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Journal of Tropical Life Science : International Journal of Theoretical, Experimental, and Applied Life Sciences
Published by Universitas Brawijaya
ISSN : 20875517     EISSN : 25274376     DOI : -
Core Subject : Agriculture, Social,
Agriculture, Biological Sciences & Forestry Environmental Science
The Journal of Tropical Life Science (JTLS) provides publication of full-length papers, short communication and review articles describing of new finding or theory in living system, cells and molecular level in tropical life science and related areas. The journal publishes articles that report novel findings of wide Tropical Life system phenomenon in the areas of biodiversity, agriculture, fisheries, health, husbandry, forestry and environmental technology. JTLS has 1 volume with 3 issues per year.
Arjuna Subject : -
Articles 15 Documents
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Search results for , issue "Vol. 11 No. 1 (2021)" : 15 Documents clear
Maternal Diet During Pregnancy and COVID-19 Susceptibility of Offspring: The “Thrifty Phenotype Hypothesis” Connection Custer C Deocaris; Malona V Alinsug
Journal of Tropical Life Science Vol. 11 No. 1 (2021)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.11.01.07

Abstract

There is accumulating evidence suggesting that ACE2, the host cell receptor for the spike (S) protein of the SARS-CoV-2, mediates viral entry and infection, is under epigenetic control. Here, we discuss studies suggesting a nutritional strategy for down-regulating ACE2 expression in tissues of offspring through the phenomenon of maternal epigenomic reprogramming mediated by maternal diet. The "thrifty hypothesis" was first proposed by Hales and Barker, which posits that specific genes are programmed based on early-life experience to promote efficient fat deposition and storage in adulthood. Our analysis of the proposed mechanism for "early life programming" in this paper via nutritional modulation of histone acetylation and DNA methylation goes beyond the physiological consequence of boosting the innate cellular resistance to a viral transmission. During the pandemic, where there is still no specific antiviral drug or a widely disseminated vaccine for COVID-19, we hypothesize that an epigenomic nutrition approach may be a practical approach to help mitigate viral transmission offspring.
Effect of alkaline protease produced from fish waste as substrate by Bacillus clausii on destaining of blood stained fabric Saravana kumari P; Reshma R
Journal of Tropical Life Science Vol. 11 No. 1 (2021)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.11.01.08

Abstract

Alkaline protease or peptidases are the largest group of enzymes in biological industry with variety of application in various industries to process of raw material, dehairing, diagnosis, extraction, food production and processing, destaining, etc., where the conditions prevails above neutral pH. Because of the wider applications the demand also increases for alkaline proteases, so required to produce in large scale cost effectively. An alkaline tolerant bacterial strain Bacillus clausii was isolated from fish waste and used for mass production of alkaline protease using fish waste homogenate as media. Preliminary study on optimization of conditions for the mass production carried out. The optimum temperature for protease production ranges between 25oC and 35oC and pH determined as 9. Along with fish waste homogenate, the mass production of extracellular alkaline protease from mobilized and immobilized cells of B. clausii carried out in production media, mixture of production media and fish waste homogenate and nutrient broth as standards. The recorded results showed that the maximum enzyme production obtained immobilized cells in nutrient broth media and followed by fish waste homogenate of 8900 U/ml and 8600 U/ml respectively. Purified enzyme yield was maximum obtained from production media 0.35 g/ml.  Blood stained cloth treated with immobilized enzyme completely removed stain compared to treatment with non-immobilized enzyme and commercially used detergent. So the current study suggests the usage of microbial alkaline protease in house hold detergent to replace usage of chemicals and save the environment from chemical pollutants.
Dehalogenases for pollutant degradation in brief: A mini review sefatullah Zakary; Habeebat Adekilekun Oyewusi; Fahrul Huyop
Journal of Tropical Life Science Vol. 11 No. 1 (2021)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.11.01.03

