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Alencar Janderson Batista Rodrigues,Bento Matheus,Yoshida Takahiro,da Fonseca Claudio Ruy Vasconcelos,Beggiato Baccaro Fabrício 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.2
Desjardin’s flat bark beetle – Cryptamorpha desjardinsii (Guérin-Méneville, 1844) – is a widespread invasive species that can become a stored products pest and threaten native species. Our objectives were to provide the first detailed records of this species to South America and New Caledonia, and model suitable areas of C. desjardinsii globally based on different Ecological Niche Models (ENM). We combine several techniques to predict the ecological niche of C. desjardinsii using distribution records and a set of environmental predictor variables. Overall, the species appears to be well established in tropical and subtropical regions, particularly in islands, with new and previous records predicted by the consensus model. In South America, the driest and coldest regions were predicted to be less suitable for the occurrence of C. desjardinsii. In the current global spread context, these findings are pivotal to predicting areas of high risk of invasion of C. desjardinsii.
Alencar, R. S.,Aguiar, A. L.,Paschoal, A. R.,Freire, P. T. C.,Kim, Y. A.,Muramatsu, H.,Endo, M.,Terrones, H.,Terrones, M.,San-Miguel, A.,Dresselhaus, M. S.,Souza Filho, A. G. American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.15
<P>The dependence of the radial breathing modes (RBMs) and the tangential mode (G-band) of triple-wall carbon nanotubes (TWCNTs) under hydrostatic pressure is reported. Pressure screening effects are observed for the innermost tubes of TWCNTs similar to what has been already found for DWCNTs. However, using the RBM pressure coefficients in conjunction with the histogram of the diameter distribution, we were able to separate the RBM Raman contribution related to the intermediate tubes of TWCNTs from that related to the inner tubes of DWCNTs. By combining Raman spectroscopy and high-pressure measurements, it was possible to identify these two categories of inner tubes even if the two tubes exhibit the same diameters because their pressure response is different. Furthermore, it was possible to observe similar RBM profiles for the innermost tubes of TWCNTs using different resonance laser energies but also under different pressure conditions. This is attributed to changes in the electronic transition energies caused by small pressure-induced deformations. By using Raman spectroscopy, it was possible to estimate the displacement of the optical energy levels with pressure.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-15/jp4126045/production/images/medium/jp-2013-126045_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp4126045'>ACS Electronic Supporting Info</A></P>
Taliana Kenia Alencar Bezerra,Jose´ Thalles Jocelino Gomes de Lacerda,Bruno Ramos Salu,Maria Luiza Vilela Oliva,Maria Aparecida Juliano,Maria Teresa Bertoldo Pacheco,Marta Suely Madruga 한국식품영양과학회 2019 Journal of medicinal food Vol.22 No.12
Peptides from protein hydrolysate of a mixture of chicken combs and wattles (CCWs) were obtained through enzymatic hydrolysis, and their anticoagulant and inhibitory effects on angiotensin I-converting enzyme (ACE) were investigated. The protein hydrolysate exhibited anticoagulant capacity by the intrinsic pathway (activated partial thromboplastin time) and potent ACE-inhibitory activity. The peptides were sequenced by LC-MS to identify those with higher inhibitory potential. From the pool of sequenced peptides, the following three peptides were selected and synthesized based on their low molecular weight and the presence of amino acids with ACE-inhibitory potential at the C-terminus: peptide I (APGLPGPR), peptide II (Piro-GPPGPT), and peptide III (FPGPPGP). Peptide III (FPGPPGP) showed the highest ACE-inhibitory capacity among the peptides selected. In conclusion, a peptide (FPGPPGP) of unknown sequence was identified as having potent ACE-inhibitory capacity. This peptide originated from unconventional hydrolysates from poultry slaughter waste, including combs and wattles.
Oxidative stress mediated cytogenotoxicological effects of phytol in wistar albino rats
Marcus Vinícius Oliveira Barros de Alencar,Muhammad Torequl Islam,Antonielly Campinho dos Reis,Santos José Victor de Oliveira,Adriana Maria Viana Nunes,Felipe Cavalcante Carneiro da Silva,Machado Keyl 경희대학교 융합한의과학연구소 2023 Oriental Pharmacy and Experimental Medicine Vol.23 No.1
Phytol (PHY), a diterpenoid, is known for its various bio-pharmacological activities. However, its toxicological profile has yet to be evaluated. The aim of this study was to evaluate the cytogenotoxicological profile of PHY in Wistar albino rats. Forty-five female non-pregnant rats were treated acutely and subchronically with PHY at doses of 300 and 2000 mg/kg and 30, 60 and 90 mg/kg for 14 and 28 days. Neuropharmacological, genotoxic, and mutagenic effects were investigated. The results suggest that PHY did not cause the death of rats at a dose of 2000 mg/kg, suggesting a higher range of the LD50 of this diterpenoid. Several toxicological alterations were observed in clinical and neuropharmacological parameters depending upon the doses. No hepatic histopathological changes were observed. PHY induced genotoxicity in peripheral blood, bone marrow, liver, and kidney. PHY did not show damage repair activity in peripheral blood lymphocytes. In the bone marrow, both acute and subchronic PHY treatments increased micronucleus frequency, indicating a mutagenic effect. PHY caused neuropharmacological alterations and genetic instability, possibly through the oxidative stress induction pathway.
