Arthropods of the class ARACHNIDA, order Araneae. Except for mites and ticks, spiders constitute the largest order of arachnids, with approximately 37,000 species having been described. The majority of spiders are harmless, although some species can be regarded as moderately harmful since their bites can lead to quite severe local symptoms. (From Barnes, Invertebrate Zoology, 5th ed, p508; Smith, Insects and Other Arthropods of Medical Importance, 1973, pp424-430)
Venoms of arthropods of the order Araneida of the ARACHNIDA. The venoms usually contain several protein fractions, including ENZYMES, hemolytic, neurolytic, and other TOXINS, BIOLOGICAL.
The effects, both local and systemic, caused by the bites of SPIDERS.
A venomous New World spider with an hourglass-shaped red mark on the abdomen.
A continuous protein fiber consisting primarily of FIBROINS. It is synthesized by a variety of INSECTS and ARACHNIDS.
Fibrous proteins secreted by INSECTS and SPIDERS. Generally, the term refers to silkworm fibroin secreted by the silk gland cells of SILKWORMS, Bombyx mori. Spider fibroins are called spidroins or dragline silk fibroins.
Instinctual behavior pattern in which food is obtained by killing and consuming other species.
A spider of the genus Loxosceles, found in the midwestern and other parts of the United States, which carries a hemolytic venom that produces local necrosis or ulceration.
A subfamily in the family ATELIDAE, comprising three genera: woolly monkeys (Lagothrix), spider monkeys (Ateles), and woolly spider monkeys (Brachyteles).
Venoms from animals of the phylum Arthropoda. Those most investigated are from scorpions and spiders of the class Arachnidae and from ant, bee, and wasp families of the Insecta order Hymenoptera. The venoms contain protein toxins, enzymes, and other bioactive substances and may be lethal to man.
A class of Arthropoda that includes SPIDERS; TICKS; MITES; and SCORPIONS.
A class of polyamine and peptide toxins which are isolated from the venom of spiders such as Agelenopsis aperta.
Eating other individuals of one's own species.
Toxic substances from microorganisms, plants or animals that interfere with the functions of the nervous system. Most venoms contain neurotoxic substances. Myotoxins are included in this concept.

Hypersensitivity in the anterior median eye of a jumping spider. (1/701)

Changes in sensitivity of the photoreceptor cells of the anterior median eye of the jumping spider Menemerus confusus Boes. et Str. have been studied by recording electroretinograms (ERGs) and receptor potentials. The amplitudes of the responses (ERGs and receptor potentials) increase during repetitive stimulation, with a maximum increase at 3-5 s intervals. The sensitivity of the photoreceptor cell is greater for about 60 s following illumination (maximum magnitude at 3-5 s) than it is during complete dark adaptation. This phenomenon, which we call 'hypersensitivity', is lost within one day following surgery in physiological saline. Upon loss of hypersensitivity, the sensitivity decrease during light adaptation is greater than for the normal eye and the small increase of sensitivity following the onset of illumination observed for the normal eye is lost.  (+info)

Purification from black widow spider venom of a protein factor causing the depletion of synaptic vesicles at neuromuscular junctions. (2/701)

The aqueous extract of the venom glands of black widow spiders was fractionated on a column of Sephadex G-200 and then on a column of DEAE-Sephadex A-50 pH 8.2. A protein fraction was obtained that caused a great increase in the frequency of occurrence of miniature end plate potentials at the frog neuromuscular junction, and caused swelling of the nerve terminals and depleted them of their vesicles. The fraction consists of a least four protein components that are similar in their molecular weights (about 130,000) and isoelectric points (ranging from pH 5.2 to 5.5) and are immunologically indistinguishable. It contains no sugar residues and has little or no lipolytic or proteolytic activity. The fraction is toxic to mice and is different from the fractions that act on houseflies, the crayfish stretch receptor and the cockroach heart. It seems pure enough to warrant a detailed study of its site and mode of action.  (+info)

Sexually transmitted chemical defense in a moth (Utetheisa ornatrix). (3/701)

The arctiid moth Utetheisa ornatrix is protected against predation by pyrrolizidine alkaloids (PA) that it sequesters as a larva from its food plant. Earlier work had shown that males transmit PA to the female with the sperm package and that the female bestows part of this gift on the eggs, protecting these against predation as a result. We now show that the female herself derives protection from the gift. Females deficient in PA are vulnerable to predation from spiders (Lycosa ceratiola and Nephila clavipes). If mated with a PA-laden male, the females become unacceptable as prey. The effect takes hold promptly and endures; females are unacceptable to spiders virtually from the moment they uncouple from the male and remain unacceptable as they age. Chemical data showed that the female allocates the received PA quickly to all body parts. We predict that other instances will be found of female insects being rendered invulnerable by receipt of sexually transmitted chemicals.  (+info)

Voltage-activated potassium outward currents in two types of spider mechanoreceptor neurons. (4/701)

We studied the properties of voltage-activated outward currents in two types of spider cuticular mechanoreceptor neurons to learn if these currents contribute to the differences in their adaptation properties. Both types of neurons adapt rapidly to sustained stimuli, but type A neurons usually only fire one or two action potentials, whereas type B neurons can fire bursts lasting several hundred milliseconds. We found that both neurons had two outward current components, 1) a transient current that activated rapidly when stimulated from resting potential and inactivated with maintained stimuli and 2) a noninactivating outward current. The transient outward current could be blocked by 5 mM tetraethylammonium chloride, 5 mM 4-aminopyridine, or 100 microM quinidine, but these blockers also reduced the amplitude of the noninactivating outward current. Charybdotoxin or apamin did not have any effect on the outward currents, indicating that Ca2+-activated K+ currents were not present or not inhibited by these toxins. The only significant differences between type A and type B neurons were found in the half-maximal activation (V50) values of both currents. The transient current had a V50 value of 9. 6 mV in type A neurons and -13.1 mV in type B neurons, whereas the V50 values of noninactivating outward currents were -48.9 mV for type A neurons and -56.7 mV for type B neurons. We conclude that, although differences in the activation kinetics of the voltage-activated K+ currents could contribute to the difference in the adaptation behavior of type A and type B neurons, they are not major factors.  (+info)

