Источник
Proceedings of the National Academy of Sciences RSS feed -- current issue
Выбор редакции
10 декабря, 20:41

In This Issue [This Week in PNAS]

  • 0

Circulation and feeding in blue whales Tagged blue whale surfaces off the coast of California in Monterey Bay. Image courtesy of the Duke Marine Robotics and Remote Sensing Lab. Examining the biology of animals at the extremes of body size can reveal the effect of size on physiological function. Blue...

Выбор редакции
10 декабря, 20:41

Water limitations to large-scale desert agroforestry projects for carbon sequestration [Physical Sciences]

  • 0

Vegetation and soils take up 20% of global anthropogenic greenhouse gas emission (1), and vegetation also plays an active role in regulating global water cycle (2). In PNAS, Branch and Wulfmeyer (3) conduct a detailed regional-scale simulation to show that agroforestry can significantly enhance rainfall in some desert regions and...

Выбор редакции
10 декабря, 20:41

Reply to Wang and D’Odorico: On the sustainability of large-scale desert plantations as a partial solution for climate change [Physical Sciences]

  • 0

We thank Wang and D’Odorico for their letter (1), ”Water limitations to large-scale desert agroforestry projects for carbon sequestration.” We agree entirely that water resources are vital for the sustainability of desert plantations. However, the focus of this work (2) is not water quantities per se, but the rainfall enhancement...

Выбор редакции
10 декабря, 20:41

Focus on an island rule may hide morphological disparity in insular plants [Biological Sciences]

  • 0

The island rule (1, 2) posits that large mainland species evolve to be small on islands, while small mainland species evolve to be large. Biddick et al. (3) assess the signal of an island rule in plant traits on islands off the coast of New Zealand, concluding that some plant...

Выбор редакции
10 декабря, 20:41

Reply to Brian and Walker-Hale: Support for the island rule does not hide morphological disparity in insular plants [Biological Sciences]

  • 0

We would like to thank Brian and Walker-Hale (1) for their insightful comments on our paper (2). Their ideas prompt us to think differently and more deeply about morphological variability in island plants. However, we would like to reconcile their reservations about the variability that is inherent in morphometric data...

Выбор редакции
10 декабря, 20:41

Demographic change, political backlash, and challenges in the study of geography [Political Sciences]

  • 0

Hill et al.’s study (1) of the relationship between Hispanic population growth and voters’ support for Donald Trump contributes to our understanding of the larger puzzle of diversity and politics. The relationship between diversity and reactionary politics should be considered one of the most important sociopolitical issues facing the world...

Выбор редакции
10 декабря, 20:41

Shining light on dark matter in the genome [Genetics]

  • 0

The complexity of multicellular organisms requires the genome to be transcribed in a cell-type–dependent manner that is responsive to signals, such as hormones, from the internal environment. This is mediated by the epigenome, which decorates and organizes the genome in a web of modified histone proteins functioning in nucleosomes and...

Выбор редакции
10 декабря, 20:41

Remyelination and the gut-brain axis [Neuroscience]

  • 0

Multiple sclerosis (MS) is a neuroinflammatory disease of the central nervous system (CNS) that affects over 2.5 million people worldwide. Most patients develop a relapsing−remitting disease in their second or third decade, although some have a progressive disease from onset. Many of those with relapsing−remitting disease eventually progress into a...

Выбор редакции
10 декабря, 20:41

Drastic enhancement of crystal nucleation in a molecular liquid by its liquid-liquid transition [Applied Physical Sciences]

  • 0

Crystallization is one of the most familiar and fundamental phase transition phenomena. There is a possibility that crystallization may be enhanced by critical-like fluctuations associated with another nearby phase transition if the order parameter of the former is coupled to that of the latter; however, the mechanism of such order...

Выбор редакции
10 декабря, 20:41

Chromosome disentanglement driven via optimal compaction of loop-extruded brush structures [Biophysics and Computational Biology]

  • 0

Eukaryote cell division features a chromosome compaction–decompaction cycle that is synchronized with their physical and topological segregation. It has been proposed that lengthwise compaction of chromatin into mitotic chromosomes via loop extrusion underlies the compaction-segregation/resolution process. We analyze this disentanglement scheme via considering the chromosome to be a succession of...

Выбор редакции
10 декабря, 20:41

Atmospheric modeling and source reconstruction of radioactive ruthenium from an undeclared major release in 2017 [Earth, Atmospheric, and Planetary Sciences]

  • 0

In October 2017 unusual 106Ru detections across most of Europe prompted the Institut de Radioprotection et de Sûreté Nucléaire (IRSN) to analyze the event in order to locate the origin and identify the magnitude of the release. This paper presents the inverse modeling techniques used during the event to achieve...

Выбор редакции
10 декабря, 20:41

The extracellular DNA lattice of bacterial biofilms is structurally related to Holliday junction recombination intermediates [Biochemistry]

  • 0

Extracellular DNA (eDNA) is a critical component of the extracellular matrix of bacterial biofilms that protects the resident bacteria from environmental hazards, which includes imparting significantly greater resistance to antibiotics and host immune effectors. eDNA is organized into a lattice-like structure, stabilized by the DNABII family of proteins, known to...