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Biomedical subjects

P Netter

Publications and source records attributed to P Netter.

At least 289 records · Page 16Linked to original sources
PubMed1984

Human articular cartilage and fibrocartilage: a study with high-angle x-ray diffraction.

High-angle x-ray diffraction was applied to the study of four meniscal fibrocartilages and 11 articular cartilages from patients suffering from various articular disorders. In eight samples microcrystals were seen, apatite most frequently, CaHPO4 in two instances, calcium pyrophosphate dihydrate (CPPD) in one. These results confirm the association of various crystals in a single joint, and favour their heterogenous partition on collagen fibres.

Adult↗
PubMed1984

Experimental synovitis induced by aluminium phosphate in rabbits. Comparison of the changes produced in synovial tissue and in articular cartilage by aluminium phosphate, carrageenin, calcium hydrogen phosphate dihydrate, and natural diamond powder.

The goal of this experimental study was to examine the effect on articular tissue of tribasic aluminium phosphate (crystalline and amorphous forms) after intraarticular injection in rabbit and to compare it with that of various phlogistic compounds such as carrageenin, calcium hydrogen phosphate dihydrate and diamond powder, as a control. Synovium and cartilage were studied with light microscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive micro-analysis (EDM). Crystalline and amorphous aluminium phosphate could induce a synovitis with articular effusion in rabbits. With TEM, lysosomal inclusions of phagocytosed material were observed. Through SEM coupled with EDM, aluminium associated with phosphate was found in cellular elements.

Aluminum Compounds↗
PubMed1984

Aluminum in the joint tissues of chronic renal failure patients treated with regular hemodialysis and aluminum compounds.

We studied the concentrations of aluminum in the articular tissues of 5 hemodialysed patients treated with aluminum compounds. Aluminum crosses the synovial barrier, is found in synovial fluid (SF) and accumulates in the joint structures (synovial membrane and joint cartilage). The concentrations found in synovial tissue were 2.7 to 10 times control values, in SF 2.5 to 8 times the control concentrations and in cartilage 2.6 times the control concentrations. Transmission electron microscopy showed localization of aluminum in the lysosomal structures and wavelength dispersive microprobe analysis showed aluminum in cellular components associated with phosphate. The possible toxicity of aluminum to joints merits further investigations.

Aluminum↗
PubMed1983

[Passage of nonsteroidal anti-inflammatory agents across the synovial membrane].

The therapeutic effectiveness of non-steroid anti-inflammatory (NSAI) drugs is partly determined by their passage across the synovial membrane. The synovium can be compared to a double barrier the permeability of which to NSAI drugs depends on the degree of inflammation of the joint and on the pharmacokinetic properties of the drugs (lipophilia, pka, protein-binding). A few hours after one single systemic dose, concentrations in the synovial fluid are higher than in serum. During chronic administration, concentrations of NSAI drugs with a short half-life vary less in synovial fluid than in serum. During steady state, free fractions of NSAI drugs with prolonged half-life may be similar in both compartments.

Anti-Inflammatory Agents↗
PubMed1983

[Value of the assay of bone aluminum by pulse polarography].

Pulse polarography has been applied to the determination of aluminium in bone. The sensitivity, selectivity and reproducibility of the method are described. The results of bone aluminium concentrations in controls and in haemodialysed patients treated with aluminium compounds are discussed. Pulse polarography permits very precise measurements of aluminium impregnating bone.

Adult↗
PubMed1983

Diffusion of oxyphenbutazone into synovial fluid, synovial tissue, joint cartilage and cerebrospinal fluid.

The diffusion of oxyphenbutazone into synovial and cerebrospinal fluids and synovium and joint cartilage was investigated in 25 patients receiving short-term treatment. In the synovial fluid, the mean oxyphenbutazone concentration, was 57.1 +/- 13.4% of the plasma level, due to its excellent diffusion into the joint cavity. In synovial tissue, the oxyphenbutazone level was higher in patients with severe inflammation than in those with no or little inflammation. Penetration into joint cartilage is less than into synovial tissue. In cerebrospinal fluid the concentration was close to the level of free plasma oxyphenbutazone. The findings show increased diffusion of oxyphenbutazone towards its site of action in inflammation.

Adult↗
PubMed1983

Anxiolytic effects of drugs: approaches, methods and problems.

The paper reviews in the first part some of the most important contributions to pharmacological anxiety research of related scientific disciplines, namely human pharmacopsychology, animal behavioral pharmacology, neuropharmacology and pharmacopsychiatry. In the second part the main methodological problems encountered in research on psychopharmacology of anxiety are treated. The problems discussed refer to the assessment of anxiety, to the definition of the anxiety state and to the problem of unspecific drug actions and of response variability to drugs.

Animals↗
PubMed1983

Influence of sensory suggestibility on treatment outcome in headache patients.

