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排序方式: 共有195条查询结果,搜索用时 15 毫秒
131.
Adriano EA Carriero MM Maia AA Silva MR Naldoni J Ceccarelli PS Arana S 《Veterinary parasitology》2012,185(2-4):110-120
A new species of the genus Henneguya (Henneguya multiplasmodialis n. sp.) was found infecting the gills of three of 89 specimens (3.3%) of Pseudoplatystoma corruscans and two of 79 specimens (2.6%) of Pseudoplatystoma reticulatum from rivers in the Pantanal wetland, Brazil. Partial sequencing of the 18S rDNA gene of the spores obtained from one plasmodium from the gills of P. corruscans and other one from the gills of P. reticulatum, respectively, resulted in a total of 1560 and 1147 base pairs. As the spores of H. multiplasmodialis n. sp. resemble those of Henneguya corruscans, which is also a parasite of P. corruscans, sequencing of the 18S rDNA gene of the spores of H. corruscans found on P. corruscans caught in the Brazilian Pantanal wetland was also provided to avoid any taxonomic pendency between these two species, resulting in 1913 base pairs. The sequences of H. multiplasmodialis n. sp. parasite of P. corruscans and P. reticulatum and H. corruscans did not match any of the Myxozoa available in the GenBank. The similarity of H. multiplasmodialis n. sp. obtained from P. corruscans to that from P. reticulatum was of 99.7%. Phylogeny revealed a strong tendency among Henneguya species to form clades based on the order and/or family of the host fish. H. multiplasmodialis n. sp. clustered in a clade with Henneguya eirasi and H. corruscans, which are also parasites of siluriforms of the family Pimelodidae and, together with the clade composed of Henneguya spp. parasites of siluriforms of the family Ictaluridae, formed a monophyletic clade of parasites of siluriform hosts. The histological study revealed that the wall of the plasmodia of H. multiplasmodialis n. sp. were covered with a stratified epithelium rich in club cells and supported by a layer of connective tissue. The interior of the plasmodia had a network of septa that divided the plasmodia into numerous compartments. The septa were composed of connective tissue also covered on both sides with a stratified epithelium rich in club cells. Inflammatory infiltrate was found in the tissue surrounding the plasmodia as well as in the septa. 相似文献
132.
Del Piero F 《Veterinary pathology》2000,37(4):287-296
Equine viral arteritis (EVA) can cause prominent economic losses for the equine industry. The purpose of this review is to provide the pathologist some familiarity with the clinical history, lesions, pathogenesis, and diagnosis of EVA. EVA is caused by an arterivirus (equine arteritis virus, EAV), and the vascular system is the principal but not unique viral target. EVA has variable presentations, including interstitial pneumonia, panvasculitis with edema, thrombosis and hemorrhage, lymphoid necrosis, renal tubular necrosis, abortion, and inflammation of male accessory genital glands. EAV antigen (EAVAg) can be demonstrated within the cytoplasm of epithelial cells such as alveolar pneumocytes, enterocytes, adrenal cortical cells, trophoblasts, thymus stroma, renal tubular cells, and male accessory genital gland cells. It can be also demonstrated within endothelia, in vascular, myometrial, and cardiac myocytes, macrophages, dendritelike cells of lymphoid organs, and chorionic mesenchymal stromal cells. In young and adult horses, following colonization of macrophages, the virus spreads systemically using circulating monocytes and enters the endothelium and tunica media of blood vessels, histiocytes, and dendritelike cells. Eventually, the virus multiplies within renal tubular cells. Lesions are uncommon in the aborted fetus; if present, they are mild, and EAVAg is frequently not detectable within fetal tissues and placenta. The clinical presentation and lesions of EVA may resemble those of other diseases. Complete pathologic examination associated with immunohistochemistry, virus isolation, and, especially in cases of abortion, serology will guarantee a directed and accurate diagnosis. 相似文献
133.
Del Piero F Wilkins PA Timoney PJ Kadushin J Vogelbacker H Lee JW Berkowitz SJ La Perle KM 《Veterinary pathology》2000,37(6):672-676
A case of fatal nonneurological equine herpesvirus 1 (EHV-1) infection in a yearling filly is described. Gross lesions included extensive pulmonary edema, prominent laryngeal lymphoid follicles, and congestion and edema of the dorsal third ventricle choroid plexus. Histologically, there was vasculitis, hemorrhage, and edema in the lungs and dorsal third ventricle choroid plexus as well as mild intestinal crypt necrosis with occasional intranuclear inclusion bodies. The perivascular and vascular inflammatory infiltrates were comprised mainly of T lymphocytes and macrophages. EHV-1 antigen was identified within the nucleus and cytoplasm of endothelial cells, dendritic-like cells of the pharyngeal lymphoid follicles, pharyngeal glandular epithelium, crypt enterocytes, and monocytes. Attempted virus isolation was negative. Weak seroconversion for EHV-1 was observed. Herpesvirus-like particles were identified within pharyngeal endothelial cells by transmission electron microscopy. Polymerase chain reaction amplified 369 and 188 base-pair fragments specific for EHV-1. The scarcity of pathognomonic viral inclusions and lesions in this case suggests that this disease may not be recognized, particularly in situations when ancillary laboratory procedures are limited. 相似文献
134.
135.
Carbohydrate histochemistry of the alimentary canal of the shi drum, Umbrina cirrosa L 总被引:2,自引:0,他引:2
Pedini V Scocco P Radaelli G Fagioli O Ceccarelli P 《Anatomia, histologia, embryologia》2001,30(6):345-349
Histochemical staining techniques, which differentiate the main categories of carbohydrates, were applied to sections from different segments of the alimentary canal of the shi drum Umbrina cirrosa L. to study patterns of distribution of epithelial glycoconjugates. In the oesophagus, mucous cells contained sulphomucins, together with a small amount of sialomucins. Stomach epithelial cells secreted neutral and acidic glycoconjugates, while gastric glands only produced small quantities of sialomucins. Goblet cells showed the presence of sialo and sulphomucins in the pyloric caeca, whereas intestinal mucous cells secreted sulphated glycoconjugates. This work serves as a baseline for further studies on carbohydrate composition of the mucosa of the shi drum digestive system. 相似文献
136.
137.
Anna Maria Gargiulo Vera Pedini Piero Ceccarelli 《Anatomia, histologia, embryologia》1990,19(3):264-268
The secretory process in swine apocrine sweat glands were studied by electron microscope. The sweat appeared to result from three different mechanisms: (a) fluid transport, probably involving a region of complex cellular interdigitations adjacent to the basement membrane, (b) exocytosis of vesicles, which in this species seem to be derived from the Golgi apparatus and finally (c) apocrine secretion. 相似文献
138.
Seven lectins (PNA, DBA, SBA, UEA I, LTA, WGA and ConA), conjugated with horseradish peroxidase, were used to characterize the glycosidic residues in the zygomatic gland of adult dogs. In some cases (PNA and DBA), lectin staining was preceded by neuraminidase digestion. The acinar and tubular cells produced glycoconjugates with different sugar residues, presenting binding sites for all of the lectins used. The apical surfaces of the cells lining the intra- and interlobular ducts were also stained by all the lectins. In contrast, the demilunar cells only reacted with the Neu-PNA sequence and Con A.
Abbreviations: Neu, neuraminidase; see also Table I 相似文献
139.
140.
Piero da Silva Agostini Edgar Garcia Manzanilla Carlos de Blas Alan G. Fahey Caio Abercio da Silva Josep Gasa 《Irish veterinary journal》2015,68(1)