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Biomedical subjects

A Zeeck

Publications and source records attributed to A Zeeck.

At least 19 recordsLinked to original sources
PubMed2006

Bioactive hydroxyphenylpyrrole-dicarboxylic acids from a new marine Halomonas sp.: Production and structure elucidation.

The new marine Halomonas sp. strain GWS-BW-H8hM (DSM 17996) was found to produce 3-(4'-hydroxyphenyl)-4-phenylpyrrole-2,5-dicarboxylic acid (HPPD-1) and 3,4-bis(4'-hydroxy- phenyl)pyrrole-2,5-dicarboxylic acid (HPPD-2). In initial cultivations using marine broth, only low contents of these compounds have been isolated. Improving the conditions and growing the strain on artificial seawater supplemented with tryptone 10 g l(-1), yeast extract 5 g l(-1), L-tyrosine 0.6 g l(-1), glycine 1 g l(-1), and glucose 6 g l(-1), the growth-associated HPPD-1 and HPPD-2 production of a 40-l batch cultivation reached the amounts of 47 mg l(-1) and 116 mg l(-1), respectively, after 65 h. Both compounds showed potent anti-tumor-promoting activities.

Anticarcinogenic Agents↗
PubMed2006

[Bulimia nervosa].

Bulimia nervosa is characterized by episodes of binge eating and compensatory behaviours (self-induced vomiting, laxative misuse, dietary restriction). It has a complex aetiology and is mostly found in young women. Bulimia leads to substantial physical and psychosocial morbidity. Bulimia nervosa needs specialized psychotherapeutic treatment. In most cases outpatient treatment is sufficient, but comorbidity with other psychiatric disturbances has to be taken into account. Additional psychopharmacological interventions might be helpful. After 5 to 10 years about 50% of the patients show complete remissions, 30% partial remissions and about 20% a chronic course of the illness. General practitioners, dentists and gynaecologists should be informed about typical signs of the disorder that is often hidden by the patients.

Bulimia↗
PubMed2005

Drop outs from in-patient treatment of anorexia nervosa.

OBJECTIVE: Aim of the study was to identify patient characteristics that distinguish drop outs and completers from in-patient treatment for anorexia nervosa. METHOD: A total of 133 consecutively admitted in-patients with anorexia nervosa (age range 16-50 years; 92.5% women) were analysed using sociodemographic variables as well as measures of psychopathology (SCL-90-R, EDI-2) and interpersonal difficulties (IIP-C). Patients were treated in a multimodal treatment setting, combining cognitive-behavioural and psychodynamic components. RESULTS: Patients, who reported fewer symptoms, were hospitalized before and had a comorbid depression stayed more often in psychotherapy. Patients dropping out of treatment (31.6%) showed a trend to higher levels of maturity fears. Subtype, age, duration of illness, comorbid personality disorders or previous drop outs were not predictive of dropping out. CONCLUSION: Addressing the high ambivalence and maturity fears of anorexic patients should be an essential issue in psychotherapy with this patient group.

Adolescent↗
PubMed2003

[Psychosomatic liaison service in neurology. Accordance between need for psychotherapeutic interventions and their realization].

The study addresses the realization of psychotherapeutic interventions in the framework of an integrated psychosomatic liaison service in neurology. Eighty-four patients from one unit at the Department of Neurology of the University of Freiburg, Germany, underwent structured psychodiagnostic interviews and filled in self-rating instruments to evaluate mental disorders, psychosocial distress, ways of coping, and quality of life. Motivation and the need for treatment were estimated by both patients and a liaison psychotherapist. Using ICD-10-F criteria, mental and behavioral disorders were diagnosed in 35% of the cases. Thirty-seven percent of the patients desired psychological support. Actual intervention occurred in 27%, with a mean consultation rate of 3.7 sessions. There was only slight agreement between the estimated need for treatment and the interventions actually performed. The realization of psychotherapeutic interventions was subject to a complex interaction between patient needs, "objective" psychosocial distress, and institutional factors. Differentiation between primary medical care and psychotherapy was difficult.

Adult↗
PubMed2003

Need and use of psychotherapeutic interventions within a psychosomatic liaison service in neurology.

