Results 51 to 60 of about 93,656 (273)

Tracing holotype trajectories: Mapping the movement of the most valuable herbarium specimens

PLANTS, PEOPLE, PLANET, EarlyView.
Global efforts to protect biodiversity depend on fair access to key plant specimens. This study examines the distribution of 119,361 holotypes—unique herbarium specimens used to formally describe new plant species. By linking collection and storage data, we found that holotypes are increasingly held closer to their places of origin, particularly in ...
Dominik Tomaszewski, Łukasz Walas, Marzenna Guzicka   +2 more
wiley   +1 more source

Tannins in Baccharis dracunculifolia (Asteraceae): effects of seasonality, water availability and plant sex Taninos em Baccharis dracunculifolia (Asteraceae): efeitos da sazonalidade, disponibilidade de água e sexo da planta

Acta Botânica Brasílica, 1999
Several ecological, genetic, and environmental factors are known to influence tannin concentration in plant tissues. In this study, the effects of seasonality, water availability, and sex of the plant on tannin concentration in the dioecious shrub ...
Mário M Espírito-Santo, G. Wilson Fernandes, Luciana R Allain, Ticiana R. F Reis   +3 more
doaj   +1 more source

Hybrid Force Control with on/off Electropneumatic Standard Distributors [PDF]

International Journal of Fluid Power, 2006
This paper presents a new control method applied to the electro-pneumatic field. This strategy originates from the hybrid control theory recently developed for the control of asynchronous or synchronous electrical motors, e.g. Retif (2004). The interest of this strategy concerns the possibility of using standard on/off distributors instead of the usual
Sellier, Arnaud, Brun, Xavier, Sesmat, Sylvie, Rétif, Jean-Marie, Lin-Shi, Xuefang, Thomasset, Daniel, Smaoui, Mohamed   +6 more
openaire   +2 more sources

Iowa Population Exposures to Metals and Metalloids in Well Water

Environmental Toxicology, EarlyView.
ABSTRACT Previous Iowa studies suggest low levels and chronic arsenic exposures are associated with prostate cancer. The rural Iowa population heavily relies on private wells for drinking water resources and thus is vulnerable to contaminants such as heavy metals found in well water.
Donald L. Simmons, Brian Wels, Alyssa Mattson, Elizabeth M. Miller, Zachary E. Hoggarth, Maya Sternberg, Susie Y. Dai, Dustin May, Michael Schueller, Michael Pentella   +9 more
wiley   +1 more source

Dinâmica da água nas palhadas de milho, milheto e soja utilizadas em plantio direto Water fluxes in maize, millet and soybean plant-residue mulches used in direct seeding

Pesquisa Agropecuária Brasileira, 2006
O objetivo deste trabalho foi avaliar o efeito das palhadas de milho, milheto e soja na capacidade de interceptação e de armazenamento de água, velocidade de dessecamento, porcentagem de cobertura do solo, interceptação da radiação solar e escoamento ...
Fernando Antônio Macena da Silva, Hilton Silveira Pinto, Eric Scopel, Marc Corbeels, François Affholder   +4 more
doaj   +1 more source

Scaling from microsite to landscape to resolve litter decomposition dynamics in globally extensive drylands

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Decomposition is the transformation of dead organic matter into its inorganic constituents. In most biomes, decomposition rates can be accurately predicted with simple mathematical models, but these models have long under‐predicted decomposition in globally extensive ...
Heather L. Throop, Jiwei Li, Daryl L. Moorhead, Sasha C. Reed, Katherine E. O. Todd‐Brown, Alexi C. Besser, Dellena Evelyn Bloom, Thomas C. Ingalls, Alejandro Cueva   +8 more
wiley   +1 more source

Rapid diagnosis of respiratory distress syndrome by oral aspirate in premature newborns

Jornal de Pediatria (Versão em Português), 2019
Objective: The stable microbubble test on gastric aspirate and on amniotic fluid has been used for the diagnosis of respiratory distress syndrome in the newborn. However, no study has performed this test on oral aspirates from premature infants.
Manoel Antonio da Silva Ribeiro, Humberto Holmer Fiori, Jorge Hecker Luz, Pedro Celiny Ramos Garcia, Renato Machado Fiori   +4 more
doaj   +3 more sources

Produção e qualidade da videira 'Superior Seedless' sob restrição hídrica na fase de maturação Production and quality of 'Superior Seedless' grapes under irrigation restrictions during berry maturation

Pesquisa Agropecuária Brasileira, 2009
O objetivo deste trabalho foi avaliar o efeito das condições de deficit hídrico, na fase de maturação da uva, sobre a produção e qualidade da uva 'Superior Seedless' entre julho e novembro de 2007. O experimento foi realizado em delineamento de blocos ao
Lígia Borges Marinho, José Julio Vilar Rodrigues, José Monteiro Soares, Maria Auxiliadora Coelho de Lima, Magna Soelma Beserra de Moura, Elieth Oliveira Brandão, Thieres George Freire da Silva, Marcelo Calgaro   +7 more
doaj   +1 more source

Example of an iterative approach conducted with smallholders in Northern Laos for the adoption of direct seeding mulch-based cropping systems [PDF]

, 2005
Since the 1990s, in the southern districts of Xayabury province in the Mekong corridor, traditional farming systems have changed through extensive agricultural development based on cash-crop production.
Chantharath, Bounsay, Chantip, Piane, Julien, Patrick, Khamxaykhay, Chanthasone, Séguy, Lucien, Tivet, Florent, Tran Quoc, Hoa   +6 more
core  

Computer Control of on-off Electrothermal Processes

Measurement and Control, 1973
A control scheme is described for improving the performance characteristics of an on/off electrothermal process by means of a model of the process. A /though the process itself operates on open loop, the switching sequence is closely controlled by the operation of a closed loop incorporating the model and the process controller.
J. L. Murgatroyd, D. Goodman
openaire   +2 more sources