Alphabetical Browse | Britannica
eye disease: Tumours of the lids: …of the blood vessels, called hemangiomas, may occur in the lids and give rise to soft, ... Haematopus (bird). oystercatcher, any of several shorebirds, notable for their long, flattened, orange-red bills, constituting ... haemorrhoid (disease). hemorrhoid, mass formed by distension of the network of veins under the mucous membrane that lines the ... Haematopus bachmani (bird). oystercatcher: The black oystercatcher (H. bachmani), of western North America, and the sooty ...
freshwater snail
Several species are hosts to a variety of parasitic flatworm species (called trematodes) that cause disease in humans and other ... Freshwater snails are dispersed between isolated bodies of water via birds feet, wind-blown leaves, and floods. ...
Sir Ronald Ross
Using birds that were sick with malaria, he was soon able to ascertain the entire life cycle of the malarial parasite, ... In 1912 he became physician for tropical diseases at Kings College Hospital, London, and later director of the Ross Institute ... He demonstrated that malaria is transmitted from infected birds to healthy ones by the bite of a mosquito, a finding that ... and laid the foundation for combating the disease. ... and Hospital for Tropical Diseases, founded in his honour. In ...
tarantula
The goliath bird-eating spider (T. leblondi or T. blondi) has a body length up to 7.5 cm (almost 3 inches) and in rare ... The bite of L. tarentula was once thought to cause a disease known as tarantism, in which the victim wept and skipped about ... Both the pinkfoot goliath (T. apophysis) and the goliath bird-eating spider can attain leg spans of about 30 cm (12 inches). ... Other spiders belonging to the same family as the New World tarantulas are the monkey spiders of Africa and the bird-eating ...
Life Cycle, Processes & Properties Browse - Page 12 | Britannica
Newcastle disease. Newcastle disease, a serious viral disease of birds caused by a paramyxovirus and marked by respiratory and ... nervous system disease, human. nervous system disease, any of the diseases or disorders that affect the functioning of the ... nutritional disease. nutritional disease, any of the nutrient-related diseases and conditions that cause illness in humans. ... occupational disease. occupational disease, any illness associated with a particular occupation or industry. Such diseases ...
eye disease
... any of the diseases or disorders that affect the human eye. Learn about the more common types of diseases of the eye and its ... Home Health & Medicine Conditions & Diseases Diseases of the Senses Science & Tech eye disease. ... Birds, Reptiles & Other Vertebrates. *Bugs, Mollusks & Other Invertebrates. *Environment. *Fossils & Geologic Time ... eye disease, any of the diseases or disorders that affect the human eye. ...
Cardiovascular disease - Ventricular Arrhythmia, Risk Factors, Treatment | Britannica
Cardiovascular disease - Ventricular Arrhythmia, Risk Factors, Treatment: Ventricular arrhythmias represent the major mechanism ... Birds, Reptiles & Other Vertebrates. *Bugs, Mollusks & Other Invertebrates. *Environment. *Fossils & Geologic Time ... Home Health & Medicine Conditions & Diseases Cardiovascular & Circulatory System Diseases Ventricular arrhythmia. Ventricular ... heart valve disease, and chronic kidney disease. However, a large group of people develop ventricular dysfunction and ...
Leber's disease
... human genetic disease: Diseases associated with single-gene non-Mendelian inheritance: …of neurodegenerative disorders, such as ... Leber hereditary optic neuropathy (LHON), that result from inherited mutations in the mitochondrial DNA; and diseases that ... human genetic disease. *. In human genetic disease: Diseases associated with single-gene non-Mendelian inheritance. …of ... Birds, Reptiles & Other Vertebrates. *Bugs, Mollusks & Other Invertebrates. *Environment. *Fossils & Geologic Time ...
flesh fly
Birds, Reptiles & Other Vertebrates. *Bugs, Mollusks & Other Invertebrates. *Environment. *Fossils & Geologic Time ...
Dutch elm disease
... , widespread fungoid killer of elm trees, first described in the Netherlands. ... Birds, Reptiles & Other Vertebrates. *Bugs, Mollusks & Other Invertebrates. *Environment. *Fossils & Geologic Time ... Dutch elm disease is caused by three species of ascomycete fungi in the genus Ophiostoma. One of these, O. ulmi (also known as ... Dutch elm disease, widespread fungoid killer of elms (Ulmus species) and certain other trees, first described in the ...
protozoal disease
... disease caused by protozoans. These organisms may remain in the human host for their entire life cycle, but many carry out part ... Birds, Reptiles & Other Vertebrates. *Bugs, Mollusks & Other Invertebrates. *Environment. *Fossils & Geologic Time ... protozoal disease, disease caused by protozoans. These organisms may remain in the human host for their entire life cycle, but ...
