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99-627: The Frome River is an ephemeral river in the Australian state of South Australia located within the Lake Eyre basin . Its source is near Mount Rose in the northern Flinders Ranges and it discharges into the south-eastern side of the northern part of Lake Eyre . The river was named by the British explorer, Edward John Eyre on 27 August 1840 after Captain Edward Frome who was

198-437: A waka concerning death. Ephemerality has received increased attention from modern academics, in fields such as: literary studies , art history , book history, digital media studies , performance studies – "and the 'archival turn' in the humanities as a whole". The ephemerality of dance has engendered concern since at least the sixteenth century. Curators of modern and contemporary art have increasingly expressed

297-491: A region is ephemeral. Malaria Malaria is a mosquito-borne infectious disease that affects vertebrates and Anopheles mosquitoes. Human malaria causes symptoms that typically include fever , fatigue , vomiting , and headaches . In severe cases, it can cause jaundice , seizures , coma , or death . Symptoms usually begin 10 to 15 days after being bitten by an infected Anopheles mosquito . If not properly treated, people may have recurrences of

396-575: A blood meal from a previously Plasmodium infected person or animal. Parasites are then typically introduced by the bite of an infected Anopheles mosquito. Some of these inoculated parasites, called " sporozoites ", probably remain in the skin, but others travel in the bloodstream to the liver , where they invade hepatocytes . They grow and divide in the liver for 2–10 days, with each infected hepatocyte eventually harboring up to 40,000 parasites. The infected hepatocytes break down, releasing these invasive Plasmodium cells, called " merozoites ", into

495-462: A child under five died of malaria in 2021, and "many of these deaths are preventable and treatable". Malaria is commonly associated with poverty and has a significant negative effect on economic development. In Africa, it is estimated to result in losses of US$ 12 billion a year due to increased healthcare costs, lost ability to work, and adverse effects on tourism. The term malaria originates from Medieval Italian : mala aria 'bad air',

594-414: A consistent supply of microscopy slides and stains. In places where microscopy is unavailable, malaria is diagnosed with RDTs, rapid antigen tests that detect parasite proteins in a fingerstick blood sample. A variety of RDTs are commercially available, targeting the parasite proteins histidine rich protein 2 (HRP2, detects P. falciparum only), lactate dehydrogenase , or aldolase . The HRP2 test

693-472: A greater likelihood of complications and death. Malaria infection affects the immune responses following vaccination for various diseases. For example, malaria suppresses immune responses to polysaccharide vaccines. A potential solution is to give curative treatment before vaccination in areas where malaria is present. Due to the non-specific nature of malaria symptoms, diagnosis is typically suspected based on symptoms and travel history, then confirmed with

792-586: A hugely successful aggregator of ephemeral media". In 2009, Ian Christie considered that a substantial amount of modern media, aligned with "rapid proliferati[on]", "may prove much more ephemeral than the flip-book ". Wang Tao , Stevens and Rubem Fonseca evoked ephemerality via female characters; Virginia Woolf used the rainbow as a symbol whereas grass occupies a similar role in the Bible; F. Scott Fitzgerald and John Keats elicited melancholic ephemerality in showcases of consumption . Historically,

891-456: A laboratory test showing hemoglobin levels below 8 grams per deciliter of blood. In areas of the world with little to no malaria, the WHO recommends only testing people with possible exposure to malaria (typically travel to a malaria-endemic area) and unexplained fever. In sub-Saharan Africa, testing is low, with only about one in four (28%) of children with a fever receiving medical advice or

990-488: A laboratory test to detect the presence of the parasite in the blood (parasitological test). In areas where malaria is common, the World Health Organization (WHO) recommends clinicians suspect malaria in any person who reports having fevers, or who has a current temperature above 37.5 °C without any other obvious cause. Malaria should be suspected in children with signs of anemia : pale palms or

1089-534: A large amount of sweat on the surface of the skin. Due to the high levels of lactic acid released from the human body, it has been hypothesized to represent a specific human host-recognition cue for anthropophilic (attracted to humans) mosquitoes. Pungent foot odor Most studies use human odors as stimuli to attract host seeking mosquitoes and have reported a strong and significant attractive effect. The studies have found human odor samples very effective in attracting mosquitoes. Foot odors have been demonstrated to have

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1188-636: A less pronounced and almost continuous fever. Symptoms typically begin 10–15 days after the initial mosquito bite, but can occur as late as several months after infection with some P. vivax strains. Travellers taking preventative malaria medications may develop symptoms once they stop taking the drugs. Severe malaria is usually caused by P. falciparum (often referred to as falciparum malaria). Symptoms of falciparum malaria arise 9–30 days after infection. Individuals with cerebral malaria frequently exhibit neurological symptoms, including abnormal posturing , nystagmus , conjugate gaze palsy (failure of

