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71.
72.
Roussi S Gossé F Aoudé-Werner D Zhang X Marchioni E Geoffroy P Miesch M Raul F 《Apoptosis : an international journal on programmed cell death》2007,12(1):87-96
We reported previously that 7β-hydroxysitosterol and 7β-hydroxycholesterol induced apoptosis in Caco-2 cells. Apoptosis caused
by 7β-hydroxysitosterol but not by 7β-hydroxycholesterol was related to a caspase-dependent process. In the present report,
we compared the effects of both compounds on mitochondria integrity and on various modulators of apoptosis. When Caco-2 cells
were exposed to both hydroxysterols, no changes in Bcl-2 and Bax expressions were detected indicating a Bcl-2/Bax-independent
cell death pathway, whereas loss of mitochondrial membrane potential and cytochrome c release were observed. Endonuclease G expression and enhanced production of reactive oxygen species were detected in 7β-hydroxycholesterol
treated cells, but not with 7β-hydroxysitosterol. Loss of mitochondrial membrane potential and cell death produced by both
hydroxysterols were prevented by vitamin C. Lysosomal membrane integrity was altered with both hydroxysterols, but 7β-hydroxysitosterol
was significantly more active on than 7β-hydroxycholesterol. Both hydroxysterols induced apoptosis by mitochondrial membrane
permeabilization. However, 7β-hydroxycholesterol exhibited a specific enhancement of oxidative stress and of endonuclease
G expression despite its closely related chemical structure with 7β-hydroxysitosterol. The two hydroxysterols exhibit different
lipophilic properties which may explain their different biological effects. 相似文献
73.
Simon P. Fletcher Daniel J. Chin Lore Gruenbaum Hans Bitter Erik Rasmussen Palanikumar Ravindran David C. Swinney Fabian Birzele Roland Schmucki Stefan H. Lorenz Erhard Kopetzki Jade Carter Miriam Triyatni Linta M. Thampi Junming Yang Dalal AlDeghaither Marta G. Murredu Paul Cote Stephan Menne 《PLoS pathogens》2015,11(9)
74.
Joanna Burger Michael Gochfeld Nabeel Alikunhi Haitham Al-Jahdali Dalal Al-Jebreen Abdulaziz Al-Suwailem 《人类与生态风险评估》2015,21(3):799-827
Fish are a healthful source of protein, but contaminants in some fish pose a risk. While there are multiple risk assessments from Europe and North America, there are far fewer for other parts of the world. We examined the risks from mercury, arsenic, lead, and other metals in fish consumed by people in Jeddah area, Saudi Arabia, using site-specific data on consumption patterns and metal levels in fish. The U.S. Environmental Protection Agency's Hazard Quotient (HQ) and cumulative Hazard Index (HI) for non-cancer endpoints and Carcinogenic Index for cancer were used to determine the health risk based on fish consumption rates. Of the 13 fish species examined, HQ was greater than 1 (indicating elevated risk) in two species for arsenic, and seven species for methylmercury. The cumulative HI for all metals was above 1 for all but three species of fish at the mean consumption rates. Generally, fish species with HI above 1 for one sampling location, had HI above 1 for all sampling locations. The implications of these findings are discussed in the light of strategies for reducing risk from fish consumption while encouraging dietary intakes of fish with low mercury and arsenic levels. 相似文献
75.
76.
Bakshi SR Brahmbhatt MM Trivedi PJ Dalal EN Patel DM Purani SS Shukla SN Shah PM Patel PS 《Indian journal of human genetics》2012,18(1):106-108
Trisomy of chromosome 8 is frequently reported in myeloid lineage disorders and also detected in lymphoid neoplasms as well as solid tumors suggesting its role in neoplastic progression in general. It is likely to be a disease-modulating secondary event with underlying cryptic aberrations as it has been frequently reported in addition to known abnormalities contributing to clinical heterogeneity and modifying prognosis. Here, we share our findings of trisomy 8 in leukemia patients referred for diagnostic and prognostic cytogenetic assessment. Total 60 cases of trisomy 8, as a sole anomaly or in addition to other chromosomal aberrations, were reported (January 2005-September 2008). Unstimulated bone marrow or blood samples were cultured, followed by GTG banding and karyotyping as per the ISCN 2005. Patients with +8 were chronic myeloid leukemia (CML) (36), acute myeloid leukemia (AML) (17), and acute lymphoblastic leukemia (ALL) (7). In 7 patients, trisomy 8 was the sole anomaly, whereas in 6 patients +8 was in addition to normal clone, in 47 patients, the +8 was in addition to t(9;22), t(15;17), and others, including 3 with tetrasomy 8. Only one patient showed constitutional +8. The present study will form the basis of further cumulative studies to correlate potential differential effects of various karyotypic anomalies on disease progression and survival following a therapeutic regime. To unravel the role of extra 8 chromosome, constitutional chromosomal analysis and uniparental disomy will be considered. 相似文献
77.
