https://tapchikhcnnd.com.vn/index.php/jtse <p>Journal of Tropical Science and Engineering is a multidisciplinary journal (chemistry and materials, biology and biomedicine) published since 2012 under the License of Press Operation No.1479/GP-BTTTT issued on August 20th, 2012 by the Minister of Information and Communications and International Standard Code ISSN 0866-7535 issued by the National Agency for Science and Technology Information, Ministry of Science and Technology.</p> TROPICAL SCIENCE AND TECHNOLOGY JOURNAL en-US Journal of Tropical Science and Engineering 0866-7535 https://tapchikhcnnd.com.vn/index.php/jtse/article/view/188 This study presents the results of some hematological characteristics of the red drum (Sciaenops ocellatus) reared in freshwater tanks and fed a diet consisting of trash fish. Blood samples were collected, cell counts performed, and blood smears, as well as biochemical indices, were analyzed on days 1, 5, 10, and 20 of the experiment. Standard hematological research methods were employed. The water concentrations of several heavy metals were also assessed. The results indicate that red drum showed limited adaptation to the freshwater environment and a natural trash fish diet, with a mortality rate reaching 28% during the 28-day experimental period. The red blood cell count increased by 48% to 81% on day 10 compared to days 1 and 5. Morphological abnormalities in red blood cell membranes were observed in blood samples on day 20. Most biochemical indices remained relatively stable throughout the experiment, except for creatinine, which decreased on days 10 and 20 compared to days 1 and 5. The data obtained also contribute to the reference ranges in the hematological profile of red drum. Huu Quyet Do Tan Dung Pham Thi Mai Huong Nguyen Phi Vuong Tuong Copyright (c) 2025 Journal of Tropical Science and Engineering 2025-05-08 2025-05-08 37 3 20 10.58334/vrtc.jtst.n37.01 https://tapchikhcnnd.com.vn/index.php/jtse/article/view/190 Mangroves consist of various tropical trees or woody shrubs like plants growing at the interface between sea and land zones and form an ecologically important ecosystem. Bruguiera hainesii C. G. Rogers belonging to the family (Rhizophoraceae) is a true mangrove tree. This species was discovered in the Dam Quoc area, Hon Ba islands, Con Dao National Park, Ba Ria-Vung Tau Province. However, studies on the genetic diversity of B. hainesii are limited. Hence, this study was initiated to develop chloroplast microsatellite (cpSSR) markers and applied them to evaluate the genetic diversity of B. hainesii. A total of 133 cpSSRs markers were identified from the chloroplast genome of B. hainesii. Among all cpSSR loci, mononucleotide markers were the most abundant (91%), followed by dinucleotide (8.3%), and trinucleotide (0.7%). In total, 9 newly developed cpSSR markers with polymorphism and good stability were selected for genetic diversity analyses of 7 B. hainesii samples. These cpSSRs amplified a total of 21 alleles. We report low levels of genetic diversity of B. hainesii with Na = 2.3, Ne = 1.42, I = 0.42, Ho = 0.25, and He = 0.27. Our study not only provided a batch of efficient genetic markers for research on B. hainesii but also laid an important foundation for the breeding and conservation of B. hainesii. Thi Thu Trang Hoang Van Dien Pham Mai Phuong Pham Ngoc Huyen Dang Xuan Dac Le Dinh Duy Vu Copyright (c) 2025 2025-05-08 2025-05-08 37 21 34 10.58334/vrtc.jtst.n37.02 https://tapchikhcnnd.com.vn/index.php/jtse/article/view/191 Genus Clenchiella including six species, is mainly distributed in mangrove swamps or estuarine areas. To date, only Clenchiella minutissima (Wattebled, 1884) has been recorded in Vietnam water. Our paper is the first report Clenchiella victoriae Abbott, 1948 from Vietnam based on 12 specimens collected in Phu Quoc islands in March 2024. C. victoriae is characterized by having a pronounced keel on the mid-dorsal and mid-ventral shell, penis always located behind the right cephalic tentacle, and contains two distally glandular lobes. Van Tien Tran Van Truong Tran Quang Tuyen Mai Ba Hai Truong Thi Hong Tham Le Tran Hoai Bao Nguyen Nguyen Dinh Cu Copyright (c) 2025 2025-05-08 2025-05-08 37 35 40 10.58334/vrtc.jtst.n37.03 https://tapchikhcnnd.com.vn/index.php/jtse/article/view/192 This work involved the synthesis of magnetized activated carbon (AC) incorporated with manganese ferrite (MFO) nanoparticles (NPs), denoted as MFC and the evaluation of its adsorptive removals of pentachlorophenol (PCP). A simple and low-cost gel combustion method was employed for the preparation. The material characterization confirmed the presence of cubic-like spinel MFO NPs on the ACs, with a size of 11.63 nm. The calculated specific surface area (SBET) obtained from N2 adsorption isotherm was 649.3 m2/g, whereas the saturation magnetisation value was found to be 15.98 emu/g within an applied magnetic field ranging from -10k to 10k Oe. The study on the adsorption of PCP on MFC absorbent demonstrates the highest adsorption efficiency (ADE) of 96.53% for an initial PCP concentration of 10 mg/L at pH 5 after 24 hours of adsorption using an MFC content of 300 mg/L. Ultimately, the adsorption of PCP on MFC conformed to both the Langmuir and Freundlich isotherm models, with a maximum adsorption capacity of 122.25 mg/g, indicating that PCP molecules were effectively adsorbed on both homogeneous and heterogeneous sites of the adsorbent. Bao Hung Le Xuan Truong Nghiem Thi Thu Hang Nguyen Minh Chau Vu Duc Thang Nguyen Thi Nang Nguyen Minh Quang Dang Phuong Anh Cao Ngoc Nhiem Dao Trung Kien Nguyen Copyright (c) 2025 2025-05-08 2025-05-08 37 41 50 10.58334/vrtc.jtst.n37.04