全文获取类型
收费全文 | 1097篇 |
免费 | 84篇 |
专业分类
林业 | 42篇 |
农学 | 22篇 |
基础科学 | 2篇 |
214篇 | |
综合类 | 63篇 |
农作物 | 159篇 |
水产渔业 | 66篇 |
畜牧兽医 | 525篇 |
园艺 | 18篇 |
植物保护 | 70篇 |
出版年
2023年 | 6篇 |
2022年 | 19篇 |
2021年 | 38篇 |
2020年 | 33篇 |
2019年 | 36篇 |
2018年 | 36篇 |
2017年 | 27篇 |
2016年 | 35篇 |
2015年 | 32篇 |
2014年 | 48篇 |
2013年 | 59篇 |
2012年 | 76篇 |
2011年 | 56篇 |
2010年 | 39篇 |
2009年 | 34篇 |
2008年 | 57篇 |
2007年 | 44篇 |
2006年 | 54篇 |
2005年 | 34篇 |
2004年 | 41篇 |
2003年 | 37篇 |
2002年 | 22篇 |
2001年 | 21篇 |
2000年 | 14篇 |
1999年 | 10篇 |
1994年 | 5篇 |
1992年 | 8篇 |
1991年 | 9篇 |
1990年 | 5篇 |
1989年 | 8篇 |
1988年 | 8篇 |
1987年 | 12篇 |
1986年 | 10篇 |
1985年 | 10篇 |
1983年 | 8篇 |
1980年 | 5篇 |
1979年 | 7篇 |
1975年 | 6篇 |
1972年 | 5篇 |
1970年 | 5篇 |
1966年 | 5篇 |
1955年 | 8篇 |
1954年 | 5篇 |
1948年 | 5篇 |
1946年 | 6篇 |
1945年 | 10篇 |
1944年 | 5篇 |
1943年 | 5篇 |
1942年 | 4篇 |
1932年 | 4篇 |
排序方式: 共有1181条查询结果,搜索用时 218 毫秒
21.
22.
23.
Alberto Falco Mikolaj Adamek Patricia Pereiro David Hoole Jos Antonio Encinar Beatriz Novoa Ricardo Mallavia 《Marine drugs》2022,20(6)
The high proliferation of microorganisms in aquatic environments has allowed their coevolution for billions of years with other living beings that also inhabit these niches. Among the different existing types of interaction, the eternal competition for supremacy between the susceptible species and their pathogens has selected, as part of the effector division of the immune system of the former ones, a vast and varied arsenal of efficient antimicrobial molecules, which is highly amplified by the broad biodiversity radiated, above any others, at the marine habitats. At present, the great recent scientific and technological advances already allow the massive discovery and exploitation of these defense compounds for therapeutic purposes against infectious diseases of our interest. Among them, antimicrobial peptides and antimicrobial metabolites stand out because of the wide dimensions of their structural diversities, mechanisms of action, and target pathogen ranges. This revision work contextualizes the research in this field and serves as a presentation and scope identification of the Special Issue from Marine Drugs journal “The Immune System of Marine Organisms as Source for Drugs against Infectious Diseases”. 相似文献
24.
Analgesic efficacy of an oral transmucosal spray formulation of meloxicam alone or in combination with tramadol in cats with naturally occurring osteoarthritis
下载免费PDF全文
![点击此处可从《Veterinary anaesthesia and analgesia》网站下载免费的PDF全文](/ch/ext_images/free.gif)
25.
26.
