Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 6 de 6
Filter
Add more filters











Publication year range
1.
Plants (Basel) ; 12(11)2023 May 29.
Article in English | MEDLINE | ID: mdl-37299121

ABSTRACT

The propagation of strelitzia plants can be carried out in vitro as an alternative to combine the aseptic conditions of the culture medium with the use of strategies to promote germination and controlled abiotic conditions. However, this technique is still limited by the prolonged time and low percentage of seed germination, which is the most viable explant source, due to dormancy. Thus, the objective of this study was to evaluate the influence of chemical and physical scarification processes of seeds combined with gibberellic acid (GA3), as well as the effect of graphene oxide in the in vitro cultivation of strelitzia plants. Seeds were subjected to chemical scarification with sulfuric acid for different periods (10 to 60 min) and physical scarification (sandpaper), in addition to a control treatment without scarification. After disinfection, the seeds were inoculated in MS (Murashige and Skoog) medium with 30 g L-1 sucrose, 0.4 g L-1 PVPP (polyvinylpyrrolidone), 2.5 g L-1 Phytagel®, and GA3 at different concentrations. Growth data and antioxidant system responses were measured from the formed seedlings. In another experiment, the seeds were cultivated in vitro in the presence of graphene oxide at different concentrations. The results showed that the highest germination was observed in seeds scarified with sulfuric acid for 30 and 40 min, regardless of the addition of GA3. After 60 days of in vitro cultivation, physical scarification and scarification time with sulfuric acid promoted greater shoot and root length. The highest seedling survival was observed when the seeds were immersed for 30 min (86.66%) and 40 min (80%) in sulfuric acid without GA3. The concentration of 50 mg L-1 graphene oxide favored rhizome growth, while the concentration of 100 mg L-1 favored shoot growth. Regarding the biochemical data, the different concentrations did not influence MDA (Malondialdehyde) levels, but caused fluctuations in antioxidant enzyme activities.

2.
Orinoquia ; 25(1): 67-77, Jan.-June 2021. tab, graf
Article in Spanish | LILACS-Express | LILACS | ID: biblio-1351172

ABSTRACT

Resumen Dentro de las estrategias de evaluación de especies forestales nativas por parte de la Corporación Colombiana de Investigación Agropecuaria - AGROSAVIA, se encuentra la caracterización fenotípica. Con el propósito de validar el uso de descriptores morfológicos y determinar la variabilidad fenotípica de la colección de trabajo del Centro de Investigación La Libertad ubicado en el piedemonte llanero (Villavicencio, Meta); se evaluaron 121 individuos de machaco (Simarouba amara Aubl.) de 6.2 años de edad, por medio de 34 descriptores de planta, hoja y fruto. Los datos cualitativos y cuantitativos se analizaron mediante análisis de correspondencias múltiples y análisis de componentes principales respectivamente, con el fin de reducir la dimensionalidad de los datos, seguido de análisis de conglomerados, utilizando el algoritmo de WARD para el agrupamiento de los individuos. Los resultados obtenidos permitieron identificar que el volumen de tronco presentó la mayor variabilidad (31.13%) y las variables cuantitativas asociadas al tamaño y diámetro de la copa, diámetro de fuste, volumen del tronco, longitud y ancho de la hoja, altura total y de copa presentaron las mayores correlaciones con los tres primeros componentes principales (57.82%). Se obtuvieron nueve conglomerados que reúnen el 95.73% de la variabilidad original y en los cuales se encontraron individuos potencialmente útiles con fines maderables, arboricultura y sistemas agroforestales. La forma del fuste, la altura de ramificación y de bifurcación, el tipo de corteza y el hábito de fructificación presentaron mínima variación en los individuos, contrario a la rectitud del fuste y la forma de la copa.


