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Herbig–Haro Object
Herbig–Haro (HH) objects are bright patches of nebulosity associated with newborn stars. They are formed when narrow jets of partially ionised gas ejected by stars collide with nearby clouds of gas and dust at several hundred kilometres per second. Herbig–Haro objects are commonly found in star-forming regions, and several are often seen around a single star, aligned with its rotational axis. Most of them lie within about one parsec (3.26 light-years) of the source, although some have been observed several parsecs away. HH objects are transient phenomena that last around a few tens of thousands of years. They can change visibly over timescales of a few years as they move rapidly away from their parent star into the gas clouds of interstellar space (the interstellar medium or ISM). Hubble Space Telescope observations have revealed the complex evolution of HH objects over the period of a few years, as parts of the nebula fade while others brighten as they collide with the clu ...
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Hartmann House Preparatory School
Hartmann House Preparatory School (or Hartmann House, also referred to as HH) is an independent, preparatory, day school for boys in Harare, Zimbabwe. The school was founded in 1957 and named after Fr Hartmann SJ, a chaplain to the Pioneer Column who lived at St. George's College, Harare. Hartmann House Preparatory School is a member of the Association of Trust Schools (ATS) and the Head is a member of the Conference of Heads of Independent Schools in Zimbabwe (CHISZ). History In 1957, 30 years after St George's College relocated to Salisbury (now Harare), it was decided to build a separate preparatory school on the newly acquired land near the Borrowdale Road. It was realised that junior boys had need of quite different teaching styles and care as compared to the senior boys. A fine building was opened as Hartmann House in 1957. It had three Jesuit priests on the staff- Fr Farwell as housemaster with Fr Nixon and Fr Walsh plus some lay teachers. There were 6 classes of 25 ...
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Hedgehog Signaling Pathway
The Hedgehog signaling pathway is a signaling pathway that transmits information to embryonic cells required for proper cell differentiation. Different parts of the embryo have different concentrations of hedgehog signaling proteins. The pathway also has roles in the adult. Diseases associated with the malfunction of this pathway include cancer. The Hedgehog signaling pathway is one of the key regulators of animal development and is present in all bilaterians. The pathway takes its name from its polypeptide ligand, an intracellular signaling molecule called Hedgehog (''Hh'') found in fruit flies of the genus ''Drosophila''; fruit fly larva lacking the ''Hh'' gene are said to resemble hedgehogs. ''Hh'' is one of Drosophila's segment polarity gene products, involved in establishing the basis of the fly body plan. Larvae without ''Hh'' are short and spiny, resembling the hedgehog animal. The molecule remains important during later stages of embryogenesis and metamorphosis. Mamm ...
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Hakainde Hichilema
Hakainde Hichilema (born 4 June 1962) is a Zambian businessman, farmer, and politician who is the seventh and current president of Zambia since 24 August 2021. After having contested five previous elections in 2006, 2008, 2011, 2015 and 2016, he won the 2021 presidential election with over 59% of the vote. He has led the United Party for National Development since 2006 following the death of the party founder Anderson Mazoka. Prior to his election, Hichilema was a major opponent of Edgar Lungu, the President of Zambia from 2015 to 2021. On 11 April 2017, Hichilema was arrested and charged with treason, a move that was seen as an illegitimate act by Lungu to silence a political rival. The arrest and charge were widely condemned, with protests held in Zambia and abroad, demanding Hichilema's release and condemning the increasing authoritarianism of Lungu's regime. Hichilema was released from prison on 16 August 2017, and the charge of treason was dropped. Early life and ...
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HH Ferry Route
HH may refer to: Organizations * Happy Hippie Foundation, a non-profit organization founded by Miley Cyrus * Hartmann House Preparatory School, an independent preparatory school in Harare, Zimbabwe * Heirs Holdings, a Nigerian conglomerate with diversified interests * Helly Hansen, a Norwegian brand specializing in clothing and gear for oceans and mountains * Heywood Hill, a bookshop in London Science and technology * Hh, a signalling molecule in Drosophila named for the Hedgehog signaling pathway * hh blood group, a rare blood type * Henderson–Hasselbalch equation, in biology and chemistry * Herbig–Haro object, in astronomy * Hitchhiker Program, a NASA program established in 1984 * Hodgkin–Huxley model, an electrical model of neurons * Microsoft Compiled HTML Help (hh.exe) * Hereditary haemochromatosis Transportation * HH (Court Street Shuttle) a defunct line on the New York City Subway from 1936 to 1946 * HH (Rockaway Shuttle), from 1962 to 1972 * HH Ferry route be ...
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Brassiere Cup Size
Bra size (also known as brassiere measurement or bust size) indicates the size characteristics of a bra. While there are a number of bra sizing systems in use around the world, the bra sizes usually consist of a number, indicating the size of the band around the woman's torso, and one or more letters that indicate the breast cup size. Bra cup sizes were invented in 1932 while band sizes became popular in the 1940s. For convenience, because of the impracticality of determining the size dimensions of each breast, the volume of the bra cup, or ''cup size'', is based on the difference between band length and over-the-bust measurement. Manufacturers try to design and manufacture bras that correctly fit the majority of women, while individual women try to identify correctly fitting bras among different styles and sizing systems. The shape, size, position, symmetry, spacing, firmness, and sag of individual women's breasts vary considerably. Manufacturers' bra size labelling systems v ...