1287-656: A matter of decades. Furthermore, ephemerality can be perceived as defiance of value or durability; common uses of the term indicate a "complicated relationship between temporality and value". Ephemerality is a matter of varying scale and can affect the entire spectrum of literature, from a "finely bound" Bible to a "hastily printed" handbill: "Paper is the medium of permanence and ephemerality at once". Due to them often outlasting their expressed purpose, these objects can be perceived as temporal and ontological oddities; ephemerality has been described as constitutionally liminal. Ephemerality has been seen as indicative of epochs like

1386-435: A non-invasive way to detect malarial infections. In addition, these volatile compounds were heavily detected by mosquito antennae as an attractant, making the children more vulnerable to the bite of the mosquitos. Fatty acids Fatty acids have been identified as an attractive compound for mosquitoes, they are typically found in volatile emissions from the skin. These fatty acids that produce body odor profiles originate from

1485-564: A part of miasma theory ; the disease was formerly called ague or marsh fever due to its association with swamps and marshland. The term appeared in English at least as early as 1768. Malaria was once common in most of Europe and North America, where it is no longer endemic, though imported cases do occur. The scientific study of malaria is called malariology. Adults with malaria tend to experience chills and fever—classically in periodic intense bouts lasting around six hours, followed by

1584-530: A period of sweating and fever relief—as well as headache, fatigue, abdominal discomfort, and muscle pain . Children tend to have more general symptoms: fever, cough, vomiting, and diarrhea. Initial manifestations of the disease—common to all malaria species—are similar to flu-like symptoms , and can resemble other conditions such as sepsis , gastroenteritis , and viral diseases . The presentation may include headache , fever , shivering , joint pain , vomiting , hemolytic anemia , jaundice , hemoglobin in

1683-575: A postdoctoral scholar at the University of California, Berkeley studying the structural basis of membrane manipulation and cell-cell fusion by bacterial pathogens, discusses studies that determine how odor profiles can be used to diagnose the disease. Within the study, samples of volatile compounds from around 400 children within schools in Western Kenya were collected - to identify asymptomatic infections. These biomarkers have been established as

1782-635: A rapid diagnostic test in 2021. There was a 10-percentage point gap in testing between the richest and the poorest children (33% vs 23%). Additionally, a greater proportion of children in Eastern and Southern Africa (36%) were tested than in West and Central Africa (21%). According to UNICEF, 61% of children with a fever were taken for advice or treatment from a health facility or provider in 2021. Disparities are also observed by wealth, with an 18 percentage point difference in care-seeking behaviour between children in

1881-458: A river network is a particularly significant element in the hydrological transmission of waterborne diseases , via a direct and indirect presence in the transmission cycle – the nature of the disease and area covered are important factors as well. Diseases like malaria , dengue fever , chikungunya , zika and schistosomiasis are found in ephemeral waterbodies due to their vectors relation and/or reliance. Examples of ephemeral streams are

1980-490: A seasonal manner. Landscapes feature ephemeral changes of both natural and man-made origin. Furrows , haystacks and sheaves are ephemeral aspects of a landscape. Plants whose life cycle is significantly less than the time of a growing season are deemed ephemeral. Winter annuals , Epilobium and Senecio vulgaris are examples of ephemeral plants. The conditions for ephemeral plants are markedly present in deserts. Animals can be ephemeral, with brine shrimp and

2079-466: A short time, and a "thin film" of blood, allowing them to clearly see individual parasites and identify the infecting Plasmodium species. Under typical field laboratory conditions, a microscopist can detect parasites when there are at least 100 parasites per microliter of blood, which is around the lower range of symptomatic infection. Microscopic diagnosis is relatively resource intensive, requiring trained personnel, specific equipment, electricity, and

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2178-574: A similar interest; curator of said genres Jan Schall described them as varyingly ephemeral. Ephemerality present in digital literature and poetry has seen critical analysis. Russell questioned if scholarly conceptions of "the everyday" was deeply intertwined with ephemerality, despite attention to a relation being thus far faint. Social historians and historians of sound have contended their subject's ephemerality by utilising more material forms; creative soundwork has long been subordinate to these forms on account of its ephemerality. The ephemerality of

2277-595: A small proportion of public expenditure on health. In contrast, a similar programme in Tanzania would cost an estimated one-fifth of the public health budget. In 2021, the World Health Organization confirmed that China has eliminated malaria. In 2023, the World Health Organization confirmed that Azerbaijan , Tajikistan , and Belize have eliminated malaria. In areas where malaria is common, children under five years old often have anaemia , which

2376-514: A social norm that "the discourse will pass and be forgotten as the past". Ephemerality is a technologically and socially reliant concept – relative and historically changing. The rudimentary technology of early radio led to the media broadcast being ephemeral and for a substantial amount of time spoken communication was ephemeral. Written communication, historically and presently, has been influenced by ephemerality. The emergence of new digital media and technology develops what we deem ephemeral, to

2475-404: A status as long being ephemeral, acknowledged by some affected in the then-present. The ubiquity of digital media has spurred the opinion that print material is comparatively less ephemeral. Elisa New and Anna Akhmatova varyingly opined that poetry is a means of repealing mortal ephemerality, with Akhamatova invoking the aphorism ars longa, vita brevis ("skillfulness takes time and life

