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901.
Clive J. Petry Pura Rayco-Solon Anthony J. C. Fulford John D. H. Stead Dianne L. Wingate Ken K. Ong Giorgio Sirugo Andrew M. Prentice David B. Dunger 《Human genetics》2009,126(3):375-384
The insulin variable number of tandem repeats (INS VNTR) has been variably associated with size at birth in non-African populations. Small size at birth is a major determinant
of neonatal mortality, so the INS VNTR may influence survival. We tested the hypothesis, therefore, that genetic variation around the INS VNTR in a rural Gambian population, who experience seasonal variation in nutrition and subsequently birth weight, may be
associated with foetal and early growth. Six polymorphisms flanking the INS VNTR were genotyped in over 2,500 people. Significant associations were detected between the maternally inherited SNP 27
(rs689) allele and birth length [effect size 17.5 (5.2–29.8) mm; P = 0.004; n = 361]. Significant associations were also found between the maternally inherited African-specific SNP 28 (rs5506) allele
and post-natal weight gain [effect size 0.19 (0.05–0.32) z score points/year; P = 0.005; n = 728). These results suggest that in the Gambian population studied there are associations between polymorphic variation
in the genetically diverse INS gene and foetal and early growth characteristics, which contribute to overall polygenic associations with these traits. 相似文献
902.
Vargas AJ Bernardi ML Paranhos TF Gonçalves MA Bortolozzo FP Wentz I 《Animal reproduction science》2009,113(1-4):305-310
The objective of this study was to analyze reproductive performance in swine females re-serviced after return to estrus or abortion in comparison with females in first service (gilts or weaned females). Records used were obtained from four commercial sow herds in Brazil including 24,194 mating records from PigCHAMP research database. Three mating categories (first service in gilts or weaned sows, re-serviced after return to estrus and re-serviced after abortion) were considered for the analysis. The farrowing rate (FR) was less and return to estrus (RER), abortion rate (ABR) and total born (TB) were greater in the category re-serviced after return to estrus compared to first service category (P<0.05). The category re-serviced after abortion only differed from the first service category by a greater ABR (P<0.05). In gilts and PO2-5 females re-serviced after a return to estrus, the FR was less (72.0% and 83.2%) and RER was greater (22.3% and 12.5%) compared to first service PO2-5 sows (92.7% and 5.3%; P<0.05). A re-service after a return to estrus did not affect TB in PO > or =2 females (P>0.05) but resulted in less TB in gilts and greater TB in primiparous sows (P<0.05). In females re-serviced after a return to estrus the performance was similar (P>0.05) between the two intervals considered as regular return to estrus (18-24 days and 36-48 days). Among the intervals considered as irregular return to estrus, greater FR was observed in intermediate (25-35 days) than in early (11-17 days) or late (>48 days) intervals. The re-service after a return to estrus results in an impaired farrowing rate, with a greater impact on gilts than at older parities. Females re-serviced after abortion are more predisposed to the recurrence of this reproductive failure. 相似文献
903.
904.
Pierluigi Maestrini Andrea Cavallini Milena Rizzo Tommaso Giordani Rodolfo Bernardi Mauro Durante Lucia Natali 《Journal of plant physiology》2009,166(14):391
Poplar is an important crop and a model system to understand molecular processes of growth, development and responses to environmental stimuli in trees. In this study, we analyzed gene expression in white poplar (Populus alba) plants subjected to chilling. Two forward suppression-subtractive-hybridization libraries were constructed from P. alba plants exposed to low non-freezing temperature for 6 or 48 h. Hundred and sixty-two cDNAs, 54 from the 6-h library and 108 from the 48-h library, were obtained. Isolated genes belonged to six categories of genes, specifically those that: (i) encode stress and defense proteins; (ii) are involved in signal transduction; (iii) are related to regulation of gene expression; (iv) encode proteins involved in cell cycle and DNA processing; (v) encode proteins involved in metabolism and energetic processes; and (vi) are involved in protein fate.Different expression patterns at 3, 6, 12, 24, 48 h at 4 °C and after a recovery of 24 h at 20 °C were observed for isolated genes, as expected according to the class in which the gene putatively belongs. Forty-four of 162 genes contained DRE/LTRE cis-elements in the 5′ proximal promoter of their orthologs in Populus trichocarpa, suggesting that they putatively belong to the CBF regulon. The results contribute new data to the list of possible candidate genes involved in cold response in poplar. 相似文献
905.
