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191.
Takahashi H Bekkali Y Capolino AJ Gilmore T Goldrick SE Kaplita PV Liu L Nelson RM Terenzio D Wang J Zuvela-Jelaska L Proudfoot J Nabozny G Thomson D 《Bioorganic & medicinal chemistry letters》2007,17(18):5091-5095
We have recently reported the discovery of a novel class of glucocorticoid receptor (GR) antagonists, exemplified by 3, containing a 1,2-dihydroquinoline molecular scaffold. Further SAR studies of these antagonists uncovered chemical modifications conveying agonist functional activity to this series. These agonists exhibit good GR binding affinity and are selective against other nuclear hormone receptors. 相似文献
192.
Ljiljana Nikolić Katarina Čobanović Dejana Lazić 《Central European Journal of Biology》2007,2(1):156-168
Sixty-five plant species have been found in Lake Provala (the Vojvodina Province, Serbia) and its riparian zone. Among them,
three hydrophytes were dominant: Nymphoides peltata, Myriophyllum spicatum and Ceratophyllum demersum. As interactions between different ecological factors, especially light, temperature and nutrient level, are of prime importance
for productivity of macrophytes, we analyzed the main physical and chemical indicators of water quality in the studied location.
In the vegetation period of the year 2000, the dominant hydrophytes were analyzed for biomass production dynamics in the studied
aquatic ecosystem, including fresh weight (FW), dry weight (DW) and ash free dry weight (AFDW). The studied plant species
achieved maximum biomass production in June, with statistical differences among the species at the significance level of α = 0.05. 相似文献
193.
Jovic Srdjan Guresic Dejan Babincev Ljiljana Draskovic Nenad Dekic Vidosav 《Bioprocess and biosystems engineering》2019,42(10):1695-1699
Bioprocess and Biosystems Engineering - An accurate and reliable forecast of biosurfactant production with minimum error is useful in any bioprocess engineering. Bacterial isolate FKOD36 capable of... 相似文献
194.
Aspergillopepsin I, an acid protease, was purified using an aqueous two-phase system that comprised various combinations of
polyethylene glycol (PEG), NaH2PO4 and NaCl. Partition of the enzyme depended upon the molecular mass of the PEG and the presence of NaCl. With PEG 1500, 4000
and 6000, the partition coefficients were increased by 1,500-, 1,800- and 560-fold compared to values without NaCl. The presence
of NaCl (8.75%, w/w) increased purification by 3.8, 9.5 and 2.8 times into these respective PEGs. The optimal aqueous two-phase
system for acid protease purification was developed using response surface methodology. This system contained 17.3% of PEG
4000 (w/w), 15% NaH2PO4 (w/w) and 8.75% NaCl (w/w) and provided the best partition coefficient (Ke > 1,100) and yield over 99% in the same phase. The optimal ATPS purification factor of acid protease was over 5. 相似文献
195.
Anton Švajger Ljiljana Kostović-Knežević Želimir Bradamante Mercedes Wrischer 《Development genes and evolution》1985,194(7):429-432
Summary The formation of the tail portion of the primitive gut was investigated by light and electron microscopy in 10- and 11-day rat embryos. The observations permit the conclusion that the tail gut does not form as a posterior extension of the hindgut but originates from the tail bud mesenchyme by mechanism analogous to the secondary neurulation. It includes cell condensation, aquisition of apicobasal polarity and the radial, rosette-like arrangement around a central cavity. These cells bear the cytological characteristics of both the absorptive epithelial cells and the mesenchymal cells at their apical (adluminal) and abluminal ends respectively. 相似文献
196.
197.
Doc. Dr. Ljiljana Kostović-Knežević Želimir Bradamante Anton Švajger 《Cell and tissue research》1981,218(1):149-160
Summary The structure of elastic cartilage in the external ear of the rat was investigated by transmission and scanning electron microscopy.The narrow subperichondrial, boundary zone contains predominantly ovoid cells rich in cell organelles: mitochondria, Golgi complex, granular endoplasmic reticulum and small (40–100 nm) vesicles. Scarce glycogen granules and bundles of 6–7 nm cytoplasmic filaments are also present. Deeper in the boundary zone, one or more cytoplasmic lipid droplets appear and cytofilaments become more abundant.Fully differentiated chondrocytes in the central zone of the cartilage plate resemble white adipose cells. They are globular and contain a single, large cytoplasmic lipid droplet. The cytoplasm is reduced to a thin peripheral rim; it contains a flattened nucleus, few cytoplasmic organelles and abundant, densely packed, cytoplasmic filaments.The intercellular matrix is very sparse. The pericellular ring consists of collagen fibrils about 20 nm in diameter and a proteoglycan cartilage matrix in the form of a stellate reticulum. The complex of these two structures appears in the scanning electron micrographs as a network of randomly oriented, ca 100 nm thick fibrils. Spaces between pericellular rings of matrix also contain thick elastic fibers or plates, apparently devoid of microfibrils. In scanning electron micrographs elastic fibers could be detected only in a few areas, in which they were not obscured by other constituents of the matrix. Immature forms of elastic fibers, oxytalan (pre-elastic) and elaunin fibers, were found in the perichondrial and boundary zones. 相似文献
198.
