Tinjauan Molekuler dan Epidemiologi Mutasi pada Virus SARS-CoV-2

The SARS-CoV-2 virus which is the cause of the COVID-19 pandemic since the end of 2019 has undergone many mutations that gave rise to several variants of concern (VOC) with higher transmission, virulence, and ability to evade the immune system than the initial variant (wild-type). Until now, there are four variants included in the VOC of the virus, namely alpha, beta, gamma and delta variants. The increased transmission and virulence of these VOCs were associated with mutational changes in the spike protein, which is the structure of the virus that plays a role in binding to host cells. In this article, we conduct a literature review on VOCs from the SARS-CoV-2 virus related to mutations that occur and their impact on the viral binding process. To gain an understanding of the impact of mutations in these variants, we also reviewed the structure of the spike protein and the process of viral entry into host cells. Keywords: viral mutation, variants of concern (VOC), COVID-19, SARS-CoV-2.

Pemberian Kompos Jerami dan Tepung Cangkang Telur pada Tanaman Kangkung di Desa Mallinrung Kec. Libureng Kab. Bone Provinsi Sulawesi Selatan

This study was to determine the type of organic fertilizer treatment that can give the best results on kale plants. The independent sample t-test was used to compare the two types of organic fertilizer treatments. The treatments include straw compost and eggshell flour with each treatment being repeated 30 times. The dose of fertilizer used was 26.810 g for each kale plant. The results showed that there was no significant difference between the two treatments of organic fertilizers which were given both straw compost and eggshell flour with a dose of 26.810 g on the parameters of the observation of fresh harvest weight and power save plant.Keywords: straw compost, eggshell flour, kale plants

Komposisi Bakteri Saluran Pencernaan Belut Rawa (Synbranchus Bengalensis)

Eels are a group of snake- shaped fish belonging to the Synbranchidae. Bacteria in groups of fish such as eels can be found on the body surface and digestive tract. Some bacteria are pathogenic, while a number of other bacteria are beneficial, but researches in this topic has not been optimal. This study examined the bacterial composition of the digestive tract of swamp eel (Synbranchus bengalensis) using descriptive exploratory methods. The results showed that the composition of bacteria found in the digestive tract of swamp eels was diverse but dominated by gram-positive bacteria; BR2, BR3, BR4, BR5. In addition, some of these bacteria belong to the group of proteolytic bacteria; BR2 and BR4, lipolytic bacteria; BR2, and amylolytic bacteria; BR1 which hydrolyzes digestive enzymes can act as probiotics in the digestive tract of swamp eels (Synbranchus bengalensis).Keywords: swamp eels, microflora digestive, Synbranchus bengalensis

Distribusi Temporal dan Spatial Arthropoda Pada Berbagai Jenis Tumbuhan Liar di Agroekosistem

The purpose of this research were to (1) analyse the temporal and spatial distribution of arthropods in the cassava and eggplant agroecosystem areas. (2) Analysing the temporal and spatial distribution of arthropods in the maize agroecosystem. This research was divided into 2 stations, the first station which is near the trail in the eggplant and corn agroecosystem, while for the second station on the corn agroecosystem, the two research locations are in Maccorawalie Village, Watang Sawitto District, Pinrang Regency, South Sulawesi. This research use the analytical method to analyse the observations and also identify the families of each arthropod found, then count the number of arthropods in each species and measure the diversity and abundance of each wild plant found at station 1 and station 2 in the morning and afternoon. The translation of the results obtained from the results of data collection at two stations in two data collection times (morning and afternoon) in the day, where the morning is 06.00-8.00 WITA Zone, while in the afternoon at 16.00-17.30 WITA zone. This is due to abiotic factors such as temperature and humidity, where the temperature in the morning is 23°C with 92% humidity, while the afternoon temperature is 25°C with 77% humidity. Arthropods have a different temporal distribution because this is related to the biological clock in each Arthropod. Biological clock allows Arthropods to determine when to work and rest. The existence of a rhythm in insects resulted in the division of two living groups, known as diurnal (active during the day) and nocturnal. Abiotic factors in the form of light intensity, temperature and humidity, affect the activity patterns of insects that have a certain temperature range, light intensity and humidity in Maccorawalie Village, Watang Sawitto District, Pinrang Regency.Keywords: temporal distribution, spatial distribution, arthropods, agroecosystem.

