bluuebunny/crossref_metadata_2025_split huggingface dataset:
Personality trait risk factors for attempted suicide among young women with eating disorders
Authors: Youssef G. , Plancherel B. , Laget J. , Corcos M. , Flament M.F. , Halfon O. 
Published: May 2004

AbstractObjectiveClinical observations and a review of the literature led us to hypothesize that certain personality and character traits could provide improved understanding, and thus improved prevention, of suicidal behaviour among young women with eating disorders.MethodThe clinical group consisted of 152 women aged between 18 and 24 years, with DSM-IV anorexia nervosa/restrictive type (AN-R = 66), anorexia nervosa/purging type (AN-P = 37), bulimia nervosa/non-purging type (BN-NP = 9), or bulimia nervosa/purging type (BN-P = 40). The control group consisted of 140 subjects. The assessment measures were the Minnesota Multiphasic Personality Inventory—second version (MMPI-2) scales and subscales, the Beck Depression Inventory (BDI) used to control for current depressive symptoms, plus a specific questionnaire concerning suicide attempts.ResultsSuicide attempts were most frequent in subjects with purging behaviour (30.0% for BN-P and 29.7% for AN-P). Those attempting suicide among subjects with eating disorders were mostly students (67.8%). For women with AN-R the scales for ‘Depression’ and ‘Antisocial practices’ represented significant suicidal risk, for women with AN-P the scales for ‘Hysteria’, ‘Psychopathic deviate’, ‘Shyness/Self-consciousness’, ‘Antisocial Practices’, ‘Obsessiveness’ and ‘Low self-esteem’ were risk indicators and for women with BN-P the ‘Psychasthenia’, ‘Anger’ and ‘Fears’ scales were risk indicators.ConclusionThis study provides interesting results concerning the personality traits of young women with both eating disorders and suicidal behaviour. Students and those with purging behaviour are most at risk. Young women should be given more attention with regard to the risk of suicide attempts if they: (a) have AN-R with a tendency to self-punishment and antisocial conduct, (b) have AN-P with multiple physical complaints, are not at ease in social situations and have antisocial behaviour, or (c) if they have BN-P and tend to be easily angered with obsessive behaviour and phobic worries. The MMPI-2 is an interesting assessment method for the study of traits indicating a risk of suicidal behaviour in young subjects, after controlling for current depressive pathology.
Attempted suicide and psychiatric consultation
Authors: Suominen Kirsi H. , Isometsä Erkki T. , Lönnqvist Jouko K. 
Published: May 2004

AbstractThis study investigated the differences in clinical characteristics between suicide attempters referred or not referred to psychiatric consultation after a suicide attempt and factors affecting such referral to psychiatric aftercare after attempted suicide. All 1198 consecutive suicide attempters treated in hospital emergency rooms in Helsinki during a 12-month period were identified. Data were gathered on any psychiatric consultation after the attempt and on all health care contacts 1 year before and after the index attempt. We found that half of the suicide attempters who were not referred to psychiatric consultation were without any aftercare recommendation and treatment contact soon after their attempt. Factors predicting referral to psychiatric consultation were age, psychotic disorder, lack of substance use disorder and, most strongly, the hospital where the suicide attempt was treated. Although the characteristics of a patient attempting suicide do play a role in determining whether a psychiatric consultation will take place or not, the most important factor is the consultation practices of the particular hospital. This in turn influences the probability of adequate aftercare.
Zooplankton volume trends off Peru between 1964 and 2001
Authors: Ayón Patricia , Purca Sara , Guevara-Carrasco Renato 
Published: May 2004