Effects of size, motility and paralysation time of prey on the quantity of venom injected by the hunting spider Cupiennius salei. (5/701)

Previous experimental studies have shown that neotropical wandering spiders (Cupiennius salei) inject more venom when attacking larger crickets. It has been postulated that this is a consequence of predator-prey interactions during envenomation, which increase in intensity with the size of a given prey species. The present study was designed to test this hypothesis using anaesthetized crickets of different sizes that were moved artificially. Cupiennius salei was found (1) to inject more venom the greater the intensity of the struggling movement of the crickets (prey size kept constant); (2) to inject more venom the longer the duration of the struggling movement of the crickets (prey size and intensity of movement kept constant); and (3) to inject equal amounts into crickets of different size (duration and intensity of movement kept constant). These results indicate that C. salei alters the amount of venom it releases according to the size and motility of its prey. Venom expenditure depends mainly on the extent of the interactions with the prey during the envenomation process, whereas prey size is of minor significance. The regulation of venom injection in concert with behavioural adaptations in response to various types of prey minimizes the energetic cost of venom production, thus increasing the profitability of a given prey item.  (+info)

Inhibition of glutamate uptake by a polypeptide toxin (phoneutriatoxin 3-4) from the spider Phoneutria nigriventer. (6/701)

Glutamate concentration increases significantly in the extracellular compartment during brain ischaemia and anoxia. This increase has an important Ca(2+)-independent component, which is due in part to the reversal of glutamate transporters of the plasma membrane of neurons and glia. The toxin phoneutriatoxin 3-4 (Tx3-4) from the spider Phoneutria nigriventer has been reported to decrease the evoked glutamate release from synaptosomes by inhibiting Ca(2+) entry via voltage-dependent Ca(2+) channels. However, we report here that Tx3-4 is also able to inhibit the uptake of glutamate by synaptosomes in a time-dependent manner and that this inhibition in turn leads to a decrease in the Ca(2+)-independent release of glutamate. No other polypeptide toxin so far described has this effect. Our results suggest that Tx3-4 can be a valuable tool in the investigation of function and dysfunction of glutamatergic neurotransmission in diseases such as ischaemia.  (+info)

The mechanical design of spider silks: from fibroin sequence to mechanical function. (7/701)

Spiders produce a variety of silks, and the cloning of genes for silk fibroins reveals a clear link between protein sequence and structure-property relationships. The fibroins produced in the spider's major ampullate (MA) gland, which forms the dragline and web frame, contain multiple repeats of motifs that include an 8-10 residue long poly-alanine block and a 24-35 residue long glycine-rich block. When fibroins are spun into fibres, the poly-alanine blocks form (&bgr;)-sheet crystals that crosslink the fibroins into a polymer network with great stiffness, strength and toughness. As illustrated by a comparison of MA silks from Araneus diadematus and Nephila clavipes, variation in fibroin sequence and properties between spider species provides the opportunity to investigate the design of these remarkable biomaterials.  (+info)

Spider hemocyanin binds ecdysone and 20-OH-ecdysone. (8/701)

Fluorescence quenching studies and binding experiments with [(3)H]ecdysone reveal that the respiratory protein, hemocyanin, of the tarantula Eurypelma californicum binds ecdysone. The binding constant for ecdysone ranges between 0.5 and 5 mM, indicating a low affinity binding. However, it is comparable with those found for the ecdysone binding to hexamerins from insects. Based on a comparison of sequences and x-ray structures of arthropodan hemocyanins, we propose an evolutionary conserved hydrophobic pocket in domain 1 of the hemocyanin subunit that may bind ecdysone.  (+info)

I'm sorry for any confusion, but "spiders" is not a term that has a specific medical definition. It is a common name used to refer to arachnids of the order Araneae, characterized by having two main body parts (the cephalothorax and abdomen), eight legs, and fangs that inject venom.

However, in a medical context, "spider" or "spider bite" may be used to describe skin lesions or reactions resulting from the bite of certain spiders, particularly those with medically significant venoms. For example, necrotic arachnidism is a condition caused by the bite of some spider species, such as recluse spiders (Loxosceles spp.). The bites can cause skin necrosis and other systemic symptoms in severe cases.

If you are looking for information on a specific medical topic or condition, please provide more details so I can offer a more accurate response.

Spider venoms are complex mixtures of bioactive compounds produced by the specialized glands of spiders. These venoms are primarily used for prey immobilization and defense. They contain a variety of molecules such as neurotoxins, proteases, peptides, and other biologically active substances. Different spider species have unique venom compositions, which can cause different reactions when they bite or come into contact with humans or other animals. Some spider venoms can cause mild symptoms like pain and swelling, while others can lead to more severe reactions such as tissue necrosis or even death in extreme cases.

A spider bite is not a medical condition in and of itself, but rather an injury caused by the puncture of the skin by the fangs of a spider. Not all spiders are capable of penetrating human skin, and only a small number of species found in certain parts of the world have venom that can cause harmful reactions in humans.

The symptoms of a spider bite can vary widely depending on the species of spider, the amount of venom injected, the sensitivity of the person bitten, and the location of the bite. Some common symptoms include redness, swelling, pain, itching, and formation of a blister at the site of the bite. In more severe cases, symptoms such as muscle cramps, nausea, vomiting, fever, chills, and difficulty breathing can occur.

