|
Andricus Kollari
''Andricus kollari'', also known as the marble gall wasp, is a parthenogenesis, parthenogenetic species of wasp which causes the formation of marble galls on oak trees. Synonyms for the species include ''Cynips kollari'', ''Andricus quercusgemmae'', ''A. minor'', ''A. indigenus'' and ''A. circulans''. Description Adult ''Andricus kollari'' are dark brown, and about in length. It has alternating sexual and asexual generations, each often taking two years to complete. Like all gall wasps, it causes the formation of parasitic galls on trees in which it lays its larvae. In May or June, a sexual female lays her eggs in the developing buds of susceptible oak trees using her ovipositor. Chemicals produced by both the adult and developing wasps cause the formation of a gall. Pedunculate oak (''Quercus robur''), sessile oak (''Quercus petraea, Q. petraea'') and the hybrid ''Quercus × rosacea'' can all be parasitized. The host trees are often immature or retarded specimens; galls are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theodor Hartig
Theodor Hartig (21 February 1805 – 26 March 1880) was a German forestry biologist and botanist. Biography Hartig was born in Dillenburg. He was educated in Berlin (1824–1827), and was successively lecturer and professor of forestry at the University of Berlin (1831–1838) and at the Carolinum, Braunschweig. Hartig was the first to discover and name the sieve tube element cells (as ''Siebfasern'' - sieve fibres and ''Siebröhren'' - sieve tubes) in 1837. His zoologist author abbreviation is Hartig. He described many gall wasp species. In 1842, Theodor Hartig described what is now known as the Hartig net, a network of fungal hyphae that penetrate feeder roots and surround epidermal cells. The Hartig net is part of the structure of ectomycorrizae, mutualistic symbioses between fungi and plant roots. He died in Braunschweig. Works *1836 Forstliches und forstnaturwissenschaftliches Conversations-Lexicon. Georg Ludwig Hartig and Theodor Hartig*1840. Über die Familie der Gallw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lesser Spotted Woodpecker
The lesser spotted woodpecker (''Dryobates minor'') is a member of the woodpecker family Picidae. It was formerly assigned to the genus '' Dendrocopos'' (sometimes incorrectly spelt as ''Dendrocopus''). Some taxonomic authorities continue to list the species there. The range of the lesser spotted woodpecker is the Palearctic region, but several subspecies are recognised. Taxonomy The lesser spotted woodpecker was listed by the Swedish naturalist Carl Linnaeus in 1758 in the 10th edition of his ''Systema Naturae'' under the binomial name ''Picus minor''. The species was moved to the genus '' Dendrocopos'' by the German naturalist Carl Ludwig Koch in 1816. A molecular phylogenetic study published in 2015 based on nuclear and mitochondrial DNA sequences found that the species placed in the genus ''Dendrocopos'' did not form a monophyletic group. In the revised generic classification, the lesser spotted woodpecker was placed in the resurrected genus ''Dryobates'', that had originall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cola-nut Gall
Cola-nut gallsDarlington, Arnold (1975) ''The Pocket Encyclopaedia of Plant Galls in Colour.'' Pub. Blandford Press. Poole. . P. 155. develop as a chemically induced distortion of leaf axillary or terminal buds on pedunculate oak (''Quercus robur'') or sessile oak (''Quercus petraea'') trees, caused by the agamic gall wasp ''Andricus lignicola'' ( Hartig, 1840) which lays single eggs within leaf buds using their ovipositor. A previous name or synonym for the species ''A. lignicola'' is ''A. lignicolus'' and ''A. venheurni''. The physical appearance of the galls The galls are found in small groups, which however do not coalesce, distinguishing them from the oak marble gall (''Andricus kollari''); in addition the shape is ovoid rather than spherical and the surface is scaly rather than smooth. It grows up to about 10 x 8 mm and is at first green, rapidly changing to grey-brown, with light red patches where the original bud scales have separated. It is hard and firm, but doe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andricus Grossulariae