Abstract Phenotyping is one of the strategies used by Corporación Colombiana de Investigación Agropecuaria (AGROSAVIA) for evaluating native forest species. One hundred and twenty-one 6.2 year-old mountain damson/stavewood/bitterwood/paradise trees (Simarouba amara Aubl. commonly known as machaco in Colombia) were evaluated using 34 plant, leaf and fruit descriptors to validate the use of morphological descriptors and determine the phenotype variability of AGROSAVIA's La Libertad Research Centre's working collection. The centre is located in the foothills of Colombia's eastern plains (Villavicencio, Meta). Multiple correspondence analysis (MCA) was used for analysing qualitative data and principal component analysis (PCA) for +data to reduce dataset dimensionality; this was followed by cluster analysis, using Ward's method (minimum variance method or Ward's minimum - agglomerative algorithm) for hierarchical cluster analysis for grouping the trees. The results led to identifying that the wood volume descriptor had the greatest variability (31.13%) and the quantitative variables associated with crown size and diameter, stem diameter, trunk volume, leaf length and width, total and crown height had the greatest correlation with the first three components (57.82%). Nine clusters were obtained (accounting for 95.73% of original variability) and in which trees were found for timber, arboriculture and agroforestry system purposes. The trees' stem shape, branch height and bifurcation, the type of bark and fruiting habits had minimum variation, contrary to the that found regarding stem straightness and crown shape.


Resumo Dentro das estratégias de avaliação de espécies florestais nativas pela Colombian Agricultural Research Corporation - AGROSAVIA, está a caracterização fenotípica. A fim de validar o uso de descritores morfológicos e determinar a variabilidade fenotípica da coleção de trabalhos do Centro de Pesquisa La Libertad localizado no sopé da planície, (Villavicencio, Meta); 121 indivíduos de machaco (Simarouba amara Aubl.) de 6,2 anos de idade foram avaliados por meio de 34 descritores de planta, folha e fruto. Os dados qualitativos e quantitativos foram analisados por meio da análise de correspondência múltipla e da análise de componentes principais, respectivamente, a fim de reduzir a dimensionalidade dos dados, seguida da análise de cluster, por meio do algoritmo WARD, para agrupamento dos indivíduos. Os resultados obtidos permitiram identificar que o volume do tronco apresentou a maior variabilidade (31,13%) e as variáveis quantitativas associadas ao tamanho e diâmetro da copa, diâmetro do caule, volume do tronco, comprimento e largura da folha, total a altura e a copa apresentaram as maiores correlações com os três primeiros componentes principais (57,82%). Foram obtidos nove aglomerados que atendem a 95,73% da variabilidade original e nos quais foram encontrados indivíduos potencialmente úteis para fins madeireiros, arboricultura e sistemas agroflorestais. O formato do caule, a altura da ramificação e bifurcação, o tipo de casca e o hábito de frutificação apresentaram variação mínima nos indivíduos, ao contrário da retidão do caule e do formato da copa.

3.
Food Chem ; 309: 125761, 2020 Mar 30.
Article in English | MEDLINE | ID: mdl-31757490

ABSTRACT

Innovative chemometric approaches by NMR and LC-MS data fusion (multiblock analysis) and decomposition of the GC-MS raw data by PARADISe were applied to evaluate the influence of thermal and non-thermal processing on the composition of cashew apple juices. Comparative investigations by Principal Component Analysis (PCA) highlighted pronounced effect of thermal processing on juice compared to non-thermal processing, as decreases of anacardic acids, sucrose, malic acid, tyrosine, phenylalanine, and important flavor compounds (esters, aldehydes, and ketones). Ultrasound presented relevant influence on increase of anacardic acids concentration. Non-thermal processing carried out at more intense conditions (10 min of ultrasound, 5 min of ozone, and pulsed light at 10 V) showed pronounced effect compared to other non-thermal processing. Although individual PCA enables to detect the influence of different processing technologies, data fusion and PARADISe presented advantages, since a more comprehensive understanding of the relationship among chemical changes from different analytical techniques were established.