Renal system disease - Chronic, Kidney, Dialysis | Britannica
Renal system disease - Chronic, Kidney, Dialysis: The term uremia, though it is sometimes used as if it were interchangeable ... Birds, Reptiles & Other Vertebrates. *Bugs, Mollusks & Other Invertebrates. *Environment. *Fossils & Geologic Time ... Home Health & Medicine Conditions & Diseases Digestive & Renal System Diseases Chronic renal failure. The term uremia, though ... They include congenital anomalies and hereditary disorders; diseases of connective tissue; tuberculosis; the effects of ...
Digestive system disease - Colitis, Crohn's, Ulcerative | Britannica
A wide variety of diseases and disorders occur in the large intestine. Abnormal rotation of the colon is fairly frequent and ... Home Health & Medicine Conditions & Diseases Digestive & Renal System Diseases Large intestine. A wide variety of diseases and ... Birds, Reptiles & Other Vertebrates. *Bugs, Mollusks & Other Invertebrates. *Environment. *Fossils & Geologic Time ... Brain disease, metabolic failure, or drugs can dull the normal signals that give rise to the urge to defecate. Poor abdominal ...
Cardiovascular disease - Abnormalities, Heart Chambers, Risk Factors | Britannica
Cardiovascular disease - Abnormalities, Heart Chambers, Risk Factors: Abnormalities of the heart chambers may be serious and ... Birds, Reptiles & Other Vertebrates. *Bugs, Mollusks & Other Invertebrates. *Environment. *Fossils & Geologic Time ... Home Health & Medicine Conditions & Diseases Cardiovascular & Circulatory System Diseases Abnormalities of individual heart ... In many complex forms of congenital heart disease, the aorta and pulmonary artery do not originate from their normal areas of ...
Blood disease - Leukocytosis, Causes, Symptoms | Britannica
Blood disease - Leukocytosis, Causes, Symptoms: The condition in which white cells are present in greater numbers than normal ... Birds, Reptiles & Other Vertebrates. *Bugs, Mollusks & Other Invertebrates. *Environment. *Fossils & Geologic Time ... Home Health & Medicine Conditions & Diseases Cardiovascular & Circulatory System Diseases Leukocytosis. The condition in which ... The blood serum contains an antibody (sheep cell or heterophil agglutinin) that is characteristic of the disease, but ...
Infectious disease - Natural Immunity, Acquired Immunity | Britannica
Humans have a high degree of resistance to foot-and-mouth disease, for example, while the cattle and sheep with which they may ... Rats are highly resistant to diphtheria, whereas unimmunized children readily contract the disease. What such resistance ... Every animal species possesses some natural resistance to disease. ... 8 Birds That Cant Fly Whats the Difference Between a Solstice and an Equinox? ...
Alphabetical Browse | Britannica
The disease may be avoided by planting a thick stand as early as possible or when suggested for the area to avoid spring ... Agapornis personata (bird). lovebird: The black-masked lovebird, A. personata (see photograph), of Tanzania is green with a ... Agapornis roseicollis (bird). lovebird: The largest species is the rosy-faced lovebird, A. roseicollis, of Angola to South ... Agapornis (bird). lovebird, any of nine species of small parrots, genus Agapornis (subfamily Psittacinae), of Africa and ...
Dog - Training, Obedience, Socialization | Britannica
A dog bred to guard the home will be less likely to run off following a scent than a bird dog bred to hunt game. On the other ... Eye diseases, many of which are hereditary, also are found in dogs. Dogs are subject to cataracts, glaucoma, and retinal ... Dogs with dropped ears-the basset hound is an extreme example-are prone to diseases of the ear canal. Moisture becomes trapped ... Fleas and ticks are sources of irritation and disease in every climate of the world (with the possible exception of the Arctic ...
Canada - Farming, Forestry, Fishing | Britannica
Canadas forest industry has to struggle constantly against the threats of fire, insects, and disease. Some control of insects ... has been achieved through the aerial spraying of insecticides, but this practice also eradicates insect-eating birds and ...
Alphabetical Browse | Britannica
blood disease: Thalassemia and hemoglobinopathies: …mild form of the disease, thalassemia minor, there is usually only slight ... birds and mammals). Because of ... cardiovascular disease: Valvular disease: …human beings after ... human genetic disease: Autosomal dominant inheritance: It manifests itself in the heterozygote (designated Aa), who receives a ... In such a case the pedigree (i.e., a pictorial representation of family history) is vertical-that is, the disease passes from ...
