策勒黑羊选育现状及其对策   总被引：2，自引：1，他引：1  

高志英  杨权有  哈迪夏  马合木提  米日尼沙汗  袁军  许椿善  日介甫  於建国  古丽格娜 《中国畜牧兽医》2008,35(7):155-156

策勒黑羊是以生产羔皮为主的多胎优良地方品种,深受当地群众的喜爱。作者从育种的角度阐述了策勒黑羊选育现状及存在的问题,提出了今后的选育方向和对策。  相似文献   

Expression of natural killer cell stimulatory receptor NKG2D and its ligand MICA in Tibetan patients with gastric cancer at Qinghai plateau     

YANG Sheng-xi  ZHANG Xiao-yan  LUTong-de  HA Xiao-qin  WANG Hai-yan  GENG Pai-li 《园艺学报》2008,24(5):1002-1006

AIM: To investigate the expression of natural killer cell stimulation receptor D(NKG2D) in peripheral blood and the expression of major histocompatibility complex class I chain-related protein A(MICA) on the gastric carcinoma tissue and the neighboring non-cancerous tissue in Tibetan patients with gastric cancer at Qinghai plateau. METHODS: Samples of 33 patients and 20 healthy persons were collected to detect NKG2D in peripheral blood by Flow cytometry analysis. The expressions of MICA in part of the correspondent tissues were examined by RT-PCR and immunohistochemistry.RESULTS: The expression of NKG2D in the plateau of Tibetan patients with gastric cancer group (13.47 ±5.26)% was significantly lower than that in healthy groups (32.62±10.08)%. The mRNA level of MICA in gastric cancer was significantly higher than that in neighboring non-cancerous tissue (P<0.05). The expressions of MICA proteins showed a significant difference between the neighboring non-cancerous tissue (21.21%, 7/33) and the gastric carcinoma tissue (78.79%, 26/33), between the high differentiation (60.00%, 3/5) and the moderate (72.73%, 8/11), low differentiation (88.24%, 15/17). The expressions of MICA were not correlated with tumor size, sex, age, lymph node metastasis of the patients (P>0.05). Spearman rank correlation displayed that the expressions of MICA mRNA were positively correlated with the MICA protein level (r=0.903, P<0.01).CONCLUSION: The immune escape in Tibetan patients with gastric cancer at Qinghai plateau probably relates to the down-regulation of NKG2D and the up-regulation of its ligand MICA. The activity of NK cells and the anti-cancer cellular immunity level are descending in the plateau of Tibetan patients with gastric cancer. The decrease in the receptor NKG2D is a reason for the activity of NK cell descending.  相似文献   

Unrecognized diversity in New Guinean crayfish species (Decapoda,Parastacidae): The evidence from molecular data          下载免费PDF全文

Martin BLÁHA  Jiří PATOKA  Pavel KOZÁK  Antonín KOUBA 《Integrative zoology》2016,11(6):457-468

The phylogenetic relationships among imported ornamental crayfish belonging to the genus Cherax were inferred from a combined dataset of 3 mitochondrial genes (COI, 16S and 12S) and by comparison with available GenBank sequences of 14 Cherax species. Furthermore, the concordance of previously described species obtained from a wholesaler (Cherax boesemani, C. holthuisi and C. peknyi) with available GenBank sequences was verified based on COI with special respect to comparison with sequences assigned as Cherax species. Recently described species C. gherardiae, C. pulcher and C. subterigneus belong to the northern group of Cherax species. Comparison and analysis with other GenBank COI sequences show previously unreported diversity of New Guinean species, suggesting 5 putative new species. Surprisingly, species assigned to the subgenus Astaconephrops do not form a monophyletic clade; this subgenus should be reappraised relative to the purported typical morphological characteristic of the uncalcified patch on male chelae. Increasing importation of crayfish underscores the importance of accurate species identification. Use of basic molecular methods is a necessary requisite for documenting occurrence, abundance and population trends of target species. Consequently, it helps to support eventual conservation decision‐making by stakeholders.  相似文献   

