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71.
Barbara Riond Marina L. Meli Ueli Braun Peter Deplazes Kaspar Joerger Rudolf Thoma Hans Lutz Regina Hofmann-Lehmann 《Comparative clinical pathology》2008,17(3):171-177
An outbreak of a fatal haemolytic anaemia in a dairy herd of cattle in Switzerland was shown to be associated with infections
with five vector-borne pathogens, namely Anaplasma marginale, A. phagocytophilum, Babesia bigemina, a Theileria spp belonging to the buffeli/sergenti/orientalis complex and haemotrophic Mycoplasma spp. The latter three had not been documented before this outbreak in Switzerland. To characterise the haematological and blood
chemical changes in these unique cows, packed cell volume was determined in all 286 blood samples, blood smears, and complete
haematology were performed from 285 and 173 blood samples, respectively, and biochemical parameters were assayed in 105 serum
samples. Regenerative anaemia was the key sign of illness. Red blood cells of anaemic cattle were hypochromic and macrocytic.
Anaemic animals had reduced platelet cell counts and increased total white cell counts. In addition, increased serum bilirubin,
blood aspartate aminotransferase, gamma glutamyltransferase, glutamic dehydrogenase and blood urea nitrogen and decreased
magnesium, calcium and albumin levels were found in anaemic cattle when compared to animals with normal packed cell volume.
Most changes could not be attributed to a single infection. A. marginale seemed to be important in causing the outbreak, but co-infections may have aggravated the disease development and clinical
signs. Thus, when encountering cattle with haemolytic anaemia, all of the mentioned pathogens should be included as differential
diagnosis. 相似文献
72.
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74.
Evidence that peaks in EMG averages can sometimes be caused by inhibition of motoneurons 总被引:5,自引:0,他引:5
1. It has been reported that an excitatory response occurs before strong inhibition in masticatory muscles. We tested the hypothesis that this small monopolar wave in the EMG, called by us the early exteroceptive component (EEC), is in fact the first response to inhibition. 2. A mapping of the electrical activity of the masseter muscle was performed using a 3 x 4 matrix of surface electrodes with reference to the back of the neck. Subjects sat with the jaw closing muscles relaxed or contracting at approximately 75% of the maximum voluntary level. The chin was tapped to evoke a jaw jerk reflex and the EEC was elicited by electrical stimulation to the palate. 3. In addition, bipolar EMGs and jaw position were recorded at minimal bite forces and at contraction levels of 5, 10, 15, or 20 N. 4. Data were computer average, with and without rectification, for 32 stimuli. 5. The EEC [latency 12.1 +/- 1.0 (SD)ms] was found to have the same polarity, shape, and duration as the repolarizing wave of the stretch reflex. 6. After electrical stimulation, an increase of bite force was never observed during or immediately after the EEC. Instead, bite force began to decrease 5-7 ms after the onset of the EEC. 7. The amplitude of the EECs never exceeded the level of the peaks in the preceding background EMG, even when the left and right palatal electrodes were stimulated simultaneously at high intensity.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
75.
A microiontophoretic study of the action of kainic acid and putative neurotransmitters in the rat mesencephalic trigeminal nucleus 总被引:1,自引:0,他引:1
The ‘excitotoxic’ hypothesis proposes that neurotoxic amino acids exert their effect through neuronal excitation (Olney, Ho &;Rhee, 1971).Colonnier, Steriade &;Landry (1979) have found that trigeminal mesencephalic neurons in the cat are resistant to the neurotoxic effect of kainic acid. In the present study it was found that the same neurons in the rat also resist the cytotoxic action of this amino acid. In addition, kainic acid, applied iontophoretically onto these neurons failed to alter their firing frequency. The resistance of these neurons to both neurotoxic and excitatory actions of kainic acid is consistent with the ‘excitotoxic’ hypothesis.Other putative neurotransmitters were applied by microiontophoresis on these neurons and none were found to alter their rate of discharge. Procaine however applied with relatively low ejecting currents consistently reduced their firing rates. The failure of the putative neurotransmitters tested to influence the rate of discharge of the trigeminal mesencephalic neurons suggests that the chemical synapses present on these neurons in the rat (Hinrichsen &;Larramendi, 1970) utilize another neurotransmitter from those tested. Alternatively the synapses might have a role other than the direct regulation of the firing frequency of these primary afferent neurons. 相似文献
76.
77.
T Albrecht D J Speelman V M Ramanujam H W Lund M S Legator N M Trieff 《Teratogenesis, carcinogenesis, and mutagenesis》1980,1(2):161-169
Inactivation of the infectivity of human cytomegalovirus (CMV) and herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2) has been observed following exposure to 4-nitroquinoline 1-oxide (NQO) or its metabolite, 4-hydroxyaminoquinoline 1-oxide (HAQO). The present study of the specificity of the chemical structure of 4-nitroquinolines demonstrated that both the 4-nitro and 1-oxide groups were required for inactivation of virus infectivity. Reduction of the 4-nitro group to a 4-hydroxyamino group enhanced activity, while further reduction to an amino group resulted in loss of activity against virus infectivity. The capacity to inactivate virus was also lost by substitution of the pyridine ring for the quinoline nucleus of NQO. The relationship between the chemical structure and the ability to inactivate viruses studied here correlates well with earlier in vivo carcinogenicity studies of the same group of chemicals. 相似文献
78.
