826
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Huang Q, Huang L, Dai G, Liang J. Structure of SrxBa3−x(B3O6)2 in a solid solution. Acta Crystallogr C 1992. [DOI: 10.1107/s0108270191009228] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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827
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Barata BA, Liang J, Moura I, Legall J, Moura JJ, Huynh BH. Mössbauer study of the native, reduced and substrate-reacted Desulfovibrio gigas aldehyde oxido-reductase. EUROPEAN JOURNAL OF BIOCHEMISTRY 1992; 204:773-8. [PMID: 1311679 DOI: 10.1111/j.1432-1033.1992.tb16693.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The Desulfovibrio gigas aldehyde-oxido-reductase contains molybdenum and iron-sulfur clusters. Mössbauer spectroscopy was used to characterize the iron-sulfur clusters. Spectra of the enzyme in its oxidized, partially reduced and benzaldehyde-reacted states were recorded at different temperatures and applied magnetic fields. All the iron atoms in D. gigas aldehyde oxido-reductase are organized as [2Fe-2S] clusters. In the oxidized enzyme, the clusters are diamagnetic and exhibit a single quadrupole doublet with parameters (delta EQ = 0.62 +/- 0.02 mm/s and delta = 0.27 +/- 0.01 mm/s) typical for the [2Fe-2S]2+ state. Mössbauer spectra of the reduced clusters also show the characteristics of a [2Fe-2S]1+ cluster and can be explained by a spin-coupling model proposed for the [2Fe-2S] cluster where a high-spin ferrous ion (S = 2) is antiferromagnetically coupled to a high-spin ferric ion (S = 5/2) to form a S = 1/2 system. Two ferrous sites with different delta EQ values (3.42 mm/s and 2.93 mm/s at 85 K) are observed for the reduced enzyme, indicating the presence of two types of [2Fe-2S] clusters in the D. gigas enzyme. Taking this observation together with the re-evaluated value of iron content (3.5 +/- 0.1 Fe/molecule), it is concluded that, similar to other Mo-hydroxylases, the D. gigas aldehyde oxido-reductase also contains two spectroscopically distinguishable [2Fe-2S] clusters.
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828
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Tian H, Liang J, Ma X, Yu T, Yang L, Qui D. [The variations of PRL, LH, FSH and testosterone in renal disease]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1992; 23:94-7. [PMID: 1398636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Blood PRL was measured with RIA in 22 males and 19 females with various degrees of renal insufficiency. At the same time, blood LH, FSH, testosterone were studied in all the male patients and 20 sex-age matched healthy subjects. The results showed that the levels of PRL and LH were increased, and the level of testosterone was decreased significantly in male uremic patients. There was a significant negative correlation between PRL and testosterone. All the above parameters were measured again 8-25 days after continuous ambulatory peritoneal dialysis (CAPD) therapy in 5 male uremic patients. The BUN and Cr levels decreased and the clinical manifestations of uremia improved, but the levels of PRL, LH, FSH and testosterone showed no significant changes. The mechanisms of these variations were discussed.
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829
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Krause N, Liang J. Cross-cultural variations in depressive symptoms in later life. Int Psychogeriatr 1992; 4 Suppl 2:185-202. [PMID: 1288662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The purpose of this study is twofold: to estimate the prevalence of depressive symptoms among older adults in four culturally diverse groups (white Americans, black Americans, Japanese, Taiwanese), and to assess whether there are cross-cultural variations in the way depressive symptoms are manifest. Data from three recent nationwide surveys in the United States, Japan, and Taiwan reveal that the lowest overall levels of depressive symptoms are found among Japanese elderly, followed by Taiwanese, white Americans, and black Americans respectively. Based on previous cross-cultural research, it was hypothesized that the Japanese tend to express depressive symptoms as interpersonal complaints, whereas Taiwanese are more likely to manifest somatic symptoms. In contrast, Americans were expected to express depressive symptoms in the form of depressed cognitions. The findings failed to support these hypotheses. Instead, older Americans tended to have higher scores than Orientals on all three depressive symptom clusters.
