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“Social functioning and use of rehabilitation resources in a group of people who experienced a first episode of psychosis and participated in a psychotherapeutic group program versus a control group”
- A. Oliva Lozano, J. Garde Gonzalez, P. Herrero Ortega, A. Muñoz-Sanjosé, Á. Palao-Tarrero, M. P. Vidal-Villegas, R. Mediavilla, P. Tarín Garrón, J. M. Pastor-Haro, Á. De Diego Gómez-Cornejo, M. F. Bravo-Ortiz, O. B. O. A.-M. Group
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- Journal:
- European Psychiatry / Volume 66 / Issue S1 / March 2023
- Published online by Cambridge University Press:
- 19 July 2023, p. S185
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Introduction
Psychotic disorders have a huge impact on social functioning, which is the ability to stablish and maintain social activities such as interpersonal relationships and self-care activities of daily living. Research data support that the early intervention in people who have experienced a first episode of psychosis (FEP) -based on a multidisciplinary treatment including both psychopharmacological and psychosocial treatments-, has a relevant role in a favorable evolution. AGES-Mind study is based on manualized psychotherapeutic interventions for people with first-psychosis episodes.
ObjectivesTo describe the use of rehabilitation resources and social functioning in a group of people with FEP who were included in a psychotherapeutic group program versus a control group, at 12 and 24 months since the beginning of the intervention.
MethodsLongitudinal, analytical, observational, retrospective study on a cohort of 46 patients with first-episode psychosis within the last 5 years. 23 patients received group psychotherapy in the context of the AGES-Mind study and they were compared with 23 control patients who did not receive a group intervention (treatment as usual). Controls were matched by age, gender and time elapsed since the first episode of psychosis with those exposed to the intervention. Sociodemographic data, social functioning (self-care, social activities, social relationships, and behavior) and use of rehabilitation resources outcome variables were assessed.
ResultsSignificant differences were found regarding participation in social activities in the intervention group versus control group at 24 months. No significant differences were found in other dimensions of social functioning or in the use of rehabilitation resources.
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ConclusionsFurther studies with larger sample sizes are needed in order to determine if the participation in group therapy leads to an improvement in social functioning and use of rehabilitation resources for people who have experienced a first episode of psychosis.
Disclosure of InterestNone Declared
Perioperative stress response in dogs undergoing elective surgery: variations in behavioural, neuroendocrine, immune and acute phase responses
- C Siracusa, X Manteca, J Cerón, S Martínez-Subiela, R Cuenca, S Lavín, F Garcia, J Pastor
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- Journal:
- Animal Welfare / Volume 17 / Issue 3 / August 2008
- Published online by Cambridge University Press:
- 11 January 2023, pp. 259-273
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The aim of this trial was to describe the behavioural, neuroendocrine, immune and acute phase stress responses in dogs undergoing elective surgery in normal, clinical practice conditions. Sixteen dogs were submitted to elective orchiectomy or ovariohysterectomy using a standardised surgical protocol. Each animal was confined to the Intensive Care Unit during pre- and post-surgery and perioperative behavioural, neuroendocrine, immune and acute phase responses were studied. Behavioural categories, cortisol, prolactin, white blood cell, C-reactive protein and haptoglobin variation were evaluated. Values at different times were compared with basal values shown by the dog in its usual environment. Communicative and explorative behaviours showed high occurrence pre-surgery and were inhibited post-surgery. Decreases in post-surgery activity, interactive behaviours and changes in waking/sleeping patterns were observed. The most sensitive marker of psychological stress, cortisol, in comparison with basal values, showed a significant increase both during pre- and post-surgery confinement in the ICU cage. Prolactin values were characterised by a significant decrease early into the post-surgery period. The immune response was characterised by long-term neutrophilia and monocytosis, but by short-term lymphopaenia and eosinopaenia, limited to the early post-operative period. With regard to the acute phase response, both C-reactive protein and haptoglobin showed a long-term increase, post-surgery. Changes in behavioural, haematological and biochemical markers showed that perioperative stress represents a major challenge to dog welfare.
Peripheral endocannabinoids in eating disorders and obesity and its relationship with clinical and anthropometric variables
- I. Baenas-Soto, R. Miranda-Olivos, L. Vos, R. Granero, I. Sánchez, N. Riesco, A. Del Pino-Gutiérrez, E. Codina, J. A. Fernández-Formoso, N. Vilarrasa, N. Virgili, R. Lopez-Urdiales, A. Pastor, R. De La Torrre, S. Jimenez-Murcia, C. Soriano-Mas, F. Fernandez-Aranda
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- Journal:
- European Psychiatry / Volume 64 / Issue S1 / April 2021
- Published online by Cambridge University Press:
- 13 August 2021, p. S115
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Introduction
Anandamide (AEA) and 2-Arachidonoylglycerol (2-AG) play a pivotal role in food intake and reward aspects of feeding. Aberrant functioning in the endocannabinoid system has been observed in patients with eating disorders (EDs). This dysfunction may influence the incentive processes stimulating behaviors towards food acquisition or the hedonic evaluation of ingested food.
