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1.
Rev. habanera cienc. méd ; 20(2): e2957, mar.-abr. 2021. tab
Article in Spanish | LILACS, CUMED | ID: biblio-1251793

ABSTRACT

Introducción: Existen plantas que se usan desde tiempos ancestrales con efecto alucinógeno y alteraciones al sistema nervioso central, debido a la presencia principalmente de mezcalina son usadas para cumplir objetivos tradicionales asociados a la adivinación, curandería, divinidad y otros. Objetivos: Determinar el efecto del extracto acuoso de Trichocereus pachanoi a dosis de 10 por ciento, 20 por ciento y 30 por ciento sobre el comportamiento exploratorio de carácter depresivo en Rattus rattus var. albinus. Material y métodos: El presente estudio experimental es de carácter exploratorio aplicado, constructivo y prospectivo, se formaron 4 grupos de 10 ratas cada uno a las que se les administró extracto acuoso de Trichocereus pachanoi en dosis creciente, luego fueron sometidas a natación forzada con entrenamiento previo de 15 minutos. Resultados: El grupo que no recibió tratamiento alguno posee la más baja respuesta en gasto de tiempo para el escalamiento, comparado con los grupos B, C y D que presentan 13,5 min. 17,17 min. y 24,37 min. respectivamente. También en la evaluación de la movilidad, el grupo A posee en valor más bajo, comparado con los grupos B, C y D que presentan 13,42 min. 17,62 min. y 23,12 min., respectivamente. Conclusiones: El tratamiento en ratas con extracto acuoso de Trichocereus pachanoi a concentraciones de 10 por ciento, 20 por ciento y 30 por ciento ha sido eficaz en producir un efecto tranquilizante en el comportamiento exploratorio de carácter depresivo en el sujeto(AU)


Introduction: Since ancient times, some mescaline containing plants that have hallucinogen effects and cause alterations in the central nervous system have been used to fulfill traditional objectives associated with divination, healing, spirituality and others. Objective: To determine the effect of the aqueous extract of Trichocereus pachanoi at doses of 10 %, 20 % and 30 % solution on depression-like exploratory behavior in Rattus rattus var. albinus. Material and Methods: The present experimental study, which is exploratory, constructive and prospective in nature, was conducted in 4 groups of 10 rats. The rats were administered increasing doses of aqueous extract of Trichocereus pachanoi; then, they underwent forced swimming with a previous 15-minute training. Results: The group that did not receive any treatment had the lowest response to the duration of time spent at scaling compared to groups B, C and D that spent 13.5 min., 17.17 min., and 24.37 min., respectively. Also, in the evaluation of mobility, group A showed the lowest value compared to groups B, C and D that recorded 13.42 min., 17.62 min., and 23.12 min., respectively. Conclusions: The treatment with aqueous extract of Trichocereus pachanoi at concentrations of 10 percent, 20 percent and 30 percent applied to rats has been effective in producing a tranquilizer effect on the depression-like exploratory behavior in rats(AU)


Subject(s)
Rats , Tranquilizing Agents , Central Nervous System , Exploratory Behavior , Hallucinogens , Mescaline
2.
Rev. biol. trop ; 64(2): 897-911, abr.-jun. 2016. tab, ilus
Article in English | LILACS | ID: biblio-843322

ABSTRACT

AbstractSince 1983, San Pedro Bay in the Philippines had been reported to be the site of episodic Pyrodinium bahamense var. compressum blooms that caused paralytic shellfish poisoning in its nearby coastal communities. This bay is also subjected to numerous storms; the strongest was super typhoon Haiyan in November 8, 2013. For the first time, the seasonal dynamics of potentially toxic and harmful phytoplankton in this bay is elucidated. This is also the first record of a bloom of the cyanobacteria, Trichodesmium erythraeum that reached 70 000 colonies/L in April 2013 in this area. There were other 19 potentially toxic and harmful phytoplankton encountered during the sampling period. These consisted of a haptophyte, Phaeocystis globosa, the diatom Pseudonitzschia and 17 dinoflagellates. Seven of these harmful algae had densities high enough to be traced through time. Normally, diatoms abound during the dry season. But Pseudo-nitzschia increased in abundance during the wet season of 2012 and 2013. The dinoflagellates and Phaeocystis globosa behaved as expected and exhibited a relative increase in cell density during the rainy season of both years too. High nutrient availability during this season must have influenced the behavior of the phytoplankton despite differences in temperature and light intensity among seasons. Other notable but rare harmful species found only in plankton net tows during the study were Pyrodinium bahamense var. compressum, Alexandrium tamiyavanichii, Cochlodiniumpolykrikoides, and Noctiluca scintillans. Rev. Biol. Trop. 64 (2): 897-911. Epub 2016 June 01.


