma. CANADIAN JOURNAL OF MEDICAL TECHNOLOGY 1971; 33:26-31. [PMID: 5552832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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2467
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2468
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Liu W. Hypoestrogenism and endometrial carcinoma. Acta Cytol 1970; 14:583-5. [PMID: 5277455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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2469
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Goswami JC, Brenner W, Rugg B, Liu W. Amine-catalyzed polymer encapsulation of cotton fibers by vapor phase application of formaldehyde. J Appl Polym Sci 1970. [DOI: 10.1002/app.1970.070141105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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2470
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Liu W. Quick drying mounting fluid. Acta Cytol 1970; 14:306. [PMID: 4935160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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2471
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2472
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Liu W, Koebel L, Shipp J, Prisby H. Cytologic changes following the use of oral contraceptives. Obstet Gynecol 1967; 30:228-32. [PMID: 5212329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Abnormal cytologic findings in gynecologic smears were more common among patients using oral contraceptives than among control patients. Cytologic examination should be routinely performed before oral contraceptives are prescribed. The exfoliation of endometrial cells was essentially the same between control and oral contraceptive patients. No evidence of excessive stimulation of epithelial element in endometrium accompanied the continued use of hormonal contraceptives. In general, the cytohormonal effect associated with oral contraceptives showed a depressed superficial cell count in the vaginal smears. Teenagers using oral contraceptives constituted 2 to 3% of the surveyed group. Long-term effects of antiovulatory drugs in young females are yet to be observed.
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2473
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Liu W. Positive smears in previously screened patients (certain cytologic findings of public health importance). Acta Cytol 1967; 11:193-8. [PMID: 5232017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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2474
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Liu W. Further notes on cell refractometry using phase contrast microscopy. Acta Cytol 1967; 11:51-3. [PMID: 5339923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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2475
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Liu W. Concentration and fractionation of cytologic elements in sputum. Acta Cytol 1966; 10:368-72. [PMID: 5230231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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