Frequent transmission of enterococcal strains between mechanically ventilated patients treated at an intensive care unit 下载免费PDF全文
The objectives of this investigation were to study the respiratory tract colonization and transmission of enterococci between 20 patients treated with mechanical ventilation at an intensive care unit (ICU), to compare genotyping with phenotyping, and to determine the antibiotic susceptibilities of the isolated enterococci. Samples were collected from the oropharynx, stomach, subglottic space, and trachea within 24 h of intubation, every third day until day 18, and thereafter every fifth day until day 33. Enterococcal isolates (n = 170) were analyzed by pulsed-field gel electrophoresis and with the PhenePlate (PhP) system. The antimicrobial susceptibilities to five agents were determined. Seventeen of the 20 subjects were colonized with enterococci in the respiratory tract; 12 were colonized in the lower respiratory tract. Genotype analyses suggested that 13 patients were involved in a transmission event, including all patients intubated more than 12 days. In conclusion, colonization of resistant enterococci in the respiratory tract of intubated patients treated at an ICU was common. Transmission of enterococci between patients occurred frequently. Prolonged intubation period seems to be a risk factor for enterococcal cross-transmission. 相似文献
79.
Federspiel WJ Golob JF Merrill TL Lund LW Bultman JA Frankowski BJ Watach M Litwak K Hattler BG 《ASAIO journal (American Society for Artificial Internal Organs : 1992)》2000,46(3):261-267
Intravenous oxygenation represents a potential respiratory support modality for patients with acute respiratory failure or with acute exacerbations of chronic respiratory conditions. Our group has been developing an intravenous oxygenator, the IMO, which uses a constrained fiber bundle and a rapidly pulsating balloon within the fiber bundle. Balloon pulsation drives blood flow past the fibers at greater relative velocities than would otherwise exist within the host vessel, and gas exchange rates are enhanced. The purpose of this study was twofold: (1) to characterize the gas exchange performance of the current IMO in an extracorporeal mock vena cava vessel under conditions of known fixed vessel geometry and controlled blood flow rates; and (2) to compare the IMO gas exchange performance to that reported for the clinically tested IVOX device within a comparable ex vivo set-up. The ex vivo flow loop consisted of a 1 inch ID tube as a mock vena cava that was perfused directly from an anesthetized calf at blood flow rates ranging from 1 to 4 1/2 L/min. O2 and CO2 exchange rates were measured for balloon pulsation rates, which ranged from 0 to 180 bpm. Balloon pulsation significantly increased gas exchange, by 200-300% at the lowest blood flow rate and 50-100% at the highest blood flow rate. Balloon pulsation eliminated much if not all of the dependence of the gas exchange rate on blood flow rate as seen in passive oxygenators. This suggests that in clinical application the IMO may exhibit less gas transfer variability due to differences in cardiac output Over the entire flow rate range studied, the CO2 and O2 gas exchange rates of the IMO at maximal balloon pulsation varied from approximately 250 to 350 ml/min/m2. At maximum balloon pulsation the IMO exchanged CO2 and O2 at rates from 50-500% greater, depending upon the blood flow rate, than the exchange rates reported for the IVOX device in ex vivo tests. 相似文献
80.
Lund O 《Texas Heart Institute journal / from the Texas Heart Institute of St. Luke's Episcopal Hospital, Texas Children's Hospital》1987,14(2):144-153
During a 9-year period from January 1965 through December 1973, we performed isolated aortic valve replacement (AVR) for aortic stenosis (AS) or aortic regurgitation (AR) in 165 patients. All operations were done during total cardiac arrest using chemical cardioplegia according to the method of Bretschneider. The prostheses used were predominantly Starr-Edwards caged ball valves. One hundred thirty-nine patients were alive 30 days after operation. The 5-, 10-, and 15-year cumulative survival rates (+/- SE) were 78 +/- 4%, 62 +/- 4%, and 29 +/- 9%, respectively. In comparison to a sex- and age-matched control population, our patients had an excess mortality in the first postoperative year and again after the twelfth year. Patients who underwent AVR in 1972 and 1973 had better results than those who had operations in 1965 through 1971 (p < 0.05); the 1972-1973 patients had 5- and 10-year survival rates of 81 +/- 5% and 72 +/- 5%, respectively. The 1-year survival rate was 91% for patients with AS and 71% for those with AR (p < 0.05). In AS patients, long-term survival was adversely affected by a history of left ventricular failure, inclusion in NYHA functional class IV, cardiothoracic index of >/= 0.56, cardiac index of < 3.0 L/min/m(2), age > 55 years, previous myocardial infarction, systemic pulse pressure of = 40 mm Hg, mean left atrial pressure of >/= 15 mm Hg, and mean pulmonary artery pressure of >/= 24 mm Hg. In AR patients, an adverse prognosis was associated with left ventricular failure, syncope, age >/= 60 years, and NYHA class IV status. These results indicate that, in both AS and AR patients, operation should be performed early, before severely limiting symptoms and signs arise. 相似文献