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Biomedical subjects

A Saran

Publications and source records attributed to A Saran.

At least 91 records · Page 5Linked to original sources
PubMed1989

Electroencephalographic changes and other indices of neurotoxicity with haloperidol-lithium therapy.

This prospective study was undertaken in order to establish indices of possible neurotoxicity due to the combination of lithium with haloperidol and a combination of lithium with other neuroleptics. Twenty-one subjects who were receiving neuroleptic-lithium combination were studied. Of them, 14 had a primary affective disorder-manic phase, and 7 had schizophrenia as judged by Feighner criteria. The subjects were evaluated on clinical, neuropsychological measures and EEG at baseline and 10-14 days after addition of lithium to the neuroleptic regimen. Of 11 subjects receiving the haloperidol-lithium combination, 5 (45.4%) showed abnormal responses on EEG. Of these 5 subjects, 3 showed abnormal photic responses, and 2 showed slowing in posterior alpha activity. These photoparoxysmal and photomyoclonic responses are indicative of cerebral pathophysiology resulting from the interactive effect of the haloperidol-lithium combination. The photic and other associated EEG abnormalities reported may be the earliest indication of neurotoxicity. No significant changes were observed in the EEG in 10 subjects treated with other neuroleptic-lithium combinations. In a statistical comparison the haloperidol-lithium combination had significantly more frequent EEG changes than the combination of lithium with other neuroleptics. This study presents sufficient evidence from reported photic and other associated EEG changes to pursue further investigation of neurotoxicity due to haloperidol-lithium therapy. Such a study should employ a larger number of subjects, random assignment of subjects to treatment and control groups, and blind evaluation of data.

Adult↗
PubMed1988

Antidepressants not effective in headache associated with minor closed head injury.

The author compared the response to amitriptyline in headache associated with depression between twelve patients having primary depression (control group) and ten patients with depression after minor closed head injury. In the primary depression group, there was significant reduction in headache and improvement in depression. The minor closed head injury group did not show significant reduction in headache or improvement in depression. The latter group, upon further treatment with phenelzine also showed no reduction in headache or improvement in depression. Results of this study question the earlier reports of the usefulness of amitriptyline in chronic muscle contraction headache and depression associated with minor closed head injury.

Adult↗
PubMed1986

Dose-response relationship of radiation-induced harderian gland tumors and myeloid leukemia of the CBA/Cne mouse.

Transplantation of harderian gland cells from CBA/-Cne mice into the fat pad of isogenic recipients was used for a quantitative in vivo study of cell survival and risk of transformation after x-ray irradiation (1-7 Gy). A survival curve for gland cells was generated in vivo with a D0 of 1.83 Gy and an extrapolation number of 7.23. Subsequently, the dose-response curve for lesions observed in nodules after cell transplantation was compared with that for lesions observed in glands irradiated in situ. A high incidence of epithelial hyperplasias with severe dysplasia was observed in transplantation nodules after x-irradiation. Gland tumors were significantly induced in whole-body irradiated animals; the tumors reached a maximum incidence after doses of 3 Gy. The risk of transformation per surviving cell was estimated both for dysplastic lesions and for tumors. These results approximated a dose-squared relationship in both cases, suggesting a common induction mechanism at the cellular level. Myeloid leukemia was observed at all doses in whole-body irradiated mice, and the maximum tumor incidence was reached at doses around 3 Gy.

Animals↗
PubMed1986

Radiation-induced mouse liver neoplasms and hepatocyte survival.

Transplantation of hepatocytes from CBA/Cne mice into the fat pads of isogeneic recipients has been used for the quantitative in vivo study of cell survival and risk of transformation after x-ray irradiation (1-7 Gy). A survival curve for liver cells was generated in vivo with a D0 of 3.08 Gy and an extrapolation number not significantly different from 1. Data on liver tumor incidence in whole-body irradiated CBA/Cne and C57BL/Cne X C3H/HeCne (BC3F1) mice are also reported. A statistical analysis of trend in both cases proved a significant induction of tumors by x-rays mainly for doses above 2 Gy. The risk of transformation per surviving cell was estimated for both mouse strains. For CBA mice the data points suggested the presence of a linear component in the dose-effect curve at low doses, whereas for BC3F1 mice a quadratic expression appeared to provide a better description of the points from 1 to 6 Gy. The data of this study suggested that liver tumors can be induced by radiation in mouse strains with either a high or low spontaneous hepatoma incidence.

Animals↗
PubMed1984

Camels' milk: for drinking only?

Camels' milk, women's milk and cows' milk were kept at 30 degrees C and refrigerated at 4 degrees C. This explains the necessity to immediately freeze milk if it needs to be kept even for a few days. Cows' milk remained good for days if stirred and then turned sour, enabling the making of cheeses and butter. Camels' milk did not sour at 4 degrees C for up to 3 months. This means that camels' milk is mainly good only for drinking, as was promised to this animal by the Prophet.

Animals↗
PubMed1981

Comparative efficacy of three antibiotic products for the treatment and prevention of subclinical mastitis during the dry period.

