Showing papers by "Bar-Ilan University published in 1974"
TL;DR: Using a combinatorial lemma on regular sets, and a technique of attaching a control unit to a parallel battery of finite automata, a simple and transparent development of McNaughton's theory of automata on @w-tapes is given.
238 citations
79 citations
TL;DR: The identification of macrophages-monocytes and of eosinophils was based on light, phase-contrast, and electron microscopy, the strong positive reaction of α-naphthyl acetate esterase in the macrophage-monocyte, and the positive stain with Luxol Fast Blue, eos in, and peroxidase of the eosInophils.
78 citations
TL;DR: In this article, the allenic sulphones produced by the rearrangement of the α-monosubstituted propargyl esters were found to exhibit a relatively low sensitivity to the effect of solvent ionizing power and substituents.
42 citations
TL;DR: Natural, mixed algal populations grew well in artificial culture media of different pH levels between 5 and 12, causing marked changes in the pH of the culture media, raising the low pH values and lowering the high ones.
Abstract: Natural, mixed algal populations grew well in artificial culture media of different pH levels between 5 and 12. Algal growth caused marked changes in the pH of the culture media, raising the low pH values and lowering the high ones. Within 3–4 weeks all cultures reached the pH range of 8.5–11.0, while sterile controls retained a much wider range of 4.0–10.0. Final pH values were temperature dependent, as also was the rate of the pH change.
41 citations
TL;DR: In this article, first degree stochastic dominance rules for uncertain options distributions of returns have been developed for the following two cases: a multi-period additive utility functions, b univariate utility functions and compound distributions of return.
Abstract: First degree stochastic dominance rules for uncertain options distributions of returns have been developed for the following two cases: a multi-period additive utility functions, b univariate utility functions and compound distributions of returns. In the first case, the suggested rule is a necessary and sufficient criterion for efficiency analysis, while in the second case we provide only sufficiency conditions for dominance.
For the univariate case an efficient set of portfolios can be constructed for investment groups that differ in their investment horizon. Where returns over time are independent, the longer the investment horizon the smaller the efficient set. However, the relationship between the size of the efficient set and the investment horizon is not simple when interdependence of returns is allowed.
39 citations
TL;DR: In this article, a new type of trial function is introduced which explains both the large deviations from Matthiessen's rule observed for the low-temperature electrical resistivity of the polyvalent metals, as well as the absence of such deviations for the alkali metals.
Abstract: A new type of trial function is introduced which explains both the large deviations from Matthiessen's rule observed for the low-temperature electrical resistivity of the polyvalent metals, as well as the absence of such deviations for the alkali metals. Excellent quantitative agreement between theory and experiment is obtained for the resistivity of aluminum, both as a function of temperature and as a function of residual resistivity.
36 citations
TL;DR: In this article, a well-known model of ferroelectricity in potassium dihydrogen phosphate type crystals is extended to provide a description of observed transverse susceptibility in K${\mathrm{H}}_{2}$P${O}}_{4}$ and K${H}$AsP{O}$
Abstract: A well-known model of ferroelectricity in potassium dihydrogen phosphate type crystals is extended to provide a description of observed transverse susceptibility in K${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ and K${\mathrm{H}}_{2}$AsP${\mathrm{O}}_{4}$, the temperature dependence of which exhibits the expected antiferroelectric characteristics. Experimental data can be used in principle to determine the bond-bond interaction parameter $J$ and the tunneling integral $\ensuremath{\Gamma}$. Available data provide satisfactory order-of-magnitude results, and are in qualitative agreement with determinations based on other experiments with regard to the relative values of $\ensuremath{\Gamma}$ in two isomorphs. It is shown that more refined experimental data would contribute to a further understanding of this example of simultaneous ferroelectricity and antiferroelectricity in a single medium.
32 citations
TL;DR: In this paper, three features of E.S.C.A. spectra are discussed: the chemical shift, multiplet splitting, and satellite bands, and it is shown that the electronic relaxation energy in the hole state of the molecules can be attributed to a flow of electrons on to the ionized atom.
30 citations
TL;DR: One hundred and twenty-five adolescent boys from five schools rated all pairs of 12 representative job names for overall similarity, and then ranked them for preference and prestige as mentioned in this paper, and found that group preference rankings were well represented by an ideal job-point within the structure.
30 citations
TL;DR: Epidemics ofSphaerotheca fuliginea on squash in growth chambers developed somewhat better under dry than under humid conditions, and information is presented on the effects of temperature on colonization and sporulation.
Abstract: Epidemics ofSphaerotheca fuliginea on squash in growth chambers developed somewhat better under dry than under humid conditions. The reason appeared to be the differing effects of humidity on the various stages of disease development: dryness favored processes of colonization, sporulation and dispersal, while high humidity favored infection and conidial survival. However, all these processes will occur under conditions of humidity far from their respective optima, thus enabling the development ofS. fuliginea under widely dissimilar conditions. Information is presented on the effects of temperature on colonization and sporulation.
