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1.
Climacteric ; 23(5): 505-510, 2020 10.
Artículo en Inglés | MEDLINE | ID: mdl-32338067

RESUMEN

Objective: This study aimed to analyze the effects of isoflavones from Glycine max (L.) Merr (soy) used topically as a vaginal gel on the induction of vascularization of the vaginal tissue in postmenopausal women.Study design: A placebo-controlled, randomized, double-blind trial was conducted with 22 postmenopausal women, randomly allocated for treatment with Glycine max (L.) Merr isoflavone 4% vaginal gel daily for 12 weeks or with placebo gel for the same period.Main outcome measure: Vaginal microbiopsies were collected before and after the 12-week treatment. Immunohistochemistry analyses were performed to provide a blood vessel count per field in the vaginal tissue, pre and post intervention.Results: The isoflavone group exhibited a significant increase in blood vessels per field relative to baseline, whereas the placebo group showed no difference compared to baseline. There was a significant difference in the increase of the number of blood vessels between the isoflavone and placebo groups.Conclusion: The results showed that local administration of Glycine max (L.) Merr isoflavone gel promoted a significant improvement in the number of blood vessels in the vaginal tissue of postmenopausal women.


Asunto(s)
Glycine max , Isoflavonas/administración & dosificación , Vagina/irrigación sanguínea , Vagina/patología , Cremas, Espumas y Geles Vaginales/administración & dosificación , Administración Intravaginal , Anciano , Atrofia , Método Doble Ciego , Femenino , Humanos , Persona de Mediana Edad , Posmenopausia , Estudios Prospectivos , Resultado del Tratamiento
2.
Genetica ; 146(6): 505-515, 2018 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-30361962

RESUMEN

We assessed the presence of independent evolving lineages of the trahira, Hoplias malabaricus, one of the few freshwater fish species having wide distribution in the Neotropics which is the region with the highest global diversity of freshwater fish. To achieve that goal, 58 mitochondrial sequences of cytochrome c oxidase subunit I (COI; DNA barcoding) were generated from collected samples and 85 obtained from public databases, which were analyzed in comparison to chromosomal and geological data. The magnitude of genetic diversity found among different sampling sites was greater than 2%. Molecular species delimitation methods indicated the existence of a least four distinct lineages. The recognised cytotypes did not form monophyletic groups, suggesting that the karyotypic macrostructure could be a homoplastic character. The haplotype relationships suggested secondary contacts between the ecoregions of Northern and Northeastern Brazil that were shaped by coastal routes between adjacent watersheds during the Pleistocene epoch and probable exchanges of their ichthyofaunas. Our results indicated that multiple factors have driven the diversification of H. malabaricus, from ancient geological events linked to the reactivation of tectonic faults to more recent occurrences related to eustatic changes in ocean levels. Ultimately, the magnitude of its genetic diversity suggests the necessity of revising its taxonomic status.


Asunto(s)
Characiformes/genética , Evolución Molecular , Filogenia , Animales , Characiformes/clasificación , Código de Barras del ADN Taxonómico , Complejo IV de Transporte de Electrones/genética , Proteínas de Peces/genética , Haplotipos , Cariotipo , Filogeografía
3.
Appl Opt ; 57(16): 4672-4676, 2018 Jun 01.
Artículo en Inglés | MEDLINE | ID: mdl-29877376

RESUMEN

During beer production, the mashing process is fundamental for extraction of the main sugars from the starch. The quantification of these fermentable sugars during the process provides a measure of the alcoholic content of the final beer. Therefore, monitoring of the sugar composition during beer production is very important for obtaining a quality product. This paper demonstrates the potential of white light interferometry (WLI) for monitoring the extraction of sugars in different mashing processes, by observing the refractive index of the mixture. All the mashings presented linear increases of the refractive index during the temperature steps, which were influenced by the concentrations of sugars produced in each step. Cauchy parameters obtained by refractive index interpretation showed the influence of carbohydrates on absorption in the infrared region, and amino acids on absorption in the ultraviolet region. Strong correlation was obtained between the refractive index and °Bx values, indicating that the WLI technique is a potential analytical method for monitoring the mashing process during beer production.

