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All Journal QISTINA: Jurnal Multidisiplin Indonesia Jurnal Merah Putih Sekolah Dasar
Katri Nafisa
Universitas Negeri Medan
Religion Humanities Economics, Econometrics & Finance Education Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Nursing Social Sciences

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Uji Aktivitas Antibakteri Ekstrak Daun Jambu Biji (Psidium guajava L.) Terhadap Pertumbuhan Bakteri e.coli Ayyu Rizkia Nasution; Hanna Mawarni Manullang; Katri Nafisa; Raudatul Fadilla; Sania Siregar; Endang Sulistyarini Gultom; Rini Hafzari
QISTINA: Jurnal Multidisiplin Indonesia Vol. 4 No. 2 (2025): December 2025
Publisher : CV. Rayyan Dwi Bharata

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57235/qistina.v4i2.7727

Abstract

Penelitian ini bertujuan menganalisis aktivitas antibakteri ekstrak etanol daun jambu biji (Psidium guajava L.) terhadap pertumbuhan Escherichia coli sebagai alternatif antibakteri alami. Penelitian dilaksanakan di Laboratorium Universitas Negeri Medan menggunakan desain eksperimen laboratorium. Pengujian aktivitas antibakteri dilakukan dengan metode difusi cakram pada konsentrasi ekstrak 50%, 75%, dan 100%. Pengumpulan data dilakukan melalui pengukuran diameter zona hambat, dengan kloramfenikol sebagai kontrol positif dan etanol 96% sebagai kontrol negatif. Hasil penelitian menunjukkan bahwa ekstrak etanol daun jambu biji memiliki aktivitas antibakteri terhadap Escherichia coli pada seluruh konsentrasi yang diuji, dengan peningkatan diameter zona hambat seiring meningkatnya konsentrasi ekstrak. Konsentrasi 100% menghasilkan daya hambat tertinggi. Temuan ini menunjukkan bahwa ekstrak etanol daun jambu biji berpotensi dikembangkan sebagai antibakteri alami, meskipun efektivitasnya masih lebih rendah dibandingkan antibiotik standar.
PERKEMBANGAN INTELEKTUAL PADA ANAK SD NEGERI Anggi Putri Simamora; Anisa Ramadhani; Dewi Pratiwi; Hanna Mawarni Manullang; Katri Nafisa; Raudatul Fadilla
Jurnal Merah Putih Sekolah Dasar Vol. 1 No. 2 (2023): NOVEMBER 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jmpsd.v1i2.56078

Abstract

Elementary school students are children who are still in the intellectual development stage. Intellectual/cognitive is an aspect that must be developed in children. For that, parents and teachers need to understand this aspect of intellectual development. The purpose of writing this article is to examine the intellectual development of elementary school students. This type of research is qualitative research using a literature study design. The findings prove that Every elementary school child will definitely experience intellectual development. Development The intellectual level of elementary school children at the concrete operational stage is around the age of 7 years around 11-12 years old, according to the age of elementary school children. So that we know developments elementary school children, we can find out the characteristics of children's intellectual development based on concrete operational stages. So, by knowing the characteristics of development elementary school students, teachers and parents can know to what extent intellectual development that a school student should or has not gone through basic knowledge and know and can minimize the impact of problems on development child intellectual. and able to provide appropriate assistance efforts. Keywords: Development, Intellectual, Elementary School.
Co-Authors Anggi Putri Simamora Anisa Ramadhani Ayyu Rizkia Nasution Dewi Pratiwi Endang Sulistyarini Gultom Hanna Mawarni Manullang Raudatul Fadilla Rini Hafzari Sania Siregar