OBJECTIVES: The study addresses the evaluation of psychosocial distress, the need for care as determined by a psychotherapist and patients, and the realization of psychotherapeutic interventions within a routine psychosomatic liaison service. MATERIAL AND METHODS: A total of 84 patients from one unit at the Department of Neurology of the University of Freiburg, Germany, underwent a structured psychodiagnostic interview and filled out self-rating instruments to evaluate mental disorders, psychosocial distress, ways of coping strategies and quality of life. The need for treatment and the motivation of patients were estimated by both patients and a liaison psychotherapist. RESULTS: Using ICD-10-F criteria, mental and behavioral disorders were diagnosed in 35% of cases. Professional assessment indicated a need for psychotherapeutic treatment in 37% of patients; actual intervention occurred in 27%. Only slight agreement was found between the estimated need for treatment and the interventions actually performed. CONCLUSIONS: The realization of psychotherapeutic interventions is subject to a complex interaction between the needs of a patient, the "objective" psychosocial distress of the patient, and institutional factors. About 10% of the hospitalized patients considered in the study need continuous psychotherapeutic treatment.

Adult↗
PubMed2001

Enterobactin: the characteristic catecholate siderophore of Enterobacteriaceae is produced by Streptomyces species.(1).

Enterobactin is described in the literature as the typical iron-chelating compound (siderophore) produced by bacteria of the family Enterobacteriaceae. In the course of a HPLC with diode array detection screening programme for detection of novel secondary metabolites, enterobactin, its biosynthetic precursor 2,3-dihydroxy-N-benzoylserine and its linear dimer and trimer condensation products were found to be produced by two Streptomyces strains besides the trihydroxamate-type siderophores desferri-ferrioxamine B and E.

Chromatography, High Pressure Liquid↗
PubMed2001

Semisynthetic derivatives of concanamycin A and C, as inhibitors of V- and P-type ATPases: structure-activity investigations and developments of photoaffinity probes.

V-type ATPases are inhibited by the plecomacrolides bafilomycin and concanamycin, which exert their inhibitory potential at nanomolar concentrations. In addition, some P-type ATPases are inhibited at micromolar concentrations. We initiated intensive structure-activity investigations with semisynthetic concanamycin derivatives to approach the following two questions: (i) What is the pharmacophor, the structural key element, of the plecomacrolides that leads to their inhibitory potential against V- and P-type ATPases? (ii) Where is the binding site within these two different types of ATPases? In a first step, we examined where chemical modifications (O-acylations, substitutions, eliminations) could be placed without seriously affecting the inhibitory potential of the macrolides. In a second step, we used the knowledge of these structure-activity investigations to introduce traceable elements (fluorescent or radioactive) or nitrene-generating azido or carbene-generating diazirine-groups able to bind the inhibitors to their target covalently. These studies led finally to the synthesis of two photoaffinity probes that were used in labeling experiments with the purified plasma membrane V-type ATPase of Manduca sexta (described in a following paper, Huss, M., Gassel, M., Ingenhorst, G., Dröse, S., Zeeck, A., Altendorf, K., Wieczorek, H., manuscript submitted).

Adenosine Triphosphatases↗
PubMed2001

Five naphthalene glycosides from the roots of Rumex patientia.

Three novel and two known naphthalene glycosides were isolated from the roots of Rumex patientia L. (Polygonaceae). The structures of the new compounds were established, respectively as 2-acetyl-3-methyl-6-carboxy-1,8-dihydroxynaphthalene-8-O-beta-D-glucopyranoside, 4,4"-binaphthalene-8,8"-O,O-di-beta-D-glucopyranoside and 2-acetyl-3-methyl-1,8-dihydroxynaphthalene-8-O-beta-D-glucopyranosyl (1-->3) beta-D-glucopyranoside on the basis of spectral analysis. The other napthalene glycosides were determined as nepodin-8-O-beta-D-glucopyranoside and torachrysone-8-O-beta-D-glucopyranoside by comparison of their spectral data with those previously reported.

Glycosides↗
PubMed2001

The structures of antioxidant and cytotoxic agents from natural source: anthraquinones and tannins from roots of Rumex patientia.

A new anthraquinone glycoside, emodin-6-O-beta-D-glucopyranoside, and a new simple halogenated flavan-3-ol, 6-chlorocatechin, have been isolated from the roots of Rumex patientia L. together with seven known phenolic compounds. Their structures were elucidated on the basis of spectroscopic methods. Cytotoxic effects and radical scavenging properties of the isolated compounds have been demonstrated.

Anthraquinones↗
PubMed2001

New co-metabolites of the streptazolin pathway.

Variation of the culture conditions of Streptomyces sp. strain A1, which produces streptazolin (1), resulted in the isolation of four new co-metabolites: 5-O-(beta-D-xylopyranosyl)streptazolin (3), 9-hydroxystreptazolin (4), 13-hydroxystreptazolin (5), and streptenol E (6). Their structures were established by spectroscopic and chemical methods. The possible biosynthetic relationship between the streptazolins and the streptenols is discussed.

Antibiotics, Antineoplastic↗
PubMed2001

Two new chlorinated naphthalene glycosides from Rumex patientia.