2574-653: A thoroughly modern experience". Ephemerality was furthermore prominent in the late 20th century, on account of multiple social features; Reiko Tomii described ephemerality as a "defining issue of the 1960s". In the 21st century, ephemerality "continues to signify concerns about the overflow of information, its evanescence, and questions of what or should be preserved". David Harvey defined postmodernism as "a total acceptance of ephemerality". Architecture of an ephemeral nature appears as increasingly commonplace, on account of global and capricious hyper-mobility and mass displacement. Marc Augé observed ephemerality as key to

2673-897: A varied and global occurrence. In northeastern United States , ephemeral freshwater systems are abundant and are "critical to the maintenance of forest biodiversity". Hydroperiod, predation, competition and food availability are among the "highly heterogeneous" elements of these features. In tropical biomes, amphibians often reside in ephemeral habitats during dry seasons; opportunistic species utilise similar and ephemeral habitats for food, sleep or mating. Environments akin to ephemeral ponds can be very significant sites of reproduction for amphibians; many other organism make use of ephemeral ponds, pools and streams to breed. Those which do utilise these sites are significantly constrained by time thus they mature, reproduce or disperse before evaporation. Ephemeral pools lasting only days or weeks are exclusively used for breeding by Fletcher's frog regardless of

2772-518: A way past the net. Insecticide-treated nets (ITNs) are estimated to be twice as effective as untreated nets and offer greater than 70% protection compared with no net. Between 2000 and 2008, the use of ITNs saved the lives of an estimated 250,000 infants in Sub-Saharan Africa. According to UNICEF, only 36% of households had sufficient ITNs for all household members in 2019. In 2000, 1.7 million (1.8%) African children living in areas of

2871-479: Is a feature of blackwater fever , where haemoglobin from lysed red blood cells leaks into the urine. Infection with P. falciparum may result in cerebral malaria, a form of severe malaria that involves encephalopathy . It is associated with retinal whitening, which may be a useful clinical sign in distinguishing malaria from other causes of fever. An enlarged spleen , enlarged liver or both of these , severe headache, low blood sugar , and haemoglobin in

2970-518: Is associated with potentially life-threatening conditions about as often as with a diagnosis of P. falciparum infection. P. vivax proportionally is more common outside Africa. Some cases have been documented of human infections with several species of Plasmodium from higher apes , but except for P. knowlesi —a zoonotic species that causes malaria in macaques —these are mostly of limited public health importance. The Anopheles mosquitos initially get infected by Plasmodium by taking

3069-446: Is caused by six Plasmodium species: P. falciparum , P. malariae , P. ovale curtisi , P. ovale wallikeri , P. vivax and P. knowlesi . Among those infected, P. falciparum is the most common species identified (~75%) followed by P. vivax (~20%). Although P. falciparum traditionally accounts for the majority of deaths, recent evidence suggests that P. vivax malaria

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3168-402: Is contingent. Baudelaire, who considered aesthetics to be centered around an interplay of the perennial and the ephemeral, defined the artistic component of modernity by its ephemeral quality. Sarah Kofman posited that art is utilised to abate the "intolerable nature of all ephemeral things". Ephemerality has been relevant to a considerable amount of art; various artists have drawn upon

3267-465: Is deemed severe when any of the following criteria are present, otherwise it is considered uncomplicated. Cerebral malaria is defined as a severe P. falciparum -malaria presenting with neurological symptoms, including coma (with a Glasgow coma scale less than 11, or a Blantyre coma scale less than 3), or with a coma that lasts longer than 30 minutes after a seizure. Methods used to prevent malaria include medications, mosquito elimination and

3366-531: Is insufficient evidence that mosquito repellents can prevent malaria infection. Insecticide-treated nets (ITNs) and indoor residual spraying (IRS) are effective, have been commonly used to prevent malaria, and their use has contributed significantly to the decrease in malaria in the 21st century. ITNs and IRS may not be sufficient to eliminate the disease, as these interventions depend on how many people use nets, how many gaps in insecticide there are (low coverage areas), if people are not protected when outside of

3465-451: Is not available. In areas where the disease is common, malaria should be confirmed if possible before treatment is started due to concerns of increasing drug resistance . Resistance among the parasites has developed to several antimalarial medications; for example, chloroquine -resistant P. falciparum has spread to most malarial areas, and resistance to artemisinin has become a problem in some parts of Southeast Asia . The disease

3564-400: Is relatively invisible to immune surveillance. However, circulating infected blood cells are destroyed in the spleen . To avoid this fate, the P. falciparum parasite displays adhesive proteins on the surface of the infected blood cells, causing the blood cells to stick to the walls of small blood vessels, thereby sequestering the parasite from passage through the general circulation and