In 45 headache patients the relationship between sensory suggestibility and three measures of treatment effect--ratings on (1) intensity of headaches; (2) efficacy of drugs, and (3) physician's competence--was investigated in a double-blind long-term crossover study. Subjects scoring high on sensory suggestibility clearly showed more relief of headaches upon the analgesic as well as upon the placebo. The physician's competence was rated higher by high-suggestible patients, whereas ratings on drug efficacy were low in all patients. The seemingly controversial behavior of high-suggestible patients was interpreted as a call for continuation of the physician's efforts in spite of the relief the patients already achieved.

Adult↗
PubMed1983

Activation and anxiety as represented by patterns of catecholamine levels in hyper- and normotensives.

Types of hyper- and hyposympathetic plasma catecholamine response and types of pronounced epinephrine and pronounced norepinephrine response were identified within samples of hyper- and normotensive subjects each. Hypersympathetic subjects emerged as more active and well-adapted than hyposympathetic ones in both groups. Among hypertensives, subjects producing high levels of epinephrine and low levels of norepinephrine scored higher on state and trait anxiety scales than those with a reverse catecholamine pattern, while no such differences could be demonstrated between respective normotensive types.

Achievement↗
PubMed1982

The cytochrome oxidase subunit I split gene in Saccharomyces cerevisiae: genetic and physical studies of the mtDNA segment encompassing the 'cytochrome b-homologous' intron.

We have constructed a refined genetic and physical map of 38 oxi3 mutations. With the help of the rho- clones derived from 'short' and 'long' genes, pairwise crosses between mutants, estimations of their reversion frequencies and analyses of mitochondrially synthesized proteins, we have characterized and localized several mutants in the exon A4 and in the intron aI4. We present genetic and physical evidence that in the 'long' gene the exon A5 is split into at least three quite distinct exons, A5-1, A5-2 and A5-3 where numerous mutations are localized. We suggest that a novel 56 Kd polypeptide, which accumulates in some cis-dominant oxi3- mutants results from the translation of the upstream exons and the downstream aI4 intron.

Base Sequence↗
PubMed1982

Critical sequences within mitochondrial introns: cis-dominant mutations of the "cytochrome-b-like" intron of the oxidase gene.

We have established the DNA sequence of two cis-dominant mutations located in the fourth intron, a14, of the yeast mitochondrial gene oxi3. These mutations prevent the synthesis of subunit I of cytochrome oxidase. Both mutations affect a very short DNA sequence located several hundred base pairs from the intron-exon junctions. An identical sequence is found in the cob-box gene; and this sequence is critical for the excision of the cytochrome b intron. Our interpretation is that this short sequence represents a common signal that must be recognized by the box7-encoded mRNA maturase, in conjunction with the mitochondrial ribosome, to splice out the introns in the two nonhomologous genes, cob-box and oxi3.

Base Sequence↗
PubMed1982

[Unwanted pregnancy as a cause of child development disorders?].

Relationships between unwanted pregnancies and behavioural disturbances in the infant were analyzed in 6117 pregnancies examined within a prospective multicenter collaborative study on pregnancy and child development. Prior to analyzing their consequences, correlates and causes of undesired pregnancy liable to operate as confounding factors by exerting direct influences on disturbances in the fetus or newborn were identified. This was achieved by stratification of the total group according to variables of obstetric history relevant to desire of pregnancy. Although not only social factors but also psychoneurotic behaviour was found to be partly responsible for rejection of pregnancy, it could be demonstrated that none of these factors unfavourably influenced physical health or psychomotor development of the infant, but merely seemed to show a few associations with the infant's aggressive or regressive tendencies at the age of 18 or 36 months.

Child Behavior Disorders↗
PubMed1982

Inflammatory effect of aluminium phosphate on rat paws.

The aim of this experiment was to determine the inflammatory effect of aluminium phosphate on the rat paw and to compare it with those of carrageenan, calcium hydrogen phosphate dihydrate and natural diamond powder. At the probability threshold of the various tests used there was a significant increase in volume of the treated paw relative to the control paw for all the substances at all times, except for the two concentrations of diamond (effect no longer significant from 30 min on), of calcium phosphate (not significant from 2 h), and of aluminium phosphate (not significant from 24 h). The effects were not significantly different between diamond and calcium phosphate (both concentrations). The effects of aluminium phosphate were significantly different from those of the two until at least 2 h after the injection ; there was no significant difference between the two doses of this substance. The kinetics of the effects produced by carrageenan differed from the kinetics of the other materials, its effects were not significantly different from those produced by aluminium phosphate until 2 h and later. The inflammatory effect that we have demonstrated in this study is added information suggesting that in addition to apatite, calcium pyrophosphate dihydrate, and sodium monourate, aluminium compounds can play a role in the unexpected appearance of inflammatory manifestations in haemodialysed patients with chronic renal insufficiency treated with aluminium gels.

Aluminum Compounds↗
PubMed1982

[Measurement of aluminium in bone by pulse polarography (author's transl)].

Pulse polarography has been applied to the determination of aluminium in bone. The sensitivity, selectivity and reproducibility of the method are described. The results of bone aluminium concentrations in controls and in haemodialysed patients treated with aluminium compounds are discuted. Pulse polarography permits very precise measurements of aluminium impregnating bone.

Adult↗