4.
Appl Opt ; 55(24): 6639-43, 2016 Aug 20.
Artículo en Inglés | MEDLINE | ID: mdl-27556983

RESUMEN

A dispersive white-light Michelson interferometer was used to determine the wavelength dependence of the refractive index (n) in the visible range from 425 to 775 nm and the thermo-optical coefficient (dn/dT) of fused silica (FS) and borosilicate glass (BK7). For FS, the values obtained for n and dn/dT at 546 nm were 1.46079 and 11.3×10-6 K-1, respectively, while the values for BK7 glass were 1.51825 and 2.2×10-6 K-1, respectively, which is in good agreement with the literature. The accuracy of the methodology used for n was almost 10-6, enabling precise spectroscopic characterization of materials across a wide spectral range.

5.
Genet Mol Res ; 13(4): 10035-48, 2014 Nov 28.
Artículo en Inglés | MEDLINE | ID: mdl-25501215

RESUMEN

The cuticular chemical composition plays a significant role in the recognition of nest mates in social insects, thus functioning as a chemical signature of the colony. The structure of cuticular chemicals is subject to interference from genetic and exogenous factors, including diet. In this study, various colonies of the Ectatomma brunneum ant were removed from their natural environment and housed in a laboratory to monitor the response of the cuticular chemical composition to dietary changes. Analyses were performed using gas chromatography and Fourier transform infrared photoacoustic spectroscopy, which has not been previously used for this type of analysis. The results indicate that this method is useful for analyzing biological and natural systems. We observed changes in the chemical signature with food traces in the first 30 days under feed control. Therefore, genetic information may not be the only criterion that can be used to describe the chemical signature of a species; environmental variations also influence recognition signals. Furthermore, these results reinforce the reliability of the Fourier transform infrared photoacoustic spectroscopy method.


Asunto(s)
Hormigas/química , Dieta , Integumento Común/fisiología , Técnicas Fotoacústicas , Animales , Cromatografía de Gases , Análisis Discriminante , Ionización de Llama , Hidrocarburos/análisis , Espectroscopía Infrarroja por Transformada de Fourier , Vibración
6.
Opt Lett ; 38(4): 422-4, 2013 Feb 15.
Artículo en Inglés | MEDLINE | ID: mdl-23455089

RESUMEN

We report a theoretical model and experimental results for laser-induced lensing in solids. The model distinguishes and quantifies the contributions from population and thermal effects. Laser-induced lensing in ytterbium-doped fluorozirconate glass ZBLAN:Yb(3+) is measured, and the thermal and optical properties obtained from analyzing the data with the proposed model agree well with published values. Photothermal techniques are used extensively for the investigation of laser and laser-cooling materials, and the model developed here enables the interpretation of convoluted laser-induced lensing signals that have contributions from different sources.

7.
Opt Lett ; 38(22): 4667-70, 2013 Nov 15.
Artículo en Inglés | MEDLINE | ID: mdl-24322101

RESUMEN

Resonant excited state absorption (ESA) and relaxation processes in Tb(3+)-doped aluminosilicate glasses are quantitatively evaluated. A model describing the excitation steps and upconversion emission is developed and applied to interpret the results from laser-induced surface deformation using thermal mirror spectroscopy. The fluorescence quantum efficiency of level (5)D(4) was found to be close to unity and concentration independent while, for the level (5)D(3), it decreases with Tb(3+) concentration. Emission spectroscopy measurements supported these results. ESA cross sections are found to be more than three orders of magnitude higher than the ground state absorption cross section.


Asunto(s)
Silicatos de Aluminio/química , Calcio/química , Lentes , Microscopía Fluorescente/instrumentación , Resonancia por Plasmón de Superficie/métodos , Terbio/química , Termografía/instrumentación , Absorción , Diseño de Equipo , Análisis de Falla de Equipo , Vidrio/química , Luz , Ensayo de Materiales/instrumentación , Dispersión de Radiación
8.
Int Endod J ; 46(8): 700-9, 2013 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-23442003

RESUMEN

Diabetes mellitus (DM) is one of the most common metabolic disorders. DM is characterized by hyperglycaemia, resulting in wound healing difficulties and systemic and oral manifestations, which have a direct effect on dental pulp integrity. Experimental and clinical studies have demonstrated a higher prevalence of periapical lesions in patients with uncontrolled diabetes. The influence of DM on periapical bone resorption and its impact on dental intervention of such patients are reviewed, and its aetiology and pathogenesis are analysed at molecular level. Pulps from patients with diabetes have the tendency to present limited dental collateral circulation, impaired immune response, increased risk of acquiring pulp infection (especially anaerobic ones) or necrosis, besides toothache and occasional tendency towards pulp necrosis caused by ischaemia. In regard to molecular pathology, hyperglycaemia is a stimulus for bone resorption, inhibiting osteoblastic differentiation and reducing bone recovery. The relationship between poorly controlled diabetes and bone metabolism is not clearly understood. Molecular knowledge about pulp alterations in patients with diabetes could offer new therapeutic directions. Knowledge about how diabetes affects systemic and oral health has an enduring importance, because it may imply not only systemic complications but also a higher risk of oral diseases with a significant effect on pulp and periapical tissue.


