Detection of RBC-bound antibodies using flow cytometry and their correlation with HLA polymorphism.

Doctoral education requires sustained engagement with uncertain research problems, repeated evaluation, and long periods of self-directed work. These demands can be intellectually productive, but they also create conditions in which emotional exhaustion, detachment from research, and diminished academic efficacy may accumulate. Large studies and systematic reviews have documented substantial mental-health burdens among doctoral researchers and have linked those burdens to isolation, supervisory relationships, organizational conditions, and the prolonged uncertainty of doctoral work (; ; ; ). Burnout is therefore not only an individual wellbeing issue; it may also affect persistence, research engagement, and the sustainability of doctoral training systems (; ; ). The Chinese doctoral context warrants specific attention. Doctoral candidates may face publication expectations, milestone requirements, career uncertainty, and hierarchical supervisory relationships, while supervisors themselves work within performance-oriented evaluation systems. Research on Chinese doctoral students has identified publication pressure, uncertain progress, financial concerns, and supervisory demands as salient sources of stress (; ). These pressures do not affect all candidates in the same way. Some remain engaged and recover after setbacks, whereas others experience escalating exhaustion and detachment. Explaining this heterogeneity requires attention to both motivational engagement and the resources available for coping. Motivation is central to doctoral persistence because research progress depends heavily on self-regulated effort. Self-Determination Theory (SDT) distinguishes intrinsic motivation, extrinsic regulation, and amotivation and emphasizes that the quality and internalization of motivation matter for sustained functioning (; ). In practice, doctoral students often hold multiple motives simultaneously: curiosity and enjoyment may coexist with career goals, credential value, family expectations, and a desire for professional recognition. The present study therefore focuses on academic motivation as the overall strength and clarity of engagement in doctoral study, rather than treating motivation as purely intrinsic. The construct used here combines interest, perceived instrumental value, and low amotivation; it is not presented as a direct measure of autonomous motivation.