Feed aggregator

Astronauts travelling to the moon and Mars risk dying from superbugs

Genetically modified organisms (GMO) - вт, 2019-01-15 13:17
Just trace amounts of antibiotics in a spacecraft could be enough to let bacteria evolve deadly resistance on long space journeys
Категории: Science and society

First moon plants sprout in China's Chang'e 4 biosphere experiment

Genetics - вт, 2019-01-15 12:57
China's space agency has released images of cotton plants sprouting inside the Chang'e 4 moon lander's mini biosphere, the first plant to germinate on another world
Категории: Biology

First moon plants sprout in China's Chang'e 4 biosphere experiment

HIV and AIDS - вт, 2019-01-15 12:57
China's space agency has released images of cotton plants sprouting inside the Chang'e 4 moon lander's mini biosphere, the first plant to germinate on another world
Категории: Healthcare, Science and society

First moon plants sprout in China's Chang'e 4 biosphere experiment

Genetically modified organisms (GMO) - вт, 2019-01-15 12:57
China's space agency has released images of cotton plants sprouting inside the Chang'e 4 moon lander's mini biosphere, the first plant to germinate on another world
Категории: Science and society

No-deal Brexit could lead to drug shortages and delayed operations

Genetics - вт, 2019-01-15 12:46
Amid huge Brexit uncertainty, a range of emergency measures are being put in place to protect medical supplies – but no one knows if these will be enough
Категории: Biology

No-deal Brexit could lead to drug shortages and delayed operations

HIV and AIDS - вт, 2019-01-15 12:46
Amid huge Brexit uncertainty, a range of emergency measures are being put in place to protect medical supplies – but no one knows if these will be enough
Категории: Healthcare, Science and society

No-deal Brexit could lead to drug shortages and delayed operations

Genetically modified organisms (GMO) - вт, 2019-01-15 12:46
Amid huge Brexit uncertainty, a range of emergency measures are being put in place to protect medical supplies – but no one knows if these will be enough
Категории: Science and society

The brown algal mode of tip growth: Keeping stress under control

PLOS Biology (new articles) - вт, 2019-01-15 00:00

by Hervé Rabillé, Bernard Billoud, Benoit Tesson, Sophie Le Panse, Élodie Rolland, Bénédicte Charrier

Tip growth has been studied in pollen tubes, root hairs, and fungal and oomycete hyphae and is the most widely distributed unidirectional growth process on the planet. It ensures spatial colonization, nutrient predation, fertilization, and symbiosis with growth speeds of up to 800 μm h−1. Although turgor-driven growth is intuitively conceivable, a closer examination of the physical processes at work in tip growth raises a paradox: growth occurs where biophysical forces are low, because of the increase in curvature in the tip. All tip-growing cells studied so far rely on the modulation of cell wall extensibility via the polarized excretion of cell wall–loosening compounds at the tip. Here, we used a series of quantitative measurements at the cellular level and a biophysical simulation approach to show that the brown alga Ectocarpus has an original tip-growth mechanism. In this alga, the establishment of a steep gradient in cell wall thickness can compensate for the variation in tip curvature, thereby modulating wall stress within the tip cell. Bootstrap analyses support the robustness of the process, and experiments with fluorescence recovery after photobleaching (FRAP) confirmed the active vesicle trafficking in the shanks of the apical cell, as inferred from the model. In response to auxin, biophysical measurements change in agreement with the model. Although we cannot strictly exclude the involvement of a gradient in mechanical properties in Ectocarpus morphogenesis, the viscoplastic model of cell wall mechanics strongly suggests that brown algae have evolved an alternative strategy of tip growth. This strategy is largely based on the control of cell wall thickness rather than fluctuations in cell wall mechanical properties.
Категории: Biology, Journals

Brain-reading headsets trialled on 10,000 schoolchildren in China

Genetics - пн, 2019-01-14 20:17
Thousands of schoolchildren in China have trialled a brain-scanning headband that lets teachers see if they stop paying attention in class
Категории: Biology

Brain-reading headsets trialled on 10,000 schoolchildren in China

HIV and AIDS - пн, 2019-01-14 20:17
Thousands of schoolchildren in China have trialled a brain-scanning headband that lets teachers see if they stop paying attention in class
Категории: Healthcare, Science and society

Brain-reading headsets trialled on 10,000 schoolchildren in China

Genetically modified organisms (GMO) - пн, 2019-01-14 20:17
Thousands of schoolchildren in China have trialled a brain-scanning headband that lets teachers see if they stop paying attention in class
Категории: Science and society

Teachers are scanning students' brains to check they are concentrating

Genetics - пн, 2019-01-14 20:17
Thousands of school children in China have trialled a brain-scanning headband that lets teachers see if they stop paying attention in class
Категории: Biology

Teachers are scanning students' brains to check they are concentrating

HIV and AIDS - пн, 2019-01-14 20:17
Thousands of school children in China have trialled a brain-scanning headband that lets teachers see if they stop paying attention in class
Категории: Healthcare, Science and society

Teachers are scanning students' brains to check they are concentrating

Genetically modified organisms (GMO) - пн, 2019-01-14 20:17
Thousands of school children in China have trialled a brain-scanning headband that lets teachers see if they stop paying attention in class
Категории: Science and society

Rich people's gardens are better for bees and other pollinators

Genetics - пн, 2019-01-14 19:36
Gardens in wealthier areas have more pollinating insects, such as bees. This could be because gardens in richer areas tend to have a wider range of flowers
Категории: Biology

Rich people's gardens are better for bees and other pollinators

HIV and AIDS - пн, 2019-01-14 19:36
Gardens in wealthier areas have more pollinating insects, such as bees. This could be because gardens in richer areas tend to have a wider range of flowers
Категории: Healthcare, Science and society

Rich people's gardens are better for bees and other pollinators

Genetically modified organisms (GMO) - пн, 2019-01-14 19:36
Gardens in wealthier areas have more pollinating insects, such as bees. This could be because gardens in richer areas tend to have a wider range of flowers
Категории: Science and society

Wellness gurus' health tips: which to adopt and which to ignore

Genetics - пн, 2019-01-14 19:19
The daily routines of four wellness obsessives profiled in The Times included some habits backed up by evidence - and some that definitely aren't
Категории: Biology

Wellness gurus' health tips: which to adopt and which to ignore

HIV and AIDS - пн, 2019-01-14 19:19
The daily routines of four wellness obsessives profiled in The Times included some habits backed up by evidence - and some that definitely aren't
Категории: Healthcare, Science and society

Wellness gurus' health tips: which to adopt and which to ignore

Genetically modified organisms (GMO) - пн, 2019-01-14 19:19
The daily routines of four wellness obsessives profiled in The Times included some habits backed up by evidence - and some that definitely aren't
Категории: Science and society