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2021 In Science
This is a list of several significant scientific events that occurred or were scheduled to occur in 2021. Events January February March April May June July *1 July **Construction begins on the Square Kilometre Array, with first light planned for 2027. **In the debate about the cognitive impacts of smartphones and digital technology a group reports that, contrary to widespread belief, scientific evidence doesn't show that these technologies harm biological cognitive abilities and that they instead only change predominant ways of cognition – such as a reduced need to remember facts or conduct mathematical calculations by pen and paper outside contemporary schools. However, some activities – like reading novels – that require long attention spans and don't feature ongoing rewarding stimulation may become more challenging in general. **A study finds that ~9.4% of global deaths between 2000 and 2019 – ~5 million annually – can be attributed to extreme tempe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2021 In Science - Collage V1
1 (one, unit, unity) is a number representing a single or the only entity. 1 is also a numerical digit and represents a single unit (measurement), unit of counting or measurement. For example, a line segment of ''unit length'' is a line segment of length 1. In conventions of sign where zero is considered neither positive nor negative, 1 is the first and smallest Positive number, positive integer. It is also sometimes considered the first of the sequence (mathematics), infinite sequence of natural numbers, followed by 2, although by other definitions 1 is the second natural number, following 0. The fundamental mathematical property of 1 is to be a multiplicative identity, meaning that any number multiplied by 1 equals the same number. Most if not all properties of 1 can be deduced from this. In advanced mathematics, a multiplicative identity is often denoted 1, even if it is not a number. 1 is by convention not considered a prime number; this was not universally ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Export
An export in international trade is a good produced in one country that is sold into another country or a service provided in one country for a national or resident of another country. The seller of such goods or the service provider is an ''exporter''; the foreign buyer is an '' importer''. Services that figure in international trade include financial, accounting and other professional services, tourism, education as well as intellectual property rights. Exportation of goods often requires the involvement of customs authorities. Firms Many manufacturing firms begin their global expansion as exporters and only later switch to another mode for serving a foreign market. Barriers There are four main types of export barriers: motivational, informational, operational/resource-based, and knowledge. Trade barriers are laws, regulations, policy, or practices that protect domestically made products from foreign competition. While restrictive business practices sometimes hav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human Nutrition
Human nutrition deals with the provision of essential nutrients in food that are necessary to support human life and good health. Poor nutrition is a chronic problem often linked to poverty, food security, or a poor understanding of nutritional requirements.Progress for Children: A Report Card on Nutrition (No. 4), UNICEF, May 2006, www.ventes.le-vel.ca /nutrition/index_33685.html Malnutrition and its consequences are large contributors to deaths, physical deformities, and disabilities worldwide.World Health Organization. (2013). Essential Nutrition Actions: www.ventes.le-vel.ca. Improving maternal, newborn, infant and young child health and nutrition. Washington, DC: WHO/ref> Good nutrition is necessary for children to grow physically and mentally, and for normal human biological development. Overview The human body contains chemical compounds such as water, carbohydrates, amino acids (found in proteins), fatty acids (found in lipids), and nucleic acids ( DNA and RNA). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nature Ecology & Evolution
''Nature Ecology and Evolution'' is an online-only monthly peer-reviewed scientific journal published by Nature Publishing Group covering all aspects of research on ecology and evolutionary biology. It was established in 2017. Its first and current editor-in-chief is Patrick Goymer. According to the ''Journal Citation Reports'', ''Nature Ecology and Evolution'' has a 2020 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as i ... of 15.46. References External links * Nature Research academic journals Publications established in 2017 Ecology journals Monthly journals English-language journals {{ecology-journal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ScienceAlert
ScienceAlert is an independently run online publication and news source that publishes articles featuring scientific research, discoveries and outcomes. The site was founded in 2004 by Julian Cribb, a science writer, to aggregate research findings from Australian universities, and expanded in 2006 when ex-Microsoft programmer Chris Cassella took on the project of developing the website. It has readership that ranges from 11.5m to 26.5m per month. Science journalist Fiona MacDonald has been CEO since 2017. History Science communicator Julian Cribb founded ScienceAlert in 2004. The website was borne of his “concern at the lack of information available about what Australians and New Zealanders achieve in science.” Chris Cassella, a former programmer for Microsoft, joined the site in order to develop new webtools. He took on this work as part of a Master’s thesis in Science Communication at Australia National University, where Cribb was a professor. Initially, ScienceAlert’ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neanderthal