It is important to note that many skin reactions that are attributed to spider bites may actually be caused by other factors such as bacterial infections or allergic reactions. Accurate identification of the spider responsible for a bite is often difficult, and in most cases, treatment is directed at relieving symptoms and preventing complications.

The black widow spider (Latrodectus mactans) is a species of venomous spider known for the distinctive, hourglass-shaped marking on its abdomen. It is found throughout North America and in parts of Europe, Africa, Asia, and South America. The female black widow spider is typically black or dark brown with a red or orange hourglass-shaped marking on the underside of her abdomen. She is larger than the male, measuring about 1/2 inch in length, while the male is smaller and usually light brown or grayish in color.

The black widow spider's venom contains a neurotoxin called alpha-latrotoxin, which can cause muscle pain, rigidity, and severe cramping. Bites from this spider are rarely fatal to healthy adults but can be dangerous to young children, the elderly, and those with compromised immune systems. Symptoms of a black widow bite may include nausea, sweating, and difficulty breathing.

Black widow spiders build irregular, tangled webs in dark, secluded areas such as woodpiles, sheds, and outdoor toilets. They are not aggressive by nature but will bite if they feel threatened or disturbed. It is essential to seek medical attention immediately if you suspect a black widow spider bite. Treatment may include pain medication, muscle relaxants, and in severe cases, antivenin therapy.

I'm sorry for any confusion, but "Silk" is not a medical term. Silk is a natural protein fiber, mainly composed of fibroin and produced by certain insect larvae to form cocoons. It's commonly used in textiles and other industries for its softness, smoothness, and strength. If you have any questions related to medical terminology or health-related topics, I'd be happy to help with those instead!

Fibroins are a type of protein that make up the structural component of silk fibers produced by certain insects and arachnids, such as silkworms and spiders. These proteins are characterized by their repetitive amino acid sequences, which give silk its unique properties of strength, flexibility, and toughness. Fibroins have been studied for their potential applications in biomedicine, including tissue engineering, drug delivery, and medical textiles.

In the context of mental health and psychology, "predatory behavior" is not a term that is commonly used as a medical diagnosis or condition. However, it generally refers to aggressive or exploitative behavior towards others with the intention of taking advantage of them for personal gain or pleasure. This could include various types of harmful behaviors such as sexual harassment, assault, stalking, bullying, or financial exploitation.

In some cases, predatory behavior may be associated with certain mental health conditions, such as antisocial personality disorder or psychopathy, which are characterized by a disregard for the rights and feelings of others. However, it's important to note that not all individuals who engage in predatory behavior have a mental health condition, and many people who do may not necessarily exhibit these behaviors.

If you or someone else is experiencing harm or exploitation, it's important to seek help from a trusted authority figure, such as a healthcare provider, law enforcement officer, or social worker.

The brown recluse spider (Loxosceles reclusa) is a species of venomous spider that is native to North America. It is also known as the fiddleback spider or violin spider due to the distinctive violin-shaped marking on its cephalothorax. The brown recluse spider is a medium-sized spider, with adults ranging in size from 6 to 20 millimeters in body length. It is characterized by its light to dark brown coloration and lack of conspicuous markings on the abdomen.

The brown recluse spider is known for its necrotic bite, which can cause significant tissue damage and scarring. The venom of the brown recluse spider contains a number of different proteins, including sphingomyelinase D, which is thought to be responsible for the necrotic effects of the bite. The severity of the reaction to a brown recluse spider bite can vary widely, ranging from mild localized reactions to severe systemic reactions that can be life-threatening.

Brown recluse spiders are typically found in the central and southern United States, particularly in the states of Texas, Oklahoma, Kansas, Arkansas, Missouri, Mississippi, Louisiana, Alabama, Georgia, Florida, Tennessee, Kentucky, Ohio, and Indiana. They prefer to live in warm, dry environments and are often found in woodpiles, sheds, barns, and other outbuildings. Inside homes, they can be found in closets, attics, crawl spaces, and underneath furniture.

It is important to note that brown recluse spiders are not aggressive and will only bite if they feel threatened or cornered. If you think you may have been bitten by a brown recluse spider, it is important to seek medical attention as soon as possible. Treatment for a brown recluse spider bite typically involves wound care, pain management, and in some cases, the use of antibiotics to prevent infection.

'Atelinae' is a biological classification category, specifically a tribe, that includes several genera of New World monkeys. These monkeys are characterized by their lack of a tail-grasping reflex and the presence of ischial callosities, which are thickened areas of skin on their buttocks that they use for sitting.

The tribe Atelinae includes the following genera:

* Ateles (spider monkeys)
* Brachyteles (muriquis or woolly spider monkeys)
* Lagothrix (woolly monkeys)
* Oreonax (the yellow-tailed woolly monkey)

These monkeys are native to Central and South America, where they inhabit a variety of forest habitats. They are generally arboreal, spending most of their time in trees, and have a varied diet that includes fruits, leaves, flowers, and insects. Many species of Atelinae are endangered due to habitat loss and hunting.

Arthropod venoms are toxic secretions produced by the venom glands of various arthropods, such as spiders, scorpions, insects, and marine invertebrates. These venoms typically contain a complex mixture of bioactive molecules, including peptides, proteins, enzymes, and small molecules, which can cause a range of symptoms and effects in humans and other animals.

The specific composition of arthropod venoms varies widely depending on the species and can be tailored to serve various functions, such as prey immobilization, defense, or predation. Some arthropod venoms contain neurotoxins that can disrupt nerve function and cause paralysis, while others may contain cytotoxins that damage tissues or hemotoxins that affect the blood and cardiovascular system.

