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  • 1
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This article reports the continuation of a series of experiments investigating the effects of soft x-ray radiation damage on the contractile elements of mammalian striated muscle (myofibrils), using their ability to contract as a functional assay. The myofibrils were exposed to 385 eV x rays. This energy is within the "water window'' between the oxygen and carbon K edges, where the x-ray absorption coefficient of biological materials, such as protein, is about an order of magnitude greater than that for water. An exposure of 8×105 photons μm−1 was found to prevent contraction in the majority of myofibrils. Preliminary results indicate that it is possible to increase this exposure level by approximately 25% by adding the radioprotective dimethyl sulphoxide (DMSO), an OH radical scavenger to the myofibril buffer during irradiation. This suggests that OH radicals are important in the inactivation of myofibrils through irradiation.
    Type of Medium: Electronic Resource
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  • 2
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    Oxford : Periodicals Archive Online (PAO)
    Medium aevum. 42 (1973) 133 
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  • 3
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    Oxford : Periodicals Archive Online (PAO)
    Medium aevum. 62 (1993) 144 
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 228 (1970), S. 1317-1318 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Meyer-Overton theory infers preferential adsorption of the inert gas to the lipid constituent of cells, whereas alternatives involve the aqueous phase with the formation of clathrates8 or ordered water9 known as "icebergs". The use of fluorinated compounds, however, has provided evidence for ...
    Type of Medium: Electronic Resource
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  • 5
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    Sydney, N.S.W. : Periodicals Archive Online (PAO)
    Australasian Journal of Philosophy. 51 (1973) 39 
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  • 6
    ISSN: 1437-160X
    Keywords: Galactosylation of IgG ; Rheumatoid arthritis ; Pima and Papago Indians
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Previous reports have shown that deficient galactosylation of serum IgG occurs in patients with rheumatoid arthritis (RA) and other autoimmune disorders. In this study, we investigated the relationship between galactosylation of serum IgG and disease status in a population of Pima and Papago Indians, who are characterized by a frequent occurrence of RA. The mean galactose levels of serum IgG collected from 11 individuals 1.5–10 years prior to onset (T1), at onset (T2), and 1.7–7 years post-onset (T3) of RA were lower than those from 25 seronegative controls without RA from the same population (P=0.01, 0.005, and ≦0.001, respectively). The mean galactose content of IgG decreased in the order T1〉T2〉T3, but the differences were not significant. The galactosylation of serum IgG from the RA patients did not differ from that of seropositive Pima Indian controls who did not develop RA over the course of study. The occurrence of IgG galactose deficiency in individuals with RA prior to the onset of the disease supports the contention that this phenomenon may be a risk factor for the development of RA. Furthermore, the occurrence of IgG galactose deficiency in healthy seropositive individuals suggests a relationship between diminished galactosylation and induction of rheumatoid factor (RF).
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0428
    Keywords: Pima Indians ; diabetes mellitus ; pancreatic islets ; islet amyloid ; islet amyloid polypeptide ; insulin resistance ; glucose tolerance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Islet amyloid may have a pathological role in the development of Type 2 (non-insulin-dependent) diabetes mellitus. The prevalence of islet amyloid has been investigated on post-mortem pancreatic tissue from both diabetic and non-diabetic Pima Indian subjects who had previously been assessed by oral glucose tolerance tests. Islets were examined for amyloid deposits and for cellular immunoreactivity to pancreatic hormones and islet amyloid polypeptide, the constituent peptide of islet amyloid. Twenty of 26 diabetic subjects (77%) had islet amyloid, compared with one of 14 non-diabetic subjects (7%). Twelve of the diabetic subjects (46%) had amyloid in more than 10% of their islets, whereas only 4% of islets were affected in a single non-diabetic subject. Positive immunoreactivity for islet amyloid peptide was present in the islet amyloid and in islet cells in 54% of the diabetic and 50% of the non-diabetic subjects. Islet amyloid in diabetic Pima Indians may indicate a primary Beta-cell defect which interacts with insulin resistance to produce diabetes, or may develop as a result of Beta-cell dysfunction induced by insulin resistance and hyperglycaemia.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-0428
