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Biomedical subjects

K Franke

Publications and source records attributed to K Franke.

At least 37 records · Page 2Linked to original sources
PubMed2000

Mobilization and retardation of uranium DOC species at three mine piles in Schlema/Alberoda, Saxony, Germany.

The modeling of geo-chemical processes needs the detailed and comprehensive knowledge of all chemical interactions existing in the flow path of waste dumps, subsoil and aquifer. This includes the adsorption, displacement and transport of heavy metal species of fulvic and humic acids, which represent the main amount of DOC in the liquid/solid system of the flow path. Comparative measurements of DOC concentrations in the input and output flow at the three waste dumps in the district Schlema/Alberoda indicated that DOC is produced and/or supplied within the waste dumps. The speciation of heavy metal compounds of fulvic and humic acids was achieved by means of sequential chromatographic analysis SCA and isoelectric focusing IEF. Between 5% and 20% of uranium exist in the flow path in the form of stable fulvic and humic acid species. Their distribution coefficients are strongly correlated with the pH values of the geo-chemical system.

Benzopyrans↗
PubMed2000

[Acupuncture massage vs Swedish massage and individual exercise vs group exercise in low back pain sufferers--a randomized controlled clinical trial in a 2 x 2 factorial design].

OBJECTIVE: Rehabilitation programs for low back pain (LBP) almost always contain massage and exercise therapy in one form or another. AIM: This study aimed to quantify the effectiveness of therapeutic 'Acupuncture' massage (APM; i.e. tonic stimulation of entire meridians) according to Penzel versus Swedish massage (SM) and individual medical exercises (IE) versus group exercises (GE) in LBP sufferers. PATIENTS AND METHODS: 109 patients participating in a complex in-patient rehabilitation program were randomised to four groups in a 2 x 2 factorial design. Main outcome measures were functional ability/disability (Functional Questionnaire Hanover, FFbH) and pain intensity (10 cm visual analogue scale, VAS). Pre/post changes were evaluated by means of 2-way analysis of variance (ANOVA). Additionally, lumbar motility was measured by a 2-inclinometer technique. RESULTS: Baseline mean FFbH score was 66 (SD = 18)%, mean pain intensity on VAS was 4.5 (SD = 2.4) cm. Lumbar flexion and extension were 49 (13) and 13 (7). Because of some differences between groups at baseline, group-standardized outcomes were used for analysis. APM showed beneficial effects for both disability and pain compared with SM (group differences: delta FFbH 7.0% [95% confidence interval (CI) 2.5-11.6], p = 0.003; delta VAS 0.8 cm [95% CI: 2-15], p = 0.024). Standardized response means were SRMFFbH = 0.5 and SRMVAS = 0.8 for APM, as opposed to SRMFFbH = -0.01 and SRMVAS = 0.4 for SM. Neither significant group differences between both exercise groups [delta FFbH -0.5% (95% CI -5.2 to 4.2); delta Vas 0.4 cm (95% CI 0.3 to 1.1)] nor significant interactions between medical exercise and massage were found. CONCLUSIONS: Given the fact that even the treatments considered to be the best available achieve at best moderate effects, the observed effect sizes with APM are promising and warrant further investigation in replication studies. In contrast to common view, no superiority of individual versus group exercises could be found in the present study.

Acupuncture Therapy↗
PubMed1999

Expression of cathepsin K in the human embryo and fetus.

Cathepsin K is a protease with high collagenolytic and elastinolytic activity. Its cellular expression was previously thought to be restricted to osteoclasts and osteoclast-mediated bone resorption. In this study, the expression of cathepsin K in the human embryo and fetus was demonstrated by immunohistochemistry, in situ hybridization, and by Northern blotting of fetal tissue extracts. Besides osteoclasts and chondroclasts and their precursors, epithelial cells of various organ systems expressed significant amounts of this enzyme. Respiratory and gastrointestinal mucosa, including bile duct epithelia and urothelia, showed high levels of cathepsin K expression. With the exception of the urothelium, showing a more homogenous expression pattern, the protease was usually accentuated in the surface cell layers of pithelia. In summary, these findings in the human embryo and early fetus demonstrated a significant expression of cathepsin K in different epithelial cell types besides osteoclasts. The functional aspects of cathepsin K expression in nonosteoclastic cells and potential conclusions on physiological and pathological conditions in the embryo-fetal or adult organism remain to be investigated. Dev Dyn 1999;216:89-95.