Abstract

Dehalogenases are microbial enzyme catalysed the cleavage of carbon-halogen bond of halogenated organic compounds. It has potential use in the area of biotechnology such as bioremediation and chemical industry. Halogenated organic compounds can be found in a considerable amount in the environment due to utilization in agriculture and industry, such as pesticides and herbicides. The presence of halogenated compound in the environment have been implicated on the health and natural ecosystem. Microbial dehalogenation is a significant method to tackle this problem. This review intends to briefly describe the microbial dehalogenases in relation to the environment where they are isolated. The basic information about dehalogenases in relation to dehalogenation mechanisms, classification, sources and the transportation of these pollutants into bacterial cytoplasm will be described. We also summarised readily available synthetic halogenated organic compound in the environment.
High Potential of Liquid Smoke from Coconut Shell (Cocos nucifera) for Biological Control of Rice Bug (Leptocorisa oratorius Fabricius) Zulfaidah Penata Gama; Rizky Mulyo Adi Purnama; Dewi Melani
Journal of Tropical Life Science Vol. 11 No. 1 (2021)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.11.01.11

Abstract

Rice bug (Leptocorisa oracorius F) is one of the most dangerous pests for paddy commodities (Oryza sativa) in the world. The use of liquid smoke was popular among local farmers to control rice bug. A coconut shell is the main source for making liquid smoke. This research aims to analyse rice bugs' mortality and antifeedant activity when dipped with coconut shell liquid smoke. The liquid smoke's effectiveness was measured by dipping paddy (5 grams in weight) that is previously soaked with coconut shell liquid for 20 seconds. The liquid smoke was prepared in various concentrations, ranging from 0% as a control; 0.50%; 0.75%; 1%; 1.25% and 1,50%. Observations were made at 24, 48, 72, 96, 120, 144 and 168 hours. Data analysis was performed by one-way ANOVA test, using SPSS program followed by a 0.05 Tukey test to determine the significance of the rice bug pest mortality. The study resulted that the mortality values from low concentrations to high concentrations were 40%, 46.67%, 60%, 70%, and 80% over seven days. The antifeedant percentage of liquid smoke increased from low concentrations to high concentrations respectively were 10.14%, 15.15%, 31.03%, 46.15%, and 68.88% during seven days. The concentration of liquid smoke that has the highest mortality was 1.50%. In conclusion, 1.50% of liquid smoke showed the highest percentage of mortality and antifeedant activity with 80% and 68.88%, respectively. In the future, it is hoped to develop this model for commercial consumption and reduce reliance on chemicals to control rice bugs. The use of pesticides can do more harm than good, especially to the environmental system.
Genomic Analysis of Mesorhizobium loti Strain TONO Reveals Dehalogenases for Bioremediation Sefatullah Zakary; Habeebat Adekilekun Oyewusi; Fahrul Huyop
Journal of Tropical Life Science Vol. 11 No. 1 (2021)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.11.01.09

Abstract

Halogenated compounds are extensively utilized in different industrial applications such as pesticides and herbicides and cause severe environmental problems because of their toxicity and persistence. Degradation of these compounds by the biological method is a significant method to reduce these recalcitrant. Mesorhizobium loti is important for nitrogen fixation in legume roots. Up to now, there is no report to indicate M. loti can produce dehalogenase enzymes. Thus, a total of twenty-five genomes of M. loti strains from the National Center for Biotechnology Information (NCBI) were analyzed. These strains notably carry dehalogenase genes and were further investigated. The relative ratio of haloalkane and haloacid dehalogenase type II or L-type from all twenty-five genomes was 26% and 74%, respectively, suggesting type II dehalogenase is common. Surprisingly, only M. loti strain TONO carries four dehalogenases and therefore it was further characterized. The chromosome of M. loti strain TONO contains four haloacid dehalogenase type II genes namely, dehLt1 (MLTONO_2099), dehLt2 (MLTONO_3660), dehLt3 (MLTONO_4143), and dehLt4 (MLTONO_6945), and their corresponding enzymes were designated as DehLt1, DehLt2, DehLt3, and DehLt4, respectively. The only haloalkane dehalogenase gene (MLTONO_4828) was located upstream of the dehLt3 gene and its amino acid share 88% identity with DmlA of Mesorhizobium japonicum MAFF 303099. The putative haloacid permease gene designated as dehrPt (MLTONO_0284) was located downstream of the dehLt1 and its amino acids show 69% identity with haloacid permease of Rhizobium sp. RC1. The gene encoding helix-turn-helix (HTH) motif family DNA-binding protein regulator and LysR family transcriptional regulator genes were also identified, possibly for regulatory functions. The genomic studies as such, have good potential to be screened for ne

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