Spin dynamics and four-photon mixing in InSb

The spin flip Raman interaction can be used to excite coherent spin precession in semiconductors. Resonant, four-photon mixing is shown to be equivalent to Raman scattering from this coherent state. Studies of the four-photon intensity give information concerning spin dynamics (T₁ and T₂) in n-InSb.     

Nematic disc-like liquid crystals

We present the first example of disc-like mesogens which present at high temperature a highly fluid mesophase with a nematic optical texture. These nematic disc-like compounds are pure simple component models to study the carbonaceous mesophase.     

(Higgs)2,3 quantum fields in a finite volume

This is the second part of the paper entitled, “(Higgs)_2,3 Quantum Fields in a Finite Volume.” The proof of an upper bound for vacuum energy is completed with the exception of some technical estimates.     

Studium der Mosaikstruktur von Kristallen

Zusammenfassung Nach einer neuen Methode wurde der Beflexionsbereich von KCl-Kristallen gemessen. Es wird gezeigt, dass sich die Reflexion der Röntgen-strahlen auch an Mosaikblöcken von KCl der Reflexion am vollkommenen, Kristall nach der Theorie von Darwin und Ewald nähert.     

Analyse organique fonctionnelle : Combinaisons du dimédon (diméthyl-5,5 cyclohexa-nedione-1,3) avec les aldéhydes

The authors have traced and studied the thermolysis curves of dimedone and of the compounds it forms with 26 very different aldehydes. The purity of the aldehydes have been rigorously checked by infrared spectrography.     

Sonic velocity in two-phase systems

Simple relations for the prediction of the propagation of pressure disturbances in liquid-gaseous two-phase systems are presented. The model applied makes use of the well known pysical behaviour that the sonic velocity in a single-phase fluid is influenced by the elasticy of the confining walls. The novel concept is to consider the interface of the one phase to act as the elastic wall of the other phase and vice versa. The predictions comply well with the experimental data found in the literature.     

Structural variations among the aporphine-benzylisoquinoline dimers

$\text{Thalictrum}$$\text{minus}$ L. var. $\text{microphyllum}$ Boiss. (Ranunculaceae) has yielded (+)-istanbulamine ($\text{5}$) which is the first aporphine-benzylisoquinoline formed from one (+)-reticuline-type unit linked to a (+)-N-methylcoclaurine moiety. Other new dimers also present are (+)-bursanine ($\text{6}$) and (+)-iznikine ($\text{7}$).     

Differential expression of a BMP4 reporter allele in anterior fungiform versus posterior circumvallate taste buds of mice

Background  

Bone Morphogenetic Protein 4 (BMP4) is a diffusible factor which regulates embryonic taste organ development. However, the role of BMP4 in taste buds of adult mice is unknown. We utilized transgenic mice with LacZ under the control of the BMP4 promoter to reveal the expression of BMP4 in the tongues of adult mice. Further we evaluate the pattern of BMP4 expression with that of markers of specific taste bud cell types and cell proliferation to define and compare the cell populations expressing BMP4 in anterior (fungiform papillae) and posterior (circumvallate papilla) tongue.