Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:2.1.1.69 (BMT)
 2,655 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The liver is a major target organ of graft-versus-host disease. We have induced graded intensities of acute GVHD to minor histocompatibility antigens in a well-characterized murine bone marrow transplant model and analyzed hepatic pathology one month after BMT. Nuclear-magnetic-resonance relaxation times and proton spectra were compared to systemic clinical disease, serum biochemistries, and histologic findings. T2 relaxation times correlated directly with the intensity of histologic abnormalities, but the hepatic histology remained mild even in animals with moderate GVHD. In contrast, NMR proton spectra of hepatic tissue showed large decreases in metabolite levels (acetate and glycogen) in animals with moderate systemic disease despite mild hepatic histology. We conclude that NMR of the liver can be used to differentiate hepatic from systemic GVHD in this model and may help to elucidate the differential effects of GVHD in various target organs.
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PMID:Nuclear magnetic resonance of hepatic graft-versus-host disease in mice. 225 43

99 patients with arterial hypertension (AH) were studied: 17 patients with pheochromocytoma, 37 with aldosteronoma, 4 with corticosteroma, 38 with essential hypertension. Control group included 16 healthy subjects. The investigation was performed by means of a NMR-tomograph BMT-1100 ("Brucker", FRG) in axial and frontal planes according to Spin Echo (SE) technique with TR = 2.0 s, TE = 34 ms. Qualitative (visual) as well as quantitative criteria for evaluation of adrenal glands state were developed. Normal size of adrenal glands, relative intensity of their signal and T2 were calculated. The data obtained proved that relative intensity of the signal is a highly informative parameter for differential diagnosis of adrenal gland tumors (its value of less than 1.0 is evidence of cortex lesion, and that of more than 1.4--of medulla lesion). High informative value of MR-tomography for evaluation of adrenal glands state in patients with AH is proved by comparative data obtained by other methods, such as computer tomography aortography and histomorphology.
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PMID:[Clinical use of magnetic resonance tomography for assessing adrenal function in patients with arterial hypertension]. 285 44

We have been successful in achieving phosphorus NMR in-vivo spectra of the fetal lung in an animal model. We used pregnant guinea-pigs with a gestational age of 45 to 65 days. The spectra were recorded on a Bruker tomograph (BMT 24/30) with a field strength of 2.35 T. The spectra showed a typical pattern. After recording the animals were sacrificed and the lungs were prepared for electron microscopic examinations. In the spectra peaks were found which appeared to be phosphorylcholine and phosphatidylcholine. For one peak it could be observed that the relative signal intensity increased with increasing gestational age as well as with increasing lung maturity. This could not be observed for other peaks. So the lecithin of the surfactant in the tissue of the fetal lung appears to be directly accessible through phosphorus in-vivo NMR spectroscopy. The peaks found appear already before the lamellar bodies are present in the pneumocytes type II.
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PMID:In-vivo NMR spectroscopy of the fetal lung in guinea-pigs. 324 Dec 91

Thirty seven patients with arterial hypertension of renal genesis (chronic diffuse glomerulonephritis, chronic pyelonephritis, renal cystic disease and congenital abnormalities) were subjected to NMR-tomography. The comparison group comprised 12 patients with essential hypertension and 18 normal individuals constituted the control group. The examination was effected in the axial, frontal and sagittal planes using the BMT-1100 NMR-tomograph (Brucker, FRG) with the magnetic intensity of 0.235 T, the coil diameter of 60 cm, and the working frequency of 9.95 MHz. The technique made it possible to draw conclusions as to the presence or absence of the kidneys, their form, size, location and the structure of their cortex and medulla. The anatomo-tomographic picture of the kidneys in patients with chronic diffuse glomerulonephritis without renal insufficiency resembled that in cases of essential hypertension. In patients with chronic pyelonephritis the kidney contour was uneven and when renal insufficiency was present the kidneys were small and the borderline the cortex and the medulla was poorly differentiated. The technique proved especially informative in renal cystic disease and congenital abnormalities (renal aplasia and hypoplasia). The results obtained were compared with the data provided by other examination techniques.
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PMID:[Diagnostic potentials of NMR tomography of the kidneys of patients with symptomatic renal hypertension]. 406 86

This communication reviews the use of undersampling techniques to acquire NMR signals. Undersampling transforms bandpass free induction decay (FID) signals, centered at high frequencies, into lowpass signals or bandpass signals centered at much lower frequencies. Consequently, the analog electronic stages that perform the demodulation can be eliminated, gaining in stability and reducing the phase distortion while maintaining an equivalent or better signal to noise ratio when an adequate sampling rate is chosen. The technique has been tested on a BRUKER BIOSPEC BMT 47/40, and the results show that undersampling could be used to process NMR and MRI signals, extending the range of applications of the 'digital radio' techniques to NMR and MRI apparatus.
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PMID:Potential use of the undersampling technique in the acquisition of nuclear magnetic resonance signals. 1150 25

In this paper, we present a method that permits the application of a direct digital receiver based on undersampling techniques to NMR and MRI scanners working with incoherent excitation pulses, and we evaluate the performance of such receivers in the acquisition and reconstruction of images. The method has been tested on a BRUKER BIOSPEC BMT 47/40, and the results show that undersampling can be used to process NMR and MRI signals, and that it correctly reconstructs images without loss of information, extending the range of applications of 'digital radio' techniques to NMR and MRI systems working with high-intensity magnetic fields. We also describe a series of tests performed to validate the application of undersampling to NMR systems and an algorithm to compensate the phase fluctuations due to the incoherent excitation pulses.
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PMID:Undersampling to acquire nuclear magnetic resonance images. 1523 88