3,874 research outputs found

    Spice plants as a biology learning resource based-education for sustainable development

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    Studying biology has research topics that are closely related to all the living things around the student and important for them to understand thoroughly. One of the local potentials in the environment around students that can be used as a source of learning biology is spice plants. This research is a qualitative descriptive study. The research aims to describe the spice plants in the Botanical Smartpark, which can be used as learning resources. The result of this research shows that there are 57 species and 27 families of spice plants found at the Botanical Smartpark, Yogyakarta, Indonesia. Spice plant biology objects can be used in biology learning by using project-based learning and socio-scientific issues-based learning models. In addition, this local potential can support education for sustainable development (ESD), through environmental conservation

    How predictable are evolutionary responses to environment? Comparing trait-environment relationships among three species of Asteraceae forbs in the Great Basin

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    Restoring native forbs in the Great Basin Desert is an important part of regenerating a healthy landscape that benefits wildlife, plant communities, and humans. Despite their importance and contribution to plant diversity, forbs have been understudied relative to grasses and shrubs. To begin bridging this knowledge gap, we examined three Asteraceae species (Chaenactis douglasii, Dieteria canescens, Erigeron pumilus) collected from a wide geographic area and grown in common garden experiments, asking how variable these species and populations are, how their traits were associated with environment of origin, and how two of the three species responded to water addition in direct-seeding environments. We also asked if trait-environment relationships were similar among these three species. As expected, we found that populations were extremely variable, and that much of this variation was significantly different among populations, with some variation explained by the ecoregion where populations were gathered. All three species had at least one trait strongly correlated with an environmental variable, sometimes in similar ways. For example, we found a consistent relationship where plants from higher elevation locations flowered earlier across all species, as well as a relationship with plant height and mean annual temperature, with taller plants sourced from warmer areas. Across species, the strongest trait-environment relationships we found were found for plant height, flowering phenology, and flower production, though there was variation in which environmental variables were most correlated with these responses. Our results suggest that approaches that generalize across species, even closely related ones, may not be adequate when determining whether a potential seed-source is well-matched to a target restoration site. Instead, our results support the idea that species-specific seed zones (areas where seeds can be moved without loss of performance) should be developed to help make this decision. Additionally, we found that environmental variables such as mean annual temperature and elevation were highly associated with traits that are typically considered important in restoration, i.e. phenology, number of inflorescences, and plant size. Therefore, before species-specific seed zones are available, we may be able to use these environmental factors as proxies to help us better match seed sources to target restoration sites. Finally, we also found that at least one species (C. douglasii) emerged from seed more readily when it was sourced from a drier origin, in both ambient and water addition conditions. Although more research needs to be done in this area, this suggests that seeds sourced from drier locations may be better suited for restoration projects that are being direct-seeded

    UJI POTENSI EKSTRAK DAUN KIPAHIT (Tithonia diversifolia (Hamsl.) A. Gray) DALAM MENGHAMBAT PERTUMBUHAN Athelia rolfsii Curzi SECARA IN VITRO

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    UJI POTENSI EKSTRAK DAUN KIPAHIT (Tithonia diversifolia (Hamsl.) A.Gray) DALAM MENGHAMBAT PERTUMBUHAN Athelia rolfsii Curzi SECARA IN VITRO Rangga Hidayat Nur (11880210196) Di bawah bimbingan Yusmar Mahmud dan Irwan Taslapratama INTISARI Athelia rolfsii Curzi merupakan patogen tanaman dengan inang yang luas. Salah satu cara pengendaliannya adalah dengan menggunakan ekstrak daun kipahit sebagai pestisida nabati karena mengandung senyawa anti jamur seperti alkaloid, flavonoid, tannin, saponin, steroid dan tripernoid. Penelitian ini bertujuan untuk mendapatkan konsentrasi yang paling efektif dalam mengendalikan A. rolfsii secara in vitro. Penelitian telah dilaksanakan Bulan Juni sampai Agustus 2022 di Laboratorium Patologi, Entomologi, Mikrobiologi dan Ilmu Tanah Fakultas Pertanian dan Peternakan Universitas Islam Negeri Sultan Syarif Kasim Riau. Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan 6 perlakuan konsentrasi yaitu 0%,1%,3%,5%,7% dan 8% diulang sebanyak 5 kali. Parameter yang diamati meliputi uji fitokimia, karakteristik makroskopis, laju pertumbuhan dan daya hambat. Hasil penelitian ini menunjukkan bahwa ekstrak daun kipaphit tidak potensial dalam menghambat pertumbuhan A. rolfsii. Kata Kunci: hortikultura, pestisida nabati, rebah semai

    Caracterizaci贸n morfol贸gica y agron贸mica de plantas M1 de caf茅 var. T铆pica obtenidas con irradiaci贸n gamma en San Ram贸n - Chanchamayo

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    Universidad Nacional Agraria La Molina. Facultad de Agronom铆a. Departamento Acad茅mico de FitotecniaSe evalu贸 el comportamiento en condiciones de campo de la generaci贸n M1 de plantas de caf茅 (Coffea arabica L. var. T铆pica) derivadas de semillas secas inducidas con 100 Gy de rayos gamma luego de tres a帽os de trasplantadas, en funci贸n de la supervivencia, las caracter铆sticas morfol贸gicas, producci贸n de frutos y respuesta contra la roya y cercosporiosis del caf茅. La tasa de supervivencia fue menor en las plantas M1 con valores de 20,6% frente a 38,4% del control. Se observaron formas de hoja diferentes en m谩s del 32% de las plantas M1 y modificaciones en el 谩pice de la hoja en m谩s del 27% de las plantas M1. El color de las hojas j贸venes vari贸 del control en el 13% de plantas M1, mientras que para las hojas maduras difirieron el 7,8% de estas. En general, la altura fue menor en plantas M1, donde la mayor铆a tuvo valores inferiores a la m铆nima correspondiente a las plantas control; se observaron tendencias similares para el di谩metro del tallo, n煤mero de ramas, longitud de ramas y longitud y ancho de hojas. Por otro lado, m谩s del 30% de plantas M1 no produjeron ning煤n fruto, siendo 47 el n煤mero promedio de frutos por cada planta M1, en comparaci贸n con 520 de las plantas de control; adem谩s, menos del 2% de las plantas M1 produjeron similar n煤mero de frutos que las plantas control. Asimismo, el peso estimado de 100 frutos fue menor en plantas M1, mientras que el porcentaje de frutos anormales fue mayor para estas. La incidencia de la roya del caf茅 aument贸 con el tiempo y fue mayor en los tercios inferiores en ambos grupos evaluados, pero en general, se observaron valores m谩s bajos en las plantas M1, de las cuales el 25% tuvo menor incidencia que todas las plantas control.The behaviour under field conditions of the M1 generation of coffee plants (Coffea arabica L. var. T铆pica) derived from dry seeds induced with 100 Gy of gamma rays was evaluated in terms of survival, morphological characteristics, fruit production and response against coffee leaf rust and cercosporiosis. The survival rate was lower in M1 plants with values of 20.6% compared to 38.4% for the control. Different leaf shapes were observed on more than 32% of M1 plants and leaf apex modifications were observed on more than 27% of them. The colour of young leaves varied from the control in 13% of M1 plants, while mature leaves differed in 7.8% of M1 plants. In general, height was lower in M1 plants, where the majority had lower values than the minimum corresponding to control plants; similar trends were observed for stem diameter, number of branches, branch length and leaf length and width. On the other hand, more than 30% of M1 plants did not produce any fruit, with an average number of 47 fruits per M1 plant, compared to 520 for the control plants, and less than 2% produced a similar number of fruits as the control plants. Also, the estimated weight of 100 fruits was lower on M1 plants, while the percentage of abnormal fruits was higher for them. Coffee leaf rust incidence increased over time and was higher in the lower thirds in both groups tested, but in general, lower values were observed in M1 plants, 25% of which had lower incidence than all control plants

    El cultivo de stevia (Stevia rebaudiana Bertoni) en el valle del Alto Mayo

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    Universidad Nacional Agraria La Molina. Facultad de Agronom铆a. Departamento Acad茅mico de Entomolog铆aLa stevia es un cultivo nuevo que se ofrece como una importante alternativa para tratar enfermedades como la diabetes y la obesidad, ya que sus hojas contienen mol茅culas edulcorantes de bajo o nulo aporte cal贸rico que no incrementan los niveles de az煤car en la sangre. El presente trabajo resume mi experiencia profesional de aproximadamente ocho a帽os en la empresa Stevia One Per煤 SAC, en el manejo del cultivo de Stevia (Stevia rebaudiana Bertoni) en el valle del Alto Mayo, regi贸n de San Mart铆n, Per煤; en las 谩reas de Investigaci贸n y Desarrollo (I+D) y Operaciones (Producci贸n Agr铆cola). Se describe de manera general al cultivo, describiendo algunos aspectos y consideraciones para su manejo agron贸mico en algunas etapas productivas como propagaci贸n in-vitro, propagaci贸n por esquejes, siembra, manejo sanitario de plagas y enfermedades, entre otras; as铆 como las potencialidades para su comercializaci贸n e industrializaci贸n. Dos ensayos agr铆colas son descritos: Primero, un ensayo sobre el 鈥楨fecto de la densidad de siembra en el rendimiento de hoja seca y acumulaci贸n de esteviol glic贸sidos en cultivo de stevia鈥; y segundo, la 鈥楧eterminaci贸n de curva de crecimiento (altura) y acumulaci贸n de Rebaudi贸sido A en hojas secas de Stevia鈥橲tevia is a new crop that it is offered as an important alternative to treat diseases such as diabetes and obesity, since its leaves contain sweetener molecules with low or no caloric intake that do not increase blood sugar levels. The present work summarizes my professional experience of approximately eight years in the Company Stevia One Peru SAC, in the management of the cultivation of Stevia (Stevia rebaudiana Bertoni) in the Alto Mayo valley, San Martin region, Per煤; in the areas of Research and Development (R&D) and Operations (Agricultural Production). The cultivation it鈥檚 described in a general way, with some aspects and considerations for its agronomic management in some productive stages such as in-vitro propagation; propagation by cuttings, sowing, sanitary management for pests and diseases, among others, as well as the potential for its commercialization and industrialization. Two agricultures essays are described: first, an essay on the 鈥楨ffect of planting density on dry leaf yield and accumulation of steviol glycosides in stevia鈥; and second, a 鈥楧etermination of growth curve (height) and accumulation of Rebaudioside A in dried leaves of stevia鈥. Both essays were conducted as part of my performance in the Research and Development area

    Oksidacija mravlje kiseline na platinskim katalizatorima na Ni nosa膷u

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    Pollution caused by the usage of fossil fuels is a consequence of industrialization, urbanization, and technological development, having a huge impact on the environment and human health. Thus, one of the biggest challenges that currently confront not only the scientific community but also humanity is reducing the use of fossil fuels, as well as the production and consumption of energy using renewable energy sources. In the last decades, small organic molecules such as methanol, ethanol and formic acid have attracted attention due to their properties that make them convenient for use in fuel cells. Among other precious metals, Pt is the most investigated as a promising catalyst for the anodic electrooxidation reaction of small organic molecules. However, high price, scarceness and susceptibility to poisoning are some of the limiting factors for the commercial use of pure Pt. There are two ways to mitigate those problems: lower the content of a noble metal present or make the catalyst more active for the particular reaction. To address the first problem nanocatalyst, produced by the deposition of platinum onto high surface area supports were introduced. A far greater challenge is to modify the catalyst to make it not just more active, but more stable as well, for a particular reaction. It is now well known that bimetallic catalysts fulfill these requirements quite well, and currently, they are widely used in many catalytic and electrocatalytic processes. In this study, a thin Pt film was electrochemically deposited on nickel support (Pt/Ni) and afterward subjected to the controlled thermal treatment in an attempt to reduce the proneness of Pt to poisoning species (CO) and therefore improve its catalytic performance at low potentials in the formic oxidation reaction. All produced catalysts were electrochemically characterized using cyclic voltammetry and oxidation of CO monolayer, while the influence of thermal annealing on the morphology was monitored using an atomic force microscope (AFM). Finally, catalyst performance was tested in a formic acid electrooxidation reaction. The obtained results clearly show that the exceptional activity for formic acid electrooxidation, measured on annealed Pt/Ni is a direct consequence of the nature of the substrate which manifests itself after controlled heat treatment through surface reconstruction and bifunctional effect

    Citotoxicidad in vitro en c茅lulas madre de c谩ncer g谩strico y toxicidad aguda oral de los extractos metan贸licos de hojas de Piper aduncum, Buddleja incana y Dracontium spruceanum

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    Determina citotoxicidad in vitro sobre las c茅lulas madre del c谩ncer g谩strico en la l铆nea celular adenocarcinoma (AGS) de los extractos metan贸licos de las hojas de Piper aduncum, Buddleja incana y Dracontium spruceanum, usando como indicador de resazurina y evaluar la viabilidad celular por el m茅todo de fluorescencia en 24 y 48 h. Obteni茅ndo como resultado que el Piper aduncun tiene una mayor actividad citot贸xica sobre las c茅lulas madre aisladas de la l铆nea celular AGS de c谩ncer g谩strico con una concentraci贸n inhibitoria media hasta 37,15 渭g/mL, siendo este valor muy cercano a la concentraci贸n recomendada por en el Instituto Nacional de C谩ncer consider谩ndose como un extracto crudo eficaz, mientras que los extractos metan贸licos de las hojas de Buddleja incana y Dracontium spruceanum tienen una concentraci贸n inhbitoria media mayor a 160 渭g/mL considerando no tan eficaces; y la toxicidad aguda oral de los tres extractos metan贸licos en ratones albinos hembras Mus musculus se realiz贸 mediante la metodolog铆a establecida por el ensayo de toxicidad aguda oral seg煤n OECD 423 (Organizaci贸n para la Cooperaci贸n y el Desarrollo Econ贸micos), dando como resultado una dosis letal media mayor a 5000 mg/kg

    Evaluaci贸n de diferentes dosis de antioxidante en lechuga (Lactuca Sativa L.) variedad sementel y su efecto en la calidad postcosecha en condiciones de refrigeraci贸n.

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    La investigaci贸n se realiz贸 en la planta procesadora de frutas y hortalizas de la Estaci贸n Experimental y Pr谩cticas de la Facultad de Ciencias Agron贸micas de la Universidad de El Salvador, consisti贸 en la evaluaci贸n de diferentes dosis de antioxidante en lechuga (Lactuca sativa L.) variedad sementel y su efecto en la calidad postcosecha en condiciones de refrigeraci贸n 5掳C, con el prop贸sito de mantener sus caracter铆sticas organol茅pticas y alargar su vida de anaquel. El experimento se realiz贸 en el periodo del 9 al 20 de junio 2022. Los tratamientos fueron representados por las 3 dosis de antioxidante; tratamiento 1: 谩cido asc贸rbico en dosis de 0.5%; tratamiento 2: 谩cido asc贸rbico en dosis de 1% y tratamiento 3: 谩cido asc贸rbico en dosis de 1.5% aplicados a las lechugas, estas fueron sometidas a un proceso de selecci贸n, lavado, desinfectado, aplicaci贸n de antioxidante, secado y almacenado. Para monitorear la vida de anaquel se tomaron datos el d铆a 1, d铆a 5 y d铆a 11 de par谩metros de pH, acidez titulable, solidos solubles totales, apariencia del tallo, oscurecimiento del tallo , turgencia general y sabor, para el an谩lisis de los datos se utiliz贸 un dise帽o completo al azar, el nivel de significancia fue del 1% (P鈮0.01), siendo los factores en estudio las tres dosis de antioxidante y el testigo, para determinar si las fuentes de variaci贸n en estudio produc铆an iguales o distintos efectos en la variable respuesta, se aplic贸 la t茅cnica del an谩lisis de varianzas y prueba de tukey en el programa estad铆stico INFOSTAT. Los mejores tratamientos para la conservaci贸n de la lechuga de hoja variedad sementel a temperatura 5 潞C fueron las dosis de 谩cido asc贸rbico de 1% y de 1.5%. En ambos tratamientos la lechuga conserv贸 sus caracter铆sticas sensoriales; apariencia del tallo, oscurecimiento del tallo, turgencia general y sabor aceptable, durante los 11 d铆as de almacenamiento. A diferencia de las muestras no tratadas, donde la aceptabilidad para el consumo seg煤n atributos sensoriales se reduce a los 5 d铆as, debido al presencia de pardeamiento enzim谩tico. La turgencia general fue el atributo mejor evaluado; mientras que el sabor no tuvo ninguna diferencia con las lechugas no tratadas. Con respecto a los par谩metros fisicoqu铆micos de pH y acidez no tuvieron efectos significativos, a diferencia de la variable de solidos solubles totales la cual presento respuestas significativas al aplicar las diferentes dosis de 谩cido asc贸rbico. Palabras claves: antioxidante, pardeamiento enzim谩tico, calidad postcosecha, turgencia

    IDENTIFIKASI JENIS-JENIS TUMBUHAN SEMAK DI AREA KAMPUS 2 UIN ALAUDDIN DAN SEKITARNYA

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    Penelitian deskriptif ini bertujuan untuk mengidentifikasi jenis-jenis tumbuhan semak yang ada di area kampus 2 UIN Alauddin dan sekitarnya. Penelitian dilakukan pada bulan Agustus 2011 di area kampus 2 UIN Alauddin dan sekitarnya selama 3 hari dengan menggunakan metode jelajah yang dibagi dalam 13 stasiun. Dari hasil penelitian ini menunjukkan bahwa jenis-jenis tumbuhan semak yang terdapat di area kampus 2 UIN Alauddin dan sekitarnya terdiri dari 14 jenis diantaranya adalah putri malu (Mimosa pudica), rembete (Mimosa invisa), gandarusa (Justiciandarussa), jarong (Stachytarpheta jamaicensis), kembang telekan (Lantana camara), tapak dara (Catharanthus roseus), biduri (Calatropis gigantea), terongan (Solanum torvum), sida guri (Sida rhombifolia), cabe kecil (Capsicum frutescens), beluntas (Pluchea indica), kemangi (Ocimum basilicum), kirinyuh (Eupatorium inulifolium), dan soka (Ixora coccinea)
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