Asunto(s)
Complicaciones de la Diabetes , Periodontitis Periapical/complicaciones , Pulpitis/complicaciones , Pérdida de Hueso Alveolar/complicaciones , Complicaciones de la Diabetes/sangre , Complicaciones de la Diabetes/fisiopatología , Humanos , Hiperglucemia/complicaciones , Factores de Riesgo , Tratamiento del Conducto Radicular
9.
Opt Express ; 20(9): 10034-41, 2012 Apr 23.
Artículo en Inglés | MEDLINE | ID: mdl-22535094

RESUMEN

In this paper we report results of tunable lighting in Ce(3+)/Eu(2+,3+) doped low silica calcium aluminosilicate glass. Optical spectroscopy experiments indicate that there is a red color compensation from Eu(2+) and Eu(3+) to the green emission from Ce(3+), resulting in a broad and tunable emission spectra depending on the excitation wavelength. This result analysed in the CIE 1976 color diagram shows a close distance from the Plank emission and a correlated color temperature, varying from 5200 to 3500K. This indicates that our system can be easily excited by GaN based blue LEDs, being an interesting phosphor for white lighting devices.


Asunto(s)
Cesio/química , Color , Vidrio/química , Iluminación/instrumentación , Refractometría/instrumentación , Diseño de Equipo , Análisis de Falla de Equipo
10.
Genet Mol Res ; 11(3): 1891-8, 2012 Jul 19.
Artículo en Inglés | MEDLINE | ID: mdl-22869544

RESUMEN

One of the most important attributes that allowed the evolution and maintenance of sociality in insects is their ability to distinguish members of their own colonies. The capacity for individual recognition in social insects is mediated by chemical signals that are acquired soon after the adult emerges, and vary according to the tasks performed by individuals in their colonies. We determined the time when adults of the wasp Mischocyttarus consimilis acquire the chemical signature of their colonies, as well as the variation in the cuticular hydrocarbon profiles of the exoskeleton of individuals, according to their functions in the colony. The method used was Fourier transform infrared photoacoustic spectroscopy directly on the gaster of each individual. Young wasps take three to four days to acquire the colony's chemical signature, with a small change on the fifth day, when the cuticular hydrocarbon profile of the workers is more similar to that of the queens than that of the males, probably because they are of the same sex, but primarily because of the similarity of tasks executed by these two groups of females in the colonies.


Asunto(s)
Envejecimiento/metabolismo , Feromonas/metabolismo , Avispas/crecimiento & desarrollo , Avispas/metabolismo , Animales , Análisis Discriminante , Femenino , Jerarquia Social , Masculino , Espectroscopía Infrarroja por Transformada de Fourier , Vibración
11.
J Photochem Photobiol B ; 227: 112379, 2022 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-34998114

RESUMEN

In this work the thermal diffusivity (D) of Astyanax lacustris fish scale is investigated aiming to use it for environmental integrity certification. The D values were obtained by a relatively simple procedure by a photoacoustic method. The chosen fish species is from wide occurrence in Brasil's basins. It has short migration, and it has also been used as environmental bioindicator. The results obtained in 195 scales sampled from three different streams in the Midwest region in Brazil gives an average value of D ~ 4 × 10-3 cm2/s. ANCOVA analysis demonstrated that D values are able to differentiate among the three basins and indicates that it is dependent on the scales thickness and water conductivity. This last one is strongly affected by biotic and abiotic actions, so that D values measured by photoacoustic method can be used for interpreting the environmental integrity from where the fishes were sampled.