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830
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Liang J, Bennett J, Whitelaw N, Maeda D. The structure of self-reported physical health among the aged in the United States and Japan. Med Care 1991; 29:1161-80. [PMID: 1745076 DOI: 10.1097/00005650-199112000-00001] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
This article attempts to extend the generalizability of a three-dimensional model of self-reported physical health among the aged to a nonwestern culture. Consisting of three interrelated dimensions, chronic illness, functional status, and self-rated health, this model was empirically evaluated by using national data on the aged gathered in the United States and Japan. The three-dimensional specification was found to apply equally well to U.S. and Japanese elderly. In addition to examining the internal structure of this three-dimensional model, the study assessed the model's relationships with a set of selected exogenous variables including age, sex, marital status, and education. The relationships between the selected exogenous variables and physical health dimensions are largely similar in both countries. However, clear differences appeared in at least three instances.
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831
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Tong N, Liang J. [The effect of gemfibrozil on serum apo C II and C III in diabetic hyperlipidemia]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1991; 22:409-11. [PMID: 1814823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The effects of gemfibrozil on apolipoproteins C II and C III (apo C II, C III) were observed in 20 NIDDM hyperlipidemic patients. All of the patients continued their anti-diabetic treatment, gemfibrozil 900 mg/day for 4 weeks. The results revealed no significant change in fasting plasma glucose (FPG) and HbA1 before and after the study. But after the treatment with gemfibrozil, the following parameters changed significantly: total cholesterol (TC) decreased by 18.64% (P less than 0.01), total triglyceride (TG) decreased by 65.05% (P less than 0.001), VLDL-C decreased by 63.19% (P less than 0.001), HDL-C increased by 44.23% (P less than 0.001), apo C III decreased by 31.38% (P less than 0.02), and the ratio of apo C III/C II reduced by 35.49% (P less than 0.01). These findings suggest that gemfibrozil has excellent effect on decreasing apo C III and the ratio of apo C III/C II, thus facilitates the metabolism of chylomicron and decreases TG level in hyperlipidemic diabetic patients.
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832
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Krause N, Jay G, Liang J. Financial strain and psychological well-being among the American and Japanese elderly. Psychol Aging 1991. [PMID: 1863386 DOI: 10.1037//0882-7974.6.2.170] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Research in the United States indicates that stressful life events may create psychological distress among older adults by eroding their sense of personal control and by diminishing their feelings of self-worth. The purpose of this study was twofold: (a) to replicate these findings with data provided by a recent nationwide survey of elderly people in the United States (N = 1,523) and (b) to compare these findings with results obtained from a nationwide survey of older adults in Japan (N = 1,517). The findings from both surveys are quite similar. The data indicate that financial strain tends to erode feelings of control and self-worth in both cultures, and the weakening of these personal resources in turn tends to increase depressive symptoms.
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833
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Luo H, Jiang Y, Cheng S, Han N, Li X, Ye S, Liang J. A preliminary study on the antimutagenic properties of vegetables and fruits. CHINESE MEDICAL SCIENCES JOURNAL = CHUNG-KUO I HSUEH K'O HSUEH TSA CHIH 1991; 6:113-8. [PMID: 1804376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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834
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Abstract
This article proposes and evaluates two models for integrating self-reported health status measures for the elderly with dominant conceptualizations of physical health. Each model includes three dimensions of physical health: chronic illness, functional limitation, and self-rated health. In Model 1, the dimensions are linked in a causal framework, whereas in Model 2, a second-order factor, labeled physical health status, is hypothesized to account for the relationships among the three dimensions. Each model was tested with data gathered in Cleveland (N = 1,834) and Virginia (N = 2,146) using the Older Americans Resources and Services Multidimensional Functional Assessment Questionnaire (OARS MFAQ). Analyses were further replicated by randomly dividing each sample. Both models fit the data well; their utilities will depend on the way in which physical health is conceptualized and on the nature of the research question at hand.
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835
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Tian H, Liang J, Zhang X. [Malondialdehyde-modified-low density lipoprotein in diabetes mellitus]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1991; 22:97-9. [PMID: 1774047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Malondialdehyde-modified-low density lipoprotein (MDA-LDL), lipid peroxide (LPO), lipid and fasting blood glucose (FBG) were studied in 42 diabetic patients and 20 age-matched controls. The results revealed that both MDA-LDL per L serum and MDA-LDL per mol LDL-C of diabetics were higher than those of controls. MDA-LDL/L tended to be much higher in diabetic patients with vascular disease and hyperlipidemia. There was a positive correlation between MDA-LDL/L and LPO, LDL-C, TC, respectively.