Arthropod venoms have been studied for their potential therapeutic applications, as some of their bioactive components have shown promise in treating various medical conditions, including pain, inflammation, and neurological disorders. However, it is important to note that arthropod venoms can also cause severe allergic reactions and other adverse effects in susceptible individuals, making it essential to exercise caution when handling or coming into contact with venomous arthropods.

Arachnida is a class of joint-legged invertebrate animals that includes spiders, scorpions, mites, and ticks. They are characterized by having two main body segments (the cephalothorax and the abdomen), eight legs, and simple eyes. Most arachnids produce silk, which they use for various purposes such as capturing prey or building shelters.

Arachnids are arthropods, a group that also includes insects, crustaceans, and other related animals. They are found worldwide in diverse habitats, ranging from forests and grasslands to deserts and caves. Many arachnids are predators, feeding on insects and other small animals. Some species are parasites, living on the blood or tissue of other organisms.

Arachnids have a hard exoskeleton made of chitin, which provides protection and support for their soft internal organs. They molt periodically to grow and replace damaged body parts. Arachnids also have a complex reproductive system that involves the transfer of sperm from the male to the female through specialized structures called pedipalps.

While some arachnids are harmless or even beneficial to humans, others can be dangerous or pests. For example, spider bites can cause painful reactions and in rare cases, death. Ticks and mites can transmit diseases such as Lyme disease and scrub typhus. Scorpions can deliver venomous stings that can be fatal to humans. Despite these risks, arachnids play important roles in ecosystems, controlling pests and contributing to nutrient cycling.

Agatoxins are a group of neurotoxins that are derived from the venom of funnel web spiders, specifically in the genus Agelenopsis and Agelena. These toxins primarily target and inhibit the function of voltage-gated calcium channels (VGCCs) found in nerve cells.

Agatoxins can be further divided into subtypes based on their specificity for different VGCC isoforms, such as Agatoxin-I, which selectively binds to P/Q-type VGCCs, and Agatoxin-II, which targets N-type VGCCs.

These toxins have been extensively studied in neuroscience research due to their ability to modulate synaptic transmission and plasticity, making them valuable tools for understanding the molecular mechanisms underlying various neurological processes and diseases. Additionally, there is interest in developing agatoxin-based therapeutics for treating conditions such as chronic pain and epilepsy.

Cannibalism is defined in medical terms as the act or practice of consuming flesh or organs of one's own species as food. It is a term that is often used to describe situations where humans consume the flesh or organs of other humans. Cannibalism can occur in various contexts, including survival situations, cultural practices, and criminal activities.

It is important to note that cannibalism is generally considered taboo in most societies and cultures today. In medical and psychological terms, cannibalism can be associated with a range of negative consequences, such as the transmission of infectious diseases, ethical concerns, and psychological distress. However, it is essential to approach this topic with sensitivity and cultural relativism, recognizing that cultural practices and beliefs may vary widely across different societies and historical periods.

Neurotoxins are substances that are poisonous or destructive to nerve cells (neurons) and the nervous system. They can cause damage by destroying neurons, disrupting communication between neurons, or interfering with the normal functioning of the nervous system. Neurotoxins can be produced naturally by certain organisms, such as bacteria, plants, and animals, or they can be synthetic compounds created in a laboratory. Examples of neurotoxins include botulinum toxin (found in botulism), tetrodotoxin (found in pufferfish), and heavy metals like lead and mercury. Neurotoxic effects can range from mild symptoms such as headaches, muscle weakness, and tremors, to more severe symptoms such as paralysis, seizures, and cognitive impairment. Long-term exposure to neurotoxins can lead to chronic neurological conditions and other health problems.

