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Biomedical subjects

J Seifert

Publications and source records attributed to J Seifert.

At least 145 records · Page 8Linked to original sources
PubMed1980

[Efficacy of intravenous gammaglobulin in bacterial infections in Surgical Patients. Results of a controlled, randomized clinical study (author's transl)].

The efficacy of intravenous gammaglobulin injections against postoperative bacterial infections was investigated in a prospective randomized, controlled clinical trial in 150 patients. It was found that after postoperative administration of 20 g i. v. gammaglobulin (Intraglobin) the preoperative serum levels had already been attained on the third day (without gammaglobulin they were lower than before operation on the 8th postoperative day). By means of this substitution it was possible to reduce the number of local infections (p less than 0.01) where moderate risk existed. With more persistent infections the incidence of septicemic complications were lower (p less than 0.05). On the basis of these results the application for certain indications of high doses of intravenous gammaglobulin discussed.

Clinical Trials as Topic↗
PubMed1980

Are bloodflow changes after selective proximal vagotomy responsible for a necrosis in the gastric wall?

Animal experiments were performed to investigate bloodflow distribution before and after selective vagotomy to explain gastric mucosa necrosis found in some patients after vogtomy. Flow measurements were made using the microsphere technique. Changes in the microcirculation were determined under basal and stimulated conditions (250 mg 2-desoxy-D-glucose). After selective vagotomy a reduction in bloodflow of up to 50% could be observed in all layers of the stomach. There were no differences in the bloodflow along either the lesser or greater curvature under basal conditions. In the stimulated stomach, however, the increase in bloodflow along the lesser curvature was higher, although the vessels of this region were mostly altered by SPV operative procedure. From these results it can be concluded that a reducton of arterial input after selective proximal vagotomy is probably compensated for by intramucosal or submucosal anastomoses. Therefore, necrosis in the gastric wall is not due to SPV but probably to other accompanying diseases.

Animals↗
PubMed1980

Effect of temperature on nitrification intensity in soil.

The temperature dependence of nitrification can be expressed by the Arrhenius equation while the time course of nitrate production can be expressed by the Gomperz function. These two findings served as a basis for a mathematical model which makes it possible to calculate nitrate production in the soil even when the temperature changes once or more times during the incubation.

Ecology↗
PubMed1980

Lack of correlation between induction of adjuvant arthritis and changes in metabolism and disposition of phenylbutazone in rats.

Phenylbutazone disposition after intravenous injection of 50 mg/kg was studied in Lewis and AVN rats treated by mycobacterial adjuvant in comparison with untreated animals. Although the arthritic lesions, body weight loss and decline in albumin concentration developed only in the Lewis strain, an increase of the extrapolated volume of distribution, decline in total body clearance and prolongation of the biological half-life of phenylbutazone were found in both strains of rats. Also the content of cytochromes P-450 and b5 was reduced in both Lewis and AVN rats.

Animals↗
PubMed1980

[Does i.v. gamma globulin counteract postoperative bacterial infections? (authors's transl)].

A prospective, randomized clinical study investigated the effectiveness of IV gamma-globulin (GG) against bacterial infections after surgical procedures. As a result of 20 g GG IV, given postoperatively, the average concentration decrease for IgG (25% - 30%) could be balanced as soon as the third postoperative day, the local infection rate was decreased in the low-risk group, and, with the occurrence of long-lasting local infections, the number of patients with simultaneous septic complications was lowered.

Bacterial Infections↗
PubMed1980

[Hemostasis in the liver, lungs, and spleen using an infra-red contact coagulator].

Experiments in rats and dogs showed that bleeding of parenchymal organs can be stopped quickly and reliable by using a recently developed infrared contact coagulator (ICC). Haemostasis of liver parenchyma was established in a shorter time than by usual diathermo-coagulation. Due to this reduced time of coagulation smaller regions of necrosis were observed. Bleeding of the dog's spleen could only be stopped by long time coagulation and caused a severe destruction of the tissue.

Animals↗
PubMed1980

[Oral application of bacterial vaccine for infection prophylaxis (author's transl)].

Guinea pigs were orally and subcutaneously immunized against Pseudomonas aeruginosa. Whereas 93% of untreated control animals died after a subsequent IP infection, vaccinated animals developed an efficient protection. The mortality rate in orally pretreated animals was only 20% - 30%. Some immunological parameters were also improved by vaccination. IgG and IgM concentrations in serum increased, as did the agglutination titer against bacteria. Oral vaccination with heat inactivated pathogenic bacteria seems to be a promising procedure to improve the resistance of patients to bacterial infections.

Administration, Oral↗
PubMed1979

[Extension of graft survival time by means of a modification of the treatment with autologous blood].

A modification of the therapy with patients' own blood was achieved by the application of blood components together with an adjuvant. In a defined experimental rat model it was to be clarified whether it is possible to sensitize animals with an antibody directed against skin together with an adjuvant, in order to produce an anti-antibody, which is able to protect a consecutive skin graft from rejection. In a similar way animals were sensitized with cells from rats previously immunized against skin from the donor. By this treatment it is possible to improve survival time of skin grafts. Whereas the prolongation of survival time after pretreatment with skin antibodies can be explained by an anti-antibody, which was found in the serum of the animals, such an anti-antibody could not be detected in the serum of animals, pretreated with "sensitized" cells. Possibly the treatment with cells induces an unspecific effect, which can be achieved also with normal cells. It is conceivable that this principle of the prolongation of skin graft survival time by immunization with certain components of the blood is not only useful in transplantation immunology, but also in other diseases, i.e. autoimmune diseases or allergic reactions.

Animals↗
PubMed1979

Alterations in metabolism of cytidine components in rat liver after oral administration of butylated hydroxytoluene (in vivo study).

The administration of the antioxidant, butylated hydroxytoluene (BHT) to rats decreased the utilization of [2-14C]orotic acid for the synthesis of cytidine nucleotides in the acid-soluble extract and RNA of the liver. The specific activity of the uridine components was slightly decreased. The depression of the specific activity of the cytidine components depended on the dose of the drug. Simultaneously preformed [U-14C]cytidine in experimental rats was to a higher degree transported to the liver and incorporated into RNA cytosine; its deamination was markedly suppressed. Both phenomena depend on the BHT dose. The concentration of both the uridine and the cytidine components of the acid-soluble extract remained unaffected by the administration of BHT. The utilization of [2-14C]orotic acid for the synthesis of DNA cytosine was depressed after the administration of BHT; by contrast, the specific activity of DNA thymine was higher. The incorporation of [1-14C]palmitic acid into microsomal phospholipids was not substantially influenced over the dose range 25--500 mg BHT/kg. The specific activity of neutral lipids in microsomes increased.

Animals↗