Double bands

An analogous behaviour is found for the C=0 stretching vibration in solvatated ethyl acetate. In Mn(P02Cl2)2 2 E the crystallographically determined cis-position of the solvent molecules 77), which are coordinated with their keto 0-atoms, can be realised by the double band at 1700/1688 cm ... 

The PE spectra of cyclobutadiene 281192, tetra-t-butylcyclobutadiene 282193, 1,3,5-tri-t-butylpentalene 283194 and aceheptylene 284195, all of which are subject to second-order bond localization, have been described in the literature. Further examples are 1,3,5,7-tetra-t-butyl-s-indacene 285 (which exhibits a first double band 1,2 at I 2 = 6.75 eV, followed by two bands at I = 8.50 eV and I = 9.30 eV) and the tetracyclic hydrocarbon 1,3,6,8-tetra-t-butylpentaleno[2,l-a]pentalene 286 (the first two bands of which are observed at 6.40 eV and 7.65 eV)196. 

Fig. 5. Thirty-four out of 35 potential apo(a) isoforms, separated by SDS-agarose gel electrophoresis. The photograph represents a composite of two separate gels with the reference mixture (St) and 17 different samples applied to each gel. Samples were selected to represent each of the observed isoforms. Twenty-nine samples had single-handed patterns and five samples had double-banded patterns. The double banded types and every fifth single-handed phenotype are indicated at the bottom of each gel lane. [With permission of Marcovina et al. (M12).]...

Fig. 4. Bottom the Double-Band-Filtered COSY spectrum obtained by selection through DANTE-Z of the H region (prior to the evolution interval) and by the selection through SPlN-PlNGING [11] of the amide region (before the acquisition interval) of toxin 7. Top the corresponding region of a standard COSY spectrum. Note, in the bottom diagram, the considerable increase in spectral resolution as well as the occurrence of additional crosspeaks (indicated with asterisks). Experiments were performed at 360 MHz (Bruker AMX360) in H2O at 318 K. The 50 W class C amplifier of the proton channel was used as transmitter.

The simplest grommet consists of a piece of rope, looped at each end and wrapped once directly over the rotating band or in front of it, or in case of double-banded shell, between the bands. After this the hemp twine is drawn tightly thru the two end loops and secured by a "slipknot" (Knot designed to slide or pull free under strain)... 

Fig. 4.5.3 IEF patterns of serum transferrin. Sera from a control (lane 1), three CDG-I (CDG-Ia, CDG-Ic and CDG-Id lanes 2-4) and three CDG-II patients (CDG- , CDG-IId and CDG-IIx lanes 5-7) were analysed by IEF. In case of a control person, the main form of the protein carries four negatively charged sialic acid residues, even though small amounts of penta- and trisialo-transferrin are detectable. Additional disialo- and asialotransferrin forms indicate CDG-type I (left side). In some cases of CDG type II, additional trisialo- and monosialotransferrin forms may occur, which are due to the loss of either one or three sialic acid residues (right side). Isoforms of transferrin that are independent of a pathological phenotype and that cause double bands in IEF are visible in lanes 4 and 6. CDG-IIx indicates a transferrin pattern that is caused by a so far unknown molecular defect from the CDG-II type...

Macrolides are a group of compounds containing a macrocyclic lactone ring and up to 9 conjugated tram double bands. In recent years, new macrolides have been isolated from marine organisms, some of them reported as promising candidates for future drugs. 

Chlorins and metallochlorins exhibit two intense absorptions corresponding to the porphyrin Soret (y) and Q (a) bands, at 400nm (e w 105, B) and 660 nm [e 10s, Qy(0,0)].2 The former is usually accompanied by two shoulders (ij, and rt bands) on the blue side, and the latter by three weak bands [Qy(l,0), Qx(0,0), Qx(l,0)]. Medium intensity double bands at 500 nm (e as 104) in the metal-free chlorin spectra disappear on metallation. In the Bchl spectra, the Qy(0,0) band batho-chromically shifts to 750nm (e a 105) accompanied by a weak band ( 690nm), and the Soret band splits in two ( 360, 400 nm e 10s). Between those two main bands, a medium intensity... 

It is now necessary to deduce the nature of the carbonyl function (i.e. whether it is an aldehyde, ketone, ester, etc.). Each of these functional groups (with the exception of ketones) exhibits further characteristic and identifiable absorption bands due to the attachment of atoms other than carbon to the carbonyl carbon atom. Thus an aldehyde should exhibit a double band in the region of 2830-2700 cm-1, due to stretching of the C—H bond in the aldehydic group. A car-... 

All naturally occurring prostaglandins are derived through the cyclization of 20-carbon unsaturated fatty acids such as arachidonic acid, which in turn is synthesized from the essential fatty acid linoleic acid. The prostaglandins are named according to their ring substitutions and the number of additional side-chain double bands, as seen in prostaglandins E1( Fla, and F2a. 

Some weak features attributed to the BEDO-TTF intramolecular vibrations are observed below 1600 cm-1 and a narrow double band near 2100 cm 1 is assigned to the CN stretching vibration of the anion. Below 200 K the qualitative change in the reflectivity spectra for E L is accompanied by the appearance of new vibrational features at 862 and 1012 cm 1. 

Composition and microstructure determination of polybutadiene (BR) and natural rubber (NR) can be done by infrared spectra. Three different base units are possible for linear addition polymers of 1,3 butadiene units with cis or trans internal double bands from 1,4 addition and units with side vinyl groups from 1,2 addition (see Scheme 3.1a). 

We repeated this grafting reaction [100] by photochemical initiation and we showed that if the addition onto the 1,2 double bands was favored, the fluorinated thiols could be grafted onto all double bands of PBHT and diols with a fluorine amount of 55% could be obtained. Moreover, this study shows an improvement of the dispersion (observed in G.P.C.) when the grafting was realized by photochemical initiation in comparison to that realized by classical initiators. 

Electrode geometry — Figure 2. Array geometries, a Random array of inlaid disk electrodes b ordered array of inlaid disk electrodes c double band array d interdigitated array... 

The structure of the dimer 4 has been fully established by X-ray analysis of the bromo analogue 4b 174>. The IR-spectrum of the dimers such as 4 in CC14 shows the characteristic double bands of the CO group near 1666 cm-1 1751 and another band at 1201 cm-1 due to the phenolether. Substitution of 160 by 180 in la shifts the C = 0... 

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