    Keywords: Albuminuria ; risk factors ; blood pressure ; Type 2 (non-insulin-dependent) diabetes mellitus ; Pima Indians
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Blood pressure was measured in 490 non-proteinuric Pima Indians from the Gila River Indian Community in Arizona at least 1 year before the diagnosis of Type 2 (non-insulin-dependent) diabetes mellitus. Urine albumin concentration was measured in the same subjects 0–24 years (mean 5 years) after diabetes was diagnosed. Prevalence rates of abnormal albumin excretion (albumin-to-creatinine ratio ≥100 mg/g) after the onset of Type 2 diabetes were 9%, 16%, and 23%, respectively, for the lowest to highest tertiles of pre-diabetic mean blood pressure. When controlled for age, sex, duration of diabetes and pre-diabetic 2-h post-load plasma glucose concentration, higher pre-diabetic mean blood pressure predicted abnormal urinary excretion of albumin after the onset of diabetes. This finding suggests that the higher blood pressure seen in diabetic nephropathy is not entirely a result of the renal disease, but may precede and contribute to it.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-0428
    Keywords: Diabetic nephropathy ; proteinuria ; end-stage renal disease ; Type 2 (non-insulin-dependent) diabetes mellitus ; blood pressure ; Pima Indians
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To identify factors related to the development of end-stage renal disease after the onset of proteinuria, its incidence was determined in 364 Pima Indians aged 35 years or older with Type 2 (non-insulin-dependent) diabetes mellitus and proteinuria (protein-to-creatinine ratio ≥0.5 g/g). Of these 364 subjects, 95 (36 men, 59 women) developed end-stage renal disease. The cumulative incidence was 40% 10 years after and 61% 15 years after the onset of proteinuria. The incidence of end-stage renal disease was significantly related to the duration of diabetes, the duration of proteinuria, higher 2-h plasma glucose concentration, type of diabetes treatment, and the presence of retinopathy at the time of recognition of the proteinuria, but not to age, sex, or blood pressure. Duration of proteinuria influenced the risk of end-stage renal disease, contingent, however, upon the duration of diabetes at the onset of proteinuria. The higher cumulative incidence of end-stage renal disease 15 years after the onset of proteinuria in Pima Indians (61 %) than in Caucasians from Rochester, Minnesota (17%) may be attributable, in part, to the younger age of onset of Type 2 diabetes in Pima Indians than in Caucasians, to ethnic differences in susceptibility to renal disease, or to lower death rates among the Pima Indians from competing causes of death, such as coronary heart disease.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-0428
    Keywords: Physical activity ; obesity ; fat distribution ; glucose intolerance ; Pima Indians ; exercise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The relationships between physical activity, obesity, fat distribution and glucose tolerance were examined in the Pima Indians who have the highest documented incidence of non-insulin-dependent diabetes. Fasting and 2-h post-load plasma glucose concentrations, body mass index, and waist-to-thigh circumference ratios were determined in 1054 subjects aged 15–59 years. Current (during the most recent calendar year) and historical (over a lifetime) leisure and occupational physical activity were determined by questionnaire. Current physical activity was inversely correlated with fasting and 2-h plasma glucose concentrations, body mass index and waist-to-thigh ratios for most sex-age groups even when diabetic subjects were excluded. Controlled for age, obesity and fat distribution, activity remained significantly associated with 2-h plasma glucose concentrations in males. In subjects aged 37–59 years, individuals with diabetes compared to those without reported significantly less leisure physical activity during the teenage years (median hours per week of activity, 9.1 vs 13.2 for men; 1.0 vs 2.2 for women). Controlled for body mass index, sex, age and waist-to-thigh ratio, subjects who reported low levels of historical leisure physical activity had a higher rate of diabetes than those who were more active. In conclusion, current physical activity was inversely related to glucose intolerance, obesity and central distribution of fat, particularly in males. Subjects with diabetes were currently less active and reported less historical physical activity than non-diabetic subjects. These findings suggest that activity may protect against the development of non-insulin-dependent diabetes both directly and through an influence on obesity and fat distribution.
    Type of Medium: Electronic Resource
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