全文获取类型
收费全文 | 372篇 |
免费 | 9篇 |
专业分类
林业 | 27篇 |
农学 | 2篇 |
31篇 | |
综合类 | 74篇 |
农作物 | 4篇 |
水产渔业 | 10篇 |
畜牧兽医 | 218篇 |
园艺 | 3篇 |
植物保护 | 12篇 |
出版年
2021年 | 3篇 |
2018年 | 7篇 |
2017年 | 5篇 |
2015年 | 2篇 |
2014年 | 8篇 |
2013年 | 8篇 |
2012年 | 15篇 |
2011年 | 15篇 |
2010年 | 4篇 |
2009年 | 7篇 |
2008年 | 14篇 |
2007年 | 10篇 |
2006年 | 12篇 |
2005年 | 21篇 |
2004年 | 25篇 |
2003年 | 15篇 |
2002年 | 15篇 |
2001年 | 17篇 |
2000年 | 14篇 |
1999年 | 8篇 |
1997年 | 3篇 |
1996年 | 5篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 6篇 |
1991年 | 4篇 |
1990年 | 7篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 7篇 |
1986年 | 15篇 |
1985年 | 9篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1979年 | 6篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1972年 | 3篇 |
1971年 | 3篇 |
1970年 | 2篇 |
1969年 | 8篇 |
1968年 | 6篇 |
1966年 | 3篇 |
1963年 | 3篇 |
1948年 | 2篇 |
1934年 | 2篇 |
排序方式: 共有381条查询结果,搜索用时 15 毫秒
81.
Catherine E. Doyle-Capitman Daniel J. Decker Cynthia A. Jacobson 《Human Dimensions of Wildlife》2018,23(4):375-390
The conservation community is increasingly taking a landscape-level approach to wildlife conservation. This approach faces obstacles, including how to ensure transboundary wildlife conservation goals that can be realized through local management actions, and how and when to engage local stakeholders in landscape conservation planning processes. Currently, local stakeholder participation is not institutionalized within these processes. This paper examines the potential role of local stakeholders in landscape conservation. In this paper, we present a preliminary model of cross-level coordination that could facilitate development and implementation of conservation across social–ecological landscapes, highlighting the possible contributions of local stakeholders. The feasibility of this model is contingent on addressing a range of challenges associated with local stakeholder participation in extra-local conservation decisions. Ultimately, we present suggestions for future research examining the potential for a locally inclusive, participatory approach to wildlife conservation across complex landscapes. 相似文献
82.
E R Jacobson J A Popp R P Shields J M Gaskin 《Journal of the American Veterinary Medical Association》1979,175(9):937-940
Three juvenile captive spectacled caimans (Caiman sclerops) had scattered, gray-white, circular, 1- to 3-mm skin lesions. In one caiman, the lesions were particularly prominent on the phalanges, palpebrae, and integument overlying the maxillae and mandible. Digital biopsy revealed large eosinophilic intracytoplasmic inclusions within epithelial cells. Transmission electron microscopy of lesions from the lower jaw revealed viral particles morphologically similar to poxvirus. 相似文献
83.
Elliott R. Jacobson Kristin H. Berry Dennis E. Brooks John F. Roberts 《Veterinary ophthalmology》2023,26(4):361-366
A wild Agassiz's desert tortoise, Gopherus agassizii, with bilateral eyelid reduction and plaques of tissue covering the superior surface of both corneas was examined in the field and subsequently submitted to the University of Florida for diagnostics. Polymerase chain reaction (PCR), from a swab of both corneas, was positive for Mycoplasma agassizii. Two months later, the tortoise was euthanatized and necropsied. There was increased bulbar exposure associated with dermal excoriation of periocular scales in both superior and inferior palpebra resulting in an increased palpebral fissure opening. Concurrently, there was bilateral conjunctivitis of the nictitating membranes and squamous metaplasia of the bulbar conjunctiva. Using PCR, Mycoplasma testudineum, another pathogen of tortoises, was identified in both nasal cavities, and the upper respiratory tract histopathological findings were consistent with those described for M. testudineum in Agassiz's desert tortoises. Although eye disease has been reported in desert and gopher (Gopherus polyphemus) tortoises with mycoplasmosis, widespread loss of palpebral tissue, conjunctivitis of the nictitans, and squamous metaplasia of the bulbar conjunctiva have not been reported in tortoises. 相似文献
84.
