Soil resource supply influences faunal size–specific distributions in natural food webs

The large range of body-mass values of soil organisms provides a tool to assess the ecological organization of soil communities. The goal of this paper is to identify graphical and quantitative indicators of soil community composition and ecosystem functioning, and to illustrate their application to real soil food webs. The relationships between log-transformed mass and abundance of soil organisms in 20 Dutch meadows and heathlands were investigated. Using principles of allometry, maximal use can be made of ecological theory to build and explain food webs. The aggregate contribution of small invertebrates such as nematodes to the entire community is high under low soil phosphorus content and causes shifts in the mass–abundance relationships and in the trophic structures. We show for the first time that the average of the trophic link lengths is a reliable predictor for assessing soil fertility responses. Ordered trophic link pairs suggest a self-organizing structure of food webs according to resource availability and can predict environmental shifts in ecologically meaningful ways

Disrupting the rhythm of depression using Mobile Cognitive Therapy for recurrent depression: randomized controlled trial design and protocol

Background: Major depressive disorder (MDD) is projected to rank second on a list of 15 major diseases in terms of burden in 2030. The major contribution of MDD to disability and health care costs is largely due to its highly recurrent nature. Accordingly, efforts to reduce the disabling effects of this chronic condition should shift to preventing recurrence, especially in patients at high risk of recurrence. Given its high prevalence and the fact that interventions are necessary during the remitted phase, new approaches are needed to prevent relapse in depression. Methods/design: The best established effective and available psychological intervention is cognitive therapy. However, it is costly and not available for most patients. Therefore, we will compare the effectiveness and cost-effectiveness of self-management supported by online CT accompanied by SMS based tele-monitoring of depressive symptomatology, i.e. Mobile Cognitive Therapy (M-CT) versus treatment as us usual (TAU). Remitted patients (n = 268) with at least two previous depressive episodes will be recruited and randomized over (1) M-CT in addition to TAU versus (2) TAU alone, with follow-ups at 3, 12, and 24 months. Randomization will be stratified for number of previous episodes and type of treatment as usual. Primary outcome is time until relapse/recurrence over 24 months using DSM-IV-TR criteria as assessed by the Structured Clinical Interview for DSM-IV Axis I Disorders (SCID). For the economic evaluation the balance between costs and health outcomes will be compared across strategies using a societal perspective. Discussion: Internet-based interventions might be helpful in empowering patients to become their own disease managers in this lifelong recurrent disorder. This is, as far as we are aware of, the first study that examines the (cost) effectiveness of an E-mental health program using SMS monitoring of symptoms with therapist support to prevent relapse in remitted recurrently depressed patient

Disrupting the rhythm of depression: design and protocol of a randomized controlled trial on preventing relapse using brief cognitive therapy with or without antidepressants

Background: Maintenance treatment with antidepressants is the leading strategy to prevent relapse and recurrence in patients with recurrent major depressive disorder (MDD) who have responded to acute treatment with antidepressants (AD). However, in clinical practice most patients (up to 70-80%) are not willing to take this medication after remission or take too low dosages. Moreover, as patients need to take medication for several years, it may not be the most cost-effective strategy. The best established effective and available alternative is brief cognitive therapy (CT). However, it is unclear whether brief CT while tapering antidepressants (AD) is an effective alternative for long term use of AD in recurrent depression. In addition, it is unclear whether the combination of AD to brief CT is beneficial.Methods/design: Therefore, we will compare the effectiveness and cost-effectiveness of brief CT while tapering AD to maintenance AD and the combination of CT with maintenance AD. In addition, we examine whether the prophylactic effect of CT was due to CT tackling illness related risk factors for recurrence such as residual symptoms or to its efficacy to modify presumed vulnerability factors of recurrence (e.g. rigid explicit and/or implicit dysfunctional attitudes). This is a multicenter RCT comparing the above treatment scenarios. Remitted patients on AD with at least two previous depressive episodes in the past five years (n = 276) will be recruited. The primary outcome is time related proportion of depression relapse/recurrence during minimal 15 months using DSM-IV-R criteria as assessed by the Structural Clinical Interview for Depression. Secondary outcome: economic evaluation (using a societal perspective) and number, duration and severity of relapses/recurrences.Discussion: This will be the first trial to investigate whether CT is effective in preventing relapse to depression in recurrent depression while tapering antidepressant treatment compared to antidepressant treatment alone and the combination of both. In addition, we explore explicit and implicit mediators of CT.Trial registration: Netherlands Trial Register (NTR): NTR1907

NORADRENERGIC AND ADRENERGIC FUNCTIONING IN AUTISM

A neurochemical assessment of noradrenergic and adrenergic functioning was carried out with autistic patients and normal control individuals. Norepinephrine and related compounds were measured in autistic (n = 17 unmedicated, 23 medicated; age range 9-29 years old) and normal controls (n = 27; age range 9-36 years old). Plasma levels and urinary excretion of 3-methoxy-4-hydroxy-phenylglycol (MHPG) were measured, as were urinary excretion rates of norepinephrine (NE), epinephrine (EPI), and vanillylmandelic acid (VMA). No significant group mean differences were seen between the autistic and control groups. In both the autistic and control groups urinary excretion rates of norepinephrine and epinephrine were substantially higher in the afternoon-evening (5-11 PM) compared to the overnight (11 PM-7 AM) collection period. Based on our neurochemical assessment, marked abnormalities in basal noradrenergic functioning do nor appear to be present in autism

