Preliminary Exploration of Cyanobacteria in Peat Waters, Palangka Raya, Central Kalimantan, Indonesia

Cyanobacteria were formerly known as blue-green algae and are currently considered algae-like Gram-negative bacteria belonging to the bacterial kingdom. Lack of scientific information on the presence and distribution of cyanobacteria species in peat water habitats, particularly in Central Kalimantan, Indonesia, which has extensive peat waters. This study aims to conduct a preliminary exploration as an initial action for further research on the diversity and distribution of cyanobacteria species in peat water ecosystems. The results of the study reported that 5 species of cyanobacteria were found to be present in the peat water habitat in Palangka Raya, Central Kalimantan, Indonesia, belonging to the orders Chroococcales, Oscillatoriales, and Synechococcales. The cyanobacteria species found in this study include Microcystis sp., Chroococcus sp., Oscillatoria sp., Arthrospira sp., and Pseudanabaena sp. These findings indicate that further research needs to be carried out to explore, identify and isolate cyanobacteria from peat waters to obtain more detailed and clear data as a basis for optimizing the potential and benefits of cyanobacteria for sustainable life

Biopython: Comparing the DNA Polymerase I (polA) Gene of Thermophilic, Mesophilic, and Psychrophilic Bacteria

Biopython is a specialized Python tool for computational molecular biology. Various computational molecular analysis that can be performed using Biopython, such as reconstructing phylogenetic trees, multiple sequence analysis, generating complementary sequences, counting amino acids, etc. This technical notes paper describes in detail the procedures computational DNA sequence analysis using Biopython. The DNA polymerase I (polA) gene sequences of bacteria were used in this study to compare the differences between Thermophilic, Mesophilic, and Psychrophilic bacteria

Variety of Cell Size of Cosmarium spp. and Euastrum spp. (Desmidiaceae, Charophyte) from the Aquatic Environment around Palangka Raya, Central Kalimantan, Indonesia

Desmids (Desmidiaceae) is the family of green algae that characterized by cells that are shaped of two symmetrical semicells and it is estimated that there up to 12,000 species of Desmids. Cosmarium and Euastrum are two genera of Desmids that considered as the most representative taxa of this family. They are vary widely in size and shape of the cells. Based on the results of preliminary observations, in the aquatic enviroment around University of Palangka Raya is rich in microalgal diversity including Desmids. Cell size and shape are the most important points to be known to study the microalgae. This research is aimed to study the variety of cell size of Cosmarium spp. and Euastrum spp. from the aquatic environment around Palangka Raya. The results of this study show that the Cosmarium cells have the dimension of 17-80 μm long and 14-57 μm wide; Euastrum cells have the dimension of 24-89 μm long and 17-80 μm wide

Implementasi electronic learning material (ELEMA) berbasis student-centered learning mata kuliah zoologi invertebrata

Tujuan Penelitian ini adalah: (1) Menganalisis peningkatan keterampilan berpikir kritis mahasiswa melalui implementasi ELEMA berbasis student-centered learning dan (2) Menganalisis respon mahasiswa terhadap implementasi ELEMA berbasis student-centered learning pada mata kuliah Zoologi Invertebrata. Rancangan penelitian ini adalah One Group Pretest-Posttest Design. Sampel penelitian ini adalah mahasiswa aktif semester 3 (tiga) Program Studi Pendidikan Bologi FKIP Universitas Palangka Raya yang memprogramkan mata kuliah Zoologi Invertebrata. Data keterampilan berpikir kritis mahasiswa dianalisis secara kuantitatif menggunakan rumus n-gain. Data diolah menggunakan program Microsoft Excel 2019. Hasil penelitian menunjukkan bahwa keterampilan berpikir kritis mahasiswa yang dibelajarkan dengan ELEMA pada mata kuliah Zoologi Invertebrata meningkat dengan rerata gain sebesar 0,71 dalam kategori Tinggi. Respon mahasiswa terhadap implementasi ELEMA dalam perkuliahan Zoologi Invertebrata menunjukkan rata-rata perolehan skor 86,5 yang menunjukkan respon sangat baik

Viariasi Ukuran Sel Cosmarium spp. dan Euastrum spp. (Desmidiaceae, Charophyte) dari lingkungan akuatik sekitar Universitas Palangka Raya