ResumenDesde 1983, la Bahía de San Pedro en Filipinas ha sido reportada como un sitio de proliferación de Pyrodinium bahamense var. compressum que causó intoxicación paralítica en sus comunidades costeras cercanas. Esta bahía también está sometida a numerosas tormentas; entre las más fuertes se presentó un súper tifón en Haiyan, el 8 de noviembre 2013. Por primera vez, se explica la dinámica estacional del fitoplancton potencialmente tóxico y dañino en esta bahía. Este es también el primer registro en esta área de una proliferación de cianobacterias (Trichodesmium erythraeum) que alcanzó 70 000 colonias/L en abril 2013. Durante el periodo de muestreo se presentaron otras 19 proliferaciones de fitoplancton potencialmente tóxicas y dañinas. Estos consistían en una haptófita, Phaeocystis globosa, la diatomea Pseudo-nitzschia y 17 dinoflagelados. Siete de estas algas nocivas tenían densidades suficientemente altas como para ser rastreadas a través del tiempo. Normalmente, las diatomeas abundan durante la estación seca. Pero Pseudo-nitzschia aumentó en abundancia durante la temporada de lluvias de 2012 y 2013. Los dinoflagelados y Phaeocystis globosa se comportaron como se esperaba y exhibieron un aumento relativo de la densidad celular durante la temporada de lluvias en los dos años. La alta disponibilidad de nutrientes durante esta temporada debe haber influido en el comportamiento del fitoplancton a pesar de las diferencias en la temperatura y la intensidad de la luz entre estaciones. Otras especies nocivas notables, pero raras que se encontraron sólo en las redes de arrastre de plancton durante el estudio fueron: Pyrodinium bahamense var. compressum, Alexandriumtamiyavanichii, Cochlodinium polykrikoides y Noctiluca scintillans.


Subject(s)
Phytoplankton/microbiology , Trichodesmium/growth & development , Philippines , Seasons , Environmental Monitoring , Bays
3.
Rev. biol. trop ; 59(2): 693-708, jun. 2011. ilus, tab
Article in Spanish | LILACS | ID: lil-638113

ABSTRACT

Ichthyofauna from wetlands of San Pedro, Balancán, Tabasco, México. San Pedro River’s wetlands sustain trophic nets in the fluvial system, due to the high habitat availability, and space and temporal variations. In order to describe the relationship between environmental parameters and ichthyofauna, this study evaluated fish assemblages composition, distribution, abundance, density, biomass, richness species, diversity and equitability in the wetlands. Sampling considered three different sites and climatic seasons (dry, rainy and cold fronts). The physical and chemical parameters considered were dissolved oxygen, temperature, pH, water transparency and the depth. Fishes were caught with a shrimp net, after six minutes towings and were identified afterwards. A total of 1 049 organisms of 25 fish species were caught, two of which were exotic species: Oreochromis niloticus and Parachromis managuense. A total of 23 species were found at site I (with the highest density 0.23ind./m²), 17 at site II (0.23ind./m²) and 14 at site III (0.12ind./m²). The dry season had the highest species number with 21 species, followed by the rainy season with 17 species, and the cold season with five species. Similarly, the highest biomass (8.30g/m²) was found in dry season, followed by the rainy (2.16g/m²) and the cold seasons (0.03g/m²). Considering seasons, highest density was found during the dry (0.436ind./m²), followed by the rainy (0.213ind./m²) and the cold (0.023ind./m²) seasons. The dominant density species during the study period, according to the quadrants graphic of Olmstead-Tukey were: Petenia splendida, Vieja heterospila, Vieja synspila, Dorosoma petenense and Astyanax aeneus. There were significant differences in the species richness among sites. Temperature, depth and transparency showed differences among the seasons. The canonical correspondence analysis indicated that fish distribution was governed by environmental parameters during all seasons. In terms of fish abundance and composition, environmental parameters play an important role showing spatial and temporal differences in the ecosystem, this could be explained with the fact that most of young fishes have a movement behavior to the wetlands, searching refuge and feed during the dry season. Considering the diversity indexes variation, it may be concluded that San Pedro River’s wetlands correspond to a system where the ichthyofauna composition fluctuates spatial and seasonally. Rev. Biol. Trop. 59 (2): 693-708. Epub 2011 June 01.


