Search PubMed⌕ Search

Biomedical subjects

M Jensen

Publications and source records attributed to M Jensen.

At least 109 records · Page 6Linked to original sources
PubMed1990

[Neuron-specific enolase (NSE) and squamous cell carcinoma antigen (SCC) as serum markers in the diagnosis of bronchial carcinoma].

In 54 patients with untreated, histologically proven lung cancers (18 squamous cell, 15 small cell, 12 large cell carcinomas and 9 adenocarcinomas), the serum antigens NSE and SCC were measured. 43 (71) patients with benign lung diseases served as controls for serum levels of SCC (NSE). With a cut-off level of 2.5 (15.0) ng/ml elevated serum values were observed in 4.6% (4.2%) of the control collectives. We determined the sensitivity of both antigens in the diagnosis of the different histological cancer types. The highest sensitivity of 80% was observed for NSE in patients with small cell cancer, whereas non-small cell cancers were associated with only 11-27% elevated serum concentrations. The sensitivity for SCC was highest in patients with adenocarcinoma (44%) and attained only 33% in squamous cell cancer patients. We could not confirm a selectivity of serum-SCC for squamous cell differentiation in lung cancers. Combined serum determination of SCC and NSE increased the sensitivity in the diagnosis of non-small cell lung cancer but not of small cell cancer compared to the NSE determination alone. The data suggest a correlation of serum SCC levels to the tumour stage in squamous cell carcinoma patients.

Adult↗
PubMed1990

Magnetic resonance imaging of the bone marrow following treatment with recombinant human erythropoietin in patients with end-stage renal disease.

We used magnetic resonance imaging (MRI) to study vertebral bone marrow in hemodialysis patients during treatment with recombinant human erythropoietin (rHuEPO). We found changes in T1 relaxation times and image contrast within 14 days after starting treatment, before any response was seen in the hemoglobin concentration in peripheral blood. The increase in T1 relaxation times, together with earlier reported changes observed with localized magnetic resonance spectroscopy, indicate an alteration in cellular composition of the hemopoietic bone marrow with an increase in the amount of hemopoietic active tissue. MRI may be a useful, non-invasive way of evaluating bone marrow response to different modes of rHuEPO administration and dosage.

Anemia↗
PubMed1990

The vitamin E distribution in serum, liver, adipose and muscle tissues in the pig during depletion and repletion.

This study was designed to examine the storage capacity for vitamin E in liver, adipose tissue and skeletal muscle of growing pigs during a period of supplementation and of depletion. Therefore, biopsy specimens of these tissues and samples of serum were frequently taken from 7 pigs throughout the experimental period. After a 7-week period on a diet highly supplemented with vitamin E (405 mg/kg), a significant increase (p less than 0.001) in the concentration of this vitamin was observed in all tissues sampled. The highest level (102.9 +/- 26.2 mg/kg) was observed in the liver. After 2 days of depletion the concentration of vitamin E in the liver had fallen by 80%, whereas the concentration in the fat and muscle remained unchanged during 1 week of depletion. The serum vitamin E value rose significantly (p less than 0.001) after 1 week on the supplemented diet and then remained at about 7 mg/l throughout the supplementation period and decreased (p less than 0.001) after 2 days on a nonsupplemented diet. Generally, the serum vitamin E levels among growing pigs are between 2 and 3 mg/l. The results show that the serum and liver values were correlated when the serum level was within this range. Moreover, it is clearly demonstrated that the concentrations of vitamin E in serum and liver reflect the immediate nutritional status of the animal, whereas the vitamin concentrations in adipose and skeletal muscle tissue reflect its long-term nutritional history.

Adipose Tissue↗
PubMed1989

Structure-function relationships of elongation factor Tu. Isolation and activity of the guanine-nucleotide-binding domain.

