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- H Li, T F Liu, +4 authors R G Johnson
- The Journal of cell biology
- 1996

During the assembly of gap junctions, a hemichannel in the plasma membrane of one cell is thought to align and dock with another in an apposed membrane to form a cell-to-cell channel. We report here on the existence and properties of nonjunctional, plasma membrane connexin43 (Cx43) hemichannels. The opening of the hemichannels was demonstrated by the… (More)

- Bruno Biais, Thomas Mariotti, +9 authors Ali Lazrak
- 2009

We study a continuous-time principal-agent model in which a risk-neutral agent with limited liability must exert unobservable effort to reduce the likelihood of large but relatively infrequent losses. Firm size can be decreased at no cost, and increased subject to adjustment costs. In the optimal contract, investment takes place only if a long enough period… (More)

- Ivar Ekelandand, Ali Lazrak
- 2006

This paper characterizes differentiable subgame perfect equilibria in a continuous time intertemporal decision optimization problem with nonconstant discounting. The equilibrium equation takes two different forms, one of which is reminescent of the classical Hamilton-Jacobi-Bellman equation of optimal control, but with a non-local term. We give a local… (More)

The object of this paper is to study the mean–variance portfolio optimization in continuous time. Since this problem is time inconsistent we attack it by placing the problem within a game theoretic framework and look for subgame perfect Nash equilibrium strategies. This particular problem has already been studied in [2] where the authors assumed a constant… (More)

- Ali Lazrak, Marie Claire Quenez
- Math. Oper. Res.
- 2003

- A Lazrak, C Peracchia
- Biophysical journal
- 1993

Gap junction conductance (Gj) and channel gating sensitivity to voltage, Ca2+, H+, and heptanol were studied by double whole-cell clamp in Novikoff hepatoma cell pairs. Channel gating was observed at transjunctional voltages (Vj) > +/- 50 mV. The cells readily uncoupled with 1 mM 1-heptanol. With heptanol, single (gap junctional) channel events with unitary… (More)

- A Lazrak, A Peres, S Giovannardi, C Peracchia
- Biophysical journal
- 1994

In Novikoff hepatoma cell pairs studied by double perforated patch clamp (DPPC), brief (20 s) exposure to 20 microM arachidonic acid (AA) induced a rapid and reversible uncoupling. In pairs studied by double whole-cell clamp (DWCC), uncoupling was completely prevented by effective buffering of Cai2+ with BAPTA. Similarly, AA (20 s) had no effect on coupling… (More)

- Jakša Cvitanić, Ali Lazrak, +6 authors Marcin Kacperczyk
- 2004

We derive a closed-form solution for the optimal portfolio of a non-myopic utility maximizer who has incomplete information about the “alphas,” or abnormal returns of risky securities We show that the hedging component induced by learning about the expected return can be a substantial part of the demand. Using our methodology, we perform an “ex ante”… (More)

- Murray Carlson, Ali Lazrak, +8 authors Maryam Rastegar
- 2005

We provide new insights that link compensation structure terms to credit spreads by modeling the dynamic risk choice of a risk-averse manager paid with performance insensitive pay (cash) and performance sensitive pay (stock). The model predicts that credit spreads are increasing in the ratio of cash-to-stock. When the manager is flexible to choose debt… (More)

- Jaksa Cvitaníc, Ali Lazrak, +6 authors Alan Kraus
- 2002

What percentage of their portfolio should investors allocate to hedge funds? The only available answers to the above question are set in a static mean-variance framework, with no explicit accounting for uncertainty on the active manager’s ability to generate abnormal return, and usually generate unreasonably high allocations to hedge funds. In this paper,… (More)