Indo1 is a ratiometric and sensitive indicator dye for measuring intracellular calcium. Since its introduction in 1985, indo-1 has been cited in thousands of papers that describe its applications in a wide variety of cells. These important Ca2+ indicators, developed by Roger Tsien and collaborators, have made a major contribution to advances in the understanding of the role of calcium in cellular regulation.
The ability to make ratio measurements with indo-1, and their derivatives is an important property of these probes. At low concentrations of the indicator, use of the 405/485 nm emission ratio for indo-1 allows accurate measurements of the intracellular Ca2+ concentration. Measurement by ratio analysis considerably reduces the effects of uneven dye loading, leakage of dye, and photobleaching, as well as problems associated with measuring Ca2+ in cells of unequal thickness. Measurements of indo-1 fluorescence can usually be made over a period of an hour without significant loss of fluorescence resulting from either leakage or bleaching. In addition, indo-1 is bright enough to permit measurements at intracellular concentrations of dye unlikely to cause significant Ca2+ buffering or damping of Ca2+ transients.
In contrast to fura indicators, which exhibit large changes in absorption on Ca2+ binding, the emission of indo-1 shifts from about 475 nm without Ca2+ to about 400 nm with Ca2+ when excited at about 350 nm (Figure 1). Indo-1 is especially useful for flow cytometry where it is easier to change the emission filters with a single excitation source (often the ultraviolet lines of the argon-ion laser in flow cytometers), and is particularly suited for multicolor fluorescence applications. Measurements with indo-5F can be carried out using the same instrument configurations as for indo-1.
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Phorbol 12-myristate 13-acetate (PMA) can induce transcription of a number of "early" genes in quiescent fibroblasts, although the biochemical steps intervening between activation of protein kinase c and changes in gene-regulatory proteins are only partially known. To investigate these pathways further, we have studied the effect of indomethacin (INDO) on the induction of expression by PMA of three early genes (c-fos, egr-1 and c-myc) in quiescent BALB/c 3T3 cells. INDO was found to markedly change the kinetics of PMA-induced c-fos and egr-1 gene expression, as measured by Northern analysis. As opposed to the normal peak of mRNA at 30 min and 30-60 min for c-fos and egr-1, respectively, the appearance of each peak in the presence of INDO was delayed by 30-60 min, although the amount of mRNA was approximately normal. By contrast, c-myc mRNA levels remained low for at least 3 hr. This effect on gene expression required concentrations of INDO (0.25-1 mM) which have previously been shown to inhibit cAMP-dependent protein kinases. The effect was reversible: after 75 min treatment with INDO followed by removal of the drug, c-fos was induced with normal kinetics by PMA. Cycloheximide superinduced the expression of c-fos, egr-1 and c-myc after PMA treatment; INDO inhibited this superinduction. Although its mode of action is not yet defined, the ability of INDO to perturb the kinetics of expression 3 PMA-inducible genes may make it a useful drug to study the signal transduction pathways involved in gene induction.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit bodhati "is awake, is watchful, observes," buddhah "awakened, enlightened;" Old Church Slavonic bljudǫ "to observe;" Lithuanian budėti "to be awake;" Old Irish buide "contentment, thanks;" Old English bodian "proclaim, announce; foretell," boda "messenger."
Middle English bidel, from Old English bydel "herald, messenger from an authority, preacher," from Proto-Germanic *budilaz "herald" (source also of Dutch beul, Old High German butil, German Bttel "herald"), which is, according to Watkins, from PIE root *bheudh- "be aware, make aware."
The sense of "warrant officer, tipstaff" was in late Old English; that of "petty parish officer," which has given the job a bad reputation, is from 1590s. French bdeau (Old French bedel, 12c.), Spanish bedel, Italian bidello are Germanic loan-words.
probably an early Middle English mutual influence or confusion of two older words: The sense in bid farewell is from Old English biddan "to ask, entreat, beg, pray, beseech; order" (class V strong verb, past tense bd, past participle beden), from Proto-Germanic *bedjanan "to pray, entreat" (source also of German bitten "to ask," attested in Old High German from 8c., also Old Saxon biddian, Old Frisian bidda "ask, request command," Old Norse bija, Gothic bidjan "request"). This, according to Kluge and Watkins, is from a PIE root *gwhedh- "to ask, pray" (see bead (n.)).
