作者: humectant 時間: 2025-3-23 05:57
alen Durchgang sto?en wir auf eine uralte befestigte Bergsiedlung: Tschufut-Kale. Lange bevor die Tataren die Krim eroberten, war sie bereits gegründet. Schmale G??chen zwischen Steinhaufen, die einst Wohnst?tten waren, die angenehme Kühle der Felsenkeller, die Sonnenhitze der Steinwüste... Nur Rads
作者: 序曲 時間: 2025-3-23 12:39
Royce E. JohnsonFamilie von Dietrich bettet, die jenseitige Talwand empordtiegen und nun durch Buchenwaldungen südlich weiter strebten, geschah es wieder im Vorgefühl gro?er Erwartungen. Hatte gestern der Zauber altgermanischen Heldengeistes um sie gespielt, heute wollten sie über St?tten schreiten, getr?nkt von de
作者: orthodox 時間: 2025-3-23 15:12
作者: 相反放置 時間: 2025-3-23 18:57
R. V. Hoffman?ndlich angenommenen Einzigartigkeit und Dreidimensionalit?t des Raumes befreite, was die Motive hierfür waren und welche Ergebnisse erzielt wurden. Unter diesen ragt ein Topos heraus: die Bestimmung der regul?ren Polytope im vierdimensionalen Raum. Nicht nur innermathematisch erregte die neue Geome
作者: abolish 時間: 2025-3-23 23:03
作者: 分開如此和諧 時間: 2025-3-24 03:23
作者: hermetic 時間: 2025-3-24 06:49
Arthur Karmenezifische Gene gesteuert. Die kausale Beziehung zwischen einer rezessiven Genmutation und der malignen Entartung wurde erstmals bei der Fruchtfliege . an einer Reihe von Genen nachgewiesen [21, 22, 36]. Diese mutierten, also funktionslosen Entwicklungsgene zeigen einen rezessiv-letalen Vererbungsmod
作者: 財主 時間: 2025-3-24 10:41
作者: overweight 時間: 2025-3-24 16:24
作者: 男生如果明白 時間: 2025-3-24 22:37
作者: 關(guān)節(jié)炎 時間: 2025-3-25 02:46
Recent Advances in Applications of the Microcoulometric Titrating System,or this unique analytical system. The instrumentation was used originally as a gas chromatographic detector and applied to the area of pesticide residue analysis because of the system’s specific response to chlorinated and sulfur-containing organic compounds. In recent years, however, use of this ve
作者: eardrum 時間: 2025-3-25 03:52
Automatic Integrators and Gas Chromatography,ed, eliminating steps, or automating routine functions. Because of the number and complexity of samples analyzed in many gas-chromatography laboratories, simplification of the analysis is worthwhile. Automatic integration of peak areas can be one way to achieve this simplification.
作者: insidious 時間: 2025-3-25 08:48
Measurement of Trace Amounts of Inert Gases in Blood by Gas Chromatography,hods for quantitating trace amounts of the gases in blood, until recently, have made it feasible to employ only those agents having commercially available radioisotopes (e.g., Kr. and Xe.). Of particular interest are gases that possess extremely low solubilities in blood, because these gases tend to
作者: Torrid 時間: 2025-3-25 13:01
Gas Chromatography of Vitamin B6 and Other Vitamins,f separation, sensitivity, and convenience in quantitation. The recently introduced combination of gas chromatography with mass spectrometry [.] can be expected to provide a powerful tool for analytical studies in this field, such as those concerned with the metabolic fates of vitamins and their ana
作者: 騷動 時間: 2025-3-25 16:08
Dual Channel Gas Chromatography,two detectors for examining the column effluent. It was first used by Dr. James Lovelock, who has shown simultaneous chromatograms of chlorinated substances obtained with an electron capture detector and an argon detector I.]. In addition to showing two chromatograms, dual channel gas chromatography
作者: 周興旺 時間: 2025-3-25 21:39
Analytical Methods for Pesticides,interfering substances that must be removed. Tolerances for all compounds used on edible crops are set by the Food and Drug Administration. For, compounds that possess low toxicity, tolerances are relatively high. Thus, residues of 7 ppm of DDT are permissible. However, crops containing a few hundre
作者: 受傷 時間: 2025-3-26 03:57
A Modified Hydrogen Flame-Ionization Detector, Highly Sensitive and Selective for Phosphates,ms one is capable of detecting halogens, sulfur, and phosphorus with high specificity but with somewhat low sensitivity, while with the electron capture detector one can detect compounds containing strong electronegative groups with high sensitivity but with low specificity. While in most cases the
作者: 不能仁慈 時間: 2025-3-26 04:50
作者: Aids209 時間: 2025-3-26 11:49
Analysis of Some Nonprotein Amino Acids by Gas Chromatography,t since Bayer’s first demonstration in 1957 [.] that various suitable volatile derivatives could be made and separated. Most of the attention has, naturally, been directed toward the analysis of the amino acids which commonly occur in proteins, since the ion-exchange methods presently available set
作者: Uncultured 時間: 2025-3-26 15:00
作者: 嘲笑 時間: 2025-3-26 17:22
Gas Chromatography of Amino Acids,Amino acid gas chromatography procedures were reviewed in 1962 by Burchfield and Storrs [.] and by Littlewood [.]. Since that time additional procedures have been developed, and several workers have used these procedures to analyze the amino acid composition of proteins, blood, and nerve tissue and to resolve optical isomers.