The guanine-nucleotide-binding domain (G domain) of elongation factor Tu(EF-Tu) consisting of 203 amino acid residues, corresponding to the N-terminal half of the molecule, has been recently engineered by deleting part of the tufA gene and partially characterized [Parmeggiani, A., Swart, G. W. M., Mortensen, K. K., Jensen, M., Clark, B. F. C., Dente, L. and Cortese, R. (1987) Proc. Natl Acad. Sci. USA 84, 3141-3145]. In an extension of this project we describe here the purification steps leading to the isolation of highly purified G domain in preparative amounts and a number of functional properties. The G domain is a relatively stable protein, though less stable than EF-Tu towards thermal denaturation (t50% = 41.3 degrees C vs. 46 degrees C, respectively). Unlike EF-Tu, its affinity for GDP and GTP, as well as the association and dissociation rates of the relative complexes are similar, as determined under a number of different experimental conditions. Like EF-Tu, the GTPase of the G domain is strongly enhanced by increasing concentrations of Li+, K+, Na+ or NH+4, up to the molar range. The effects of the specific cations shows similarities and diversities when compared to the effects on EF-Tu. K+ and Na+ are the most active followed by NH+4 and Li+ whilst Cs+ is inactive. In the presence of divalent cations, optimum stimulation occurs in the range 3-5 mM, Mg2+ being more effective than Mn2+ and Ca2+. Monovalent and divalent cations are both necessary components for expressing the intrinsic GTPase activity of the G domain. The pH curve of the G domain GTPase displays an optimum at pH 7-8, similar to that of EF-Tu. The 70-S ribosome is the only EF-Tu ligand affecting the G domain in the same manner as that observed with the intact molecule, although the extent of the stimulatory effect is lower. The rate of dissociation of the G domain complexes with GTP and GDP as well as the GTPase activity are also influenced by EF-Ts and kirromycin, but the effects evoked are small and in most cases different from those exerted on EF-Tu. The inability of the G domain to sustain poly(Phe) synthesis is in agreement with the apparent lack of formation of a ternary complex between the G domain.GTP complex and aa-tRNA.(ABSTRACT TRUNCATED AT 400 WORDS)

Binding Sites↗
PubMed1989

Preparation and developmental toxicity of monoclonal antibodies against rat visceral yolk sac antigens.

Thirty clones producing monoclonal antibodies (MCAs) to rat visceral yolk sac (VYS) antigens have been prepared. These MCAs localized by immunofluorescence in the VYS endoderm in vitro and were tested for developmental toxicity by intraperitioneal injection of ascites fluid into pregnant rats on day 9 of gestation. Five of the hybridomas produced MCAs that induced embryonic death, malformation, and growth retardation; the other MCAs had no developmental toxicity. Five MCAs, three teratogenic and two nonteratogenic, were tested for their ability to inhibit pinocytosis in the isolated day 17-VYS. Only the teratogenic MCAs were inhibitory, providing further evidence for the hypothesis that teratogenic antibodies interfere with the nutritional supply to the embryo.

Animals↗
PubMed1989

Allograft vs. exposure in the treatment of scalds--a prospective randomized controlled clinical study.

In a randomized controlled clinical trial (RCCT) the healing rate, infection and late cosmetic/functional results were investigated in 48 children admitted to hospital with scalds. They were treated with either exposure treatment (EP) or lyophilized allograft (LA). Healing rate was improved with LA treatment. The infection tendency was identical within the two groups. Late cosmetic/functional results were superior, with LA treatment compared to exposure treatment but only in the subgroup of superficial dermal scalds.

Bandages↗
PubMed1989

The vitamin E concentration in pig muscle biopsy specimens. A methodological study.

Two litters of weaned pigs were housed in the same stable and fed a commercially available diet for five months. When the pigs weighed about 90 kg, surgical biopsy specimens (about 3 g), were obtained from the superficial portion of the biceps femoris muscle. In addition, samples weighing about 100 mg were taken from the deep portion of this muscle by the needle biopsy technique. The surgically obtained biopsies were divided into two pieces, one for determination of the vitamin E concentration in whole wet muscle and the other for determination in pure muscle and debris (blood, connective tissue and fat). The latter piece was freeze-dried and the pure muscle was separated from the debris by dissection. The vitamin E concentration in whole wet muscle correlated (p less than 0.05) with that in pure muscle tissue. However, in individual biopsy specimens the vitamin E values in pure muscle were sometimes similar to those in debris and sometimes very different. The range of values in pure muscle was much narrower (7.1 to 12.0 mg/kg), than in debris, where it was 7.1 to 41.8 mg/kg dry weight (dw). These data show that the vitamin E concentration can be measured in very small muscle samples obtained by the needle biopsy technique, provided that the analysis is performed on pure muscle freed from blood, connective tissue and fat. It is clear that pure muscle is preferable to whole wet muscle for this analysis irrespective of the size of the sample.

Animals↗
PubMed1989

Student desires for a university drug education program.

A questionnaire was designed to determine the type of drug education program most desired by undergraduate students attending a major university. The survey was to provide the basis for a comprehensive drug education program. The 101 item questionnaire elicited responses from 656 undergraduates in categories ranging from knowledge base to credible information sources. The analysis of student desires as they relate to program design is included in this article. The students strongly believed the university should provide a drug education program. In particular they desired a credit course dealing with both drugs and alcohol. They also wanted regularly published articles on drugs in school publications. The most credible knowledge sources were PhDs and MDs. Students also wanted contact with former drug users. More than half the students believed that values clarification and "coping skills" training would decrease their drug use. In general more women than men were likely to utilize such resources.

