Xiaoshu Xu

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Phytosulfokine (PSK) is a tyrosine-sulfated peptide that is widely distributed in plants, participating in cell proliferation, differentiation, and innate immunity. The potential role of PSK in nodulation in legumes has not been reported. In this work, five PSK precursor genes were identified in Lotus japonicas, designated as LjPSK1 to LjPSK5. Three of them(More)
We study a sequential auction of two objects with two bidders, where the winner of the package obtains a synergy from the second object. If reselling after the two auctions occurs, it proceeds as either monopoly or monopsony take-it-or-leave-it offer. We find that a post-auction resale has a significant impact on bidding strategies in the auctions: Under(More)
We study how resale affects auctions with costly entry in a model where bidders possess two-dimensional private information signals: entry costs and valuations. We establish the existence of symmetric entry equilibrium and identify sufficient conditions under which the equilibrium is unique. Our analysis suggests that the opportunity of resale affects both(More)
We study how resale affects auctions with costly entry in a model where bidders possess two-dimensional private information signals: entry costs and valuations. We establish the existence of symmetric entry equilibrium and identify sufficient conditions under which the equilibrium is unique. Our analysis suggests that the opportunity of resale induces(More)
American Indians living on reservations have substantially lower levels of employment and income than co-resident non-Indians. Gaming has emerged as an attempt by tribes to improve the socioeconomic status of their members. This paper uses simulated maximum likelihood to estimate the effect of the tribal decision to open a gaming facility on employment of(More)
L-Aspartate-β-semialdehyde dehydrogenase (ASADH) is a key enzyme in the aspartate pathway. In bacteria, ASADH is highly specific for the cofactor NADP(+) rather than NAD(+). Limited information on cofactor utilization is available, and neither the wild-type protein nor the available mutants could utilize NAD(+) efficiently. In this study, we identified(More)
Corynebacterium glutamicum is an important industrial metabolite producer that is difficult to genetically engineer. Although the Streptococcus pyogenes (Sp) CRISPR-Cas9 system has been adapted for genome editing of multiple bacteria, it cannot be introduced into C. glutamicum. Here we report a Francisella novicida (Fn) CRISPR-Cpf1-based genome-editing(More)
We investigate a private value auction in which a single " entrant " on winning imposes a negative externality on two " regular " bidders. In an English auction when all bidders are active, " regular " bidders free ride, exiting before price reaches their values. In a …rst-price sealed-bid auction incentives for free riding and aggressive bidding coexist,(More)