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Biomedical subjects

W Heine

Publications and source records attributed to W Heine.

At least 55 records · Page 3Linked to original sources
PubMed1987

Mouse embryo growth in different culture media: selection of a medium for quality control cross-testing of human in vitro fertilization conditions.

A total of 2070 two-cell mouse embryos were recovered from 89 superovulated female hybrid mice. Six different culture media were tested. The various media supported mouse embryo development as follows (percentage mean +/- SD, n = 10): Hopp and Pitts medium (H&P) 87 +/- 5 Dulbecco's modified; Eagle's medium supplemented with 10% (volume/volume, v/v) fetal bovine serum (DMEM) 80 +/- 4; Ham's F-10 +/- 15.0% (v/v) human fetal cord serum (hFCS) 79 +/- 3; Whittingham's T-6 medium (WT-6) 60 +/- 4; Ham's F-10 +/- 7.5% (v/v) hFCS 55 +/- 5; Krebs-Ringer low bicarbonate buffer (KRLBB) 42 +/- 6. In H&P, DMEM, WT-6, and Ham's F-10 medium supplemented with hFCS, the pH was maintained within a narrow range of 7.30-7.45 and adequate level of oxygenation was achieved during 72 h in culture. KRLBB had poor buffering capacity and attained ineffective levels of oxygenation during culture. Superior mouse embryo development from two-cells to morulae and hollow blastocysts occurred in H&P, Ham's F-10 + 15% hFCS, and DMEM. Ham's F-10 medium supplemented with hFCS is routinely checked for its ability to support mouse two-cell embryo development to morulae and blastocysts. This is done in conjunction with H&P medium as the control.

Animals↗
PubMed1987

[Resorption and metabolic utilization of D-[alpha-15N]lysine and L-[alpha-15N]lysine after oral administration, with special reference to the metabolism of intestinal bacteria].

Absorption of D-[alpha-15N]lysine and L-[alpha-15N]lysine following an oral single pulse labelling at a dosage of 5 mg 15N'/kg body weight was compared in four subjects aged 4 to 14 months. The wastages of 15N' in the faeces ranged from 0.3 to 5% of the input implying comparably high absorption rates of both the lysine enantiomers. Only about 7.6% of the 15N from the alpha-amino groups were found in the urine after loading with L-[alpha-15N]lysine. In contrast, about 80.2% of the 15N' dose from D-[alpha-15N]lysine were eliminated renally. However, 18.5% of the 15N' dose on an average were retained after D-[alpha-15N]lysine administration. This is certainly due to a partial desamination of D-lysine. The faecal bacteria isolated from the faeces contained no or only small amounts of 15N' after D-[alpha-15N]lysine loading. Following L-[alpha-15N]lysine administration a measurable 15N enrichment of the faecal bacteria of up to 0.09 at % excess was achieved in almost all cases.

Administration, Oral↗
PubMed1987

Excretion of 15N and incorporation into plasma proteins after high-dosage pulse labelling with various tracer substances in infants.

The suitability of a biosynthetically produced [15N] yeast-protein-thermitasehydrolysate ([15N] YPTH), [15N] yeast protein and [15N] glycine for use as 15N-tracers was tested in three groups of four infants each. The [15N] YPTH was obtained by hydrolysing 15N-labelled yeast protein with thermitase, a proteinase from Thermoactinomyces vulgaris. Following oral single-pulse labelling in a dosage of 10 mg 15N/kg body weight the 15N-excretion in stools and urine as well as the 15N-abundance in plasma proteins and in the TCA-soluble plasma fraction were determined. The [15N] YPTH differs from [15N] glycine in terms of the complete distribution of 15N among all 20 amino acids. This could be demonstrated by a distinctly lower [15N]ammonia (0.5 per cent) and a higher [15N2] urea excretion (5.0 per cent) compared with [15N] glycine (1.2 and 3.4 per cent respectively). The faecal loss of 15N from the [15N] YPTH was 3.7 per cent of the tracer dose, while the corresponding value after administration of [15N] yeast protein was found to be 7.4 per cent on average. There were no differences between the tracer substances in terms of the measured 15N-abundance in the plasma proteins (mean: 0.07 atom per cent excess) and in the TCA-soluble fraction (mean: 0.21 atom per cent excess).

Blood Proteins↗
PubMed1987

[Protein metabolism and lipid balance in dietary treatment of acute enteritis in infants with a defined standardized oligopeptide diet].

The advantage of a standardized oligopeptide formula (Peptisorb päd) for dietary management of diarrhea was proved in 10 infants aged 1 to 10 months with body weights between 4000 and 8860 g. The nitrogen balance turned to normal already at day 3 to 4 of the treatment due to the rapid increase of food supply. Whole body protein parameters estimated by 15N yeast protein thermitase hydrolyzate as a tracer substance were already normalized at that time. Protein synthesis amounted to 5.0 +/- 1.5 g/kg/day, protein breakdown to 3.7 +/- 1.5 g/kg/day and net protein gain to 1.3 +/- 0.6 g/kg/day, resp. Reutilisation rate of endogenous nitrogen was found to be 83%. This correlates with the relatively high nitrogen supply of the oligopeptide diet in comparison to mother's milk feeding. Approximately 15% of the administered amount of total nitrogen were excreted in the feces in contrast to only 5.8% of the 15N tracer dose, indicating the higher losses of endogenous nitrogen due to enteritis. The absorption of the medium chain triglycerides from the diet was 97.5% at an average and thus extremely high.

