The sliding singlet

Supersymmetric grand unified models with a sliding singlet are considered. We review the argument that the sliding does not work in models with large supersymmetry breaking. Then we consider the possibility of using a sliding singlet with low-energy supersymmetry breaking. A number of problems with such a program are noted and illustrated in simple examples. Using the experience gained from these examples a realistic model is constructed and analyzed.     

Dinoflagellate neurotoxins related to saxitoxin: Structures of toxins C3 and C4, and confirmation of the structure of neosaxitoxin

By x-ray crystallography of the 11β epimer, toxins C3 and C4 are shown to be 21-sulfo-N-1-hydroxysaxitoxin-11α- and 11β-hydroxysulfate, confirming the position and identity of the 3 substituents which, with the parent compound, form the array of 12 saxitoxins found in $\text{Protogonyaulax}$.     

Theoretical analysis of non-thermal pump effects in broadband CARS spectroscopy

The effect of finite-bandwidth multimode pump lasers in CARS is normally accounted for by an intensity convolution integral based on gaussian (thermal) pump sources. This paper presents a derivation of the convolution integral for non-gaussian pump sources derived from frequency doubling. The modified convolution integral makes it possible to identify regions of insensitivity to pump stochastic properties.     

Combined monaural and binaural masking release

Stimulus conditions were examined where both across-frequency [comodulation masking release (CMR)] and across-ear [binaural masking-level difference (BMLD)] cues were available, as well as conditions where only one of these cue types was available. The main goal of the study was to determine how the two types of cues combine. The effects of comodulation were assessed either by modulating a masking noise and manipulating its bandwidth (experiment 1) or by using two comodulated narrow bands of noise separated in frequency (experiment 2). The masker was always No, and the 500-Hz pure-tone signal was either So or S pi. The effect of the frequency of modulation was examined either by changing the frequency of the modulating stimulus (experiment 1) or by changing the bandwidth of the comodulated narrow-band noise (experiment 2). Four of six subjects showed greater masking release when both BMLD and CMR cues were available than for either type of cue alone, whereas the other two subjects did not show an ability to combine the two cues for additional advantage. For the subjects who were able to combine the two types of cue, the additional advantage was greater for low frequencies of modulation. The results indicate that one component of CMR may be based upon across-frequency envelope comparisons at a stage of processing after binaural analysis.     

Heavy traffic approximations for busy period in an M/G/∞ queue

A necessary and sufficient condition is given for busy period in an M/G/∞ queue to be asymptotically exponential with mean equal to expected busy period, as traffic intensity increases. The case where this condition fails is also investigated, and the results applied.     

Low-energy baryosynthesis

We consider general constraints on baryosynthesis in low-energy SU(3) × SU(2) × U(1) theories. We find in general that phenomenologically acceptable models exist, which are unifiable at higher energies-but which all require exotic fermion content.