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Hereditary Haemochromatosis
Hereditary haemochromatosis type 1 (HFE-related Hemochromatosis) is a genetic disorder characterized by excessive intestinal absorption of dietary iron, resulting in a pathological increase in total body iron stores. Humans, like most animals, have no means to excrete excess iron, with the exception of menstruation which, for the average woman, results in a loss of 3.2 mg of iron. Excess iron accumulates in tissues and organs, disrupting their normal function. The most susceptible organs include the liver, heart, pancreas, skin, joints, gonads, thyroid and pituitary gland; patients can present with cirrhosis, polyarthropathy, hypogonadism, heart failure, or diabetes.https://www.cdc.gov/genomics/disease/hemochromatosis.htm. Centers for Disease Control and Prevention There are 5 types of hereditary hemochromatosis: type 1, 2 (2A, 2B), 3, 4 and 5, all caused by mutated genes. Hereditary hemochromatosis is the most frequent, and unique related to the HFE gene. It is most ...
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Highness
Highness (abbreviation HH, oral address Your Highness) is a formal style used to address (in second person) or refer to (in third person) certain members of a reigning or formerly reigning dynasty. It is typically used with a possessive adjective: "His Highness", "Her Highness" (HH), "Their Highnesses", etc. Although often combined with other adjectives of honour indicating rank, such as "Imperial", "Royal" or "Serene", it may be used alone. ''Highness'' is, both literally and figuratively, the quality of being lofty or above. It is used as a term to evoke dignity or honour, and to acknowledge the exalted rank of the person so described. History in Europe Abstract styles arose in profusion in the Roman Empire, especially in the Byzantine. Styles were attached to various offices at court or in the state. In the early Middle Ages such styles, couched in the second or third person, were uncertain and much more arbitrary, and were more subject to the fancies of secretaries th ...
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Hodgkin–Huxley Model
The Hodgkin–Huxley model, or conductance-based model, is a mathematical model that describes how action potentials in neurons are initiated and propagated. It is a set of nonlinear differential equations that approximates the electrical characteristics of excitable cells such as neurons and muscle cells. It is a continuous-time dynamical system. Alan Hodgkin and Andrew Huxley described the model in 1952 to explain the ionic mechanisms underlying the initiation and propagation of action potentials in the squid giant axon. They received the 1963 Nobel Prize in Physiology or Medicine for this work. Basic components The typical Hodgkin–Huxley model treats each component of an excitable cell as an electrical element (as shown in the figure). The lipid bilayer is represented as a capacitance (Cm). Voltage-gated ion channels are represented by electrical conductances (''g''''n'', where ''n'' is the specific ion channel) that depend on both voltage and time. Leak channels ar ...
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Hamburg
(male), (female) en, Hamburger(s), Hamburgian(s) , timezone1 = Central (CET) , utc_offset1 = +1 , timezone1_DST = Central (CEST) , utc_offset1_DST = +2 , postal_code_type = Postal code(s) , postal_code = 20001–21149, 22001–22769 , area_code_type = Area code(s) , area_code = 040 , registration_plate = , blank_name_sec1 = GRP (nominal) , blank_info_sec1 = €123 billion (2019) , blank1_name_sec1 = GRP per capita , blank1_info_sec1 = €67,000 (2019) , blank1_name_sec2 = HDI (2018) , blank1_info_sec2 = 0.976 · 1st of 16 , iso_code = DE-HH , blank_name_sec2 = NUTS Region , blank_info_sec2 = DE6 , website = , footnotes ...
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HH (Court Street Shuttle)
HH was the last of the letters assigned to original routes of the Independent Subway System of the New York City Subway in the 1930s. It was designated as the dedicated service letter of the IND Fulton Street Line in Brooklyn. The letter was intended to be used for a service running local from Court Street, a stub-end station in Downtown Brooklyn, to the future Euclid Avenue station near the border with Queens. Express service on the four-track line was to be provided by trains coming from Jay Street–Borough Hall and Manhattan. History When service on the Fulton Street Line began on April 9, 1936, all trains serving it ran into Manhattan and the HH ran only as a two-stop shuttle to connect Court Street with Hoyt–Schermerhorn Streets. The HH ran on weekdays and Saturday from 7 a.m. to 7 p.m. At that latter station, it stopped at the outermost tracks and platforms and connections to the Fulton Street and Crosstown trains were available. Since the two stations ...
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HH (Rockaway Shuttle)
The Rockaway Park Shuttle is a New York City Subway shuttle train that operates in Queens. It connects with the train at Broad Channel station and is the latest iteration of the Rockaway Shuttle services that have been running on the Rockaway peninsula since 1956. This shuttle train provides service to the western part of the peninsula, with a terminus at Rockaway Park–Beach 116th Street. The fully above-ground route operates on trackage that was originally part of the Long Island Rail Road's Far Rockaway Branch until the mid-1950s. During summer weekends, to eliminate an additional transfer and thus ease beach access, the Rockaway Park Shuttle is typically extended four stations north to Rockaway Boulevard, the southernmost station shared by Rockaway-bound and Lefferts Boulevard-bound A trains. Like the other two shuttles, 42nd Street in Manhattan and Franklin Avenue in Brooklyn, it is marked with the letter "S" and its route bullet is colored on route signs, station s ...
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