全文获取类型
收费全文 | 243篇 |
免费 | 25篇 |
专业分类
耳鼻咽喉 | 1篇 |
妇产科学 | 21篇 |
基础医学 | 9篇 |
临床医学 | 1篇 |
内科学 | 4篇 |
神经病学 | 2篇 |
外科学 | 223篇 |
综合类 | 3篇 |
预防医学 | 4篇 |
出版年
2022年 | 2篇 |
2021年 | 5篇 |
2020年 | 4篇 |
2019年 | 7篇 |
2018年 | 2篇 |
2017年 | 8篇 |
2016年 | 6篇 |
2015年 | 3篇 |
2014年 | 6篇 |
2013年 | 43篇 |
2012年 | 10篇 |
2011年 | 4篇 |
2008年 | 1篇 |
2006年 | 41篇 |
2005年 | 35篇 |
2004年 | 30篇 |
2003年 | 18篇 |
2002年 | 13篇 |
2001年 | 12篇 |
2000年 | 11篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
排序方式: 共有268条查询结果,搜索用时 31 毫秒
1.
Lesley Murdin 《British Journal of Psychotherapy》2021,37(2):234-243
Many therapists have been using the telephone for analytic sessions during the Covid 19 pandemic. This paper considers the ways in which the use of the telephone resembles the use of the couch and revisits the value of the couch in order to assess the value of the telephone. The questions raised are whether analytic therapists still find the use of the couch helpful, and if so why. This is then linked to the experience of using only the telephone. The paper considers the ways in which the two techniques increase or diminish shame and the willingness to disclose difficult material. An anonymized clinical illustration is used of a woman who began in face-to-face work with a purely practical problem, but in telephone sessions was able to acknowledge her need to understand her own mental state in order to be able to change at a deeper level. Conclusions are drawn about the positive usefulness of the telephone in contrast with the view that it is just the best that we can do in some circumstances. 相似文献
2.
《The journal of maternal-fetal & neonatal medicine》2013,26(6):396-399
Objectives: To analyze the relationship between the leukemoid reaction and chronic lung disease in very-low-birth-weight (VLBW) infants. Methods: Neonates born weighing less than 1500 g without evidence of congenital anomalies and admitted to our hospital from October 1985 to December 1999 comprised our study. Leukemoid reaction was defined as a peripheral white blood cell (WBC) count of ≥ 50 × 103/μl. The infants who demonstrated a leukemoid reaction formed the study group, while the remainder formed the control group. The relationship between neonatal variables and WBC counts was studied. Results: Fourteen of the 486 infants demonstrated WBC counts of ≥ 50 × 103/μl, with an incidence of 2.9%. Univariate analysis demonstrated a significant association between a leukemoid reaction and chronic lung disease following intrauterine infection. Conclusion: A leukemoid reaction was observed in 2.9% of VLBW infants in our neonatal intensive care unit. A significant association was demonstrated between the leukemoid reaction and chronic lung disease following intrauterine infection. 相似文献
3.
Femoral Strength Changes Faster With Age Than BMD in Both Women and Men: A Biomechanical Study
下载免费PDF全文
![点击此处可从《Journal of bone and mineral research》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Although a large number of studies have addressed the age‐related changes in bone mineral density (BMD), there is a paucity of data for the assessment of femoral strength loss with age in both genders. We determined the variation of strength with age in femurs of women and men by mechanical tests on a cohort of 100 cadaveric femurs. In addition, the age‐related neck BMD loss in our cadaveric cohort was found to be similar with BMD loss of four published population‐based studies. Given the strong correlation found in our cadaveric study between BMD and femoral strength, we also estimated the femoral strength of the four populations based on their reported neck BMDs. Our study showed that men's femurs in our cadaveric cohort were stronger than women's femurs by about 800 N at the same BMD level, and by 1750 N at the same age. The strength differences were not explained satisfactorily by the size difference between men's and women's bones. Similar to the findings of clinical studies, the BMD values of men at all ages were larger than that of women. The age‐related loss rates in BMD and strength were not statistically different between the two genders of our cadaveric cohort. After normalization, strength decreased more than 40% faster than BMD. On average, men reached a certain BMD value about 16 years later than women, and for strength about 23 years later, which may explain the higher rate of hip fracture in postmenopausal women. In patient population cohorts men reached a similar BMD value about 16 to 25 years later than women, whereas for estimated strength, sometimes more than 40 years later. © 2015 American Society for Bone and Mineral Research. 相似文献
4.
5.
