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排序方式: 共有97条查询结果,搜索用时 15 毫秒
61.
Orsolya Kutasi Leticia Moravszki Sara Sardi Zsofia Bohak Imre Biksi Ferenc Baska Otto Szenci 《Journal of Equine Veterinary Science》2014
An 8-year-old Hungarian warmblood gelding used for show jumping was evaluated because of poor performance and chronic weight loss. On admission, oral and gastroesophageal ulcerations and malabsorption were detected. Results of thoracic radiography, ultrasonography, bronchoalveolar lavage cytology, and positive polymerase chain reaction for equine herpesvirus 5 raised the possible diagnosis of equine multinodular pulmonary fibrosis. However, abdominal ultrasonography revealed inhomogeneous spleen with many different sized well-demarcated hypoechoic areas, which suggested further differential diagnoses such as tuberculosis, neoplasias, immune mediated diseases, systemic granulomatous disease (SGD), or toxicoses. The horse was euthanized at the owner's request because of the poor condition and possible grave prognosis. Histopathology findings were characteristic of SGD, which is a rare disorder of horses characterized by skin lesions, weight loss, and granulomatous inflammation of multiple organ systems. The lack of skin lesions in this case is an unusual finding. Systemic granulomatous disease is hypothesized to be induced by multiple conventional antigens that are not cleared from affected tissues. Equine herpesvirus 5 might have triggered the granulomatous reactions in this particular case. 相似文献
62.
The live attenuated bovine viral diarrhea virus components of a multi-valent vaccine confer protection against fetal infection 总被引:1,自引:0,他引:1
Kovács F Magyar T Rinehart C Elbers K Schlesinger K Ohnesorge WC 《Veterinary microbiology》2003,96(2):117-131
Fetal infection with bovine virus diarrhea virus (BVDV) causes severe economic loss and virus spread in cattle. This study investigated the ability of modified live BVDV I and II components of a commercially available modified live virus (MLV) vaccine (Breed-Back FP 10, Boehringer Ingelheim Vetmedica Inc.) to prevent fetal infection and abortion, and therefore the birth of persistently infected animals. Heifers immunized with vaccine 4-8 weeks before insemination showed no adverse effects. All vaccinated animals had seroconverted to BVDV 4 weeks after immunization. Pregnant heifers were divided into two vaccination and two control groups and challenged with type I or II BVDV on days 60-90 of gestation. Seroconversion, clinical signs, immunosuppression, viremia, mortality, abortion rate, and fetal infection were studied. Post-challenge, 6/11 (type I challenged) and 8/11 (type II challenged) vaccinated heifers were free from clinical signs of BVD. Post-challenge clinical signs noted in the vaccinated groups were mild to moderate, while all unvaccinated controls had clinical signs ranging from moderate to severe. Viremia was not detected post-challenge in any of the vaccinated heifers. However, 100% of the controls were BVDV viremic on at least 1 day post-challenge. One of 22 vaccinated heifers had transient leukopenia, whereas 2/8 and 6/7 unvaccinated heifers in control groups I and II, respectively, had transient leukopenia. Type II BVDV infection led to abortion or death in 86% of unvaccinated heifers. The corresponding vaccinated group showed no deaths or abortions. All control group fetuses were infected with BVDV. The test vaccine gave 91% (type I BVDV challenged) and 100% (type II BVDV challenged) protection from fetal infection. This vaccine is safe and effective against fetal infection, abortion (type II BVDV) and the birth of persistently infected animals. 相似文献
63.
Jan Holeksa Milan Saniga Jerzy Szwagrzyk Tomasz Dziedzic Stanisław Ferenc Maciej Wodka 《European Journal of Forest Research》2007,126(2):303-313
The structure of natural subalpine spruce forest in the Zadná Pol’ana massif of the Western Carpathians was analysed. We focused
on the variability of different aspects of stand structure, tree decay and regeneration processes in altitudinal gradient.