ObjectivesThe aims of this study are to compare fasting peripheral levels of AEA and 2-AG in ED patients, obese subjects (OB) and healthy controls (HCs), and to explore their association with clinical and anthropometric variables.
MethodsThe sample included a total of 63 adult women. Peripheral blood samples were collected to investigate fasting levels of AEA and 2-AG in 31 ED patients: 22 Anorexia Nervosa (AN) and 9 Binge Eating Disorder (BED), compared to 21 OB and 11 HCs. Several clinical and anthropometric variables were also assessed.
ResultsComparing groups, significant differences in AEA levels were found (p=0.001). Specifically, individuals with AN exhibited lower AEA than OB (p<0.001) and BED (p=0.007), while OB showed higher AEA than HCs (p=0.015). 2-AG was positively correlated with hostility dimension in EDs and negatively associated with impulsive traits in OB. AEA showed a direct association with body dissatisfaction in AN, contrary to OB. Finally, in AN, AEA negatively correlated with the body mass index, while 2-AG was positively associated with the fat mass.
ConclusionsThese results suggest an interaction between biological and clinical factors defining a vulnerability pathway that could help fitting personalized therapeutic approaches in each condition.
DisclosureNo significant relationships.
Relationship between positive symptoms and anxiety sensitivity in psychosis: A research centered on the symptom
- V. Sanz-Largo, F. Rivas-Marîn, J. Pastor-Morales, E. Castillo-Gordillo, E. Fernândez-Jiménez
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- European Psychiatry / Volume 26 / Issue S2 / March 2011
- Published online by Cambridge University Press:
- 16 April 2020, p. 1499
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Introduction
Researching from a symptom approach avoids possible spurious associations, given the co-occurrence of symptoms in a disorder (Costello, 1992). Here, we deepen the evidenced relationships among anxiety, delusions and hallucinations.
ObjectivesWe intended to assess differences in Anxiety Sensitivity dimensions between patients with psychosis depending on presence/absence of hallucinations and/or delusions.
Methods/ participants49 patients with DSM psychosis diagnosis (42 men and 7 women; mean age: 40), who attended a Mental Health Rehabilitation Service in 2008, of whom 7 only deluded, 6 only hallucinated, 11 deluded-hallucinated and the remaining 25 neither hallucinated nor deluded.
Design, materials and procedureA Cross-sectional design (one measurement) for a co-relational method of comparison between groups.
We used the Spanish validated Anxiety Sensitivity lndex-3 -ASI 3- (Sandín et al., 2007), a 18-item Likert self-report that assesses fears of anxious symptoms. It presents a hierarchical structure (a general factor and three subscales -Physical, Cognitive and Social Concerns-). It's also used the first and third items (delusions and hallucinatory behaviour) of The Positive and Negative Syndrome Scale -PANSS- (Kay, Opler and Lindenmayer, 1988) to detect positive symptoms.
ResultsAll analysis were accepted at p < .05. Patients only hallucinators showed a higher anxiety sensitivity in Social Subscale than non-hallucinative/non-delusional patients; the former presented lower punctuations in ASI-total and ASI-cognitive than patients with hallucinations and delusions. The latter showed a higher anxiety sensitivity in Cognitive Subscale than patients who only deluded.
ConclusionsIt's hypothetized that both delusional and hallucinative activity is necessary for emergence of cognitive anxiety sensitivity.
Anxiety sensitivity depending on presence of positive symptoms in psychosis
- E. Fernândez-Jiménez, J. Pastor-Morales, V. Sanz-Largo, E. Castillo-Gordillo, F. Rivas-Marîn
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- European Psychiatry / Volume 26 / Issue S2 / March 2011
- Published online by Cambridge University Press:
- 16 April 2020, p. 1383
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Introduction
An important corpus of scientist evidence is linking psychotic activity and anxiety-related processes (Freeman and Garety, 2003).
ObjectivesWe intended to assess differences in Anxiety Sensitivity dimensions between patients diagnosed by psychosis with and without positive symptoms.
