Találati lista | Tudóstér

001-es BibID:	BIBFORM134974
Első szerző:	Aba, Patrick Emeka
Cím:	Hepatic Histomorphological Changes and Oxidative Stress Profile of Clarias gariepinus (Burchell, 1822) Juveniles Fed with Sodium Propanoate-Preserved Diets / Patrick E. Aba, Ifeanyi E. Uzochukwu, Nelson I. Ossai, Ifeanyi G. Eke
Dátum:	2018
ISSN:	2067-3205 2067-3264
Tárgyszavak:	Agrártudományok Állattenyésztési tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Clarias gariepinus C-reactive protein hepatic histomorphometry oxidative stress markers sodium propanoate
Megjelenés:	Notulae Scientia Biologicae. - 10 : 4 (2018), p. 460-465. -
További szerzők:	Uzochukwu, Ifeanyi Emmanuel (1989-) (Environmental Scientist/Animal Scientist) Ossai, Nelson Ike Eke, Gabriel Ifeanyi
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon:

001-es BibID:	BIBFORM134751
Első szerző:	Uzochukwu, Ifeanyi Emmanuel (Environmental Scientist/Animal Scientist)
Cím:	Burbot (Lota lota) as a bioindicator of microplastic pollution in the Tisza River: Multi-tissue contamination, polymer characterisation, and implications for ecological and human-health risks / Ifeanyi Emmanuel Uzochukwu, László Nagy, Dóra Somogyi, Angéla Pásztor, Nelson Ike Ossai, László Antal, Vasela Yancheva, István Csarnovics, Krisztián Nyeste
Dátum:	2026
ISSN:	0304-3894
Megjegyzések:	Microplastic (MP) pollution poses a growing threat to freshwater ecosystems and human health, yet knowledge of its occurrence in European rivers remains limited. This study provides the first evidence of MP contamination in burbot (Lota lota) from the Hungarian upper Tisza River. MPs were detected in all sampled fish (n = 10), with an average of 24.6+-7.46 particles per individual. Most particles were fibres (83.3%), predominantly blue and generally < 500 [mu]m in diameter. A Kruskal-Wallis analysis showed significant differences in MP retention across tissues (p < 0.05), with gills (1.53 MPs g-¹) and the gastrointestinal tract (GIT; 1.54 MPs g-¹) containing higher loads than liver (0.89 MPs g-¹) and muscle (1.07 MPs g-¹). Correlation analysis indicated non-significant positive associations (p>=0.05) between total MP load and retention in the GIT (r = 0.41), liver (r = 0.58), and muscle (r = 0.63), but a negative relationship with gills (r = -0.56). Raman spectroscopy confirmed 68 particles representing 17 polymer and copolymer types, grouped into three categories: anthropogenically modified cellulosic fibres (ACF), textile-derived MPs, and petroleum-derived MPs. Textile-associated materials, including ACF, PET-cotton blends, and indigo-dyed polyurethane, predominated, indicating strong inputs from domestic laundering and urban effluent. Estimated human exposure through burbot consumption ranged from 14.4 MPs/week in infants to 320.54 MPs/week in European adults (123.6 MPs/week in Hungary), highlighting a potential dietary exposure pathway. These findings show that inadequate upstream waste management drives contamination and provide a critical baseline for monitoring microplastic pollution in Central European freshwater systems. Given its ecological traits and tissue-specific retention patterns, burbot represents a valuable bioindicator for long-term riverine MP surveillance.
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Microplastic Pollution Poor waste management Freshwater ecosystems Burbot (Lota lota) Aquatic healthand Environmental monitoring
Megjelenés:	Journal Of Hazardous Materials. - 503 (2026), p. 1-19. -
További szerzők:	Nagy László (2000-) (hidrobiológus) Somogyi Dóra (1996-) (hidrobiológus) Pásztor Angéla Ossai, Nelson Ike Antal László (1984-) (hidrobiológus, biológus-ökológus) Yancheva, Vesela Csarnovics István (1986-) (fizikus) Nyeste Krisztián József (1993-) (hidrobiológus)
Pályázati támogatás:	Bolyai Ösztöndíj MTA TKP2021-NKTA-32 FIKP RRRF 2.3.1-21- 2022-0000 Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon:

