Sax1 (previously CHox3) is a chicken homeobox gene belonging to the same homeobox gene family as the Drosophila NK1 and the honeybee HHO genes. Sax1 transcripts are present from stage 2 H&H until at least 5 days of embryonic development. However, specific localization of Sax1 transcripts could not be detected by in situ hybridization prior to stage 8-, when Sax1 transcripts are specifically localized in the neural plate, posterior to the hindbrain. From stages 8- to 15 H&H, Sax1 continues to be expressed only in the spinal part of the neural plate. The anterior border of Sax1 expression was found to be always in the transverse plane separating the youngest somite from the yet unsegmented mesodermal plate and to regress with similar dynamics to that of the segregation of the somites from the mesodermal plate. The posterior border of Sax1 expression coincides with the posterior end of the neural plate. In order to study a possible regulation of Sax1 expression by its neighboring tissues, several embryonic manipulation experiments were performed. These manipulations included: removal of somites, mesodermal plate or notochord and transplantation of a young ectopic notochord in the vicinity of the neural plate or transplantation of neural plate sections into the extraembryonic area. The results of these experiments revealed that the induction of the neural plate by the mesoderm has already occurred in full primitive streak embryos, after which Sax1 is autonomously regulated within the spinal part of the neural plate.
Collisions of highly anharmonic, weakly bound quantum clusters with atoms and molecules were studied by time-dependent calculations. Collinear collision models were assumed, and systems studied included (H2)2, (D2)2, B-H2, (H2)3, (D2)3 in encounters with Li atoms or H2 molecules. Substantial survival probabilities of the clusters were found, even for collision energies which exceed the cluster binding energy by orders of magnitude. The results are interpreted in terms of the vibrational wave-function of the target cluster, which gives a relatively low weight for the configurations most favorable for collision induced dissociation.
This paper examines the role of science parks as ‘seedbeds’ of innovation. Making the distinction between the spatial and the behavioural conceptions of the seedbed metaphor, the paper surveys the evidence related to the limited interaction effects between science park firms on the one hand and their neighbouring park firms, local universities and off-park firms on the other. This suggests that science parks might be functioning as ‘enclaves’ of innovation rather than seedbeds.
This hypothesis is empirically tested on the basis of a survey of over 160 high-technology firms in Israel located both on and off-park. Specifically, the following questions are addressed: (1) are seedbed effects important inputs to a firm's innovation level? and (2) to what extent are these effects contingent on the physical proximity and clustering afforded by science park location? The results indicate that, first, seedbed effects, as indicated by level of interaction with a local university and the entrepreneur's educational background, are not necessarily related to the firm's innovative level; second, science park location is shown to have only a weak and indirect relationship with innovation level. It is proposed that the role of the science park is thus innovation-entrenching rather than innovation-inducing. The attraction of science park location could therefore be due to perceived status and prestige conferred rather than benefits in terms of technology transfer and information flow.
The communities of the western Sephardi Diaspora were founded by Conversos who had returned to Judaism and who were not familiar with any other form of Judaism other than the one they themselves were attempting to create. It was only natural that the shaping of a new Jewish identity was of central concern to the leaders of these communities who faced a long list of problems inherent in this return to Judaism. This article deals with one of the main problems facing the leadership of the Sephardi communities in Western Europe – the refusal of a significant number of Conversos to be circumcized. Among those Conversos who refused to be circumcized were those who did not want to commit themselves completely to the Jewish religion, along with those who had still not foregone the idea of returning to Spain and Portugal. The latter group's reluctance was based on their fear that their circumcision might be discovered by the leaders of the Inquisition, thereby endangering their lives. The syn
An attractive and challenging approach to the construction of robust, thin film materials with large second-order optical nonlinearities is the covalent self-assembly of aligned arrays of high-(beta) molecular chromophores into multilayer superlattices. In this paper, we describe the dispersion of the large second harmonic generation (SHG) response in a self-assembled film containing stilbazolium chromophore building blocks. We also describe a new approach to fabricating SHG waveguides with such materials as well as preliminary confirmatory experimental results.
1993
דניאל מ סוטשינסקי. 1993. “..” ציון: רבעון לחקר תולדות ישראל, Pp. 369. Publisher's Version
We studied the effects of faking biodata test items by randomly warning 214 of 429 applicants for a nurse's assistant position against faking. While the warning mitigated the propensity to fake, the specific warning effects depended on item transparency. For transparent items, warning reduced the extremeness of item means and increased item variances. For nontransparent items, warning did not have an effect on item means and reduced item variances. These faking effects were best predicted when transparency was operationalized in terms of item-specific job desirability in addition to the item-general social desirability. We also demonstrated a psychometric principle: The effect of warning on means at the item level is preserved in scales constructed from those items, but the effect on variances at the item level is masked at the scale level. These results raise new questions regarding the attenuating effects of faking on validity, and regarding the benefit of warning applicants against faking.
Focuses on the Buber-Rosenzweig translation of the bible. Need for biblical translation that is customary and familiar with the 20th century generation; Reflection of the links between German culture and Jewish tradition; Traditional Jewish sources; Influence of early German Romanticism.