The influence of diel period on fish assemblage in the unstructured littoral of reservoirs     

M. ŘÍHA  J. KUBEČKA  M. PRCHALOVÁ  T. MRKVIČKA  M. ČECH  V. DRAŠTÍK  J. FROUZOVÁ  E. HOHAUSOVÁ  T. JŮZA  M. KRATOCHVÍL  J. PETERKA  M. TUŠER  M. VAŠEK 《Fisheries Management and Ecology》2011,18(4):339-347

Abstract Diel changes in littoral fish assemblage were studied in four reservoirs in the Czech Republic (Central Europe). The sampling was performed by beach seining in an unstructured littoral zone. Perch, Perca fluviatilis L., roach, Rutilus rutilus (L.), bream, Abramis brama (L.), carp, Cyprinus carpio L., ruffe, Gymnocephalus cernua (L.), pikeperch, Sander lucioperca (L.), eel, Anguilla anguilla (L.) and A. brama × R. rutilus hybrids exhibited higher densities at night. Only bleak, Alburnus alburnus (L.) exhibited higher densities during the day. The number of species was higher in night hauls, and mean body size of roach and bleak was also higher at night. Diel changes in fish densities resulted in the change in species composition between day and night. The study has implication for the sampling design to assess littoral fish assemblages using beach seine netting and recommends night sampling for a representative assessment or sampling during both diel periods for a robust assessment.  相似文献   

高pH胁迫对“黄海1号”中国对虾免疫相关酶的影响   总被引：3，自引：0，他引：3  

哈承旭  刘萍  何玉英  李健  李霞 《中国水产科学》2009,16(2)

对高pH养殖水体中"黄海1号"中国对虾(Fenneropenaeus chinensis)群体和野生群体的存活率,血清中的溶菌酶(LSZ)、酚氧化酶(PO)、超氧化物歧化酶(SOD)、碱性磷酸酶(AKP)及酸性磷酸酶(ACP)活力变化进行了测定.经高pH胁迫72 h后检测发现,在pH8.2～8.6,"黄海1号"和野生群体存活率均高于90%,两群体机体表现出一定的应激能力;在pH8.8～9.0时,"黄海1号"及野生群体死亡率都急剧增加,几种免疫相关酶类较在pH 8.6时都有较高幅度的变化,"黄海1号"的死亡率及酶突变程度均小于野生群体;在pH 9.2时,2群体的死亡率及体内的几种免疫相关酶活性变化幅度继续增大,但2群体间差异减弱;在pH 9.4时,两群体中国对虾全部死亡.比较发现,当海水pH在一定的范围内升高时,"黄海1号"免疫能力要高于野生群体.  相似文献   

石菖蒲挥发性组分提取方法的对比研究     

戴箭  哈成勇  张镜澄  刘峻岭 《林产化学与工业》2005,25(4):43-46

采用超临界CO2流体萃取（SCFE）与分级分离技术联用提取石菖蒲挥发性组分．并与水蒸气提取（HD）法所得挥发油进行了对比,发现挥发油成分相对含量有所差异。在SCFE挥发油中烯烃单萜、倍半萜类的相对含量高;而含氧单萜、含氧倍半萜类则正好相反．HD法所提挥发油中含氧萜类明显高于SCFE。其主要有效成分口一细辛醚在SCFE和HD所提挥发油中的相对含量分别为52．84％和38．67％,这说明SCFE对口一细辛醚的提取有较好的选择性。  相似文献   

Physical forcing on fish abundance in the southern California Current System          下载免费PDF全文

Lia Siegelman‐Charbit  J. Anthony Koslow  Michael G. Jacox  Elliott L. Hazen  Steven J. Bograd  Eric F. Miller 《Fisheries Oceanography》2018,27(5):475-488

