Gig economy workers say they can no longer survive
Whether in Paris, Kuala Lumpur or California, gig economy workers fear they can no longer survive on meagre earnings from jobs that leave them increasingly vulnerable.
Dec 16, 2020
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Business
Whether in Paris, Kuala Lumpur or California, gig economy workers fear they can no longer survive on meagre earnings from jobs that leave them increasingly vulnerable.
Dec 16, 2020
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American Airlines resumed trying to fill its planes to full capacity Wednesday, abandoning some coronavirus precautions and drawing criticism from public health officials as the pandemic runs wild in parts of America.
Jul 1, 2020
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Business
Amazon is gradually reopening its warehouses in France after working out virus safety measures with unions, in an effort to end weeks of legal troubles that had sharply curtailed the company's French business and drawn worldwide ...
May 19, 2020
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Business
Air France-KLM on Thursday announced a first-quarter loss of 1.8 billion euros and warned of more woe to come as the coronavirus pandemic decimates international travel.
May 7, 2020
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The coronavirus crisis is forcing Ford Motor Co. to burn through cash at an alarming rate, but its chief financial officer says there's enough money to make it through the year —even if U.S. factories aren't restarted.
Apr 29, 2020
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Internet
Amid the global coronavirus pandemic, disinformation about the situation has been spreading at lightning speeds on social media. In the words of Kathleen Carley, a CyLab faculty member and a professor in the School of ...
Mar 26, 2020
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Business
Seven Middle Eastern countries have suspended all commercial flights due to a fast-spreading new virus as the aviation industry's largest trade association announced Thursday that airlines in the region have already lost ...
Mar 19, 2020
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Business
The coronavirus has claimed yet another major tech conference.
Mar 5, 2020
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Business
German airline giant Lufthansa said Wednesday it would ground 150 of its more than 750 planes worldwide, days after announcing a slimmed-down timetable over the effects of the novel coronavirus.
Mar 4, 2020
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Business
Major travel disruptions due to the new coronavirus have already caused the equivalent of a roughly $100 million loss to airlines in the Middle East, which serves as a connection hub for east-west travel, the industry's main ...
Mar 2, 2020
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I: dsDNA viruses II: ssDNA viruses III: dsRNA viruses IV: (+)ssRNA viruses V: (−)ssRNA viruses VI: ssRNA-RT viruses VII: dsDNA-RT viruses
A virus (from the Latin virus meaning toxin or poison) is a microscopic infectious agent that can reproduce only inside a host cell. Viruses infect all types of organisms: from animals and plants, to bacteria and archaea. Since the initial discovery of tobacco mosaic virus by Martinus Beijerinck in 1898, more than 5,000 types of virus have been described in detail, although most types of virus remain undiscovered. Viruses are ubiquitous, as they are found in almost every ecosystem on Earth, and are the most abundant type of biological entity on the planet. The study of viruses is known as virology, and is a branch of microbiology.
Viruses consist of two or three parts: all viruses have genes made from either DNA or RNA, long molecules that carry genetic information; all have a protein coat that protects these genes; and some have an envelope of fat that surrounds them when they are outside a cell. Viruses vary in shape from simple helical and icosahedral shapes, to more complex structures. They are about 1/100th the size of bacteria. The origins of viruses in the evolutionary history of life are unclear: some may have evolved from plasmids—pieces of DNA that can move between cells—while others may have evolved from bacteria. In evolution, viruses are an important means of horizontal gene transfer, which increases genetic diversity.
Viruses spread in many ways; plant viruses are often transmitted from plant to plant by insects that feed on sap, such as aphids, while animal viruses can be carried by blood-sucking insects. These disease-bearing organisms are known as vectors. Influenza viruses are spread by coughing and sneezing, and others such as norovirus, are transmitted by the faecal-oral route, when they contaminate hands, food, or water. Rotaviruses are often spread by direct contact with infected children. HIV is one of several viruses that are transmitted through sexual contact.
Not all viruses cause disease, as many viruses reproduce without causing any obvious harm to the infected organism. Viruses such as hepatitis B can cause life-long or chronic infections, and the viruses continue to replicate in the body despite the hosts' defence mechanisms. In some cases, these chronic infections might be beneficial as they might increase the immune system's response against infection by other pathogens. However, in most cases viral infections in animals cause an immune response that eliminates the infecting virus. These immune responses can also be produced by vaccines that give lifelong immunity to a viral infection. Microorganisms such as bacteria also have defences against viral infection, such as restriction modification systems. Antibiotics have no effect on viruses, but antiviral drugs have been developed to treat both life-threatening and more minor infections.
This text uses material from Wikipedia, licensed under CC BY-SA