Two new naphthalene derivatives, named patientosides A (1) and B (2), were isolated from the roots of Rumex patientia. The structures of the new compounds were established as 2-acetyl-4-chloro-1,8-dihydroxy-3-methylnaphthalene-8-O-beta-D-glucopyranoside (1) and 2,4-dichloro-1,8-dihydroxy-3-methylnaphthalene-8-O-beta-D-glucopyranoside (2) by means of spectroscopic methods.

Chromatography, Thin Layer↗
PubMed2001

Simocyclinones: diversity of metabolites is dependent on fermentation conditions.

Simocyclinones, a novel group of angucyclinone antibiotics, are produced by Streptomyces antibioticus Tü 6040. The compounds show antibacterial and antitumor properties. In submerged cultivation, the production of simocyclinones is strongly dependent on the carbon and nitrogen sources used in a chemically defined medium. Productivity of distinct components and diversity of simocyclinone compounds are influenced by the medium composition. Four series of simocyclinone compounds were detected by high-performance liquid chromatography (HPLC) diode array detector (DAD) and HPLC electrospray ionization (ESI) mass spectrometry (MS) analysis, isolated and the structures determined by nuclear magnetic resonance (NMR) techniques. Under optimized conditions, simocyclinone D8 was produced in an amount of 300 mg l(-1) and simocyclinone C4 in a concentration up to 50 mg l(-1).

Chromatography, High Pressure Liquid↗
PubMed2001

Bagremycin A and B, novel antibiotics from streptomyces sp. Tü 4128.

Two novel secondary metabolites, bagremycin A (2) and B (3), were detected in the culture filtrate of Streptomyces sp. Tü 4128 by HPLC-diode-array screening. They are phenol esters of 3-amino-4-hydroxybenzoic acid with a derivative of p-coumaric acid and show a moderate activity against gram-positive bacteria and some fungi.

Aminobenzoates↗
PubMed2000

[Termination of inpatient treatment for anorexia nervosa].

BACKGROUND: Dropout is a neglected area of research; patients with anorexia nervosa are a group with high risk for dropout. RESEARCH QUESTIONS: 1. What are the frequency and type of dropout in disorder-specific, integrated treatment programs for anorexic patients? 2. What are the predictors for dropout? METHOD: Analysis of 80 prospectively documented, consecutive treatment episodes of anorexic inpatients, based on multimodal clinical and psychometric parameters. RESULTS: Twenty percent of patients terminated on their own initiative, often after reaching target weight; 10% were discharged by the treatment team. At least 43% of dropouts continued with some sort of psychotherapy within the 3 months after discharge. Previous dropout was a predictor for dropout in the present episodes. Patients with no comorbidity had a higher risk of dropout. Patients discharged by the team had personality disorders more often. Patients with comorbid depression stayed in treatment. CONCLUSIONS: The form of termination of treatment should be routinely assessed. Previous dropout and comorbidity are indicators of the risk of dropout.

Adolescent↗
PubMed2000

Sphaerolone and dihydrosphaerolone, two bisnaphthyl-pigments from the fungus Sphaeropsidales sp. F-24'707.

Two new bisnaphthalene compounds, sphaerolone (1) and dihydrosphaerolone (2), together with 2-hydroxyjuglone (9), were isolated from the culture broth of a Sphaeropsidales sp. (strain F-24'707) after inhibition of the regular proceeding 1,8-dihydroxynaphthalene (DHN) biosynthesis with tricyclazole. The structures of 1 and 2 were established by detailed spectroscopic analysis and present novel bisnaphthalenes. The biosynthetic origin of 1 and 2 as dimerization products of 1,3,8-trihydroxynaphthalene, an intermediate of the DHN biosynthesis, is discussed.

Benzofurans↗
PubMed2000

UV mutagenesis and enzyme inhibitors as tools to elucidate the late biosynthesis of the spirobisnaphthalenes.

The metabolite pattern of UV mutants of the spirobisnaphthalene producing fungus F-24'707 by TLC and HPLC analysis has been investigated. Mutants with differences in colony morphology or colour compared to the parent strain were isolated. Cultivation in shaking flasks and P flasks showed differences in the metabolite pattern of some of the strains. Furthermore, enzyme inhibitors were used to block the spirobisnaphthalene biosynthesis of the parent strain at different steps. Feeding of precursors and intermediates of cladospirone bisepoxide (15) led to a two-fold increase of the production of 15. From these data and preceding biosynthetic studies we deduced a general pathway for the biosynthesis of all spirobisnaphthalenes of the fungus F-24'707. This enables us to present the hypothesis that all bisnaphthalenes described so far are produced using a common pathway with only a few intermediates as central branching points.

Chromatography, High Pressure Liquid↗