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  • determination
  • M ¯ n = ∑ i N i M i ∑ i N i {\displaystyle {\bar {M}}_{n}={\frac {\sum _{i}N_{i}M_{i}}{\sum _{i}N_{i}}}} The number average molecular mass of a polymer can be determined by gel permeation chromatography, viscometry via the (Mark-Houwink equation), colligative methods such as vapor pressure osmometry, end-group determination or proton NMR. (wikipedia.org)
  • Factor
  • It is chosen so that the retention factor value of the compound of interest is roughly around 0.2 - 0.3 in order to minimize the time and the amount of eluent to run the chromatography. (wikipedia.org)
  • Fraction
  • By dissolving a polymer an insoluble high molar mass fraction may be filtered off resulting in a large reduction in Mm and a small reduction in Mn thus reducing dispersity. (wikipedia.org)
  • techniques
  • SWV analysis has been used recently in the development of a voltammetric catechol sensor, in the analysis of a large number of pharmaceuticals, and in the development and construction of a 2,4,6-TNT and 2,4-DNT sensor In addition to being utilized in independent analyses, SWV has also been coupled with other analytical techniques, including but not limited to thin-layer chromatography (TLC) and high-pressure liquid chromatography. (wikipedia.org)
  • These techniques involve forcing a polymer solution through a matrix of cross-linked polymer particles at a pressure of up to several hundred bar. (wikipedia.org)
  • acid
  • Molecular sieving using Sephadex G-25 with acetic acid revealed a distinct peak in the 1000 MW range and a smaller, higher molecular weight peak which needs further investigation. (ahajournals.org)
  • Determine the amino acid by chromatography and comparison with standards. (wikipedia.org)
  • concentrations
  • Spontaneously hypertensive rats did not have higher concentrations of hypothalamic angiotensin II than normotensive rats. (ahajournals.org)
  • It has been shown that ethyl carbamate forms from the reaction of ethanol with urea: This reaction occurs much faster at higher temperatures, and therefore higher concentrations of ethyl carbamate are found in beverages that are heated during processing, such as brandy, whiskey, and other distilled beverages. (wikipedia.org)
  • similar
  • In quiescent cells, on average, PtdIns5P is of similar or higher abundance as compared to PtdIns3P and ~20-100-fold below the levels of PtdIns4P (Phosphatidylinositol 4-phosphate and PtdIns(4,5)P2 (Phosphatidylinositol 4,5-bisphosphate). (wikipedia.org)
  • levels
  • The highest levels were found in the hypothalamus (125 pg/g tissue), pituitary (190 pg/g tissue), spinal cord (199 pg/g tissue), and lower levels were found in cortex (60 pg/g tissue). (ahajournals.org)
  • Another important mechanism for ethyl carbamate formation in alcoholic beverages is the reaction from cyanide as precursor, which causes comparably high levels in spirits derived from cyanogenic plants (i.e. predominantly stone-fruit spirits and cachaça). (wikipedia.org)
  • Notably, steady-state PtdIns5P levels are more than 5-fold higher than those of PtdIns(3,5)P2. (wikipedia.org)
  • advantage
  • The high degree of interconnectivity in monoliths confers an advantage seen in the low backpressures and readily achievable high flow rates. (wikipedia.org)
  • separate
  • Because of the minimal contributions from non-faradaic currents, the use of a differential current plot instead of separate forward and reverse current plots, and significant time evolution between potential reversal and current sampling, high sensitivity screening can be obtained utilizing SWV. (wikipedia.org)
  • Medicine
  • High doses of anticonvulsant medicine are often required to halt seizure activity and further medical care including intubation and mechanical ventilation may be required. (wikipedia.org)
  • affinity
  • Radioligands are used to measure the ligand binding to receptors and should ideally have high affinity, low non-specific binding, high specific activity to detect low receptor densities, and receptor specificity. (wikipedia.org)
  • solvents
  • Proper filtration of samples, solvents and buffers not only generates higher quality, more consistent results, but it also increases instrument uptime and prolongs chromatographic column life. (scribd.com)
  • sensitivity
  • The sensitivity of LSII, for protein detection, is higher by an order of magnitude compared to ESI. (wikipedia.org)
  • This feature combined with its ease of use, relatively high sensitivity, and highly compact design have allowed IMS as a commercial product to be used as a routine tool for the field detection of explosives, drugs, and chemical weapons. (wikipedia.org)
  • Because of the minimal contributions from non-faradaic currents, the use of a differential current plot instead of separate forward and reverse current plots, and significant time evolution between potential reversal and current sampling, high sensitivity screening can be obtained utilizing SWV. (wikipedia.org)
  • doses
  • However, combinations of high doses of benzodiazepines with alcohol, barbiturates, opioids or tricyclic antidepressants are particularly dangerous, and may lead to severe complications such as coma or death. (wikipedia.org)
  • High blood lactic acid level is a concern if the medication is prescribed inappropriately and in overly large doses. (wikipedia.org)
  • High doses have been observed to cause intense, prolonged panic attacks in stimulant-intolerant users, and there are anecdotal reports of psychosis from sleep withdrawal and addiction at higher doses or more frequent dosing intervals. (wikipedia.org)
  • analyte
  • Measurements in the negative ion mode are especially favorable when the analyte molecules exhibit a high gas-phase acidity, as it is the case e.g. for carboxylic acids. (wikipedia.org)
  • temperature
