Dielectric properties of surimi at 915 MHz and 2450 MHz as affected by temperature, salt and starch     

Weijie  MAO  Manabu  WATANABE  Noboru  SAKAI 《Fisheries Science》2003,69(5):1042-1047

  相似文献   

Ontogeny of testicular inhibin and activin in ducks: An immunocytochemical analysis     

Peixin YANG  Mohamed S. MEDAN  Koji Y. ARAI  Wanzhu JIN  Gen WATANABE  Kazuyoshi TAYA 《Animal Science Journal》2005,76(5):427-434

The ontogeny of testicular inhibin/activin in ducks was investigated. Testicular localization of three inhibin/activin subunits (α, β_A and β_B) was determined in embryonic and newly hatched ducks from 12 days of incubation to 1 day of age, in immature ducks and in adult ducks. In the duck embryonic testis, positive α‐subunit immunostaining was first detected in the Leydig cells and Sertoli cells on day 15 of incubation, whereas β_A‐subunit and β_B‐subunit immunostaining were found in Sertoli cells and primary germ cells on day 18 of incubation. In 1 month old ducks, intense staining of α‐subunit was present in the seminiferous epithelium consistent with localization in Sertoli cells and primary germ cells, and the immunostaining of the β_A‐ and β_B‐subunit was also present in Sertoli cells and primary germ cells. Specific immunostaining with inhibin/activin α‐, β_A‐ and β_B‐subunits antisera occurred in Sertoli cells in the adult duck testes. In conclusion, it was shown that, in the duck testis, the majority of α‐, β_A‐ and β_B‐subunits are colocalized in Sertoli cells with a certain degree of staining in germ cells and the α‐subunit is present in Leydig cells of embryonic testes before day 18 of incubation. These results indicate that Sertoli cells and possibly germ cells in the embryonic testes of late stage of incubation and newly hatched ducks, immature ducks and mature ducks may produce bioactive inhibin dimers, inhibin A and inhibin B, as a possible regulator of follicle‐stimulating hormone secretion. Free inhibin/activin subunits and their dimers may also play an autocrine/paracrine role in the development of the testis and spermatogenesis. Furthermore, early onset of the α‐subunit in duck testes indicates that it may have an autocrine/paracrine effect on steroid hormones, which is important for sex differentiation.  相似文献   

Effects of loosing Aigamo ducks on the growth of rice plants, weeds, and the number of arthropods in paddy fields   总被引：2，自引：0，他引：2  

SEISHU TOJO  MASAHIRO YOSHIZAWA  TAKASHI MOTOBAYASHI  KENGO WATANABE 《Weed Biology and Management》2007,7(1):38-43

Aigamo duck farming has been noticed as one of the techniques of environmental conservation agriculture. This study was carried out to investigate the effects of loosing Aigamo ducks on the growth and production of rice plants, the quantity of weeds and arthropods, and the balance of nitrogen (N) in paddy fields by changing the density of the Aigamo ducks. A paddy field was divided into three test plots: a 10-Aigamo-duck plot, a five-Aigamo-duck plot, and a weeding plot. The results show that the height, number of culms, and yield crops of the rice plants increased more in the 10-Aigamo-duck plot and the five-Aigamo-duck plot than that of the weeding plot. Millet ( Echinochloa oryzicola ) remained in both the Aigamo duck plots. The weeding plot was covered with monochoria ( Monochoria vaginalis ). In both the Aigamo duck plots, the outbreak of total arthropods was lower than that of the weeding plot, but the number of rice plants damaged by grass leaf rollers ( Cnaphalocrocis medinalis ) was increased. The number of spiders, regarded as useful insects, did not differ that much between the experimental plots. The N content of the soil did not differ as an effect of loosing the Aigamo ducks. The rice plants in the 10-Aigamo-duck plot absorbed more N than the rice plants in the other plots.  相似文献   

家蚕微孢子虫感染家蚕对其中肠和血液蛋白酶活性影响   总被引：1，自引：0，他引：1  

龚舒聪  孙远挺  盛思佳  章彝  鲁兴萌 《蚕桑通报》2008,39(3)

本试验测定了不同浓度剂量微孢子虫感染家蚕后,家蚕中肠和血液中蛋白酶的变化.并对不同浓度剂量家蚕微孢子虫感染家蚕后对家蚕发育的影响和不同组织中所含微孢子虫孢子的浓度等作了初步的研究.从本实验中可以看出,感染不同浓度微孢子虫的家蚕,体内相同组织的微孢子虫数量存在显著差异.而感染相同浓度微孢子虫的蚕,不同组织中微孢子虫的数量也有差异,中肠的微孢子虫数量远高于其他部位.感染微孢子虫后,家蚕血液中的蛋白酶活性显著升高,中肠的蛋白酶的活性变化不显著,而感染微孢子虫的数量对血液和中肠中的蛋白酶的活性无显著影响.  相似文献   