TL;DR: The effect of methotrexate (MTX) on transformation and mitosis of normal lymphocyte cultures was investigated, with the number of cells undergoing division directly proportional to the quantity of folinic acid added.
TL;DR: It is postulated that the binding of free hormone as well as its total content are of major physiological importance in the process of bud dormancy break.
TL;DR: In this article, the low-temperature electrical resistivity of potassium is calculated and compared with the recent, highly accurate measurements in the range 2-20 \ifmmode^\circ\else\textdegree\fi{}K. Excellent agreement with experiment is obtained.
Abstract: The low-temperature electrical resistivity of potassium is calculated and compared with the recent, highly accurate measurements in the range 2-20 \ifmmode^\circ\else\textdegree\fi{}K. Excellent agreement with experiment is obtained. It is found that explicity including phonon drag accounts precisely for the exponential temperature dependence observed for the resistivity below 4 \ifmmode^\circ\else\textdegree\fi{}K. We show how to determine the screened electron-ion interaction matrix elements, crucial for obtaining quantitative agreement with experiment for a resistivity calculation in the low-temperature regime. A discussion is given showing in detail how the present calculated results for potassium are in quantitative agreement with the general theory of the low-temperature resistivity of the alkali metals.
TL;DR: The absorption, fluorescence, and phosphorescence of a series of estrogens is reported and in all keto‐estrogens with the exception of equilenin there is a very strong transfer of excitation energy from the A ring chromophore to the keto group.
Abstract: A series of 10 estrogens was tested for fluorescence phoshorescence and absorption properties. The steroidal frame of estradiol and estriol did not appear to affect the luminescence of the chromophore. The keto-estrogens showed a very strong transfer of excitation energy to the keto group from the A ring. 6-keto-estradiol showed a very peculiar excitation spectrum apparently due to the rigidity of the steroidal frame. Tables and graphs detail properties of many of the individual compounds.
TL;DR: In this paper, it was shown that a cholesteric liquid crystal, between parallel confining plates of spacing $2L, prepared in the "storage mode" (helix axis parallel to plates) undergoes a transition to the nematic state when $L$ is decreased to a critical value
Abstract: It is shown that a cholesteric liquid crystal, between parallel confining plates of spacing $2L$, prepared in the "storage mode" (helix axis parallel to plates) undergoes a transition to the nematic state when $L$ is decreased to a critical value ${L}_{c}$. For $0l\frac{(L\ensuremath{-}{L}_{c})}{{L}_{c}}\ensuremath{\ll}1$ the pitch of the cholesteric helix diverges as $\mathrm{ln}(L\ensuremath{-}{L}_{c})$.
TL;DR: The self-interacting, self-avoiding lattice walk model of a polymer chain has been studied by exact enumeration of short chain configurations as discussed by the authors, and the apparent development of a divergence in the specific heat as the chain length is increased indicates a phase transition in the infinite chain limit.
TL;DR: Dwarf-colony (D) variants of Staphylococcus aureus are relatively widespread etiological agents of bovine mastitis in Israel and it is assumed that the information for these three functions exists on a polycistronic operon.
Abstract: Dwarf-colony (D) variants of Staphylococcus aureus are relatively widespread etiological agents of bovine mastitis in Israel. D strains grow on ordinary solid nutrient media with pinpoint, transparent colonies. An epidemiological study indicated that these variants are more communicable than normal (N) S. aureus strains. Biochemically, several types of metabolic defects have been demonstrated among the D strains: strains from one herd were pantothenate-less, most of the other isolates were thiamine-less, and a few of them were both thiamine-and pantothenate-less. Among the thiamineauxotrophs were a few (from one herd) which were unable to concentrate thiamine-thiazole, whereas all of the other strains required thiamine-pyrimidine (HMP) in the form of pyrophosphate (HMP-PP). At least some of these D strains were defective in three functions: concentrative uptake of HMP, phosphorylation of HMP, and phosphorylation of HMP-monophosphate. Since mutants with normal growth occurred readily, we assumed that the information for these three functions exists on a polycistronic operon. Quantitative requirements for HMP-PP varied highly among the D strains, and other data also indicated that HMP-PP-requiring strains had not developed from a common source.
TL;DR: The identity of chrysanthemaxanthin as a major pigment in avocado pulp has been confirmed by MS and the identity of neoxanthin similarly established and a carbonyl pigment was identified as 3-hydroxy-sintaxanth in a new UV fluorescent apocarotenoids isolated.
TL;DR: In this article, the triples on ν marks were partitioned into q sets, each forming a BIBD of parameters (ν,3,2). But the results of the partitioning were not discussed.
Abstract: Letq=6t±1, ν=2q+2. The (ν/3) tri ples on ν marks may be partitioned intoq sets, each forming a BIBD of parameters (ν,3,2). Related results, some of them known, are also discussed briefly.