Female↗
PubMed1989

Gastrointestinal transit of technetium-99m-labeled cellulose fiber and indium-111-labeled plastic particles.

We introduce two new nondigestible solid markers for gastrointestinal transit measurements. One is technetium-99m-labeled cellulose fiber [99mTc]CF, the other is indium-111-labeled plastic particles [111In]PP of 2- to 3-mm diameter. In six healthy male volunteers gastric emptying and small intestinal transit of the two markers were obtained simultaneously. Large intestinal transit of [111In]PP was also obtained. Technetium-99m CF had acceptable stability properties in the proximal gastrointestinal segments. Indium-111 PP was almost completely stable in all segments. Mean gastric emptying time was 1.13 +/- 0.24 hr (mean +/- s.d.) for [99mTc]CF and 1.94 +/- 0.78 hr for [111In]PP. The difference was significant (p less than 0.05). Mean small intestinal transit time was 3.85 +/- 0.61 hr (mean +/- s.d.) for [99mTc]CF and 4.03 +/- 0.34 hr for [111In]PP. The difference was not significant (p less than 0.5). Mean large intestinal transit time of [111In]PP was 23 +/- 11 hr (mean +/- s.d.). We also suggest a simple deconvolution principle for the interpretation of the small intestinal and the large intestinal transit data.

Adult↗
PubMed1989

The influence of regular physical activity on the cell-mediated immunity in pigs.

The influence of moderate regular physical activity on the cell-mediated immunity was studied in growing pigs. Ten animals were subjected to physical training on a large animal treadmill, and 10 were kept in their pens throughout a 12-week experimental period. Regardless of whether the pigs underwent training or not, a whole blood lymphocyte stimulation test performed at 3 stages of the experiment revealed an equal ability of the cells to respond to stimulation induced by pokeweed mitogen and phytohaemaglutinin. The influence of serum from the pigs of the trained and untrained groups was studied in a stimulation test with purified mononuclear cells obtained from 2 healthy control pigs. The results indicated that no additional serum factors released by the physical training altered the blastogenic response of these lymphocytes. It is concluded that moderate exercise should not be regarded as a stressor which alters the cellular immunity in pigs.

Animals↗
PubMed1988

Vitamin E requirement of growing swine.

The vitamin E requirement of growing pigs was estimated on the basis of prevention of morphological signs of deficiency. Five groups of pigs were fed a barley-based diet low in vitamin E that contained 16 mg of DL-alpha-tocopheryl acetate equivalents/kg and .1 ppm of Se for 4 wk (depletion I). This period was followed by 7 wk of supplementation, during which the groups received 0, 15, 45, 135 and 405 mg of supplemental DL-alpha-tocopheryl acetate/kg diet. Finally, all the animals were fed the low vitamin E diet for 7 wk (depletion II). To follow the vitamin E concentration in serum and tissues, blood samples were collected and biopsies were taken from skeletal muscle, adipose tissue and the liver throughout the experiment. The peak vitamin E value was observed in the liver, followed by the adipose tissue and then skeletal muscle. The liver responded rapidly to changes in dietary vitamin E intake, whereas the adipose tissue and the skeletal muscle reacted at a slower rate. In spite of the abundant occurrence of the different vitamin E isomers in the feed, alpha-tocopherol was the main isomer detected both in the serum and in the tissues. The activity of glutathione peroxidase in serum increased with age but was independent of the serum vitamin E concentration. In the unsupplemented group all animals suffered from the vitamin E and Se deficiency syndrome (VESD) in an acute or chronic form. A total of 31 mg of DL-alpha-tocopheryl acetate/kg diet (16 mg of naturally occurring vitamin E and 15 mg as supplementation) equivalent to 2.5 IU vitamin E/g polyunsaturated fatty acids (PUFA) was enough to prevent the development of VESD. In view of the large individual variations of vitamin E concentration in target organs, and to obtain a certain safety margin for prevention of VESD in growing pigs, a supplement of 30 mg of DL-alpha-tocopheryl acetate/kg diet is recommended.

Animals↗
PubMed1988

Antacid in the prevention of upper gastrointestinal bleeding in burns.

In a retrospective survey the efficacy of a prophylactic antacid regime with aluminiumhydroxyde/magnesiumcarbonate (LINK, A.L. pharma) was investigated in 157 patients with major burns. Only 14% developed any sign of upper gastrointestinal stress ulceration, and only 5% revealed clinically significant bleeding indicating blood transfusion. No case developed haemodynamic instability, nor need for acute surgery, and no one died from haemorrhage. We found the regime economically attractive, and with few and reversible side effects. We conclude that our prophylactic regime is highly effective.

Adult↗