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CHEMISTRY

Hydrogel pellets remove water from biodiesel

Reusable material emerges as an alternative for purifying biofuel

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BIOTECHNOLOGY

Scientists develop serum for Africanized bee venom

Scientists develop serum for Africanized bee venom

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GEOLOGY

Extinct rivers of the Northeast

Sedimentary rock layers indicate that waters descended from mountains in the region some 450 million years ago

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PALEONTOLOGY

Biomechanics used to infer how titanosaurs moved

Newly described species lived around 110 million years ago in what may have been the last land bridge between Brazil and Africa

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ARCHAEOGENETICS

Did diseases kill the Neanderthals?

Sequences detected in the genome of the extinct species represent the oldest documented human viral infections

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PUBLIC POLICY

Researchers aim to reduce bat deaths at wind farms

Thousands of animals die each year due to collisions or air pressure changes caused by turbine blades

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BOTANY

Orchids emerged in the Northern Hemisphere 83 million years ago

Plant DNA study suggests modern species have diversified in the tropics in the last five million years, especially in Central America

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MENTAL HEALTH

Messages and home visits help reduce symptoms of depression in the elderly

Strategies were tested on low-income participants with low education levels in the city of Guarulhos

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NEUROLOGY

Elderly capuchin monkeys have lesions typical of Alzheimer’s disease

The finding could allow primates abundant in Brazil to be used as a model for studying the human disease

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CLIMATE CHANGE

Lack of maintenance and design flaws prevented the flood containment system from protecting Porto Alegre

Damage could have been significantly reduced if the system, installed 50 years ago, had worked properly

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ENVIRONMENT

Climate change and El Niño increased the frequency and intensity of rainfall in southern Brazil

Global warming doubled the likelihood of extreme precipitation, like the heavy rains of April/May, and increased the volume of rainfall in Rio Grande do Sul from 6% to 9%

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CLIMATE CHANGE

How sponge cities can help prevent flooding

How sponge cities can help prevent flooding

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DATA

How the pandemic affected the HDI

Data show how the pandemic affected HDI

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GOOD PRACTICES

Detours in the labyrinth of Alzheimer’s disease

Author of Nature article cited more than 2,500 times acknowledges image manipulation and requests retraction

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GOOD PRACTICES

Research animal supplier pays record fine for mistreatment of beagles

Research animal supplier pays record fine for mistreatment of beagles

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GOOD PRACTICES

Retired researcher says open-access agreement is discriminatory

Retired researcher says open-access agreement is discriminatory

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ETHICS

New rules for research involving human beings

New law set to come into force at the end of August will allow trials to be approved by a single body

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SCIENTIFIC COMMUNICATION

Researchers and students help improve Wikipedia entries

At least 35 universities in the country implemented undergraduate and communication projects with the online encyclopedia

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Interview

Eliza Freire: Lizards, snakes, and prejudice

In spaces once occupied exclusively by men, Eliza Freire identified new species and uncovered new knowledge of the diversity of reptiles in Northeast Brazil

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Cover

The challenge of understanding what animals feel

Strategies created to measure pain and try to decipher animals’ emotions

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Cover

Care and empathy for animals

Researchers from various disciplines investigate ways to reduce pain and improve the quality of life for species used or consumed by humans

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Biodiversity

Fewer armadillos and more jaguars in the Pantanal after fires

Giant armadillos in decline and jaguar populations increase after wildfires in the Pantanal

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ECOLOGY

Thousands of plant species live on rocks

Thousands of plant species live on rocks

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Environment

Agreement to reduce pollution by ships

Australia and Singapore sign agreement to reduce carbon dioxide emissions from ships

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Collaboration

African countries demand more equitable partnerships

Scientists from African countries release manifesto demanding more equitable scientific partnerships

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Public health

Anti-HIV medication still poorly distributed

Distribution of preventive HIV medicine concentrated in major cities

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Environment

Alaskan rivers turn orange and acidic

Minerals in the soil alter water color in dozens of Alaskan rivers

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Pharmacology

No-needle blood test

Just for women: new needle-free blood sugar test

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Biochemistry

The chemistry of a teenager’s smell

Hormone residues alter body odor in adolescence

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Paleontology

Marsupial nursery

Large marsupial lived in Itaboraí (Rio de Janeiro) 55 million years ago

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