Ljiljana Radojević Nevena Djordjević Branka Tucić 《Plant Cell, Tissue and Organ Culture》1989,17(1):21-26
Uninuclear microspores in red horse chestnut anther cultures formed pollen embryos and plantlents in MS agar medium supplemented with varying 2,4-D concentrations (1.0, 1.5 or 2.0 mg l-1) and 1.0 mg l-1 Kin. The highest number of embryogenic anthers (38%) was obtained in MS medium containing 1.0 mg l-1 of each 2,4-D and Kin. The ability of pollen embryos to germinate was closely correlated with normal embryo morphology and was influenced by hormone content in the medium (MS+;1.0 mg l-1 IAA+1.0 mg l-1 GA3+0.1 mg l-1 Kin+400 mg l-1 glutamine). Pollen embryos and plantlets had the haploid chromosome number (x=n=40). Cytological examinations demonstrated pollen dimorphism of this Aesculus species.Abbreviations AC
activated charcoal
- 2,4-D
2,4-dichlorophenoxyacetic acid
- IAA
indole-3-acetic acid
- Kin
6-furfurylaminopurine
- GA3
gibberellic acid
- MS
Murashige and Skoog 相似文献
199.
Ljiljana Minwalla Yang Zhao James Cornelius George F. Babcock R. Randall Wickett I. Caroline Le Poole Raymond E. Boissy 《Pigment cell & melanoma research》2001,14(3):185-194
We propose that some of the critical molecules involved in the transfer of melanosomes from melanocytes to keratinocytes include plasma membrane lectins and their glycoconjugates. To investigate this mechanism, co‐cultures of human melanocytes and keratinocytes derived from neonatal foreskins were established. The process of melanosome transfer was assessed by two experimental procedures. The first involved labeling melanocyte cultures with the fluorochrome CFDA. Labeled melanocytes were subsequently co‐cultured with keratinocytes, and the transfer of fluorochrome assessed visually by confocal microscopy and quantitatively by flow cytometry. The second investigative approach involved co‐culturing melanocytes with keratinocytes, and processing the co‐cultures after 3 days for electron microscopy to quantitate the numbers of melanosomes in keratinocytes. Results from these experimental approaches indicate significant transfer of dye or melanosomes from melanocytes to keratinocytes that increased with time of co‐culturing. Using these model systems, we subsequently tested a battery of lectins and neoglycoproteins for their effect in melanosome transfer. Addition of these selected molecules to co‐cultures inhibited transfer of fluorochrome by approximately 15–44% as assessed by flow cytometry, and of melanosomes by 67–93% as assessed by electron microscopy. Therefore, our results suggest the roles of selected lectins and glycoproteins in melanosome transfer to keratinocytes in the skin. 相似文献
200.
Loss of flow induces leukocyte-mediated MMP/TIMP imbalance in dynamic in vitro blood-brain barrier model: role of pro-inflammatory cytokines 总被引:3,自引:0,他引:3
Krizanac-Bengez L Hossain M Fazio V Mayberg M Janigro D 《American journal of physiology. Cell physiology》2006,291(4):C740-C749
There is substantial evidence linking blood-brain barrier (BBB) failure during cerebral ischemia to matrix metalloproteinases (MMP). BBB function may be affected by loss of shear stress under normoxia/normoglycemia, as during cardiopulmonary bypass procedures. The present study used an in vitro flow-perfused BBB model to analyze the individual contributions of flow, cytokine levels, and circulating blood leukocytes on the release/activity of MMP-9, MMP-2, and their endogenous inhibitors, the tissue inhibitors of MMPs (TIMPs), TIMP-1, and TIMP-2. The presence of circulating blood leukocytes under normoxic/normoglycemic flow cessation/reperfusion significantly increased the luminal levels of MMP-9 and activity of MMP-2, accompanied by partial reduction of TIMP-1, complete reduction of TIMP-2 and increased BBB permeability. These changes were not observed during constant flow with circulating blood leukocytes, or after normoxic/normoglycemic or hypoxic/hypoglycemic flow cessation/reperfusion without circulating blood leukocytes. The addition of anti-IL-6 or anti-TNF- antibody in the lumen before reperfusion suppressed the levels of MMP-9 and activity of MMP-2, had no effect on TIMP-1, and completely restored TIMP-2 and BBB integrity. Injection of TIMP-2 in the lumen before reperfusion prevented the activation of MMP-2 and BBB permeability. These data indicate that blood leukocytes and loss of flow are major factors in the activation of MMP-2, and that cytokine-mediated differential regulation of TIMP-1 and TIMP-2 may contribute significantly to BBB failure. shear stress; inflammation; matrix metalloproteinases 相似文献