Elif Hilal Şen

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The sponges produce their skeletal elements and silicateins are the key enzymes in this process. The mechanism underlying the formation of their silica skeleton and its structural properties are of exceptional interest for applications in technology. Micro- and nano-scale structural analysis of the six marine sponges belonging to Demospongiae [Callyspongia(More)
2009, the first net increase in payrolls did not occur until March 2010, eight months into the recovery. In recent months, payroll job growth in the U.S. has picked up (Figure 1). 2 For the first seven months of 2013, payrolls have risen by 193,000 jobs per month, up from 183,000 per month in 2012. But as of July 2013, the U.S. still has 23 percent fewer(More)
BACKGROUND Low adherence to Global initiative for chronic Obstructive Lung Disease (GOLD) guideline recommendations has been reported worldwide. There has been no study on the adherence to GOLD guidelines for COPD treatment in Turkey. OBJECTIVES To investigate the rates of adherence to GOLD 2010 guidelines for COPD treatment among pulmonologists. DESIGN(More)
In this paper, I study long-run population changes across U.S. metropolitan areas. First, I argue that changes over a long period of time in the geographic distribution of population can be informative about the so-called " resilience " of regions. Using the censuses of population from 1790 to 2010, I find that persistent declines, lasting two decades or(More)
T BY ELIF SEN Surveys gather " soft " data in the form of responses from business owners , executives, and managers. These sometimes-subjective responses supplement or confirm the signals being sent by the hard numbers — say, the dollar value of exports or the average number of hours worked per employee — that economists use to measure the performance of a(More)
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