Publications by authors named "Edvaldo Barros"

Article Synopsis
  • - Endometritis is a major factor causing subfertility in mares, and studying the uterine fluid's protein composition can help improve understanding and treatment of the condition.
  • - The research involved analyzing the protein profiles of uterine fluid from healthy mares and those with different types of endometritis, revealing 549 detectable proteins and focusing on 279 common to all groups.
  • - Significant differences were found in protein abundance between healthy mares and those with infections or post-breeding endometritis, leading to insights on potential biomarkers for diagnosis and treatment of the disease.
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Background & Aims: Human milk (HM) is a complete food that meets the nutritional and energy demands of the newborns. It contains numerous bioactive components, including functional proteins. Variations in HM energy and lipid content have already been reported related to the newborn's sex, but differences between protein profiles are still scarce.

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  • The study investigates how changes in bovine seminal plasma proteins affect sperm function and fertility in bulls, using a proteomic approach.
  • Researchers analyzed seminal plasma from Nellore bulls with different sperm abnormalities using liquid chromatography and mass spectrometry, identifying 297 proteins.
  • This research provides valuable insights into the relationship between seminal plasma protein profiles and sperm quality, contributing to our understanding of reproduction in Nellore bulls.
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  • Sexual rest in bulls leads to lower conception rates, shown by high volumes of ejaculate with many dead sperm, although the exact biochemical reasons are not fully understood.
  • A study with six Nellore bulls evaluated their semen through collections, revealing significant differences in sperm quality and biochemical markers between the first and fourth ejaculates.
  • Findings indicated that the first ejaculate had poorer enzyme activity and higher lipid peroxidation, whereas the fourth ejaculate showed better sperm quality due to differences in fatty acid composition and protein abundance.
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Unlabelled: Climate change increases precipitation variability, particularly in savanna environments. We have used integrative strategies to understand the molecular mechanisms of drought tolerance, which will be crucial for developing improved genotypes. The current study compares the molecular and physiological parameters between the drought-tolerant Embrapa 48 and the sensitive BR16 genotypes.

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Scope: Human milk (HM) has a wide range of proteins with biological and nutritional functions, essential for newborns. The roles of proteins and their proteoforms in HM are not fully understood. This study aims to assess, by 2-DE proteomics, the differential proteoforms in HM, present in colostrum (COL), transition (TRA), and mature milk (MAT), aiming to contribute to understanding neonates' protein needs.

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Horses are seasonal polyoestrous animals, and the photoperiod is the main factor modulating their reproductive activity. There is no consensus on the andrological and biochemical factors that influence breeding seasonality. To assess the involvement of climate in reproduction, Mangalarga Marchador stallions were monitored over 1 year regarding semen quality and seminal plasma proteome.

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Embryo development in eggs of the spittlebug Mahanarva spectabilis (Distant) (Hemiptera: Cercopidae) passes through four phases (known as S1 to S4) being stopped at S2 during diapause. Studies about the molecular basis of diapause in spittlebugs are nonexistent. Here, we analyzed proteins from non-diapausing (ND), diapausing (D) and post-diapausing (PD) eggs of the spittlebug M.

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Although the importance of intestinal hydrolases is recognized, there is little information on the intestinal proteome of lepidopterans such as Anticarsia gemmatalis. Thus, we carried out the proteomic analysis of the A. gemmatalis intestine to characterize the proteases by LC/MS.

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This experiment aimed to compare at day seven after ovulation, the protein profile of uterine fluid in cyclic mares with mares infused two days before with Day 13 conceptus fragments. Experimental animals were ten healthy cyclic mares, examined daily to detect ovulation (Day 0) as soon as estrus was confirmed. On day seven, after ovulation, uterine fluid was collected, constituting the Cyclic group (n = 10).

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Given the importance of pastures for feeding cattle, the study of factors that affect their productivity is essential to get plant material of higher nutritional quality. Thus, the study of insect-plant interaction is important for the development of control strategies. Pasture spittlebugs affect forage grasses causing severe damage.

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Lipases are associated with food spoilage and are also used in various biotechnological applications. In this study, we sought to purify, identify, and characterize a lipase from S. liquefaciens isolated from cold raw cow's milk.

