全文获取类型
收费全文 | 230篇 |
免费 | 2篇 |
国内免费 | 1篇 |
专业分类
林业 | 29篇 |
农学 | 18篇 |
50篇 | |
综合类 | 17篇 |
农作物 | 4篇 |
水产渔业 | 19篇 |
畜牧兽医 | 78篇 |
园艺 | 2篇 |
植物保护 | 16篇 |
出版年
2022年 | 2篇 |
2021年 | 4篇 |
2020年 | 2篇 |
2019年 | 4篇 |
2018年 | 3篇 |
2017年 | 3篇 |
2016年 | 3篇 |
2015年 | 8篇 |
2014年 | 4篇 |
2013年 | 31篇 |
2012年 | 7篇 |
2011年 | 18篇 |
2010年 | 8篇 |
2009年 | 6篇 |
2008年 | 14篇 |
2007年 | 7篇 |
2006年 | 12篇 |
2005年 | 9篇 |
2004年 | 12篇 |
2003年 | 12篇 |
2002年 | 12篇 |
2001年 | 7篇 |
2000年 | 10篇 |
1999年 | 6篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1967年 | 1篇 |
1964年 | 1篇 |
1962年 | 1篇 |
排序方式: 共有233条查询结果,搜索用时 15 毫秒
71.
Munehiro Warashina Masanobu Tanaka Yoshio Tsujino Tuguo Mizoguchi Siro Hatakeyama Yasuaki Maeda 《Water, air, and soil pollution》2001,130(1-4):1505-1510
The results of ambient sulfur dioxide (SO2) and nitrogen dioxide (NO2) concentrations measured in ten cities of China and Korea by the improved passive samplers are reported. The property of this sampler is the utilization for the long-term exposure to the high level of SO2 and NO2. In this method, the conversion coefficients from the analytical data to the ambient concentrations were obtained from the comparison with the direct concentrations through the automatic analyzers for SO2 and for NO2, respectively. The interesting monthly variations were observed in the ambient SO2 and NO2 concentrations measured by this passive sampler method, which seems to give important information to the formation of acid rain in these countries. 相似文献
72.
Michinari YOKOHAMA Kenta WADA Masaru FUJITA Mai KOTANI Yoshio NAGURA Masako KANNO Kou NOMURA Takashi AMANO Yoshiaki KIKKAWA 《Animal Science Journal》2011,82(6):773-781
The coat of a goat, like that of many mammalian species, consists of an outer coat of coarse hairs and an under coat of fine, downy hairs. The coarse guard hairs are produced by primary follicles and the finer cashmere hairs by secondary follicles. We previously reported that hair keratins are components of cashmere hair, and proteomic analysis revealed that their expression is elevated in winter coat hair. To determine detailed characterization, we have cloned keratin 33A gene, a major highly expressed keratin in winter, and then analyzed the expression of goat hair coat. By Western analysis, we detected that keratin 33A protein is expressed only in hair coat among the various goat tissues. Moreover, the expression level in winter has increased in cashmere high‐producing Korean native breed, whereas the expression levels between summer and winter had not changed in cashmere low‐producing Saanen. In addition, by immunohistochemistry we determined that keratin 33A is localized in the major cortex portion of cashmere fiber. These results confirm that keratin 33A is a structural protein of goat cashmere hair fiber. 相似文献
73.
Kazuaki TANAKA Tatsuya TAKIZAWA Hayato MURAKOSHI Tashi DORJI Maung Maung NYUNT Yoshizane MAEDA Yoshio YAMAMOTO Takao NAMIKAWA 《Animal Science Journal》2011,82(1):52-56
The mithun (Bos frontalis), synonymous with mithan and gayal, is considered to be a domesticated form of gaur (B. gaurus). However, there has been a controversy concerning its origin. In an effort to address this issue, the mitochondrial cytochrome b (cytb) genes of 20 mithun from Myanmar and 13 from Bhutan were sequenced to trace its maternal origin. Seven cytb haplotypes were found in the 33 mithun, and the phylogenetic tree for these haplotypes clearly showed three embranchments involving five gaur types, a B. indicus type, and a B. taurus type. Sixteen Myanmar and 12 Bhutan mithun had gaur haplotypes, while a B. indicus haplotype was found in three Myanmar and one Bhutan mithun. The B. taurus haplotype was detected in a single Myanmar animal. These results demonstrated that the principal maternal origin of mithun was gaur and suggested that it was directly domesticated from gaur. However, some introgression of domestic cattle existed in current mithun populations. The presence of cattle mtDNA raised the question of how many cattle nuclear genes might have been integrated into the gene pool of mithun. 相似文献
74.