Sarah A Howles Mark H Edwards Cyrus Cooper Rajesh V Thakker 《Journal of bone and mineral research》2013,28(12):2535-2539
Kidney stones are common, with a multifactorial etiology involving dietary, environmental, and genetic factors. In addition, patients with nephrolithiasis are at greater risk of hypertension, diabetes mellitus, metabolic syndrome, and osteoporosis, although the basis for this is not fully understood. All of these renal stone–associated conditions have also been linked with adverse early‐life events, including low–birth weight, and it has been suggested that this developmental effect is due to excess exposure to maternal glucocorticoids in utero. This is proposed to result in long‐term increased hypothalamic‐pituitary‐axis activation; there are mechanisms through which this effect could also promote urinary lithogenic potential. We therefore hypothesize that the association between renal stone disease and hypertension, diabetes mellitus, metabolic syndrome, and osteoporosis may be related by a common pathway of programming in early life, which, if validated, would implicate the developmental origins hypothesis in the etiology of nephrolithiasis. © 2013 American Society for Bone and Mineral Research. 相似文献
6.
《Neurological research》2013,35(1):88-92
AbstractRecent advances in neuro-oncology have revealed different pathways of molecular oncogenesis in malignant gliomas including loss of heterozygosity on chromosomal regions harboring tumor suppressor genes. In the present study, we performed polymerase chain reaction–loss of heterozygosity (PCR-LOH) analysis using microsatellite markers to identify loss of heterozygosity on chromosomes 10q, 9p, 17p and 13q in the Malays with malignant gliomas. Of 12 cases with allelic losses, seven (58.3%) cases showed LOH on chromosome 10q, three (25.0%) cases showed LOH on chromosome 9p, four (33.3%) cases showed LOH on chromosome 17p and two (16.7%) cases showed LOH on chromosome 13q. The cases include five (41.7%) cases of glioblastoma multiforme, three (25.0%) cases of anaplastic astrocytoma, three (25.0%) cases of anaplastic oligodendroglioma and one (8.3%) case of anaplastic ependymoma. Four cases showed loss of heterozygosity on more than one locus. Our findings showed that loss of heterozygosity on specific chromosomal regions contributes to the molecular pathway of glioma progression in Malay population. In addition, these data provide useful evidence of molecular genetic alterations of malignant glioma in South East Asian patients, particularly in the East Coast of Malaysia. 相似文献
7.
Valencia-Flores M Orea A Herrera M Santiago V Rebollar V Castaño VA Oseguera J Pedroza J Sumano J Resendiz M García-Ramos G 《Obesity surgery》2004,14(6):755-762
Background: We evaluated the impact of surgically-induced weight loss on Obstructive Sleep Apnea/Hypopnea Syndrome (OSAHS),
electrocardiographic changes, pulmonary arterial pressure and daytime sleepiness in morbidly obese patients. Methods: 16 women
and 13 men (n=29) underwent bariatric surgery in a 3-year period. The following tests were performed before and 1 year after
surgery: nocturnal polysomnography, daytime Multiple Sleep Latency Test (MSLT), and echocardiogram. Results: Mean age was
37.9±11 years (range 20-56). Preoperative body mass index was 56.5±12.3 kg/m2 and it was 39.2±8.5 kg/m2 at 13.7±6.6 months follow-up. Performed surgical procedures included: vertical banded gastroplasty in 6, Roux-en-Y gastric
bypass in 12, and Distal Roux-en-Y gastric bypass in 11. Weight loss induced by surgery eliminated OSAHS in 46% of obese patients
with an important improvement in oxygen saturation. Neck, thorax, waist and hip circumferences decreased significantly after
surgical intervention but only neck circumference correlated significantly with the apnea/hypopnea index (Spearman rho=0.63, P <0.0001). Electrocardiographic abnormalities were present in 9 patients (31%) before surgery (sinus arrhythmia, ventricular
arrhythmias, and sinus arrest). The number of electrocardiographic abnormalities decreased after surgery but new abnormalities
appeared in some patients. Systolic pulmonary arterial pressure significantly decreased in the group of patients in whom OSAHS
disappeared after surgery. Daytime sleepiness persisted after surgery in most patients. Conclusion: Bariatric surgery effectively
reduces respiratory disturbances during sleep and improves pulmonary hypertension. Electro cardiographic abnormalities change
after surgery. Daytime sleepiness appeared not to be related to respiratory disturbances during sleep. 相似文献
8.
Abu Abeid S Szold A Gavert N Goldiner I Grynberg E Peretz H Konikoff FM 《Obesity surgery》2002,12(3):354-357
Background: Obesity and especially rapid weight loss following bariatric surgery are known risk factors for cholelithiasis.