''Andricus grossulariae'' is a gall wasp species inducing agamic acorn cup galls on oak tree acorn cups and sexual phase galls on catkins. Synonyms include ''Andricus fructuum'' (Trotter, 1899), ''Andricus gemellus'' (Belizin & Maisuradze, 1961), ''Andricus intermedius'' (Tavares, 1922), ''Andricus mayri'' (Wachtl, 1879) and ''Cynips panteli'' (Kieffer, 1897). Galls Acorn cup galls develop as a chemically induced distortion of the growing acorn cups on oak trees, caused by gall wasps which lay eggs within the tissues of the acorn cup. The sexual phase appears on catkins as rounded structures (6 mm × 3–4 mm) possessing a characteristic point, and when young are covered with fine hairs. The galls, shiny and hard, turn red in colour and then black or dark purple. The asexual or parthenogenetic phase, about 10 mm across, develops on acorn cups of English oak ''Q. robur'' and sessile oak ''Q. petraea''. The galls, formed of flattened projections, often enclose the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pannage
Pannage is the practice of releasing livestock- pigs in a forest, so that they can feed on fallen acorns, beechmast, chestnuts or other nuts. Historically, it was a right or privilege granted to local people on common land or in royal forests across much of Europe. H. R. Loyn, ''Anglo-Saxon England and the Norman Conquest'', 2nd ed. 1991:369. The practice was historically referred to as ''Eichelmast'' or ''Eckerich'' in German-speaking Europe while the fee to feed one's livestock in such a way was historically referred to as ''žirovina'' in Croatia and Slovenia. Pannage had two useful purposes in the Middle Ages. While rooting around looking for nuts, pigs also turned the soil and broke it. Pig-rooting prevented soil compaction and released nutrients for plant growth. It also fattened pigs for slaughter. Especially in the eastern shires of England, pannage was so prominent a value in the economic importance of woodland that it was often employed, as in ''Domesday Book'' (10 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemorrhoid
Hemorrhoids (or haemorrhoids), also known as piles, are vascular structures in the anal canal. In their normal state, they are cushions that help with stool control. They become a disease when swollen or inflamed; the unqualified term ''hemorrhoid'' is often used to refer to the disease. The signs and symptoms of hemorrhoids depend on the type present. Internal hemorrhoids often result in painless, bright red rectal bleeding when defecating. External hemorrhoids often result in pain and swelling in the area of the anus. If bleeding occurs, it is usually darker. Symptoms frequently get better after a few days. A skin tag may remain after the healing of an external hemorrhoid. While the exact cause of hemorrhoids remains unknown, a number of factors that increase pressure in the abdomen are believed to be involved. This may include constipation, diarrhea, and sitting on the toilet for long periods. Hemorrhoids are also more common during pregnancy. Diagnosis is made by lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gospel Of Judas
The Gospel of Judas is a non-canonical religious text. Its content consists of conversations between Jesus and his disciples, especially Judas Iscariot. The only copy of it known to exist is a Coptic language text that is part of the Codex Tchacos, which has been radiocarbon dated to 280 AD, plus or minus 60 years. Like the Gnostic texts of the Nag Hammadi library, this version is believed by most biblical scholars to be a translation of an original which was composed in the Greek language by Gnostic Christians in the 2nd century. Rejected as heresy by the early Christian church and lost for 1700 years, the document was rediscovered in Egypt in the 1970s. After undergoing extensive restoration and preservation, an English translation was first published in early 2006 by the National Geographic Society. History Authorship Like the four canonical gospels, the Gospel of Judas is anonymous. Date In early January 2005, researchers at the Arizona Accelerator Mass Spectrometr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dead Sea Scrolls
The Dead Sea Scrolls, also called the Qumran Caves Scrolls, are a set of List of Hebrew Bible manuscripts, ancient Jewish manuscripts from the Second Temple period (516 BCE – 70 CE). They were discovered over a period of ten years, between 1946 and 1956, at the Qumran Caves near Ein Feshkha in the West Bank, on the northern shore of the Dead Sea. Dating from the 3rd century BCE to the 1st century CE, the Dead Sea Scrolls include the oldest surviving manuscripts of entire books later included in the biblical canons, including Deuterocanonical books, deuterocanonical manuscripts from late Second Temple Judaism and extrabiblical books. At the same time, they cast new light on the emergence of Christianity and of Rabbinic Judaism. Almost all of the 15,000 scrolls and scroll fragments are held in the Shrine of the Book at the Israel Museum located in Jerusalem. The Israeli government's custody of the Dead Sea Scrolls is disputed by Jordan and the Palestinian National Authority, P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iron Gall Ink
