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Biomedical subjects

R Koenig

Publications and source records attributed to R Koenig.

At least 127 records · Page 7Linked to original sources
PubMed1987

Neuroendocrine responses to cold stress in normal subjects and depressives.

In order to assess the effects of cold stress on neuroendocrine function in persons with affective disorders, 11 normal subjects and eight depressed patients were subjected to a well-defined thermal stress in a cold chamber at 10 degrees C. Metabolic rate, skin and rectal temperature, and TSH, T4, T3, growth hormone, prolactin, and cortisol were measured simultaneously for 45 minutes prior to cold exposure and for 60 minutes in the cold. All subjects experienced robust changes in skin temperature and metabolic rate during cold exposure, while maintaining core temperature throughout. There were no changes in any of the neuroendocrine parameters during exposure to cold stress in either the controls or the depressives, although depressives had somewhat higher T4 and lower T3, TSH, and GH throughout the study. These findings indicate that hormones of these neuroendocrine axes are unresponsive to acute, moderate cold stress in normal man and that depressives show no greater reactivity than normals.

Acclimatization↗
PubMed1986

Cryptophthalmos--syndactyly syndrome without cryptophthalmos.

Based on a personal observation and a review of the literature five cases with the so-called cryptophthalmos-syndactyly syndrome but without cryptophthalmos are presented. It appears that eye lesions are non-obligatory components of a pleomorphic condition which may be overlooked in the absence of the name-giving anomaly. The diagnosis of the cryptophthalmos-syndactyly syndrome must be considered in patients with a combination of acrofacial and urogenital malformations with or without cryptophthalmos.

Abnormalities, Multiple↗
PubMed1985

Partial monosomy 10p syndrome.

A newborn infant with monosomy 10p13 is reported. The clinical signs and symptoms of the present case are compared with those of previously described cases. Although there is no pathognomonic feature, a characteristic monosomy 10p syndrome is recognizable.

Abnormalities, Multiple↗
PubMed1983

Favorable prognosis for malignant melanomas associated with acquired melanocytic nevi.

In a clinicohistopathologic study of 557 patients with primary cutaneous malignant melanoma, there were fewer metastases and/or deaths from melanoma when histologic evidence of a coexisting acquired melanocytic nevus was found. A total of 130 patients with melanocytic nevus and 427 cases of melanoma without histologic evidence of a nevus (denovo) were studied. Clinical follow-up evaluation for evidence of metastases and/or death was obtained. Only ten of the patients (7.7%) with nevus-associated melanoma had metastases and/or death v 78 (18.3%) with de novo melanoma. When stratified by lesion thickness, the logrank test for survival revealed a statistically significant difference between the two groups. An overall favorable outcome seen in patients with malignant melanomas associated with acquired melanocytic nevi was found, therefore, to be independent of lesion thickness as well as six other variables reported to be related to the biologic behavior of malignant melanoma. Thus, the presence of nevus cells in a specimen of malignant melanoma portends a better prognosis and may have important implications in the biology of this neoplasm.

Female↗
PubMed1982

Variants of ELISA in plant virus diagnosis.

Variations of enzyme-linked immunosorbent assay (ELISA) were compared with respect to their ability to detect and to differentiate serologically related plant viruses. The broadest range of serologically related viruses was detected by an indirect ELISA on unprecoated plates. Coating the plates with F(ab')2 fragments led to narrowing of the specificity in heterologous reactions of tymo-, tombus- and tobamoviruses in indirect ELISA. With Andean potato latent virus (APLV) heterologous reactions were weaker on plates precoated with F(ab')2 fragments than on those precoated with intact antibodies. Even on plates precoated with F(ab')2 fragments the indirect ELISA detected a broader range of serologically related viruses than the direct double antibody sandwich method. Heterologous reactions in indirect ELISA procedures on plates precoated with either intact antibodies or F(ab')2 fragments were always weaker than homologous reactions independent of the concentration of coating reactants and detecting antibodies. Attempts to differentiate closely related strains of APLV or radish mosaic virus by direct ELISA using F(ab')2 fragments either for coating the plates or after labelling with alkaline phosphatase for detecting the trapped antigens failed. Under suitable conditions, the additional working step usually necessary for indirect ELISA could be avoided by using a short procedure which at low concentrations of detecting antibodies was more sensitive than the conventional procedure.

Enzyme-Linked Immunosorbent Assay↗
PubMed1981

Acute metabolic response to cold exposure in unipolar and bipolar II patients.

The thermoregulatory response to cold exposure was examined in 11 unipolar and 5 bipolar II drug-free outpatients and 12 healthy controls. Subjects were studied in an environmental chamber at 10 C for 60 min. The heat production response was derived from the rate of oxygen consumption measured at 15-min intervals. Rectal and mean skin temperatures were continuously recorded from thermistor probes. Responses of the controls were used to establish a standard range against which the responses of the patients were compared. Six unipolar patients (54.5%) fell outside the standard range (chi 2 = 8.86, df = 1, p less than 0.005). Four of these patients showed a paradoxical decrease in heat production. Responses of the bipolar II patients fell within a narrow segment of the standard range, such that 10 of 12 controls (83.3%) responded outside the segment (chi 2 = 10.12, df = 1, p less than 0.005). These findings indicate that unipolar patients show greater variability and bipolar II patients less variability than controls in thermoregulatory response to cold. These observations extend previous suggestions of hypothalamic-limbic system dysfunction in patients with depression.

Adult↗