作者: 全神貫注于 時間: 2025-3-27 00:44
作者: 預(yù)示 時間: 2025-3-27 01:11
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作者: PALMY 時間: 2025-3-27 06:40
Characteristics of the Phosphate Sensitive Sodium Sulfate Modified Hydrogen Flame Ionization Detect attachment detector, for example, has aided chemical manufacturers in developing many effective, safe-to-use pesticides. Regulatory agencies have found the electron attachment detector indispensable for their pesticide residue examinations.
作者: GROG 時間: 2025-3-27 13:02
Analysis of Organophosphorus and Organic Iodine Pesticide Residues by Microwave Powered Emission Spr [.] and the sodium thermionic detector [.] are well known and are being routinely used for residue analysis. More recently the flame emission [.], the stacked flame detector [.], and the phosphine reduction detector [.] have become commercially available for these compounds.
作者: Endearing 時間: 2025-3-27 14:10
作者: adduction 時間: 2025-3-27 21:34
作者: 辮子帶來幫助 時間: 2025-3-27 22:06
作者: paleolithic 時間: 2025-3-28 03:18
Recent Advances in Applications of the Microcoulometric Titrating System,ds in addition to sulfur and halogen analysis. Continuing investigation indicates the possibility for specific carbon and phosphorus detection as well as selective response to certain classes of organic compounds.
作者: PACK 時間: 2025-3-28 08:26
Analytical Methods for Pesticides,inst concentration gradients. In general, it is necessary to be able to analyze for pesticides at the 0.01 to 10 ppm level in foods and animal tissues and at the ppt or ppblevels and upward in environmental pollution studies.
作者: ALERT 時間: 2025-3-28 14:25
作者: Alveoli 時間: 2025-3-28 18:12
Dual Channel Gas Chromatography,tances obtained with an electron capture detector and an argon detector I.]. In addition to showing two chromatograms, dual channel gas chromatography offers more than twice the qualitative and quantitative information than is available in a single channel system.
作者: Incumbent 時間: 2025-3-28 21:38
作者: misshapen 時間: 2025-3-28 22:57
作者: 態(tài)度暖昧 時間: 2025-3-29 06:39
Galvanic-Coulometric Detectors in Gas Chromatography,dation of one molecule means stripping it of 14 × 4 + 10 × 1 = 66 electrons. Thus, a stream of fewer than 100 molecules per sec of this compound is detectable in principle. In the case of compounds with more carbon and hydrogen atoms in the molecule, the sensitivity in these terms is higher still, compensating for their lesser volatility.
作者: Interdict 時間: 2025-3-29 10:26
Analysis of Some Nonprotein Amino Acids by Gas Chromatography,imited, and maintaining the apparatus takes up scarce technical manpower. Gas chromatography holds out great promise in overcoming these drawbacks, but the accuracy. of the quantitation achieved by ion-exchange chromatography sets a high standard against which to measure gas chromatographic methods, and this has been approached only recently [.].
作者: 偽造 時間: 2025-3-29 12:18
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