The control of fire by early humans was a turning point in the technological evolution of human beings. Fire provided a source of warmth, protection from predators, a way to create more advanced hunting tools, and a method for cooking food. These cultural advances allowed human geographic dispersal, cultural innovations, and changes to diet and behavior. Additionally, creating fire allowed human activity to continue into the dark and colder hours of the evening.
The Goddess associated with eternally burning fire was Vesta. Where the majority of temples would have a statue, that of Vesta had a hearth. The fire was a religious center of Roman worship, the common hearth (focus publicus) of the whole Roman people. The Vestals were obliged to keep the sacred fire alight. If the fire went out, it must be lit from an arbor felix, auspicious tree, (probably an oak). Water was not allowed into the inner aedes nor could stay longer than strictly needed on the nearby premises. It was carried by the Vestales in vessels called futiles which had a tiny foot that made them unstable.
Fire commemoration and worship has a long history among the Indo-Iranians, perhaps going back to the Proto-Indo-European religion. The Indo-Iranians believed that fire was the essence of life and existence. The tradition remains among Muslim Iranians in later periods to ignite candles or put the light on the graves of the dead. However amongst Parsis and Iranian Zoroastrians there are consecrated Fire Temples where fire by a complex consecration rituals is installed and kept ever burning to this day.
But it is especially to fire and water that they offer sacrifice. To fire they offer sacrifice by adding dry wood without the bark and by placing fat on top of it; and then they pour oil upon it and light it below, not blowing with their breath, but fanning it; and those who blow the fire with their breath or put anything dead or filthy upon it are put to death.
En or Enji is the reconstructed name of the fire god in the Albanian pagan mythology, who is thought to have been worshipped by the Illyrians in antiquity and to have been the most prominent god of the pantheon in Roman times. The name continues to be used in the Albanian language for Thursday (e enjte). Another name of a fire god worshipped in Northern Albania until recent times is Verbt, while the name hyj meaning "burn, glow" is used uncapitalized to refer to the deities and the stars, and capitalized to refer to the Supreme Being.
In Albanian folk beliefs, Nna e Vatrs is the protector of the vatr, the domestic fireplace. It is said that the fireplace should be cleaned in the evening. If it is left uncleaned, Nna e Vatrs becomes angry. At feasts, people used to practice sacrificial offerings to the deity throwing some of the food they prepared into the fire and around the hearth. The first element nn/nan or m/am means "mother", while the last element vatr/votr means "hearth", "fireplace" and is related to the Avestan atar meaning "fire".
Watra is a large fire with a tall wooden tripod over it. A name found especially in the Carpathians, but also outside their area. The purpose of lighting the watra is to recall the memory of people who have passed away, remembering the old times, awakening a sense of community, recalling traditions, summoning neighbors, and sometimes just evoking a specific mood. People often sang, told stories or spent time in silence at the watras. On the tripod you can prepare meals, dry clothes, etc. In the past, the term referred to fires made in huts or houses.
According to Peter von Dusburg, writing in 1326, the name Romuva is derived from the word Rome. He describes the Kriwe as a powerful priest who was held in high regard by the Prussians, Lithuanians, and Balts of Livonia. His messengers were recognized by a certain rod or other insignia. He guarded the eternal sacred flame and could look into the destiny of deceased followers. He received one third of any booty taken by pagan warriors. Kriwe-Kriwajto had dozens of lower rank priests, such as wajdelotas, who assisted him in the rituals and were responsible for the burning of the holy fire under the sacred oak in Romuva.
In Slavic mythology, Svarog, meaning "bright and clear", was the spirit of fire. The best known and dramatic among numerous Slavic Pagan fire rituals is the jumping over the bonfire on the Ivan Kupala Day.
During the celebration of Samhain (1st of November), the Celtic New Year and the beginning of the long, dark half of the year, the entire village would extinguish their hearth fires and ceremonially relight them from the King's fire. This fire was ritually lit by the King's chief Druid.
The summer solstice, or Alban Heruin, was the longest day of the year. Observed on the 21st of June, it was the time when the Sun reached its zenith and cast three rays to light the world. Alban Heruin, or "The Light of the Shore," is also referred to as Litha or Midsummer's Day. It was traditionally celebrated out in the forest with picnics, games, and a large bonfire.
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