Asunto(s)
Monitoreo del Ambiente , Peces , Animales , Brasil , Ecosistema , Monitoreo del Ambiente/métodos , Análisis Espectral
12.
J Photochem Photobiol B ; 236: 112587, 2022 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-36283255

RESUMEN

Nanoemulsions are increasingly gaining importance in the development of topically applied medicine and cosmetic products because their small droplets favor the penetration rates of active compounds into the body. In this scenario, the measurements of their diffusion rates as well as eventual physicochemical changes in the target tissues are of utmost importance. It is also recognized that the use of natural surfactants can avoid allergic reactions as frequently observed for synthetic products. The natural saponins extracted from Sapindus Saponaria have the property of forming foam and are exploited as biocompatible and biodegradable, while cellulose nanocrystals are known to increase the stability of a formulation avoiding the coalescence of drops at the interface. Therefore, nanoemulsions combining natural saponins and cellulose nanocrystals are promising systems that may facilitate greater diffusion rates of molecules into the skin, being candidates to substitute synthetic formulations. This study applied the Photoacoustic Spectroscopy technique to measure the diffusion rates and the physicochemical properties of nanoemulsified formulations containing saponins and cellulose nanocrystals topically applied to the skin. The ex vivo study combined the first-time photoacoustic measurements performed in both ultraviolet-visible and mid-infrared spectral regions. The toxicity of these formulations in L929 cells was also evaluated. The results showed that the formulations were able to propagate throughout the skin to a depth of approximately 756 µm, reaching the dermal side. The non-observation of absorbing band shifting or new bands in the FTIR spectra suggests that there were no structural changes in the skin as well as in the formulations after the nanoemulsions administration. The cytotoxicity results showed that the increase of cellulose nanocrystals concentration decreased cellular toxicity. In conclusion, the results demonstrated the advantage of combining photoacoustic methods in the ultraviolet-visible and mid-infrared spectral regions to analyze drug diffusion and interaction with the skin tissues. Both methods complement each other, allowing the confirmation of the nanoemulsion diffusion through the skin and also suggesting there were no detectable physicochemical changes in the tissues. Formulations stabilized with saponins and cellulose nanocrystals showed great potential for the development of topically administered cosmetics and drugs.


Asunto(s)
Nanopartículas , Saponinas , Espectroscopía Infrarroja por Transformada de Fourier , Celulosa , Saponinas/farmacología , Nanopartículas/química , Preparaciones Farmacéuticas , Emulsiones/química
13.
J Med Virol ; 83(2): 208-17, 2011 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-21181914

RESUMEN

During recent years, vaccination against hepatitis A has been implemented in several countries. It is expected that the increase in mass vaccination against hepatitis A will eventually result in a decreased prevalence of anti-HAV antibodies in the general population. For this reason, a suitable clinical sample for diagnosis of hepatitis A must be sufficiently sensitive to enable detection of lower antibodies titers. In this study, the feasibility of using dried blood spots (DBS) was assessed for the detection of anti-HAV antibodies after a natural infection and vaccination. Seventy-four DBS and paired plasma samples were obtained from a group of college students for a cross-sectional hepatitis A seroepidemiological study. Forty-six students seronegative for anti-HAV were selected randomly and immunized with an inactivated hepatitis A vaccine using an 0-6 month schedule. Seroconversion was monitored in paired plasma and DBS samples 6 months after the first dose followed by a period of 8 and 24 months after the second dose. A strong correlation between OD/CO rates of paired plasma and DBS samples for the detection of anti-HAV was observed. The sensitivity and specificity of the DBS compared with plasma for the detection of anti-HAV antibodies after natural infection was 100%. The sensitivity of DBS in samples collected 24 months after the second dose of hepatitis A vaccine was 95.4%. The results showed that DBS samples can be used for the detection of anti-HAV antibodies both after natural infection or vaccination.


Asunto(s)
Anticuerpos de Hepatitis A/sangre , Vacunas contra la Hepatitis A/inmunología , Virus de la Hepatitis A Humana/inmunología , Hepatitis A/diagnóstico , Técnicas para Inmunoenzimas , Vacunación , Brasil/epidemiología , Femenino , Hepatitis A/sangre , Hepatitis A/epidemiología , Hepatitis A/inmunología , Humanos , Masculino , Sensibilidad y Especificidad , Estudios Seroepidemiológicos , Manejo de Especímenes , Adulto Joven
14.
Climacteric ; 14(5): 551-7, 2011 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-21469974