五营林业局杨树河林场林种结构调整     

孙惠杰  宋国华  贾树庭  郭修生  董艳君 《林业勘查设计》2006,(2):53-55

在建立ArcViewGIS平台的杨树河林场地理信息系统的基础上,通过建立杨树河林场二维坡向图和坡度图、三维地面模型、二维河流、公路、城镇和林型分布专题图,用缓冲分析方法进行护岸林,护路林,环境保护林,水源涵养林等公益林的规划;商品林和一般用材林用蓄积等值图规划,在空间尺度上进行合理的划分林种,对杨树河林杨植物群落生长的立地条件进行研究。最后经过调整林种结构和林龄结构,以达到提高森林可持续经营能力的目的。  相似文献   

人工恢复与重建森林生态系统健康及其维护初探   总被引：5，自引：0，他引：5  

刘苑秋  刘光顺 《江西林业科技》2001,(5):15-17,32

人工恢复与重建森林生态系统，随着时间的推移，由于系统内生物个体与个体、个体与环境之间的关系变化而发生动态的变化，如果不能对系统的健康状况正确认识和维护，恢复的系统则可能再次退化，使荒山绿化、植被恢复不能达到预期目标。探讨了人工恢复与重建森林生态系统的健康评价方法及其维护对策。  相似文献   

Effect of a single injection of gonadotropin-releasing hormone (GnRH) and human chorionic gonadotropin (hCG) on testicular blood flow measured by color doppler ultrasonography in male Shiba goats     

Haney SAMIR  Kazuaki SASAKI  Eman AHMED  Aly KAREN  Kentaro NAGAOKA  Mohamed EL SAYED  Kazuyoshi TAYA  Gen WATANABE 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(5):549-556

Although color Doppler ultrasonography has been used to evaluate testicular blood flow in many species, very little has been done in goat. Eight male Shiba goats were exposed to a single intramuscular injection of either gonadotropin-releasing hormone (GnRH group; 1 µg/kg BW) or human chorionic gonadotropin (hCG group; 25 IU/kg BW). Plasma testosterone (T), estradiol (E2) and inhibin (INH) were measured just before (0 hr) and at different intervals post injection by radioimmunoassay. Testis volume (TV) and Doppler indices, such as resistive index (RI) and pulsatility index (PI) of the supratesticular artery, were measured by B-mode and color Doppler ultrasonography, respectively. The results indicated an increase in testicular blood flow in both groups, as RI and PI decreased significantly (P<0.05), but this increase was significant higher and earlier in hCG group (1 hr) than in the GnRH group (2 hr). A high correlation was found for RI and PI with both T (RI, r= −0.862; PI, r= −0.707) and INH in the GnRH group (RI, r=0.661; PI, r=0.701). However, a significant (P<0.05) correlation was found between E2 and both RI (r= −0.610) and PI (r= −0.763) in hCG group. In addition, TV significantly increased and was highly correlated with RI in both groups (GnRH, r= −0.718; hCG, r= −0.779). In conclusion, hCG and GnRH may improve testicular blood flow and TV in Shiba goats.  相似文献   

Effects of food enriched with egg yolk hydrolysate (bone peptide) on bone metabolism in orchidectomized dogs     

Toyokazu KOBAYASHI  Hiroshi KOIE  Arisa WATANABE  Arisa INO  Kazuya WATABE  Mujo KIM  Kiichi KANAYAMA  Kazuya OTSUJI 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(4):503-506

We examined the effects of chicken egg hydrolysate (also known as “bone peptide” or BP) on bone metabolism in 5- to 8-month-old orchidectomized dogs. The bone formation marker serum bone alkaline phosphatase (BAP) and the bone resorption marker urine deoxypyridinoline (DPD) were used as indicators to measure changes in bone metabolism. The following results were observed that Serum BAP was higher in dogs fed BP-enriched food throughout the clinical investigation. Serum BAP was statistically significantly higher in dogs fed BP-enriched food than in dogs fed non-BP-enriched food at 2 months after orchidectomy. This suggests that BP promoted bone formation immediately after orchidectomy.  相似文献   

Tooth brushing inhibits oral bacteria in dogs     

Kazuhiro WATANABE  Kotaro HAYASHI  Saku KIJIMA  Chie NONAKA  Kazuaki YAMAZOE 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(10):1323-1325

In this study, scaling, polishing and daily tooth brushing were performed in 20 beagle dogs, and the number of oral bacteria was determined using a bacterial counter. The dogs were randomized into the scaling (S), scaling + polishing (SP), scaling + tooth daily brushing (SB) and scaling + polishing + tooth daily brushing (SPB) groups. Samples were collected from the buccal surface of the maxillary fourth premolars of the dogs immediately after scaling and every week thereafter from weeks 1 to 8. Throughout the study, the number of bacteria was significantly lower in the SB and SPB groups compared with the S group. The findings suggest that daily tooth brushing inhibited oral bacterial growth in the dogs.  相似文献   

Different effects of an extended photoperiod treatment on growth,gonadal function,and condition of hair coats in Thoroughbred yearlings reared under different climate conditions     

Tsuyoshi SUZUKI  Hirotoshi MIZUKAMI  Yasuo NAMBO  Mutsuki ISHIMARU  Kenji MIYATA  Kentaro AKIYAMA  Kenji KOROSUE  Hiroshi NAITO  Kentaro NAGAOKA  Gen WATANABE  Kazuyoshi TAYA 《Journal of Equine Science》2015,26(4):113-124

  相似文献