全文获取类型
收费全文 | 242篇 |
免费 | 11篇 |
国内免费 | 1篇 |
专业分类
林业 | 29篇 |
农学 | 2篇 |
30篇 | |
综合类 | 13篇 |
农作物 | 9篇 |
水产渔业 | 11篇 |
畜牧兽医 | 149篇 |
园艺 | 5篇 |
植物保护 | 6篇 |
出版年
2021年 | 8篇 |
2020年 | 4篇 |
2019年 | 3篇 |
2018年 | 4篇 |
2017年 | 9篇 |
2016年 | 6篇 |
2015年 | 13篇 |
2014年 | 9篇 |
2013年 | 17篇 |
2012年 | 18篇 |
2011年 | 26篇 |
2010年 | 8篇 |
2009年 | 12篇 |
2008年 | 17篇 |
2007年 | 10篇 |
2006年 | 11篇 |
2005年 | 15篇 |
2004年 | 8篇 |
2003年 | 11篇 |
2002年 | 5篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1999年 | 4篇 |
1995年 | 1篇 |
1993年 | 1篇 |
1991年 | 3篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1966年 | 2篇 |
1963年 | 1篇 |
排序方式: 共有254条查询结果,搜索用时 15 毫秒
161.
Mototaka Hiki Masaru Usui Tetsuo Akiyama Michiko Kawanishi Mai Tsuyuki Saiki Imamura Hideto Sekiguchi Akemi Kojima Tetsuo Asai 《Irish veterinary journal》2014,67(1):14
Background
The aim of our study was to investigate the possible etiology of avian colibacillosis by examining Escherichia coli isolates from fecal samples of healthy broilers.Findings
Seventy-eight E. coli isolates from fecal samples of healthy broilers in Japan were subjected to analysis of phylogenetic background, virulence-associated gene profiling, multi-locus sequence typing (MLST), and antimicrobial resistance profiling. Phylogenetic analysis demonstrated that 35 of the 78 isolates belonged to group A, 28 to group B1, one to group B2, and 14 to group D. Virulence-associated genes iutA, iss, cvaC, tsh, iroN, ompT, and hlyF were found in 23 isolates (29.5%), 16 isolates (20.5%), nine isolates (11.5%), five isolates (6.4%), 19 isolates (24.4%), 23 isolates (29.5%), and 22 isolates (28.2%) respectively. Although the genetic diversity of group D isolates was revealed by MLST, the group D isolates harbored iutA (10 isolates, 71.4%), iss (6 isolates, 42.9%), cvaC (5 isolates, 35.7%), tsh (3 isolates, 21.4%), hlyF (9 isolates, 64.3%), iroN (7 isolates, 50.0%), and ompT (9 isolates, 64.3%).Conclusions
Our results indicated that E. coli isolates inhabiting the intestines of healthy broilers pose a potential risk of causing avian colibacillosis. 相似文献162.
163.
164.
Hideto Fukushima Koki Yamada Toshimichi Maeda Ritsuko Wada Masahiro Matsumiya 《Journal Of Aquatic Food Product Technology》2020,29(7):671-680
ABSTRACT Squid processed products such as dried-seasoned squid turn brown during storage, causing a change in quality. The main cause of this browning is melanoidin produced by the Maillard reaction. In this study, four types of squid were processed at different heating temperatures between 50 and 90°C and examined for suppression of the production of D-ribose, the main component of melanoidin. Furthermore, the color change of the squid meat with each heat treatment during storage of 32 days at 30°C was investigated. Bigfin reef squid and cuttlefish with a relatively high freshness decreased D-ribose generation as the heating temperature increased, and the browning during storage also decreased accordingly. In contrast, Humboldt squid with a low freshness did not generate new D-ribose at any heating temperature during storage. Nevertheless, the browning was reduced as the heating temperature increased. It is thought that the Maillard reaction was also reduced by the heat denaturation of muscular proteins. These results suggest that browning due to the Maillard reaction of squid meat is greatly affected by initial freshness and heating temperature. 相似文献
165.
166.
Katsuyoshi Hamada Yuji Tsutsumi Kazuchika Yamauchi Kazuhiko Fukushima Tomoaki Nishida 《Journal of Wood Science》2003,49(4):333-338
Ferulic acid (FA), tetradeuteroferulic acid (DFA), sinapic acid (SA), or heptadeuterosinapic acid (DSA) was exogenously supplied to poplar (Populus alba L.) callus. Administration of FA or SA increased the lignin content of the callus to about twice that of the control callus. Gas chromatographic analysis of the alkali hydrolysate of the cell wall residue revealed that only a trace amount of SA was bound to the cell wall, and the amount of FA was less than 2% of the total callus lignin. Thioacidolysis of the DFA-treated callus indicated that DFA is effectively converted to both coniferyl and sinapyl alcohols and then incorporated into the corresponding lignin. Incorporation of DSA into syringyl lignin or guaiacyl lignin was not observed, but yields of syringyl lignin thioacidolysis products were markedly increased by DSA treatment of the callus. These results suggest that SA may not be a precursor of sinapyl alcohol and syringyl lignin per se, but it may induce or enhance the biosynthesis of syringyl lignin in poplar callus. 相似文献
167.
