Ask about this productRelated genes to: LENEP protein
- Gene:
- LENEP NIH gene
- Name:
- lens epithelial protein
- Previous symbol:
- -
- Synonyms:
- LEP503
- Chromosome:
- 1q21.3
- Locus Type:
- gene with protein product
- Date approved:
- 2001-02-20
- Date modifiied:
- 2016-10-05
Related products to: LENEP protein
Related articles to: LENEP protein
- Understanding seismic attenuation in carbonate rocks is critical for improving reservoir characterization and fluid monitoring during hydrocarbon exploration. This study investigated the behavior of P-wave attenuation (1/ ) during fluid substitution from saltwater to oil in coquina samples from the Morro do Chaves Formation, an analogue of Brazilian pre-salt reservoirs. Laboratory experiments were conducted at an ultrasonic frequency (1.3 MHz) by using the spectral ratio method to quantify attenuation. The complex pore structure of coquina, which includes interparticle, moldic, vuggy, and microfracture porosities, significantly influences wave dissipation mechanisms such as squirt flow and Biot-type relaxations. Four samples with different porosity-permeability relationships were analyzed, and attenuation measurements were correlated with saltwater saturation ( ) under controlled conditions. The results reveal a clear inverse relationship between 1/ and , with empirical models showing strong correlations ( > 0.8). Although the experiments were conducted at high frequencies, the observed trends provide insight into frequency-dependent attenuation and fluid mobility effects relevant to field-scale seismic applications. The lack of comparable studies of carbonate rocks with such heterogeneity reinforces the novelty of this work. These findings contribute to our understanding of attenuation mechanisms in porous carbonates and support the development of predictive models for use in reservoir-scale monitoring. - Source: PubMed
Publication date: 2025/08/19
Fidelis SimonáriaCeia MarcoMisságia RoseaneOliveira LucasSantos Victor - For the first time, a comprehensive evaluation was carried out to assess the presence of banned, restricted, and widely used permitted pesticides in Lepas anatifera, a globally distributed oceanic species. This study aims to shed light on ocean health along Brazil's equatorial margin, a region identified as a priority for future exploration. Additionally, it seeks to contribute to the understanding of the South Atlantic Ocean, a region with limited scientific studies, by evaluating the potential risks associated with the ingestion of these barnacles. Specifically, the study investigates their potential role in cancer development or disruptions to the endocrine system, considering their critical position within the oceanic food web. A total of 60 organic pollutant compounds were analyzed in 1903 individuals distributed in 19 sample groups of L. anatifera using gas chromatography (GC) equipped with both an electron capture detector (ECD) and a nitrogen-phosphorus detector (NPD) (GC-ECD/NPD). The highest total concentration of permitted pesticides in L. anatifera was triazines (Ʃ = 2314.87 ng/g), followed by organophosphorus (Ʃ = 231.86 ng/g) and pyrethroids (Ʃ = 32.45 ng/g). Among banned and restricted substances, organochlorine pesticides (Ʃ = 24.30 ng/g) had the highest concentrations, followed by polybrominated diphenyl ethers (Ʃ = 10.23 ng/g) and polychlorinated biphenyls (Ʃ = 6.01 ng/g). The cancer risk from polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) was considered insignificant or acceptable. L. anatifera is highlighted as an excellent oceanic biomonitor, demonstrating the ability to accumulate various traditional and emerging organic contaminants, necessitating improved waste management policies and monitoring plans. While PCBs and OCPs are well-known for causing severe diseases such as cancer, all the substances analyzed in this study have the potential to disrupt the endocrine and immune systems and impair reproductive functions. Some may even lead to feminization in animals, among other adverse health effects. These findings highlight the urgent need for effective policies and actions to improve the management of solid and liquid waste, alongside comprehensive plans to monitor the environmental fate of these substances and assess their true risks to living organisms. - Source: PubMed
Publication date: 2025/02/26