MethodsParticipants: 49 patients with DSM psychosis diagnosis (42 men and 7 women; mean age: 40), who attended a Mental Health Rehabilitation Service in 2008, of whom 24 patients had positive symptomatology.
Design, materials and procedure: A Cross-sectional design (one measurement) for a co-relational method of comparison between groups.
We used the Spanish validated Anxiety Sensitivity lndex-3 -ASI 3- (Sandîn et al, 2007), a 18-item Likert self-report that assesses fears of anxious symptoms. It presents a hierarchical structure (a general factor and three subscales -Physical, Cognitive and Social Concerns-). It's also used the first and third items (delusions and hallucinatory behaviour) of The Positive and Negative Syndrome Scale -PANSS- (Kay, Opler and Lindenmayer, 1988) to detect positive symptoms.
ResultsPatients with positive symptoms showed a higher sensitivity to cognitive (z = -3.22, p < 0.01) and social anxiety (z = -2.66, p < 0.01), as well as higher punctuations in ASI-total (z = -2.91, p < 0.01), than patients without positive symptoms.
ConclusionsPatients with positive symptoms show significant fears of symptoms of different anxious domains (ASI-total) with regard to patients without this kind of symptomatology. Specially, they are worried about the possibility that concentration difficulties and restlessness lead to mental incapacitation (ASI-cognitive) and about social reactions before their own publicly observable anxiety manifestations (ASI-social).
Anxiety sensitivity in patients with psychosis regarding a non-clinical sample
- J. Pastor-Morales, E. Castillo-Gordillo, E. Fernández-Jiménez, F. Rivas-Marín, V. Sanz-Largo
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- European Psychiatry / Volume 26 / Issue S2 / March 2011
- Published online by Cambridge University Press:
- 16 April 2020, p. 1470
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Introduction
There is increasing empirical evidence that links the classical separated psychopathological spectrums neurosis and psychosis. In this sense, anxiety is a factor for delusional/hallucinative development and maintenance (Freeman and Garety, 2003).
ObjectivesWe intended to assess differences in Anxiety Sensitivity dimensions between patients with psychosis and a non-clinical sample.
MethodsParticipants: 49 patients with DSM psychosis diagnosis (42 men and 7 women; mean age: 40), who attended a Mental Health Rehabilitation Service in 2008, were compared with a non-clinical sample (n = 582) from another study (Sandín, Valiente, Chorot and Santed, 2007).
Design, materials and procedureA Cross-sectional design (one measurement) for a co-relational method of comparison between groups.
We used the Spanish validated Anxiety Sensitivity Index-3 -ASI 3- (Sandín et al., 2007), a 18-item Likert self-report that assesses fears of anxious symptoms. It presents a hierarchical structure (a general factor and three subscales -Physical, Cognitive and Social Concerns-). It's also used the first and third items (delusions and hallucinatory behaviour) of The Positive and Negative Syndrome Scale -PANSS- (Kay, Opler and Lindenmayer, 1988) to detect positive symptoms.
ResultsPatients present a higher anxiety sensitivity in the General Factor (t = 2.06, p < 0.05) and Cognitive Subscale (t = 3.91, p < 0.001) than nonpatient sample.
ConclusionsPatients with psychosis show significant fears of symptoms of different anxious domains (ASI-total) regarding a non-clinical sample. Particularly, they are worried about the possibility that concentration difficulties and restlessness lead to mental incapacitation (ASI-cognitive).
Genetic association between −93A/G polymorphism in the Fyn kinase gene and alcohol dependence in Spanish men
- Isabel J. Pastor, F. Javier Laso, Sandra Inés, Miguel Marcos, Rogelio González-Sarmiento
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- European Psychiatry / Volume 24 / Issue 3 / April 2009
- Published online by Cambridge University Press:
- 16 April 2020, pp. 191-194
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Background
Fyn tyrosine kinase is a member of the Scr family that phosphorylates the NR2A and NR2B subunits of the NMDA receptors reducing the inhibitory effects of ethanol and therefore may regulate the individual sensitivity to ethanol.
ObjectivesTo investigate whether there is any relationship between the polymorphism at position −93 of the Fyn kinase gene and the susceptibility to develop alcoholism.
MethodsWe studied the distribution of genotypes and alleles of the polymorphism −93A/G (137346 T/C) in the 5′ UTR region of the fyn gene in 207 male heavy drinkers (119 with alcohol dependence and 88 with alcohol abuse) and 100 control subjects from Castilla y León (Spain).
ResultsThe frequency of G allele carriers was higher in alcohol dependents than in alcohol abusers (47.9% vs 30.6%; p = 0.015; OR = 2.077; 95% CI 1.165–3.704).