RESUMEN

OBJECTIVE: To evaluate the effect of drospirenone with 17ß-estradiol on the histology and expression of estrogen and progesterone receptors and of Bcl-2 protein, in endometrium of postmenopausal women. METHOD: Forty postmenopausal women, including controls, participated in this study evaluating oral hormone replacement treatment combining 2 mg/day of drospirenone with 1 mg/day of 17ß-estradiol administered for a 24-week period. The effect on the endometrium was assessed by histology and the apoptosis marker Bcl-2. The immunoexpression of estrogen (ER) and progesterone (PR) receptors in the endometrium was also measured. RESULTS: No increase in endometrial thickness was evident after either treatment, although endometrial histology was atrophic in most biopsies. The drospirenone/estradiol group showed higher expression of ER and PR in glandular epithelium compared to stroma, but the Bcl-2 protein was more immunoreactive in stroma than in glandular epithelium. Compared to controls, drospirenone/estradiol users showed higher immunoexpression of ER, PR and Bcl-2 in both glandular epithelium and endometrial stroma. CONCLUSION: A 24-week course of drospirenone with 17ß-estradiol resulted in low proliferation and was shown to lead to atrophic endometrium. The novel progestogen drospirenone seems to have favorable effects on the endometrium of postmenopausal women due to its pro-apoptotic action in glandular epithelium.


Asunto(s)
Androstenos/administración & dosificación , Endometrio/efectos de los fármacos , Estradiol/administración & dosificación , Posmenopausia , Proteínas Proto-Oncogénicas c-bcl-2/análisis , Receptores de Esteroides/análisis , Endometrio/química , Endometrio/diagnóstico por imagen , Terapia de Reemplazo de Estrógeno , Femenino , Humanos , Inmunohistoquímica , Persona de Mediana Edad , Antagonistas de Receptores de Mineralocorticoides/administración & dosificación , Congéneres de la Progesterona/administración & dosificación , Estudios Prospectivos , Receptores de Estrógenos/análisis , Receptores de Progesterona/análisis , Ultrasonografía
15.
J Fish Biol ; 79(7): 2095-105, 2011 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-22141910

RESUMEN

This study documents unexpectedly low levels of intra and interpopulation genetic diversity in Kryptolebias ocellatus, an androdioecious and predominantly self-fertilizing killifish from south-eastern Brazil. This finding generally is inconsistent with the established opinion that the K. ocellatus and K. marmoratus clade originated in this geographic region and later dispersed northward into the Caribbean.


Asunto(s)
Ciprinodontiformes/genética , Variación Genética , Animales , Brasil , Ciprinodontiformes/clasificación , Filogenia
16.
Opt Lett ; 35(7): 1055-7, 2010 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-20364215

RESUMEN

We recently reported that Ti(3+)-doped low-silica calcium aluminosilicate glass presents long luminescence lifetime (170 micros) and broad emission band (190 nm) shifted toward the visible region when compared with those from Ti(3+):sapphire single crystal and Ti(3+)-doped glasses [Phys. Rev. Lett.100, 027402 (2008)]. Here we demonstrate that this glass also shows high values of both gain cross section (approximately 4.7 x 10(-19) cm(2)) and luminescence quantum efficiency (approximately 70%). By comparing these values with those for Ti(3+):sapphire crystal, we can conclude that the studied Ti(3+)-doped glass is a promising system for tunable solid-state lasers.

17.
Eur J Clin Microbiol Infect Dis ; 28(10): 1167-76, 2009 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-19468763

RESUMEN

The replication of hepatitis A virus (HAV) is via a complementary negative-strand RNA. Each negative strand may serve as a template for the synthesis of many positive strands. The aim of this study was to detect the intermediate replicative (negative strand) of HAV in order to monitor its replication in vitro and in vivo. Real-time polymerase chain reaction (PCR) was standardized to detect the intermediate replicative of HAV in cell culture and liver from non-human primates infected experimentally. HAV primers from the 5' non-translated region and VP3 were used in the cDNA synthesis of negative-strand RNA. The negative strand was detected in the infected cell lines and liver by highly strand-specific rTth recombinant Thermus thermophilus DNA polymerase reverse transcription followed by quantitative PCR. The results indicate that the negative-strand HAV RNA can be detected in vivo and in vitro. This model is an approach for assessing the dynamic patterns of replication and should represent a valuable tool for the monitoring of HAV replications in cell cultures and for the evaluation of experimental infections in animal models.


