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101.
Christopher J. Handley Meng Tuck Mok Mirna Z. Ilic Clair Adcocks David J. Buttle H. Clem Robinson 《Matrix biology》2001,20(8):531-553
Bovine aggrecan was digested with bovine cathepsin D at pH 5.2 under conditions of partial digestion and the resulting aggrecan core protein fragments were separated by electrophoresis on gradient polyacrylamide gels. The fragments were characterized by their reactivity to specific antibodies and by N-terminal amino acid sequencing. It was also demonstrated that cathepsin D cleaved bovine aggrecan at five sites within the core protein, between residues Phe(342)-Phe(343) in the interglobular domain, Leu(1462)-Val(1463) between the chondroitin sulfate attachment regions 1 and 2 and Leu(1654)-Val(1655), Phe(1754)-Val(1755) and Leu(1854)-Ile(1855) that are located within the chondroitin sulfate attachment region 2 of the core protein. The time course of digestion showed that there was a continued degradation of aggrecan and there was no preferential cleavage of the core protein at any one site. It was shown that cathepsin D digested aggrecan over the pH range 5.2-6.5 resulting in the same products. When bovine cartilage was maintained in explant culture at pH 5.2 there was a rapid loss of both radiolabeled and chemical pools of sulfated glycosaminoglycans into the culture medium and this loss was inhibited by the inclusion in the medium of the aspartic proteinase inhibitor, pepstatin A. The aggrecan core protein fragments appearing in the medium of cultures maintained at pH 5.2 were characterized and it was shown that the fragments had N-terminal sequences starting at Phe(343), Ile(1855), and Val(1755) or Val(1463). This work demonstrates that cathepsin D present within the extracellular matrix of articular cartilage has the potential to contribute to the proteolytic processing of the core protein of aggrecan in this tissue. 相似文献
102.
103.
Goran Radenkovic Ivan Ilic Dragoljub Zivanovic Slobodan Vlajkovic Vladimir Petrovic Olivera Mitrovic 《Cell and tissue research》2010,340(3):427-436
Interstitial cells of Cajal (ICC) are morphologically and functionally intercalated between the elements of the enteric nervous
system and the smooth muscle cells (SMCs) in the musculature of the digestive tract. Kit immunohistochemistry reliably identifies
the location of these cells and provides information on changes in ICC distribution and density. Human oesophagus specimens
(7 embryos, 23 fetuses at 7-27 weeks gestational age; both sexes) were exposed to Kit antibodies to determine ICC differentiation.
Enteric plexuses were examined immunohistochemically by using anti-neuron-specific enolase, whereas the differentiation of
SMCs was studied with antibodies against α-smooth-muscle actin and desmin. By week 7, c-kit-immunopositive cells were present
along the entire oesophagus in the form of an uninterrupted layer around the myenteric plexus (MP) elements. From the beginning
of the 3rd month, the number of ICC progressively decreased around the MP ganglia but increased within the muscle layers.
Concomitantly, differences in the number and distribution of ICC were established in the various portions of the oesophagus:
specifically, ICC were abundant in the lower portion, less numerous in the middle region and rare in the upper part. By the
5th month of development, the relationship as found in later developmental stages had been established: C-kit IR ICC were
present within the circular muscle layer, within the longitudinal layer and in the connective septa surrounding the muscle
bundles but were completely missing around the MP ganglia. 相似文献
104.
Ivana Moric Sanja Bajkic Miloje Savic Tatjana Ilic Tomic Graeme L. Conn Branka Vasiljevic 《The protein journal》2009,28(7-8):326-332
The mechanism of resistance to aminoglycosides based on methylation of their target, 16S rRNA, was until recently described only in antibiotic producing microorganisms. However, equivalent methyltransferases have now also been identified among numerous clinical Gram-negative pathogenic isolates. We have cloned, expressed, and purified GrmA, the aminoglycoside-resistance methyltransferase from Micromonospora purpurea, producer of gentamicin complex. Two vectors were created that express protein with an N-terminal 6× histidine tag with and without an enterokinase recognition producing proteins His6-EK-GrmA and His6-GrmA, respectively. The activity of both recombinant proteins was demonstrated in vivo. After optimized expression and native purification both protein variants proved to be active in in vitro methylation assays. This work lays a foundation for future detailed biochemical, structural and pharmacological studies with this member of an important group of aminoglycoside-resistance enzymes. 相似文献