We used systematic sampling, covering an area of 2 km2, to detect even subtle changes in stand structure within one forest type over a range of less than 200 m in elevation. Mean
stand density was 290 trees (>7 cm DBH) per hectare, average basal area was 41 m2 ha−1, and the volume accumulation in living trees amounted to 500 m3/ha−1. Stand volume decreased by more than 50% between 1,260 and 1,434 m a.s.l. This means for an increase of altitude of 100 m
that stand volume decreased by nearly 200 m3. Neither stand density nor basal area was related to elevation. Maximum tree height was strongly correlated to elevation,
and it decreased on average by 6 m for each 100 m increment of altitude. No significant changes in the maximum spruce diameter
were recorded in relation to the elevation gradient. Spatial distribution of trees was biased toward regularity at lower altitudes.
Tree clustering increased with increasing altitude. The stock of coarse woody debris (CWD) decreased slightly along the altitudinal
gradient, but changes were not significant. Density of spruce saplings and their number growing on CWD significantly increased
across the elevation gradient. Despite the fact that the analysed forest tract was relatively large, highly variable in respect
to environmental factors, and that stand volume, spatial structure, and tree height displayed strong variability along the
elevation gradient, the diameter structure of stands and regeneration measures were uniform. Our results suggest that the
recruitment of new trees in the Zadná Pol’ana subalpine spruce forest is not temporally continuous even at a scale of several
square kilometres. 相似文献
64.
Ferenc Lakatos Wojciech Grodzki Qing-He Zhang Christian Stauffer 《Journal of Forest Research》2007,12(5):345-349
The distribution of the double spined spruce engraver beetle Ips duplicatus ranges from Scandinavia and northeastern Europe to northern Asia. In Europe, I. duplicatus usually is associated with I. typographus on Picea abies, and due to morphological similarities and similar gallery constructions the damage and significance of I. duplicatus are often not recognised and thus underestimated. I. duplicatus has been recently reported from the southern part of Poland, the Czech Republic, Slovakia, northern parts of Austria and
Germany; records are missing from many other central European countries (e.g., Hungary). The species became an important pest
in some parts of central Europe, and continuous outbreaks of this bark beetle have been reported in Inner Mongolia, China,
since the 1950s. The aim of this study was to compare I. duplicatus populations from Europe and Asia by genetic means using the analysis of the mitochondrial DNA. Individuals of I. duplicatus populations from China, Poland, the Czech Republic and Slovakia were collected, and 520 bp fragments of the cytochrome oxidase I (COI) gene were analysed. Four haplotypes were detected and a sequence divergence of 0.8% was found between the populations
from China and Europe. These differences associate with behavioural differences in the pheromone bouquet and behavioural response
of the two groups. Within Europe three haplotypes were found, but due to the small sample size no significant geographical
distribution was demonstrated. 相似文献
65.
Genomic instability in mice lacking histone H2AX 总被引:1,自引:0,他引:1
Celeste A Petersen S Romanienko PJ Fernandez-Capetillo O Chen HT Sedelnikova OA Reina-San-Martin B Coppola V Meffre E Difilippantonio MJ Redon C Pilch DR Olaru A Eckhaus M Camerini-Otero RD Tessarollo L Livak F Manova K Bonner WM Nussenzweig MC Nussenzweig A 《Science (New York, N.Y.)》2002,296(5569):922-927
Higher order chromatin structure presents a barrier to the recognition and repair of DNA damage. Double-strand breaks (DSBs) induce histone H2AX phosphorylation, which is associated with the recruitment of repair factors to damaged DNA. To help clarify the physiological role of H2AX, we targeted H2AX in mice. Although H2AX is not essential for irradiation-induced cell-cycle checkpoints, H2AX-/- mice were radiation sensitive, growth retarded, and immune deficient, and mutant males were infertile. These pleiotropic phenotypes were associated with chromosomal instability, repair defects, and impaired recruitment of Nbs1, 53bp1, and Brca1, but not Rad51, to irradiation-induced foci. Thus, H2AX is critical for facilitating the assembly of specific DNA-repair complexes on damaged DNA. 相似文献
66.