3663-450: Is short"). Ephemeral objects chiefly disappear; when preserved it is often knowingly, having been "rescued from ephemerality", though this practice is still fraught with uncertainty and an object's ephemerality may only be suspended, thus still capable of being transitory. The legacy of ephemerality often manifests as "traces, glimmers, residues, and specks of things". Literature may contest, document or approximate ephemerality although

3762-449: Is sometimes due to malaria. Giving children with anaemia in these areas preventive antimalarial medication improves red blood cell levels slightly but does not affect the risk of death or need for hospitalisation. Vector control refers to methods used to decrease malaria by reducing the levels of transmission by mosquitoes. For individual protection, the most effective insect repellents are based on DEET or picaridin . However, there

3861-408: Is spread exclusively through bites of infected female Anopheles mosquitoes. The mosquito bite introduces the parasites from the mosquito's saliva into a person's blood. The parasites travel to the liver , where they mature and reproduce. Five species of Plasmodium commonly infect humans. The three species associated with more severe cases are P. falciparum (which is responsible for

3960-425: Is typical) to several years. After a period of dormancy, they reactivate and produce merozoites. Hypnozoites are responsible for long incubation and late relapses in P. vivax infections, although their existence in P. ovale is uncertain. The parasite is relatively protected from attack by the body's immune system because for most of its human life cycle it resides within the liver and blood cells and

4059-413: Is typically attributed to treatment failure. People may develop some immunity when exposed to frequent infections. Malaria infection develops via two phases: one that involves the liver (exoerythrocytic phase), and one that involves red blood cells, or erythrocytes (erythrocytic phase). When an infected mosquito pierces a person's skin to take a blood meal, sporozoites in the mosquito's saliva enter

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4158-818: Is widely used in Africa, where P. falciparum predominates. However, since HRP2 persists in the blood for up to five weeks after an infection is treated, an HRP2 test sometimes cannot distinguish whether someone currently has malaria or previously had it. Additionally, some P. falciparum parasites in the Amazon region lack the HRP2 gene, complicating detection. RDTs are fast and easily deployed to places without full diagnostic laboratories. However they give considerably less information than microscopy, and sometimes vary in quality from producer to producer and lot to lot. Serological tests to detect antibodies against Plasmodium from

4257-567: Is widespread in the tropical and subtropical regions that exist in a broad band around the equator . This includes much of sub-Saharan Africa , Asia , and Latin America . In 2022, some 249 million cases of malaria worldwide resulted in an estimated 608,000 deaths, with 80 percent being five years old or less. Around 95% of the cases and deaths occurred in sub-Saharan Africa. Rates of disease decreased from 2010 to 2014, but increased from 2015 to 2021. According to UNICEF, nearly every minute,

4356-1346: The Luni river in Rajasthan , India , Ugab River in Southern Africa , and a number of small ephemeral watercourses that drain Talak in northern Niger . Other notable ephemeral rivers include the Todd River and Sandover River in Central Australia as well as the Son River , Batha River , and the Trabancos River . Any endorheic basin , or closed basin, that contains a playa (dry lake) at its drainage lowpoint can become an ephemeral lake. Examples include Lake Carnegie in Western Australia , Lake Cowal in New South Wales , Mystic Lake and Rogers Lake in California, and Sevier Lake in Utah . Even

4455-589: The Surveyor General of South Australia at the time. This South Australia geography article is a stub . You can help Misplaced Pages by expanding it . Ephemeral An ephemeral stream is that which only exists following precipitation . They are not the same as intermittent or seasonal waterbodies, which exist for longer periods, but not all year round. Ephemeral streams can be difficult to "conceptually defin[e]"; those that are discontinuous, due to altering between aggradation or degradation, have

4554-411: The bone marrow for 11 days, then return to the blood circulation to await uptake by the bite of another mosquito. Once inside a mosquito, the gametocytes undergo sexual reproduction, and eventually form daughter sporozoites that migrate to the mosquito's salivary glands to be injected into a new host when the mosquito bites. The liver infection causes no symptoms; all symptoms of malaria result from

4653-499: The human condition , a phenomenon of physicality. A significant amount of living is ephemeral, considered by some as a component of everyday life: "we might best understand the ephemeral as a routine and constant force... that establishes the presence of the everyday". Ephemeral aspects are evident in communication, of both digitial and physical origin. In the digital realm, online interactions straddle permanency and ephemerality, new posts proliferate such that participants adopt

4752-416: The mayfly being examples. The placenta is considered an ephemeral organ present during gestation and pregnancy . Ephemerality is a component of olfaction , breathing, speech and memory, aligned with permanency in the latter. With regards to witnessing an artwork in a museum, limited research indicates that the ephemerality of solely gazing at the artwork results in greater remembrance compared to

4851-491: The polymerase chain reaction to detect the parasite's DNA have been developed, but they are not widely used in areas where malaria is common, due to their cost and complexity. The risk of disease can be reduced by preventing mosquito bites through the use of mosquito nets and insect repellents or with mosquito-control measures such as spraying insecticides and draining standing water . Several medications are available to prevent malaria for travellers in areas where

