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Keybot 73 Ergebnisse  www.visionlearning.com
  Teoría Atómica II | Che...  
Los átomos pueden ganar o perder electrones para convertirse en iones cargados.
Atoms can gain or lose electrons to become electrically charged ions.
  Fotosíntesis | Biology ...  
Una enzima llamada citocromo b6f, la próxima parada en la cadena después del fotosistema II, genera mas iones para la bomba de protones y envía los electrones excitados hacia el fotosistema I. Mientras que los iones de hidrogeno acumulan dentro del espacio de tilacoide en donde crean H+ gradiente que forja la síntesis de ATP.
At the same time, two water molecules bind to a water-splitting enzyme at the reaction center of photosystem II, as seen in Figure 6. When the water molecules split, ionized hydrogen atoms (H+) enter the thylakoid space. An enzyme called cytochrome b6f, the next stop in the chain after photosystem II, generates more ions for the proton pump and sends the excited electrons along toward photosystem I. As the hydrogen ions accumulate within the thylakoid space, they create the H+ gradient that drives ATP synthesis. ATP will be used for sugar synthesis later, in the Calvin-Benson Cycle.
  Fotosíntesis | Biology ...  
Una enzima llamada citocromo b6f, la próxima parada en la cadena después del fotosistema II, genera mas iones para la bomba de protones y envía los electrones excitados hacia el fotosistema I. Mientras que los iones de hidrogeno acumulan dentro del espacio de tilacoide en donde crean H+ gradiente que forja la síntesis de ATP.
At the same time, two water molecules bind to a water-splitting enzyme at the reaction center of photosystem II, as seen in Figure 6. When the water molecules split, ionized hydrogen atoms (H+) enter the thylakoid space. An enzyme called cytochrome b6f, the next stop in the chain after photosystem II, generates more ions for the proton pump and sends the excited electrons along toward photosystem I. As the hydrogen ions accumulate within the thylakoid space, they create the H+ gradient that drives ATP synthesis. ATP will be used for sugar synthesis later, in the Calvin-Benson Cycle.
  Agua | Chemistry | Visi...  
Cuando se añande sal de mesa al agua, las cargas parciales en la molécula de agua se sienten atraídas al Na+ y a los iones Cl-. Las moléculas de agua se encaminan hacia la estructura de cristal y entre los iones individuales, rodeándolos y disolviendo lentamente la sal.
When table salt is added to water, the partial charges on the water molecule are attracted to the Na+ and Cl- ions.  The water molecules work their way into the crystal structure and between the individual ions, surrounding them and slowly dissolving the salt.  The water molecules will actually line up differently depending on which ions are being pulled into solution.  The negative oxygen ends of water molecules will surround the positive sodium ions; the positive hydrogen ends will surround the negative chlorine ions, as shown in Figure 4.
  Agua | Chemistry | Visi...  
Cuando se añande sal de mesa al agua, las cargas parciales en la molécula de agua se sienten atraídas al Na+ y a los iones Cl-. Las moléculas de agua se encaminan hacia la estructura de cristal y entre los iones individuales, rodeándolos y disolviendo lentamente la sal.
When table salt is added to water, the partial charges on the water molecule are attracted to the Na+ and Cl- ions.  The water molecules work their way into the crystal structure and between the individual ions, surrounding them and slowly dissolving the salt.  The water molecules will actually line up differently depending on which ions are being pulled into solution.  The negative oxygen ends of water molecules will surround the positive sodium ions; the positive hydrogen ends will surround the negative chlorine ions, as shown in Figure 4.
  Agua | Chemistry | Visi...  
Cuando se añande sal de mesa al agua, las cargas parciales en la molécula de agua se sienten atraídas al Na+ y a los iones Cl-. Las moléculas de agua se encaminan hacia la estructura de cristal y entre los iones individuales, rodeándolos y disolviendo lentamente la sal.
When table salt is added to water, the partial charges on the water molecule are attracted to the Na+ and Cl- ions.  The water molecules work their way into the crystal structure and between the individual ions, surrounding them and slowly dissolving the salt.  The water molecules will actually line up differently depending on which ions are being pulled into solution.  The negative oxygen ends of water molecules will surround the positive sodium ions; the positive hydrogen ends will surround the negative chlorine ions, as shown in Figure 4.
  Agua | Chemistry | Visi...  
Cuando se añande sal de mesa al agua, las cargas parciales en la molécula de agua se sienten atraídas al Na+ y a los iones Cl-. Las moléculas de agua se encaminan hacia la estructura de cristal y entre los iones individuales, rodeándolos y disolviendo lentamente la sal.
When table salt is added to water, the partial charges on the water molecule are attracted to the Na+ and Cl- ions.  The water molecules work their way into the crystal structure and between the individual ions, surrounding them and slowly dissolving the salt.  The water molecules will actually line up differently depending on which ions are being pulled into solution.  The negative oxygen ends of water molecules will surround the positive sodium ions; the positive hydrogen ends will surround the negative chlorine ions, as shown in Figure 4.
  Membranas II | Biology ...  
Debido a que la concentración de sodio es mas alta afuera de la célula que de adentro de la célula, si las puertas del canal de sodio de repente se abren, los iones de sodio comenzarían a fluir hacia adentro.
Membrane pumps are proteins embedded in the plasma membrane that pump specific molecules or ions into or out of the cell. For example, there are proton (H+) pumps in the lining of the stomach. They pump protons into the stomach cavity, creating a very acidic solution to help digest food (Figure 5). People who suffer from chronic heartburn or indigestion might take Nexium, Prilosec, or Prevacid to treat this discomfort. These drugs work by slowing down the proton pumps in the stomach walls and thus making the stomach less acidic (Peghini et al., 1998). Other examples of pumps are the calcium (Ca2+) pumps in the intestines that help absorb calcium from food, and the glucose pumps in the kidney that grab all the glucose out of the pre-urine fluid so that we don’t lose glucose constantly in our urine. Unlike channels, all of these pumps must use energy to do this pumping.