The comparative efficacy of a product containing 500 mg benzathine cloxacillin (Orbenin D.C.). another product containing 100 mg nafcillin, 300 mg procaine benzylpenicillin and 100 mg dihydrostreptomycin (Nafpenzal D.C.) and a third product containing 250 mg cephalonium (Cepravin D.C.), in the elimination and prevention of mastitis due to gram-positive microorganisms during the dry period was investigated in 1253 cows located in 14 herds in Israël. Although more uniform results were observed after treatment with Nafpenzal D.C. differences among herds were rather large. The mean cure rate for Staphylococcus aureus quarter infections was 81.4 per cent. New S. aureus infections which occurred between drying off and post calving sampling time were found in 7.0 per cent of the quarters. Dry period therapy reduced infection level with S. aureus from 13.5 per cent of quarters to 8.0 per cent. A similar proportional decrease was found in infection level due to non-agalactiae Streptococcus quarter infections.

Animals↗
PubMed1980

Molecular orbital studies on the structure of nucleoside analogs. III. Conformation of 3-deazapyrimidine nucleosides.

PCILO computations ahve been carried out on the conformational properties of 3-deazapyrimidine nucleosides namely: 3-deazauridine and 3-deazacytidine. These nucleoside analogs result as a consequence of the replacement of N(3) by a carbon atom and they become nucleoside antibiotics having cytostatic and antiviral properties. Both C(2')-endo and C(3')-endo sugar geometries have been considered and the results indicate that the conformational preferences of these nucleoside antibiotics are very similar to those of their parent nucleosides and more particularly so in the situations that occur in aqueous solutions. The important biological significance of the results has been discussed.

3-Deazauridine↗
PubMed1978

Molecular orbital studies on nucleoside analogs. II. Conformation of 6-azapyrimidine nucleosides.

PCILO (Perturbative Configuration Interaction using Localised Orbitals) computations have been carried out for three 6-azapyrimidine nucleosides, 6-azauridine, 6-azacytidine and 6-azathymidine, for both C(2')-endo and C(3')-endo pucker of the sugar ring. The results indicate a syn (chiCN=180 degrees) conformation followed by chiCN=90 degrees and gg conformation for C(3')-endo 6-aza analogs as compareed to the anti (chiCN=0 degrees) and gg conformation preferred by the corresponding pyrimidine nucleosides. For C(2')-endo sugar geometry, 6-azauridine and 6-azacytidine prefer, respectively, chiCN=0 degrees (anti) and phi C(4')-C(5')=60 degrees C (gg) and chiCN-240 degrees (syn) and phi C(4')-C(5')=120 degrees. The corresponding nucleosides, uridine and cytidine, show a preference for syn (chiCN=240 degrees) and gg and anti(chiCN=0 degrees) and gg , respectively. The X-ray crystallographic conformations of 6-azauridine and 6-azacytidine have been attributed to intermolecular hydrogen bonding and crystal packing forces. The results of PMR, CD and ORD studies on 6-azauridine and 6-azacytidine in aqueous solutions are in agreement with the PCILO predictions.

Azacitidine↗
PubMed1978

Molecular orbital studies on the structure of nucleoside analogs. I. Conformation of 8-azapurine nucleosides.

PCILO (perturbative configuration interaction using localized orbitals) computations have been carried out for the conformational properties of 8-azapurine nucleosides. The results indicate an anti conformation for Xcn and a gg conformation for phiC(4')-C(5') for C(2')-endo 8-aza analogs compared to the syn and gg conformation for the corresponding purine nucleosides. For C(3')-endo sugar puckering, both molecules prefer the syn conformation due to intramolecular hydrogen bonding between O(5')-H of the sugar and N(3) of the base, the preference being more profound in 8-aza analogs. The crystallographic conformation 8-azaadenosine has been attributed to crystal forces. The available NMR data on 8-azapurine nucleosides are in agreement with the PCILO predictions.

Adenosine↗
PubMed1977

Distribution of lactate dehydrogenase isoenzymes in normal and inflamed bovine udders and milk.

The patterns of distribution of lactate dehydrogenase (LDH) isoenzymes were determined in normal and inflamed bovine udder tissues, in normal and mastitic milk-leucocytes and serum. LDH1 was the most common isoenzyme found in all the types of tissues examined, normal tissues contained the lowest proportions of LDH5 whereas the inflamed tissues and leucocytes from mastitic milk showed a higher proportion of LDH4 and LDH5. It seems that the origin of the elevated LDH in mastitic milk is the leucocytes and the parenchyma cells of the udder. The significance of the shift in the molecular forms of LDH isoenzymes is discussed in relation to possible alternations in energy metabolism in the inflamed bovine mammary gland.

Animals↗
PubMed1976

Application of the Limulus amoebocyte lysate test to the detection of gram-negative bacterial endotoxins in normal and mastitic milk.

The Limulus in vitro endotoxin assay was evaluated as a possible method for the prompt detection and measurement of endotoxins of Gram-negative bacteria in milk. Quantitative results were obtained following 1 h incubation of Limulus lysate and 10-fold dilutions of milk from normal quarters and from quarters of cows with clinical mastitis. This test was capable of detecting endotoxins associated with acute coliform mastitis. A positive Limulus reaction was recorded at dilutions ranging from 1: 10(4) to 1: 10(9) of milk from quarters affected with clinical mastitis due to coliform bacteria. Milk from normal quarters and from clinical mastitis cases due to Gram-positive bacteria was consistently negative to the test when diluted 1:10(3).

Animals↗