Effects on Phase Transitions in Tripalmitin due to the Presence of Dipalmitin,Sorbitan-Monopalmitate or Sorbitan-Tripalmitate

The effects of diglycerides, sorbitan-monoesters and sorbitan-triesters on triglyceride polymorphic transitions have been examined. Earlier reported effects of retardation of β' ← transitions due to the presence of asymmetric diglycerides were found to be the same from the racemic and antipode forms. The α ← β and β' ← β transitions of tripalmitin (PPP) were followed when sorbitan-monopalmitate (SMP), sorbitan-tripalmitate (STP), or dipalmitate (DP) were present. The STP gave a slightly stronger reduction in transition kinetics than DP, whereas SMP was found to promote the transition. In order to understand the mechanisms involved the binary systems SMP-PPP and STP-PPP were examined. In the case of SMP-PPP a 1:1 molecular compound is formed, whereas STP-PPP a 1:1 molecular compound is formed, whereas STP-PPP shows a simple eutectic behaviour.     

Rat strain differences in copulatory behavior after para-chlorophenylalanine and hormone treatment.

The potentiation of masculine copulatory behavior in castrated male rats following systemic parachlorophenylalanine (PCPA) treatment was found to be dependent upon the strain of rat and the recency of castration. Wistar (W) and Sprague-Dawley (SD) males displayed a decline in behavioral responsiveness to PCPA treatment following castration, the Ws retaining their behavioral responsiveness longer than SDs. Castrated Ws were also behaviorally more responsive to androgen replacement than were SDs. Ovariectomized W and SD females receiving estrogen replacement displayed a strain difference in hormonal sensitivity. In tests for feminine copulatory behavior, ovariectomized Ws were behaviorally more sensitive to estrogen treatment than SDs. Ovariectomized and estrogen-primed females of both strains displayed potentiated lordotic behavior following chronic PCPA treatment. Concomitant treatment with dexamethasone to reduce adrenal steroid output abolished the potentiation of lordotic behavior found with PCPA treatment. (47 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Accumulation of 14C-lidocaine in the inner ear. Preliminary clinical experience utilizing intravenous lidocaine in the treatment of severe tinnitus

Clinical experience has demonstrated that intravenously administered local anaesthetics have a mitigating effect on severe tinnitus. In an attempt to gain some insight into the mechanism of this effect, autoradiography of the inner ear of young pigmented rats was performed after intravenous injection of 14C-lidocaine. Some accumulation of lidocaine was found in the modiolus, but almost none in the stria vascularis. A large accumulation was observed in other melanincontaining tissues, such as the hair follicles and uvea. The in vitro accumulation of 14C-labelled lidocaine adsorbed on melanin granules was low (12%) as compared with that of other drugs, such as kanamycin (89%) and chloroquine (85%). These autoradiographic results indicate that lidocaine has an effect upon the inner ear, in addition to its previously demonstrated effect on the CNS.     

Radiation therapy of nasopharyngeal carcinoma in East Africa

Results of irradiation, 1 to 3 years after treatment, are presented in 64 cases of nasopharyngeal carcinoma in East Africans. Two types of anatomic point indices are presented. Both correlate well with the results. Prophylactic irradiation of the mediastinum and both axillae was not followed by any evident improvement of the results.     

Partially relaxed multiquantum well InGaAs/AlGaAs heterojunctionphototransistor operating at 955-970 nm

The authors report a partially relaxed InGaAs multiquantum well based heterojunction phototransistor with high responsivity in the transmission window of the GaAs substrate which shows no degradation in performance due to lattice relaxation. The peak responsivity increased from 10 A/W at 0.5 μW incident optical power to 100 A/W at 50 μW corresponding to a current gain of 925. At 8 V collector-emitter voltage the responsivity is constant from 957 to 973 nm, with a responsivity of 5 A/W at 0.5 μW and 55 A/W at 50 μW     

Tunable superlattice p-i-n photodetectors: characteristics, theory,and application

Extended measurements and theory on the recently developed monolithic wavelength demultiplexer consisting of voltage-tunable superlattice p-i-n photodetectors in a waveguide confirmation are discussed. It is shown that the device is able to demultiplex and detect two optical signals with a wavelength separation of 20 nm directly into different electrical channels at a data rate of 1 Gb/s and with a crosstalk attenuation varying between 20 and 28 dB, depending on the polarization. The minimum acceptable crosstalk attenuation at a data rate of 100 Mb/s is determined to be 10 dB. The feasibility of using the device as a polarization angle sensor for linearly polarized light is also demonstrated. A theory for the emission of photogenerated carriers out of the quantum wells is included, since this is potentially a speed limiting mechanism in these detectors. It is shown that a theory of thermally assisted tunneling by polar optical phonon interaction is able to predict emission times consistent with the observed temporal response