Lima Antônia D FNascimento Adriana PMoraes Alessandra S BCosta Ana BSantos Rafael PBezerra Luís E AGiarrizzo TommasoMartins Laercio LCavalcante Rivelino M - This work applied the forensic environmental geochemistry assessment to evaluate the tarballs that contaminated the coast of Brazil in late 2022. Accordingly, saturated and aromatic biomarkers were analyzed by gas chromatography and acidic polar compounds by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) of 16 tarball samples from beaches of five Brazilian states. All samples presented waxy characteristics and are from the same source, highlighting the large coast extension affected by this event (∼3,000 km). However, they have distinct sources from the spilled oils stranded on the Brazilian coast in 2019 and early 2022, as they present distinct fingerprints related to the distribution of resistant biomarkers, including the triaromatic steroids, tricyclic and pentacyclic terpanes, and steranes, which mirrors in significantly different diagnostic ratios. Biomarkers indicate their characteristics of mature and marine crude oils (not fuel). Furthermore, all samples presented low weathering levels, indicating their fate as a high-persistence contaminant in the environment. These tarballs likely originated from the washing processes of ship tanks and persisted drifting on the sea until they arrived on the Brazilian coast. - Source: PubMed
Publication date: 2024/11/28
Nascimento Adriana PAzevedo Rufino Neto APereira Marília Gabriela AFranco Danielle M MVaz Boniek GOliveira André H BSantos Jandyson MCavalcante Rivelino MMartins Laercio L - This study employed organic sulfur markers (S-markers) associated with geochemistry parameters to evaluate the paleoenvironment of different depositional settings in 24 samples collected in vertical sections of outcrops of the Candeias and Barreirinha Formations in Recôncavo and Amazon basins, respectively. A total of twenty-one S-markers from benzothiophene (BT), dibenzothiophene (DBT), and benzonaphtothiophenes (BNT) classes were optimized and quantified by gas chromatography-triple quadrupole mass spectrometry (GC-MS/MS). S-markers efficiently evaluated and differentiated the depositional paleoenvironment in the source rocks based on the individual compound, in cross-validation with saturated biomarkers, and associated with parameters such as total organic carbon (TOC) and Rock-Eval pyrolysis. Samples from the lacustrine environment presented low concentrations of BT, DBT, and BNT, and samples from the marine environment showed high BT, DBT, and BNT concentrations. The variations in ∑DBT and TOC indicated that the quantity and/or the type of organic matter exert some control over the distribution of DBTs. Although the formations are from different paleoenvironments, the organic matter input was similar, as indicated by high proportions of 1,2-BNT and 2,1-BNT relative to 2,3-BNT, thus characterizing the algal input with a microbial contribution for both sites. The sum of the BNTs was directly related to the amounts of amorphous organic matter (AOM) in the vertical distribution of outcrops. These results are in accordance with the finding that BNTs may originate from the microbial activity. The DBT/Phen vs pristane/phytane (Pr/Ph) relationship attested to differences in the redox conditions of the depositional paleoenvironments of the formations under study. The 4,6-DMDBT/2,4,6-TMDBT and 2,4,6-TMDBT/(2,4,7 + 2,4,8)-TMDBT ratios indicated immaturity for hydrocarbon generation. - Source: PubMed
Publication date: 2024/11/01
Nery do Amaral DiegoMiranda Flávia Lima E Cimade Oliveira Lua Morena LeôncioCerqueira José RobertoRibeiro Hélio Jorge Portugal SeverianoOliveira Olívia Maria CordeiroQueiroz Antônio Fernando de SouzaFerreira Sérgio Luís CostaMachado Maria Elisabete - In the present study, we applied forensic geochemistry to investigate the origin and fate of spilled oils like tarballs stranded at the beaches of Bahia, in northeastern Brazil, in September 2023, based on their fingerprints. Saturated and aromatic compounds were assessed by gas chromatography, and the oceanic surface circulation patterns were deciphered to determine the geographic origin of the spill. Contamination by petroleum represents an enormous threat to the unique, species-rich ecosystems of the study area. The geochemical fingerprint of the oil spilled in 2023 did not correlate with those of previous events, including the one in 2019, the one in early 2022 in Ceará, and an extensive spill across the Brazilian Northeast in late 2022. However, the fingerprint did correlate with crude oils produced by Middle Eastern countries, most likely Kuwait. The oil of the 2023 spill had a carbonate marine origin from early mature source rocks. These findings, together with the moderate weathering of the 2023 tarballs and the ocean circulation patterns at the time of the event, indicate that the oil was discharged close to the shore of Brazil, to the east or southeast of Salvador, by a tanker on an international route in the South Atlantic. - Source: PubMed
Publication date: 2024/05/13
Martins Laercio LPereira Vinícius BNascimento Adriana PAzevedo Rufino Neto AOliveira André H BTeixeira Carlos Eduardo PAzevedo Débora Ada Cruz Georgiana FCavalcante Rivelino MGiarrizzo Tommaso