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19-20 Wikiquote has quotations related to The Golden Spiders. Nero Wolfe - "The Golden Spiders" at IMDb The Golden Spiders: A ... "said a spider to a fly" - had given the spider earrings to Estey as a subtle way of confronting her. Estey murdered Birch when ... "The Golden Spiders" aired January 16, 1981. Roberto Jannone adapted The Golden Spiders for the third episode of the RAI TV ... The Golden Spiders"; CBS Sunday Morning, March 12, 2000 The Golden Spiders: A Nero Wolfe Mystery at The Wolfe Pack, official ...
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The Trap Door Spiders are a literary male-only eating, drinking, and arguing society in New York City, with a membership ... The Trap Door Spiders are fictionalized in L. Sprague de Camp's historical novel The Bronze God of Rhodes (1960), as "The Seven ... Such Spider elements as the rotating presidency and the question put to guests are faithfully represented in the practices of ... Membership of the club was by invitation, and varied as some Trap Door Spiders died or moved away (or in at least one instance ...
... may refer to: San Jose Spiders (NWBL), women's professional basketball team, 2005-2006 San Jose Spiders (AUDL ... 2014-2021 This disambiguation page lists articles associated with the title San Jose Spiders. If an internal link led you here ... former name of Oakland Spiders men's ultimate disc team, ...
... ". AllMusic, Biography by Stephen Howell "Spiders weave new tunes". Toronto Star - Toronto, Ont. Jun 10, 1999 ... Mean Red Spiders are a Canadian alternative rock band from Toronto, Ontario. Their music is largely guitar-based indie rock ... The album Places You Call Home was co-produced by Dave Newfeld with Mean Red Spiders. It was recorded in 1997 and 1998 in the ... The Mean Red Spiders formed in Toronto in September 1993. The original members were lead vocalist Greg Chambers, guitarist ...
As plant and insect life diversified so also did the spider's use of silk. Spiders with spinnerets at the end of the abdomen ( ... They co-existed with a range of spider-like forms which had some, but not all, the characters associated with the true spiders ... Around half of modern spider species belong to the RTA clade, a group of spiders linked by the shared morphological trait of ... ISBN 978-0-9558636-5-3. Picture of spider fossil Dunlop, J. A., Penney, D. & Jekel, D. (2016). A summary list of fossil spiders ...
Spiders at the Australian Museum Spiders in Western Australia Arachne Find a Spider Spiders of Europe and Australia The Top 10 ... tree sheet-web spiders (Cyatholipidae), tree trapdoor spiders (Migidae), tube-web spiders (Segestriidae), two-tailed spiders ( ... legged sac spiders (Liocranidae), spiny trapdoor spiders (Idiopidae), spitting spiders (Scytodidae), swift spiders and ant ... shield spiders (Malkaridae), six-eyed ground spiders (Orsolobidae), slender sac spiders (Cheiracanthiidae), small swift spiders ...
"Spider boys spin web of CHARM / Good friends off-screen too". The New Paper. Singapore. "Fighting Spiders 斗蜘蛛". Media Corp. ... Fighting Spiders is the story of three boys in the 1960s - Soon Lee (Edwin Goh), Charlie (Liang Shijie Jason) and Peter ( ... Fighting Spiders is a drama television program from Singapore that premiered on MediaCorp Channel 5 on 14 April 2009. The ... Fighting Spiders on MediaCorp Channel 5 v t e (Singaporean television series, 2009 Singaporean television series debuts, 2009 ...
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Jump these hair-raising spiders onto and over your unsuspecting Halloween party guests! Push them down to make them lurch, leap ... Scatter these 2" plastic spiders around as party decorations in your haunted house, pass them out as party favors or drop them ... Jump these hair-raising spiders onto and over your unsuspecting Halloween party guests! Push them down to make them lurch, leap ...
Browse the Marvel Comics issue Spider-Girl (2010) #6. Learn where to read it, and check out the comics cover art, variants, ... Guest starring Spider-Man! Spider-Girl is fresh off her battle with the grim huntress, Ana Kravinoff, and determined to do a ... Spider-Girl is fresh off her battle with the grim huntress, Ana Kravinoff, and determined to do a little hunting of her own... ...
Watch Spider-Man 2 on NBC.com and the NBC App. After a failed nuclear fusion experiment, Dr. Otto Octavius transforms into Dr. ...
I made a spider that glows in the dark so I can see it in the dark See the full video here: ... ...
Find tips on how to treat spider bites ... Spider bites generally garner a reaction similar to that of a ... Black Widow Spider (Occupational Safety and Health Administration) - PDF * Brown Recluse Spider (Occupational Safety and Health ... Article: Its Not a Spider Bite-Its MRSA! * Article: Brown spiders (Loxosceles) are taking hold in Pernambuco, Brazil: a case ... Occasionally, spider bites can cause allergic reactions. And bites by the venomous black widow and brown recluse spiders can be ...
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... jumping spiders leap, crab spiders ambush, wolf spiders give chase and web-weaving spiders entrap. No other group of animals ... the zebra jumping spider, hunting on walls and fences; the common house spider; the northern black widow spider, feeding on ... Spiders eat tons of insects every year.. Spiders live among us in almost every conceivable habitat. Evolution has equipped them ... Spider silk is also used by some birds for nest-building. Spider webs can contain more than 60 meters of silk, some contain ...
Find large photos and descriptions of 5 different varieties of arborvitae.. Need a landscape screen plant? Here are some great choices.
Temple of the Spider God will follow the six preceding titles in the series on the iPhone, iPod Touch and iPad. The first five ... Temple of the Spider God Seventh in the Gamebook Adventures series being penned by Jonathan Green. ... Gamebook Adventures 7: Temple of the Spider God will be released around July 2011. ...
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Spider guts, and our own, use squeezing motions to help break up food and move it along the digestive tract. In sea spiders, ... That helps to explain why, unlike true spiders, sea spiders guts extend out of the abdomen and into their legs-it probably ... Normal spiders and insects in general dont have veins or blood like you and I. Instead, a substance called hemolymph just sort ... The sea spiders weird way of pumping hemolymph is a great example of how nature can find many different ways to solve a ...
