Results 71 to 80 of about 3,880,745 (248)

Smart Bioinspired Material‐Based Actuators: Current Challenges and Prospects

open access: yesAdvanced Intelligent Systems, Volume 7, Issue 3, March 2025.
This work gathers, in a review style, an extensive and comprehensive literature overview on the development of autonomous actuators based on synthetic materials, bringing together valuable knowledge from several studies. Furthermore, the article identifies the fundamental principles of actuation mechanisms and defines key parameters to address the size
Alejandro Palacios   +4 more
wiley   +1 more source

Seeds of change: The impact of Ethiopia's direct seed marketing approach on smallholders' seed purchases and productivity

open access: yesAmerican Journal of Agricultural Economics, EarlyView.
Abstract While multiple factors explain low adoption rates of improved varieties by small‐scale farmers in sub‐Saharan Africa, a key supply‐side constraint is the limited availability of seed embodying new traits in the volume, quality, price, and timeliness required by farmers. This constraint is partly attributable to classical failures in the market
Dawit Mekonnen   +5 more
wiley   +1 more source

Climate change and perennial crop production: Evidence of yield impact and adaptation in California

open access: yesAmerican Journal of Agricultural Economics, EarlyView.
Abstract Perennial crops are economically important. They contribute to food security, providing essential nutrients that are often lacking in annual crops, and provide additional environmental benefits compared with annual crops. Despite their importance, empirical research on the impacts of climate change and adaptation on perennial crops remains ...
Yuanyuan Wen   +2 more
wiley   +1 more source

Studies on the pollination biology and breeding systems of some genera with sympatric species in the Brazilian cerrados [PDF]

open access: yes, 2012
Flowering phenology, floral strategies pollinator activity and breeding system were investigated in 14 species of the cerrado vegetation in Braeflia (DF), from April 1985 to April 1986 in Tabebuia caraiba (Mart.) Bur., T.
Barros, Mariluza Araujo Granja e.
core   +2 more sources

Studies on self- and cross-pollination of olives under varying temperature conditions

open access: yesCalifornia Agriculture, 1961
Investigations with Ascolano, Manzanillo, and Sevillano olive varieties show that chances of fertilization and fruit set are much greater after cross-pollination than after self-pollination.
M Bradle, W Griggs, H Hartmann
doaj  

High‐elevation endemic plants predicted to lose habitat from changing climate in Washington State

open access: yesAmerican Journal of Botany, EarlyView.
Abstract Premise High‐elevation plants face unique challenges from potential climate change impacts that will likely require upslope migration into increasingly smaller suitable habitat. This situation is particularly acute for endemic species that by definition occupy small geographic ranges.
Nicholas L. Gjording   +4 more
wiley   +1 more source

Cross family christmas card, 1957 [picture] : "greetings at christmas 1957 From stan and jess cross and stephen" /

open access: yes, 1957
Part of the Stan Cross Archive of cartoons and drawings, 1912-1974.; Copy of original drawing. "Greetings at Christmas 1957 From Stan and Jess Cross and Stephen"; Also available in an electronic version via the internet at: http://nla.gov.au/nla.pic ...
Cross, Stan, 1888-1977.
core   +2 more sources

Pollination by flies, bees, and beetles of Nuphar ozarkana and N. advena (Nymphaeaceae) [PDF]

open access: yes, 2000
Nuphar comprises 13 species of aquatic perennials distributed in the temperate Northern Hemisphere. The European species N. lutea and N. pumila in Norway, the Netherlands, and Germany are pollinated by bees and flies, including apparent Nuphar ...
Lippok, Barbara   +3 more
core   +1 more source

Interactions between maternal provisioning and natural selection on seed mass fluctuate across heat waves

open access: yesAmerican Journal of Botany, EarlyView.
Abstract Premise Changing climates are leading to more frequent and severe heat waves, potentially threatening plant populations. Both acclimation to stress and selection for heat‐escape or heat‐resistance phenotypes occur during heat waves. However, plastic responses and selection do not necessarily interact cohesively—even producing trait responses ...
Lana F. Gaspard   +4 more
wiley   +1 more source

Oil collecting bees and Byrsonima cydoniifolia A. Juss. (Malpighiaceae) interactions: the prevalence of long-distance cross pollination driving reproductive success

open access: yesAnais da Academia Brasileira de Ciências, 2014
Oil-collecting bees are the natural pollinators of oil-flower plants, but little is known about the pollination process and the effectiveness of their pollination service to the reproductive success of their host plants.
MORGANA S. SAZAN   +2 more
doaj   +1 more source

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