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81.
Palanisamy GS Cheon YP Kim J Kannan A Li Q Sato M Mantena SR Sitruk-Ware RL Bagchi MK Bagchi IC 《Molecular endocrinology (Baltimore, Md.)》2006,20(11):2784-2795
The steroid hormone progesterone (P) plays a pivotal role during ovulation. Mice lacking P receptor (Pgr) gene fail to ovulate due to a defect in follicular rupture. The P receptor (PGR)-regulated pathways that modulate ovulation, however, remain poorly understood. To identify these pathways, we performed gene expression profiling using ovaries from mice subjected to gonadotropin-induced superovulation in the presence and in the absence of CDB-2914, a synthetic PGR antagonist. Prominent among the genes that were down-regulated in response to CDB-2914 was endothelin (ET)-2, a potent vasoactive molecule. ET-2 mRNA was transiently induced in mural granulosa cells of the preovulatory follicles immediately preceding ovulation. This induction was absent in the ovaries of PGR null mice, indicating a critical role of this receptor in ET-2 expression. To investigate the functional role of ET-2 during ovulation, we employed selective antagonists of endothelin receptors, ETR-A and ETR-B. Mice treated with an ETR-B antagonist exhibited a dramatic (>85%) decline in the number of released oocytes. Strong expression of ETR-B was observed in the mural and cumulus granulosa cells of the preovulatory follicles as well as in the capillaries lining the inner border of the theca interna. We also identified cGMP-dependent protein kinase II, a previously reported PGR-regulated gene, as a downstream target of ET-2 during ovulation. Collectively, our studies uncovered a unique pathway in which ET-2, produced by PGR in mural granulosa cells, acts in a paracrine or autocrine manner on multiple cell types within the preovulatory follicle to control the final events leading to its rupture. 相似文献
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83.
Predictive pharmacophore models have been developed for a series of arylamino-substituted benzo[b]thiophenes exhibiting free
radical scavenging activity. 3D pharmacophore models were generated using a set of 20 training set compounds and subsequently
validated by mapping 6 test set compounds using Discovery Studio 2.1 software. Further model validation was performed by randomizing
the data using Fischer’s validation technique at the 95% confidence level. The most predictive pharmacophore model developed
using the conformers obtained from the BEST method showed a correlation coefficient (r) of 0.942 and consisted of three features: hydrogen bond donor, hydrogen bond acceptor and aromatic ring. Acceptable values
of external validation parameters, like Rpred2 R_{{\rm{pred}}}^2 (0.853) and rm( test )2 r_{m\left( {test} \right)}^2 (0.844), also implied that the external predictivity of the model was significant. The development of further pharmacophore
models using conformers obtained from the FAST method yielded a few models with good predictivity, with the best one (r = 0.904) consisting of two features: hydrogen bond donor and hydrogen bond acceptor. Significant values of external validation
parameters, Rpred2 R_{{\rm{pred}}}^2 (0.913) and rm( test )2 r_{m\left( {test} \right)}^2 (0.821), also reflect the high predictive ability of the model. Again, Fischer validation results implied that the models
developed were robust enough and their good results were not based on mere chance. These validation approaches indicate the
reliability of the predictive abilities of the 3D pharmacophore models developed here, which may thus be further utilized
as a 3D query tool in the virtual screening of new chemical entities with potent antioxidant activities. 相似文献
84.