Subject(s)
Anacardium/chemistry , Fruit and Vegetable Juices/analysis , Anacardic Acids/analysis , Anacardium/metabolism , Chromatography, High Pressure Liquid , Gas Chromatography-Mass Spectrometry , Hot Temperature , Magnetic Resonance Spectroscopy , Malates/analysis , Ozone/chemistry , Principal Component Analysis , Sonication , Tandem Mass Spectrometry , Ultraviolet Rays
4.
Rev. bras. psicanál ; 46(4): 149-162, out.-dez. 2012. ilus
Article in Portuguese | LILACS-Express | LILACS, Index Psychology - journals | ID: biblio-1138262

ABSTRACT

Este trabalho contém o relato de uma experiência clínica envolvendo a decisão de aceitar ou não em análise um jovem que despertou em mim fortes sentimentos conflitantes. Inspirada por associações com a figura de Satã, de O paraíso perdido, de John Milton, focalizo essencialmente o processo interno vivido por mim, destacando o que chamarei de visão interior e sua relação com o conceito kleiniano de bom objeto internalizado. Detenho-me no relato da sessão e estendo-me em reflexões posteriores, que possibilitaram minha organização pessoal daquela experiência.


This work reports on a clinical experience involving the decision of a psychoanalyst to accept or not a young patient who stirred strong conflicting feelings in her. Inspired by associations with the figure of Satan in Paradise lost, by John Milton, the author focuses essentially on the internal process experienced by the psychoanalyst, highlighting what she herself calls inner vision and its relation with the Kleinian concept of the internalized good object. The author fully describes the session and extends into subsequent reflections which enabled the personal organization of that experience.


Este trabajo contiene un relato de una experiencia clínica involucrando la decisión de aceptar, o no, analizar a un joven que ha despertado en la psicoanalista fuertes sentimientos contradictorios. Inspirada por asociaciones con la figura de Satán, de El paraíso perdido, de John Milton, la autora focaliza esencialmente el proceso interno vivido, destacando lo que llama visión interior y su relación con el concepto kleiniano de buen objeto internalizado. Se detiene en el relato de la sesión y se extiende en reflexiones posteriores, que permitieron su organización personal de aquella experiencia.

5.
Rev. bras. psicanál ; 44(2): 147-157, 2010.
Article in Portuguese | LILACS, Index Psychology - journals | ID: lil-693125

ABSTRACT

A partir de situações clínicas são discutidos fatores envolvidos no ato suicida, consciente ou inconsciente. Propõe-se que o suicida falhou em tornar o Inferno (no qual vive) habitável, dando-lhe sentido. Para escapar de seus tormentos fantasia Paraíso, onde todas as necessidades são satisfeitas, diferente de Nada. Tudo e Nada, incognoscíveis, se confundem. Buscando compreensão, utiliza-se o mito de Adão e Eva: a ingestão do fruto proibido sinaliza, ao mesmo tempo, contato com a realidade (Inferno) e surgimento da capacidade de pensar (simbolização e transformação de Inferno). Discutem-se situações próximas ao aniquilamento, a erotização da morte e aquelas em que se cria carapaça protetora contra a realidade, atacando-se a vida e a criatividade. Impulsos homicidas se tornam suicidas objetivando vida imaginária dentro do outro. Finalmente, propõe-se considerar Paraíso fetiche substitutivo de Nada impensável, o que acarreta consequências para a psicanálise.


Se discuten factores relacionados con el acto suicida, consciente o inconsciente, a través de situaciones clínicas. Se propone que el suicida falló a la hora de transformar el Infierno (donde vive) en un lugar habitable, que le dotara de sentido. Todo ello para escapar de sus tormentos, fantasía el Paraíso, donde todas sus necesidades son satisfechas, a diferencia de la Nada. El Todo y la Nada, irreconocibles, se confunden. Buscando la comprensión se utiliza el mito de Adán y Eva: la ingestión del fruto prohibido señala, al mismo tiempo, contacto con la realidad (Infierno) y el surgimiento de la capacidad de pensar. Se discuten situaciones cercanas al aniquilamiento, la erotización de la muerte y a aquellas en que se crea un escudo protector contra la realidad, atacándose la vida y la creatividad. Impulsos homicidas y suicidas objetivan la vida imaginaria dentro del otro. Finalmente, se propone considerar al Paraíso como fetiche substituto de la Nada impensable, lo cual trae diversas consecuencias para el Psicoanálisis.