Michael G. Jacobson 《Small-Scale Forestry》2002,1(1):71-92
In the south-east United States, 70% of the forest area is privately owned, by an estimated 5 M landholders. If ecosystem
or landscape-level management is to work, cooperation across private ownerships is essential. As a first step in garnering
cooperation among landowners, a mail survey was carried out to understand their characteristics, attitudes, beliefs and interest
in ecosystem management. A specific area of the Coastal Plain of South Carolina, typical of rural forest-dominated areas of
this region, was chosen as the study site. Forestry-related uses, specifically timber production, are the main reasons why
over half the respondents own their land. Only one-third of the respondents are familiar with the concept of ecosystem management.
However, about 70% are interested in learning more about joint management with other landowners. The major concerns about
participating in joint management are loss of land and timber values. Most of the landowners who would participate in a landscape
corridor system, for example, want to maintain control of their land rights and limit outside intervention in the process. 相似文献
85.
Garner MM Gardiner CH Wellehan JF Johnson AJ McNamara T Linn M Terrell SP Childress A Jacobson ER 《Veterinary pathology》2006,43(3):311-320
Chelonian intranuclear coccidiosis has been reported once, in two radiated tortoises (Geochelone radiata), and is apparently rare. We describe intranuclear coccidiosis diagnosed histologically in two radiated tortoises, three Travancore tortoises (Indotestudo forstenii), two leopard tortoises (Geochelone pardalis), one bowsprit tortoise (Chersina angulata), and one impressed tortoise (Manouria impressa). Infection was systemic and involved alimentary, urogenital, respiratory, lymphoid, endocrine, and integumentary systems. Trophozoites, meronts, merozoites, macrogametocytes, microgametocytes, and nonsporulated oocysts were seen histologically or by electron microscopy. Intracytoplasmic and extracellular stages of parasite development also were identified histologically. Sequencing of a coccidial 18S rRNA consensus polymerase chain reaction (PCR) product revealed a novel sequence that provided phylogenetic information and may be useful for further diagnostic test design. Intranuclear coccidiosis was associated with variable degrees of inflammation in all cases, was considered the cause of death in six tortoises, and was a substantial contributing factor to the cause of death in two tortoises. 相似文献
86.
87.
Sweeny JP Ryan UM Robertson ID Jacobson C 《Veterinary journal (London, England : 1997)》2012,192(3):503-510
Diarrhoea is a widespread problem for sheep enterprises worldwide. A cross-sectional epidemiological study was conducted using a questionnaire to determine the prevalence of diarrhoea and associated risk factors where there was evidence of recent diarrhoea (active diarrhoea or fresh faecal soiling of breech fleece) for meat lambs on farms in southern Western Australia during 2010. The response rate was 41.4% (139/336). Evidence of recent diarrhoea was reported on 64.8% of farms, with a mean of 6.9% lambs affected per farm. Location of a farm and a higher annual rainfall were associated with an increased diarrhoea prevalence. Binary logistic regression analysis suggested that the drinking water source was associated with the incidence of diarrhoea, since lamb flocks supplied with dam water were 117 times (95% CI: 18.2, 754.8) more likely to have observed diarrhoea or fresh breech fleece faecal soiling than lamb flocks supplied with other sources of water. Faecal worm egg counts were used by 65% of respondents to determine whether an anthelmintic treatment was warranted and 74% of respondents administered a treatment to their meat lambs. In response to a range of diarrhoea scenarios presented to respondents (5%, 25% and 50% of the flock with evidence of recent diarrhoea), 15.1% would have elected to administer an anthelmintic treatment regardless of differences in prevalence. 相似文献
88.
