PubMed Health⌕ Search

Biomedical subjects

M Lucht

Publications and source records attributed to M Lucht.

15 recordsLinked to original sources
PubMed2005

Mental and physical distress is modulated by a polymorphism in the 5-HT transporter gene interacting with social stressors and chronic disease burden.

Previous studies have yielded conflicting results as to the putative role of the functional polymorphism of the promoter region of the serotonin transporter gene (SLC6A4) in the etiology of anxiety-related traits and depressive disorders. Recently, a significant gene-environment interaction was found between life stressors, the short allele of the SLC6A4 polymorphism and depression. The aim of the present study was to investigate if such a gene-environment interaction could be replicated within a different population with a different risk structure. A total of 1005 subjects from a general population sample (Study of Health in Pomerania) were genotyped. Mental and physical distress were assessed on 38 items of the modified complaint scale (BL-38). The interaction between the SLC6A4 genotype, social stressors and chronic diseases with regard to the BL-38 score was evaluated by ANOVA. There was no independent association of genotype with mental and physical distress. However, significant interactions between genotype, unemployment and chronic diseases (F = 6.6; df = 3, 671; P < 0.001) were found in females but not in males. The genotype explained 2% of the total variance of the BL-38 score and 9.1% of the explained variance. The results partly confirm previous findings of a significant gene-environment interaction of the short allele, indicating a higher mental vulnerability to social stressors and chronic diseases. The relevance of this finding is sustained by the fact that the sample characteristics and the risk structure were highly different from previous studies.

Adaptation, Physiological↗
PubMed2004

[Effect of temperament, effect of alcohol expectancies and peer group on amount of drinking and alcohol-related problems in adolescence].

OBJECTIVE: The purpose of this longitudinal study was to investigate the relationship between temperament (novelty seeking, harm avoidance and reward dependence), alcohol expectancies, membership in a deviant/substance-using peergroup and drinking behaviour of adolescents drawn from a general population. METHODS: 147 adolescents about 15 years of age were interviewed and completed several self-rating questionnaires. We gathered additional information by interviewing their parents. One year after the initial assessment the adolescents only were interviewed and given questionnaires again. RESULTS: Adolescents with alcohol problems at the time of the second interview reported less harm avoidance, less reward dependence, and were more likely to be a member of a deviant/substance-using peergroup a year before, compared to offspring without alcohol problems. Furthermore, they held more positive alcohol expectancies than adolescents without alcohol problems. Taking into account the quantity of alcohol consumed per occasion, all results were confirmed, but temperament did not predict the extend of alcohol consumed after one year. CONCLUSIONS: Alcohol expectancies and peer group deviance/substance-use are strongly associated to alcohol problems and the amount of alcohol consumed. Therefore, they should be the focus of prevention and intervention in this age group.

Adolescent↗
PubMed2003

X-ray interferometry with microelectronvolt resolution.

We demonstrate an interferometer for hard x rays with two back-reflecting sapphire crystal mirrors--a prototype x-ray Fabry-Pérot interferometer. A finesse of 15 and 0.76 mu eV broad Fabry-Pérot transmission resonances are measured by the time response of the interferometer. Interference patterns are observed directly in spectral dependences of reflectivity.

Journal Article↗
PubMed2003

Gender differences in unipolar depression: a general population survey of adults between age 18 to 64 of German nationality.

BACKGROUND: Several studies from different epidemiological backgrounds have shown that unipolar depression is more prevalent in females than in males. This study examines gender differences in depression in a sample of 4075 probands recruited representatively from the general population in the northern German epidemiological catchment area of Lübeck. METHODS: Probands were interviewed with M-CIDI by lay interviewers. RESULTS: Being married only seems to increase the female depression risk when having children, while higher education reduced female excess; both male and female risk for depression raised sharply in separated, divorced and widowed probands. Not being employed was associated with an increased risk in male depression whereas in females risk was nearly unchanged. The gender ratio increased with the minimum number of depressive symptoms. Female excess was not reduced by a higher degree of subjective impairment or melancholic features. Females also predominated in longer episode durations. Female excess in the total group emerged beginning from adolescence with a tendency for a male excess in the prepubescent ages. No birth cohort effect was observed. LIMITATIONS: The cross-sectional design of this study precluded causal analysis of reported associations and some retrospective assessments are error-prone because of recall bias. CONCLUSIONS: We support previous findings of variations in gender differences in depression, however observed social parameter influences underline the need for a more detailed analysis of subgroups and underlying psychological mechanisms.

Adolescent↗
PubMed2002

Anomalous isotopic effect on the lattice parameter of silicon.