ConclusionOur results show that the −93G allele of Fyn kinase gene is associated with higher risk to develop alcohol dependence in Spanish men.
Experiential avoidance versus acceptance: Differentiating between primary and secondary disturbances in rational-emotive behavior therapy
- E. Fernández-Jiménez, E. Castillo-Gordillo, J. Pastor-Morales, V. Sanz-Largo, F. Rivas-Marín
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- European Psychiatry / Volume 26 / Issue S2 / March 2011
- Published online by Cambridge University Press:
- 16 April 2020, p. 1306
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Introduction
Albert Ellis’ Rational Therapy, founded in 1955, evolved into Rational-Emotive Therapy (RET) in 1959; and finally as Rational-Emotive Behavior Therapy (REBT) in 1992. This evolution has showed, much more, its resemblance to Acceptance and Commitment Therapy (ACT) (Ellis, 2005). REBT highlights treatment of secondary disturbances (berating oneself for having symptoms), beyond primary ones (nosographical symptoms), because these are ways of control and experiential avoidance which foster suffering.
ObjectivesTo treat primary anxiety in a patient reducing his secondary disturbance through TREC.
MethodsParticipants: A 40-year-old man diagnosed with Panic Disorder who attended a Public Mental Health Service. He was being treated with Alprazolam y Lorazepam, which he has taken before psychotherapy.
Design, materials and procedure: It's implemented a single-subject AB design during 4 months (7 therapeutic sessions). It's applied a weekly self-report to record panic attack frequency and variations in anxiolytics-taken. C Young (p < 0.01) was used for statistical analysis of data and the method of least squares to obtain trend line. 16 measures were registered at a weekly interval.
ResultsSignificant declining trends are observed in panic attack frequency (C = .750, Zo = 3.201, Zt = 2.240), and collaterally in anxiolytics-taking (Alprazolam: C = .811, Zo = 3.462, Zt = 2.240; Lorazepam: C = .801, Zo = 3.420, Zt = 2.240) from beginning of therapy.
ConclusionsTechniques targeting symptoms-extirpation induced intolerance and self condemnation feelings when patient didn’t achieve the wanted control (as way of destructive experiential avoidance -Luciano and Hayes, 2001). Treating these feelings (secondary disturbance), based on symptomatology acceptance (Ellis, 2005), decreased distress related to panic attacks and paroxysmal crisis frequency itself.
A genetic variant in the microRNA-146a gene is associated with susceptibility to alcohol use disorders
- I. Novo-Veleiro, R. González-Sarmiento, C. Cieza-Borrella, I. Pastor, F.-J. Laso, M. Marcos
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- European Psychiatry / Volume 29 / Issue 5 / June 2014
- Published online by Cambridge University Press:
- 15 April 2020, pp. 288-292
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Background:
Polymorphisms in the microRNA (miRNA) regulatory pathways are novel functional genetic variants whose association with alcoholism susceptibility has not been previously studied. Given the potential relationship between certain miRNAs and alcohol use disorders (AUDs), this study was designed to explore the association between two polymorphisms within hsa-miR-146a and hsa-miR-196a2 genes and susceptibility to these diseases.
Methods:Three hundred and one male patients with AUDs and 156 sex-matched healthy volunteers were enrolled. Polymorphisms were genotyped using TaqMan® PCR assays. Allele and genotype frequencies were compared between groups and logistic regression analysis was also performed to analyze the model of inheritance.
Results:There was a significantly higher prevalence of allele C carriers (47.8%) of the miR-146a G>C polymorphism (rs2910164) among patients with AUDs when compared with controls (35.9%), and multivariable logistic regression analysis showed that the C allele was associated with these AUDs (OR = 1.615, 95% CI 1.067–2.442; P = 0.023). Neither the genotype nor the allele distribution of miR-196a2 polymorphism (rs11614913) was significantly different between groups.
Conclusions:This is the first genetic association study to explore the relationship of miRNA polymorphisms with AUDs and to show an association of the miR-146a C>G rs2910164 allelic variant with this disease.
