阿维斯塔波莱瑞特厂炉卷轧机新技术

阿维斯塔波莱瑞特厂正在进行一个现代化改造项目，以提高炉卷轧机的生产能力，达到年产100万吨。但是，由于在阿维斯塔波莱瑞特厂炉卷轧机上的现有技术已达到极限，只有通过对轧机及自动化系统进行现代化的改造才有可能提高和增强轧机的利用率和易维护性。     

Exciton-polariton transition induced by elastic exciton-exciton collisions in ultrahigh quality AIGaAs alloys

The stationary and time-resolved polariton radiation in ultrahigh quality AIGaAs layers have been studied. It has been found that elastic exciton-exciton collisions lead to the appearance of a low-energy line of polariton radiation. We show that the rate of exciton-to-polariton transitions caused by elastic exciton-exciton collisions is determined not only by the density of the excitonic gas, but also by its temperature; this is in accordance with existing theoretical predictions. The text was submitted by the authors in English.     

Allogeneic sibling umbilical-cord-blood transplantation in children with malignant and non-malignant disease

Allogeneic bone marrow transplantation is limited by the availability of suitable marrow donors and risk of graft-versus-host disease (GVHD) and opportunistic infection. In an attempt to ameliorate these limitations, umbilical cord blood has been postulated as an alternative source of allogeneic haemopoietic stem cells for transplantation. From September, 1994, umbilical cord blood from sibling donors has been used to reconstitute haemapoiesis in 44 children with acquired or congenital lympho-haemapoietic disorders, neuroblastoma, or metabolic diseases. Patients who had HLA-identical and HLA-1 antigen disparate grafts, had a probability of engraftment at 50 days after transplantation of 85%. No patient had late graft failure. The probability of grade II-IV GVHD at 100 days was 3% and the probability of chronic GVHD at one year was 6%. With a median follow-up of 1.6 years, the probability of survival for recipients of HLA-identical or HLA-1 antigen disparate grafts is 72%. We conclude that umbilical cord blood is a sufficient source of transplantable haemopoietic stem cells for children with HLA-identical or HLA-1 antigen disparate sibling donors with very low risk of acute or extensive chronic GVHD. The feasibility of umbilical-cord-blood transplantation with HLA-2 and HLA-3 antigen disparate sibling donors remains to be determined.     

Monitoring cancer antigen 125 in serum of ovarian cancer patients after administration of 131I-labeled F(ab')2 fragments of OC125 antibody

We evaluated the effect of repeated administration of OC125 F(ab')2 fragments on cancer antigen (CA) 125 determination in 210 serum samples from 30 patients. We found falsely high CA 125 concentrations in 142 (68%) samples, using a homologous CA 125 enzyme immunoassay (EIA) with OC125 antibodies. The Truquant OV2 method, which involves two other murine antibodies, and the IMx CA 125 method, which uses sheep antibodies as capture antibodies, resulted in only slightly increased (false-positive) values in some samples with exceptionally high CA 125 EIA values. We measured falsely low CA 125 values in 37 (18%) samples with the Truquant OV2 method. Interferences could be eliminated by removal of serum IgG. Our results suggest that interferences are to some extent caused by anti-idiotypic IgG induced by OC125 administration. Assays involving nonmurine anti-CA 125 antibodies as capture antibodies seem to be most suited for CA 125 determination after OC125 treatment, but in every case an apparent increase of CA 125 after OC125 infusion should be validated.     

Effect of glutamine on protein synthesis in isolated intestinal epithelial cells

The purpose of this study was to determine the etiologic factors of denture stomatitis. Fifteen subjects with clinical evidence of localized simple denture stomatitis, fifteen subjects without clinical signs of denture stomatitis, and forty-five subjects with clinical evidence of generalized simple denture stomatitis were investigated clinically and mycologically. Subjects were evaluated according to age, sex, duration of denture usage, smoking habits, frequency of denture brushing, overnight denture wearing, pH level of saliva and degree of candidal colonization and candidal formation. Salivary samples and swabs were taken from the palate and the mucosal surfaces of the dentures investigated mycologically in order to identify the yeast colonies. Smears were taken from the palate and investigated in order to identify candidal formation. No statistically significant relationship was found between denture stomatitis and age, sex, duration of denture usage, frequency of denture brushing, overnight denture wearing or pH level of saliva. There was however, a statistically significant relationship between denture stomatitis and denture hygiene, smoking habits, candidal colonization and candidal formation.