Keanekaragaman dan Karakteristik Morfometrik Ikan Air Tawar di Sungai Lais Kecamatan Lais Kabupaten Bengkulu Utara Provinsi Bengkulu

This study aims to determine the diversity and characteristics of freshwater fish in Sungai lais, lais sub-district, Bengkulu Utara district, Bengkulu province. This research was conducted using survey methods and to obtain primary data taken into the field by direct capture. Samples were taken in sungai lais, lais sub-district, Bengkulu Utara regency is done by dividing 3 stations. Measurement of fish morphometric characteristics is done by measuring fish body parts including, total length (PT), standard length (PB), head length (PK), height (TB), body width (LB) and tail height (TE). The results showed that the diversity index which is found in the lais river which is classified as low, with a diversity index at station A 0.666, station B 0.724 and station C 0.522. The types of fish found in this study consisted of 8 species namely Cyprinus carpio (goldfish), Osteohilus vittatus (palau fish), Anabas testudienus (fish betok), Channa striata (cork fish), Oreochromis niloticus (tilapia), Oreochromis mossambicus (tilapia fish), Trighogaster trichopterus (sepat fish), and Clarias batrachus (catfish).Keywords: Diversity, Fish, Lais River, Morphometric Characteristic

Efektivitas Antioksidan Likopen Pada Buah Tomat (Lycopercisum esculentum) Terhadap Normalitas dan Abnormalitas Spermatozoa Sapi Bali dengan Metode Swim up.

This research is a type of experimental research carried out in a laboratory with the aim of knowing a symptom or effect that arises as a result of certain treatments. The research was conducted at the Immunobiology Laboratory, Faculty of Mathematics and Natural Sciences, Mataram University. The material used in the study was 1 male Bali cow, about 3.5 years old with a cow weight of 460 kg, which the semen was collected using an artificial vagina. The experimental design used in this study was a completely randomized design which was arranged in a factorial design consisting of 3 (three) factors. The first factor is the difference in layer (L) which consists of 2 (two) levels, namely the Upper Layer (LA) and the Lower Layer (LB). The second factor is the concentration of tomato lycopene (P) consisting of 5 (five) levels, namely: 0% (P0), 5% (P1), 10% (P2), 15% (P3) and 20% (P4). The third factor is storage time (H) which consists of 6 (six factors), namely 1 day (H1), 2 days (H2), 3 days (H3), 4 days (H4), 5 days (H5) and 6 days. (H6). The three factors combined to produce 60 treatment combinations, each treatment combination was repeated 6 (six) times so that there were 360 experimental units. The results of the analysis of variance showed that the addition of the tomato fruit lycopene antioxidant and the separation by the swim up method had no significant effect (P> 0.05) on the normality and abnormality of spermatozoa. The addition of tomato fruit lycopene antioxidants and the separation using the swim up method did not have an effect on increasing spermatozoa abnormalities, but did not have a negative effect on the spermatozoa of bali cattle.Keywords: antioxidant, tomato fruit, spermatozoa, bali cow

Periodisitas Tanaman Pekarangan Sebagai Database dalam Pengembangan Wisata Berbasis Konservasi Lingkungan di Desa Sajang, Kecamatan Sembalun, Lombok Timur

