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1.
Fenneropenaeus chinensis distributed in the Yellow Sea and Bohai Sea of China and the west coast of the Korean Peninsula. Different geographical populations represent potentially different genetic resources. To learn further the characteristics of different geographical population, crosses among two wild and three farmed populations were produced. The two wild populations were from the Yellow Sea and Bohai Sea (WYP), and the west coast of the Korean Peninsula and coast (WKN). The three farmed populations included the offspring of first generation of wild shrimp from coast in Korea (FKN), the Huang Hai (the Yellow Sea in Chinese) No.1 (HH1), and JK98. The phenotypes growth and survival rates of these populations were compared to confirm the feasibility for crossbreeding. The body length (BL), carapace length (CL). carapace width (CW), height of the second and third abdominal segment (HST), width of the second and third abdominal segment (WST), length of the first abdominal segment (LF), length of the last abdominal segment (LL), live body weight (BW), and survival rate were measured, Different combinations were statistically performed with ANOVA and Duncan's Multiple Range Test. The results show that the survival rate of JK98(♀)×WKN(♂) was the highest, followed by WYP(♀)×WKN(♂), FKN(♀)×WYP(♂), FKN(♀)×HHI(♂) and WYP(♀)×FKN(♂); the body weight of FKN(♀)×HHI(♂) was the highest, followed by FKN(♀)×WYP(♂), WYP(♀)×WKN(♂), WYP(♀)×FKN(♂) and JK98(♀)×WKN(♂); the total length had the same ranking as the body weight. All growth traits in hybrids JK98(♀)×WKN(♂) were the lowest among all combinations. F1 hybrids had significant difference (P〈0.05) in BL, CL, HST, LL, and BW; and insignificant difference (P〉0.05) in other growth traits and survival rate. The results of Duncan's Multiple Range Test are that BL and CL of J  相似文献   

2.
设k∈N,f(z)为复平面上的超越亚纯函数,φ(z)、ak-1(z),…,a0(z)为f(z)的小函数,且φ(z)≠0.置P(f)(z)=f^(k)(z)+ak-1(z),f^(k-1)(z)+…+a1(z)f(z)+a0,(z),且P(f)(z)不恒为常数.当k≤4时,满足Nr)(r,1/f)=S(r,f);k≥5,满足N4)(r,1/f)=S(r,f),则T(r,f)〈20N^-(r,1/φfP-1)+s(r,f).  相似文献   

3.
阅读提示近日,为贯彻落实《国务院关于促进节约集约用地的通知》(国发[2008]3号)精神,依据《产业结构调整指导目录(2011年本)》(国家发展改革委令第9号)和国家有关产业政策和土地供应政策,国土资源部、国家发展改革委联合制定了《关于发布实施(限制用地项目目录(2012年本))和(禁止用地项目目录(2012年本))的通知》(国土资发(2012398号)(简称《通知》)。  相似文献   

4.
通过对甘肃省白银市乌金峡一带中酸性侵入体的地质学、岩石化学、地球化学等研究,发现该侵人体高w(Na2O),低w(MgO)、w(TFeO)、w(Al2O3)、w(K2O),w(TiO2)、w(MgO)、w(MnO)、W(TFeO)、w(CaO)、w(K20)与w(SiO2)负相关,w(Na2O)与w(SiO2)正相关;轻、重稀土都有分异,但轻稀土更明显,且轻稀土富集,8(Eu)轻度正异常一亏损,大离子亲石元素Ba、Th、Sr富集,Rb、Li亏损,属同源岩浆演化的产物。岩浆结晶温度为700℃~890℃。形成时代大致为奥陶纪中晚期,属干岛弧构措环境,为中祁谇地块和北祁连洋间相互作用的结果。  相似文献   

5.
设f(z)为复平面上的超越亚纯函数,不具有形式Cexp(-Bz/A),其中A、B及C为复数,则T(r,f)可被f(z)的极点计数函数及Af(z)f'(z)+Bf ̄2(z)的a计数函数(a≠0)所控制。  相似文献   

6.
复平面上两个亚纯函数f(z)与g(z),若IM分担{∞},它们的一个导数IM分担1,则或者f(z)≡g(z),或者满足代数方程R(f,g)≡0,其中R(ω1,ω2)=ω^n(ω-1)^m-ω2^n(ω2-1)^m.  相似文献   

7.
对边界层理论新结果中出现的一类奇异积分方程w(t)=∫1 t(1-s)(λ+λs+s)/w(s)ds+(1-t)∫t 0s/w(s)ds,t∈(0,1)进行讨论,并得出了上述方程在λ∈(-1/2,0)上正解存在性的新结果。  相似文献   

8.
应用类比法构造一类三阶非线性微分方程组x=p(y),y=q(x)p(y)+g(z),z=-f(x)-h(x,y)的Liapunov函数,得到该系统全局稳定性的定理。  相似文献   