Asunto(s)
ADN Complementario/biosíntesis , Virus de la Hepatitis A/fisiología , Hepatitis A/virología , Reacción en Cadena de la Polimerasa/métodos , ARN Viral/genética , Replicación Viral/fisiología , Regiones no Traducidas 5' , Animales , Proteínas de la Cápside , Células Cultivadas , Modelos Animales de Enfermedad , Amplificación de Genes , Virus de la Hepatitis A Humana/fisiología , Humanos , Cinética , Hígado/virología , Fragmentos de Péptidos , Reacción en Cadena de la Polimerasa/normas , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa/métodos , Sensibilidad y Especificidad
18.
Appl Opt ; 48(30): 5728-32, 2009 Oct 20.
Artículo en Inglés | MEDLINE | ID: mdl-19844308

RESUMEN

Thermal lens (TL) spectrometry was applied to soybean biodiesel samples, in order to assess the behavior of their thermo-optical properties during the preparation before and after the washing process. The study was based on the thermal diffusivity parameter, which is highly sensitive and is related to the chemical composition of the sample. The results showed a difference of approximately 20% between the initial (unwashed) and the final (washed) steps of biodiesel production. This behavior indicates that the residue of the biodiesel production influences the thermal diffusivity value. Consequently, TL spectrometry can be a useful methodology for certifying the quality of biodiesel during production.


Asunto(s)
Antioxidantes/química , Fuentes de Energía Bioeléctrica , Difusión , Diseño de Equipo , Etanol/química , Calor , Metanol/química , Óptica y Fotónica , Aceite de Soja/química , Glycine max , Espectrofotometría/métodos
19.
Spectrochim Acta A Mol Biomol Spectrosc ; 217: 190-196, 2019 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-30939365

RESUMEN

The thermoxidation of biodiesel was monitored using different spectroscopic techniques: UV-Vis and MIR absorption, Raman spectroscopy, and visible fluorescence. As the oxidation progressed, the UV-Vis absorption spectra showed an increase in the spectral range between 34,000 and 26,000 cm-1, while two main fluorescence bands (under ultraviolet excitation) were observed at around 21,000 and 15,000 cm-1. The UV-Vis absorption and fluorescence intensities presented opposite behavior during the processes, irrespective of the temperature used (90, 140, or 190 °C). These effects could be explained by the consumption of natural antioxidants, followed by the formation of primary oxidation compounds. The Raman and MIR absorption results indicated the existence of a cis-trans isomerization effect, followed by the formation of hydroperoxides during the oxidation, with the behavior being the same as that revealed by the UV-Vis absorption and fluorescence analyses. The comparison, under the same conditions, of different spectroscopy techniques that can be used to monitor the stages of thermoxidation of soybean biofuel provides important information for selection of an appropriate technique for evaluating biodiesel integrity.


Asunto(s)
Biocombustibles/análisis , Glycine max/química , Calor , Espectrometría de Fluorescencia/métodos , Espectrofotometría Ultravioleta/métodos , Espectrometría Raman/métodos , Oxidación-Reducción
20.
Neotrop Entomol ; 48(6): 1030-1038, 2019 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-31456168

RESUMEN

Chemical compounds present on the cuticle of social insects are important in communication, as they are used in recognition of nestmates and sexual partners as well as in caste distinction, varying according to several factors, such as genetic and environmental. In this context, some studies have explored the cuticular chemical profile as a tool for assessing intra- and interspecific differences in social insects, although few studies have investigated this in social wasps. This study aimed to assess the differences in cuticular chemical profiles among different geographic samples of the wasp Mischocyttarus consimilis Zikán. Our hypothesis was that environmental factors are decisive to compose the cuticular chemical profiles of colonies of these social wasps and that there are differences regarding the geographic distribution among colonies. We used Fourier Transform Infrared-Photoacoustic Spectroscopy (FTIR-PAS) to assess the chemical profiles of samples. Our results show that despite there are differences between the cuticular chemical composition of the wasps' samples from different populations, there is no significant correlation compared to the spatial distribution of the colonies nor with the environment. Thus, our hypothesis was refuted, and we can infer that in this species neither exogenous nor genetic factors stand out to differentiate the chemical signature of their colonies, but a combination of both.


Asunto(s)
Estructuras Animales/química , Variación Biológica Poblacional , Espectroscopía Infrarroja por Transformada de Fourier , Avispas/química , Animales , Brasil , Geografía
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