Neanderthals (, also ''Homo neanderthalensis'' and erroneously ''Homo sapiens neanderthalensis''), also written as Neandertals, are an extinct species or subspecies of archaic humans who lived in Eurasia until about 40,000 years ago. While the "causes of Neanderthal disappearance about 40,000 years ago remain highly contested," demographic factors such as small population size, inbreeding and genetic drift, are considered probable factors. Other scholars have proposed competitive replacement, assimilation into the modern human genome (bred into extinction), great climatic change, disease, or a combination of these factors. It is unclear when the line of Neanderthals split from that of modern humans; studies have produced various intervals ranging from 315,000 to more than 800,000 years ago. The date of divergence of Neanderthals from their ancestor ''H. heidelbergensis'' is also unclear. The oldest potential Neanderthal bones date to 430,000 years ago, but the classification ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Art Of The Upper Paleolithic
The art of the Upper Paleolithic represents the oldest form of prehistoric art. Figurative art is present in Europe and Southeast Asia, beginning between about 40,000 to 35,000 years ago. Non-figurative cave paintings, consisting of hand stencils and simple geometric shapes, are somewhat older, at least 40,000 years old, and possibly as old as 64,000 years. This latter estimate is due to a controversial 2018 study based on uranium-thorium dating, which would imply Neanderthal authorship and qualify as art of the Middle Paleolithic. "we present dating results for three sites in Spain that show that cave art emerged in Iberia substantially earlier than previously thought. Uranium-thorium (U-Th) dates on carbonate crusts overlying paintings provide minimum ages for a red linear motif in La Pasiega (Cantabria), a hand stencil in Maltravieso (Extremadura), and red-painted speleothems in Ardales (Andalucía). Collectively, these results show that cave art in Iberia is older than ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bone Carving
Grazing caribou made in Alaska 1910 - Linden Museum Bone carving is creating art, tools, and other goods by carving animal bones, antlers, and horns. It can result in the ornamentation of a bone by engraving, painting or another technique, or the creation of a distinct formed object. Bone carving has been practiced by a variety of world cultures, sometimes as a cheaper, and recently a legal, substitute for ivory carving. As a material it is inferior to ivory in terms of hardness, and so the fine detail that is possible, and lacks the "lustrous" surface of ivory. The interior of bones are softer and even less capable of a fine finish, so most uses are as thin plaques, rather than sculpture in the round. But it must always have been much easier to obtain. It was important in prehistoric art, with notable figures like the '' Swimming Reindeer'', made of antler, and many of the Venus figurines. The Anglo-Saxon Franks Casket is a whale bone casket imitating earlier ivory ones ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exome
The exome is composed of all of the exons within the genome, the sequences which, when transcribed, remain within the mature RNA after introns are removed by RNA splicing. This includes untranslated regions of messenger RNA (mRNA), and coding regions. Exome sequencing has proven to be an efficient method of determining the genetic basis of more than two dozen Mendelian or single gene disorders. Statistics The human exome consists of roughly 233,785 exons, about 80% of which are less than 200 base pairs in length, constituting a total of about 1.1% of the total genome, or about 30 megabases of DNA. Though composing a very small fraction of the genome, mutations in the exome are thought to harbor 85% of mutations that have a large effect on disease. Definition It is important to note that the exome is distinct from the transcriptome, which is all of the transcribed RNA within a cell type. While the exome is constant from cell-type to cell-type, the transcriptome changes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Obesity
Obesity is a medical condition, sometimes considered a disease, in which excess body fat has accumulated to such an extent that it may negatively affect health. People are classified as obese when their body mass index (BMI)—a person's weight divided by the square of the person's height—is over ; the range is defined as overweight. Some East Asian countries use lower values to calculate obesity. Obesity is a major cause of disability and is correlated with various diseases and conditions, particularly cardiovascular diseases, type 2 diabetes, obstructive sleep apnea, certain types of cancer, and osteoarthritis. Obesity has individual, socioeconomic, and environmental causes. Some known causes are diet, physical activity, automation, urbanization, genetic susceptibility, medications, mental disorders, economic policies, endocrine disorders, and exposure to endocrine-disrupting chemicals. While a majority of obese individuals at any given time are attempting to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genetics Of Obesity
Like many other medical conditions, obesity is the result of an interplay between environmental and genetic factors. Studies have identified variants in several genes that may contribute to weight gain and body fat distribution; although, only in a few cases are genes the primary cause of obesity. Polymorphisms in various genes controlling appetite and metabolism predispose to obesity under certain dietary conditions. The percentage of obesity that can be attributed to genetics varies widely, depending on the population examined, from 6% to 85%, with the typical estimate at 50%. It is likely that in each person a number of genes contribute to the likelihood of developing obesity in small part, with each gene increasing or decreasing the odds marginally, and together determining how an individual responds to the environmental factors. As of 2006, more than 41 sites on the human genome have been linked to the development of obesity when a favorable environment is present. Some o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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