Blotting, Northern↗
PubMed1998

Expression of murine H1 histone genes during postnatal development.

Murine genes encoding the seven H1 histone isoforms H1.1-H1.5, H1(o) and H1t have been isolated and sequenced. We have established expression patterns of these genes in several tissues during postnatal development. For that analysis, RNase protection assay rather than Northern blot hybridization was used, since the sequences of these genes are highly similar and would cross-hybridize under Northern blot conditions. Expression patterns of H1.1 to H1.5 and H1(o) were determined in tissues of animals at days 5, 9 and 20 after birth and of adult mice. In addition, RNA was analyzed in three mouse cell lines (NIH3T3, P19, TM4). Transcription of the subtype genes H1.2 and H1.4 was found in all tissues and cell lines studied. The most varied expression patterns were obtained with the H1.1 subtype. H1.1 mRNA was found at high concentrations in thymus and spleen throughout development and in testis beginning with a low expression in 5-day-old animals and increasing levels in testis RNA from 9- and 20-day-old and adult mice. H1(o) mRNA was found primarily in highly differentiated tissues with concentrations decreasing from 5-day-old to adult animals.

3T3 Cells↗
PubMed1998

Testicular expression of the mouse histone H1.1 gene.

The replication-dependent H1 histone subtype H1.1 is the predominant H1 histone subtype in germ cell chromatin during early spermatogenesis. H1.1 gene transcription was assigned by in situ hybridization with H1.1-specific RNA probes to the basal layer of germ cells within the seminiferous tubule, but not to the somatic cells of the testis. In situ hybridization and immunohistochemistry with testis from 5-, 9-, and 20-day-old mice showed that H1.1 mRNA and protein was already present in spermatogonia of the prepuberal testis. In testis from 20-day-old and adult mice, the H1.1 mRNA remained confined to the most peripheral layer of germ cells. In contrast to the H1.1 mRNA, the H1.1 protein persisted in the germ cell chromatin with decreasing concentration throughout meiosis and in postmeiotic cells. These data demonstrate that in situ hybridization with H1.1 mRNA-specific probes can serve to identify germ cells with ongoing DNA replication. Comparison of results obtained from in situ hybridization and immunocytochemistry indicates that the period of H1.1 gene transcription is restricted to the proliferative phase in which cells undergo successive divisions, whereas the H1.1 protein is a component of the proliferative, meiotic, and spermiogenic phases.

Animals↗
PubMed1997

Histone gene expression and chromatin structure during spermatogenesis.

The chromatin of male germ cells is restructured throughout spermatogenesis. Analysis of differential histone protein patterns at specific stages of spermatogenesis may contribute towards an understanding of the changes in chromatin structure and function during this differentiation process. The most striking changes in histone patterns occur at the stage of pachytene spermatocytes when most of the linker H1 histones are replaced by the testis specific subtype H1t. In addition, replacement of core histone subtypes is observed at this stage. These structural changes precede the reorganization of chromatin at haploid stages when histones are replaced first by transition proteins and then by protamines.

Animals↗
PubMed1997

Histones: genetic diversity and tissue-specific gene expression.

Histones are the major protein constituents of the chromatin of eukaryotic cell nuclei. This group of basic proteins is extremely conserved throughout evolution and includes five classes termed H1, H2A, H2B, H3 and H4. In mammals, each of these classes except H4 is subdivided into several subtypes. The most divergent class of histones is the H1 protein family, which consists of seven different subtypes, termed H1.1-H1.5, H1 degree, and H1t. The subtypes H1.2 and H1.4 are found in most somatic cell nuclei, whereas H1 degree is found in several differentiated tissues, and H1t is restricted to mammalian testicular cells. Similarly, core histone subtypes replacing the major forms of H2A, H2B or H3 have been described. Biochemical analysis of protein and RNA from different tissues and cell lines demonstrates varied patterns of expression of individual histone subtype genes. Moreover, antibodies against specific histone subtypes and in situ hybridization with subtype-specific probes indicate that the expression of histone subtype genes is in several cases modulated in a tissue-specific manner. This is particularly evident at the different stages of spermatogenesis when chromatin undergoes substantial reorganization, which finally results in the highly condensed state of chromatin of the mature sperm head.