Under stress, many crystalline materials exhibit irreversible plastic deformation caused by the motion of lattice dislocations. In plastically deformed microcrystals, internal dislocation avalanches lead to jumps in the stress-strain curves (strain bursts), whereas in macroscopic samples plasticity appears as a smooth process. By combining three-dimensional simulations of the dynamics of interacting dislocations with statistical analysis of the corresponding deformation behavior, we determined the distribution of strain changes during dislocation avalanches and established its dependence on microcrystal size. Our results suggest that for sample dimensions on the micrometer and submicrometer scale, large strain fluctuations may make it difficult to control the resulting shape in a plastic-forming process. 相似文献
67.
Oszvald M Balázs G Tömösközi S Békés F Tamás L 《Journal of agricultural and food chemistry》2011,59(17):9664-9672
The aim of this work was to compare the effects of incorporated wheat storage proteins on the functional properties of rice and wheat flours. The advantage of rice as a base flour compared to wheat is that it does not contain any wheat flour components and, therefore, has no interactive effect between wheat glutenin proteins. The incorporation of individual HMW glutenin subunit proteins (Bx6, Bx7, and By8) in different ratios had significant positive effects on the mixing requirements of both rice and wheat doughs. Reconstitution experiments using two x+y type HMW-GS pairs together with a bacterially expressed LMW-GS have been also carried out in this study. The largest effects of polymer formation and mixing properties of rice flour dough were observed when Bx and By subunits were used in a 1:1 ratio and HMW and LMW glutenin subunits in a 1:3 ratio. However, using the same subunit ratios in wheat as the base flour, these synergistic effects were not observed. 相似文献
68.
A combined aquaculture-algae system was developed for the purification and reuse of effluent water from intensive fish production
in a combination of a high-rate algal pond and extensive fishpond. The integrated system was operated as a closed system,
thus the water demand was reduced through the recirculation of the treated water. The pilot-scale experimental system consisted
of three different compartments: tanks for intensive fish production, an algal pond where the excess nutrients are removed
by algae uptake and a fishpond where the produced algae biomass was consumed by fish. The objective of this study was to describe
and evaluate the nutrient transformation efficiency of the combined system through the analysis of the organic carbon, nitrogen
and phosphorus budgets. 相似文献
69.
Mria Oszvald Sndor Tmskzi Oscar Larroque Eszter Keresztnyi Lszl Tams Ferenc Bks 《Journal of Cereal Science》2008,48(1):68-76
While the effect of protein content and composition on the functional properties of wheat flour is well studied, our knowledge on the same properties of rice flour is limited. This work was conducted to study the relationship between the dough mixing properties of flour from different rice cultivars and protein content and composition. An efficient sonication-based two-step extraction procedure was applied to isolate rice flour proteins. The size-exclusion HPLC (SE-HPLC) method, originally developed for separating wheat proteins, was applied with some minor modifications in order to study the size distribution of rice flour proteins. Four fractions were distinguished on the SE-HPLC profile and were further characterized by SDS-PAGE. Fractions I–III consisted of glutelins, while fraction IV contained albumin, globulin and prolamin proteins. When rice dough was characterized on the basis of mixing parameters in a micro z-arm mixer, significant differences were observed depending on the protein composition of the flour. Statistical analysis results indicated that the functional properties of the flour from different rice cultivars were associated with the amount of polymeric proteins and their size distribution. 相似文献
70.
Journal of Plant Diseases and Protection - The insecticidal efficacy of the diatomaceous earth formulation DiatoSec® (Ediafilt Diatomite Mining and Processing Ltd., Hungary) against the... 相似文献