Since the risk may be high, prophylactic cholecystectomy has been advocated. Apolipoprotein (Apo) E, an important carrier
protein in cholesterol metabolism and trafficking, is believed to play a role in gallstone pathogenesis. In particular, the
Apo E4 allele has been suggested to be associated with cholesterol cholelithiasis. The aim of this study was to assess the
incidence of postoperative cholelithiasis in our patient population and to determine a possible correlation with the Apo-E
genotype. Methods: 134 morbidly obese patients undergoing gastric restrictive surgery [laparoscopic assisted gastric banding
(LAGB) or silastic ring vertical gastroplasty (SRVG)] had abdominal ultrasound before and 6 to 12 months after operation,
to determine the presence of gallstones. None of the patients enrolled in the study had gallstones before surgery.They did
not have a prophylactic cholecystectomy or receive bile salt treatment. Apo-E genotypes were determined by Polymerase Chain
Reaction restriction enzyme analysis. Results: 10 patients (7.5%) developed postoperative cholelithiasis. The incidence of
cholelithiasis in each ApoE genotype was: E2/E3 - 1/20 (5%), E3/E3 - 3/91 (3%), E3/E4 - 6/21 (29%), and E4/E4 - 0/2. ApoE
allele frequencies in the study population were identical to those of a healthy control population. The mean BMI dropped from
43.6 to 29.4 kg/m2. Conclusions: The occurrence of postoperative gallstones was low in our population. However, in subjects with the Apo-E3/E4
genotype, the incidence is of practical significance. These data suggest that Apo-E genotyping may be useful in selecting
patients for gallstone prevention (surgical or medical) when undergoing bariatric surgery.Further testing in larger patient
populations may be able to give more definite guidelines in the future. 相似文献
9.
Background:This study illustrates our experience in laparoscopic Roux-en-Y gastric bypass (LRYGBP) using a new technique for
creating the gastrojejunostomy. Methods: Between April and November 1999, 28 patients underwent LRYGBP. In the first 10 patients
the transoral route with endoscopic guidance was utilized for placement of the anvil in the gastric pouch. A new totally intra-peritoneal
approach was utilized in the next 18 patients, avoiding the transoral route. Results:There were 23 women and 5 men with an
average age of 36 years (range 24-51). The mean BMI was 47, with range 41-64. Of the patients, 82% had one or more associated
co-morbid conditions (hypertension, diabetes, sleep apnea, arthritis). Average operative time in the first 10 patients using
the trans-oral route with endoscopic guidance was 340 minutes (range 240-390 min). The next 18 patients underwent totally
intra-peritoneal anvil placement with a 240-minute average operating time (range 150-310 min). There were no open conversions
or mortalities.There were 4 complications, including 2 wound infections, one urinary tract infection, and one intra-abdominal
abscess. The two wound infections occurred in the first 10 patients that underwent trans-oral introduction of the anvil. Conclusions:
LRYGBP was a safe and feasible operation. We believe that our technique is easily reproducible, avoiding the trans-oral route
for introducing the anvil. This technique may also decrease operative time and possibly the incidence of wound infections,
although we are still in the learning curve and final conclusions cannot be made. 相似文献
10.
Hernandez-Estefania R Gonzalez-Lamuño D Garcia-Ribes M Garcia-Fuentes M Cagigas JC Ingelmo A Escalante C 《Obesity surgery》2000,10(2):160-166
Background: Vertical banded gastroplasty (VBG) has been found to result in significant reduction in body mass index (BMI)
during the first postoperative year.We investigated the impact of some intrinsic and extrinsic factors on long-term BMI evolution
in morbidly obese patients who underwent VBG, with the aim of establishing a long-term weight-loss prognosis. Methods: 67
consecutive morbidly obese patients who underwent VBG were followed for 2 years; of these, 34 were followed 3 more years,
for a total follow-up of 5 years. BMI was monitored and correlated with demographic (preoperative BMI, obese relatives, age
and gender) and lifestyle variables (physical activity, habitual dietary transgression and occupational status). Results:
Global BMI fell from 47.5 at the time of the intervention to 32.1 when patients were examined 12 months after surgery. From
the second year, an upward trend was observed, and at 5 years, mean BMI was above 35, considered in the high-risk range. Modifiable
variables affecting lifestyle have shown significantly favorable effects on BMI evolution. Among intrinsic variables, BMI
before surgery and obese parents also affect long-term evolution. Conclusion: Different variables should be considered in
order to establish a long-term weight-loss prognosis for each patient, thus making it possible to act more specifically on
modifiable variables. 相似文献