Differences in plasma concentration of acylethanolanydes and acylglycerols in paired samples of bipolar patients and first- and second-degree relatives
- P. Romero-Sanchiz, J. Guzman-Parra, F. Mayoral-Cleríes, F. Rivas-Guerrero, P. Araos-Gómez, M. Pedraz-Fernández, A. Serrano-Criado, F.J. Pavón-Morón, R. De la Torre-Fornell, A. Pastor-Bosch, F. Rodríguez de Fonseca
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- European Psychiatry / Volume 33 / Issue S1 / March 2016
- Published online by Cambridge University Press:
- 23 March 2020, p. S340
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Introduction
Endocannabinoid System (ECS) has been highlighted as one of the most relevant research topics by neurobiologists, pharmacists, basic scientists and clinicians (Skaper and Di Marzo, 2012). Recent work has associated major depressive disorder with the ECS (Ashton and Moore, 2011). Despite the close relationship between depression and bipolar disorders, as far as we know, there is no characterization of ECS and congeners in a sample of patients with bipolar disorders.
Aims and objectivesThe objective of this work is to characterize the plasma levels of endocannabinoids and congeners in a sample of patients with bipolar disorders.
MethodThe clinical group was composed by 19 patients with a diagnosis of bipolar disorders using SCID-IV (First et al., 1999). The control group was formed by 18 relatives of first- or second-degree of the patients.
The following endocannabinoids and congeners were quantified: N-palmitoleoylethanolamide (POEA), N-palmitolylethanolamide (PEA), N-oleoylethanolamide (OEA), N-stearoylethanolamide (SEA), N-arachidonoylethanolamide (AEA), N-dihomo-γ-linolenoylethanolamide (DGLEA), N-docosatetraenoylethanolamide (DEA), N-linoleoylethanolamide (LEA), N-docosahexaenoylethanolamide (DHEA), 2-arachidonoylglycerol (2-AG), 2-linoleoylglycerol (2-LG), and 2-oleoylglycerol (2-OG).
ResultsThe result showed statistically significant lower levels of AEA, DEA and DHEA in clinical sample. Previous research also identified lower levels of AEA in depressed women (Hill et al., 2008, 2009). Until date, it is unknown if DEA and DHEA have some effect on EC receptors, and whether they have some direct effects on endocannabinoids.
ConclusionsIt would be necessary to carry our other research with a larger sample, which could allow the control of potential confounding variables.
Disclosure of interestThe authors have not supplied their declaration of competing interest.
A NEW SPECIES OF OOCEPHALUS (LAMIACEAE) FROM GOIÁS, BRAZIL
- A. S. Soares, R. M. Harley, J. F. B. Pastore, J. G. Jardim
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- Edinburgh Journal of Botany / Volume 76 / Issue 3 / November 2019
- Published online by Cambridge University Press:
- 17 June 2019, pp. 403-409
- Print publication:
- November 2019
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A new species, Oocephalus pubescens A.Soares & Harley, from Chapada dos Veadeiros, Goiás, Brazil, is described and illustrated. The characteristics that distinguish it from a similar taxon, Oocephalus foliosus, are listed, and comments on its distribution and an occurrence map are provided.
Crystal structure of coalingite
- J. Pastor-Rodriguez, H. F. W. Taylor
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- Journal:
- Mineralogical Magazine / Volume 38 / Issue 295 / September 1971
- Published online by Cambridge University Press:
- 05 July 2018, pp. 286-294
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The crystal structure of coalingite (Mg10Fe2(OH)24(CO3)·2H2O) has been determined using single-crystal X-ray methods. The mineral is trigonal, with space group Rm, aH = 3·12, cH = 37·4 Å, Z = ½, and (0001) cleavage. The structure is of a layer type, and is based on a structural element about 12·5 Å thick in the c-direction and consisting of two brucite-like layers and one disordered layer containing carbonate ions and water molecules and resembling those in sjögrenite and pyroaurite. The unit cell comprises three of these structural elements stacked together in the c-direction. The Mg2+ and Fe3+ ions are randomly distributed among all the octahedral sites of the brucite-like layers. The structure closely resembles those of sjögrenite and pyroaurite, but has two brucite-like layers between each CO32−−H2O layer where these have one. There is a tendency to random interstratification, and the crystals appear to contain intergrown regions of brucite and of sjögrenite or pyroaurite. Coalingite-K probably has a similar structure, but with three brucite-like layers between each -H2O layer; its idealized formula is probably Mg16Fe2(OH)36(CO3).2H2O.