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From in vitro and in vivo models, the proliferative and healing potential of an acidic phospholipase A2 (LAPLA2) from venom was investigated. The LAPLA2 proliferative activity was evaluated on fibroblasts and keratinocytes cultured, and the antioxidant and regenerative potential of LAPLA2 was analyzed in a murine model. The animal study consisted of four groups: C (negative control): 0.

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Article Synopsis
  • - The study focused on comparing the uterine fluid proteomic profiles of mares on day 5 post-ovulation, with samples taken from both cyclic (uninseminated) and inseminated mares to understand factors influencing gestation.
  • - Using two-dimensional electrophoresis (2D-PAGE) and mass spectrometry, three specific proteins (ceruloplasmin, serotransferrin, and albumin) were identified, highlighting their roles in iron metabolism and immune recognition during the early stages of embryo development.
  • - Findings suggest that the abundance changes of these proteins may indicate the uterus's preparation for potential embryo implantation, although an alternative view points to these changes as inflammatory reactions linked to past semen exposure.
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Soybean is one of most consumed and produced grains in the world, and Anticarsia gemmatalis is a pest that causes great damage to this crop due to severe defoliation during its larval phase. Plants have mechanisms that lead to the inhibition of proteases in the intestine of these herbivores, hampering their development. Understanding this complex protease inhibitor is important for pest control.

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Quorum sensing is a cell-cell communication mechanism mediated by chemical signals that leads to differential gene expression in response to high population density. Salmonella is unable to synthesize the autoinducer-1 (AI-1), N-acyl homoserine lactone (AHL), but is able to recognize AHLs produced by other microorganisms through SdiA protein. This study aimed to evaluate the fatty acid and protein profiles of Salmonella enterica serovar Enteritidis PT4 578 throughout time of cultivation in the presence of AHL.

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This review is focused on the state-of-art of peptides with inhibitory activity towards angiotensin I-converting enzyme (ACE) - thus, with anti-hypertensive potential - derived from enzymatic hydrolysis of caseins. Firstly, molecular characteristics of caseins relevant to a better understanding of this subject were concisely commented. Next, a brief description of the pathophysiology of hypertension was explained, focusing on the ACE role in regulation of blood pressure in human body.

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Article Synopsis
  • * Venom samples were collected and analyzed using advanced techniques like two-dimensional gel electrophoresis and mass spectrometry, resulting in the identification of 43 distinct proteins.
  • * The identified proteins include traditional venom components, allergens, and bioactive peptides, with a notable presence of allergenic proteins indicating a significant potential for allergic reactions in humans.
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  • * This study aimed to analyze and compare the muscle protein and phosphoprotein profiles of Angus and Nellore cattle by examining samples from animals raised under the same conditions, focusing on key proteins related to muscle contraction and organization.
  • * Findings indicated that specific proteins were more abundant in either breed, with Nellore showing higher levels of certain contractile proteins and phosphorylation patterns, suggesting these differences could contribute to variations in beef quality, including tenderness and intramuscular fat.
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  • The study analyzed the saliva of three triatomine species: Rhodnius prolixus, Triatoma lecticularia, and Panstrongylus herreri, focusing on proteins found in their saliva.
  • Researchers used mass spectrometry and 2-D electrophoresis to create detailed protein spectra and profiles.
  • The data included various protein characteristics such as UniProt codes, molecular weight, isoelectric points, and insights into biological functions and processes of identified proteins.
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Triatomines are hematophagous arthropods that transmit Trypanosoma cruzi and Trypanosoma rangeli. Feeding behavior and pathogen transmission is known to vary between the different species, and this characteristic is directly or indirectly dependent on the bioactive molecules of the saliva that facilitate the vector-host-parasite interaction. Here, we identify, characterize and compare the sialoproteomic (from the Greek sialo: saliva) repertoire of important species of the main triatomine genera in the Americas (Rhodnius prolixus, Triatoma lecticularia and Panstrongylus herreri) to better explain this interaction through two-dimensional electrophoresis and mass spectrometry.

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