  • In gas-liquid chromatography (now called gas chromatography), the material that separates components is chemically bonded to the solid support, which improves the temperature stability of the column's packing. (encyclopedia.com)
  • The temperature can vary in the inlet tube from 50 °C to 450 °C, with the lower temperature being used if the results obtained from a higher temperature are of good resolution. (wikipedia.org)
  • It can be broken down chemically into its glucose units by treating it with concentrated mineral acids at high temperature. (wikipedia.org)
  • Whereas starch undergoes a crystalline to amorphous transition when heated beyond 60-70 °C in water (as in cooking), cellulose requires a temperature of 320 °C and pressure of 25 MPa to become amorphous in water. (wikipedia.org)
  • The physical quantity ion mobility K is defined as the proportionality factor between an ion's drift velocity vd in a gas and an electric field of strength E. v d = K E {\displaystyle v_{d}=KE} Ion mobilities are commonly reported as reduced mobilities, correcting to standard gas density n0, which can be expressed in standard temperature T0 = 273 K and standard pressure p0 = 1013 hPa. (wikipedia.org)
  • Order
  • The newly acquired understanding has enabled researchers to exert a high degree of control over particle size and distribution and to fine-tune the physical properties of the resulting material in order to suit intended applications. (wikipedia.org)
  • Ions
  • exhibit very high gas-phase acidities, even compounds with a rather low gas-phase basicity are readily ionized by proton transfer, yielding [M+H]+ quasimolecular ions. (wikipedia.org)
  • inlet
  • The inlet flow is where the carrier liquid is pumped into the channel and it creates a parabolic flow profile and it propels the sample towards the outlet of the channel. (wikipedia.org)
  • sample
  • IMS instruments such as microscale high-field asymmetric waveform ion mobility spectrometry can be palm-portable for use in a range of applications including volatile organic compound (VOC) monitoring, biological sample analysis, medical diagnosis and food quality monitoring. (wikipedia.org)
  • material
  • Typically, a stream of liquid or gas (the mobile phase) flows constantly through a tube (the column) packed with a porous solid material (the stationary phase). (encyclopedia.com)
  • Events
  • For example, a 2014 review found tentative evidence that people treated with sulfonylureas had a higher risk of severe low blood sugar events (RR 5.64), though their risk of non-fatal cardiovascular events was lower than the risk of those treated with metformin (RR 0.67). (wikipedia.org)
  • five
  • There are five chemotaxonomic types of Cannabis: one with high levels of THC, one which is more fibrous and has higher levels of CBD, one that is an intermediate between the two, another one with high levels of cannabigerol (CBG), and the last one almost without cannabinoids. (wikipedia.org)
  • components
  • The low-boiling components tend to evaporate more rapidly, hence they may be removed from the bulk solution containing higher-boiling components. (wikipedia.org)
  • solid
  • Through the development of RIA technology, researchers have been able to move beyond the use of radioactivity, and instead, use liquid- and solid-phase, competitive, and immunoradiometric assays. (wikipedia.org)
  • water
  • Plant-derived cellulose is usually found in a mixture with hemicellulose, lignin, pectin and other substances, while bacterial cellulose is quite pure, has a much higher water content and higher tensile strength due to higher chain lengths. (wikipedia.org)
  • flow
  • l = k T F {\displaystyle l={\frac {kT}{F}}} Where k is the Boltzmann constant, T is absolute pressure and F is the force exerted on a single particle by the cross flow. (wikipedia.org)
  • control
  • To ensure that the production process is under our control, we have built factory of our own, what's more, we have bought the most shares of several high-quality manufacturers. (buyextracts.com)
  • Although there is no experience about the long-term effects of MDPV in humans, its has been reported that mice treated with MDPV during adolescence show reinforcing behavior patterns to cocaine which are higher than the control group. (wikipedia.org)
  • Single
  • Since the maximum speed difference of the two motors is twice as high as the speed of a single EC motor, the maximum speed difference is doubled - up to 6000 rpm. (selectscience.net)
  • either
  • α-Pinene Myrcene Linalool Limonene Trans-β-ocimene α-Terpinolene Trans-caryophyllene α-Humulene, contributes to the characteristic aroma of Cannabis sativa Caryophyllene, with which some hashish detection dogs are trained Human intervention has produced variation within the species and some authorities only recognize one species in the genus that has had divergent selective pressure to either produce plants with more fiber or plants with greater THC content. (wikipedia.org)
  • plants
  • Cellulose produced by bacteria and algae is enriched in Iα while cellulose of higher plants consists mainly of Iβ. (wikipedia.org)
  • Besides THC, another cannabinoid produced in high concentrations by some plants is cannabidiol (CBD), which is not psychoactive but has recently been shown to block the effect of THC in the nervous system. (wikipedia.org)
  • however
  • Thigh: Common femoral or aortoiliac surgery colorectal and ovarian cancer screening by primary validation of post operative nausea antiemetic agent decrease and re treatment criteri recommendation only offer cryotherapy and high - dose amoxicillin or amoxicillin - clavulanate, mg po with qd and with your gloved thumb and nger exor mus - may - fluorouracil [], however, no evidence that women taking hrt when compared with vertebroplasty. (bvbdallas.org)
  • vary
  • Rates of lactose intolerance vary between regions, from less than 10% in Northern Europe to as high as 95% in parts of Asia and Africa. (wikipedia.org)