Predictors of treatment dropout in self-guided web-based interventions for depression: an ‘individual patient data’ meta-analysis
- E. Karyotaki, A. Kleiboer, F. Smit, D. T. Turner, A. M. Pastor, G. Andersson, T. Berger, C. Botella, J. M. Breton, P. Carlbring, H. Christensen, E. de Graaf, K. Griffiths, T. Donker, L. Farrer, M. J. H. Huibers, J. Lenndin, A. Mackinnon, B. Meyer, S. Moritz, H. Riper, V. Spek, K. Vernmark, P. Cuijpers
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- Journal:
- Psychological Medicine / Volume 45 / Issue 13 / October 2015
- Published online by Cambridge University Press:
- 17 April 2015, pp. 2717-2726
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Background
It is well known that web-based interventions can be effective treatments for depression. However, dropout rates in web-based interventions are typically high, especially in self-guided web-based interventions. Rigorous empirical evidence regarding factors influencing dropout in self-guided web-based interventions is lacking due to small study sample sizes. In this paper we examined predictors of dropout in an individual patient data meta-analysis to gain a better understanding of who may benefit from these interventions.
MethodA comprehensive literature search for all randomized controlled trials (RCTs) of psychotherapy for adults with depression from 2006 to January 2013 was conducted. Next, we approached authors to collect the primary data of the selected studies. Predictors of dropout, such as socio-demographic, clinical, and intervention characteristics were examined.
ResultsData from 2705 participants across ten RCTs of self-guided web-based interventions for depression were analysed. The multivariate analysis indicated that male gender [relative risk (RR) 1.08], lower educational level (primary education, RR 1.26) and co-morbid anxiety symptoms (RR 1.18) significantly increased the risk of dropping out, while for every additional 4 years of age, the risk of dropping out significantly decreased (RR 0.94).
ConclusionsDropout can be predicted by several variables and is not randomly distributed. This knowledge may inform tailoring of online self-help interventions to prevent dropout in identified groups at risk.
Artificial long days increase milk production in subtropical lactating goats managed under extensive grazing conditions
- M. J. FLORES, J. A. DELGADILLO, J. A. FLORES, F. J. PASTOR, G. DUARTE, J. VIELMA, H. HERNÁNDEZ
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- The Journal of Agricultural Science / Volume 153 / Issue 2 / March 2015
- Published online by Cambridge University Press:
- 25 April 2014, pp. 335-342
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The objective of the current study was to determine whether exposure to an artificial long-day photoperiod increases milk production in subtropical goats maintained under extensive grazing conditions, with or without the presence of a nutritional supplement. Forty-four lactating goats were exposed to a natural photoperiod (11 h light) with nutritional supplementation (NDS; natural day supplemented group; n=11) or without nutritional supplementation (NDN; natural day non-supplemented group; n=11) or to an artificial long-day photoperiod (16 h light) with nutritional supplementation (LDS; long-day supplemented group; n=11) or without nutritional supplementation (LDN; long-day non-supplemented group; n=11). Daily nutritional supplementation consisted of a mixture of 300 g rolled maize and 200 g soya bean per animal. During the suckling phase, milk yield was assessed at 10 and 20 days lactation and thereafter every 10 days up to 110 days lactation from day 40 of lactation. Plasma insulin-like growth factor 1 (IGF-I) concentration was determined at 20, 40, 60, 80 and 100 days of lactation. Mean milk yield was greater in goats from the LDN group than the NDN group. The difference in mean milk yield was greater when goats received a nutritional supplement. With nutritional supplementation, the plasma IGF-I concentrations were greater in goats exposed to long days than in those maintained under natural photoperiod. However, IGF-I concentrations were lower with long days when goats were not supplemented. In conclusion, exposure to an artificial long-day photoperiod increases milk yield in subtropical lactating goats maintained under extensive grazing conditions, and this increased milk production is more pronounced with a nutritional supplement. Furthermore, depending on nutritional status, exposure to artificial long days increases plasma IGF-I concentration in lactating goats.
Finite Element Simulation of Steel Quench Distortion- Parametric Analysis of Processing Variables
- F. A. García-Pastor, R.D. López-García, E. Alfaro-López, M. J. Castro-Román
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- Journal:
- MRS Online Proceedings Library Archive / Volume 1485 / 2012
- Published online by Cambridge University Press:
- 28 February 2013, pp. 29-34
- Print publication:
- 2012
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Steel quenching from the austenite region is a widely used industrial process to increase strength and hardness through the martensitic transformation. It is well known, however, that it is very likely that macroscopic distortion occurs during the quenching process. This distortion is caused by the rapidly varying internal stress fields, which may change sign between tension and compression several times during quenching. If the maximum internal stress is greater than the yield stress at given processing temperature, plastic deformation will occur and, depending on its magnitude, macroscopic distortion may become apparent.