Los humedales de San Pedro sostienen redes tróficas del sistema fluvial debido a la alta disponibilidad de hábitats y a sus variaciones espacio-temporales. En esta investigación se estudió la composición, densidad y biomasa de la ictiofauna de los humedales; se capturaron 1 049 organismos de 25 especies, dos son exóticas: Oreochromis niloticus y Parachromis managuense. Con 23 especies capturadas en el sitio I, 17 en el II y 14 en el III. En la época de secas se obtuvo mayor riqueza con 21 especies, lluvias con 17 y cinco en nortes. La mayor densidad se mostró en el sitio II (0.23ind./m²), seguido de los sitios I y III (0.12, 0.12ind./m²). La mayor biomasa fue en secas (8.30g/m²), seguida de lluvias (2.1g/m²) y por último nortes (0.01g/m²). La mayor densidad se mostró en secas (0.43ind./m²) y la mínima en nortes (0.023ind./m²). Las especies dominantes en densidad según el diagrama Olmstead-Tukey fueron: Petenia splendida, Vieja heterospila, Vieja synspila, Dorosoma petenense y Astyanax aeneus. Por lo tanto, existieron diferencias significativas en los parámetros ecológicos y ambientales. Al considerar la variación en la riqueza podemos concluir que los humedales del río San Pedro, es un sistema donde la composición de la ictiofauna responde a las fluctuaciones espaciales y temporales.


Subject(s)
Animals , Ecosystem , Fishes/classification , Rivers , Wetlands , Biodiversity , Biomass , Mexico , Population Density , Population Dynamics , Seasons
4.
Rev. cient. (Guatem.) ; 5(1): 65-90, 2009.
Article in Spanish | LILACS | ID: lil-655702

ABSTRACT

El presente estudio analizó la distribución de la vegetación en el volcán San Pedro en términos de su riqueza, composición, estructura, y abundancia, con base en la posible relación que esta guarde con los cambios de exposición y altitud observados en el volcán. Para el efecto, el área con cobertura vegetal se dividió en tres pisos de altitud a partir de los 2,400 msnm hasta la cumbre a 3,020 msnm y en cuatro secciones verticales en relación a los cuatro puntos cardinales, dando como resultado el arreglo del área en 12 sub-áreas o estratos relativamente más homogéneos(en cuanto a altitud y exposición). En total se obtuvo una muestra de 36 unidades (parcelas de Whittaker de 0.1 Ha), correspondiendo tres parcelas por cada estrato...


Subject(s)
Asteraceae , Fabaceae , Flora , Guatemala , Orchidaceae , Poaceae , Solanaceae , Volcanoes
5.
Hist. ciênc. saúde-Manguinhos ; 14(3): 907-919, jul.-set. 2007. ilus
Article in Portuguese | LILACS | ID: lil-466593

ABSTRACT

A força da tradição é capaz de preservar costumes que caminham na contramão da trajetória sociocultural das populações urbanas atuais. Costumes como os rituais de sacrifício, apesar de muitas vezes condenados pela sociedade e de terem sofrido um sincretismo adaptativo, ainda guardam elementos tradicionais, confirmando sua importância como mediadores entre os mundos natural e sobrenatural. Um bom exemplo são as lutas rituais Tinku, identificadas em amostras esqueléticas pré-colombianas provenientes do deserto de Atacama, Chile, e que ainda persistem entre grupos andinos, com uma abrangência temporal de pelo menos 1.200 anos. O objetivo principal dessa luta é provocar o sangramento e a morte de seus participantes, oferecidos à divindade Pachamama para propiciar a fertilidade da terra e dos animais. Os rituais de sacrifício, como símbolos de identidade social, nos ajudam a conhecer melhor o ethos de sociedades passadas e atuais.


The power of tradition is capable of preserving customs that go counter to the social and cultural trends in today's urban centers. Though customs such as rites of sacrifice are often condemned by society and have undergone an adaptive syncretism, they still preserve ancient traditional elements that underline their importance as mediators between the natural and supernatural worlds. A good example of this is the Tinku ritual fight, identified in samples of Pre-Columbian skeletons from the Atacama desert in Chile, which continues to this day amongst Andean groups, having survived for at least 1,200 years. The main objective in this fight is that the participants bleed to death as offerings to the divinity, Pachamama, to assure the fertility of the land and the animals. When rites of sacrifice are understood as symbols of social identity, they give us a better understanding of the ethos of past and present societies, from a very particular perspective.


Subject(s)
Humans , Ceremonial Behavior , Magic/history , Religion , Indians, South American , Chile , Anthropology, Cultural
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