Inhibin is absent from azoospermic semen of infertile men.

abstract：:A quantum internet that connects remote quantum processors1,2 should enable a number of revolutionary applications such as distributed quantum computing. Its realization will rely on entanglement of remote quantum memories over long distances. Despite enormous progress3-12, at present the maximal physical separation a...

journal_title：Nature

authors： Yu Y,Ma F,Luo XY,Jing B,Sun PF,Fang RZ,Yang CW,Liu H,Zheng MY,Xie XP,Zhang WJ,You LX,Wang Z,Chen TY,Zhang Q,Bao XH,Pan JW

更新日期：2020-02-01 00:00:00

abstract：:Recent observations have revealed streams of gas and stars in the halo of the Milky Way that are the debris from interactions between our Galaxy and some of its dwarf companion galaxies; the Sagittarius dwarf galaxy and the Magellanic clouds. Analysis of the material has shown that much of the halo is made up of canni...

journal_title：Nature

authors： Ibata R,Irwin M,Lewis G,Ferguson AM,Tanvir N

更新日期：2001-07-05 00:00:00

abstract：:The potential use of smallpox as a biological weapon has led to the production and stockpiling of smallpox vaccine and the immunization of some healthcare workers. Another public health goal is the licensing of a safer vaccine that could benefit the millions of people advised not to take the current one because they o...

journal_title：Nature

authors： Earl PL,Americo JL,Wyatt LS,Eller LA,Whitbeck JC,Cohen GH,Eisenberg RJ,Hartmann CJ,Jackson DL,Kulesh DA,Martinez MJ,Miller DM,Mucker EM,Shamblin JD,Zwiers SH,Huggins JW,Jahrling PB,Moss B

更新日期：2004-03-11 00:00:00

abstract：:c-Abl, a non-receptor tyrosine kinase, is activated by agents that damage DNA. This activation results in either arrest of the cell cycle in phase G1 or apoptotic cell death, both of which are dependent on the kinase activity of c-Abl. p73, a member of the p53 family of tumour-suppressor proteins, can also induce apop...

journal_title：Nature

authors： Agami R,Blandino G,Oren M,Shaul Y

更新日期：1999-06-24 00:00:00

abstract：:Homogeneous nucleation and subsequent cluster growth leads to the formation of new aerosol particles in the atmosphere. The nucleation of sulfuric acid and organic vapours is thought to be responsible for the formation of new particles over continents, whereas iodine oxide vapours have been implicated in particle form...

journal_title：Nature

authors： Sipilä M,Sarnela N,Jokinen T,Henschel H,Junninen H,Kontkanen J,Richters S,Kangasluoma J,Franchin A,Peräkylä O,Rissanen MP,Ehn M,Vehkamäki H,Kurten T,Berndt T,Petäjä T,Worsnop D,Ceburnis D,Kerminen VM,Kulmala M,O'D

更新日期：2016-09-22 00:00:00

abstract：:Oestrogens are involved in the growth, development and homeostasis of a number of tissues. The physiological effects of these steroids are mediated by a ligand-inducible nuclear transcription factor, the oestrogen receptor (ER). Hormone binding to the ligand-binding domain (LBD) of the ER initiates a series of molecul...

journal_title：Nature

authors： Brzozowski AM,Pike AC,Dauter Z,Hubbard RE,Bonn T,Engström O,Ohman L,Greene GL,Gustafsson JA,Carlquist M

更新日期：1997-10-16 00:00:00

abstract：:The limited ranges of the wild progenitors of many of the primary European domestic species point to their origins further east in Anatolia or the fertile crescent. The wild ox (Bos primigenius), however, ranged widely and it is unknown whether it was domesticated within Europe as one feature of a local contribution t...

journal_title：Nature

authors： Troy CS,MacHugh DE,Bailey JF,Magee DA,Loftus RT,Cunningham P,Chamberlain AT,Sykes BC,Bradley DG

更新日期：2001-04-26 00:00:00

abstract：:The biosynthesis of several protein cofactors is subject to feedback regulation by riboswitches. Flavin mononucleotide (FMN)-specific riboswitches, also known as RFN elements, direct expression of bacterial genes involved in the biosynthesis and transport of riboflavin (vitamin B(2)) and related compounds. Here we pre...

journal_title：Nature

authors： Serganov A,Huang L,Patel DJ

更新日期：2009-03-12 00:00:00

abstract：:Volcanic eruptions contribute to climate variability, but quantifying these contributions has been limited by inconsistencies in the timing of atmospheric volcanic aerosol loading determined from ice cores and subsequent cooling from climate proxies such as tree rings. Here we resolve these inconsistencies and show th...

