منابع مشابه
A floral boost
It was in a greenhouse in Oakland, California in 1989 that I began to question what I thought I knew about the use of transgenes in agriculture. I had been urged to look at some transgenic petunia plants by a company to which I was a scientific advisor. The plants in front of me had deep purple petals with many white segments. Some of the plants had all-white flowers. The white segments and the...
متن کاملIdentification of a Second Site of Pyrrolizidine Alkaloid Biosynthesis in Comfrey to Boost Plant Defense in Floral Stage1,2[OPEN]
Pyrrolizidine alkaloids (PAs) are toxic secondary metabolites that are found in several distantly related families of the angiosperms. The first specific step in PA biosynthesis is catalyzed by homospermidine synthase (HSS), which has been recruited several times independently by duplication of the gene encoding deoxyhypusine synthase, an enzyme involved in the posttranslational activation of t...
متن کاملA New Topology of Embedded Z-H Buck-Boost Converter
In this paper, a new embedded Z-H (EZ-H) buck-boost converter is proposed. In this topology, two identical dc voltage sources are embedded in a LC network in a series connection with the inductors. The proposed converter eliminates the shoot-through (ST) switching state and there is no need for a front-end diode. Other advantages of the proposed topology are having capability of buck and boost ...
متن کاملGiving German Universities a Boost
Although well respected, German universities are no longer considered world class. Efforts to rejuvenate the German university system include a competition to confer elite status on the country's ten leading universities.
متن کاملDNA vaccines get a boost
High blood pressure, sepsis, and snake bites might all be cured by the same antidote, according to Schneider et al. (page 2629). High blood pressure and septic shock are both enhanced by a 21–amino acid peptide called ET-1. This peptide is secreted by blood vessel cells that have been activated by inflammatory cytokines. ET-1 triggers the contraction of smooth muscle cells that are wrapped arou...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2000
ISSN: 0960-9822
DOI: 10.1016/s0960-9822(00)00574-1