Abstract
Zooplankton samples were collected by Hensen net (300 μm) vertical hauls from a depth of 50 m in 57 surveys along the Peruvian coast during winter and summer from 1961 to 2001. In general, the latitudinal distribution of total zooplankton volumes showed highest values within 60 nmi (111 km) of the coast. Predominantly during the 1960s, high zooplankton volumes were found between 4°S–6°S and 14°S–16°S, coinciding with narrow continental shelf areas. Strong declines of zooplankton volumes were observed in these regions in the 1990s. In the long term, zooplankton volumes off Peru were higher during “cold” decades, particularly in the 1960s, than during “warm” decades. This research supports the regime-shift previously observed in the Peruvian coastal upwelling, and is in agreement with global changes observed in lower and upper trophic levels elsewhere in the Pacific and North Atlantic basins.
Perinatal exposure to GABA‐transaminase inhibitor impaired psychomotor function in the developing and adult mouse
Authors: Levav T. , Saar T. , Berkovich L. , Golan H. 
Published: May 2004

AbstractAntiepileptic drugs acting through the potentiation of GABA‐ergic pathways have harmful effects on brain development. Increased risk of impaired intellectual development was reported in children born to women treated for epilepsy during pregnancy. Here we examined the vulnerability of the developing brain to treatment with one of the new antiepileptic drugs—vigabatrin—during two time periods in newborn mice (postnatal days 1–7 and 4–14) which parallel the third trimester of human embryo brain development. Delayed development of sensory and motor reflexes, reduced mobility in the open field, impaired object recognition and deficient spatial learning and memory were observed independently of the treatment period. On the contrary, specific susceptibility to the age of exposure was detected in various motor functions. A number of morphological correlates may explain these behavioral alterations; a transient increase in CA1 pyramidal cell layer (P<0.001) and decrease in granular cell layer (P<0.05) in hippocampus were detected at postnatal day 7. In addition, a significantly lower cell density was observed in the adult mouse brain in all layers of the M2 cerebral cortex of mice treated during days 4–14, compared to the controls (P<0.05). Our findings demonstrated short‐ and long‐term deleterious effects of vigabatrin treatment and suggest a specific vulnerability of the developing motor system to GABA enhancement during the first postnatal week.
Activities of the enzymes of hepatic gluconeogenesis in periparturient dairy cows with induced fatty liver
Authors: Murondoti Absolom , Jorritsma Ruurd , Beynen Anton C , Wensing Theo , Geelen Math JH 
Published: May 2004

The objective was to measure the activities of all the enzymes essential for hepatic gluconeogenesis in dairy cows with induced fatty liver. We aimed to induce severe fatty liver in ten experimental cows by overfeeding them during the dry period while seven control cows were maintained on a restricted diet. To induce a marked negative energy balance, the experimental cows were deprived of feed for 8 h immediately after parturition. In addition, the experimental cows were given a restricted amount of diet during the first 5 d of lactation. Liver samples were collected 1 week before and 1, 2 and 4 weeks after parturition. Before parturition, liver triacylglycerol concentrations did not differ between the two groups. After parturition, the experimental cows developed marked fatty liver as indicated by a higher level of triacylglycerols in the liver compared with the control cows.Before parturition, all gluconeogenic enzymes in the liver were lower in experimental cows than in control cows. Phosphoenolpyruvate carboxykinase, pyruvate carboxylase and propionyl-CoA carboxylase were significantly lower and fructose 1,6-bisphosphatase and glucose 6-phosphatase tended to be lower in the experimental cows. The activities of two crucial enzymes for gluconeogenesis in ruminants, i.e., phosphoenolpyruvate carboxykinase and propionyl-CoA carboxylase, remained low throughout the sampling period post partum. Activities of pyruvate carboxylase and glucose 6-phosphatase in the experimental cows post partum were upgraded to values similar to those of the control cows. The results showed that the capacity for hepatic gluconeogenesis before parturition was lower in cows with induced fatty liver than in control cows. After parturition, the low activities of crucial gluconeogenic enzymes indicated insufficient production of glucose. It is suggested that the low gluconeogenic capacity leads successively to low blood glucose concentrations, low insulin levels and high rates of mobilization of fatty acid, causing severe hepatic lipidosis.
Does Economic Crisis Reduce Support for Markets and Democracy in Latin America? Some Evidence from Surveys of Public Opinion and Well Being
Authors: GRAHAM CAROL , SUKHTANKAR SANDIP 
Published: May 2004

