A rigidity theorem that applies to smooth electrovac spacetimes which represent either (A) an asymptotically flat stationary black hole or (B) a cosmological spacetime with a compact Cauchy horizon ruled by closed null geodesics was given in a recent work [5]. Here we enlarge the framework of the corresponding investigations by allowing the presence of other type of matter fields. In the first ...

Let M be a closed non-positively curved Riemannian (NPCR) mani-fold, ˜ M its universal cover, and X an ultralimit of˜M. For γ ⊂ ˜ M a geodesic, let γ ω be a geodesic in X obtained as an ultralimit of γ. We show that if γ ω is contained in a flat in X, then the original geodesic γ supports a non-trivial, normal, parallel Jacobi field. In particular, the rank of a geodesic can be detected from th...

We present a comparative study in which 'pebble game' rigidity analysis is applied to multiple protein crystal structures, for each of six different protein families. We find that the main-chain rigidity of a protein structure at a given hydrogen bond energy cutoff is quite sensitive to small structural variations, and conclude that the hydrogen bond constraints in rigidity analysis should be c...

The states of penile erection have not been quantified to establish their relationship to intracorporal fluid pressure and to soft tissue constraint. Computer-based circumferential rigidity sensing during erectile cycles now permits circumferential size and rigidity characterization. Measurements during dynamic infusion cavernometry and cavernosography relate intracorporal pressure and axial ri...

For non-rigid registration, the objects in medical images are usually treated as a single deformable body with homogeneous stiffness distribution. However, this assumption is invalid for certain parts of the human body, where bony structures move rigidly, while the others may deform. In this paper, we introduce a novel registration technique that models local rigidity of pre-identified rigid st...

One of the most perplexing factors in the Japanese financial crisis is the apparently non-optimal and non-rational behaviour of Japanese banks. In this article, we provide a “rational” explanation for bank behaviour based on the long-term relationships between banks and entrepreneurs and show that they result in “rational rigidity” in lending. We find three implications of rational rigidity – a...

AND GENERIC RIGIDITY IN THE PLANE SACHIN PATKAR, BRIGITTE SERVATIUS, AND K. V. SUBRAHMANYAM Abstract. We consider the concept of abstract 2–dimensional rigidity and provide necessary and sufficient conditions for a matroid to be an abstract rigidity matroid of a complete graph. This characterization is a natural extenWe consider the concept of abstract 2–dimensional rigidity and provide necessa...

Cell migration is a complex process requiring density and rigidity sensing of the microenvironment to adapt cell migratory speed through focal adhesion and actin cytoskeleton regulation. ICAP-1 (also known as ITGB1BP1), a β1 integrin partner, is essential for ensuring integrin activation cycle and focal adhesion formation. We show that ICAP-1 is monoubiquitylated bySmurf1, preventing ICAP-1bind...

Rantalainen, Timo Neuromuscular function and bone geometry and strength in aging Jyväskylä: University of Jyväskylä, 2010, 87 p. (Studies in Sport, Physical Education and Health ISSN 0356-1070; 148) ISBN 978-951-39-3959-5 (PDF), 978-951-39-3948-9 (nid.) Diss. Finnish summary Osteoporosis, falls and ensuing bone fractures cause individual suffering and economical burden. Pharmacological interven...

shiftwork is now a major feature of working life across a broad range of industries and circadian rhythms play an important role in shiftwork tolerance. so, the aim of this study was examine the relationships between age, morning-type and rigidity sleeping habits with shiftwork tolerance among shiftworkers of karun oil and gas exploitation company. the sample consisted of 295 shiftworkers of ah...