The difference Delta(a)=a(30)-a(28) of the lattice parameter of 30Si and 28Si crystals is measured over a temperature range from 4.7 to 700 K. In disagreement with existing knowledge, the strongest isotopic effect is not detected at the lowest achieved temperature T=4.7 K. An anomalous behavior is observed: The relative difference |Delta(a)/a| attains its maximum value of 56.8(5) ppm at T=75(10) K. The anomalous behavior is attributed to the influence of phonon modes with negative Grüneisen parameters. At T=700 K the effect still amounts to 30% of the maximal value. The experimental data are consistent with an approach based on the density-functional perturbation theory.

Journal Article↗
PubMed2002

[Alcohol problems in adolescence with reference to high risk children of alcoholic parents. Results of a family study in Mecklenburg Vorpommern].

In earlier studies, children of alcoholics (COAs) reported more alcohol and drug problems and higher levels of maladaptive behaviour and psychiatric distress than non-COAs. However, increased exposure to drugs and alcohol among COAs does not fully explain this phenomenon. In our family-based study design, we were able to investigate specific risk factors for alcohol problems in adolescence. In a first step, we compared a variety of psychosocial risk factors in 90 adolescents (12-18 years of age) from families with at least one alcohol-abusing parent with those of 90 adolescents of parents without alcohol disorders. In a second step, we investigated the meaning of all included risk factors for alcohol problems of the adolescents. Our results give some support to the existence of a lower extent of emotional warmth and support by parents of children in the COA sample. Moreover, males of the COA group reported more parental rejection and higher values on measures of attention problems and anxiety/depression than controls, whereas there were no such differences between females of the COA group and their control counterparts. Additionally, logistic regression analysis revealed that only the membership in a substance-using peer group and higher age are important risk factors for alcohol problems during adolescence. Considering our results, it is of great importance (a) to identify families at risk at the earliest possible stage and (b) to develop intervention and prevention programs further for parents and children to increase social competence and protect children at risk from later alcohol abuse.

Adolescent↗
PubMed2002

The use of a symptom checklist (SCL-90-R) as an easy method to estimate the relapse risk after alcoholism detoxification.

We tested the use of some subscales of the psychiatric symptom checklist SCL-90-R in predicting relapse within a 1-year follow-up period after a combined detoxification- and abstinence-focused day patient psychotherapy program in 20 men and 13 women with alcohol dependence. Scores of the SCL-90-R subscales interpersonal sensitivity (p = 0.008), anxiety (p = 0.022), phobic anxiety (p = 0.019) and Global Severity Index (GSI; p = 0.040) on admission were higher in the subgroup with relapse within the first year after therapy. A decrease in depression (p = 0.004), anxiety (p = 0.006) and GSI (p = 0.006) scores during therapy was associated with a longer abstinence duration (shorter vs. longer than 24 weeks). Therefore we propose to further investigate the capacity of the SCL-90-R to identify subgroups at higher risk for relapse after detoxification and abstinence therapy in patients with alcohol dependence.

Alcoholism↗
PubMed2000

gamma-Ray wavelength standard for atomic scales.

The wavelength of the 57Fe Mössbauer radiation is measured with a relative uncertainty of 0.19 ppm by using almost exact Bragg backscattering from a reference silicon crystal. Its value is determined as lambda(M) = 0.860 254 74(16)x10(-10) m. The corresponding Mössbauer photon energy is E(M) = 14 412.497(3) eV. The wavelength of the 57Fe Mössbauer radiation is easily reproducible with an accuracy of at least 10(-11)lambda(M) and could be used as a length standard of atomic dimensions.

Journal Article↗
PubMed1998

ATP-inhibited K+ channels and membrane potential of identified leech neurons.

The effect of the ATP-inhibited K+ channel on the membrane potential of leech Retzius neurons was analyzed using electrolyte-filled single-barrelled microelectrodes. The membrane potential was independent of the external nutrient supply during a period of 11 h, probably because the internal energy reserves were sufficient. The K+ channel activator HOE 234 ((3S,4R)-3-hydroxy-2, 2-dimethyl-4-(2-oxo-1-pyrrolidinyl)-6-phenylsulfonylchromane hemihydrate, 500 microM) induced a membrane hyperpolarization. In the presence of HOE 234, action potentials occurred with a reduced after-hyperpolarization and were discharged in bursts, possibly because of an inhibition of Ca2+ channels. The blocker of ATP-inhibited K+ channels tolbutamide did not significantly alter the membrane potential. In the absence of tolbutamide, the metabolic inhibitors iodoacetate, azide and cyanide (10 mM) evoked membrane hyperpolarizations, but in the presence of 1 mM tolbutamide their hyperpolarizing actions were reduced or abolished while membrane depolarizations were intensified. We conclude that ATP-inhibited K+ channels in the soma membrane of leech Retzius neurons provide coupling of cellular metabolism to electrical activity and ionic fluxes.

