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  • Electronic Resource  (17)
  • 1995-1999  (17)
  • 1955-1959
  • 1999  (6)
  • 1995  (11)
  • 11
    Electronic Resource
    Electronic Resource
    The effects of clonidine on cardiovascular responses to standing in healthy volunteers (1995)
    Springer
    Clinical autonomic research 5 (1995), S. 171-177 
    Details
    ISSN: 1619-1560
    Keywords: clonidine ; sympathetic nervous system ; blood pressure monitoring ; hypotension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study assessed the effects of clonidine on blood pressure (BP) and heart rate responses to active standing, recorded continuously using a Finapres monitor. Ten subjects were given a placebo infusion over 1 h, followed by clonidine hydrochloride 1.5 µg/kg over 2 h. During placebo and at 1, 3 and 19 h following the clonidine infusion, heart rate and blood pressure were recorded during the second half of supine rest for 10 min, active standing and quiet standing for 7 min. Clonidine did not alter the size of immediate drop in BP on standing, although the nadir was lower. BP recovery was impaired, with a loss of the usual BP overshoot in most subjects and with delays in reaching supine levels of diastolic BP (6.1 versus 9.6 s; p 〈 0.01) and systolic BP (8.1 versus 12.3 s; p 〈 0.05). The compensatory initial heart rate rise was significantly increased from 47 to 53 beats/min (p 〈 0.05), athough the peak rate reached was reduced from 114 to 104 beats/min (p 〈 0.05). These results demonstrate that impairment of central sympathetic vasomotor drive leads to a delay in BP recovery and loss of initial BP overshoot immediately after standing, together with impaired maintenance of early steady-state BP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01826201
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  • 12
    Electronic Resource
    Electronic Resource
    Some effect of sodium application on the yield and chemical composition of pasture grown under differing conditions of potassium and moisture supply (1995)
    Springer
    Plant and soil 176 (1995), S. 117-127 
    Details
    ISSN: 1573-5036
    Keywords: denitrification ; fertiliser microsite ; grassland ; hypomagnesemic tetany ; nitrate uptake ; potassium status ; sodium fertilisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of Na fertiliser (supplied as an NPK-Na compound) on herbage yield and composition were examined at two different sites to see if pasture responses to Na were affected by differences in K and moisture availability. At one site, pasture was grown under conditions of moisture stress and limited K availability, whereas at the other site the pasture was grown under comparatively non-stress conditions. The results were interesting in that Na fertilisation appeared to be detrimental to pasture yield and quality under conditions of moisture stress and suboptimal K supply, whereas under the non-stress conditions it actually increased herbage N offtake, marginally improved the nutritional quality of the pasture and produced appreciable (albeit non-significant) increases in DM yield. It was suggested that an important effect of Na on grass production may have been its ability to enhance the rate of NO3 − uptake by plants, thereby minimising NO3 −-N losses from the soil-plant system by denitrification. However, because the amount of N fertiliser used in the experiments (i.e. 390 kg N ha−1 yr−1) was close to that normally required for maximum yield production (N max) under Northern Ireland conditions, the scope for yield increases in response to Na-elicited improvements in N offtake were thought to have been very limited at both experimental sites. On the basis of results from both the present study and previous field trials, a unifying theory is presented to explain the differential effects of Na on NO3 − uptake and herbage growth under different sets of circumstances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017682
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  • 13
    Electronic Resource
    Electronic Resource
    New sources of resistance of cowpea (Vigna unguiculata) toStriga gesnerioides, a parasitic angiosperm (1995)
    Springer
    Euphytica 84 (1995), S. 165-174 
    Details
    ISSN: 1573-5060
    Keywords: Alectra vogelii ; cowpea propagation ; field trials ; in vitro screen ; resistance mechanisms ; Striga gesnerioides ; Vigna unguiculata (cowpea)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Thirty-seven accessions of cowpea and yard-long bean were assessed for resistance toStriga gesnerioides. Cowpea plants were grown using anin vitro method, then inoculated with young seedlings ofS. gesnerioides produced from seed from three West African countries. Resistance was assessed by comparing the number and size ofS. gesnerioides tubercles on these accessions with those on a known susceptible cowpea, cv. Blackeye. Two cowpea landraces, APL-1 and 87-2, were completely resistant toS. gesnerioides from Burkina Faso, Mali and Cameroon and partially resistant toS. gesnerioides from Niger. Complete resistance was expressed either as a hypersensitive response of infected root tissues or as a severely retarded development of successful infections. All other accessions, including three samples of yard-long bean were susceptible toS. gesnerioides. The original 87-2 plants segregated for resistance and susceptibility. However, uniformly resistant progeny were obtained by producing seed from vegetatively propagated clones of single resistant 87-2 plants. Resistance of APL-1 and 87-2 toS. gesnerioides was confirmed in pot and field trials. Neither of these cowpeas were resistant toAlectra vogelii. Varieties APL-1 and 87-2 provide additional sources of resistance to most races ofS. gesnerioides, including a newly discovered virulent race from Benin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01681808
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  • 14
    Electronic Resource
    Electronic Resource
    How Accurate Is the Family History Method for Assessing Siblings' Sexual Orientation? (1999)
    Springer
    Archives of sexual behavior 28 (1999), S. 129-137 
    Details
    ISSN: 1573-2800
    Keywords: SEXUAL ORIENTATION ; FAMILY HISTORY METHOD ; RELIABILITY ; SIBLINGS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Psychology
