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Biomedical subjects

H Lehmann

Publications and source records attributed to H Lehmann.

At least 235 records · Page 13Linked to original sources
PubMed1976

[Animal studies on the tolerability of NAB 365 (clenbuterol) (author's transl)].

The findings of acute, subacute and chronic toxicity studies in rats and dogs with the new beta-mimetic agent 4-amino-alpha-[(tert.-butylamino)methyl]-3,5-dichlorobenzyl alcoholhydrochloride (NAB 365, clenbuterol) are reported. The longest period of investigation, with daily oral administration of the substance, was 18 months (rats) and 12 months (dogs). No abnormalities of any kind were found in the rat studies which could be attributed to the substance. The administration of clenbuterol to dogs produced microscopically small lesions in the myocardium which were not dose-dependent and which were localised entirely in the papillary muscle of the left ventricle. The reason for these lesions was that dogs react to the substance with severe tachycardia, as a consequence of a reduction in diastolic blood pressure produced even by very low oral doses. Oxygen deficiency occurs which affects particularly the papillary muscle. The response to hypoxia is better capillarisation. This causes an improvement in the oxygen supply, which in turn prevents the spread of existing necroses and the development of further lesions.

Administration, Oral↗
PubMed1976

[Reproduction-toxicologic tests with a new beta-mimetic agent clenbuterol (NAB 365) (AUTHOR'S TRANSL)].

The reproduction-toxicologic tests on rat and rabbit yielded no indication of a teratogenic potency of the beta-mimetic agent 4-amino-alpha-[(tert.-butylamino)methyl]-3,5-dichlorobenzyl alcohol-hydrochloride (clenbuterol, NAB 365). The fertility test showed no signs of reduced fertility. Excessive dosage of NAB 365 to pregnant rats led to an increased mortality of the pups during the neonatal period. A dosage of 1 mg/kg is regarded as the maximum tolerated dosage in perinatal toxicity tests.

Animals↗
PubMed1976

[Clinical trial of the antibacterial combination sulfamoxole/trimethoprim (CN 3123)/Fourth communication: Clinical results with CN 3123 in infections of the gastrointestinal tract, the skin and gynecological adnexes (author's transl)].

The antibacterial activity of N1-(4,5-dimethyl-2-oxazolyl)-sulfanilamide (sulfamoxole) and 2,4-diamino-5-(3,4,5-trimethoxy-benzyl)-pyrimidine (trimethoprim) (CN 3123, Nevin, Supristol) was studied in various bacterial infections in the fields of internal medicine, dermatology and gynecology. It was found that: 1. CN 3123 exhibits antibacterial activity in bacterial infections of the intestinal tract, particularly in salmonellosis and shigellosis. 2. CN 3123 is effective against bacterial infections of the female genital organs. 3. CN 3123 is very effective in patients with bacterial infections of the skin. 4. The antibacterial activity of CN 3123 in these indications is comparable to its action on bacterial infections of the urinary organs and respiratory tract and in ENT infections.

Adolescent↗
PubMed1976

[Teratologic studies in rabbits and rats with the morphine derivative codeine (author's transl)].

Codeine was administered to rabbits and rats during the organogenetic phase (days 6--18 and 6--15, resp.) in oral doses of 5, 12.5 and 30 mg/kg and 10, 35 and 120 mg/kg, resp. The tests in rabbits yielded no indication of a teratogenic or embryolethal action of the substance under investigation. Even in the experiments on rats no teratogenicity could be realised. The highest dose of 120 mg/kg led to an increased mortality of rat embryos around the time of implantation. As this dose was toxic even to adult rats the described experiments give no indication of an increased risk during pregnancy.

Animals↗
PubMed1975

The oxygen affinity of haemoglobin Tak, a variant with an elongated beta chain.

The oxygen affinity was investigated of purified Hb Tak, a human haemoglobin variant with elongated beta-chains. A very low P50 value was found which was not influenced by the addition of 2,3 diphosphoglycerate. The n value was 1, indicating non-cooperativity. The oxygen equilibrium curve of the whole blood haemolysate containing Hbs A and Tak was close to that of Hb A at the top of the curve, while the bottom of the curve greatly deviated from the latter, indicative of small if any interaction between Hb A and Tak during oxygenation.

Diphosphoglyceric Acids↗
PubMed1975

Haemoglobin Rahere (beta Lys-Thr): A new high affinity haemoglobin associated with decreased 2, 3-diphosphoglycerate binding and relative polycythaemia.

A new haemoglobin with increased oxygen affinity, beta82 (EF6) lysine leads to threonine (Hb Rahere), was found during the investigation of a patient who was found to have a raised haemoglobin concentration after a routine blood count. The substitution affects one of the 2, 3-diphosphoglycerate binding sites, resulting in an increased affinity for oxygen, but both the haem-haem interaction and the alkaline Bohr effect are normal in the haemolysate. This variant had the same mobility as haemoglobin A on electrophoresis at alkaline pH but was detected by measuring the whole blood oxygen affinity; it could be separated from haemoglobin A, however, by electrophoresis in agar at acid pH. The raised haemoglobin concentration was mainly due to a reduction in plasma volume (a relative polycythaemia) and was associated with a persistently raised white blood count. This case emphasises the need to measure the oxygen affinity of haemoglobin in all patients with absolute or relative polycythaemia when some obvious cause is not evident.

Adult↗
PubMed1975

The myoglobin of primates. VII. Perodicticus potto edwarsi (potto).

The primary structure of the myoglobin of the prosimian Lorisidae Perodictius potto edwarsi (potto) was studied. Tryptic, chymotryptic, peptic, subtilisin and thermolysin peptides were aligned against the sequence of human myoglobin. Sixteen differences were found which were confirmed by sequential analysis. On comparison of the West African potto with two other prosimian myoglobins known so far, there were 12 differences between the potto and the galago (East African) and 18 differences between the potto and the sportive lemur (Madagascar).

Amino Acid Sequence↗
PubMed1975

[A case of sarcoidosis with simultaneous primary hyperparathyroidism, coincedence or consequnce?].

We have reported of a case of generalised sarcoidosis with primary hyperparathyroidism. A pathogenetic relation between sarcoidosis associated with hypercalcemia and the development of parathyroid adenoma will be discussed and a causal connection will be proposed. According to our hypothesis every primary hyperparathyroidism could have developed from regulatory hyperfunction. This is illustrated by sarcoidosis with hypercalcemia and hypercalcuria. In this case a disturbance in vitamin D dependent calcium metabolism induces hyperplasia of the parathyroid which later leads to the development of a parathyroid adenoma. In addition a review of literature describing similar cases is given.

Adenoma↗