Acute fluoxetine differently affects aggressive display in zebrafish phenotypes.

Zebrafish have been introduced as a model organism in behavioral neuroscience and biological psychiatry, increasing the breadth of findings using fish to study the neurobiology of aggression. Phenotypic differences between leopard and longfin zebrafish were exploited in order to elucidate the role of phasic serotonin in aggressive displays on this species. The present study, revealed differences in aggressive display between leopard and longfin zebrafish, and a discrepant effect of acute fluoxetine in both populations. In mirror-induced aggression, leopard animals showed higher display latencies than longfin, as well as lower display duration and frequency (Experiment 1). Moreover, 2.5 mg/kg fluoxetine decreased the duration and frequency of display in longfin, but not leopard; and 5 mg/kg fluoxetine increased display frequency in leopard, but not longfin (Experiment 2). It is suggested that zebrafish from the longfin phenotype show more aggressive motivation and readiness in the mirror-induced aggression test than leopard, and that acute fluoxetine increases aggression in leopard and decreased it in longfin zebrafish.

Synthesis, Characterization and Biological Activities of Biopolymeric Schiff Bases Prepared with Chitosan and Salicylaldehydes and Their Pd(II) and Pt(II) Complexes.

In an attempt to enhance chitosan biological activities, biopolymeric Schiff bases of chitosan and different salicylaldehydes and their palladium(II) and platinum(II) complexes were synthesized and tested. The chemical structures of these derivatives were characterized using ¹H-NMR, FTIR spectroscopy and XPRD. Thermal analysis was done through TGA/DTG-DTA. Electronic absorption spectra and surface morphologies were analyzed by SEM-EDAX. Chitosan and its derivatives were evaluated for their in vitro antimicrobial activity against two common bacterial and fungal plant pathogens Pseudomonas syringae pv. tomato and Fusarium graminearum, respectively, and for their antitumor activity against a human breast cancer cell line (MCF-7). It was found that, compared to the nonmodified chitosan, chitosan modified with Schiff bases and their complexes was highly toxic against the MCF-7 cell line and had antibacterial effects against P. syringea. However, the modified chitosan derivatives had less pronounced antifungal effects against F. graminearum compared to the nonmodified chitosan, suggesting different modes of action.

Does a training course on early childhood communication have an impact on the knowledge of early childhood education professionals? / Um curso de capacitação sobre comunicação na primeira infância impacta no conhecimento de profissionais da educação infantil?

PURPOSE: To analyze whether a training course on communication development in early childhood has a positive impact on the knowledge of early childhood education professionals and to verify the participants' perception of the course. METHODS: A longitudinal study conducted in a virtual environment between September 2021 and December 2022. A total of 91 early childhood education professionals took part and completed a training course. The course consisted of three modules on communication development in early childhood, offered through the Google Classroom platform, with a total workload of 50 hours spread over four months. Participants answered a questionnaire made up of 20 items related to the topics covered before starting the course, immediately after completing it and six months after finishing. For each question answered correctly, 1 point was awarded. The data was analyzed using a descriptive and inferential approach, and the total number of correct answers at the three moments was compared using Friedman's ANOVA, with a significance level of 5%. RESULTS: Both the analysis of the correct answers to each item in the questionnaire and the overall score showed a gradual increase between the three moments. The participants' perception of the course was highly satisfied. CONCLUSION: The participants showed an increase in the number of correct answers to the questionnaire before and after the training course, which suggests greater knowledge about the development of communication in early childhood both immediately after the course and after six months.

OBJETIVO: Analisar se um curso de capacitação sobre o desenvolvimento da comunicação na primeira infância tem impacto positivo no conhecimento de profissionais da educação infantil e verificar a percepção dos participantes sobre o curso. MÉTODO: Estudo longitudinal conduzido em ambiente virtual entre setembro de 2021 e dezembro de 2022. No total, participaram 91 profissionais da educação infantil que concluíram um curso de capacitação. O curso consistiu em três módulos sobre desenvolvimento da comunicação na primeira infância, ofertados por meio da plataforma Google Classroom, com uma carga horária total de 50 horas distribuídas ao longo de quatro meses. Os participantes responderam um questionário composto por 20 itens relacionados aos temas abordados antes de iniciar o curso, imediatamente após a conclusão e seis meses após o término. Para cada questão respondida corretamente foi atribuído 1 ponto. A análise dos dados foi conduzida por meio de uma abordagem descritiva e inferencial, sendo a comparação do total de acertos nos três momentos realizada por meio da ANOVA de Friedman, com nível de significância de 5%. RESULTADOS: Tanto a análise dos acertos de cada item do questionário, quanto a pontuação geral revelou aumento gradual entre os três momentos. A percepção dos participantes sobre o curso teve alto índice de satisfação. CONCLUSÃO: Os participantes demonstraram aumento no número de acertos no questionário nos momentos pré e pós curso de capacitação, o que sugere maior conhecimento sobre o desenvolvimento da comunicação na primeira infância tanto imediatamente após sua conclusão, quanto após seis meses.