Accumulation of misfolded proteins and alterations in calcium homeostasis induces endoplasmic reticulum (ER) stress, leading to apoptosis. In this study, we tested the hypothesis that β-AR stimulation induces ER stress, and induction of ER stress plays a pro-apoptotic role in cardiac myocytes. Using thapsigargin and brefeldin A, we demonstrate that ER stress induces apoptosis in adult rat ventricular myocytes (ARVMs). β-AR-stimulation (isoproterenol; 3h) significantly increased expression of ER stress proteins, such as GRP-78, Gadd-153, and Gadd-34, while activating caspase-12 in ARVMs. In most parts, these effects were mimicked by thapsigargin. β-AR stimulation for 15 min increased PERK and eIF-2α phosphorylation. PERK phosphorylation remained higher, while eIF-2α phosphorylation declined thereafter, reaching to ~50% below basal levels at 3 h after β-AR stimulation. This decline in eIF-2α phosphorylation was prevented by β1-AR, not by β2-AR antagonist. Forskolin, adenylyl cyclase activator, simulated the effects of ISO on eIF-2α phosphorylation. Salubrinal (SAL), an ER stress inhibitor, maintained eIF-2α phosphorylation and inhibited β-AR-stimulated apoptosis. Furthermore, inhibition of caspase-12 using z-ATAD inhibited β-AR-stimulated and thapsigargin-induced apoptosis. In vivo, β-AR stimulation induced ER stress in the mouse heart as evidenced by increased expression of GRP-78 and Gadd-153, activation of caspase-12, and dephosphorylation of eIF-2α. SAL maintained phosphorylation of eIF-2α, inhibited activation of caspase-12, and decreased β-AR-stimulated apoptosis in the heart. Thus, β-AR stimulation induces ER stress in cardiac myocytes and in the heart, and induction of ER stress plays a pro-apoptotic role. 相似文献
78.
Kearns MT Dalal S Horstmann SA Richens TR Tanaka T Doe JM Boe DM Voelkel NF Taraseviciene-Stewart L Janssen WJ Lee CG Elias JA Bratton D Tuder RM Henson PM Vandivier RW 《American journal of physiology. Lung cellular and molecular physiology》2012,302(7):L711-L718
Efficient clearance of apoptotic cells from the lung by alveolar macrophages is important for the maintenance of tissue structure and function. Lung tissue from humans with emphysema contains increased numbers of apoptotic cells and decreased levels of vascular endothelial growth factor (VEGF). Mice treated with VEGF receptor inhibitors have increased numbers of apoptotic cells and develop emphysema. We hypothesized that VEGF regulates apoptotic cell clearance by alveolar macrophages (AM) via its interaction with VEGF receptor 1 (VEGF R1). Our data show that the uptake of apoptotic cells by murine AMs and human monocyte-derived macrophages is inhibited by depletion of VEGF and that VEGF activates Rac1. Antibody blockade or pharmacological inhibition of VEGF R1 activity also decreased apoptotic cell uptake ex vivo. Conversely, overexpression of VEGF significantly enhanced apoptotic cell uptake by AMs in vivo. These results indicate that VEGF serves a positive regulatory role via its interaction with VEGF R1 to activate Rac1 and enhance AM apoptotic cell clearance. 相似文献
79.
Trivedi PJ Patel PS Brahmbhatt MM Patel BP Gajjar SB Dalal EN Shukla SN Shah PM Bakshi SR 《Indian journal of human genetics》2009,15(3):137-139
We report here two cases of trisomy 13 in acute myeloid leukemia M1 subtype. short-term unstimulated bone marrow and peripheral blood lymphocyte culture showed 47, XY, +13 in all metaphase plates and trisomy 13 was confirmed with whole chromosome paint probes. Trisomy 13 in AML-M1 is a rare numerical abnormality. This is the first Indian report of sole trisomy 13 in AML-M1. Here, we present two cases of elder male patients, which may constitute a distinct subtype. 相似文献
80.