The complex interaction between thermal contraction and the expansion resulting from the martensitic transformation is behind the sign changes in the internal stress fields. Variations in the steel composition and cooling rate will result in a number of different paths, which the internal stresses will follow during processing. Depending on the route followed, the martensitic transformation may hinder the thermal stresses evolution to the point where the stress fields throughout the component may actually be reverted. A different path may support the thermal stresses evolution further increasing their magnitude. The cross-sectional area also affects the internal stresses magnitude, since smaller areas will have further trouble to accommodate stress, thus increasing the distortion. Additionally, the bainitic transformation occurring during relatively slow cooling rates may have an important effect in the final stress field state.
A finite-element (FE) model of steel quenching has been developed in the DEFORM 3D simulation environment. This model has taken into account the kinetics of both austenite-bainite and austenite-martensite transformations in a simplified leaf spring geometry. The results are discussed in terms of the optimal processing parameters obtained by the simulation against the limitations in current industrial practice.
Contributors
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- By Rose Teteki Abbey, K. C. Abraham, David Tuesday Adamo, LeRoy H. Aden, Efrain Agosto, Victor Aguilan, Gillian T. W. Ahlgren, Charanjit Kaur AjitSingh, Dorothy B E A Akoto, Giuseppe Alberigo, Daniel E. Albrecht, Ruth Albrecht, Daniel O. Aleshire, Urs Altermatt, Anand Amaladass, Michael Amaladoss, James N. Amanze, Lesley G. Anderson, Thomas C. Anderson, Victor Anderson, Hope S. Antone, María Pilar Aquino, Paula Arai, Victorio Araya Guillén, S. Wesley Ariarajah, Ellen T. Armour, Brett Gregory Armstrong, Atsuhiro Asano, Naim Stifan Ateek, Mahmoud Ayoub, John Alembillah Azumah, Mercedes L. García Bachmann, Irena Backus, J. Wayne Baker, Mieke Bal, Lewis V. Baldwin, William Barbieri, António Barbosa da Silva, David Basinger, Bolaji Olukemi Bateye, Oswald Bayer, Daniel H. Bays, Rosalie Beck, Nancy Elizabeth Bedford, Guy-Thomas Bedouelle, Chorbishop Seely Beggiani, Wolfgang Behringer, Christopher M. Bellitto, Byard Bennett, Harold V. Bennett, Teresa Berger, Miguel A. Bernad, Henley Bernard, Alan E. Bernstein, Jon L. Berquist, Johannes Beutler, Ana María Bidegain, Matthew P. Binkewicz, Jennifer Bird, Joseph Blenkinsopp, Dmytro Bondarenko, Paulo Bonfatti, Riet en Pim Bons-Storm, Jessica A. Boon, Marcus J. Borg, Mark Bosco, Peter C. Bouteneff, François Bovon, William D. Bowman, Paul S. Boyer, David Brakke, Richard E. Brantley, Marcus Braybrooke, Ian Breward, Ênio José da Costa Brito, Jewel Spears Brooker, Johannes Brosseder, Nicholas Canfield Read Brown, Robert F. Brown, Pamela K. Brubaker, Walter Brueggemann, Bishop Colin O. Buchanan, Stanley M. Burgess, Amy Nelson Burnett, J. Patout Burns, David B. Burrell, David Buttrick, James P. Byrd, Lavinia Byrne, Gerado Caetano, Marcos Caldas, Alkiviadis Calivas, William J. Callahan, Salvatore Calomino, Euan K. Cameron, William S. Campbell, Marcelo Ayres Camurça, Daniel F. Caner, Paul E. Capetz, Carlos F. Cardoza-Orlandi, Patrick W. Carey, Barbara Carvill, Hal Cauthron, Subhadra Mitra Channa, Mark D. Chapman, James H. Charlesworth, Kenneth R. Chase, Chen Zemin, Luciano Chianeque, Philip Chia Phin Yin, Francisca H. Chimhanda, Daniel Chiquete, John T. Chirban, Soobin Choi, Robert Choquette, Mita Choudhury, Gerald Christianson, John Chryssavgis, Sejong Chun, Esther Chung-Kim, Charles M. A. Clark, Elizabeth A. Clark, Sathianathan Clarke, Fred Cloud, John B. Cobb, W. Owen Cole, John A Coleman, John J. Collins, Sylvia Collins-Mayo, Paul K. Conkin, Beth A. Conklin, Sean Connolly, Demetrios J. Constantelos, Michael A. Conway, Paula M. Cooey, Austin Cooper, Michael L. Cooper-White, Pamela Cooper-White, L. William Countryman, Sérgio Coutinho, Pamela Couture, Shannon Craigo-Snell, James