Fiorella Fontana Pasquale Bernardi Carmine Pizzi Santi Spampinato Andrea Bedini Emilio Merlo Pich 《Peptides》2009,30(9):1705-1709
The aim of our study was to evaluate the effects of repeated episodes of angina and induced myocardial ischemia on plasma nociceptin/orphanin FQ (N/OFQ) levels. Patients with unstable angina (23 with new onset severe angina or accelerated angina and 18 with subacute angina at rest) who had had repeated spontaneous episodes of chest pain in the last week before the study underwent myocardial perfusion single-photon emission computed tomography using adenosine infusion. Twenty subjects without clinical symptoms of angina matched for age, sex and cardiac risk factors served as a control group. N/OFQ levels were significantly (P < 0.01) higher in the patients (15.2 ± 2.1 pg/ml) than in the control group (8.5 ± 2.6 pg/ml). Blood pressure and heart rate did not significantly differ. All patients showed transient adenosine infusion myocardial ischemia that did not induce chest pain or significantly modify plasma N/OFQ levels or hemodynamic parameters. Our findings show that unstable angina is associated with a significant increase in circulating N/OFQ levels unrelated to intervening transient myocardial ischemia or hemodynamic changes. This increase is probably related to the chest pain repeatedly occurring in the course of coronary artery disease, but absent during transient adenosine-induced myocardial ischemia. 相似文献
906.
Giovanna Del Vecchio Alessandro Giuliani Mercedes Fernandez Pietro Mesirca Ferdinando Bersani Rosanna Pinto Lucia Ardoino Giorgio A. Lovisolo Luciana Giardino Laura Calzà 《Bioelectromagnetics》2009,30(7):564-572
In this work we tested viability, proliferation, and vulnerability of neural cells, after continuous radiofrequency (RF) electromagnetic fields exposure (global system for mobile telecommunications (GSM) modulated 900 MHz signal at a specific absorption rate (SAR) of 1 W/kg and maximum duration 144 h) generated by transverse electromagnetic cells. We used two cellular systems, SN56 cholinergic for example, SN56 cholinergic cell line and rat primary cortical neurons, and well‐known neurotoxic challenges, such as glutamate, 25‐35AA beta‐amyloid, and hydrogen peroxide. Exposure to RF did not change viability/proliferation rate of the SN56 cholinergic cells or viability of cortical neurons. Co‐exposure to RF exacerbated neurotoxic effect of hydrogen peroxide in SN56, but not in primary cortical neurons, whereas no cooperative effects of RF with glutamate and 25‐35AA beta‐amyloid were found. These data suggest that only under particular circumstances exposure to GSM modulated, 900 MHz signal act as a co‐stressor for oxidative damage of neural cells. Bioelectromagnetics 30:564–572, 2009. © 2009 Wiley‐Liss, Inc. 相似文献
907.
908.
909.
Maurizio Bevilacqua Ligia J. Dominguez Giorgio Gandolini Valeria Valdes Tarcisio Vago Velella Righini Massimo Barrella Mario Barbagallo 《The Journal of steroid biochemistry and molecular biology》2009,113(1-2):3-8
Absorptive hypercalciuria (AH) is associated with elevated levels of 1,25-dihydroxyvitamin D (1,25(OH)2D). While no increase of 1,25(OH)2D after oral administration of 25-hydroxyvitamin D (25OHD) at high doses has been claimed in normal subjects, a substrate–product relationship has been reported in normal children, young people after UV irradiation, older persons, postmenopausal women, primary hyperparathyroidism, renal failure, osteomalacia, and sarcoidosis. No data of this relationship in AH is available. To investigate 25OHD-1,25(OH)2D substrate–product relationship in AH, 161 AH patients (mean age 60.9 ± 11.7 years) and 110 age- and sex-matched controls (mean age 61.5 ± 12.4 years) were studied. In 57 controls and 52 AH subjects 25OHD-1,25(OH)2D relationship in basal conditions and after 2-week oral 25OHD (25 μg/day) administration were evaluated. In basal conditions 25OHD and 1,25(OH)2D were correlated in both, controls and AH; 25OHD treatment was followed by an increase in serum 25OHD and 1,25(OH)2D in both groups. However, delta responses of 25OHD and 1,25(OH)2D to 25OHD were higher in AH suggesting an enhanced activity of 1α-hydroxylase. In conclusion, the higher response of 1,25(OH)2D after oral 25OHD in AH patients suggests a differential capacity between both groups in handling the increases in 1,25(OH)2D. 相似文献