4950-401: The "touch of those who would erase queer possibility". Freud considered culture as the prevailing element exempt from ephemerality. Scheibe saw the likes of live theater, travel abroad, stand-up comedy, and political pundits as engendering greater ephemerality by reducing attention spans and sense of personal history. Karl Marx and Friedrich Engels ' perception of ephemerality "represents

5049-408: The 21st century—the advent of the telegraph , camera , and film projector instilled an understanding of ephemeral media. Scholars such as Charles Baudelaire , Georg Simmel , and Walter Benjamin saw the distinctly and intentionally ephemeral practice of fashion as emblematic of modernity. Scholars have described ephemerality as affixed to the present , a present that is ephemeral insofar as it

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5148-516: The High Castle and The Plot Against America depict Americana and the nation itself as ephemeral. Ephemerality has been central to Buddhism; Yogācāra teaches a version of ontology that centers around universal ephemerality . Ephemerality has been identified as relevant to queer cultures ; José Esteban Muñoz argued that queerness and ephemerality are intertwined, as the former has been expressed in methods which are prone to fade upon

5247-659: The Printing Revolution, a greater expansion thereof, the Baroque era, the Victorian era , the Georgian era , modernity , or the "emergent post-print age". The likes of food, clothes, novels, zines , illnesses, breath, regimes, persons, glass, ash and ephemera have been said to illustrate and/or be affected by ephemerality. The new media of the 20th century conditioned perceptions of ephemerality in

5346-405: The absence of Duffy antigens on red blood cells. The impact of sickle cell trait on malaria immunity illustrates some evolutionary trade-offs that have occurred because of endemic malaria. Sickle cell trait causes a change in the haemoglobin molecule in the blood. Normally, red blood cells have a very flexible, biconcave shape that allows them to move through narrow capillaries ; however, when

5445-540: The appearance of continual change. Furthermore, the characteristics of terrain and rainfall are profound in affecting ephemeral streams. Ephemeral waterbodies experience formative change upon the end of a hydroperiod. "Due to lack of continuous hydrology data, the designation of sites as ephemeral or intermittent is necessarily tenuous". Ephemeral streams feature a low degree of hydrological connectivity. Small wetlands are often ephemeral and ephemeral ecosystems are often aquatic; ephemeral wetlands , streams and ponds are

5544-418: The blood have been developed, but are not used for malaria diagnosis due to their relatively poor sensitivity and specificity. Highly sensitive nucleic acid amplification tests have been developed, but are not used clinically due to their relatively high cost, and poor specificity for active infections. Malaria is classified into either "severe" or "uncomplicated" by the World Health Organization (WHO). It

5643-430: The bloodstream and migrate to the liver where they infect hepatocytes, multiplying asexually and asymptomatically for a period of 8–30 days. After a potential dormant period in the liver, these organisms differentiate to yield thousands of merozoites, which, following rupture of their host cells, escape into the blood and infect red blood cells to begin the erythrocytic stage of the life cycle. The parasite escapes from

5742-540: The bloodstream. In the blood, the merozoites rapidly invade individual red blood cells , replicating over 24–72 hours to form 16–32 new merozoites. The infected red blood cell lyses, and the new merozoites infect new red blood cells, resulting in a cycle that continuously amplifies the number of parasites in an infected person. Over rounds of this infection cycle, a small portion of parasites do not replicate, but instead develop into early sexual stage parasites called male and female " gametocytes ". These gametocytes develop in

5841-408: The brain, they contribute to coma . In the placenta they contribute to low birthweight and preterm labor, and increase the risk of abortion and stillbirth. The destruction of red blood cells during infection often results in anemia, exacerbated by reduced production of new red blood cells during infection. Only female mosquitoes feed on blood; male mosquitoes feed on plant nectar and do not transmit

5940-434: The cause, recurrence can be classified as either recrudescence , relapse , or reinfection. Recrudescence is when symptoms return after a symptom-free period due to failure to remove blood-stage parasites by adequate treatment. Relapse is when symptoms reappear after the parasites have been eliminated from the blood but have persisted as dormant hypnozoites in liver cells. Relapse commonly occurs between 8 and 24 weeks after

6039-504: The creations were subject to being abruptly disregarded due to the cascading "gaze of fashion". Wallace Stevens adjusted his poetic standards due to a "perception of ephemerality" that living in New York City instigated. Art Spiegelman asserted that the format of comics, even during degradation, defies ephemerality, although they have been deemed as such. Women's writing, the likes of diaries and political pamphlets, have amassed

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6138-521: The development of respiratory distress , which occurs in up to 25% of adults and 40% of children with severe P. falciparum malaria. Possible causes include respiratory compensation of metabolic acidosis , noncardiogenic pulmonary oedema , concomitant pneumonia , and severe anaemia . Although rare in young children with severe malaria, acute respiratory distress syndrome occurs in 5–25% of adults and up to 29% of pregnant women. Coinfection of HIV with malaria increases mortality. Kidney failure

