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Results 11 to 20 of about 91,424 (147)

Sparsistency and Rates of Convergence in Large Covariance Matrix Estimation. [PDF]

Annals of Statistics, 2007
This paper studies the sparsistency and rates of convergence for estimating sparse covariance and precision matrices based on penalized likelihood with nonconvex penalty functions.
Clifford Lam, Jianqing Fan
semanticscholar +1 more source

Multi‐omics analyses reveal the interaction between colonic microbiota and host in Min and Yorkshire pigs

Animal Research and One Health, EarlyView., 2023
In the present study, we created the weight gain models with Min and Yorkshire pigs and conducted the metagenomics and metabolomics of colon contents and transcriptomics of colon tissue. Further, we revealed the characteristics and functions of the colonic microbiota in Min and Yorkshire pigs and analyzed their interactions with the host. Overall, this
Xiaoyu Huang +6 more
wiley +1 more source

Lipofection: a highly efficient, lipid-mediated DNA-transfection procedure.

Proceedings of the National Academy of Sciences of the United States of America, 1987
A DNA-transfection protocol has been developed that makes use of a synthetic cationic lipid, N-[1-(2,3-dioleyloxy)propyl]-N,N,N-trimethylammonium chloride (DOTMA). Small unilamellar liposomes containing DOTMA interact spontaneously with DNA to form lipid-
P. Felgner +8 more
semanticscholar +1 more source

Ligand exchange and the stoichiometry of metal chalcogenide nanocrystals: spectroscopic observation of facile metal-carboxylate displacement and binding.

Journal of the American Chemical Society, 2013
We demonstrate that metal carboxylate complexes (L-M(O2CR)2, R = oleyl, tetradecyl, M = Cd, Pb) are readily displaced from carboxylate-terminated ME nanocrystals (ME = CdSe, CdS, PbSe, PbS) by various Lewis bases (L = tri-n-butylamine, tetrahydrofuran ...
N. Anderson +3 more
semanticscholar +1 more source

New calcium indicators and buffers with high selectivity against magnesium and protons: design, synthesis, and properties of prototype structures.

Biochemistry, 1980
A new family of high-affinity buffers and optical indicators for Ca2+ is rationally designed and synthesized. The parent compound is 1,2-bis(o-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid (BAPTA), a relative of the well-known chelator EGTA [ethylene ...
R. Tsien
semanticscholar +1 more source

Central charges of 𝒩 = 2 superconformal field theories in four dimensions [PDF]

Journal of High Energy Physics, 2008
We present a general method for computing the central charges a and c of N=2 superconformal field theories corresponding to singular points in the moduli space of N=2 gauge theories. Our method relates a and c to the U(1)_R anomalies of the topologically
A. Shapere, Yuji Tachikawa
semanticscholar +1 more source

Drosophila Muller F Elements Maintain a Distinct Set of Genomic Properties Over 40 Million Years of Evolution

G3: Genes, Genomes, Genetics, 2015
The Muller F element (4.2 Mb, ~80 protein-coding genes) is an unusual autosome of Drosophila melanogaster; it is mostly heterochromatic with a low recombination rate.
Wilson Leung +499 more
semanticscholar +1 more source

On univalent functions defined by a generalized Sălăgean operator

International Journal of Mathematics and Mathematical Sciences, 2004
We introduce a class of univalent functions R n ( λ , α ) defined by a new differential operator D n f ( z ) , n ∈ ℕ 0 = { 0 , 1 , 2 , … } , where D 0 f ( z ) = f ( z ) , D 1 f ( z ) = ( 1 − λ ) f ( z ) + λ z f ′ ( z ) = D λ f ( z ) , λ ≥ 0 , and
F. M. Al-Oboudi
semanticscholar +1 more source

Bis(imino)pyridines fused with 6- and 7-membered carbocylic rings as N,N,N-scaffolds for cobalt ethylene polymerization catalysts.

Dalton Transactions, 2019
The unsymmetrical diketone, 1,2,3,7,8,9,10-heptahydrocyclohepta[b]quinoline-4,6-dione, based on a central pyridine unit fused by both 6- and 7-membered rings, has been synthesized via a sequence of reactions including ruthenium-catalyzed coupling ...
Z. Wang +6 more
semanticscholar +1 more source

Ultrafast Room‐Temperature Nanofabrication via Ozone‐Based Gas‐Phase Metal‐Assisted Chemical Etching for High‐Performance Silicon Photodetectors

Advanced Functional Materials, EarlyView.
Ozone‐based gas‐phase metal‐assisted chemical etching enables unprecedented room‐temperature fabrication of high‐quality silicon nanowires. The superior oxidation potential of O3 drives rapid vertical etching (1 µm min−1) while maintaining exceptional structural integrity. The pristine nanowire surfaces enable high‐performance core‐shell photodetectors
Hyein Cho +11 more
wiley +1 more source

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