Facts involved in the act of suicide, whether conscious or not, are discussed by means of clinical situations. The suicidal is supposed to have failed to make the Hell (in which he lives) habitable, giving sense to it. To escape from his torments, he fantasizes Paradise, where all his needs are fulfilled, unlike Nothingness. Everything and Nothingness, unknowable, will become one. Seeking comprehension, the author uses the myth of Adam and Eve: the ingestion of the forbidden fruit suggests, simultaneously, contact with reality (Hell) and the emergence of the capacity of thinking (symbolization and transformation of Hell). Situations close to annihilation are discussed, as is the eroticism of death, as well as situations in which a protective shell is constructed against reality, attacking life and creativity. Homicidal impulses become suicidal, aiming towards an imaginary life within the latter. Finally, the consideration of Paradise as a substitute fetish of unthinkable Nothingness is proposed, which results in consequences for Psychoanalysis.


Subject(s)
Humans , Psychoanalysis , Psychotic Disorders , Suicide , Drive
6.
Rev. bras. psicanál ; 44(2): 147-157, 2010.
Article in Portuguese | Index Psychology - journals | ID: psi-69678

ABSTRACT

A partir de situações clínicas são discutidos fatores envolvidos no ato suicida, consciente ou inconsciente. Propõe-se que o suicida falhou em tornar o Inferno (no qual vive) habitável, dando-lhe sentido. Para escapar de seus tormentos fantasia Paraíso, onde todas as necessidades são satisfeitas, diferente de Nada. Tudo e Nada, incognoscíveis, se confundem. Buscando compreensão, utiliza-se o mito de Adão e Eva: a ingestão do fruto proibido sinaliza, ao mesmo tempo, contato com a realidade (Inferno) e surgimento da capacidade de pensar (simbolização e transformação de Inferno). Discutem-se situações próximas ao aniquilamento, a erotização da morte e aquelas em que se cria carapaça protetora contra a realidade, atacando-se a vida e a criatividade. Impulsos homicidas se tornam suicidas objetivando vida imaginária dentro do outro. Finalmente, propõe-se considerar Paraíso fetiche substitutivo de Nada impensável, o que acarreta consequências para a psicanálise.(AU)


Se discuten factores relacionados con el acto suicida, consciente o inconsciente, a través de situaciones clínicas. Se propone que el suicida falló a la hora de transformar el Infierno (donde vive) en un lugar habitable, que le dotara de sentido. Todo ello para escapar de sus tormentos, fantasía el Paraíso, donde todas sus necesidades son satisfechas, a diferencia de la Nada. El Todo y la Nada, irreconocibles, se confunden. Buscando la comprensión se utiliza el mito de Adán y Eva: la ingestión del fruto prohibido señala, al mismo tiempo, contacto con la realidad (Infierno) y el surgimiento de la capacidad de pensar. Se discuten situaciones cercanas al aniquilamiento, la erotización de la muerte y a aquellas en que se crea un escudo protector contra la realidad, atacándose la vida y la creatividad. Impulsos homicidas y suicidas objetivan la vida imaginaria dentro del otro. Finalmente, se propone considerar al Paraíso como fetiche substituto de la Nada impensable, lo cual trae diversas consecuencias para el Psicoanálisis.(AU)


Facts involved in the act of suicide, whether conscious or not, are discussed by means of clinical situations. The suicidal is supposed to have failed to make the Hell (in which he lives) habitable, giving sense to it. To escape from his torments, he fantasizes Paradise, where all his needs are fulfilled, unlike Nothingness. Everything and Nothingness, unknowable, will become one. Seeking comprehension, the author uses the myth of Adam and Eve: the ingestion of the forbidden fruit suggests, simultaneously, contact with reality (Hell) and the emergence of the capacity of thinking (symbolization and transformation of Hell). Situations close to annihilation are discussed, as is the eroticism of death, as well as situations in which a protective shell is constructed against reality, attacking life and creativity. Homicidal impulses become suicidal, aiming towards an imaginary life within the latter. Finally, the consideration of Paradise as a substitute fetish of unthinkable Nothingness is proposed, which results in consequences for Psychoanalysis.(AU)


Subject(s)
Suicide , Drive , Psychotic Disorders , Psychoanalysis
SELECTION OF CITATIONS
SEARCH DETAIL