Synthesis and evaluation of diethylethylamine-chitosan for gene delivery: composition effects on the in vitro transfection efficiency.

Chitosan has been indicated as a safe and promising polycation vector for gene delivery. However its low transfection efficiency has been a challenging obstacle for its application. To address this limitation, we synthesized chitosan derivatives which had increasing amounts of diethylethylamine groups (DEAE) attached to the chitosan main chain. The plasmid DNA VR1412 (pDNA), encoding the ß-galactosidase (ß-gal) reporter gene was used to prepare nanoparticles with the chitosan derivatives, and the transfection studies were performed with HeLa cells. By means of dynamic light scattering and zeta potential measurements, it was shown that diethylethylamine-chitosan derivatives (DEAE(x)-CH) were able to condense DNA into small particles having a surface charge depending on the polymer/DNA ratio (N/P ratio). Nanoparticles prepared with derivatives containing 15 and 25% of DEAE groups (DEAE(15)-CH and DEAE(25)-CH) exhibited transfection efficiencies ten times higher than that observed with deacetylated chitosan (CH). For derivatives with higher degrees of substitution (DS), transfection efficiency decreased. The most effective carriers showed low cytotoxicity and good transfection activities at low charge ratios (N/P). Vectors with low DS were easily degraded in the presence of lysozyme at physiological conditions in vitro and the nontoxicity displayed by these vectors opens up new opportunities in the design of DEAE-chitosan-based nanoparticles for gene delivery.

Hybrid lipid-biopolymer nanocarrier as a strategy for GBM photodynamic therapy (PDT).

Glioblastoma (GBM) is the most common brain cancer characterized by aggressive and infiltrated tumors. For this, hybrid biopolymer-lipid nanoparticles coated with biopolymers such as chitosan and lipidic nanocarriers (LN) loaded with a photosensitizer (AlClPc) can be used for GBM photodynamic therapy. The chitosan-coated LN exhibited stable physicochemical characteristics and presented as an excellent lipid nanocarrier with highly efficiently encapsulated photosensitizer chloro-aluminum phthalocyanine (AlClPc). LN(AlClPc)Ct0.1% in the presence of light produced more reactive oxygen species and reduced brain tumor cell viability and proliferation. Confirm the effects of in vivo LN applications with photodynamic therapy confirmed that the total brain tumor area decreased without systemic toxicity in mice. These results suggest a promising strategy for future clinical applications to improve brain cancer treatment.

New series of metal complexes by amphiphilic biopolymeric Schiff bases from modified chitosans: Preparation, characterization and effect of molecular weight on its biological applications.

To improve biological activity of chitosans, new Zn(II), Pd(II) and Pt(II) complexes with biopolymeric amphiphilic Schiff bases anchored in different molecular weight chitosans matrices modified with salicylaldehyde and glycidol were prepared. Salicylaldehyde was introduced to generate complexing Schiff base sites in the chitosans matrix while glycidol is intended to increase the water solubility of the resulting biopolymeric complexes. These novel complexes were characterized using various techniques and assayed for antimicrobial and antitumor activity. The effectiveness of modification was evaluated using FTIR spectroscopy, and thermal behavior of the complexes by TG/DTG-DTA. XPRD showed that the crystallinity of the ligand diminished after the metal complexation. Surface morphologies, investigated by SEM, revealed that the complexes are rougher than chitosan matrix, and the presence of metallic ions was confirmed by EDX. Electronic spectra suggested square planar geometry for Pd(II) and Pt(II) complexes. Concerning antimicrobial activity, the novel complexes exhibited higher antibacterial efficiency against Pseudomonas syringae than against the Fusarium graminearum fungi regarding the free ligand. Complexes also exhibited high antitumor effects against the MCF-7 breast cancer cells, with certain selectivity regarding non-tumor cells (Balb/C 3T3 clone A31) depending on concentration and molar mass, indicating that they could potentially be used for antitumor applications.

The influence of reaction parameters on complexation of Zn(II) complexes with biopolymeric Schiff bases prepared from chitosan and salicylaldehyde.