Ana Carina Heil da Silva Matos Angélica Consalter Bárbara Paula dos Santos Batista Ana Beatriz Monteiro Fonseca Ana Maria Reis Ferreira Juliana da Silva Leite 《Reproduction in domestic animals》2021,56(4):667-672
Granulosa cell tumour, an ovarian neoplasm of stromal origin, is an important tumour related to oestrogenic dominance syndrome and cystic endometrial hyperplasia–pyometra complex. In order to analyse ovarian tumour´s malignant potential, immunohistochemical markers can be used, such as anti-HER2 and anti-Ki-67. The aim of this study was to evaluate the expression of immunohistochemical markers HER-2 and Ki-67 in granulosa cell tumour from bitches´ ovaries. In HER-2 immunomarker analysis using the HercepTest® method, most tumours were classified as 2+ (moderate labelling). Concerning Ki-67 immunomarker, only one case was described as having a high proliferative index. An association was found between immunostained cell percentage by anti-HER-2 antibodies and high pleomorphism, represented by the pattern of follicular/trabecular tumour arrangement. There was no correlation between anti-Ki-67 and anti-HER-2 antibody immunostaining intensities, probably due to only one case with a high Ki-67 index. With an effective protocol for HER-2 and Ki-67 immunohistochemical identification in granulosa cell tumours in bitches, it was possible to characterize this neoplasm proliferation profile. 相似文献
27.
Myrian Megumy Tsunokawa Hidalgo Ana Beatriz Marques de Almeida Fábio Lucas Zito de Moraes Rodrigo Yudi Palhaci Marubayashi Fabiana Ferreira de Souza Thales Ricardo Rigo Barreiros Maria Isabel Mello Martins 《Reproduction in domestic animals》2021,56(8):1117-1127
This study aimed to study the characteristics and subpopulations of spermatozoa from bulls with low and high reproductive performance based on pregnancy rates. Based on historical records of pregnancy rate from four farms, 24 bulls were selected. Two groups were established, with low pregnancy rates (n = 12; LOW), including bulls that presented pregnancy rates <52.27% (33.33% to 51.81%); and a group with high pregnancy rates (n = 12; HIGH), with pregnancy rates >52.27% (52.27% to 69.64%), after fixed-time artificial insemination (FTAI). The thawed sperm straws were analysed to sperm kinetics, morphology, plasma membrane integrity and sperm subpopulations. The LOW group exhibited a higher proportion of static cells (p < .05). In contrast, the HIGH group showed greater percentages for membrane integrity and total and progressive motility, and cells with fast and medium velocity (p < .05). In the cluster procedures, four sperm subpopulations were established. The low-fertility bulls presented the highest percentage of subpopulation 2 (41.46%), characterized by slow and progressive spermatozoa. The high-fertility bulls exhibited the highest percentage of subpopulation 3 (37.17%), characterized by fast and nonlinear spermatozoa. Results from this study indicated that bulls with greater percentages of fast and nonlinear spermatozoa seem to have greater fertilization capacity and the subpopulations analysis can be considered a tool to identify ejaculates with high fertility. 相似文献
28.
Kara L. Moreno Elizabeth M. Scallan Beatriz P. Monteiro Paulo V. Steagall Bradley T. Simon 《Veterinary anaesthesia and analgesia》2021,48(4):570-576
ObjectiveTo evaluate the thermal antinociceptive effects of a high-concentration formulation of buprenorphine alone or followed by hydromorphone in conscious cats.Study designRandomized, blinded, placebo-controlled crossover study design.AnimalsA total of six purpose-bred, adult female ovariohysterectomized Domestic Short Hair cats.MethodsCats were allocated into three treatments each consisting of two injections, subcutaneous then intravenous (IV) administration, 2 hours apart: treatment SS, two injections of 0.9% saline; treatment BS, buprenorphine (0.24 mg kg–1, 1.8 mg mL–1) and saline; and treatment BH, buprenorphine (0.24 mg kg–1) and hydromorphone (0.1 mg kg–1). Skin temperature (ST) and thermal threshold (TT) were recorded before (baseline) and for 24 hours following first injection. TT data were analyzed using mixed linear models and a Benjamini–Hochberg sequential adjustment procedure (p < 0.05).ResultsThere were no significant differences among treatments for baseline ST and TT values, treatment SS over time and between treatments BS and BH. Compared with baseline, TT was significantly increased at all time points in treatments BH and BS except at 2 hours in treatment BS. TT was significantly higher than SS at 3–18 hours and 4–12 hours for treatments BS and BH, respectively. Maximal increases in TT were 47.5 °C at 2 hours, 53.9 °C at 3 hours and 52.4 °C at 6 hours in treatments SS, BS and BH, respectively.Conclusions and clinical relevanceAdministration of IV hydromorphone following high-concentration buprenorphine provided no additional antinociception and decreased the duration of effect when compared with high-concentration buprenorphine alone. Alternative analgesics should be considered if additional analgesia is required after administration of high-concentration buprenorphine. 相似文献
29.