6237-509: The disease in the long run, but the initial costs required are out of reach of many of the world's poorest people. There is a wide difference in the costs of control (i.e. maintenance of low endemicity) and elimination programs between countries. For example, in China—whose government in 2010 announced a strategy to pursue malaria elimination in the Chinese provinces —the required investment is

6336-578: The disease is common. Occasional doses of the combination medication sulfadoxine/pyrimethamine are recommended in infants and after the first trimester of pregnancy in areas with high rates of malaria. As of 2023, two malaria vaccines have been endorsed by the World Health Organization . The recommended treatment for malaria is a combination of antimalarial medications that includes artemisinin . The second medication may be either mefloquine , lumefantrine , or sulfadoxine/pyrimethamine. Quinine , along with doxycycline , may be used if artemisinin

6435-475: The disease months later. In those who have recently survived an infection, reinfection usually causes milder symptoms. This partial resistance disappears over months to years if the person has no continuing exposure to malaria. The mosquito vector is itself harmed by Plasmodium infections, causing reduced lifespan. Human malaria is caused by single-celled microorganisms of the Plasmodium group. It

6534-462: The disease. Females of the mosquito genus Anopheles prefer to feed at night. They usually start searching for a meal at dusk, and continue through the night until they succeed. However, in Africa, due to the extensive use of bed nets, they began to bite earlier, before bed-net time. Malaria parasites can also be transmitted by blood transfusions , although this is rare. Symptoms of malaria can recur after varying symptom-free periods. Depending upon

6633-578: The driest and lowest place in North America, Death Valley (more specifically Badwater Basin ), became flooded with a short-lived ephemeral lake in the spring of 2005. Costelloe et al. (2009) describes salt lakes found in the arid zone of Australia as profoundly ephemeral. There are also ephemeral islands such as Banua Wuhu and Home Reef . These islands appear when volcanic activity increases their height above sea level, but disappear over several years due to wave erosion. Bassas da India , on

6732-646: The ecosystems of ephemeral pools. Ephemeral habitat patches have repeatedly been assessed as detrimental to metapopulation persistence, although metapopulations are not always negatively affected by ephemeral landscapes. These patches occur as a result of the habitat's turnover. Ephemeral streams have, relative to their perennial counterparts, lower species richness; the streams are "potentially demanding" for inhabitants, although some species do reside. Ephemeral rivers sometimes form waterholes in geological depressions or areas scoured by erosion, and are common in arid regions of Australia. The ephemerality of

6831-452: The ephemerality of dreams was utilised in ample East Asian literature as a metaphor for immaterial reality whereas Baroque writings depicted the matter as analogous to life. Scholar of comparative literature Stuart Lasine noted that writers have frequently invoked ephemerality as a negative aspect of the human condition . Ephemerality was profound to Dōgen and was intertwined with sorrow and regret; he used "the imagery of ephemerality" in

6930-494: The eyes to turn together in the same direction), opisthotonus , seizures , or coma . Diagnosis based on skin odor profiles Humans emanate a large range of smells. Studies have been conducted on how to detect human malaria infections through volatile compounds from the skin - suggesting that volatile biomarkers may be a reliable source for the detection of infection, including those asymptomatic. Using skin body odor profiles can be efficient in diagnosing global populations, and

7029-442: The frequency with which malaria parasites complete their life cycle in the cell. Individuals who are homozygous (with two copies of the abnormal haemoglobin beta allele ) have sickle-cell anaemia , while those who are heterozygous (with one abnormal allele and one normal allele) experience resistance to malaria without severe anaemia. Although the shorter life expectancy for those with the homozygous condition would tend to disfavour

7128-399: The highest attractiveness to anthropophilic mosquitoes. Some of these studies have included traps that had been baited with nylon socks previously worn by human participants and were deemed efficient in catching adult mosquitos. Foot odors have high numbers of volatile compounds, which in turn elicit an olfactory response from mosquitoes. Malaria has several serious complications , including

7227-429: The home, and an increase in mosquitoes that are resistant to insecticides. Modifications to people's houses to prevent mosquito exposure may be an important long term prevention measure. Mosquito nets help keep mosquitoes away from people and reduce infection rates and transmission of malaria. Nets are not a perfect barrier and are often treated with an insecticide designed to kill the mosquito before it has time to find

7326-572: The immateral nature means that there can only be an approximation: "In other words, there must always be an ephemeral beyond the ephemeral". Film has been used to document and combat ephemeral aspects of human development. Digital media's encompassing archival process means that information of varying importance can either be affixed or ephemeral, the former seen as the more generally common outcome. Digital personas, on account of precariousness and whim, can be entirely ephemeral, without any record. Grey literature has prove particularly vulnerable to

7425-423: The infection of red blood cells. Symptoms develop once there are more than around 100,000 parasites per milliliter of blood. Many of the symptoms associated with severe malaria are caused by the tendency of P. falciparum to bind to blood vessel walls, resulting in damage to the affected vessels and surrounding tissue. Parasites sequestered in the blood vessels of the lung contribute to respiratory failure . In

