We aim to investigate the IR excess of 45 MW Cepheids combining different observables constrain presence CSE. used SPIPS algorithm, a robust implementation parallax-of-pulsation method that combines photometry, angular diameter, stellar effective temperature, and RV measurements in global modelling pulsation. obtained new photometric at mid-IR with VLT/VISIR complemented literature data. then c...

We have conducted a survey of CN N=2–1 and N=1–0 line emission in the envelopes of evolved stars. The sample consists of 42 objects, including C-rich and O-rich envelopes, S-stars, detached envelopes, and proto-planetary nebulae. Confident detections have been achieved in 30 objects. Both CN lines are bright in C-rich envelopes, and the 2–1 line has been detected in 5 O-rich objects (previously...

In the general setting of Grothendieck categories with enough projectives, we prove theorems that make possible to restrict the study of the problem of the existence of -covers and envelopes to the study of some properties of the class . We then prove the existence of flat covers and cotorsion envelopes of complexes, giving some examples. This generalizes the earlier work (J. Algebra 201 (1998)...

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,...

To evaluate host range differences between two different strains of feline leukemia virus subgroup B (FeLV-B), we compared the binding and infectivity patterns of retrovirus vectors bearing either FeLV-B-90Z or FeLV-B-GA envelopes. We report here that the ability of these envelopes to utilize different Pit1 orthologs is mediated primarily by the receptor binding domain; however, in the case of ...

Flagella of cytoplasm-free envelopes of Escherichia coli or Salmonella typhimurium can rotate in either the counterclockwise or clockwise direction, but they never switch from one direction of rotation to another. Exogenous fumarate, in the intracellular presence of the chemotaxis protein CheY, restored switching ability to envelopes, with a concomitant increase in clockwise rotation. An increa...

We analyze degeneracy of lower envelopes of algebraic surfaces. We focus on the cases omitted in the existing complexity analysis of lower envelopes [Halperin and Sharir 1993], and re-define the degeneracy from the viewpoint of the adjacency structure and the number of connected components. We also define badness of degeneracy from such viewpoint and show how bad the degeneracy can be. This res...

The paradox of two envelopes, one containing twice as much money as the other, is one of several that address logical aspects of probabilistic reasoning. Many presentations of the paradox are resolved by understanding the need to specify the distribution of quantities in the envelopes. However, even if a simple distribution of numbers is known, a new set of reasoning problems arise. The puzzle ...