Animals↗
PubMed1997

[Iodine and thyroid hormone status of mother pigs and their offspring].

The iodine concentration in the chain sow feed-->blood serum of dams-->milk-->blood serum of piglets (2 per litter) was determined in 36 litters in two experiments with different dietary iodine levels and in 16 litters in the framework of field studies in two piglet production farms in each case at weaning after four weeks lactation. In the blood serum also the concentration of thyroxine (T4) and triiodothyronine was determined. The serum concentration of iodine and T4 did not indicate dietary iodine administration (sows) or showed only a weak response (piglets). The iodine concentration of milk was very strongly affected by iodine administration and by the iodine status of sows prior to the experiments. The highest milk iodine concentration was found in the sows of piglet production farms, corresponding to the level of iodine administered. For diagnosis of the iodine supply status the iodine concentration of sow milk should be analyzed. The lower limit of milk iodine concentration is presently defined as 50 micrograms/l, and the mean of 5 random samples per sow herd should not fall below this limit. Serum concentrations of iodine and T4 may remain moderate even in case of a low iodine supply (sow serum: 30 micrograms iodine/l, 25 nmol T4/l; piglet's serum: 50 micrograms iodine/l, 55 nmol T4/l), and are unsuited for diagnosis of iodine status.

Animals↗
PubMed1996

Acute health effects of exposure to high levels of air pollution in eastern Europe.

Acute effects of winter-type air pollution characterized by high levels of SO2, moderate levels of particles, and low acidity were studied. A panel of 155 asthmatic children and 102 adults with a history of asthma from the former German Democratic Republic cities of Erfurt and Welmar and from the Czech Republic city of Sokolov participated from September 1990 through June 1992. The panelists recorded daily symptoms, medication intake, and peak expiratory flow (PEF). Statistical analysis was based on linear regression of population-averaged time series controlling for trend, meteorology, and autocorrelation. A temporospatial time series approach was also applied to the data to eliminate possible confounding by some known or unknown variables that occurred simultaneously in two of the study areas. Weak same-day effects and a stronger cumulative effect of air pollution on children was observed both for PEF and for symptoms. PEF decreased -0.90% (-1.35 to -0.46%), and a symptom score increased 14.7% (0.8-28.6%) in association with an average increase of 128 micrograms/m3 SO2 over the previous 5 days. Effects on adults were smaller and less consistent. Morbidity of children was best predicted by SO2 and sulfate concentrations. The authors conclude that prolonged, high exposure to winter-type pollution was associated with small adverse health effects in asthmatics.

Adolescent↗
PubMed1995

Isolation of two murine H1 histone genes and chromosomal mapping of the H1 gene complement.

The mammalian H1 histone gene complement consists of at least seven H1 protein isoforms. These include five S-phase-dependent H1 protein subtypes and two more distantly related proteins, which are expressed upon terminal differentiation (H1o) or during the pachytene stage of spermatogenesis (H1t). In the past, three replication-dependent murine H1 genes plus the H1o and H1t genes have been isolated and characterized. In this report, we describe the sequences of two more H1 genes, and we show that all five murine replication-dependent H1 genes and the H1t gene map to the region A2-3 on Chromosome (Chr) 13. This is in agreement with our previous finding that the human H1 histone gene complement maps to 6p21.3, which corresponds to the A2-3 region on the murine Chr 13. Previous reports have shown that the replication-independent H1o genes map to syntenic regions on Chrs 22 (human H1o) and 15 (murine H1o).

Amino Acid Sequence↗
PubMed1994

[Significance of anamnesis and clinical findings for diagnosis of acute appendicitis. Acute Abdominal Pain Study Group].