Iron gall ink (also known as common ink, standard ink, oak gall ink or iron gall nut ink) is a purple-black or brown-black ink made from iron salts and tannic acids from vegetable sources. It was the standard ink formulation used in Europe for the 1400-year period between the 5th and 19th centuries, remained in widespread use well into the 20th century, and is still sold today. Preparation and use The ink was traditionally prepared by adding some iron(II) sulfate (iron, FeSulfate, SO4) to a solution of tannic acid, but any iron ion donor can be used. The Tannic acid#Quercitannic and gallotannic acids, gallotannic acid was usually extracted from Oak apple, oak galls or galls of other trees, hence the name. Fermentation (biochemistry), Fermentation or hydrolysis of the extract releases glucose and gallic acid, which yields a darker purple-black ink, due to the formation of iron gallate. The fermented extract was combined with the iron(II) sulfate. After filtering, the resulting p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tannic Acid
Tannic acid is a specific form of tannin, a type of polyphenol. Its weak acidity (Acid dissociation constant, pKa around 6) is due to the numerous phenol groups in the structure. The chemical formula for commercial tannic acid is often given as C76H52O46, which corresponds with decagalloyl glucose, but in fact it is a mixture of polygalloyl glucoses or polygalloyl quinic acid esters with the number of gallic acid, galloyl moieties per molecule ranging from 2 up to 12 depending on the plant source used to extract the tannic acid. Commercial tannic acid is usually extracted from any of the following plant parts: Tara pods (''Caesalpinia spinosa''), gallnuts from ''Rhus semialata'' or ''Quercus infectoria'' or Sicilian sumac leaves (''Rhus coriaria''). According to the definitions provided in external references such as international pharmacopoeia, Food Chemicals Codex and FAO-WHO tannic acid monograph only tannins obtained from the above-mentioned plants can be considered as tanni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sycophila
''Sycophila'' is a genus of wasp in the family Eurytomidae that associates with figs and galls of various insects such as gall wasps and gall midges. It can be distinguished from other eurytomid genera by the elongate petiole, the gaster often being laterally compressed, and the forewing having a broadened marginal vein and dark brown maculae. ''Sycophila'' has a cosmopolitan distribution In biogeography, a cosmopolitan distribution is the range of a taxon that extends across most or all of the surface of the Earth, in appropriate habitats; most cosmopolitan species are known to be highly adaptable to a range of climatic and en .... Species There are currently around 120 described species. References Eurytomidae Hymenoptera genera Taxa named by Francis Walker (entomologist) {{Chalcidoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasite
Parasitism is a Symbiosis, close relationship between species, where one organism, the parasite, lives (at least some of the time) on or inside another organism, the Host (biology), host, causing it some harm, and is Adaptation, adapted structurally to this way of life. The entomologist E. O. Wilson characterised parasites' way of feeding as "predators that eat prey in units of less than one". Parasites include single-celled protozoans such as the agents of malaria, sleeping sickness, and amoebic dysentery; animals such as hookworms, lice, mosquitoes, and vampire bats; fungi such as Armillaria mellea, honey fungus and the agents of ringworm; and plants such as mistletoe, dodder, and the Orobanchaceae, broomrapes. There are six major parasitic Behavioral ecology#Evolutionarily stable strategy, strategies of exploitation of animal hosts, namely parasitic castration, directly transmitted parasitism (by contact), wikt:trophic, trophicallytransmitted parasitism (by being eaten), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