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But at the beginning, spider-webbers, or spiders for short, can be very difficult to detect because they are frankly very good ... 5 Signs of Toxic Spider-Webbing in a Relationship 3. Weaponizing what you reveal to them. Posted October 31, 2023 , Reviewed ... People who perform spider-webbing can be sort of the "final boss" of dating, masters of playing you as if you were in a video ... Of course, someone who spider-webs you is typically not going to say, "Nice to meet you. I am going charm the pants off of you ...
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An extraordinarily well-preserved fossil of a jumping spider is a first for the southern hemisphere. Its close cousins live in ... A fossil jumping spiders 15-million-year journey An extraordinarily well-preserved fossil of a jumping spider is a first for ... "The fossilised jumping spider belonged to Simaetha, a genus of jumping spiders that still exists. From DNA studies, we knew the ... the fossil jumping spiders morphology (how it looks). *a map of where similar spiders live today, created using specimens held ...
Widow spiders have a bad rap for their venomous bites, which can be very painful to humans but rarely cause death. The species ... The spiders sense each other using innervated hairs on their body and legs. When the brown widows "got a whiff" of the black ... When subadult spiders were put in proximity of one another, the brown widows killed and ate the black widows in 80% of ... Bit(e) by bit(e), in a pattern first noticed a decade ago, the black widow spiders are being displaced by the interlopers. The ...
How Can People Overcome Their Fear of Spiders? ... Spider webs are stronger and tougher by weight than steel.. * ... "Its easier for people with a fear of spiders to face a virtual spider than a real one," said Anja Zimmer, the studys lead ... Of course, the spiders they mean are the virtual kind, as in augmented reality (AR), and they appear on your phone as images ... Spiders typically work alone, but some establish colonies consisting of thousands of members that cast huge webs to catch prey ...
Spider veins are a condition like varicose veins, but they happen in smaller veins that are closer to the surface. Spider veins ... Microsclerotherapy can be used to treat spider veins and smaller varicose veins. ...
The new protein is created from parts of a toxin from the reaper spider ... New engineered spider protein could be the start of a new generation of anti-venom vaccines, potentially saving thousands of ... Spider glue is a modified form of spider silk that keeps a spiders prey stuck in its web, and it could have ... ... Spider Venom Is a Dangerous Cocktail. May 2, 2019 Spider venom does not only consist of neurotoxins but also of a multitude of ...
Spider-Man: No Way Home utilized surprising CGI alongside old-school practical effects as the Marvel hero battled Doctor ... Narrator: Spider-Man also has to rescue the assistant vice chancellor from her car as it teeters over the edge of the bridge. ... Narrator: Spider-Man also has to rescue the assistant vice chancellor from her car as it teeters over the edge of the bridge. ... Unlike in 2004s "Spider-Man 2," Alfred Molina did not wear a pair of puppeteered claws on set. While the actor now had more ...
Spider-man Far From Home. He seemed to be extremely excited as he shared the news on Instagram. ... While we dont get to see him in his red and blue costume, we did get a glimpse of THAT Spider-man moment where he realizes his ... Tom Holland and Zendaya wrapped up their latest project: Spider-Man Far From Home. He seemed to be extremely excited as he ... How do you feel about Toms reprising his role as Spider-man? Let us know in the comments. ...
  • And bites by the venomous black widow and brown recluse spiders can be very dangerous to people. (medlineplus.gov)
  • There are ~58 spider species in Florida (5 of these are venomous). (ufl.edu)
  • See Arthropod Envenomation: From Benign Bites to Serious Stings and Venomous Spider Bites: Keys to Diagnosis and Treatment , Critical Images slideshows, for help identifying and treating various envenomations. (medscape.com)
  • Almost all spiders are venomous. (msdmanuals.com)
  • Although spider bites are common in many parts of the United States, most domestic spiders are not substantially venomous to man. (cdc.gov)
  • Reliance on a single molecular toxin scaffold by nearly all spiders is in complete contrast to most other venomous animals that have recruited into their venoms diverse toxins with independent origins. (bvsalud.org)
  • Though many people are afraid of spiders, they rarely bite people unless threatened. (medlineplus.gov)
  • You Shouldn't Be Afraid of Spiders Much of the fear people feel toward spiders is due to misinformation largely spread through the internet. (medscape.com)
  • While spiders are often feared, they are generally non-aggressive and provide essential ecosystem services, such as controlling pest insects in homes, gardens, and agricultural crops. (ufl.edu)
  • Spiders eat tons of insects every year. (naturecanada.ca)
  • Normal spiders and insects in general don't have veins or blood like you and I. Instead, a substance called hemolymph just sort of washes over their cells to deliver oxygen and energy. (popsci.com)
  • Clinically, the predominant effects are neurological and autonomic, in contrast to the dermonecrotic local effects associated with spiders causing necrotic arachnidism (eg, brown spiders from the genus Loxosceles ). (medscape.com)
  • By Samm Wehman Epstein and Lisa Taylor April 13, 2023 Florida has a rich diversity of spiders that vary greatly in body shape, size, color, hunting strategy, and habitat. (ufl.edu)
  • Spider-Man 2 seems like a pretty likely 2023 game. (pcmag.com)
  • And there's now a term for this strategy that circulating on social media just in time for Halloween 2023: spider-webbing. (psychologytoday.com)
  • The fact sheet, available at https://edis.ifas.ufl.edu/publication/IN1366, provides information on species biology along with images and descriptions for spiders across 15 families. (ufl.edu)
  • The covered outdoor porches here are both ubiquitous and a favored environment for several spider species. (ufl.edu)
  • Many species of birds and other predators feed exclusively on spiders. (naturecanada.ca)
  • Spiders can be daunting to identify as the colour of a species is often quite variable, even when mature, while immature spiders are sometimes very different than adults. (naturecanada.ca)
  • This species of sea spider ripples its digestive tract to deliver oxygen to the cells in its body. (popsci.com)
  • While staring at sea spider blood and guts under a microscope (for some species, you can see right into their living bodies), biologist H. Arthur Woods of the University of Montana, Missoula, noticed that the arthropod's heart beats weakly. (popsci.com)