Influence of some reactional parameters as mol ratio (Schiff base:metal), solvent, temperature and reaction time were evaluated in order to improve the extension of complexation during the preparation of zinc complexes of biopolymeric Schiff base from chitosan and salicylaldehyde. Zinc(II) complex was used as a model system in order to improve the degree of complexation for further synthesis of different Schiff bases complexes from other aldehydes and metallic centers. The complexation yields for each synthesis were estimated on the basis of the zinc oxide formed after thermal degradation. Thus thermogravimetry was used to determine the experimental percentage of metal that interact with the free biopolymeric Schiff base. In conclusion, complexation reaction of zinc(II) with biopolymeric Schiff bases was more effective at 40 °C in ethanol as a solvent with intermediary dielectric constant, which resulted in higher metallic contents. Other experimental conditions that resulted in highest degree of complexation were mol ratio 1.0:1.0 (mol/mol, Schiff base:metal), reaction temperature 40 °C and reaction time of 8 h in ethanol. Biological activity of free ligand and its Zn(II) complex obtained under optimized conditions were evaluated against tumor cells.

Um curso de capacitação sobre comunicação na primeira infância impacta no conhecimento de profissionais da educação infantil? / Does a training course on early childhood communication have an impact on the knowledge of early childhood education professionals?

Resumo Objetivo Analisar se um curso de capacitação sobre o desenvolvimento da comunicação na primeira infância tem impacto positivo no conhecimento de profissionais da educação infantil e verificar a percepção dos participantes sobre o curso. Método Estudo longitudinal conduzido em ambiente virtual entre setembro de 2021 e dezembro de 2022. No total, participaram 91 profissionais da educação infantil que concluíram um curso de capacitação. O curso consistiu em três módulos sobre desenvolvimento da comunicação na primeira infância, ofertados por meio da plataforma Google Classroom, com uma carga horária total de 50 horas distribuídas ao longo de quatro meses. Os participantes responderam um questionário composto por 20 itens relacionados aos temas abordados antes de iniciar o curso, imediatamente após a conclusão e seis meses após o término. Para cada questão respondida corretamente foi atribuído 1 ponto. A análise dos dados foi conduzida por meio de uma abordagem descritiva e inferencial, sendo a comparação do total de acertos nos três momentos realizada por meio da ANOVA de Friedman, com nível de significância de 5%. Resultados Tanto a análise dos acertos de cada item do questionário, quanto a pontuação geral revelou aumento gradual entre os três momentos. A percepção dos participantes sobre o curso teve alto índice de satisfação. Conclusão Os participantes demonstraram aumento no número de acertos no questionário nos momentos pré e pós curso de capacitação, o que sugere maior conhecimento sobre o desenvolvimento da comunicação na primeira infância tanto imediatamente após sua conclusão, quanto após seis meses.

Abstract Purpose To analyze whether a training course on communication development in early childhood has a positive impact on the knowledge of early childhood education professionals and to verify the participants' perception of the course. Methods A longitudinal study conducted in a virtual environment between September 2021 and December 2022. A total of 91 early childhood education professionals took part and completed a training course. The course consisted of three modules on communication development in early childhood, offered through the Google Classroom platform, with a total workload of 50 hours spread over four months. Participants answered a questionnaire made up of 20 items related to the topics covered before starting the course, immediately after completing it and six months after finishing. For each question answered correctly, 1 point was awarded. The data was analyzed using a descriptive and inferential approach, and the total number of correct answers at the three moments was compared using Friedman's ANOVA, with a significance level of 5%. Results Both the analysis of the correct answers to each item in the questionnaire and the overall score showed a gradual increase between the three moments. The participants' perception of the course was highly satisfied. Conclusion The participants showed an increase in the number of correct answers to the questionnaire before and after the training course, which suggests greater knowledge about the development of communication in early childhood both immediately after the course and after six months.

Characterization, solubility and biological activity of amphihilic biopolymeric Schiff bases synthesized using chitosans.

Chitosans are versatile biopolymers recognized for their wide range of biological activities. However, the low solubility in neutral and basic solutions restricts the applications. Thus amphiphilic biopolymeric Schiff bases from chitosans, salicylaldehyde and glycidol were successfully synthesized and characterized using 1H-NMR, UV/Vis, FTIR, TG/DTG-DTA and tested for their antimicrobial activities against plant pathogenic microorganisms and human breast cancer cells (MCF-7). Overall, functionalization of chitosans with salicylaldehyde and glycidol with different molecular weight (Mw¯) was performed to improve the biological actives of chitosans. Thus the biological activity of the new amphiphilic compounds prepared in this work were evaluated regarding microorganisms with agricultural relevance and tumor cells. The biopolymeric amphiphilic Schiff bases showed significant effects against Pseudomonas syringae (IC50 < 5 µg mL-1) compared to the natural chitosans with medium Mw¯ (CHM 223 kDa) and low Mw¯ (CHL 64 kDa), which had IC50 values of 42 and 37 µg mL-1, respectively. In addition, they improved antitumor activity against tumor cells compared to the natural chitosan.