The California Current System (CCS) is an eastern boundary current system with strong biological productivity largely due to seasonal wind‐driven upwelling and transport of the California Current (CC). Two independent, yet complementary time series, CalCOFI ichthyoplankton surveys and sampling of southern California power plant cooling‐water intakes, have indicated that an assemblage of predominantly cool‐water affinity fishes spanning nearshore to oceanic environments in the southern CCS has declined dramatically from the 1970s to the 2000s. We examined potential oceanographic drivers behind this decline both within and north of the CalCOFI survey area in order to capture upstream processes as well. Empirical orthogonal function (EOF) analyses using output from a data‐assimilative regional ocean model revealed significant relationships between the fish time series and spatial patterns of upwelling, upper ocean heat content and eddy kinetic energy in the CCS. Correlation and linear regression analyses indicated that the declining trend in fish abundance was correlated with a suite of factors: reduced offshore and increased inshore upwelling; a long term warming trend combined with more recent interannual variability in ocean temperature; weaker eddy kinetic energy north of Point Conception (35°N), potentially indicating reduced transport of the California Current (CC); increased influence of the California Undercurrent (CUC); and a decline in zooplankton displacement volume across the southern CCS. Understanding how changes in oceanography affect fish populations will offer insights into managing fisheries in a changing climate.  相似文献   

气相色谱法检测辐照牛肉中的碳氢化合物   总被引：1，自引：0，他引：1  

李安  哈益明  王锋 《核农学报》2009,23(4)

利用气相色谱法分析牛肉辐照前后碳氢化合物的类型与浓度差异,建立了一种能判别辐照牛肉的鉴定方法。本试验通过正己烷溶剂萃取,Florisil柱分离和气相色谱分析,对辐照牛肉产生的6种碳氢化合物进行了定性和定量分析。研究结果表明,牛肉经辐照处理后,显著产生1,7-C16:2(1,7-十六二烯),而在未辐照的牛肉中没有检测到,因而1,7-C16:2是鉴定牛肉是否经过辐照处理的最适合标志物。  相似文献   

The effect of fermented apple diet supplementation on the growth performance and meat quality in finishing pigs     

Sung Dae LEE  Hoi Yun KIM  Hyun Jung JUNG  Sang Yun JI  Rekha CHOWDAPPA  Ji Hee HA  Young Min SONG  Jun Cheol PARK  Hong Kil MOON  In Cheul KIM 《Animal Science Journal》2009,80(1):79-84

The objective of the present study was to investigate the effect of fermented apple diet (FAD) supplementation on the growth performance and meat quality in finishing Berkshires. The FAD was made from dropped apple mixed with rice bran and barley bran. Until 81 ± 1 kg live weight at 133 ± 1 days, the animals were fed a growing diet, after which experimental samples were fixed at 0, 2, 4 and 6% FAD as C, T1, T2 and T3 in the finishing diets. Growth performance, ADG, ADFI and feed efficiency were improved in T1 than other groups. In carcass parameters, carcass weight was higher ( P  < 0.05) in T1 than in other groups. In meat quality, moisture and crude protein contents decreased ( P  < 0.05) by addition of FAD. pH₂₄ and WHC were higher ( P  < 0.05) in T1 than other groups. In sensory evaluation, marbling of fresh meat and tenderness, juiciness, flavor and overall acceptability of cooked meat were improved by the addition of FAD. According to the results of our experiment, FAD can be used for improvement of meat quality parameters.  相似文献   

火焰原子吸收光谱法测定奶粉中锌的含量   总被引：13，自引：0，他引：13  

哈玲津  王金娥  王变银 《畜牧与饲料科学》2009,30(4)

采用原子吸收光谱法测定多种品牌奶粉中锌的含量,对干法消化奶粉所用混合酸的组成、比例等试验条件进行了研究,其最佳样品处理条件为:硝酸-高氯酸(4+1)作为溶解用酸,1 mol/L盐酸作为定容用酸,测定结果的相对标准偏差小于2%.  相似文献