High School Students Conception Profile on The Cell Material in Tuban Regency using Three-Tier Test Method

Conception is a person's understanding of something being observed. Cell material is prone to misconceptions owing to the fact that the material is unable to be sensed, moreover there are many sub-concepts that need to be fully apprehended. This research aims to describe the high school students conception profile on the cell material in Tuban Regency using the Three-Tier Test method, to describe the differences in the conception of high school students on cell material in Tuban Regency, and to describe the differences in the conception profile of students by school area. This is a descriptive-quantitative research using Three-Tier Test instrument. Data collection was carried out online via google form and interviews via google meet. 60 high school students of class XI in Tuban Regency were involved as the target of the research. The results showed that the conception profile of high school students on cell material in Tuban Regency mastered the concept of 53.21%, did not master the concept of 14.01% and misconceptions 32.78%. The highest of school that did not mastering concept was High School 1 Bancar at 31.30% and the highest misconception was High School 3 Tuban at 36.48%. Students experienced the highest misconception on the endocytosis concept, which was 63.33%. The cause of misconceptions is from student itself, worksheet book, and the teacher’s explanation. Keywords: Conception Profile, Cell, Three-Tier Test

Isolasi Dan Karakterisasi Bakteri Selulolitik Biopori Sebagai Upaya Awal Percepatan Proses Pengomposan

The purpose of this study was to obtain cellulolytic bacterial isolates isolated from leaf litter in absorption holes biopori FMIPA Unesa and obtain the most optimal cellulolytic bacterial isolates in cellulose degradation. This research was an observational study and the data were analyzed descriptively. Stages of the study began with bacterial isolation, cellulolytic ability testing, and characterization of cellulolytic bacterial isolates. Bacterial isolation was carried out by the pour plate method, isolation was carried out by the streak plate method, cellulolytic testing was carried out using Carboxy Methyl Cellulose media which was given Congo red 1%. While the isolation characterization was done morphologically, physiologically, and biochemically. The results obtained 15 isolates of cellulolytic bacteria that were tested for their ability to degrade cellulose. Cellulolytic test results showed that 6 isolates, namely BS1, BS7, BS10, BS11, BS14, and BS15 had a cellulolytic index of 0.8, 0.8, 0.8, 0.8, 0.8, 0.8. and 1. Isolates BS15 is the most optimal isolate in cellulose degradation with characteristics of the punctiform colony, yellow pigmentation, entire edge, convex elevation, optical opaque and smooth surface, produces catalase enzymes, is non-motile and can ferment in glucose and starch but cannot ferment lactose and also a Gram-negativ