UNLABELLED: Acute appendicitis raises considerable diagnostic difficulties. This is proven by rates of negative appendectomies that sometimes extent 30%. In order to find reasons for this we tested 211 patients findings for diagnostic relevance. METHOD: Within the European Community--Acute Abdominal Pain Survey, a study to support diagnosis in acute abdominal pain, 1254 patients were seen in the six participating German hospitals. 16.8% had appendicitis. History data and physical findings were tested for positive and negative predictive value (PPV/NPV), sensitivity and specificity (SEN/SPE). RESULTS: We had 15% negative appendectomies and 16% perforated appendicies. Only few of the parameters tested show a PPW significantly higher than the prior probability of appendicitis: (PPV/NPV/SEN/SPE in %) rebound tenderness 39/63/91/80, tenderness in the right lower quadrant 36/82/95/70, pain right lower quadrant at presentation 34/77/94/70, onset of pain right lower quadrant 29/49/88/75, rigidity 28/9/84/95, guarding 26/43/87/76. All other parameters had a lower PPV. The combination of three parameters leads to maximal PPV of 85%. CONCLUSION: Very few symptoms are helpful in diagnosing appendicitis: the pain related symptoms (spontaneous pain, tenderness and rebound tenderness, guarding) and the history of the pain hint at an appendicitis. A structured and complete medical history and physical examination focussing on these few symptoms, a systematic combination of these and possibly ultrasonography will improve diagnostic accuracy.

Abdomen, Acute↗
PubMed1992

A 3-year cohort study on short-term effects of air pollution in Germany. 1. Influences of medication and season.

A 3-year cohort study which started in September 1987 investigates the effect of air pollution in adult patients with chronic obstructive airway disease. Of 108 patients recruited during the pilot phase in 1987 only eight patients had left the study prematurely. The most important components of the study are the daily peakflow measurements and a diary on medication and symptoms. In a preliminary analysis the influence of medication and season has been analyzed for the period September 1988 to June 1989 for 53 patients. In general, the reactions to seasonal changes were small. However, a significant decrease in peak-flow values by about 5% was found for the months of May and June compared to December for patients with chronic bronchitis, emphysema and asthma.

Aged↗
PubMed1990

Galvanotaxis of human granulocytes: electric field jump studies.

The static and dynamic responses of human granulocytes to an electric field were investigated. The trajectories of the cells were determined from digitized pictures (phase contrast). The basic results are: (i) The track velocity is a constant as shown by means of the velocity autocorrelation function. (ii) The chemokinetic signal transduction/response mechanism is described in analogy to enzyme kinetics. The model predicts a single gaussian for the track velocity distribution density as measured. (iii) The mean drift velocity induced by an electric field, is the product of the mean track velocity and the polar order parameter. (iv) The galvanotactic dose-response curve was determined and described by using a generating function. This function is linear in E for E less than EO = 0.78 V/mm with a galvanotaxis coefficient KG of (-0.22 V/mm)-1 at 2.5 mM Ca++. For E greater than EO the galvanotactic response is diminished. This inhibition is described by a second term in the generating function (-KG.KI(E-EO)) with an inhibition coefficient KI of 3.5 (v) The characteristic time involved in directed movement is a function of the applied electric field strength: about 30 s at low field strengths and below 10 s at high field strengths. The characteristic time is 32.4 s if the cells have to make a large change in direction of movement even at large field strength (E-jump). (vi) The lag-time between signal recognition and cellular response was 8.3 s. (vii) The galvanotactic response is Ca++ dependent. The granulocytes move towards the anode at 2.5 mM Ca++ towards the cathode at 0.1 mM Ca++. (viii) The directed movement of granulocytes can be described by a proportional-integral controller.

Calcium↗
PubMed1989

[Clinical test of various oral applications of hydrogen peroxide].

Hydrogen peroxide in 3 various kind of applications were used for 3 weeks to treat gingivitis and periodontitis: 3% for mouth rinsing, 3 X daily (treatment at home, not clinical controlled), 3% for pocket washing (clinical controlled) and as Gingivox-strip (10%) 3 X weekly (clinical controlled). The therapeutical success of the 3 tested modifications of application was uniformity, on gingivitis better than on periodontitis. In spite of change for the worse of clinical condition after termination of therapy the first level of inflammation was after 24 weeks yet not reached.

Gingivitis↗