    Notes: Abstract Previous studies investigating the familialnature of sexual orientation have often relied on thereports of siblings. They have generally obtainedextremely high accuracy rates for proband rating of the sexual orientation of siblings. However,participants in these studies have probably beenunusually open about their sexual orientation, and thusit is uncertain if more representative participantswould have as accurate knowledge about theirfamilies. An unselected sample of twins from theAustralian Twin Registry rated their own, theircotwins', and their siblings' sexual orientations. Weexamined accuracy of heterosexual and homosexual probands'assessments of their twins' sexual orientations, as wellas cotwins' agreement about other siblings'orientations. Concordance between twins' ratings oftheir cotwins' orientations with the cotwins' self-ratedorientations was considerably lower than that found inprevious studies, as was the level of agreement betweenmembers of a twin pair in the assessment of other siblings' sexual orientations. Marital historyas a proxy variable for determining the sexualorientation of older subjects did not support its usewith women, though its use for older men received some weak support.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018715821801
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  • 15
    Electronic Resource
    Electronic Resource
    Short-term anoxia does not impair protein turnover in isolated perfused turtle heart (1995)
    Springer
    Journal of comparative physiology 164 (1995), S. 622-628 
    Details
    ISSN: 1432-136X
    Keywords: Protein turnover ; Normoxia ; Anoxia ; Perfused heart ; Turtle, Trachemys sp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Protein turnover was studied under conditions of normoxia and anoxia in isolated perfused turtle (Trachemys (=Pseudemys) scripta elegans) hearts at 15 °C. Protein synthesis was measured by 3H-labelled phenylalanine incorporation into the protein pool. Protein degradation was studied using the protein synthesis inhibitor cycloheximide and measuring phenylalanine release from the heart. Heart rate, cardiac output and ventricle pressure development were unaffected by 2 h of anoxia. Protein synthesis rate was tenfold lower in turtle heart than in rat heart at their respective body temperatures. However, 1 h of anoxia did not affect the rate of protein synthesis in turle heat. RNA content of both ventricle and atria decreased after anoxic perfusion. Protein synthesis rates in atria were higher than those of ventricle under conditions of either anoxia or normoxia. Protein degradation rate did not change in cycloheximide-treated turtle hearts after 2 h of anoxia. These findings indicate that lack of oxygen per se does not affect protein turnover in the isolated perfused turtle heart. This feature presumably allows protein turnover to proceed in vivo during routine dives at elevated temperatures. Also, the turtle heart is a good model system to study the effects of anoxia on protein turnover without the potentially confounding factor of contractile failure. These hearts are very resistant to anoxia and well able to maintain contractility for extended periods of time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389803
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  • 16
    Electronic Resource
    Electronic Resource
    A Family History Study of Male Sexual Orientation Using Three Independent Samples (1999)
    Springer
    Behavior genetics 29 (1999), S. 79-86 
    Details
    ISSN: 1573-3297
    Keywords: Family history ; male sexual orientation ; X-linked gene ; male homosexuality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Available evidence suggests that male homosexuality is both familial and somewhat heritable and that some cases may be caused by an X-linked gene. However, most studies have recruited subjects in a relatively unsystematic manner, typically via advertisements, and hence suffer from the potential methodological flaw of ascertainment bias due to volunteer self-selection. In the present study we assessed the familiality of male homosexuality using two carefully ascertained samples and attempted to replicate findings consistent with X-linkage in three samples. The percentage of siblings of the probands rated as either homosexual or bisexual, with a high degree of certainty, ranged from 7 to 10% for brothers and 3 to 4% for sisters. These estimates are higher than recent comparable population-based estimates of homosexuality, supporting the importance of familial factors for male homosexuality. Estimates of λs for male homosexuality ranged from 3.0 to 4.0. None of the samples showed a significantly greater proportion of maternal than paternal homosexual uncles or homosexual male maternal first cousins. Although our results differed significantly with those of some prior studies, they do not exclude the possibility of moderate X-linkage for male sexual orientation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021652204405
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  • 17
    Electronic Resource
    Electronic Resource
    Retrospectively measured individual differences in childhood sex-typed behavior among gay men: Correspondence between self- and maternal reports (1995)
    Springer
    Archives of sexual behavior 24 (1995), S. 613-622 
    Details
    ISSN: 1573-2800
    Keywords: homosexuality ; memory ; masculinity-femininity ; gender nonconformity ; sexual orientation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Psychology
    Notes: Abstract Male sexual orientation is strongly associated with childhood sex-typed behavior, but there are also marked within-orientation differences. Gay men show increased variance compared to heterosexual men on retrospective measures of childhood sex-typed behavior. Individual differences among gay men for their degree of sex-typed behavior may have important implications. However, there has been little attention given to the reliability or validity of retrospective measures of such differences that are most common. Gay men and their mothers completed questionnaires assessing the men's sex-typicality during childhood. Results of structural modeling analyses found that mothers' and sons' reports were significantly associated, both regarding the general level of sex-typed behavior and the specific behaviors, supporting the validity of retrospectively measured individual differences for those characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01542183
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