A new look towards the thermal decomposition of chitins and chitosans with different degrees of deacetylation by coupled TG-FTIR.

Chitins and Chitosans with different degrees of deacetylation (DD¯) were analyzed for the first time by thermogravimetry coupled to infrared spectroscopy TG-FTIR in order to evaluate the effect of DD¯ on the thermal decomposition process. DD¯ values of chitins and chitosans were determined by 1H-NMR and structural difference were investigated by FTIR, SEM and XRD. Thermal stability of chitosan with 98, 87, 71% DD¯, chitins with 47 and 27% DD¯ and commercial α-chitin were evaluated. Thermal decomposition of chitosans occurs in two steps, while for chitins occurs predominantly in first stage under air atmosphere. Commercial chitin thermally decomposed at lower temperatures than highly deacetylated chitosan. A faster thermal degradation process was found for chitins, except for commercial sample. TG-FTIR of evolved gas evidenced a complex gaseous mixture mainly composed by ammonia, acetic acid, acetamide, water, monoxide and carbon dioxide in proportions that are deeply dependent on the DD¯.

Synthesis, characterization and biological activity of Cu(II), Ni(II) and Zn(II) complexes of biopolymeric Schiff bases of salicylaldehydes and chitosan.

Schiff bases have been prepared from biopolymer chitosan and salicylaldehyde, 5-methoxysalicylaldehyde, and 5-nitrosalicylaldehyde. Ligands were synthesized in a 1:1.5mol ratio, and their Cu(II), Ni(II) and Zn(II) complexes in a 1:1mol ratio (ligand:metal). Ligands were characterized by 1H NMR and FTIR, resulting in degrees of substitution from 43.7 to 78.7%. Complexes were characterized using FTIR, electronic spectra, XPRD. The compounds were confirmed by the presence of an imine bond stretching in the 1630-1640cm-1 and νMetal-N and νMetal-O at <600cm-1. Electronic spectra revealed that both Cu(II) and Ni(II) complexes present a square plane geometry. The crystallinity values were investigated by X-ray powder diffraction. Thermal behavior of all compounds was evaluated by TGA/DTG and DTA curves with mass losses related to dehydration and decomposition, with characteristic events for ligand and complexes. Schiff base complexes presented lower thermal stability and crystallinity than the starting chitosan. Residues were the metallic oxides as confirmed by XPRD, whose amounts were used in the calculation of the percentage of complexed metal ions. Surface morphologies were analyzed with SEM-EDAX. Preliminary cytotoxicity tests were performed using MTT assay with HeLa cells. Despite the differences in solubility, the free bases presented relatively low toxicity.

Non-mammalian models in behavioral neuroscience: consequences for biological psychiatry.

Current models in biological psychiatry focus on a handful of model species, and the majority of work relies on data generated in rodents. However, in the same sense that a comparative approach to neuroanatomy allows for the identification of patterns of brain organization, the inclusion of other species and an adoption of comparative viewpoints in behavioral neuroscience could also lead to increases in knowledge relevant to biological psychiatry. Specifically, this approach could help to identify conserved features of brain structure and behavior, as well as to understand how variation in gene expression or developmental trajectories relates to variation in brain and behavior pertinent to psychiatric disorders. To achieve this goal, the current focus on mammalian species must be expanded to include other species, including non-mammalian taxa. In this article, we review behavioral neuroscientific experiments in non-mammalian species, including traditional "model organisms" (zebrafish and Drosophila) as well as in other species which can be used as "reference." The application of these domains in biological psychiatry and their translational relevance is considered.

Polymeric systems as nanodevices for siRNA delivery.

The delivery of small interfering RNAs (siRNAs) is a promising approach to silencing gene expression aimed at treating infections, cancer, neurodegenerative diseases and various other disorders. Recent progress in this area has been achieved with nanodevices possessing multiple properties and assembled with new, biodegradable, synthetic polymers and polysaccharides. Different synthetic routes and multiple strategies, such as multilayer systems and stimuliresponsive polymers, have been developed to attain high efficiencies. This review covers the most important, promising and successful approaches to improve siRNA delivery. It is a concise report on multiple strategies employed, including cell-specific delivery coupling ligands or antibodies with nanodevices to improve siRNA efficiency and specificity.