journal_title：Nature

authors： Sigl M,Winstrup M,McConnell JR,Welten KC,Plunkett G,Ludlow F,Büntgen U,Caffee M,Chellman N,Dahl-Jensen D,Fischer H,Kipfstuhl S,Kostick C,Maselli OJ,Mekhaldi F,Mulvaney R,Muscheler R,Pasteris DR,Pilcher JR,Salzer M,

更新日期：2015-07-30 00:00:00

abstract：:The formation and guidance of specialized endothelial tip cells is essential for both developmental and pathological angiogenesis. Notch-1 signalling regulates the generation of tip cells, which respond to gradients of vascular endothelial growth factor (VEGF-A). The molecular cues and signalling pathways that control...

journal_title：Nature

authors： Sawamiphak S,Seidel S,Essmann CL,Wilkinson GA,Pitulescu ME,Acker T,Acker-Palmer A

更新日期：2010-05-27 00:00:00

abstract：:Ribosomes are translational machineries that catalyse protein synthesis. Ribosome structures from various species are known at the atomic level, but obtaining the structure of the human ribosome has remained a challenge; efforts to address this would be highly relevant with regard to human diseases. Here we report the...

journal_title：Nature

authors： Khatter H,Myasnikov AG,Natchiar SK,Klaholz BP

更新日期：2015-04-30 00:00:00

abstract：:The elevation history of the Tibetan plateau provides direct insight into the tectonic processes associated with continent-continent collisions. Here we present oxygen-isotope-based estimates of the palaeo-altimetry of late Eocene and younger deposits of the Lunpola basin in the centre of the plateau, which indicate t...

journal_title：Nature

authors： Rowley DB,Currie BS

更新日期：2006-02-09 00:00:00

abstract：: ...

journal_title：Nature

authors： Beekes M,Mielke M,Thomzig A

更新日期：2019-01-01 00:00:00

abstract：:Many chemical and physical systems can occur in two forms distinguished solely by being mirror images of each other. This phenomenon, known as chirality, is important in biochemistry, where reactions involving chiral molecules often require the participation of one specific enantiomer (mirror image) of the two possibl...

journal_title：Nature

authors： Rikken GL,Raupach E

更新日期：2000-06-22 00:00:00

abstract：:When simian virus 40 (SV40) infects host cells, the viral genes are expressed in two phases. Early in infection, the virus genome is transcribed and translated to yield two related proteins, 'large T' and 'small t' antigens. Later the rate of synthesis of the early messenger RNA falls and the viral genes coding for th...

journal_title：Nature

authors： McKay R,DiMaio D

更新日期：1981-02-26 00:00:00

abstract：:Finite element analysis (FEA) is used by industrial designers and biomechanicists to estimate the performance of engineered structures or human skeletal and soft tissues subjected to varying regimes of stress and strain. FEA is rarely applied to problems of biomechanical design in animals, despite its potential to inf...

journal_title：Nature

authors： Rayfield EJ,Norman DB,Horner CC,Horner JR,Smith PM,Thomason JJ,Upchurch P

更新日期：2001-02-22 00:00:00

abstract：:The primary function of the nerve cell is to process electrical signals. Over the past fifteen years there has been renewed interest in the detailed spatial analysis of signalling in individual neurons owing to experimental evidence that the regional electrical properties of neurons are complex. Thus the behaviour of ...

journal_title：Nature

authors： Zecević D

更新日期：1996-05-23 00:00:00

abstract：:Since the discovery of superconductivity in the high-transition-temperature (high-T(c)) copper oxides two decades ago, it has been firmly established that the CuO(2) plane is essential for superconductivity and gives rise to a host of other very unusual properties. A new family of superconductors with the general comp...

journal_title：Nature

authors： Chen TY,Tesanovic Z,Liu RH,Chen XH,Chien CL

更新日期：2008-06-26 00:00:00

abstract：:Clathrin is the structural protein of coated membranes involved in receptor-mediated endocytosis and aspects of Golgi sorting in eukaryotic cells. We have now detected a stoichiometric complex of clathrin with a novel protein of M(r) approximately 100,000 (100K) in lysates of different mammalian cells. Formation of th...