Acute Disease↗
PubMed1987

[New knowledge of protein nitrogen resorption in the colon].

The absorption of protein nitrogen by the colon was assessed in 8 infants with colostomy by giving [15N] yeast protein in a dosage of 5-20 mg 15N/kg (92.4 atom-% 15N). The absorption of 15N ranged between 87.1 and 98.1% of the administered dose, and the retention in the protein pool ranged between 81.0 and 95.7%. The incorporation of 15N in the plasma proteins was demonstrated by 15N-excess values between 0.01 and 0.10 atom-%, the TCA soluble fraction contained 15N-excess values of 0.04 to 0.19 atom-%. The results suggest that the colon can assimilate proteins when insufficient absorption of protein nitrogen in the small intestine occurs. The breakdown of protein is thought to result from the action of the colonic flora.

Colon↗
PubMed1986

15N tracer investigations of the physiological availability of urea nitrogen in mother's milk.

The physiological availability of urea in mother's milk was investigated in tracer studies using [15N]2 urea and involving 22 infants. The incorporation of 15N into the body protein was established in 16 subjects by emission spectrophotometrical determination of the 15N excess in the serum protein. Between 2% and 3.6% of the serum protein is synthesized from the urea nitrogen in mother's milk. In further studies on the 15N balance in 6 infants, renal excretion of 15N after oral multiple and single impulse labelling with [15N]2 urea constituted 60% of the dose administered. Three-tenths-2.5% was excreted in the feces. The retention of 15N in the protein pool varied between 16.7 and 61.4%.

Blood Proteins↗
PubMed1986

Fine structure of spermatozoa retrieved from retrograde ejaculates.

The proportion of viable, motile spermatozoa retrieved from retrograde ejaculates has been consistently low. Electron microscopic studies of spermatozoa of retrograde ejaculates collected in Baker's buffer and washed in Ham's F10 medium supplemented with 2% human serum albumin revealed considerable ultrastructural lesions to the sperm head and the midpiece. Swelling and/or loss of plasma membrane was observed in most of the sperm. In others, the membrane continuity was disrupted, and tattered remnants of it remained attached to a grossly abnormal acrosome. The acrosomal cap in the majority of the spermatozoa was swollen and irregular in shape. Some of the spermatozoa lacked the acrosome, and the sperm heads of these were lined by the inner acrosomal membrane. Subcellular derangement in the midpiece of retrograde spermatozoa was characterized by mitochondrial swelling and lysis, indicating definite cytotoxic injury to the spermatozoa. These EM observations are consistent with the findings of high sperm wastage in semen from men with retrograde ejaculation.

Adult↗
PubMed1986

Quantitative ultramorphological evaluation of swim-up spermatozoa used in human in vitro fertilization and transcervical intrauterine insemination.

Ultramorphological changes that occur on the sperm head during in vitro incubation of human spermatozoa was investigated using transmission electron microscopy (TEM). Motile spermatozoa that swim-up were processed for TEM. Washed but unincubated sperm heads had all of the fine structural characteristics of normal spermatozoa: intact plasma membrane, acrosome, equatorial segment, postacrosomal sheath, subacrosomal space filled with fine granular material, dense nucleus containing conspicuous nuclear vacuoles of differing sizes and numbers, and faintly discernible nuclear membrane. The procedure of washing and centrifugation did not alter the structural integrity of spermatozoa. Any evidence of ultramorphological changes in the incubated spermatozoa appeared to be confined to the surface of the anterior two-thirds of the sperm head. These changes were characterized by detachment of plasma membrane, fusion of plasma and acrosomal membranes, vesiculation of membranes, and exposure of acrosomal contents. There was a significant (p less than 0.001) time-dependent increase in the proportion of spermatozoa with such changes. The anterior border of these denuded sperm heads were bound only by the acrosome that appeared as electron-dense granular material on the outer margin and attached on its inner border to the inner acrosomal membrane. Furthermore, in vitro incubation of washed spermatozoa did not lead to any time-dependent degenerative changes.

Acrosome↗
PubMed1986

[Results of Lambling gastric juice analysis in infants with spastic hypertrophic pyloric stenosis (SHPS)].

In 27 infants aged 20 to 65 days with clinically and roentgenologically proved hypertrophic pyloric stenosis gastric juice analyses were performed according to Lambling. Basic acid output and maximal acid output in these infants were significantly increased as compared to healthy infants of the same age group. The higher acid output in the hypertrophic pyloric stenosis group was due to higher volumes and a higher acidity of the gastric juices. Basic acid output and maximal acid output increased following pylorotomy. There is evidence, that hyperacidity in pylorus stenosis of infancy is primarily and not due to the pyloric constriction. There was a distinct correlation between the degree of metabolic alkalosis and diminished acid outputs. The findings support the thesis, that infantile hypertrophic stenosis is originated by an increased parietal cell mass. The increased acid secretion and the enhanced release of secretin and cholecystokinin are supposed to originate the hypertrophy of the pyloric muscle.

Female↗