Detection of bacterial contamination and DNA quantification in stored blood units in 2 veterinary hospital blood banks
下载免费PDF全文
![点击此处可从《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Valentina Stefanetti Arianna Miglio Katia Cappelli Stefano Capomaccio Elisa Sgariglia Maria L. Marenzoni Maria T. Antognoni Mauro Coletti Vittorio Mangili Fabrizio Passamonti 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2016,45(3):406-410
Blood transfusions in veterinary medicine have become increasingly more common and are now an integral part of lifesaving and advanced treatment in small and large animals. Important risks associated with transfusion of blood products include the transmission of various infectious diseases. Several guidelines suggest what infectious agents to screen for in canine and feline transfusion medicine. However, while the risk of bacterial contamination of blood products during storage and administration has not been documented in veterinary medicine, it has emerged as a cause of morbidity and mortality in human transfusion medicine. Clinical experience shows that the majority of blood component bacterial contaminations are caused by only a few species. Unlike other types of bacteria, psychrotolerant species like Pseudomonas spp. and Serratia spp. can proliferate during the storage of blood units at 4°C from a very low titer at the time of blood collection to a clinically significant level (> 105 CFU/mL) causing clinical sepsis resulting from red blood cell concentrate transfusions in human medicine. The purpose of this report was to describe the detection and quantification procedures applied in 4 cases of bacterial contamination of canine and feline blood units, which suggest the need for further investigations to optimize patients’ safety in veterinary transfusion medicine. 相似文献
30.
Intorre L Meucci V Di Bello D Monni G Soldani G Pretti C 《Journal of the American Veterinary Medical Association》2007,231(4):590-595
OBJECTIVE: To determine tolerance of goldfish and zebrafish to benzalkonium chloride, formalin, malachite green, and potassium permanganate. DESIGN: Tolerance study. ANIMALS: Adult goldfish (Carassius auratus) and zebrafish (Danio rerio). PROCEDURES: Groups of fish (n = 10/group) were exposed to each disinfectant at the therapeutic dosage; at 0.25, 0.5, 3, and 5 times the concentration used for the therapeutic dosage; and at the concentration used for the therapeutic dosage but for 3 or 5 times the recommended exposure time. RESULTS: In both species, exposure to malachite green at the therapeutic dosage resulted in toxic effects, including death. Exposure to formalin at the therapeutic dosage resulted in toxic effects in goldfish, but not zebrafish, and exposure to potassium permanganate resulted in toxic effects in zebrafish, but not goldfish. On the basis of the ratio of therapeutic dosage to median lethal dosage, in goldfish, formalin was more toxic than benzalkonium chloride, which was more toxic than malachite green, which was more toxic than potassium permanganate. In zebrafish, potassium permanganate was more toxic than formalin and benzalkonium chloride, which were approximately equally toxic and more toxic than malachite green. Extending treatment time increased the toxicity of potassium permanganate in zebrafish and the toxicity of formalin and malachite green in goldfish, but did not alter the toxicity of the other disinfectants. CONCLUSIONS AND CLINICAL RELEVANCE: Results indicated that there was no consistency between zebrafish and goldfish in their tolerance to disinfectants, and that therapeutic dosages reported in the literature for these disinfectants were not always safe. 相似文献