journal_title：Nature

authors： Pleasure IT,Black MM,Keen JH

更新日期：1993-09-30 00:00:00

abstract：:The evolutionary history of extant hominoids (humans and apes) remains poorly understood. The African fossil record during the crucial time period, the Miocene epoch, largely comprises isolated jaws and teeth, and little is known about ape cranial evolution. Here we report on the, to our knowledge, most complete fossi...

journal_title：Nature

authors： Nengo I,Tafforeau P,Gilbert CC,Fleagle JG,Miller ER,Feibel C,Fox DL,Feinberg J,Pugh KD,Berruyer C,Mana S,Engle Z,Spoor F

更新日期：2017-08-09 00:00:00

abstract：:Mammals owe part of their evolutionary success to the harmonious exchanges of information, energy and immunity between females and their offspring. This functional reciprocity is vital for the survival and normal development of infants, and for the inclusive fitness of parents. It is best seen in the intense exchanges...

journal_title：Nature

authors： Schaal B,Coureaud G,Langlois D,Giniès C,Sémon E,Perrier G

更新日期：2003-07-03 00:00:00

abstract：:The Gram-negative bacterium Myxococcus xanthus has a complex life cycle during which large amounts of a protein of relative molecular mass (Mr) 19,000, known as protein S, are assembled into a spore surface coat by a process that specifically requires calcium ions. The gene for protein S has been cloned and the DNA se...

journal_title：Nature

authors： Wistow G,Summers L,Blundell T

更新日期：1985-06-27 00:00:00

abstract：:Mechanotransduction has an important role in physiology. Biological processes including sensing touch and sound waves require as-yet-unidentified cation channels that detect pressure. Mouse Piezo1 (MmPiezo1) and MmPiezo2 (also called Fam38a and Fam38b, respectively) induce mechanically activated cationic currents in c...

journal_title：Nature

authors： Coste B,Xiao B,Santos JS,Syeda R,Grandl J,Spencer KS,Kim SE,Schmidt M,Mathur J,Dubin AE,Montal M,Patapoutian A

更新日期：2012-02-19 00:00:00

abstract：:Retinoic acid is a vitamin A derivative with striking effects on development and cell differentiation. Several nuclear retinoic acid receptors (RARs), acting as ligand-inducible transcription factors, have been characterized and indirect evidence suggests that they have distinct roles. One of the most intriguing prope...

journal_title：Nature

authors： de Thé H,Chomienne C,Lanotte M,Degos L,Dejean A

更新日期：1990-10-11 00:00:00

abstract：:The mechanism whereby eukaryotic pre-messenger RNAs are polyadenylated is unknown. Most models for polyadenylation invoke cleavage of precursor transcripts at the site of poly(A) addition followed by polymerization of A residues by poly(A) polymerase. Analysis of the sequences surrounding poly(A) addition sites has id...

journal_title：Nature

authors： Berget SM

更新日期：1984-05-10 00:00:00

abstract：:Positron emission tomography (PET) measurements of brain blood flow were used to monitor changes in the human primary and secondary somatosensory cortices during the period when somatosensory stimuli were expected. In anticipation of either focal or innocuous touching, or localized, painful shocks, blood flow decrease...

journal_title：Nature

authors： Drevets WC,Burton H,Videen TO,Snyder AZ,Simpson JR Jr,Raichle ME

更新日期：1995-01-19 00:00:00

abstract：:The hypothesis that animal population dynamics may be synchronized by climate is highly relevant in the context of climate change because it suggests that several populations might respond simultaneously to climatic trends if their dynamics are entrained by environmental correlation. The dynamics of many species throu...

journal_title：Nature

authors： Post E,Forchhammer MC

更新日期：2002-11-14 00:00:00

abstract：:Many collective human activities, including violence, have been shown to exhibit universal patterns. The size distributions of casualties both in whole wars from 1816 to 1980 and terrorist attacks have separately been shown to follow approximate power-law distributions. However, the possibility of universal patterns r...

journal_title：Nature

authors： Bohorquez JC,Gourley S,Dixon AR,Spagat M,Johnson NF

更新日期：2009-12-17 00:00:00

abstract：:Medawar has suggested that the major histocompatibility gene complex (MHC) might be involved in the contact inhibition of movement shown by fibroblasts and epithelia. Contact inhibition of movement is that reaction of cells which stops the movement of one cell over another and thus leads to monolayering and other feat...

journal_title：Nature

authors： Curtis AS,Rooney P

更新日期：1979-09-20 00:00:00

abstract：:Data from a rocket experiment show details which were not known from ground-based observations. ...

journal_title：Nature

authors： Sudbury GC,Ingham MF

更新日期：1970-05-09 00:00:00