Africa - Conservation, Wildlife, Biodiversity | Britannica
In East Africa there are also sanctuaries for birds and marine organisms. The conservation of vegetation is undertaken mainly ... Diseases have reduced crop productivity, spoiled harvests, and acted as a curb on the better integration of land use and on the ... In East Africa there are also sanctuaries for birds and marine organisms. The conservation of vegetation is undertaken mainly ... They may prey on people or on livestock or carry diseases affecting either. The bilharzia snail and the Simulium fly (host to ...
palate
Why Dont Birds Have Teeth? How Do Face Masks Control the Spread of Disease? ... Palates similar to those in humans occur only in birds and some mammals. In a few whales the mucous membrane forms toughened ...
Alphabetical Browse | Britannica
Calypte helenae (bird). hummingbird: The smallest species, the bee hummingbird (Mellisuga, sometimes Calypte, helenae) of Cuba ... occur in smears from the lesions or in biopsy material and are thought to be the cause of the disease. Granuloma inguinale is ... Calyptomena viridis (bird). broadbill: …represented by the 15-cm (6-inch) lesser green broadbill (Calyptomena viridis), of ... Weighing about 2 g, this species is the smallest living bird and ranks with the pygmy… ...
Alphabetical Browse | Britannica
inflammatory bowel disease: …mutation of a gene called TNFSF15 (tumour necrosis factor ligand superfamily member 15), which is ... Tmetothylacus (bird genus). pipit: in the genera Anthus and Tmetothylacus in the family Motacillidae (order Passeriformes, ... is considered a work of metric virtuosity in its ability to convey the swift movement of the bird who swoops high above the ...
Robert Koch
He discovered the anthrax disease cycle (1876) and the bacteria responsible for tuberculosis (1882) and cholera (1883). For his ... The natural history of the disease was, nevertheless, far from complete.. It was at that point that Koch began. He cultivated ... 8 Birds That Cant Fly The Perils of Industry: 10 Notable Accidents and Catastrophes ... That a disease organism might be cultured outside the body was a concept introduced by Louis Pasteur, but the pure-culture ...
Alphabetical Browse | Britannica
nervous system disease: Cerebral hemispheres: …to one side results in homonymous hemianopia, the loss of all sight in the field ... for birds), regardless of the environmental temperature. The ability to maintain an internal temperature distinguishes these ... connective tissue disease: Hereditary disorders of connective tissue: …the liver and kidney enzyme homogentisic acid oxidase ... blood disease: Thalassemia and hemoglobinopathies: Thalassemia major (Cooley anemia) is characterized by severe anemia, ...
Alphabetical Browse | Britannica
Crohn disease (pathology). Crohn disease, chronic inflammation of the digestive tract, usually occurring in the terminal ... more closely related to modern crocodiles than modern birds. Although the group flourished during the Triassic Period (251 ... Crohns disease (pathology). Crohn disease, chronic inflammation of the digestive tract, usually occurring in the terminal ... The disease can be lethal, and surviving trees are left vulnerable to destructive bark beetles. White pine blister rust, caused ...
Capnocytophaga canimorsus
... zoonotic disease: Populations at increased risk: …of illness and death from Capnocytophaga canimorsus infection, which can be ... zoonotic diseases. * In zoonotic disease: Populations at increased risk. …of illness and death from Capnocytophaga canimorsus ... Birds, Reptiles & Other Vertebrates. *Bugs, Mollusks & Other Invertebrates. *Environment. *Fossils & Geologic Time ...
Alphabetical Browse | Britannica
Huntington disease (pathology). Huntington disease , a relatively rare, and invariably fatal, hereditary neurological disease ... hunting, sport that involves the seeking, pursuing, and killing of wild animals and birds, called game and game birds, ... Huntington disease: …in a gene known as HD (officially named huntingtin [Huntington disease]). This gene, which is located on ... Huntington disease , a relatively rare, and invariably fatal, hereditary neurological disease that is characterized by ...
Uninvited Guests: The 7 Worst Parasitic Worms | Britannica
guinea worm disease. The Carter Center/Centers For Disease Control and Prevention. Transmitted when a person drinks water ... Birds, Reptiles & Other Vertebrates. *Bugs, Mollusks & Other Invertebrates. *Environment. *Fossils & Geologic Time ... Mae Melvin/Centers for Disease Control and Prevention (CDC)(Image Number: 1515). There are about 5,000 species of these ...