It is widely believed that the dynamics of surface-bound fullerene molecules is not fully understood because current theoretical analyses do not include chargetransfer phenomena. A new theoretical approach to describe charge transfer and chemisorption processes for fullerenes on gold surfaces has been developed. The method is based on extensive semiempirical calculations that provide a consistent description of charge transfer and adsorption phenomena. Our theoretical approach is applied for analyzing complex dynamics of fullerene-based molecular machines, known as nanocars. It is found that the charge transfer makes the rolling of nanocars' wheels a preferable mode for translational motion because of the complex interactions with the metal surfaces. The physicalchemical aspects of the rolling mechanism are discussed.
Objective
Barriers to removal of long-acting reversible contraception (LARC) threaten reproductive self-determination, but their influence on contraceptive behaviors is not well understood. We describe perspectives of women in Western Kenya concerning LARC removal barriers.
Study design
We used a qualitative descriptive approach with conventional content analysis to analyze transcripts for content and themes from eight focus group discussions (
n
= 55 participants) and one client journey mapping workshop (
n
= 9 participants) with women ages 18–49 in Western Kenya who were currently using or had formerly used contraceptives.
Findings
Our primary themes concerned women's experience of LARC removal barriers and the impact on their behaviors and attitudes towards contraception. Women described providers being unwilling to remove LARC, regardless of rationale (including expiration, seeking pregnancy, or experiencing intolerable side effects) or demanding unaffordable fees. Women were reluctant to try LARC for fear of having to use the method for its entire lifespan even if they did not like it. Women saw LARC removal barriers as increasing their risk of unintended pregnancy through non-replacement of expired devices and fostering distrust in the health system.
Conclusion
Barriers to LARC removal may discourage utilization of LARC and contraceptive services generally, which can undermine women's efforts to achieve reproductive self-determination.
Implications
Our findings affirm the importance of timely LARC removal to ensure that family planning programs uphold women's reproductive autonomy.
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