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836
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Krause N, Jay G, Liang J. Financial strain and psychological well-being among the American and Japanese elderly. Psychol Aging 1991; 6:170-81. [PMID: 1863386 DOI: 10.1037/0882-7974.6.2.170] [Citation(s) in RCA: 75] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Research in the United States indicates that stressful life events may create psychological distress among older adults by eroding their sense of personal control and by diminishing their feelings of self-worth. The purpose of this study was twofold: (a) to replicate these findings with data provided by a recent nationwide survey of elderly people in the United States (N = 1,523) and (b) to compare these findings with results obtained from a nationwide survey of older adults in Japan (N = 1,517). The findings from both surveys are quite similar. The data indicate that financial strain tends to erode feelings of control and self-worth in both cultures, and the weakening of these personal resources in turn tends to increase depressive symptoms.
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837
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Liang J, Madden M, Shah VK, Burris RH. Citrate substitutes for homocitrate in nitrogenase of a nifV mutant of Klebsiella pneumoniae. Biochemistry 1990; 29:8577-81. [PMID: 2271541 DOI: 10.1021/bi00489a011] [Citation(s) in RCA: 83] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
An organic acid extracted from purified dinitrogenase isolated from a nifV mutant of Klebsiella pneumoniae has been identified as citric acid. H2 evolution by the citrate-containing dinitrogenase is partially inhibited by CO, and by some substrates for nitrogenase. The response of maximum velocities to changes in pH for both the wild-type and the NifV- dinitrogenase was compared. No substantial differences between the enzymes were observed, but there are minor differences. Both enzymes are stable in the pH range 4.8-10, but the enzyme activities dropped dramatically below pH 6.2.
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838
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Krause N, Liang J, Keith V. Personality, social support, and psychological distress in later life. Psychol Aging 1990. [PMID: 2242236 DOI: 10.1037//0882-7974.5.3.315] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A conceptual model was developed to address 2 issues that have received relatively little attention in the social support literature. First, an attempt was made to assess the interrelationships among 3 types or dimensions of supportive social relations. In addition, the impact of selected psychological and social factors on social support use was examined. Findings from a nationwide survey of older adults in the United Kingdom suggest that social contact tends to increase the amount of received support, and received support in turn tends to bolster perceptions of support availability in the future (i.e., anticipated support). With regard to the second issue, social roles (especially marital status) and social extraversion emerged as potentially important correlates of social support use in later life.
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839
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Liang J, Dai B. [Study on the production, identification of serogroup-specific monoclonal antibodies against leptospires of Australis serogroup and detection of its antigen]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1990; 21:234-8. [PMID: 1709413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Spleen cells of BALB/c mice immunized with whole Leptospira interrogans serogroup Australis serovar australis strain 620 were fused with myeloma cells line SP2/0. Specificities of four McAbs determined by MAT. 2E1 McAb (IgG3) reacted with 11 serovars, of the Australis serogroup, but did not react with 22 representative serovars of L. interrogans in 20 serogroups, L. biflexa strain patoc I and Leptonema illini strain 3055. 2E1 McAb showed serogroup specificity for Australis by agglutination and the other 3 McAbs showed partial serogroup specificity. We compared the outer envelope (OE) protein profiles of serovar australis strain 620 with those of two pathogenic L. interrogans serovar lai strain 601 and serovar hebdomadis strain 156 by SDS-PAGE. 63kd protein profile was only found in the OE of strain 620, and the quantity of 42kd protein of strain 620 was greater than that of strain 601 and 156. The immunoblotting revealed that 2E1 McAb reacted with a 34kd band in the OE preparation of serovar australis strain 620, but did not react with that of other two L. interrogans. 2E1 McAb also did not react with OE of non-pathogenic leptospires. It was suggested that 34kd protein might contain the antigenic determinants which were shared by leptospires of Australis serogroup.
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840
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Gray JW, Kuo WL, Liang J, Pinkel D, van den Engh G, Trask B, Tkachuk D, Waldman F, Westbrook C. Analytical approaches to detection and characterization of disease-linked chromosome aberrations. Bone Marrow Transplant 1990; 6 Suppl 1:14-9. [PMID: 2202466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Flow karyotyping and FISH with chromosome specific or disease-locus-specific probes are powerful adjuncts to conventional cytogenetic analysis. Flow karyotyping is well suited to quantitative analysis of DNA content changes that occur during structural rearrangement. FISH with probes for repeated sequences allows ready detection of aneuploidy in interphase cells. FISH with whole chromosome composite probes to metaphase spreads facilitates detection of subtle structural changes and allows detection of structural aberrations that occur at frequencies as low as 10(-3). FISH with locus-specific probes facilitates diagnosis of specific genetic diseases, allows phenotype-genotype correlation on a cell-by-cell basis and may be developed into a sensitive method for detection of residual disease.