ATP-Binding Cassette Transporters↗
PubMed1996

Bright light therapy stabilizes the antidepressant effect of partial sleep deprivation.

Partial sleep deprivation (PSD) results in a pronounced decrease of depressive symptoms in the majority of patients with major depressive disorder. Generally this acute antidepressant effect is not stable, relapse usually occurs after one night of recovery sleep. We therefore studied whether light therapy, beginning in the morning after PSD, is able to prevent the relapse after sleep deprivation, using a controlled, balanced, parallel design. All patients received an antidepressant medication, which was kept constant before and during the study period. Fourteen of 20 patients (70%) showed a reduction of at least 40% in the Hamilton Depression Rating Scale (HDRS) in the morning after PSD and were classified as PSD responders. Responders as well as nonresponders were randomly assigned to receive either bright light (BL/3000 lux) or dim light (DL/100 lux) therapy during the following 6 days after PSD. In the responder group BL therapy prevented significantly (p = 0.005) the relapse after the next night of sleep and prolonged significantly (p = 0.011) the antidepressant effects of PSD up to 7 days. In contrast, patients in the DL condition relapsed after the recovery night and showed no further improvement of the depressive syndrome after 1 week of DL therapy. PSD nonresponders did not benefit from light treatment. These findings indicate that BL therapy might be efficacious to prevent relapse after PSD.

Adult↗
PubMed1985

[Proprioceptive sensitivity and orofacial functions].

Proprioceptive sensibility from stimulation of muscle, ligament articular and vestibular receptors plays a determining role in the regulation of tone, of the resting position of the mandible, of head posture and of the closure pathway of the mandible. Studies conducted on temporomandibular joints of fetuses and adult subjects failed to demonstrate the specialized corpuscles (a fact previously noted by Ramfjord) in the temporomaxillary joint capsule, described typically in other joints. In contrast, however, histology showed a particularly rich population of muscle receptors adjacent to this joint, this being only one of several particular characteristics.

Adult↗
PubMedDate not supplied

[The influence of psychosocial factors on mental well-being and physical complaints before and after undergoing an in-patient abortion].

In this study, 57 women were examined in terms of the influence of different psychosocial factors on their subsequent mental well-being and physical complaints one day before, one day after, and 3 months after undergoing an in-patient abortion. Furthermore a control group of 40 in-patients (women with pregnancy related problems) were included in the study. The results show that prior to the abortion, most women reported a multitude of psychological and physical problems. However, it was also shown that for the majority of the women interviewed, mental well-being and physical complaints improved significantly one day and 3 months after the abortion. While feelings such as relief predominated immediately postoperatively, after 3 months, participants reported feeling cheerful and interested in activities. Further, it was demonstrated that women whose general mood was more pronouncedly anxious-depressive one day prior to operation later (after 3 months) reported many complaints and worse well-being. It appears that these women were not able to experience the abortion as a problem solutions. Finally, the great importance of the quality of their relationship and cohesion was demonstrated in the decision to abort, while pregnancy counselling was found to have no effect.

Abortion, Induced↗
PubMedDate not supplied

Alcohol withdrawal treatment in intoxicated vs non-intoxicated patients: a controlled open-label study with tiapride/carbamazepine, clomethiazole and diazepam.

AIMS AND METHODS: Alcohol withdrawal treatment efficacy of tiapride/carbamazepine (A) vs clomethiazole (B) vs diazepam (C) in non-intoxicated patients and vs tiapride/carbamazepine in intoxicated patients (D; breath alcohol concentration > or = 1 g/l) was tested (n = 127) in a controlled randomized open-label study. RESULTS: Efficacy and safety were not different between groups (total group: delirium, 3.9%; seizure, 0.8%), except for a lack of efficacy in 18% of intoxicated tiapride/carbamazepine patients. A change of medication in this group was necessary only when primarily intoxicated patients had reached the non-intoxicated range. CONCLUSIONS: Treatment with tiapride/carbamazepine in alcohol-intoxicated patients proved to be safe.

Adult↗
PubMedDate not supplied

Influence of punishment, emotional rejection, child abuse, and broken home on aggression in adolescence: an examination of aggressive adolescents in Germany.

The results of this study provide evidence for the importance of psychosocial risks in childhood for aggressive behavior in adolescence. This study demonstrated that aggressive adolescents differed from a nonaggressive control group in an increased exposure to prior psychotraumatic events, such as sexual abuse (tendency), physical abuse, and broken homes. However, in predicting later aggressive behavior, long-term and chronically effective negative living conditions seem of greater importance. Parenting behavior which includes harsh punishment and emotional rejection as well as separation of the parents early in life are particularly important factors. Whereas aggressive girls do not differ from the nonaggressive control group in terms of self-reported mental health, the aggressive boys reported more attention deficits, depression, anxiety, delinquency, and social problems.

Adolescent↗