Desmids (Desmidiaceae) is the family of green algae that characterized by cells that are shaped of two symmetrical semicells and it is estimated that there up to 12,000 species of Desmids. Cosmarium and Euastrum are two genera of Desmids that considered as the most representative taxa of this family. They are vary widely in size and shape of the cells. Based on the results of preliminary observations, in the aquatic enviroment around University of Palangka Raya is rich in microalgal diversity including Desmids. Cell size and shape are the most important points to be known to study the microalgae. This research is aimed to study the variety of cell size of Cosmarium spp. and Euastrum spp. from the aquatic environment around Palangka Raya. The results of this study show that the Cosmarium cells have the dimension of 17-80 μm long and 14-57 μm wide; Euastrum cells have the dimension of 24-89 μm long and 17-80 μm wide.Desmids (Desmidiaceae) merupakan famili alga hijau yang dikarakteristikan dengan sel berbentuk dua semisel simetris dan diperkirakan terdapat hingga 12.000 spesies. Cosmarium dan Euastrum adalah dua genera Desmids yang dianggap sebagai taksa paling representatif dari famili ini. Kelompok Desmids sangat bervariasi dalam ukuran dan bentuk sel. Berdasarkan beberapa penelitian sebelumnya, di lingkungan perairan sekitar Universitas Palangka Raya kaya akan keanekaragaman mikroalga termasuk Desmids. Ukuran dan bentuk sel merupakan poin terpenting yang harus diketahui untuk mempelajari mikroalga. Penelitian ini bertujuan untuk mempelajari variasi ukuran sel Cosmarium spp. dan Euastrum spp. dari lingkungan perairan sekitar Universitas Palangka Raya. Hasil penelitian menunjukkan bahwa sel Kosmarium memiliki dimensi panjang 17-80 μm dan lebar 14-57 μm; Sel euastrum memiliki dimensi panjang 24-89 μm dan lebar 17-80 μm

Biopython: Comparing the DNA Polymerase I (PolA) Gene of Thermophilic, Mesophilic, and Psychrophilic Bacteria

Biopython is a specialized Python tool for computational molecular biology. Various computational molecular analysis that can be performed using Biopython, such as reconstructing phylogenetic trees, multiple sequence analysis, generating complementary sequences, counting amino acids, etc. This technical notes paper describes in detail the procedures computational DNA sequence analysis using Biopython. The DNA polymerase I (polA) gene sequences of bacteria were used in this study to compare the differences between Thermophilic, Mesophilic, and Psychrophilic bacteria

The Identification of Euglenids (Euglenophyceae, Euglenophyta) from the Peat Waters of Palangka Raya, Indonesia

The aim of this study was to identify and describe the Euglenids (Euglenophyceae, Euglenophyta) from the peat waters of Palangka Raya, Central Kalimantan, Indonesia. This study revealed that 8 species of Euglenids were found in the study sites which belong to 3 genera, namely Euglena, Lepocinclis, and Phacus. The Euglenid species identified include Euglena gracilis G.A. Klebs 1883, Euglena mutabilis F. Schmitz 1884, Lepocinclis acus (O.F.Müller) B.Marin & Melkonian 2003, Lepocinclis ovum (Ehrenberg) Lemmermann 1901, Lepocinclis spirogyroides B.Marin & Melkonian 2003, Phacus cordatus (Pochmann) Zakryś & Lukomska 2015, Phacus helikoides Pochmann 1942, and Phacus orbicularis Hübner 1886. The eight Euglenid species found in this study have never been reported before, thus these findings provide additional new data regarding algae diversity in peat waters of Central Kalimantan, Indonesia

Influence of Water Table and Peat Thickness on Dissolved Organic Carbon of Tropical Peat Soil with Sulfidic Substratum from Central Kalimantan, Indonesia

Peatlands are important due to their high carbon storage, their role in suppressing climate change processes, and their importance for local and global communities’ livelihood. Large amounts of organic carbon pools in peatlands can be released into the environment as gaseous emitted carbon and lost through waterways (fluvial). The carbon released through the water stream consists of organic and inorganic forms and is partly in the form of CO2 and CH4 gases. The organic form consists of dissolved organic carbon (DOC) and particulate organic carbon, where DOC is the most dominant organic carbon in water sourced from peatlands. This research's objectives were to study the DOC concentration of peat water resulting from the hydrological condition's difference and the peat thickness overlaying the sulfidic substratum. The study was carried out in the Pangkoh area of Pulang Pisau district of Central Kalimantan. Peat water is taken on PVC pipes installed on each plot representing different peat thicknesses (deep, moderate, and shallow peat) at a depth of 25, 50, 100, 150, 200, and 250 cm from the soil surface. The water sampling was conducted on the peak wet season, during the transition from wet season to dry season and during the peak dry season. The results showed that DOC was influenced by peat thickness, depth of sulfidic material, and groundwater level. The release of DOC is higher from the deep peat than from the thin and moderate peat. The difference in DOC concentration between peat thickness is also related to the electrical conductivity of the peat water. The results showed a negative correlation between electrical conductivity and DOC concentration. The negative correlation was significant in the observation of the rainy and dry seasons, while in the transitional season, it was not significant