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841
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Liang J, Zhou A, Chen M, Xu S. Negatively regulatory effects of paeoniflorin on immune cells. Eur J Pharmacol 1990. [DOI: 10.1016/0014-2999(90)92731-w] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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842
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Wu L, Liang J, Yu M, Chen S, Xin D, Wu D. Clinical application of microcomputer to visual function examination. YAN KE XUE BAO = EYE SCIENCE 1990; 6:27-31, 35. [PMID: 2101355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Microcomputer technique is put into use in ophthalmological clinical visual function examination. In visual EOG, ENG, visual tracking, contrast sensitivity and VEP examination, objectifying and standardization of experiment and data analysis are achieved by computer technique. In addition, a lot of manpower and time is saved, test results are obtained faster and more accurately. The basic rational of computerization in clinical visual function examination is presented.
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843
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Cai F, Liang J, Liao X. [Preliminary report of efficacy of diabetic polyneuropathy treated with large dose inositol]. HUA XI YI KE DA XUE XUE BAO = JOURNAL OF WEST CHINA UNIVERSITY OF MEDICAL SCIENCES = HUAXI YIKE DAXUE XUEBAO 1990; 21:201-3. [PMID: 2391105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Ten diabetics with polyneuropathy were studied by taking 6g inositol tablets (each tablet contains 0.25g inositol) per day for three months. The results showed that large dose inositol could reduce the severity of clinical symptoms, but there was no improvement of the nerve conduction velocity. The possible mechanism of these changes was discussed. According to the clinical observation of the therapeutic effect in those 10 cases, the authors would deem that large dose inositol is an effective drug for diabetic polyneuropathy, and it is worthy of further clinical trial, but other sensitive indicators should be used to evaluate the efficacy of this drug.
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844
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Liang J, Lawrence RH, Bennett JM, Whitelaw NA. Appropriateness of composites in structural equation models. JOURNAL OF GERONTOLOGY 1990; 45:S52-9. [PMID: 2313053 DOI: 10.1093/geronj/45.2.s52] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The appropriateness of using composites instead of multiple indicators in a structural model of physical health was evaluated. Liang's (1986) specification of self-reported physical health is a relatively complex multiple indicators model which may not be practical in actual application. To simplify this formulation, a two-stage strategy was used. First, reliability was estimated for each composite to fix the measurement error variance and the regression of the composite on the latent variable. Second, the model was reestimated by constraining these parameters. Regression analyses were undertaken to assess the impact of using composites instead of multiple indicators. Parameter estimates for causal linkages and residual error variances based on multiple indicators approach were closely reproduced by using composites, thus providing justification for the proposed strategy.
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845
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Abstract
A structural model relating actual and perceived peer smoking to perceived peer pressure and to adolescent cigarette smoking was developed and replicated in two independent subsamples of the data. Data was gathered from 2334 suburban adolescents in grades 8 and 11 in a large metropolitan area. Four dimensions of peer pressure were discovered and were found to relate differentially to adolescent smoking. The major findings were that pathways representing modeling and normative pressure to smoke had roughly equal impact on adolescent smoking. Direct pressure to smoke cigarettes did not have a significant path to adolescent smoking. Adolescents reported low levels of both normative and direct pressure to smoke cigarettes. Smoking adolescents appear to see the peer group, not as encouraging them to smoke, but as not providing any discouragement for smoking. Finally, adolescents who were experimenting with smoking or were smokers overestimated the amount of smoking by their best friends.
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846
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Krause N, Liang J, Keith V. Personality, social support, and psychological distress in later life. Psychol Aging 1990; 5:315-26. [PMID: 2242236 DOI: 10.1037/0882-7974.5.3.315] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A conceptual model was developed to address 2 issues that have received relatively little attention in the social support literature. First, an attempt was made to assess the interrelationships among 3 types or dimensions of supportive social relations. In addition, the impact of selected psychological and social factors on social support use was examined. Findings from a nationwide survey of older adults in the United Kingdom suggest that social contact tends to increase the amount of received support, and received support in turn tends to bolster perceptions of support availability in the future (i.e., anticipated support). With regard to the second issue, social roles (especially marital status) and social extraversion emerged as potentially important correlates of social support use in later life.
