Daphnia magna

This study was conducted to assess the toxicity of the sulfur mustard military chemical to the growth and development of zooplankton Daphnia magna. D. magna is a group of crustaceans which have unique features such as virgin reproduction/ parthenogenesis form in a short time, easy to identify and control toxic substances so they are usually used as a standard model organism for toxicity testing in aquatic environments.

9p viberkshire 09-08-2023 6 3   Download

Recombination rate is an essential parameter for many genetic analyses. Recombination rates are highly variable across species, populations, individuals and different genomic regions.

13p vinarcissa 21-03-2023 3 1   Download

DDT (Dichloro-diphenyl-trichloroethane) and chlordane are the organochlorine pesticides (OCPs) dangerous to human health and easily accumulate in biological tissues, used to control insects in crops, livestock and house protection. This study aimed to evaluate the toxicity of DDT, cis (alpha-chlordane), and trans (gamma-chlordane) on the growth of two crustaceans species Daphnia magna (D. magna) and Moina macrocopa (M. macrocopa) after 24 h and 48 h.

8p vipagani 24-10-2022 7 2   Download

Thifluzamide is a thiazole carboxanilide fungicide used to control a wide range of basidiomycete diseases on maize, potatoes, rice, and other crops. Although this fungicide is found in aquatic environments, there is no information about its acute and chronic toxicity on aquatic invertebrates. In the present study, to investigate acute and chronic toxicity of thifluzamide, daphnids were exposed to 1.25, 1.5, 2, and 2.5 mg/L thifluzamide for 48 h and 21 days, respectively.

6p dolomite36 30-12-2021 7 1   Download

Cyanobacterial blooms often consist of mixtures of microcystin-producing and microcystin-free species, and both can cause unpredictable effects on aquatic organisms. In this work, the subchronic effects of the cyanobacterial crude extracts (CCEs) from microcystin-producing and microcystin-free cyanobacteria with different microcystin concentrations (1, 10, and 50 µgL−1)on Daphnia magna were investigated. The life-history trait responses of D. magna to CCEs were determined based on survival, reproduction, and somatic growth.

10p dolomite36 30-12-2021 9 0   Download

This paper aimed at implementing a treatment system for polluted water with textile dyes, starting with a photocatalytic decomposition process using sunlight as a source of energy and continuing with a bacterial biodegradation process, in order to reach degradation percentages higher than those obtained using only one of the processes mentioned above. When water treatment with the dye in the combined system was over, an acute ecotoxicity test was performed to make sure that toxic metabolites were not produced due to biodegradation.

14p tudichquannguyet 29-11-2021 9 1   Download

Very few well-studied invertebrate model species meet these requirements, being the waterflea Daphnia magna one of them. Here we report a full genome transcription profiling of D. magna during its life-cycle. The study was performed using a new microarray platform designed from the complete set of gene models representing the whole transcribed genome of D. magna.

13p vibeauty 23-10-2021 6 1   Download

Nghiên cứu này được tiến hành nhằm mục đích cung cấp một cách đầy đủ và tổng quan những thông tin về nguồn gốc, sự phát thải, phân bố và những tác động của vi nhựa lên hệ sinh thái và con người, giúp cho các nhà khoa học cùng cơ quan chức năng xác định rõ vấn đề và thử thách cần giải quyết cho bài toán ô nhiễm vi nhựa.

4p viwinter2711 05-10-2021 69 3   Download

The degradation of epigenetic control with age is associated with progressive diseases of ageing, including cancers, immunodeficiency and diabetes. Reduced caloric intake slows the effects of ageing and agerelated disease in vertebrates and invertebrates, a process potentially mediated by the impact of caloric restriction on epigenetic factors such as DNA methylation.

11p visilicon2711 20-08-2021 4 1   Download

This study is aimed to examine whether the presence of non-toxic filamentous cyanobacteria can cause toxic effects on Daphnia magna. Six strains of Oscillatoria perornata were isolated from the Tri An Reservoir and cultured in our laboratory for investigation. The results revealed that all strains were negative with the mcyA moleculer marker.

10p angicungduoc7 09-09-2020 23 1   Download

In this study, the morpho-biological characteristics of the Daphnia magna Straus culture and microalgae of the genera Ankistrodesmus, Botryococcus, Scenedesmus, Chlorococcum and Chlorella were studied. Protein and fat storage of micronutrients was determined. It has also been found that when Daphnia magna cultures are propagated on the basis of micronutrients, their growth rate and biomass production.

10p nguaconbaynhay7 15-08-2020 23 1   Download

Previous studies have shown that the crude ethanol extract and its ethylacetate fraction of the plant Eupatorium fortunei Turcz strongly inhibited the growth of a harmful freshwater cyanobacterium Microcystis aeruginosa. However, the perspective of using these plant extracts as alternative algicides takes into account their potential risks to other species in aquatic ecosystems, including Daphnia magna.