7524-502: The initial symptoms and is often seen in P. vivax and P. ovale infections. P. vivax malaria cases in temperate areas often involve overwintering by hypnozoites, with relapses beginning the year after the mosquito bite. Reinfection means that parasites were eliminated from the entire body but new parasites were then introduced. Reinfection cannot readily be distinguished from relapse and recrudescence, although recurrence of infection within two weeks of treatment ending

7623-461: The internet and features that engender ephemerality, such as link rot , has elicited concern in regards to scholarly practice. Like a blade of grass, My frail body Treading the path to Kyoto Seeming to wander Amid the cloudy mist on Kinobe Pass. Dōgen . Ephemerality has been studied in the context of dancing. Witnessing a dance that will be rendered ephemeral is resultingly commodified and of greater desire to prospecting audiences;

7722-593: The internet's ephemerality. Ephemeral acquired its common meaning of short-living in the mid-19th century and has connotations of passing time, fragility, change, disappearance, transformation, and the "philosophically ultimate vision of our own existence". Sarah Kofman questioned if "the beauty that conceals the evanescent nature of all things were itself ephemeral". Rather than melancholic, Sigmund Freud and Walter Pater viewed ephemerality as valuable; awareness and acceptance were to Freud commendable. Multiple scholars have viewed ephemerality as intrinsic to

7821-406: The likes of airports, malls, supermarkets, office blocks, and hotels thus rendering them, per his definition, " non-places ". Architecture scholar Anastasia Karandinou argued that the practice's modern relation to ephemerality correlated with digital media's evolution, which she says has enabled new conceptions of space and everyday thinking. Of an indefinite and contentious nature, the definition of

7920-634: The liver undetected by wrapping itself in the cell membrane of the infected host liver cell. Within the red blood cells, the parasites multiply further, again asexually, periodically breaking out of their host cells to invade fresh red blood cells. Several such amplification cycles occur. Thus, classical descriptions of waves of fever arise from simultaneous waves of merozoites escaping and infecting red blood cells. Some P. vivax sporozoites do not immediately develop into exoerythrocytic-phase merozoites, but instead, produce hypnozoites that remain dormant for periods ranging from several months (7–10 months

8019-423: The matter to explore time, memory, politics, emotions, spirituality and death. The Dada , Fluxus , Surreal, and Futurist movements all incorporated ephemerality as have Kuba , Mono-ha , and ukiyo-e . Perceptions of ephemerality vary between cultures, from melancholy and mitigation to embrace. Performance art has frequently been described as ephemeral in nature; with regards to historical performances,

8118-431: The metabolism of glycerol, lactic acid, amino acids, and lipids - through the action of bacteria found within the skin. They create a “chemical signature” for the mosquitoes to locate a potential host, humans in particular. Lactic acid Lactic acid, a naturally produced levorotatory isomer, has been titled an attractant of mosquitoes for a long time. Lactic acid is predominantly produced by eccrine-sweat glands, creating

8217-504: The modified haemoglobin S molecules are exposed to low amounts of oxygen, or crowd together due to dehydration, they can stick together forming strands that cause the cell to distort into a curved sickle shape. In these strands, the molecule is not as effective in taking or releasing oxygen, and the cell is not flexible enough to circulate freely. In the early stages of malaria, the parasite can cause infected red cells to sickle, and so they are removed from circulation sooner. This reduces

8316-464: The other hand, is a near-sea level island that appears only at low tide. On account of changing demarcation, shores exist as ephemeral. Only a small amount of southern Costa Rica 's secondary forests reach maturity, indicating that they may be "generally ephemeral". Deciduous forests, via the seasonal change of leaves, are subject to natural ephemeral changes. Ephemeral pools located in forests are commonly known as "vernal pools", often lasting in

8415-574: The parasite eventually disappears from that area, as happened in North America, Europe, and parts of the Middle East. However, unless the parasite is eliminated from the whole world, it could re-establish if conditions revert to a combination that favors the parasite's reproduction. Furthermore, the cost per person of eliminating anopheles mosquitoes rises with decreasing population density, making it economically unfeasible in some areas. Prevention of malaria may be more cost-effective than treatment of

8514-464: The point that ephemerality is perhaps an "outdated concept". Within the context of modern media dissemination, YouTube videos, viral emails and photos have been identified as ephemeral; as have means of advertising, both physical and digital and the internet collectively. Ephemeral media has been described as that which is brief in duration and/or circulation, adjacent to "the primary texts of contemporary entertainment culture". YouTube has "become

8613-605: The precarious survival of offspring. Fletcher's frogs use these sites to exploit them, by-passing predation and competition. Tadpoles , however, are hindered by ephemeral streams, as can surrounding systems. Limited and unpredictable food availability means ephemeral waterbodies may be rife with cannibalism . Specific adaptions to ephemeral pools are abundant. Human alterations to the habitats of ephemeral nectar that flying foxes consume has led to urban migration. Climate change significantly affects ephemeral freshwater systems and changes in climates may be precisely identified by

