[Antimalarial 6-aminoquinolines. VII. 2- and 4-Alkoxy derivatives of 6-(4-diethylamino-1-methylbutylamino)-5,8-dimethoxyquinoline (author's transl)].

19 derivatives, 10 a--t, of 6-(4-diethylamino-1-methylbutylamino)-5,8-dimethoxyquinoline (1a) with alkoxy-, hydroxy-, and methylmercapto substituents in 4- and/or 2-position were synthesized with the aim of studying the influence of these substituents on antimalarial activity and toxicity of 1a. The alkoxy derivatives of 1a are highly active against P. vinckei (mouse).

[Citrate values in the whole blood of patients with malignant tumors of various locations].

Based on reports on elevated concentrations of 2-oxoglutarate in the blood of human subjects with tumors of various locations, data are presented on the concentration of citrate and pyruvate in the whole blood of 41 patients with malignant tumors (mainly of the female breast and of the digestive tract), 30 patients with benign surgical diseases and 12 healthy subjects. Adopting a level of significance of 2P=0.10 differences of concentration were found between the following collectives: (1) The mean value of citrate for the patients in tumor stage T4 was decreased by 23%, compared with healthy persons, and by 19%, compared with patients with benign surgical diseases.

A test of the transmethylation hypothesis in acute schizophrenic patients.

Keeping biochemical determinations and clinical judgements independent, the authors investigated three aspects of the transmethylation hypothesis. They found that 26 acutely schizophrenic patients were no more likely to have bufotenine or N,N-dimethyltryptamine present in urine or elevated serum indolethylamine N-methyltransferase activity than 10 normal control subjects. The authors conclude that these are naturally occurring substances which are equally likely to be present in normal and schizophrenic subjects.

Functioning at the clinical-research interface: the clinical-research meeting.

The authors describe their experience in carrying out clinical and psychobiological research in a therapeutic milieu setting. The clinical-research meeting, composed of clinical-care staff with secondary research responsibilities, researchers, and acutely psychotic patients, proved to be a useful mechanism for identifying and resolving inevitable problems at the clinical-research interface and enhanced the effectiveness of research implementation and patient care. The authors discuss three specific areas where covert issues threatened to undermine the work of the unit-the abrogation of research responsibility, the abrogation of clinical responsibility, and intergroup competition and envy.

Cerebrospinal fluid amine metabolites in acute schizophrenia.

The metabolites of serotonin, dopamine, and norepinephrine, 5-hydroxyindoleacetic acid (5HIAA), homovanillic acid (HVA), and 3-methoxy-4-hydroxy-phenylethylene glycol (MHPG), respectively, were studied in cerebrospinal fluid of patients with acute schizophrenia. Base line levels of these metabolites were not significantly different from those in normal, neurological, and affectively ill controls. Accumulations of 5HIAA and HVA following probenecid administration, which provide a measure of serotonin and dopamine turnover, were also not significantly different in patients with acute schizophrenia and affective illness.

Assessment of causal prophylactic activity in Plasmodium berghei yoelii and its value for the development of new antimalarial drugs.

The causal prophylactic activity of several reference and experimental antimalarial compounds was assessed in sporozoite-induced infections of NMRI mice with Plasmodium berghei yoelii (strain 17X). The animals were inoculated with 10 000 sporozoites per mouse and treated once 2-4 hours later. The test system has proved to be very suitable in experiments involving more than 3 000 mice.