10 research outputs found
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A RISC-V Vector Processor With Simultaneous-Switching Switched-Capacitor DC-DC Converters in 28 nm FDSOI
This work demonstrates a RISC-V vector microprocessor implemented in 28 nm FDSOI with fully integrated simultaneous-switching switched-capacitor DC-DC (SC DC-DC) converters and adaptive clocking that generates four on-chip voltages between 0.45 and 1 V using only 1.0 V core and 1.8 V IO voltage inputs. The converters achieve high efficiency at the system level by switching simultaneously to avoid charge-sharing losses and by using an adaptive clock to maximize performance for the resulting voltage ripple. Details about the implementation of the DC-DC switches, DC-DC controller, and adaptive clock are provided, and the sources of conversion loss are analyzed based on measured results. This system pushes the capabilities of dynamic voltage scaling by enabling fast transitions (20 ns), simple packaging (no off-chip passives), low area overhead (16%), high conversion efficiency (80%-86%), and high energy efficiency (26.2 DP GFLOPS/W) for mobile devices
Quantitative Trait Loci (QTL)-Guided Metabolic Engineering of a Complex Trait
Engineering
complex phenotypes for industrial and synthetic biology
applications is difficult and often confounds rational design. Bioethanol
production from lignocellulosic feedstocks is a complex trait that
requires multiple host systems to utilize, detoxify, and metabolize
a mixture of sugars and inhibitors present in plant hydrolysates.
Here, we demonstrate an integrated approach to discovering and optimizing
host factors that impact fitness of <i>Saccharomyces cerevisiae</i> during fermentation of a <i>Miscanthus x giganteus</i> plant hydrolysate. We first used high-resolution Quantitative Trait
Loci (QTL) mapping and systematic bulk Reciprocal Hemizygosity Analysis
(bRHA) to discover 17 loci that differentiate hydrolysate tolerance
between an industrially related (JAY291) and a laboratory (S288C)
strain. We then used this data to identify a subset of favorable allelic
loci that were most amenable for strain engineering. Guided by this
“genetic blueprint”, and using a dual-guide Cas9-based
method to efficiently perform multikilobase locus replacements, we
engineered an S288C-derived strain with superior hydrolysate tolerance
than JAY291. Our methods should be generalizable to engineering any
complex trait in <i>S. cerevisiae</i>, as well as other
organisms