  • In a series of experiments and observations, he and his colleagues confirmed that hypothesis in 12 species of sea spider, showing that their guts essentially function as cardiovascular systems. (popsci.com)
  • The term widow spider is preferred because not all species in the genus Latrodectus are black. (medscape.com)
  • Widow spiders belong to the genus Latrodectus and are found throughout the world. (medscape.com)
  • In the United States, arguably the most famous is the Southern black widow spider ( Latrodectus mactans mactans ). (medscape.com)
  • The redback spider (Latrodectus hasselti ) is endemic to Australia. (medscape.com)
  • The white widow spider ( Latrodectus pallidus ) can be found in North Africa, Central Asia, and the Middle East. (medscape.com)
  • The button spider ( Latrodectus indistinctus ) is one of several widow spiders native to South Africa. (medscape.com)
  • Other widow spiders are generally black but may have red spots, such as Latrodectus tredecimguttatus, or a dorsal red stripe, such as the redback spider. (medscape.com)
  • Female black widow spider, Latrodectus mactans, in the process of spinning her web on a tree branch. (medscape.com)
  • Black widow spider (Latrodectus mactans) and offspring. (medscape.com)
  • A redback spider (Latrodectus hasseltii) female, found in suburban Sydney, New South Wales, Australia. (medscape.com)
  • The best known exceptions are widow spiders (Latrodectus spp. (cdc.gov)
  • Most spider bites are harmless. (medlineplus.gov)
  • Occasionally, spider bites can cause allergic reactions. (medlineplus.gov)
  • Spider bites cause fewer than three deaths a year in the United States, usually in children. (msdmanuals.com)
  • Serious injuries from spider bites can include severe wounds caused by the tissue-destroying venom of brown spiders and bodywide poisoning caused by the nerve-toxic venom of widow spiders. (msdmanuals.com)
  • Brown spider bites are treated by caring for the wound. (msdmanuals.com)
  • Widow spider bites are treated by relieving symptoms and sometimes giving antivenom. (msdmanuals.com)
  • Many people mistake skin infections, some potentially serious (such as methicillin-resistant Staphylococcus aureus [MRSA] infections), or other disorders for spider bites. (msdmanuals.com)
  • In 1994, poison-control center log reports compiled by the American Association of Poison Control Centers listed 9418 spider bites ( Table 1 ) (1). (cdc.gov)
  • The largest category (59.5%) was animal bites and stings: 25.4% undiagnosed, 19.7% scorpion stings, 7.6% bee, spider or wasp stings and 6.8% snake bites. (who.int)
  • including the black widow L. mactans) and brown spiders (Loxesceles spp. (cdc.gov)
  • However, cases of arachnid envenomation from the hobo spider (Tegenaria agrestis) are being reported increasingly in the Pacific Northwest. (cdc.gov)
  • an orphaned boy, who - in his awkward teenage years - encountered a radioactive spider whose bite endowed him with an assemblage of superhuman abilities. (joblo.com)
  • Once bitten (and after waking up from a wicked spider bite hangover) Peter developed the powers of superhuman strength, speed, agility, stamina, reflexes, and endurance, as well as the ability to cling to and climb most surfaces. (joblo.com)
  • The bite of a widow spider usually causes a sharp pain, somewhat like a pinprick, followed by a dull, sometimes numbing, pain in the area around the bite. (msdmanuals.com)
  • The bite of a brown spider may cause little or no immediate pain, but some pain develops in the area around the bite within about an hour. (msdmanuals.com)
  • There is no way to identify a particular spider on the basis of its bite mark. (msdmanuals.com)
  • Is it a spider bite? (cdc.gov)
  • Centers for Disease Control and Prevention (U.S.) "Is it a spider bite? (cdc.gov)
  • An eschar on her leg was consistent with necrosis from a spider bite. (cdc.gov)
  • Spider mums are not typically sold at garden centers because they're later bloomers, flowering in October to November. (hgtv.com)
  • A Black Widow Spider Bit Me! (medlineplus.gov)
  • The adult female black widow spider is approximately 2 cm in length and shiny black with a red-orange hourglass or spot on the ventral abdomen. (medscape.com)
  • By James Gathany (http://phil.cdc.gov/phil/) [Public domain], courtesy of Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Black_widow_spider_9854_lores.jpg). (medscape.com)
  • CC BY 2.5 (https://creativecommons.org/licenses/by/2.5)], courtesy of Wikimedia Commons (https://commons.wikimedia.org/wiki/File:Black_Widow_Spider_07-04-20.jpg). (medscape.com)
  • Note that this is only a remaster of the original Spider-Man, not the Miles Morales spin-off from 2020. (pcmag.com)
  • Without spiders, insect populations around the world would explode, food crops would be obliterated, and insect-borne diseases would skyrocket. (naturecanada.ca)
  • Evolution has equipped them with a myriad of techniques for capturing insect prey: jumping spiders leap, crab spiders ambush, wolf spiders give chase and web-weaving spiders entrap. (naturecanada.ca)
  • Most spiders lay their eggs in a finely woven silk web and take off, letting the eggs fend for themselves - but not the wolf spider. (naturecanada.ca)
  • Wolf spiders strap their eggs to themselves and carry them around for up to 10 days. (naturecanada.ca)
  • Once the little ones hatch, female wolf spiders continue to care for them, even letting them hitch a free ride on their backs until the young are old enough to care for themselves. (naturecanada.ca)
  • That helps to explain why, unlike true spiders, sea spiders' guts extend out of the abdomen and into their legs-it probably helps to keep the nutrients moving. (popsci.com)
  • Widow spiders are recognized by a red or orange hourglass-shaped marking on the abdomen. (msdmanuals.com)
  • in contrast, spiders rely on a single class of proteins , known as disulfide -rich peptides , to create their deadly venom cocktail. (bvsalud.org)
  • In the language of flowers, white spider mums convey the idea of purity and truth, which also makes them a choice for fall bridal bouquets. (hgtv.com)
  • However, these identifying marks can be difficult to discern, and the spider is rarely retrieved intact, so the diagnosis is usually uncertain and based on symptoms. (msdmanuals.com)
  • A closer look at spider venoms hints at an intriguing evolutionary history which has been rarely examined so far. (bvsalud.org)
  • If you are bitten by a spider, you may see a reaction similar to that of a bee sting, including redness, pain and swelling at the site. (medlineplus.gov)
  • Spiders live among us in almost every conceivable habitat. (naturecanada.ca)
  • A Brown Recluse Spider Bit Me! (medlineplus.gov)
  • Brown spiders are present in the Midwest and South Central United States, not in the coastal and Canadian border states, except when imported on clothing or luggage. (msdmanuals.com)
