Adorján Cristea

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Frequent reproductive casualties (spontaneous abortions, stillbirths, prematurity and low birth weight, congenital malformations) were recorded in a group of 264 women who had viral hepatitis (VH) during pregnancy. The proportion of such events was much higher in the HBsAg-positive women (80%) than in the seronegative ones (44%) and it varied according to(More)
Perennially stratified salt lakes situated in the Transylvanian Basin (Central Romania) were surveyed for the diversity of culturable halophilic archaea (Fam. Halobacteriaceae). The physical and chemical characteristics of the waters indicated that all the investigated lakes were meromictic and neutral hypersaline. Samples collected from upper,(More)
Seroconversion to different viral, chlamydial, rickettsial and mycoplasma antigens was followed up in 134 children aged 0-6 years, hospitalized with different respiratory diseases. Parainfluenza viruses type 1, 2 and 3 and adenoviruses appeared to be involved in the etiology of most of the cases; respiratory syncytial virus was often found to play a role in(More)
A mathematical methodology is suggested which allows the a priori calculation of the risk of premature delivery, by a formula relying on the scores attributed to different specific risk factors (maternal virus infections included). The scores are estimated either directly, or starting from the scores of nonspecific factors. The statistical significance of(More)
Various techniques are described for the preparation of complement-fixing(CF) antigen from the cell-associated phase of two strains of human cytomegalovirus. Preliminary results regarding the preparation of CF antigen from extracellular virus are also presented. The qualities and shortcomings of each of the biological preparations obtained by the different(More)
Starting from the elementary epidemiological processes, the authors develop an evolution equation of the function generating the probability distribution of the number of viral hepatitis (VH) patients and susceptible subjects. Evolution equations for moments of order 1 and 2 - resulting from the equation of the generating function-are also discussed on the(More)
The individuals are distributed in 9 risk groups (adults and children), in which an HIV transmission way is predominant. Taking into account a simplified graph of the HIV infection evolution, kinetic equations for the number of individuals from each risk group--situated in various stages of HIV infection--are written. The approximative solutions of these(More)
The neurons of the network used for the simulation of a viral epidemic correspond to the individuals of the community. The activation state of the neurons reflects the contagious state of the diseased persons. Variable thresholds are introduced for the differentiation of the neuronal non-activation states (susceptible or immune subjects). The thresholds are(More)