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  1. Fulltext Highly sensitive detection of low-concentration sodium chloride solutions based on a gold-coated prism in Kretschmann setup
    Na'imah S, Apsari R, Masruroh, Yasin M, Wadi Harun S
    Heliyon, 2024 Jun 30;10(12):e32349.
    PMID: 38975194 DOI: 10.1016/j.heliyon.2024.e32349
    A gold-coated Kretschmann setup has been constructed and explored as a surface plasmon resonance (SPR) platform, specifically tailored for the detection of low-concentration sodium chloride (NaCl) solutions. The setup employs a BK7 prism coated with a 50 nm gold layer, serving as a plasmonic layer, to induce resonance. This resonance arises from the interplay between light waves and free electrons propagating at the interface of two media. The experimental findings reveal a notable resonance angle shift of 10° when the NaCl concentration is varied from 0 to 2.5 %. Furthermore, angle interrogation provides insightful details about the sensor's response to changes in the refractive index, showcasing a commendable sensitivity of 2400°/RIU, a high level of linearity at 0.9771, and an impressive resolution of 0.217 %. The demonstrated capabilities of this sensor underscore its potential for widespread applications, particularly in the monitoring of salt concentration across diverse domains such as seawater analysis, food processing, and fermentation processes. The robust performance and precision of this proposed sensor position it as a valuable tool with promising prospects for addressing the needs of various industries dependent on accurate salt concentration measurements.
  2. Fulltext Barrier to contraceptive use among childbearing age women in rural Indonesia
    Rohmah N, Yusuf A, Hargono R, Laksono AD, Masruroh, Sujoso ADP, et al.
    Malays Fam Physician, 2021 Nov 30;16(3):16-22.
    PMID: 34938389 DOI: 10.51866/oa1020
    Introduction: The contraceptive prevalence rate in Indonesia has not experienced much improvement, which has led to an increase in the number of pregnancies. This study aimed to analyse the barriers to contraception use among women of childbearing age in rural Indonesia.

    Methods: This study used a cross-sectional design with data from the Indonesian Demographic and Health Survey (IDHS) of 2017. The independent variables were age, employment status, education, marital status, wealth status, health insurance and parity. The dependent variable was the use of contraception. The statistical significance was set at p <0.05 using bivariate analysis and binary logistic regression.

    Results: The study showed that the age group of 45-49 years (OR 0.199; 95% CI 0.149-0.266), secondary education (OR 2.227; 95% CI 2.060-2.514), women married/living with their partner (OR 43.752; 95% CI: 35.484-53.946), wealth status: middle (OR 1.492; 95% CI 1.400-1.589) and multipara (OR 2.524; 95% CI: 2.328-2.737) exhibited the increased use of contraception among women of childbearing age in rural Indonesia.

    Conclusion: The variables proven to represent obstacles to contraceptive use among women of childbearing age in rural Indonesia include old age, no education, no husband/partner, poverty and already having one child.

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