Non-destructive inspection of carbon fibre-reinforced plastics using eddy current methods

The possibilities and limitations of eddy current methods for the inspection of carbon fibre-reinforced plastics have been investigated. The electrical properties of these composites lead to modifications of current methods applied to metals; in particular the required frequencies are much higher, 1-30 MHz for weave and 10-500 MHz for...

Membrane technology in carbon dioxide removal

The application of membrane technology in carbon dioxide removal was investigated for a number of different gasstreams. These gasstreams have been defined in the framework of the Dutch national programme on carbon dioxide removal and are typical of streams occurring in present and future electricity generation plants based on fossil fuels ...

Effect of wheat bran on excretion of radioactively labeled estradiol-17 Beta and estrone-glucuronide injected intravenously in male rats

Urinary and fecal estrogen excretion were studied in male rats fed a non-fiber wheat starch diet (dietary fiber < 1%; NF group; n = 4), a low-fiber wheat flour diet (dietary fiber 2%; LF group; n = 4) or a high-fiber wheat bran diet (dietary fiber 11.6%; HF group; n = 3). Short-term effects of the experimental diet on estrogen excretion were...

Induction of hyperplasia in the bladder epithelium of rats by a dietary excess of acid or base: Implications for toxicity/carcinogenicity testing

In previous studies we observed an increased incidence of hyperplasia in the epithelium of the urinary bladder of rats fed cereal-based stock diet supplemented with 6% monosodium glutamate (MSG) for 3 months. Hyperplasia was not enhanced, however, when 6% MSG was fed in a purified casein diet. Further studies have been conducted to identify the...

In vivo distribution of organophosphate antidotes: Autoradiography of [14C]HI-6 in the rat

In order to visualize the distribution of HI-6 in the rat after iv administration, autoradiographic experiments were carried out with [14C]HI-6, labeled at the carbon of the carboxamide moiety. Autoradiography clearly confirms penetration of HI-6 into the central nervous system. Considerable radioactivity was found in the cerebrum, the...

Studies of carbonaceous cenospheres from fluidised-bed combustors

FIy ash from fluidised bed combustion of bituminous coals contains carbonaceous cenospheres of several forms including thick-walled opaque, transparent with a skeletal structure and 'balloons' without skeletons. The influence on cenosphere formation of particle size, temperature, heating rate, petrographic composition, etc. is reviewed. The...

Haemodynamic changes in the cerebral circulation of the cat during occlusion of the middle cerebral artery

In a group of 21 cats, the middle cerebral artery pressure (MCAP) was recorded by means of a catheter introduced into the artery at its origin, just distal to the occlusion. The effects of hypertension, hypercapnia, and hypocapnia were studied. In a group of five cats, both middle cerebral arteries (MCA) were catheterized and the pressure was...

Thymus dependent immune competence; effects of ageing, tumour bearing and thymic humoral function

Differential binding of methyl benzimidazol 2 yl carbamate to fungal tubulin as a mechanism of resistance to this antimiotic agent in mutant strains of Aspergillus nidulans

Chemicals/CAS: benomyl, 17804-35-2; carbon 14, 14762-75-5; colchicine, 64-86-8; fuberidazole, 3878-19-1; griseofulvin, 126-07-8; mebendazole, 31431-39-7; melatonin, 73-31-4; nocodazole, 31430-18-9; parbendazole, 14255-87-9; podophyllotoxin, 518-28-5; tiabendazole, 148-79-8; vinblastine, 865-21-4; Benzimidazoles; Carbamates; Colchicine, 64-86-8;...

Metabolic conversion of methyl benzimidazol 2 yl carbamate (MBC) in Aspergillus nidulans

Methyl benzimidazol 2 yl carbamate was metabolized by Aspergillus nidulans mycelium to two metabolites, one of which was identified as methyl 5 hydroxybenzimidazol 2 yl carbamate. This compound was further converted to a second metabolite which was not identified. Conversion rate was highest when the culture medium was depleted of nutrients....

Pitfalls in determination of acetylcholine from brain by pyrolysis gas chromatography/mass spectrometry

Demethylation by sodium benzenethiolate has been used to analyse mixtures of isotopic variants of acetylcholine (ACh) by gas chromatography/mass spectrometry (GC/MS). The present experiments show that demethylation by pyrolysis is also suitable for the simultaneous determination of deuterium labelled variants of ACh by means of GC/MS. However,...

Protection against toxic compounds: chemical and technological aspects

Early increase of amino acid transport in stimulated lymphocytes

Chemicals/CAS: 2 amino 2 methylpropionic acid, 62-57-7; carbon, 7440-44-0; thymidine, 50-89-5; tritium, 10028-17-8; Aminoisobutyric Acids; Carbon Isotopes; Lectins; Thymidine, 50-89-5; Tritium, 10028-17-8

The influence of several sterols on the conversion of β-sitosterol into cholesterol in the cockroach

Chemicals/CAS: carbon, 7440-44-0; cholesterol, 57-88-5; Carbon Isotopes; Cholesterol, 57-88-5; Sterols

Induction of cytochrome formation and stimulation of oxidative dissimilation by hemin in Streptococcus lactis and Leuconostoc mesenteroides

Aerobic glucose dissimilation of washed cells of Streptococcus lactis grown in peptone-glucose-yeast extract medium is characterized by the formation of large amounts of lactic acid, a small amount of acetic acid, and traces of acetoin: a corresponding amount of oxygen is taken up. Aerobic metabolism by washed cells of S. lactis and Leuconostoc...