434 Glutamate Receptor–Like Genes Form
Ca2+ Channels in Pollen Tubes and Are
Regulated by Pistil D-Serine
E. Michard et al.
Amino acid modulation of Ca2+ signaling
guides growth of plant pollen tubes.
438 Polarized Gamma-Ray Emission
from the Galactic Black Hole Cygnus X-1
P. Laurent et al.
This gamma-ray emission originates from
a jet of relativistic particles that is formed
in close proximity to the black hole.
>> Perspective p. 429
439 Selective, Nickel-Catalyzed Hydrogenolysis
of Aryl Ethers
A. G. Sergeev and J. F. Hartwig
A catalyst that cleaves aryl-oxygen bonds
but not carbon-carbon bonds may help
improve lignin processing.
443 High-Performance Electrocatalysts
for Oxygen Reduction Derived from
Polyaniline, Iron, and Cobalt
G. Wu et al.
Fuel cell catalysts synthesized from abundant
metals approach the performance and
durability of platinum at lower cost.
>> Science Podcast
448 Highly Regioselective Amination
of Unactivated Alkanes by Hypervalent
M. Ochiai et al.
A highly reactive bromine-based reagent
can add nitrogen to hydrocarbons without
the need for metal catalysts.
451 Global Trends in Wind Speed
and Wave Height
I. R. Young et al.
Wind speeds over the world’s oceans have
increased over the past two decades,
as have wave heights.
455 Latitudinal Gradients in Greenhouse
Seawater δ18O: Evidence from Eocene
Sirenian Tooth Enamel
M. T. Clementz and J. O. Sewall
Tooth enamel from fossil marine mammals
shows that the middle latitudes were wetter
in the past than they are today.
>> Perspective p. 430
pages 429 & 438
Hippo Pathway Inhibits Wnt Signaling
to Restrain Cardiomyocyte Proliferation
and Heart Size
T. Heallen et al.
Heart size is controlled through an
antagonistic interaction between Hippo
and Wnt signaling pathways.
>> Perspective p. 426
Protein Tyrosine Kinase Wee1B Is Essential
for Metaphase II Exit in Mouse Oocytes
J. S. Oh et al.
Cyclin degradation is not the only mechanism
that controls the exit of mouse oocytes from
A Midzone-Based Ruler Adjusts
Chromosome Compaction to
Anaphase Spindle Length
G. Neurohr et al.
The degree of chromosome condensation
can be modulated within cells to ensure
DNA Synthesis Generates Terminal
Duplications That Seal End-to-End
M. R. Lowden et al.
The fate of chromosomes that become
catastrophically fused at their ends
is revealed in the nematode worm.
Mammalian Genes Are Transcribed with
Widely Different Bursting Kinetics
D. M. Suter et al.
Real-time monitoring of gene expression
reveals transcription kinetics of mammalian
Real-Time Observation of Transcription
Initiation and Elongation on an
Endogenous Yeast Gene
D. R. Larson et al.
In yeast, the initiation of gene expression is
stochastic and is controlled by transcription
factor search times.
>> Perspective p. 431
The Growth Factor Progranulin Binds
to TNF Receptors and Is Therapeutic
Against Inflammatory Arthritis in Mice
W. Tang et al.
A growth factor protects against arthritis
in mice by blocking tumor necrosis
>> Perspective p. 427
Proteoglycan-Specific Molecular Switch for
RPTPσ Clustering and Neuronal Extension
C. H. Coles et al.
One receptor binds two different types
of proteoglycan at the same site but
with divergent outcomes.
CONTENTS continued >>