001-es BibID:	BIBFORM129425
035-os BibID:	(Scopus)105002302827 (WoS)001471203800001
Első szerző:	Uzochukwu, Ifeanyi Emmanuel (Environmental Scientist/Animal Scientist)
Cím:	Phytochemical profile and growth performance evaluation of African catfish (Clarias gariepinus) fed soursop (Annona muricata) leaf meal / Uzochukwu, Ifeanyi Emmanuel; Ossai, Nelson Ike; Aba, Patrick Emeka; Amaefule, Bright Chigozie; Nwobodo, Elisha Chukwudi; Odo, Joannes Oluchi; Ezeh, Maryann Ogechukwu; Ezeifeka, Onyinye Anthonia; Ogugofor, Martins Obinna; Somogyi, Dóra; Yancheva, Vesela; Nyeste, Krisztián
Dátum:	2025
ISSN:	2468-2276
Megjegyzések:	The potential of Annona muricata leaf meal (SLM) as a feed additive for African catfish (Clarias gariepinus) was investigated through a 56-day feeding trial. The study began with a quantitative phytochemical analysis of SLM, followed by Gas Chromatography-Mass Spectrometry (GC?MS) of methanolic leaf extracts. 180 juveniles, averaging 151.12 ? 8.54 g, were randomly assigned to four groups, each with 45 fish and three replicates in a Completely Randomized Design. The groups?Control, T1, T2, and T3 were fed diets containing 0 %, 2.5 %, 5 %, and 7.5 % SLM, respectively. Phytochemical analysis revealed substantial amounts of phenols, flavonoids, alkaloids, and saponins. GC?MS identified 13 distinct compounds, including fatty acids, fatty acid esters, ethers and aldehydes. Fish were weighed at the study's conclusion, and blood samples were collected for hematological and serum lipid profile analysis. Condition factors and survivability were similar across all groups (p ? 0.05). However, final body weight (FW), weight gain, specific growth rate, total feed intake (TFI), and feed conversion ratio varied significantly (p < 0.05). The control group exhibited the highest FW (339.20 ? 3.16 g) and TFI (597.05 ? 6.65 g), with results comparable to T1. Conversely, TFI and growth progressively declined with increasing SLM levels, with T3 showing the lowest FW (299.62 ? 7.83 g) and TFI (541.06 ? 20.39 g). Hematological and serum profile indices were similar across groups (p ? 0.05). These findings highlight the nutritional and ethnopharmacological relevance of A. muricata leaves. It was, therefore, concluded that SLM can be included in catfish diets at 2.5 % without negatively affecting growth or health.
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Clariid catfish Graviola leaf Aquaculture nutrition Bioactive compounds Ethnomedicine Sustainable fish farming Fish health
Megjelenés:	Scientific African. - 28 (2025), p. 1-15. -
További szerzők:	Ossai, Nelson Ike Aba, Patrick Emeka Amaefule, Bright Chigozie Nwobodo, Elisha Chukwudi Odo, Joannes Oluchi Ezeh, Maryann Ogechukwu Ezeifeka, Onyinye Anthonia Ogugofor, Martins Obinna Somogyi Dóra (1996-) (hidrobiológus) Yancheva, Vesela Nyeste Krisztián József (1993-) (hidrobiológus)
Pályázati támogatás:	TKP2021-NKTA-32 Egyéb RRRF 2.3.1-21- 2022-0000 Egyéb GINOP_PLUSZ-2.1.1-21-2022-00245 Egyéb N? BG-RRP-2.004-0001-C01, DUECOS Egyéb Bolyai Ösztöndíj Egyéb EKOP-24-4-II Egyéb EKOP-24-4-I Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon:

001-es BibID:	BIBFORM115941
035-os BibID:	(Scopus)85175563279 (WoS)001108983900001
Első szerző:	Uzochukwu, Ifeanyi Emmanuel (Environmental Scientist/Animal Scientist)
Cím:	Optimizing feed utilization and reducing deterioration of African catfish feed with sodium propionate supplementation / Ifeanyi Emmanuel Uzochukwu, Patrick Emeka Aba, Nelson Ike Ossai, Hillary Chukwuemeka Ugwuoke, Krisztián Nyeste, Ndubuisi Samuel Machebe
Dátum:	2023
ISSN:	2352-5134
Megjegyzések:	A 56-day, two-phased experiment was conducted to investigate the effect of sodium propionate (NaP) on the growth performance of African catfish and the feed quality. One hundred juveniles with an average body weight of 50.47 g ( ? 4.60) were procured and used for the study's first phase. Fish were randomly assigned to five groups (A, control group), B, C, D, and E) and replicated four times with five fish each. Respective groups were fed diets containing NaP at 0, 1.67, 3.33, 5.00, and 6.67 g kg 1 feed, respectively. For the second trial, the individual diets were analyzed for quality characteristics on 0-, 28- and 56-days of storage, using a mixed-model analysis of variance. Results showed significant differences in most growth performance parameters among groups except for the final body length and condition factor. Group C had lower final body weight (FW), weight gain (WG), average feed intake (AFI), specific growth rate (SGR), and higher feed conversion ratio (FCR) than the control. However, these parameters did not differ in Group D, which also showed lower AFI compared to the control. Increasing NaP decreased the sensory attribute scores of the feed and its crude protein (CP), ether, and ash levels while increasing moldiness, crude fiber, nitrogen-free extract, and thiobarbituric acid reactive substances (TBARs). NaP inclusion in feed resulted in a dose-dependent reduction in the feed deterioration, as seen in the lowered aggregate changes in sensory attributes, CP, moisture, and ash levels, with Group D having an optimal effect. The TBARs level (rancidity) decreased in Group B but increased in Group E during the study. The study concludes that there was a loss of fish feed quality with increasing storage time and that NaP particularly at 5.0 g kg 1 feed optimally improves feed utilization and effectively lowers feed deterioration for 56 days. Therefore, the use of NaP is recommended for improved aquaculture production.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Sodium propionate African catfish Growth performance Feed quality Feed deterioration Aquaculture production
Megjelenés:	Aquaculture Reports. - 33 (2023), p. 1-13. -
További szerzők:	Aba, Patrick Emeka Ossai, Nelson Ike Ugwuoke, Hillary Chukwuemeka Nyeste Krisztián József (1993-) (hidrobiológus) Machebe, Ndubuisi Samuel
Pályázati támogatás:	ÚNKP-22-4-II-DE Egyéb TKP2021-NKTA-32 Egyéb RRF 2.3.1-21-2022-00008 Egyéb GINOP_PLUSZ-2.1.1-21-2022-00245 GINOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: