Results 21 to 30 of about 238 (104)

Efeitos de herbicidas nos teores de clorofilas de Spirodela punctata [PDF]

Planta Daninha, 1999
Com o objetivo de verificar na planta aquática Spirodela punctata o efeito de diferentes concentrações (0,005; 0,05; 0,5 e 5 mgL-1 de ingrediente ativo) dos herbicidas butachlor, glyphosate e propanil sobre os teores de clorofila a, b e na razão clorofila a/b, foram conduzidos, por sete dias completos, bioensaios em sala climatizada.
Santos, Durvalina M. M. dos, Pitelli, Robinson A., Banzatto, David A.   +2 more
openaire   +5 more sources

Seasonal and intracanopy shifts in the fates of absorbed photons in central Amazonian forests: implications for leaf fluorescence and photosynthesis

New Phytologist, Volume 248, Issue 1, Page 76-91, October 2025.
Summary Recent studies have shown a linear relationship between solar‐induced Chl fluorescence (SIF) and gross primary productivity (GPP) at large scales. However, this relationship diverges at finer leaf scales, particularly in tropical forests with complex canopy structures.
Leonardo G. Ziccardi, David Kramer, Nathan Gonçalves, Bruce W. Nelson, Tyeen Taylor, Loren P. Albert, Kleber S. Campos, Neill Prohaska, Natalia Restrepo‐Coupe, Scott R. Saleska, Scott C. Stark   +10 more
wiley   +1 more source

Estimating chlorophyll content from Eucalyptus dunnii leaves by reflectance values

Semina: Ciências Agrárias, 2016
This study aimed to estimate photosynthetic pigments contents from leaves of Eucalyptus dunni Maiden based on values of reflectance spectra of red, green and blue colors obtained with a digital color analyzer.
João Alexandre Lopes Dranski, Ubirajara Contro Malavasi, Marlene de Matos Malavasi   +2 more
doaj   +1 more source

Environmental and human factors shape the trophic ecology of a widespread marine predator

Journal of Animal Ecology, Volume 94, Issue 9, Page 1784-1799, September 2025.
Our study reveals how environmental factors and fishing pressure influence swordfish diet, highlighting trophic shifts under future climate scenarios. We provide a novel framework to strengthen our ability to plan for and manage the redistribution of species under global change ensuring that the energetic needs of predators are met.
Elena Fernández‐Corredor, Alba Fuster‐Alonso, Francisco Ramírez, Joan Giménez, Salvador García‐Barcelona, David Macías, Marta Coll, Joan Navarro   +7 more
wiley   +1 more source

Assessing Closed Hydroponic Subsystems for Batavia Lettuce Growth Under Different Planting Densities

World Water Policy, Volume 11, Issue 2, Page 427-438, May 2025.
ABSTRACT Hydroponic systems have the potential to be sustainable and alternative methods for food production that confer advantages of high production and better control of growth. However, only a few studies have focused on leafy vegetable growth in different subsystems and environmental variables.
Demet Çekin, Hamis El‐Gabry, Ricarda Lothmann, Nayira Hassan, Mariam Hassanen, Mostafa Hassanen, Hani Sewilam   +6 more
wiley   +1 more source

Neutralização da toxina tetânica pela clorofila hidrossolúvel

Revista da Faculdade de Medicina Veterinária, Universidade de São Paulo, 1950
Confirming the studies of F onseca R ibeiro and Guimaraes, the authors showed besides that with a contact for 15 minutes, 0.5 ml. of hydro-soluble chlorophyll at 1% neutralizes 500 M.L.D. of tetanic toxine; that 100 ml. of tetanic toxine (concentration of 1 ml. = 15,000 M.L.D. guinea pigs) in contact with 1,0 g.
Fonseca Ribeiro, Paulo Maria Gonzaga de Lacerda Jr.   +1 more
openaire   +2 more sources

Quantificação da área e do teor de clorofilas em folhas de plantas jovens de videira 'Cabernet Sauvignon' mediante métodos não destrutivos Non-destructive quantification of area and chlorophyll content in the leaves of young 'Cabernet Sauvignon' grapevines

Revista Brasileira de Fruticultura, 2009
Este trabalho foi conduzido visando a desenvolver métodos não destrutivos para estimar a área foliar e o conteúdo de clorofilas em folhas de plantas jovens de videira 'Cabernet Sauvignon'.
Cassandro Vidal Talamini do Amarante, Odimar Zanuzo Zanardi, Aquidauana Miqueloto, Cristiano André Steffens, Joni Erhart, Jaime Antonio de Almeida   +5 more
doaj   +1 more source

Hurricane‐induced changes in mayfly assemblage structure, production and emergence in a tropical island stream Cambios inducidos por los huracanes en la estructura, producción, y emergencia del ensamblaje de Ephemeroptera de una quebrada de isla tropical

Ecological Entomology, Volume 50, Issue 1, Page 201-213, February 2025.
Hurricanes create major disturbances to stream ecosystems by producing large floods and removing riparian vegetation. Understanding their impacts is a priority, as hurricane intensity will increase with global climate change. Hurricane disturbance shifts mayfly assemblages from dominance by Leptophlebiidae before to Baetidae after.
Alonso Ramírez, Ana M. Meza‐Salazar, Jesús E. Gómez, Pablo E. Gutiérrez‐Fonseca, José Sánchez‐Ruiz   +4 more
wiley   +1 more source

Photosynthetic behaviour during the leaf ontogeny of rubber tree clones[Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], in Lavras, MG Comportamento fotossintético durante a ontogenia foliar de clones de seringueira, [Hevea brasiliensis (Wild. ex. Adr. de Juss.) Muell. Arg.], em Lavras, MG

Ciência e Agrotecnologia, 2007
This work proposed to investigate changes in the photosynthetic behavior during the leaf ontogeny of the during the leaf development. Up to the 32nd day of leaf age (stage B2), the net photosynthesis was negative due to the inefficiency of the ...
Aurélio Antas Miguel, Luiz Edson Mota de Oliveira, Paulo Araquém Ramos Cairo, Davi Melo de Oliveira   +3 more
doaj   +1 more source

Metabolitos secundarios y clorofilas en cempasúchil en respuesta a estrés salino

Revista Mexicana de Ciencias Agrícolas, 2018
Factores de estrés bióticos y abióticos tienen inf luencia en la biosíntesis de metabolitos secundarios en algunas especies medicinales. En este sentido, se ha reportado que el estrés salino altera las propiedades bioquímicas de un gran número de cultivos.
Ma. Guadalupe Peralta-Sánchez, Libia Iris Trejo-Téllez, Fernando Carlos Gómez-Merino, Ma. de las Nieves Rodríguez-Mendoza, Miguel Ángel Serrato-Cruz, J. Cruz García-Albarado   +5 more
openaire   +2 more sources