The severe economic crisis facing several countries in the region over the last couple of years has led many observers to predict a backlash against market policies and even against democracy in the region. An economic crisis of such proportions should also, in theory, have negative effects on subjective well being. Our analysis, based on the Latinobarómetro surveys from 2000–2002, finds some unexpected positive trends, as well as notable differences between those countries that suffered from crises and those that did not. Satisfaction with market policies and with the way democracy is working has decreased among all groups except the very wealthy. In contrast, support for democracy as a system of government has increased, suggesting that respondents are increasingly distinguishing between democracy as a system of government, and the manner in which particular governments are performing. We also find evidence of changing attitudes towards redistributive taxation among the wealthy.JEL Codes. D63 (welfare economics, equity, justice, inequality); D84 (information and uncertainty, expectations); I31 (general welfare; basic needs; quality of life); J62 (mobility, unemployment, intergenerational mobility)
Aging in vertebrates, and the effect of caloric restriction: a mitochondrial free radical production–DNA damage mechanism?
Authors: Barja Gustavo 
Published: May 2004

ABSTRACTOxygen is toxic to aerobic animals because it is univalently reduced inside cells to oxygen free radicals. Studies dealing with the relationship between oxidative stress and aging in different vertebrate species and in caloric‐restricted rodents are discussed in this review. Healthy tissues mainly produce reactive oxygen species (ROS) at mitochondria. These ROS can damage cellular lipids, proteins and, most importantly, DNA. Although anti‐oxidants help to control this oxidative stress in cells in general, they do not decrease the rate of aging, because their concentrations are lower in long‐than in short‐lived animals and because increasing antioxidant levels does not increase vertebrate maximum longevity. However, long‐lived homeothermic vertebrates consistently have lower rates of mitochondrial ROS production and lower levels of steady‐state oxidative damage in their mitochondrial DNA than short‐lived ones. Caloric‐restricted rodents also show lower levels of these two key parameters than controls fed ad libitum. The decrease in mitochondrial ROS generation of the restricted animals has been recently localized at complex I and the mechanism involved is related to the degree of electronic reduction of the complex I ROS generator. Strikingly, the same site and mechanism have been found when comparing a long‐with a short‐lived animal species. It is suggested that a low rate of mitochondrial ROS generation extends lifespan both in long‐lived and in caloric‐restricted animals by determining the rate of oxidative attack and accumulation of somatic mutations in mitochondrial DNA.
The evolution of learning
Authors: Moore Bruce R. 
Published: May 2004

ABSTRACTMost processes or forms of learning have been treated almost as special creations, each as an independent process unrelated to others. This review offers an evolutionary cladogram linking nearly one hundred forms of learning and showing the paths through which they evolved.Many processes have multiple forms. There are at least five imprinting processes, eleven varieties of Pavlovian conditioning, ten of instrumental conditioning, and eight forms of mimicry and imitation.Song learning evolved independently in at least six groups of animals, and movement imitation in three (great apes, cetaceans and psittacine birds). The cladogram also involves at least eight new processes: abstract concept formation, percussive mimicry, cross‐modal imitation, apo‐conditioning, hybrid conditioning, proto‐pantomime, prosodic mimicry, and image‐mediated learning.At least eight of the processes evolved from more than one source. Multiple sources are of course consistent with modern evolutionary theory, as seen in some obligate symbionts, and gene‐swapping organisms. Song learning is believed to have evolved from two processes: auditory imprinting and skill learning. Many single words evolved from three sources: vocal mimicry, discrimination learning, and abstract concept formation.
The evolution of arthropod limbs
Authors: Boxshall Geoff A. 
Published: May 2004