Yasuyuki Matsushita Hitomi Sano Masanori Imai Takanori Imai Kazuhiko Fukushima 《Journal of Wood Science》2007,53(1):67-70
To study the behavior of hardwood sulfuric acid lignin (SAL) during phenolization, we compared the product yield, average
molecular weight, methoxy content, and reactions of simple model compounds with those of softwood SAL, focusing on the difference
between syringyl and guaiacyl units. The beech SAL reacted with phenol more readily than red pine SAL and yielded a larger
soluble fraction of phenolized SAL. To investigate the difference in the phenolization activity of the syringyl and guaiacyl
units in beech lignin, we prepared syringyl-nucleus-rich sulfuric acid lignin (S-rich-SAL) and guaiacyl-nucleus-rich sulfuric
acid lignin (G-rich-SAL) from beech, which were subjected to phenolization. The results suggest that the syringyl unit in
SAL had greater phenolization activity and its phenolized products were more soluble in acidic aqueous medium and introduced
less phenol than the guaiacyl unit. Using model compounds, the study also showed that the syringyl unit had higher phenolization
reactivity than the guaiacyl unit. 相似文献
168.
Effect of element type on the internal bond quality of wood-based panels determined by three methods
Three mechanical tests with different loading modes were conducted to evaluate the effect of element type on the internal bond quality of wood-based panels. In addition to the internal bond test, which is commonly used for mat-formed panels, interlaminar and edgewise shear tests were used to test oriented strandboard (OSB), particleboard, medium-density fiberboard (MDF) of two thicknesses, and plywood. The following results were obtained. Epoxy resin proved to be suitable for determining the interlaminar shear modulus instead of hot-melt glue. There was a linear relation between panel density and interlaminar shear modulus and a linear correlation between the interlaminar shear strength and internal bond (IB) strength for the mat-formed panels tested. OSB had the highest edgewise shear modulus, and MDFs had the highest edgewise shear strength in this study. The modulus/strength ratio also depended on both panel type and loading mode. The relation between the shear moduli determined from the edgewise and interlaminar tests indicated the characteristics of the shear properties of panels made of different elements.Part of this paper was presented at the Fourth International Wood Science Symposium, Serpong, Indonesia, September 2002 相似文献
169.
Summary Selective labeling of p-hydroxyphenyl-, guaiacyl-and syringylpropane moieties in protolignin was achieved by administration of corresponding 3H-labeled monolignol glucosides to differentiating xylem of pine. The growing process of the protolignin macromolecule in the specific morphological region was visualized by application of high resolution microautoradiography to the selectively labeled wood tissue.p-Hydroxyphenyl lignin is formed mainly in the compound middle lamella and cell corner in an early stage of cell wall differentiation. There are two peaks of deposition of guaiacyl lignin in the compound middle lamella at an early stage and in the secondary wall at a late stage. The content of condensed guaiacyl units is higher in the middle lamella than in the secondary wall lignin. Syringyl lignin is formed mainly in the inner layer of the secondary wall in a late stage as a minor structural moiety. During the formation of the cell wall, protolignin grows under definite biological regulations to a heterogeneous macromolecule which consists of various structural moieties arranged in a regular manner. The origin of the heterogeneous structure was explained as a result of the biogenesis of protolignin in the cell wall. 相似文献
170.
Tomoko Iwanaga Ryuji Fukushima Tomoka Nagasato Ikuro Maruyama Naoki Miura 《Journal of veterinary diagnostic investigation》2021,33(2):357
To date, coagulation tests are unable to reflect in vivo coagulation status in the same system, including platelet function, fibrin clot formation, and whole blood flow. The Total Thrombus Analysis System (T-TAS), which is a microfluidic assay that simulates conditions in vivo, measures whole blood flow at defined shear rates under conditions designed to assess platelet function (PL-chip) or coagulation and fibrin clot formation (AR-chip). The T-TAS records occlusion start time, occlusion time, and area under the curve. We evaluated this test in healthy control dogs. We also investigated the effect in vivo of acetylsalicylic acid (ASA), and the effect in vitro of an anticoagulation drug (dalteparin; low-molecular-weight heparin; LMWH). The CV of the AUC of both chips was good (CVs of 6.45% [PL] and 1.57% [AR]). The inhibition of platelet function by ASA was evident in the right-shift in the PL test pressure curve. The right-shift in the AR test pressure curves showed that the administration of LMWH inhibited both platelets and the coagulation cascade. The T-TAS may be useful in the evaluation of canine blood coagulation. 相似文献