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847
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Liang J, Lipscomb WN. Binding of sulfonamide and acetamide to the active-site Zn2+ in carbonic anhydrase: a theoretical study. Biochemistry 1989; 28:9724-33. [PMID: 2514807 DOI: 10.1021/bi00451a028] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Self-consistent field molecular orbital (SCF MO) calculations at both 4-31G and STO-3G levels have been used to examine the binding conformations of sulfonamide and acetamide compounds to the active site of carbonic anhydrase. The results are as follows: (1) sulfonamide binds to the Zn2+ ion in its deprotonated form through the sulfonamide nitrogen to the fourth coordination site of the metal ion; (2) acetamide as neutral species binds to the basic form of the enzyme through the carbonyl oxygen to the fifth coordination site of the metal ion; and (3) the acetamidate ion binds to the acid form of the enzyme through the amide nitrogen to form a tetracoordinated metal complex with three histidine ligands. Analysis of the effects of individual active-site residues on the binding conformations of these inhibitors suggests that metal alone favors bidentate coordination of sulfonamidate and acetamidate complexes and that electron donation from three histidine ligands to the metal ion determines the formation of a tetracoordinated metal complex, which is further stabilized by the presence of Thr 199, as it receives one hydrogen bond from the sulfonamide NH- or from the acetamide NH- and donates a backbone NH hydrogen bond to a sulfonamide oxygen. The calculated binding conformation of sulfonamide and the hydrogen-bonding interactions between sulfonamide and the enzyme are consistent with the X-ray diffraction study of the AMSulf-HCA II complex. However, no X-ray structures are available for amide-HCA II complexes.(ABSTRACT TRUNCATED AT 250 WORDS)
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848
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Liang J, Rossi M. Near-ultraviolet circular dichroism of bovine high molecular weight alpha-crystallin. Invest Ophthalmol Vis Sci 1989; 30:2065-8. [PMID: 2777524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
High molecular weight (HMW) alpha-crystallin isolated from cow nucleus has a molecular weight greater than 5 x 10(6) Daltons. Its particle dimensions have been reported to be over 500 nm. It is derived mainly from low molecular weight (LMW) alpha-crystallin. The conformational change as LMW alpha-crystallin is converted into HMW alpha-crystallin was studied by near-ultraviolet circular dichroism (NUV-CD). The main concern in measuring CD for protein aggregates with particle dimensions as high as HMW alpha-crystallin and with an irregular shape is the contribution of differential scattering. The differential scattering becomes increasingly more important for particles with dimensions greater than 1/20th the wavelength of light. This contribution was minimized by increasing the acceptance half-angle of detection. The present data indicate that bovine HMW alpha-crystallin has a different tertiary structure from LMW alpha-crystallin.
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849
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Liang J, Levin JS, Krause NM. Dimensions of the OARS mental health measures. JOURNAL OF GERONTOLOGY 1989; 44:P127-38. [PMID: 2768771 DOI: 10.1093/geronj/44.5.p127] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A measurement model of mental health for the Older Americans Resources and Services (OARS) questionnaire is described. Using confirmatory factor analysis on noninstitutionalized elderly from Cleveland (N = 1834) and Virginia (N = 2146), the 21 OARS mental health items were fit to a 15-item model. In addition to the second-order construct of mental health, there were four first-order dimensions: life satisfaction, psychosomatic symptomatology, alienation, and cognitive deficit. Analyses were further replicated by splitting both samples in half. The model fit well and compared favorably to other alternative specifications. In addition to this analysis of internal structure, the model was also examined in relation to several exogenous factors including age, sex, race, education, and physical health. While the model again fit well, a model with cognitive deficit separate from the other factors seemed more reasonable.
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850
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Tu EJ, Liang J, Li SM. Mortality decline and Chinese family structure: implications for old age support. JOURNAL OF GERONTOLOGY 1989; 44:S157-68. [PMID: 2738319 DOI: 10.1093/geronj/44.4.s157] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
This study examined the effect of mortality change on the probabilities of survival for various family members and parent/child joint life expectation in Chinese mainland and Taiwan during the past 60 years. Major increases in life expectancy have led to the doubling of the average number of person years of an individual's life spent as a grandparent during that time. In a sense, the family burden of old age support is twice as much as before. It is concluded that the role of family in providing old age support needs to be complemented and reinforced by public programs.
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