TL;DR: This paper showed that trichloromethanesulfenate anion can either recombine with the cation to give sulfoxide, or further dissociate to dichlorosulfine and chloride ion, which gives the benzyl chloride.
TL;DR: Considerable genetic variation was apparent for asymptotic pressing rates under CRF as well as discrimination performance, however, the highest discrimination ratios were achieved by mice with the lowest pressing rates.
Abstract: Mice from four inbred strains and a heterogeneous line were first reduced to 90% of their ad libitum body weight and were then trained to press a bar to obtain food pellets. After 9 days of training with a continuous schedule of reinforcement (CRF), mice were required to discriminate between conditions of reward and nonreward as indicated by a tone and a light; discrimination training continued for 21 days. Considerable genetic variation was apparent for asymptotic pressing rates under CRF as well as discrimination performance. However, the highest discrimination ratios were achieved by mice with the lowest pressing rates. Results are discussed in terms of associative and nonassociative processes which may contribute to genetic variation in performance on learning tasks.
TL;DR: The growth of Staphylococcus aureus 111 was inhibited by aliphatic alcohols, and enzyme synthesis by the bacteria was decreased, but there was no demonstrable inhibition of enzyme already formed.
Abstract: Summary. The growth of Staphylococcus aureus 111 was inhibited by aliphatic alcohols. The extent of inhibition by primary n-alcohols increased with the elongation of the chain. Secondary alcohols were less inhibitory than the corresponding primary alcohols. The inhibitory effect was influenced by the distance of the hydroxyl group from the end of the carbon chain. When the alcohols were added to the medium in sub-inhibitory amount, enzyme synthesis by the bacteria was decreased, but there was no demonstrable inhibition of enzyme already formed.
TL;DR: The presence o f a gonactotrophin-sensitive a-denylate eyelase in ~al 'testis ~ t o~hondr i a I 9 ] .
TL;DR: With these sera, cross-reacting antigens were demonstrated in the following fractions obtained from tetracycline-resistant strains: envelopes of E. coli, supernatant fluid of S. typhi, and envelopes and supernatants of Pseudomonas aeruginosa.
Abstract: Antisera produced against envelope fractions of tetracycline-resistant Escherichia coli and supernatant fluid of disrupted cells of tetracycline-resistant Salmonella typhi were adsorbed with the corresponding fractions of susceptible cultures. With these sera, cross-reacting antigens were demonstrated in the following fractions obtained from tetracycline-resistant strains: envelopes of E. coli , supernatant fluid of S. typhi , and envelopes and supernatant fluid of Pseudomonas aeruginosa . These antigens were not demonstrable in the corresponding fractions from tetracycline-susceptible strains. Images
TL;DR: Three electrophoretically distinct forms of phosphoglucomutase were found in rat adipose tissue and the most anodal form, in contrast to the other forms, did not require added Mg 2+ for maximal activity.
TL;DR: In this article, the authors investigated the migration of the excitation energy through the pyrene film, which leads to the sensitized fluorescence of certain guest molecules which are dissolved in the film.
Abstract: Under certain conditions thin films of pyrene can be prepared which exhibit a purely monomer-like fluorescence. This fluorescence is investigated, as well as the migration of the excitation energy through the film which leads to the sensitized fluorescence of certain guest molecules which are dissolved in the film. The influence of the shape of these molecules on the energy transfer is shown.
TL;DR: In this paper, a comparison was made between two measures of somatosensory sensitivity, response probability, and reaction time to electrocutaneous constant current pulses of 350-microsec duration.
Abstract: A comparison was made between two measures of somatosensory sensitivity, response probability, and reaction time to electrocutaneous constant current pulses of 350-microsec duration. The psychometric functions are steeper than those obtained for other sensory modalities. Similarly, the reaction-time/intensity functions are also steeper than those obtained in other modalities, i.e., larger decreases in reaction time as a function of small increases in stimulus intensity. Ss exposed to a broad stimulus range, including high intensities, yield psychometric and reaction time functions displaced into a higher intensity region than when they are exposed to a narrow low-intensity range of stimuli. The data are discussed in terms of a decision-theory model of reaction time.
TL;DR: It is suggested that the high GA levels coupled to low ABA content induce greater lignification on the lower side of the twig and that this tissue is less sensitive to auxin and has a lower growth response than the upper side ofThe twig thus causing a downward inclination of growth.
Abstract: Summary
The possibility that asymmetric hormone distribution causes downward bending of weeping mulberry (Morus alba var. pendula) twigs was investigated. By extraction, bioassay and gas chromatography it was shown that while upper and lower twig sections had no differences in auxin activity, the two sides differed considerably in content of GA and ABA. The lower side contained high levels of endogenous GA while the upper side had higher concentrations of ABA. The significance of these results and their possible role in the weeping habit of tree growth are discussed. It is suggested that the high GA levels coupled to low ABA content induce greater lignification on the lower side of the twig and that this tissue is less sensitive to auxin and has a lower growth response than the upper side of the twig thus causing a downward inclination of growth.