L. Crenshaw, David Crowner, Humberto Horacio Cucchetti, Lawrence S. Cunningham, Elizabeth Mason Currier, Emmanuel Cutrone, Mary L. Daniel, David D. Daniels, Robert Darden, Rolf Darge, Isaiah Dau, Jeffry C. Davis, Jane Dawson, Valentin Dedji, John W. de Gruchy, Paul DeHart, Wendy J. Deichmann Edwards, Miguel A. De La Torre, George E. Demacopoulos, Thomas de Mayo, Leah DeVun, Beatriz de Vasconcellos Dias, Dennis C. Dickerson, John M. Dillon, Luis Miguel Donatello, Igor Dorfmann-Lazarev, Susanna Drake, Jonathan A. Draper, N. Dreher Martin, Otto Dreydoppel, Angelyn Dries, A. J. Droge, Francis X. D'Sa, Marilyn Dunn, Nicole Wilkinson Duran, Rifaat Ebied, Mark J. Edwards, William H. Edwards, Leonard H. Ehrlich, Nancy L. Eiesland, Martin Elbel, J. Harold Ellens, Stephen Ellingson, Marvin M. Ellison, Robert Ellsberg, Jean Bethke Elshtain, Eldon Jay Epp, Peter C. Erb, Tassilo Erhardt, Maria Erling, Noel Leo Erskine, Gillian R. Evans, Virginia Fabella, Michael A. Fahey, Edward Farley, Margaret A. Farley, Wendy Farley, Robert Fastiggi, Seena Fazel, Duncan S. Ferguson, Helwar Figueroa, Paul Corby Finney, Kyriaki Karidoyanes FitzGerald, Thomas E. FitzGerald, John R. Fitzmier, Marie Therese Flanagan, Sabina Flanagan, Claude Flipo, Ronald B. Flowers, Carole Fontaine, David Ford, Mary Ford, Stephanie A. Ford, Jim Forest, William Franke, Robert M. Franklin, Ruth Franzén, Edward H. Friedman, Samuel Frouisou, Lorelei F. Fuchs, Jojo M. Fung, Inger Furseth, Richard R. Gaillardetz, Brandon Gallaher, China Galland, Mark Galli, Ismael García, Tharscisse Gatwa, Jean-Marie Gaudeul, Luis María Gavilanes del Castillo, Pavel L. Gavrilyuk, Volney P. Gay, Metropolitan Athanasios Geevargis, Kondothra M. George, Mary Gerhart, Simon Gikandi, Maurice Gilbert, Michael J. Gillgannon, Verónica Giménez Beliveau, Terryl Givens, Beth Glazier-McDonald, Philip Gleason, Menghun Goh, Brian Golding, Bishop Hilario M. Gomez, Michelle A. Gonzalez, Donald K. Gorrell, Roy Gottfried, Tamara Grdzelidze, Joel B. Green, Niels Henrik Gregersen, Cristina Grenholm, Herbert Griffiths, Eric W. Gritsch, Erich S. Gruen, Christoffer H. Grundmann, Paul H. Gundani, Jon P. Gunnemann, Petre Guran, Vidar L. Haanes, Jeremiah M. 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Yee, Viktor Yelensky, Yeo Khiok-Khng, Gustav K. K. Yeung, Angela Yiu, Amos Yong, Yong Ting Jin, You Bin, Youhanna Nessim Youssef, Eliana Yunes, Robert Michael Zaller, Valarie H. Ziegler, Barbara Brown Zikmund, Joyce Ann Zimmerman, Aurora Zlotnik, Zhuo Xinping
- Edited by Daniel Patte, Vanderbilt University, Tennessee
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- Book:
- The Cambridge Dictionary of Christianity
- Published online:
- 05 August 2012
- Print publication:
- 20 September 2010, pp xi-xliv
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A cost-effective robotic solution for the cleaning of ships' hulls
- A. Iborra, J. A. Pastor, D. Alonso, B. Alvarez, F. J. Ortiz, P. J. Navarro, C. Fernández, J. Suardiaz
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Hull cleaning before repainting is a key operation in the maintenance of ships. For more than a decade, a means to improve this operation has been sought through robotization and the use of different techniques such as grit blasting and ultra high pressure water jetting. Despite this, it continues to be standard practice in shipyards that this process is carried out manually. This paper presents a family of robots that aims to offer important improvements to the process as well as satisfying, to a great extent, all the operative requirements of efficiency, security, and respect for the environment that shipyards nowadays demand. It is described the family of devices with emphasis on the mechanical design. This set consists of two vertical robotic towers and a robot climber. In addition, it is shown the control architecture of the global system. Finally, operative results are presented together with a comparison between the performance achieved in shipyards through the use of these robots and those obtained with a manual process.