PSYCHOSOCIAL EFFECTS OF 2 YEARS OF HUMAN GROWTH-HORMONE TREATMENT IN TURNER SYNDROME

Thirty-eight girls with Turner syndrome were treated for 2 years with human growth hormone. Both parents and patients carried out assessments of the effects of treatment on various aspects of psychosocial functioning. The children used the Piers-Harris Self-Concept Scale and the Social Anxiety Scale for children, while parents were interviewed and filled in the Child Behavior Checklist. Both parents and children used the Therapy Evaluation Scale and the Silhouette Apperception Technique. Teachers completed the Teacher Rating Form. Results showed no significant changes with treatment in self-concept or social anxiety, or in behavioural problems, though immature behaviour was less common after the treatment period. Therapy was evaluated positively, and improvements were apparent in both social and emotional functioning; about a quarter of the patients became more independent, happier and more involved in social interactions. Unrealistic perceptions of present height and expectations of future height were expressed by a large proportion of both children and parents

Monocyte-derived dendritic cells in bipolar disorder

Background: Dendritic cells (DC) are key regulators of the immune system, which is compromised in patients with bipolar disorder. We sought to study monocyte-derived DC in bipolar disorder. Methods: Monocytes purified from blood collected from DSM-IV bipolar disorder outpatients (n = 53, 12 without lithium treatment) and healthy, individuals (n = 34) were differentiated into DC via standard granulocyte-macrophage colony-stimulating factor/ interleukin-4 culture (with/without 1, 5, and 10 mmol/L lithium chloride). The DC were analyzed for DC-specific and functional markers and for T-cell stimulatory potency. Results: Monocytes of bipolar patients showed a mild hampering in their differentiation, into fully, active DC, showing a weak residual expression of the monocyte marker CD14 and a relatively low potency, to stimulate autologous T cells. Lithium treatment abolished this mild defect. and monocyte-derived DC of treated bipolar patients showed signs of activation (i.e., an up-regulated potency to stimulate autologous T cells and a higher expression of the DC-specific marker CD1a). This activated phenotype contrasted with the suppressed phenotype of monocyte-derived DC exposed to lithium in vitro (10 mmol/L) during culture. Conclusions: Dendritic cells show mild aberrancies in bipolar disorder that are fully restored to even activation after in vivo lithium treatment

Typeringen van bodemecosystemen in Nederland met tien referenties voor biologische bodemkwaliteit

Het RIVM heeft samen met diverse kennisinstituten tien veel voorkomende bodems gekarakteriseerd waar de bodemkwaliteit op orde is, zogeheten referenties voor biologische bodemkwaliteit (RBB). Hier bestonden nog geen criteria voor. Deze referenties kunnen als streefbeeld gebruikt worden om bodemgebruik duurzamer te maken. De referenties zijn bepaald voor tien combinaties van bodemgebruik (onder andere melkveehouderij, akkerbouw en heide) en bodemtype (zand, veen, klei en loss). Dit is representatief voor driekwart van het bodemoppervlak van Nederland. Diverse onderzoekers, onder andere op het gebied van bodemecologie, microbiologie en agrarisch bodembeheer, hebben locaties geselecteerd die volgens hun maatstaven een relatief goede bodemkwaliteit hebben. Hiervoor maakten zij gebruik van de gegevens van het Landelijk Meetnet Bodemkwaliteit (LMB) over de toestand van de bodem. Op basis van deze informatie zijn de tien referenties bepaald. Het rapport bevat ook gemiddelde waarden van de biologische, chemische en fysische eigenschappen van de bodem, evenals een maat voor de spreiding van de gegevens. De mate waarin bodemorganismen voorkomen en hun diversiteit zijn ook beschreven.The RIVM (Dutch abbreviation for National Institute for Public Health and the Environment) and other institutes have described ten soil ecosystem profiles, or 'biological soil quality references', based on soil quality as inferred from existing empirical evidence. This is a pilot study, since no specific protocol has been established yet. The aim is to use these new references as benchmarks in the implementation of a more sustainable use of soils. References were derived from a combination of data on land use (e.g. dairy farms, arable fields and heathlands) and soil type (sand, peat, clay and Loess). Soils types covering about three-quarters of the surface of the Netherlands are studied in this report. Several participants, with expertise ranging from soil ecology and microbiology to rural management, selected sites where they believed data to be representative of good soil quality. To do this, they used soil monitoring data from the Netherlands Soil Monitoring Network (in Dutch: LMB). The ten references were derived from empirical data. This report provides also the averages and frequency distributions of soil biological, chemical and physical soil characteristics. The occurence of soil organisms has also been described, as well as their biodiversity.VROM-BW