Ricardo Zorzetto

Astronomy

Unusual Stars

Researchers puzzled by recent discoveries of stars with variable brightness

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HEALTH

Early-term births on the rise

In 2015, 40% of babies were born before reaching biological maturity, partly because of elective cesarean sections

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Cover

Before memory loss

Psychiatric problems may be the first signs of Alzheimer’s disease

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Astronautics

The private conquest of the Cosmos

A capsule of the company SpaceX flies to the International Space Station and may give the United States the capacity to put humans in orbit

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Evolution

The origin of the butterfly

Studies based on gene and fossil analysis estimate that butterflies emerged between 120 and 100 million years ago

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Physiology

An enemy unknown

Brazilian researchers find that fasting causes growth hormone to activate neurons that induce hunger and undermine weight loss

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Paleontology

The horned crocodile of Acre

New fossil belonged to the 31st known species of a group of reptiles that lived in South America between 23 million and 5 million years ago

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Archaeology

The water people

For 1,000 years, indigenous people in South America lived in stilt-house villages in the lowlands of present-day Maranhão

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Psychiatry

The other side of ayahuasca

Research teams from Natal and Ribeirão Preto conduct initial tests on antidepressant properties of ayahuasca tea made of leaves and bark from the Amazon

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Psychiatry

Battling persistent depression

Studies suggest that low doses of psychedelic anesthetics may be beneficial to people who do not respond to conventional medication

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Astronomy

Unusual Stars

Researchers puzzled by recent discoveries of stars with variable brightness

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Tropical diseases

A center for safeguarding health in the Amazon

Founded in 1936, the Evandro Chagas Institute produces world-leading research on infectious and parasitic diseases and environmental issues

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Interview

Pedro Fernando da Costa Vasconcelos: The return of yellow fever and Zika

Discoverer of more than 100 species of viruses in the Amazon, the virologist from the state of Pará says it's just a matter of time before there are new outbreaks of the two diseases

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Cover

Before memory loss

Psychiatric problems may be the first signs of Alzheimer’s disease

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Amazonia

Brother in the North

Emílio Goeldi Museum of Pará reaches 152nd anniversary with 4.5 million items preserved, but few protected

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Cover

The race for the best light

Sirius will compete with a fourth-generation facility inaugurated in 2016 in Sweden and another planned to begin operating in 2020 in France

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Cover

Leaping towards brilliance

In its final stage of construction, the latest-generation synchrotron light source could elevate the quality of Brazilian research

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HEALTH

Early-term births on the rise

In 2015, 40% of babies were born before reaching biological maturity, partly because of elective cesarean sections

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INTERVIEW

Antonio Sérgio Petrilli: A multifaceted physician

Pediatric oncologist Antonio Sérgio Petrilli describes how he built and now runs one of Brazil’s leading centers for research and treatment of childhood cancer

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Cover

The reasons for the decline in vaccinations

At least nine factors contribute to a reduction in childhood immunization and increase the risk of the reappearance of serious illnesses

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Cover

The race for the best light

Sirius will compete with both a fourth-generation facility inaugurated in 2016 in Sweden, and another planned to begin operating in 2020 in France

By

Cover

Leaping towards brilliance

Now in its final stage of construction, the latest-generation synchrotron light source could elevate the quality of Brazilian research

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GEOSCIENCES

Polarized opinion

Declining strength of Earth's magnetic field fuels debate on the chances of the poles reversing for the first time in 780,000 years

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GEOLOGY

The rain that united two forests

Periods of heavy rainfall between 120,000 and 12,000 years ago may have connected the Atlantic Forest to the Amazon

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OBITUARY

The malaria vaccine pioneer

Ruth Nussenzweig died in New York City at 89 from a pulmonary embolism

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GEOSCIENCES

Scars of a cataclysm in Central Brazil

Rocks found in the states of Mato Grosso, Goiás, and São Paulo reveal earthquake and tsunami caused by a meteorite some 250 million years ago

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COVER

Some effects of manufactured foods

Recent studies stir controversy over the risks of eating processed foods that are high in preservatives, salt, sugar, and fats

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Cover

The mechanisms of aging

Studies of living cells and organisms identify genetic and molecular phenomena associated with physical and mental decline

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ASTROPHYSICS

Fireflies around Saturn

A Brazilian research team proposes a model to explain the origin of a tenuous ring around the second largest planet in the Solar System

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NEUROLOGY

Adolescent depression

Heightened reward-related brain activity may predict an increased risk for developing the disorder

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