Masahide NISHIBORI Makoto HANAZONO Yoshio YAMAMOTO Masaoki TSUDZUKI Hiroshi YASUE 《Animal Science Journal》2003,74(5):437-439
Among the chicken breeds, White Leghorn (WL) and White Plymouth Rock (WR) are major breeds and have different history in their establishments. Whole mitochondrial DNA of the breeds were sequenced in order to elucidate the genetic relationship between the breeds. The lengths of the two WL and two WR mitochondrial DNA were found to be 16 788 and 16 785 base pairs, respectively. When the DNA sequences were compared, the similarity was found to be 99.96% (six nucleotide differences). In addition, the present study conformed the existence of an extra nucleotide ‘C’ in NADH dehydrogenase subunit 3 (ND3) of the chicken mitochondrial DNA, which has been consistently observed in Galliformes. 相似文献
75.
Yoshio Izawa Matazaemon Uchida Tatsuyoshi Sugimoto Toshiro Asai 《Pesticide biochemistry and physiology》1985,24(3):343-347
Buprofezin (Applaud, 2-tert-butylimino-3-isopropyl-5-phenyl-3,4,5,6-tetrahydro-2H-1,3,5-thiadiazin-4-one) strongly inhibited the [3H]chitin synthesis from N-acetyl-d-[1-3H]glucosamine in the brown rice planthopper, Nilaparvata lugens Stål. No inhibition was observed for [3H]-labeled protein biosynthesis from [5-3H]glucose or l-[3,5-3H]tyrosine but [3H]-labeled nucleic acid synthesis from [5-3H]glucose was weakly reduced by buprofezin. The lethal activity of buprofezin analogs related well to their inhibitory potency against chitin biosynthesis in N. lugens nymphs. 相似文献
76.
Masachika Hirano Nobushige Itaya Isao Ohno Yoshio Fujita Hirosuke Yoshioka 《Pest management science》1979,10(4):291-294
Thirteen pyrethroid-type esters of substituted 1(or 3)-hydroxymethylimidazolidine-2, 4-dione were synthesised and their knockdown activities against houseflies, mosquitoes and cockroaches were examined. Knockdown activities of 2,4-dioxo-1-prop-2-ynylimidazolidin-3-ylmethyl esters in oil solutions were higher than those of known knockdown pyrethroids; three of the compounds also possessed strong knockdown and flushing-out activities against cockroaches. 相似文献
77.
78.
Majekodunmi O Fatope Suad Khamis S Al Burtomani Yoshio Takeda 《Journal of agricultural and food chemistry》2002,50(2):357-360
The seeds of Punica granatum, known as hap roman in the Arabian Peninsula, are commonly eaten as a dessert. As part of an ongoing project to find nonnutritional natural products which have health benefits, or that can be exploited to protect crops, the chloroform-soluble extract of the fermented seeds of P. granatum was found to be rich in 1-O-trans,cis,trans-9,11,13-octadecatrienoyl glycerol (1). The seed oil is not lethal to brine shrimp larvae. 1-O-isopentyl-3-O-octadec-2-enoyl glycerol (2) and the known cis-9-octadecenoic, octadecanoic, and eicosanoic acids were also detected in small amounts in the seed oil by LC and MS. The structure of 1 was determined from NMR and MS spectral data. 相似文献
79.
Masuda T Inaba Y Maekawa T Takeda Y Tamura H Yamaguchi H 《Journal of agricultural and food chemistry》2002,50(21):5863-5869
A solution of carnosic acid quinone, which is a radical chain-termination product having no antioxidant activity in the antioxidant reaction of carnosic acid, recovers potent antioxidant activity upon standing. The HPLC analysis of an aged solution of carnosic acid quinone revealed that several antioxidants are produced in the solution. From the time-course and quantitative analyses of the formation of the products and their structural analysis, an antioxidant mechanism from carnosic acid quinone is proposed that includes a redox reaction of carnosic acid quinone in addition to the isomerization to lactone derivatives. In the first stage of antioxidation, carnosic acid, the reduction product from carnosic acid quinone, contributes to the potent antioxidant activity of the solution. This proposed mechanism can explain one of the reasons for the strong antioxidant activity of the extract of the popular herbs sage and rosemary. 相似文献
80.
Red-Yellow soils are widely developed on terraces and hilly lands in the south-western half of Japan. They do not show any evidence of bleaching in the lower part of the A horizon, and are characterized by an extremely strong acid reaction, and a very low base-status9). There are few studies on clay mineralogy of Red-Yellow soils in Japan. Egawa et al4). have reported on clay mineralogy of soils derived from the Pleistocene and the Tertiary sediments most of which may be regarded as Red-Yellow soils. Matsui and Katô10) have described clay minerals of Red-Yellow soils derived from the Pleistocene sediment in the environs of Shinjobara, Shizuoka Prefecture. These investigations indicated that clay minerals of Red-Yellow soils derived from the Pleistocene sediments consisted mainly of kaolin minerals, whereas those of Red-Yell ow soils derived from the Tertiary sediments were of the kaolin-illite association. 相似文献