7p abcxyz123_02 03-03-2020 9 0   Download

In this study, we conducted a chronic toxicity assessment of di-2-ethylhexyl phthalate (DEHP) on the life history traits of Daphnia magna across three generations. In the first generation, the neonates (called F0 Daphnia) were raised in a control environment (C, toxin-free medium) or in a medium containing DEHP at three concentrations 5, 50, and 500 µgl-1, abbreviated as P5, P50, and P500, respectively. The offspring from the F0 control (called F1 Daphnia) were raised in toxin-free medium (denoted as C-C).

6p chauchaungayxua2 07-01-2020 38 1   Download

Harmful cyanobacterial blooms have become a global threat to human health and aquatic biota around the world. While the ecotoxicity of cyanobacterial toxins such as microcystins (MCs) has been studied extensively, the toxicity of non-toxin producing cyanobacteria has not been evaluated to the same extent. In this study, five strains of Microcystis wesenbergii were isolated from the Tri An reservoir and cultured under laboratory conditions. Microscopic observation was used for morphological identification. The MCs concentration was measured by highperformance liquid chromatography (HPLC).

6p chauchaungayxua2 07-01-2020 36 1   Download

Anthropogenic activities such as industrial production, mining, agriculture and transportation are among the main causes for the increase of trace metal concentrations in the environment, especially in water bodies. In this study, we evaluated the chronic impacts of lead (Pb) and arsenic (As) on Daphnia magna, a crucial organism to aquatic ecosystems, at several concentrations (0, 5, 25, 50, 150 and 250 µgl-1 of Pb and 0, 5, 25, 50 µgl-1 of As) for 21 days. The organism’s life history traits, including survivorship, maturation, and reproduction, were recorded daily.

6p chauchaungayxua2 07-01-2020 27 0   Download

Chất lượng nước hồ Xuân Hương trên cơ sở một số yếu tố vật lí, hóa học và sinh học được khảo sát vào tháng 4 (đại diện mùa khô) và tháng 7 (đại diện mùa mưa) năm 2013. Bên cạnh đó, độc tính sinh thái của loài vi khuẩn lam Cylindrospermopsis raciborskii phân lập từ hồ Xuân Hương cũng được đánh giá trên cơ sở phơi nhiễm với loài vi giáp xác Daphnia magna. Kết quả khảo sát, nghiên cứu đã cho thấy nước hồ đang bị phú dưỡng hóa và suy giảm nghiêm trọng. Sự ưu thế và bùng phát vi khuẩn lam là dấu hiệu không tốt cho các thủy sinh vật trong hồ. Loài vi khuẩn lam C.

9p ketaucho 20-11-2019 68 3   Download

Nghiên cứu này có mục tiêu đánh giá độc tính của vật liệu nano đồng (Cu) lên sinh trưởng của loài vi giáp xác D. magna. Vật liệu nano đồng (Cu) được chế tạo bằng phương pháp khử hóa học, nồng độ nano đồng được lựa chọn thử nghiệm từ 0 (mẫu đối chứng) đến 5 ppm

7p vitheseus2711 28-10-2019 34 2   Download

Microcystis is a bloom-forming, common cyanobacterium in Dau Tieng reservoir used for public water supply. To assess the presence of potentially microcystin-producing Microcystis, molecular techniques were conducted and acute toxicity bioassays were performed with the microcrustacean Daphnia magna exposed to cyanobacterial crude extracts. Potentially toxigenic of isolated strains was characterized by amplifying mcyD genes and identification of Microcystis was confirmed by 16S rRNA amplification.

8p viathena2711 08-10-2019 12 0   Download

Nghiên cứu này nhằm đánh giá độc tính của thuốc trừ sâu endosulfan lên sinh trưởng của giáp xác D. magna. Thuốc trừ sâu endosulfan là hóa chất bảo vệ thực vật họ clo hữu cơ, một nhóm chất hữu cơ bền, có khả năng gây rối loạn nội tiết, ảnh hưởng đến hệ thần kinh, gây các tác động xấu cho nội tạng và gây nguy hiểm cho con người. Nồng độ endosulfan được lựa chọn trong nghiên cứu này dao động từ 0 (mẫu đối chứng) đến 0,5 µg/l. Sau 48h phơi nhiễm, tỷ lệ chết của D. magna cao nhất đạt 97% ở nồng độ 0,5 µg/l. Giá trị LC50 ghi nhận tại thời điểm 48h là 0,129 µg/l.

5p hanh_tv25 30-03-2019 67 1   Download

Nội dung bài viết trình bày đánh giá hiệu quá xử lý nước thải giết mô dựa vào độc tính tác động trên chỉ thị sinh học Daphnia magna. Mời các bạn tham khảo!

6p quaymax4 05-09-2018 54 2   Download