From high pressure radial collapse to graphene ribbon formation in triple-wall carbon nanotubes
Silva-Santos, S.D.,Alencar, R.S.,Aguiar, A.L.,Kim, Y.A.,Muramatsu, H.,Endo, M.,Blanchard, N.P.,San-Miguel, A.,Souza Filho, A.G. Elsevier 2019 Carbon Vol.141 No.-
<P><B>Abstract</B></P> <P>The radial stability and the irreversible transformation of triple-wall carbon nanotubes (TWCNTs) bundles are investigated at high pressure conditions both experimentally and theoretically (exp. up 72 GPa). The tubes having a mean internal diameter of 0.83 nm and graphite-like intertube distance, show an onset of the radial collapse evidenced by the evolution of optical phonons. The nanotube collapse onset is observed at ∼ 22 GPa completes for the two external tubes at ∼ 29 GPa, however the innermost tube remains stable up to ∼ 37 GPa. Molecular dynamic calculations performed on smaller diameter TWCNTs bundles, as a model system, confirmed the multiple-stage pressure-induced collapse process. An analytical expression for the collapse pressure of carbon nanotubes having an arbitrary number of walls is proposed. Our experiments and modelling show that for pressures beyond ∼ 60 GPa an irreversible structural transformation of TWCNTs takes place. <I>Ex situ</I> transmission electron microscopy characterization on the recovered sample from 72 GPa revealed the mechanical failure of carbon nanotubes which evolve towards ribbon-like structures as corroborated by Raman spectroscopy. Modelling the tubes evolution at high pressure and high temperature showed the formation of new structures ranging from ribbon-like to graphite-like with either different degrees of amorphization or s <SUP> p 3 </SUP> interlinking.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Wound dressing using graphene quantum dots: a proof of concept
Martins Vanessa Gonzalez Ferreira Caminha,Alencar Luciana Magalhaes Rebelo,Souza Pedro Filho Noronha,Lorentino Carolinne Margot Albanez,Frota Heloisa Freire,dos Santos Andre Luis Souza,Gemini-Piperni 한국약제학회 2023 Journal of Pharmaceutical Investigation Vol.53 No.2
Purpose The costs and complexity related to effective wound healing treatment are immense. The number of multifactorial aspects related to the treatment of wounds (inflammation, infection, and many others) implies a complex multi-therapeutic approach involving various procedures, including medication and surgery. Regarding medication, there are only a few options, especially to treat chronic wounds. Recently graphene quantum dots have been applied for their potent antimicrobial properties as well as their significant tissue remodeling properties. In this study, we developed a formulation based on graphene quantum dots in the form of as a dry powder for wound healing. Methods Graphene quantum dots were produced by top-down technique using graphite as matrix, and fully characterized by Raman spectroscopy, atomic force microscopy, and X-ray diffractometry. The dry powder formulation was produced under aseptic conditions and evaluated in vitro and in vivo. Results The results showed that the formulation improved the healing process in both: in vitro and in vivo, with good adherence, healing time and tissue reconstruction. Finally, the results demonstrated that dry powder was very effective against P. aeruginosa, S. epidermidis, C. albicans and C. tropicalis, representing an improvementfor wound healing purposes. Conclusion The data corroborated the use of the dry powder formulation using graphene quantum dots as matrix as wound dressing, expanding the use of graphene quantum in the biomedical field.
Kuguacin: biological activities of triterpenoid from Momordica charantia—a scoping review
Pedro Henrique Sette-de-Souza,Brenda Alencar Araújo Souza,Moan Jéfter Fernandes Costa,Fábio Andrey da Costa Araújo 경희대학교 융합한의과학연구소 2023 Oriental Pharmacy and Experimental Medicine Vol.23 No.1
The Momordica charantia is a vegetable crop used worldwide due to its biological activities. Investigations into the pharmacological activities of the M. charantia revealed that it presented a wide range of properties, including antimicrobial, anti-cancer, anti-diabetic, and anti-obesity. Over the years, the M. charantia compounds have been identified and studied. In this study, we highlighted the Kuguacin, a triterpenoid isolated from any M. charantia parts. Thus, we aimed to synthesize the scientific knowledge about the Kuguacin biological activities and identify gaps in this area. We performed a scoping review using the Preferred Reporting Items for Systematic reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) to design the study’s protocol, with search in PUBMED, EMBASE, SCOPUS, Science Direct, and SciFinder databases. Most of the studies used in vitro methods, and the Kuguacin were isolated from leaves, vines, fruits, and roots. Studies reported the anti-diabetic, anti-cancer, anti-influenza, anti-HIV, and anti-tuberculosis activities of the Kuguacin.