BIRD experiment

The intensity of microwaves at ground level in the center of the beam is likely to be comparable to that used by mobile phones. The microwaves cannot be too intense in order to avoid injury to wildlife, especially birds. Experiments with microwaves at reasonable levels have failed to show any negative effects even over multiple generations. Some designs locate rectennas offshore, but this presents other problems. 

That coarse grain should be included in the diet of all laying birds Experience has shown that the adoption of the recommended comfort and feeding practices encourages stock to develop a natural ability to surmount disease Where, however, disease occurs, herbal treatments should be used in the first instance Permitted That calves and young pigs remain housed, provided they have fresh air,... 

A very efficient suppression of parent resonances can be achieved using the T filter. This, however, requires a rather careful tuning of the relaxation delay T (see Figure 8). If the jump and return inversion pulse is employed, the pulse sequence can be regarded as a selective version of the BIRD experiment [57-59]. Obviously, multiple-frequency selective inversion pulses may be necessary in the case of complex proton spectra. Usually the /-BIRD HMQC experiment gives cleaner spectra as compared with equivalent heteronuclear singlequantum coherence (HSQC) experiments, presumably because of fewer 180° pulses which are frequently a source of various artefacts. 

MEASUREMENT OF DISSOCIATION KINETICS VIA BIRD EXPERIMENTS. In trapping instruments, fragmentation reactions can be studied as a function of both time as well as temperature of the cell. An Arrhenius analysis of the resultant unimolecular rate constants as a function of temperature allows activation energies to be determined for each fragmentation process [18]. 

The problem that the pre-exponential factor cannot be determined from quantitative IRMPD experiments can be circumvented by using an experiment which is called blackbody infrared radiative dissociation (BIRD). As in IRMPD experiments, BIRD is usually conducted in FTICR instruments. It does, however, require some special equipment, which is not always available. The BIRD experiment again is based on IR photon exchange with the ions in order to restore thermal equilib-... 

The young of these migratory fish-eating birds experience neurological and histological damage associated with exposure to dietary mercury. 

B. G. N. A. Crawford, P. Hewson and P. Bird, Experiments on full-scale wave impact pressures. Coastal Eng. 8, 331-346 (1999). 

The SELINCOR experiment is a selective ID inverse heteronuclear shift-correlation experiment i.e., ID H,C-COSYinverse experiment) (Berger, 1989). The last C pulse of the HMQC experiment is in this case substituted by a selective 90° Gaussian pulse. Thus the soft pulse is used for coherence transfer and not for excitation at the beginning of the sequence, as is usual for other pulse sequences. The BIRD pulse and the A-i delay are optimized to suppress protons bound to nuclei As is adjusted to correspond to the direct H,C couplings. The soft pulse at the end of the pulse sequence (Fig. 7.8) serves to transfer the heteronuclear double-quantum coherence into the antiphase magnetization of the protons attached to the selectively excited C nuclei. 

Leonzio C, Massi A. 1989. Metal biomonitoring in bird eggs. A critical experiment. Bull Environ Contam Toxicol 43 402 06. 

A total of 48 White Leghorn pullets approximately 6 months of age were used in the experiment. Thirty-two pullets were selected at random from the original 48 birds, and divided into four groups of 8 birds each. One group was then assigned to each mash made with the hay dusted with 0, 1, 2, and 4 pounds of technical DDT per acre. 

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