Plasmid promiscuity and chastity and its uses

Typological classification of attitudes toward premarital sexual behavior among Chinese undergraduates

BACKGROUND

Premarital sexual behavior (PSB) is a controversial topic in China. However, in recent times, changes in attitudes have led to PSB being more common among college students. This study investigated the attitudes of Chinese undergraduates toward PSB to identify whether a typological classification exists among them.

METHODS

A total of 278 undergraduate students from two public universities in Mainland China completed a 17-item survey that included five dimensions( emotions, responsiveness, sexual health, sexual freedom, and condemnation) on attitudes toward PSB. Data were collected online from April 2023 to July 2023.

RESULTS

The PSB questionnaire demonstrated good reliability and construct validity in this study, with a Cronbach's α of 0.759 and a KMO value of 0.769. Meanwhile, a series of models were estimated specifying one through five latent classes and three typologies on the attitude were identified: "Affective,""Avoidant," and "Open." After the best fitting model was determined, multiple analysis of variance testing of different factors such as gender, year of study and where one came from were found to have significant effects on attitude complexity (p < .01).

CONCLUSION

This research will contribute to the dissemination of information on PSB in China, which will be helpful in understanding relevant issues associated with PSB.

Plasmid stability and ecological competence in recombinant cultures

The instability of cell cultures containing plasmid vectors is a major problem in the commercial exploitation of molecular cloning techniques. Plasmid stability is influenced by the nature of the host cell, the type of plasmid and/or environmental conditions. Plasmid encoded properties may confer a selective advantage on the host cell but can be an energy drain due to replication and expression. Stability of recombinant cultures ultimately may be determined by the cost to benefit ratio of plasmid carriage. The relative competition between plasmid containing and plasmid-free or indigenous populations can determine the degree of dominance of recombinant cultures. The use of inocula in biotechnological processes in which dynamic environmental conditions dominate may also result in instabilities resulting from the characteristics of the ecosystem. In such dynamic conditions plasmid stability is just one contribution to culture stability. Strategies to enhance plasmid stability, within such environments, based on manipulation of physiological state of host cells, must consider the responsiveness or plasticity of both cells and populations. The robustness of cells or the responses to stresses or transient environmental conditions can influence the levels of instability detected; for example, instability or mutation in the host genome may lead to enhanced plasmid stability. Competition among subpopulations arising from unstable copy number control may determine the levels of recombinant cells in open versus closed fermenter systems. Thus the ecological competence (ability to survive and compete) of recombinant cells in dynamic or transient environments is fundamental to the understanding of the ultimate dominance or survival of such recombinant cultures and may form the basis of a strategy to enhance or control stability either in fermenter systems or dynamic process environments. The creation of microniches in time and/or space can enhance plasmid stability. Transient operation based on defined environmental stresses or perturbations in fermenter systems or in heterogeneous or dynamic environments found in gel immobilized cultures have resulted in enhanced stability. Spatial organization resulting from immobilization has the additional advantage of regulated cell protection within defined microenvironments and controlled release, depending on the nature of the gel, from these microenvironments or microcosms. This regulation of ecological competence allied to the advantages of microbial cell growth in gel microenvironments combined with the spatial organization (or juxtapositioning of cells, selective agents, nutrients, protectants, etc.) possible through immobilization technology offers new strategies to enhance plasmid and culture stability.