The purpose of this study was to determine the periodicity of fruit and vegetable and ornamental plants which can be used as a database in environmental conservation-based tourism development (agro-tourism) in Sajang Village. The periodicity of natural resource utilization aims to determine the rhythm of plant growth, which is indicated by the presence of fruit and flowers as a sign of plants in their reproductive period (Zakiah et al., 2014). The utilization periodicity is carried out by interviewing the owner of the yard to find out the harvest cycle of the yard plants. This research is a descriptive exploratory research. The observations were made deliberately on 105 yards. Based on the research, the data were analyzed qualitatively, presented in the form of diagrams and descriptions and the results obtained were fruit and vegetable plants in Sajang Village of 52% or 46 types of fruiting plants once a year, 35 types or 39% of the plants bearing fruit once every three months, 6% of crops or five types of crops bear fruit every four months and 5% or a total of four crops harvest and bear fruit every two years. Ornamental plants generally flower during the rainy season, namely in November-May as many as 97 types of plants or 71%, and as many as 29% or 40 types of plants there are ornamental plants that flower throughout the year.Keywords: periodicity, agro-tourism, home plants

Pengaruh Pemberian Ekstrak Jahe Merah (Zingiber Officinale R.) Terhadap Susut Masak Dan Nilai pH Pada Daging Ayam Ras Petelur Afkir dengan Konsentrasi dan Lama Perendaman yang Berbeda

This study aims to determine the effect of red ginger extract (Zingiber Officinale R) on the pH value and cooking losses. The study was conducted in January 2018 at the Laboratory of Animal Product Processing Technology, Faculty of Agriculture and Animal Husbandry using a factorial Completely Randomized Design (RAL), where factor A (level of red ginger extract and papaya fruit skin) 0%, 25%, 50%, 75% were interacted with a factor B (soaking time) of 5 minutes, 10 minutes and 15 minutes which was repeated three times. The results showed no significant effect (P> 0.05) on the value of cooking losses. The treatment of using red ginger extract (Zingiber Officinale R) as a natural enzyme that had no significant effect (P> 0.05) on the pH value. In factor A (extract level) to the pH value, this can be seen from the average effect of A is J0 = 6.24%, J1 = 6.28%, J2 = 6.26% and J3 = 6.40%. In factor B (duration of immersion) does not affect the pH value that can be seen from the average effect of B is W1 = 6.14, W2 = 6.41 and W3 = 6.34. The conclusion of this study was that the administration of red ginger extract in cooking losses could decrease in the treatment of P3 = 30.46% and the pH did not significantly affect the immersion long red ginger extract.Keywords: Red Ginger Extract, Natural Enzymes, pH Value and Shrinkage of Cook.

Perbandingan Total Mikroba Kombucha dengan Variasi Jenis Teh dan Lama Fermentasi

Kombucha is a fermented beverage made from tea and sugar. This fermentation is a work of bacteria and yeast consorsia that make a powerful symbiosis cooperation resulting kombucha with quality chemically increased. This kombucha is a healthful beverage for its consumer. Fermentation process can change the tea phisically, such as its taste, colour and flavor. During the fermentation period, the total cell of bacteria and yeast also change. In this research, kombucha is made from 4 different tea, such as black tea, green tea, oolong tea and white tea. As a result, found that the tea as a substrate and also the fermentation period affect the total of colony and cell of bacteria and yeast. In white tea and black tea kombucha perform decreased of total cell bacteria and yeast by the fermentation period, while in green tea and oolong tea kombucha increased. Keywords. kombucha, fermentation, total microbes, SCOBY, haemacytometer

Jamur Makro Ascomycota di TWA Suranadi Lombok Barat

Fungal species from the Ascomycota have a very important role, especially in their function as decomposers in the forest ecosystem. This study aims to identify the Ascomycota macrofungi found in TWA Suranadi. This is a descriptive exploratory study using the cruise method. Identification is done by matching the morphological characters with reference books and various scientific journals on macrofungi. Based on the results of the study, 3 species from Xylaria sp.1, Xylaria sp. 2 and Peziza sp.Keywords. fungi, Ascomycota, TWA Suranadi