8712-456: The prevention of bites. As of 2023, there are two malaria vaccines , approved for use in children by the WHO: RTS,S and R21 . The presence of malaria in an area requires a combination of high human population density, high Anopheles mosquito population density and high rates of transmission from humans to mosquitoes and from mosquitoes to humans. If any of these is lowered sufficiently,

8811-552: The resulting memory from taking a photograph. Psychologists have studied why ephemerality may improve memory retention; social psychologist Karl E. Scheibe, conversely, suggested that ephemeral images are only memorable if repeated. The ephemerality of memory leads objects to assume the function of begeting remembrance on account of their greater stability. Objects which are ephemeral, per one perspective, are those whose compositional material experience chemical or physical changes and are thus permanently altered; this process occurs in

8910-411: The richest (71%) and the poorest (53%) households. Malaria is usually confirmed by the microscopic examination of blood films or by antigen -based rapid diagnostic tests (RDT). Microscopy—i.e. examining Giemsa -stained blood with a light microscope —is the gold standard for malaria diagnosis. Microscopists typically examine both a "thick film" of blood, allowing them to scan many blood cells in

9009-781: The same is true of fairs . Muñoz posited that the physical proximation of dance, which coupled with the "shared rhythm", results in a unified yet ephemeral status of those engaged. La Sylphide sees ephemerality as a notable theme. Professor of Dance Mark Franko contended that the artform is approaching a state of being "post-ephemeral" while Diane Taylor viewed the lasting impact a performance may have as negating notions of ephemerality. The documentation of other ephemeral events: protests, installations, exhibitions, are often meager – public events, of varying size, naturally generate ephemeral material. "[Ephemerality] and disposability" have been perceived as components "of an American ethos"; alternative history novels such as The Man in

9108-437: The screening and monitoring of infection to officially eradicate malaria. Research findings have predominantly relied on chemical explanations to explain the differences in attractiveness among humans based on distinct odor profiles. The existence of volatile compounds, like fatty acids, and lactic acid is an essential reason on why some individuals are more appealing to mosquitos than others. Volatile compounds Kanika Khanna,

9207-563: The spleen. The blockage of the microvasculature causes symptoms such as those in placental malaria. Sequestered red blood cells can breach the blood–brain barrier and cause cerebral malaria. Due to the high levels of mortality and morbidity caused by malaria—especially the P. falciparum species—it has placed the greatest selective pressure on the human genome in recent history. Several genetic factors provide some resistance to it including sickle cell trait , thalassaemia traits, glucose-6-phosphate dehydrogenase deficiency , and

9306-423: The traces: playbills, scrapbooks of newspaper clippings and material artifacts are themselves ephemeral. Literature is ephemeral, including definitions and "all printed texts". Ephemeral was first used colloquially in reference to printed matters. By 1750, an "expansion of all kinds of ephemeral print" had occurred. Hazlitt contended that such ephemerality was the result of widespread aestheticism , thus

9405-612: The trait's survival, the trait is preserved in malaria-prone regions because of the benefits provided by the heterozygous form. Liver dysfunction as a result of malaria is uncommon and usually only occurs in those with another liver condition such as viral hepatitis or chronic liver disease . The syndrome is sometimes called malarial hepatitis . While it has been considered a rare occurrence, malarial hepatopathy has seen an increase, particularly in Southeast Asia and India. Liver compromise in people with malaria correlates with

9504-415: The urine with kidney failure may occur. Complications may include spontaneous bleeding, coagulopathy , and shock . Malaria during pregnancy can cause stillbirths , infant mortality , miscarriage , and low birth weight , particularly in P. falciparum infection, but also with P. vivax . Malaria is caused by infection with parasites in the genus Plasmodium . In humans, malaria

9603-424: The urine , retinal damage , and convulsions . The classic symptom of malaria is paroxysm —a cyclical occurrence of sudden coldness followed by shivering and then fever and sweating, occurring every two days ( tertian fever ) in P. vivax and P. ovale infections, and every three days ( quartan fever ) for P. malariae . P. falciparum infection can cause recurrent fever every 36–48 hours, or

9702-401: The vast majority of malaria deaths), P. vivax , and P. knowlesi (a simian malaria that spills over into thousands of people a year). P. ovale and P. malariae generally cause a milder form of malaria. Malaria is typically diagnosed by the microscopic examination of blood using blood films , or with antigen-based rapid diagnostic tests . Methods that use

9801-427: The world where malaria is common were protected by an ITN. That number increased to 20.3 million (18.5%) African children using ITNs in 2007, leaving 89.6 million children unprotected and to 68% African children using mosquito nets in 2015. The percentage of children sleeping under ITNs in sub-Saharan Africa increased from less than 40% in 2011 to over 50% in 2021. Most nets are impregnated with pyrethroids ,

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