  • Wounds suspected of being caused by the brown spider are often caused by other problems, some potentially more serious. (msdmanuals.com)
  • Brown spiders have a violin-shaped marking on their back. (msdmanuals.com)
  • She rolled up the leg of her pants and found a crushed brown spider, subsequently identified as T. agrestis. (cdc.gov)
  • All spiders are poisonous, but 99% of them are harmless to humans. (naturecanada.ca)
  • They sit in the centre of these spirally-ringed sticky silk webs in sunny but sheltered spots, waiting for their prey, which sticks to the spider net. (naturecanada.ca)
  • The majority of spiders rely on their venom to defend themselves, to hunt, or both. (bvsalud.org)
  • We found that one of the key features that gives spider silk its strength is the hydrogen bonds are arranged regularly in space and at a very high density," said Knowles. (eurekalert.org)
  • The researchers successfully replicated the structures found on spider silk by using soy protein isolate, a protein with a completely different composition. (eurekalert.org)
  • The remarkably durable, tough and flexible spider silk is currently being used to drive advances in medicine, and bioengineers have developed ways to turn the protein found in spider silk into a biodegradable adhesive to repair broken bones. (naturecanada.ca)
  • This spider was found on a farm in the US state of Georgia. (medscape.com)
  • Finasteride has been found in spiders (article Richmond et al. (janusinfo.se)
  • This downloadable educational coloring book focused on spiders provides a creative way for people of all ages to appreciate the beauty and intrigue of spiders. (ufl.edu)
  • People who perform spider-webbing can be sort of the "final boss" of dating, masters of playing you as if you were in a video game. (psychologytoday.com)
  • People who try to spider-web you typically have major issues. (psychologytoday.com)
  • The answer is probably busy spider-webbing other people. (psychologytoday.com)
  • In the spider, determination of the dorsal-ventral body (DV) axis depends on the interplay of the dorsal morphogen encoding gene decapentaplegic (Dpp) and its antagonist, short gastrulation (sog), a gene that is involved in the correct establishment of ventral tissues. (lu.se)
  • Recent work demonstrated that the forkhead domain encoding gene FoxB is involved in dorsal-ventral axis formation in spider limbs. (lu.se)
  • FoxB thus represents a general player in the establishment of dorsal-ventral structures during spider ontogeny. (lu.se)
  • As part of their protein research, Knowles and his group became interested in why materials like spider silk are so strong when they have such weak molecular bonds. (eurekalert.org)
  • In a spider, the silk protein is dissolved in an aqueous solution, which then assembles into an immensely strong fibre through a spinning process which requires very little energy. (eurekalert.org)
  • A search engine spider is the piece of software which crawls your website, indexing the content in the search engine's database. (hotscripts.com)
  • As the lineages under evaluation constitute nearly 60% of extant spiders , our findings provide fascinating insights into the early evolution and diversification of the spider venom arsenal. (bvsalud.org)
  • This bridal language doesn't translate from American to European nations, where spider mums are typically associated with death and graveside remembrance bouquets. (hgtv.com)
  • Of course, someone who spider-webs you is typically not going to say, "Nice to meet you. (psychologytoday.com)
  • The researchers, from the University of Cambridge, created a polymer film by mimicking the properties of spider silk, one of the strongest materials in nature. (eurekalert.org)
  • Because all proteins are made of polypeptide chains, under the right conditions we can cause plant proteins to self-assemble just like spider silk," said Knowles. (eurekalert.org)
  • In a way we've come up with 'vegan spider silk' - we've created the same material without the spider. (eurekalert.org)
  • Is Spider Silk Stronger Than Steel? (schooltube.com)
  • Spiders use silk for lining their burrows, protecting their egg sacs, anchoring themselves with safety lines, and of course, building webs - either orb webs, mesh webs, cobwebs, sheet webs or funnel webs. (naturecanada.ca)
  • Spider silk is also used by some birds for nest-building. (naturecanada.ca)
  • Spider webs can contain more than 60 meters of silk, some contain more than 3,000 attachment points, and spiders eat part of their old webs to produce silk for new ones, so they are recyclers by nature. (naturecanada.ca)
  • A spider begins by attaching a single strand of silk horizontally between two supports. (naturecanada.ca)
  • Therefore, a specific diagnosis can be made only if the spider can be identified. (msdmanuals.com)
  • Spider mums take their common name from long, narrow, drooping petals, which look like a spider's legs. (hgtv.com)
  • It accompanies An introduction to Some Common and Charismatic Florida Spiders, a facts sheet highlighting some of the most commonly encountered spiders in Florida and some less common, but particularly charismatic, groups. (ufl.edu)
  • The most common spiders in our area are the orbweavers. (naturecanada.ca)
  • This ancestral toxin was present 375 million years ago in the last common ancestor of modern-day spiders . (bvsalud.org)
  • Stake spider mums as they grow, because the flower buds can create a top-heavy plant. (hgtv.com)
  • If you want large blooms (some spider mum flowers can reach 6 inches across), let each plant develop just one flower bud. (hgtv.com)
  • Cutaneous manifestations of cirrhosis include jaundice, spider angiomata, skin telangiectasias ("paper money skin"), palmar erythema, white nails, disappearance of lunulae, and finger clubbing, especially in the setting of hepatopulmonary syndrome. (medscape.com)
  • A technique is proposed for individually marking orb-web spiders aiming at facilitating the identification of the individuals on their webs. (bvsalud.org)
  • You don't need to rush out and spend hundreds of dollars on a store bought piece to wow your neighbors though, in these 4 videos you'll see how you could build a giant spider in a few creative ways. (makezine.com)
  • When ordering spider mums, you'll receive rooted cuttings for planting. (hgtv.com)
  • Hamutahl Cohen November 3rd, 2021 As an extension agent in SW Florida, I frequently receive inquiries about spiders in the lanai. (ufl.edu)
  • To receive SPIDER, please contact Walter Alarcon . (cdc.gov)
  • The analyses allowed the identification of 78 new superfamilies of spider toxins . (bvsalud.org)
  • Created by Stan Lee and Steve Ditko, the character of Spider-Man made his debut inside the pages of Amazing Fantasy #15 in the year 1962. (joblo.com)