What Factors Determine the Allocation of Aid by Arab Countries and Multilateral Agencies?

This article provides a statistical analysis of the determinants of Arab aid allocation using Heckman's two-step estimator. It is found that poorer, Arab, Islamic and Sub-Saharan African countries are more likely to receive some positive amount of Arab aid (gate-keeping stage). The same is true for countries not maintaining diplomatic relations with Israel as well as those with voting patterns in the United Nations General Assembly similar to Saudi Arabia. Arab and more populous countries also receive a higher share of the total aid allocated (level stage). The same is true for Islamic countries in the case of bilateral aid and countries with voting similarity in the case of multilateral aid. Donor interest, in particular Arab solidarity, plays a clear role at both stages, whereas recipient need as measured by a country's level of income only affects the gate-keeping stage, not the level stage.     

氯胺酮滥用的研究进展

氯胺酮为非竞争性NMDA受体阻断剂,作为一种分离性麻醉药应用于临床,其作用机制复杂,由于其具有一定的致幻作用而被滥用于各种娱乐场所,是目前药物滥用中的一个新问题。本文在阐述氯胺酮的药理学及毒理学特性的基础上,复习了氯胺酮与NMDA受体、多巴胺受体等神经生物学相关受体的相互作用,综述氯胺酮滥用的现状、滥用的可能生理机制及其滥用后的检测方法等方面的研究进展。