  Química | Visionlearning  
Desde que los ácidos y bases se etiquetaron y describieron en el siglo XVII, la definición ha sido refinada a través de los siglos para reflejar el incremento en entendimiento de sus propiedades químicas, incluyendo reacciones de naturalización.
Since acids and bases were first labeled and described in the 17th century, their definition has been refined over the centuries to reflect an increased understanding of their chemical properties. This module introduces the fundamentals of acid/base chemistry, including neutralization reactions. The relationship between hydrogen ion concentration [H+] and pH is shown alongside everyday examples of acids and bases.
  Agua | Chemistry | Visi...  
El agua disuelve muchas substancias al rodear partículas cargadas 'empujadas' hacia la solución. Por ejemplo, la sal común de mesa, el cloruro de sodio, es una substancia iónica que contiene iones alternos de sodio y cloro.
The partial charge that develops across the water molecule helps make it an excellent solvent. Water dissolves many substances by surrounding charged particles and "pulling" them into solution. For example, common table salt, sodium chloride, is an ionic substance that contains alternating sodium and chlorine ions (see Figure 3).
  Membranas II | Biology ...  
Es mucho mas grande que el agua con muchos enlaces polares por toda la molécula. Iones como el sodio (Na+) y el cloruro (Cl-), tienen un tiempo aun mas difícil pasar por la membrana que la glucosa. No son solamente parcialmente cargados: son
There are transporters embedded in every cell membrane that allow molecules to pass through. In Membranes I, we discussed the water transporter, aquaporin – but there are many more of these transporters within the membranes of all living cells.
  Membranas I | Biology |...  
. La hipótesis en ese entonces era que debió haber algún tipo de poro o canal en las membranas por el cual podía pasar el agua, pero toda la evidencia de esto era indirecta. Los canales de iones ya habían sido descubiertos, pero la manera en que las células mueven agua adentro y afuera aun era un misterio.
The discovery of aquaporins highlights how proteins embedded in the plasma membrane can act as gatekeepers and govern the entry of molecules into and out of the cell. The membrane has many such gatekeepers and, like aquaporin, that are very specific. For example, aquaporin allows water molecules in and out freely, but other molecules much less so. Closely related molecules
  pop  
[] Un símbolo representando una medida de la concentración efectiva de iones de hidrógeno en una solución, pH = -log [H+]. El pH es una medida de la acidez (o la base) de una solución, donde los valores del 0 al 14 son posibles.
[] A symbol representing a measure of the effective concentration of hydrogen ions in a solution, pH = -log [H+]. pH is a measure of the acidity (or basicity) of a solution, where values of 0 to 14 are possible. Acid solutions have a pH
  Fotosíntesis | Biology ...  
Figura 7: Las proteínas de fotosíntesis incrustadas en la membrana de tilacoide llevan electrones de alta energía al Ciclo Calvin y envían iones de hidrogeno al lumen a generar un gradiente de protón.
Figure 7: Photosynthesis proteins embedded in a thylakoid membrane deliver high energy electrons to the Calvin Cycle and send hydrogen ions into the lumen to generate a proton gradient.
  Agua | Chemistry | Visi...  
Figura 3: El cloruro de sodio contiene Na+ y Cl- iones.
Figure 3: Sodium chloride contains Na+ and Cl- ions.
  Visionlearning | Su vis...  
La Tabla Periódica Ilustrada presenta una representación conceptual de la estructura modelo planetaria de los primeros once elementos en la tabla periódica y sus iones principales.
The Illustrated Periodic Table presents a conceptual representation of the planetary model structure of the first eleven elements on the periodic table and their major ions.
  Ruth Benerito | Inside ...  
Avances en el planchado permanente involucraron muchos científicos de algodón en diferentes grupos en el SRRC. Uno de estos era el químico Ralph Berni, quien trabajó junto con Benerito por muchos años en el grupo de Reacciones Químicas de Algodón.
Advances in permanent press involved many cotton scientists in different groups at SRRC. One of these was chemist Ralph Berni, who worked alongside Benerito for many years in the Cotton Chemical Reactions group. Their work resulted in numerous publications and patents in the areas of permanent press, flame retardancy, epoxide resins, and ion exchange cottons. The group’s focus was on chemically modifying cotton so it could compete with synthetic fabrics. Berni says, "Ruth’s contributions in this area focused on the understanding of the cross-linking process and its overall importance to the cotton industry."
  Agua | Chemistry | Visi...  
Cuando se añande sal de mesa al agua, las cargas parciales en la molécula de agua se sienten atraídas al Na+ y a los iones Cl-. Las moléculas de agua se encaminan hacia la estructura de cristal y entre los iones individuales, rodeándolos y disolviendo lentamente la sal.
When table salt is added to water, the partial charges on the water molecule are attracted to the Na+ and Cl- ions.  The water molecules work their way into the crystal structure and between the individual ions, surrounding them and slowly dissolving the salt.  The water molecules will actually line up differently depending on which ions are being pulled into solution.  The negative oxygen ends of water molecules will surround the positive sodium ions; the positive hydrogen ends will surround the negative chlorine ions, as shown in Figure 4.
  Glosario | Visionlearning  
La ruptura de una molécula, especialmente cuando hay calor o un solvente polar. Por ejemplo, el compuesto iónico cloruro de sodio se disocia en el agua al separar los iones de sodio cargados positivamente de los átomos clóricos cargados negativamente.
(1842), which introduced the principles behind the Doppler Effect and attempted to explain the apparent shift in wavelength of light emitted by a moving star.