Cuthbertson AG Mathers JJ Croft P Nattriss N Blackburn LF Luo W Northing P Murai T Jacobson RJ Walters KF 《Pest management science》2012,68(9):1289-1295
BACKGROUND: Predatory mites (Amblyseius swirskii Athias‐Henriot, Typhlodromips montdorensis Schicha, Neoseiulus cucumeris (Oudemans) and Iphiseius degenerans Berlese) were investigated for their potential to act as control agents for Thrips palmi Karny. Prey consumption rates and compatibility with pesticides were assessed. RESULTS: Second‐instar larvae were the preferred life stage. Typhlodromips montdorensis consumed the most larvae (2.8) and also an average of 1.2 adult T. palmi per 5 day period. Both 24 and 48 h assessments following application of abamectin, spinosad and imazalil demonstrated mortality of predatory mites (across all species), which was significantly higher than with the other treatments (P < 0.001). Spraying with pymetrozine did not provide any increased mortality when compared with the water control. Application of thiacloprid proved detrimental only to I. degenerans. Following indirect exposure of predatory mites to pymetrozine and imazalil, no significant differences in mite mortality were obtained. Indirect exposure to spinosad was identified as the most detrimental treatment (P < 0.001) to all mites. Abamectin also proved detrimental, with only T. montdorensis showing any potential tolerance. CONCLUSION: All predatory mites investigated offer potential for controlling T. palmi. Compatibility with chemicals varied between the mites. The potential of incorporating the mites into eradication strategies for T. palmi is discussed. Copyright © 2012 Society of Chemical Industry 相似文献
89.
Eradication programmes directed against Sarcoptes scabiei var. suis, performed without any disinfection of the environment, were compared to an eradication programme including a simultaneous environmental disinfection. The performance of such programmes would be facilitated considerably if environmental disinfection could be avoided. The trial was conducted in four conventional piglet-producing herds designated A-D. All herds suffered from a subclinical but persistent infection with the sarcoptic mite. Herd A was treated with two injections of ivermectin and simultaneously disinfection of the environment was done. In the other herds, the animals were treated twice (B and C) or three times (D) with acaricides (ivermectin or phoxim) at intervals of 7-12 days without any simultaneous disinfection of the buildings or environment. The results were monitored by attempts to demonstrate the mite by skin scrapings, and by monitoring the levels of serum antibodies to Sarcoptes scabiei by an ELISA. Samples were taken from all adults and from 20% of the piglets aged 10-12 weeks, before initiating the control programmes, every third month during the first year and a final sampling 18 months after the treatments. After treatment, the levels of antibodies continuously decreased. Presumably dead S. scabiei were demonstrated in one sow from two of the herds 3 months after initiating acaricidal treatments. S. scabiei was not demonstrated later, nor from skin scrapings of the piglets. The results obtained demonstrate that it is possible to eradicate sarcoptic mange mites in swine herds with the use of simplified eradication programmes. The success of such programmes may efficiently be monitored by measuring the levels of serum antibodies to S. scabiei. 相似文献
90.
Nollens HH Hernandez JA Jacobson ER Haulena M Gulland FM 《Journal of the American Veterinary Medical Association》2005,227(3):467-473
OBJECTIVE: To identify risk factors that may predispose California sea lions (Zalophus californianus) to development of cutaneous poxvirus nodules during hospitalization in a rehabilitation center. DESIGN: Retrospective case-control study. ANIMALS: 90 California sea lions admitted to a rehabilitation center. PROCEDURE: Hospital records of 275 stranded California sea lions admitted to the rehabilitation center between January 1 and December 31, 2002, were reviewed. All California sea lions (n = 18) that developed > or = 1 cutaneous poxvirus nodule during hospitalization were classified as cases. Seventy-two California sea lions that did not develop poxvirus lesions during hospitalization were randomly selected (control group). The frequencies of various exposure factors prior to admission, at admission, and during hospitalization for cases and control sea lions were compared by use of logistic regression. RESULTS: California sea lions that had previously been admitted to the rehabilitation center were 43 times as likely to develop poxvirus lesions as sea lions admitted for the first time; those with high band neutrophil counts (> 0.69 X 10(3) bands/microL) at admission were 20 times less likely to develop poxvirus lesions than sea lions with counts within reference limits. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that sea lions with a history of prior hospitalization or band neutrophil counts within reference limits at admission were more likely to develop poxvirus lesions during hospitalization. Sea lions with histories of hospitalization should be kept in quarantine and infection control measures implemented to help prevent disease transmission to attending personnel and other hospitalized animals. 相似文献