Science

GEOCHEMISTRY

The third bank of the river

Organic matter transported by the Amazon reaches the Caribbean

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Microbiology

United they are strong

How Xylella fastidiosa bacteria assemble into biofilms

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GENOMICS

An orderly swarm

DNA sequencing of bees helps to decipher how these insects develop

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Neuroscience

Why so many curves?

Folds of the brain’s surface are not related to the number of neurons

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MEDICINE

The new faces of cancer

Cases of head and neck tumors caused by HPV has increased

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ZOOLOGY

A zoo among the feathers

Birds are hosts to a wide variety of mites, most of them unknown

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OCEANOGRAPHY

Thinner and more fragile

One shelf in western Antarctica may disappear by the end of the decade

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PHYSICS

Less energy loss

International group produces graphene and phosphorene transistor

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Astronomy

An enigma in the Milky Way

Team identifies young stars with the chemical composition of old ones

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TISSUE ENGINEERING

Made-to-measure organs

Stem cells aid in producing trachea and blood vessels

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MENTAL HEALTH

A long maturation period

RMf images reveal stages of development in the brain’s networks

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Cover

A villain with many faces

Fighting dengue requires a combination of strategies

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PHYSICS

How to train nanotubes

Random networks of carbon cylinders perform mathematical operations

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IMMUNOLOGY

Inner battle

Altered gene triggers autoimmune disease in unborn babies

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Ethology

Wings of strife

Male damselflies evaluate own strength in confrontation

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BIOCHEMISTRY

Lethal Contact

Structure allows bacterium to release toxic compounds into rivals

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ECOLOGY

Great gardeners

Animals now extinct played a role in seed dispersal in the Pantanal

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ENVIRONMENT

Fragile land

Satellite images indicate area loss in the Cerrado and the Caatinga

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GEOLOGY

Heading northwest

Part of the Earth’s crust is moving a few millimeters each year

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Astronomy

The view from the periphery

Surveys identify dwarf galaxies in far reaches of the Milky Way

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BIOCHEMISTRY

In times of stress

A plant used in tequila production feeds on bacteria that live within it

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Evolution

Theory under construction

Natural selection creates groups of traits that vary in unison

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NEUROSCIENCE

What our memories retain

New connections form between brain cells during REM sleep

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Melatonin

Unprotected against Alzheimer’s

Inflammation inhibits production of melatonin, that prevents cell death

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Physiology

A connection between sleep and hunger

Melatonin regulates food intake and fat accumulation

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Genetics

Attack in the Dark of Night

Fragments formed hours after sun exposure may damage DNA

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ECOLOGY

Living in freedom

Agoutis raised in captivity are adapting to forest life and breeding

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BOTANY

Underground strategies

Root specializations enable plants to live in impoverished environments

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OBITUARY

Passion for physics and photography

Alejandro Szanto Toledo trained a generation of nuclear physicists in Brazil

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Planetary Cartography

Electronic view

Mathematics aids crater and whirlwind identification on Mercury and Mars

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