ABSTRACTLimb morphology across the arthropods is reviewed using external morphological and internal anatomical data from both recent and fossil arthropods. Evolutionary trends in limb structure are identified primarily by reference to the more rigorous of the many existing phylogenetic schemes, but no major new phylogenetic inferences are presented. Tagmosis patterns are not considered, although the origins and patterns of heteronomy within the postantennulary limb series are analysed.The phenomenon of annulation is examined and two basic types of annuli are recognised: terminal and intercalary. The annulation of the apical segment of a limb results in the formation of terminal flagella, and is typical of primarily sensory appendages such as insect and malacostracan antennules and maxillary palps of some hexapods. Intercalary annulation, arising by subdivision of existing subterminal segments, is common, particularly in the tarsal region of arthropodan walking limbs. Differentiating between segments and annuli is discussed and is recognised as a limiting factor in the interpretation of fossils, which usually lack information on intrinsic musculature, and in the construction of groundplans. Rare examples of secondary segmentation, where the criteria for distinguishing between segments and annuli fail, are also highlighted.The basic crown‐group arthropodan limb is identified as tripartite, comprising protopodite, telopodite and exopodite, and the basic segmentation patterns of each of these parts are hypothesised. Possible criteria are discussed that can be used for establishing the boundary between protopodite and telopodite in limbs that are uniramous through loss of the exopodite. The subdivision of the protopodite, which is typical of the postantennulary limbs of mandibulates, is examined. The difficulties resulting from the partial or complete failure of expression of articulations within the mandibulate protopodite and subsequent incorporation of partial proto‐podal segments into the body wall, are also discussed. The development and homology between the various exites, including gills, on the postantennulary limbs of arthropods are considered in some detail, and the question of the possible homology between crustacean gills and insect wings is critically addressed.The hypothesis that there are only two basic limb types in arthropods, antennules and postantennulary limbs, is proposed and its apparent contradiction by the transformation of antennules into walking limbs by homeotic mutation is discussed with respect to the appropriate level of serial homology between these limbs.
Monogamy in marine fishes
Authors: Whiteman E. A. , Côté I. M. 
Published: May 2004

ABSTRACTThe formation of long‐term pair bonds in marine fish has elicited much empirical study. However, the evolutionary mechanisms involved remain contested and previous theoretical frameworks developed to explain monogamy in birds and mammals are not applicable to many cases of monogamy in marine fish. In this review, we summarise all reported occurrences of social monogamy in marine fish, which has so far been observed in 18 fish families. We test quantitatively the role of ecological and behavioural traits previously suggested to be important for the evolution of monogamy and show that monogamous species occur primarily in the tropics and are associated with coral reef environments in which territory defence and site attachment is facilitated. However, there is little evidence that obligately monogamous species are smaller in body size than species that can adopt a polygynous mating system. We review the evidence pertaining to six hypotheses suggested for the evolution of monogamous pair bonds: (1)biparental care, (2)habitat limitation, (3)low population density/low mate availability/low mobility, (4)increased reproductive efficiency, (5)territory defence, and (6)net benefit of single mate sequestration. We outline predictions and associated empirical tests that can distinguish between these hypotheses, and assess how generally each hypothesis explains monogamy within and between breeding periods for species with different types of territories (i.e. feeding only or feeding and breeding). Hypotheses (1) and (2)have limited applicability to marine fishes, while hypotheses (3)–(5) have little empirical support beyond the species for which they were designed. However, the role of paternal care in promoting monogamous pair bonds is not explicit in these hypotheses, yet paternal care has been reported in more than 70 monogamous marine fish. We show that paternal care may act to increase the likelihood of monogamy in combination with each of the proposed hypotheses through decreased bene fits to males from searching for additional mates or increased advantages to females from sequestering a single high‐quality mate. Among species defending breeding and feeding territories, the benefits, both within and between reproductive periods, of sequestering a single high‐quality mate (hypothesis 6)appear to be the best explanation for socially monogamous pairs. For species without parental care (i.e. holding only feeding territories), territory defence (hypothesis 5) in combination with the benefits of guarding a large mate (hypothesis 6) could potentially explain most instances of monogamy. Empirical studies of marine fishes over the past two decades are therefore slowly changing the view of monogamy from a mating system imposed upon species by environmental constraints to one with direct benefits to both sexes.
Metabolic responses to low temperature in fish muscle
Authors: Guderley Helga 
Published: May 2004