Abhishek Kumar Prabhudutta Mamidi Indrani Das Tapas K. Nayak Sameer Kumar Jagamohan Chhatai Subhasis Chattopadhyay Amol R. Suryawanshi Soma Chattopadhyay 《PloS one》2014,9(1)
Background
The recent re-emergence of Chikungunya virus (CHIKV) in India after 32 years and its worldwide epidemics with unprecedented magnitude raised a great public health concern.Methods and Findings
In this study, a biological comparison was carried out between a novel 2006 Indian CHIKV outbreak strain, DRDE-06 and the prototype strain S-27 in mammalian cells in order to understand their differential infection pattern. Results showed that S-27 produced maximum number of progenies (2.43E+06 PFU/ml) at 20 to 24 hours post infection whereas DRDE-06 produced more than double number of progenies around 8 hours post infection in mammalian cells. Moreover, the observation of cytopathic effect, detection of viral proteins and viral proliferation assay confirmed the remarkably faster and significantly higher replication efficiency of DRDE-06. Moreover, our mutational analysis of whole genome of DRDE-06 revealed the presence of nineteen mutations as compared to S-27, whereas the analysis of 273 global isolates showed the consistent presence of fifteen out of nineteen mutations in almost all outbreak isolates. Further analysis revealed that ∼46% of recent outbreak strains including DRDE-06 do not contain the E1-A226V mutation which was earlier shown to be associated with the adaptation of CHIKV in a new vector species, Aedes albopictus.Conclusions
A novel 2006 Indian CHIKV outbreak strain, DRDE-06 exhibits different pattern of infection as compared to prototype strain, S-27. This might be associated to some specific mutations observed in genome wide mutational analysis in DRDE-06 which emphasizes the need of future experimental investigation. 相似文献85.
Sowmithra Sowmithra Jain Nishtha Kusum Bhonde Ramesh Datta Indrani 《Cellular and molecular neurobiology》2022,42(4):1167-1188
Cellular and Molecular Neurobiology - Increasing evidence suggests that mesenchymal stem cells(MSCs) have beneficial effects in hypoxic ischemic reperfusion injury, but the underlying mechanisms... 相似文献
86.
A genomic approach to identify novel progesterone receptor regulated pathways in the uterus during implantation 总被引:19,自引:0,他引:19
Cheon YP Li Q Xu X DeMayo FJ Bagchi IC Bagchi MK 《Molecular endocrinology (Baltimore, Md.)》2002,16(12):2853-2871
The cellular actions of steroid hormone progesterone (P) are mediated via its nuclear receptors, which regulate the expression of specific target genes. The identity of gene networks that are regulated by the P receptors (PRs) in the uterus at various stages of the reproductive cycle and pregnancy, however, remain largely unknown. In this study, we have used oligonucleotide microarrays to identify mRNAs whose expression in the pregnant mouse uterus is modulated by RU486, a well-characterized PR antagonist, which is also an effective inhibitor of implantation. We found that, in response to RU486, expression of mRNAs corresponding to 78 known genes was down-regulated at least 2-fold in the preimplantation mouse uterus. The PR regulation of several of these genes was ascertained by administering P to ovariectomized wild-type and PR knockout (PRKO) mice. Detailed spatio-temporal analysis of these genes in the pregnant uterus indicated that their expression in the epithelium and stroma could be correlated with the expression of PR in those cell types. Furthermore, time-course studies suggested that many of these genes are likely primary targets of PR regulation. We also identified 70 known genes that were up-regulated at least 2-fold in the pregnant uterus in response to RU486. Interestingly, initial examination of a number of RU486-inducible genes reveals that their uterine expression is also regulated by estrogen. The identification of several novel PR-regulated gene pathways in the reproductive tract is an important step toward understanding how P regulates the physiological events leading to implantation. 相似文献
87.
88.
Jadhav Kapilesh Kushwaha Bijayendra Jadhav Indrani Shankar Prem Geethadevi Anjali Kumar Gaurav Mittal Sonam Sharma Guru Prasad Parashar Madhuri Parashar Deepak 《Molecular biology reports》2021,48(2):1045-1053
Molecular Biology Reports - Genome analysis of Halomonas shambharensis, a novel species, was performed to understand the osmoprotectant strategies used by the strain to overcome the salinity stress... 相似文献
89.
90.
Umesha KR Kumar S Parvathi A Duenngai K Sithithaworn P Karunasagar I Karunasagar I 《Experimental parasitology》2008,(4):353-356
A polymerase chain reaction (PCR) assay was evaluated for detection of Opisthorchis viverrini eggs in the stool specimens of light and heavily infected individuals in Khon Kaen province of Thailand. A total of 75 fecal specimens were analyzed by PCR following DNA extraction. All the microscopically positive samples were positive by PCR, while 23 of 30 (76.6%) microscopically negative samples were also PCR positive. The sensitivity of the assay was 5 eggs/g of stool. This method is potentially useful in the diagnosis of human opisthorchiasis in endemic areas for treatment and in epidemiological investigations. 相似文献