ABSTRACTFor most fish, body temperature is very close to that of the habitat. The diversity of thermal habitats exploited by fish as well as their capacity to adapt to thermal change makes them excellent organisms in which to examine the evolutionary and phenotypic responses to temperature. An extensive literature links cold temperatures with enhanced oxidative capacities in fish tissues, particularly skeletal muscle. Closer examination of inter‐species comparisons (i.e. the evolutionary perspective) indicates that the proportion of muscle fibres occupied by mitochondria increases at low temperatures, most clearly in moderately active demersal species. Isolated muscle mitochondria show no compensation of protein‐specific rates of substrate oxidation during evolutionary adaptation to cold temperatures. During phenotypic cold acclimation, mitochondrial volume density increases in oxidative muscle of some species (striped bass Morone saxatilis, crucian carp Carassius carassius), but remains stable in others (rainbow trout Oncorhynchus mykiss). A role for the mitochondrial reticulum in distributing oxygen through the complex architecture of skeletal muscle fibres may explain mitochondrial proliferation. In rainbow trout, compensatory increases in the protein‐specific rates of mitochondrial substrate oxidation maintain constant capacities except at winter extremes. Changes in mitochondrial properties (membrane phospholipids, enzymatic complement and cristae densities) can enhance the oxidative capacity of muscle in the absence of changes in mitochondrial volume density. Changes in the unsaturation of membrane phospholipids are a direct response to temperature and occur in isolated cells. This fundamental response maintains the dynamic phase behaviour of the membrane and adjusts the rates of membrane processes. However, these adjustments may have deleterious consequences. For fish living at low temperatures, the increased polyunsaturation of mitochondrial membranes should raise rates of mitochondrial respiration which would in turn enhance the formation of reactive oxygen species (ROS), increase proton leak and favour peroxidation of these membranes. Minimisation of mitochondrial oxidative capacities in organisms living at low temperatures would reduce such damage.
Cellulose microfibril angle in the cell wall of wood fibres
Authors: Barnett J. R. , Bonham Victoria A. 
Published: May 2004

ABSTRACTThe term microfibril angle (MFA) in wood science refers to the angle between the direction of the helical windings of cellulose microfibrils in the secondary cell wall of fibres and tracheids and the long axis of cell. Technologically, it is usually applied to the orientation of cellulose microfibrils in the S2 layer that makes up the greatest proportion of the wall thickness, since it is this which most affects the physical properties of wood. This review describes the organisation of the cellulose component of the secondary wall of fibres and tracheids and the various methods that have been used for the measurement of MFA. It considers the variation of MFA within the tree and the biological reason for the large differences found between juvenile (or core) wood and mature (or outer) wood. The ability of the tree to vary MFA in response to environmental stress, particularly in reaction wood, is also described.Differences in MFA have a profound effect on the properties of wood, in particular its stiffness. The large MFA in juvenile wood confers low stiffness and gives the sapling the flexibility it needs to survive high winds without breaking. It also means, however, that timber containing a high proportion of juvenile wood is unsuitable for use as high‐grade structural timber. This fact has taken on increasing importance in view of the trend in forestry towards short rotation cropping of fast grown species. These trees at harvest may contain 50% or more of timber with low stiffness and therefore, low economic value. Although they are presently grown mainly for pulp, pressure for increased timber production means that ways will be sought to improve the quality of their timber by reducing juvenile wood MFA.The mechanism by which the orientation of microfibril deposition is controlled is still a matter of debate. However, the application of molecular techniques is likely to enable modification of this process. The extent to which these techniques should be used to improve timber quality by reducing MFA in juvenile wood is, however, uncertain, since care must be taken to avoid compromising the safety of the tree.