9.
选取1 日龄乌鬃鹅300 只,随机分成5 组,对照组(A)用基础饲粮饲养,实验组B~E 组分别在基础饲粮中添加质量分数1%(B 组)、2%(C 组)、3%(D 组)、4%(E 组)的螺旋藻,实验期63 d.结果表明:与对照组相比,添加螺旋藻对乌鬃鹅的屠宰率、半净膛率、腹脂率和肌肉灰分无显著影响(P〉0.05),对其它生长指标和全净膛率均有显著性影响(P〈0.05),其中2%C 组和3% D 组的料重比显著下降(P〈0.05), E 组全净膛率显著提高(P〈0.05);肌肉的粗蛋白质(CP)含量E〉D〉C〉B〉A,粗脂肪(EE)含量E〉A〉B〉C〉D;所测得的17 种氨基酸中,包括含有人体必需的7 种氨基酸(EAA)和2 种半必需氨基酸(HEAA);氨基酸评分(AAS)和化学评分(CS)最高的是赖氨酸(Lys),实验组的必需氨基酸指数(EAAI)均比对照组有所提高.添加2%~3%(w)的螺旋藻对生长性能有显著差异(P〈0.05),对粗脂肪、粗蛋白的含量有所改善;从肌肉EAAI 来看,添加螺旋藻后的肌肉蛋白质品质优于不添加螺旋藻的对照组.建议饲粮中螺旋藻的添加量为质量分数2%.  相似文献   

10.
3种塘鳢含肉率及肌肉营养成分分析与比较   总被引:1,自引:0,他引:1  
对褐塘鳢(Oxyeleotris marmoratus Bleeker)、尖头塘鳢(Eleotrisoxycephala Temminck et Schlegel)和线纹尖塘鳢(Oxyeleotris lineolatus)含肉率和肌肉营养成分进行了分析与比较。结果表明,含肉率以褐塘鳢为最高(51.26%),其次是尖头塘鳢(47.08%)和线纹尖塘鳢(42.53%)。3种圹鳢的蛋白质、灰分和水分含量基本一致,但粗脂肪的含量差异较大,最高为尖头塘鳢(0.33%),其次是褐塘鳢(0.23%)和线纹尖塘鳢(0.13%)。必需氨基酸含量大小依次是褐塘鳢(8.92%)〉尖头塘鳢(8.83%)〉线纹尖塘鳢(8.53%)。呈味氨基酸含量大小序是尖头塘鳢(7.72%)〉褐塘鳢(7.65%)〉线纹尖塘鳢(7.45%)。可见,三种塘鳢肉味鲜美、脂肪含量低、营养丰富,经济性状较好,值得推广养殖。  相似文献   

11.
This study describes the complete diaUel hybridization between newly introduced bay scallop stock (W) from Canada and local commercial stock (D) grown under laboratory conditions, in China. Larval survival and growth during all life stages (larvae, spat, and adult) were compared among hybrid (DW, WD) and purebred (DD, WW) populations. Significant heterosis was detected for survival during the larval stage (〉 1% of the mid-parent values). The mean heterosis (Hm) varied in growth throughout the life span. More than 50% of the Hm values were positive and negative in the DW and WD groups, respectively. The influence of maternal effects and mating types (intrapopulation vs. interpopulation crosses) on growth for all life stages was not consistent. Larval survival did not differ significantly (P〉0.05) with maternal effect or mating type. In the harvest stage, shell length (SL), shell height (SH), shell width (SW), and total weight (TW) were larger in the hybrid compared with the inbred groups. Positive Hm values were observed in SL (1.5%), SW (5.8%), and TW (12.3%), and were more significant in the DW groups (6.1%, 4.5%, 6.8%, and 27.2%). These results suggest that hybridization between two geographic populations is a good tool for improving bay scallop growth. However, unstable heterosis between the two populations requires further study.  相似文献   

12.
根据r-选择和k-选择的典型特征以及通过渐近体长(L∞)、渐近体重(W∞)、生长系数(K)、初次性成熟年龄(Tm)、最大年龄(Tmax)、瞬时死亡率(M)和种群繁殖力(PF)等七个生态学参数值分析,可以判断3种鲟鱼类种群为典型k-选择。应用平衡产量模式计算改变瞬时捕捞死亡率(F)和渔业补充年龄(Tc)时的产量变化,同样证实3种鲟科鱼类为典型的K型种群。作为渔业管理对策是严格控制捕捞强度,以保护渔业资源。  相似文献   

13.
对600尾菊黄东方[鱼屯](Takfugu flavidus) 1龄幼鱼在池塘养殖条件下的生长特性进行研究。结果表明;菊 黄东方[鱼屯]67日龄幼鱼经过127d的培育后,体长从( 3.53±0.73)cm增至( 10.33±0.98) cm,日均增长0.054 cm, 体长增长率193.14%;体质量从(2.41± 1.60)g增至( 54.39±13.62 ) g,日均增重0.413 g,体质量增长率2135.8%, 体质量与体长呈幕函数关系,关系式为:W=0.0448L30570 (R2=0.9922), b值接近于3,属等速生长型。体长 (l)与日龄(t)表现为线性相关:l= 0.0585t + 3.7811 (R2= 0.9621 ),体质量(w)与日龄(t)表现为指数相 关:w=3.3211e00286t (R2=0.9363)。  相似文献   

14.
4月21日,玉林市国土资源系统牵头召开全市县(市、区)、乡(镇)、村级干部国土资源法律知识宣传教育培训活动再动员大会。会议对全市县(市、区)、乡(镇)、村级干部国土资源法律知识宣传教育培训活动进行了工作部署,拟定陆川县为该市的宣教试点,试点工作将在5月下旬全面铺开。会上,市“宣传教育培训活动”办公室与7县(市、区)局(分局)签订了《玉林市县(市、区)级领导干部和乡(镇)、  相似文献   

15.
一、基本建设程序(一)流域(或区域)规划阶段流域(或区域)规划就是根据流域(或区域)的水资源条件和防洪状况及国家长远计划对该地区水利水电建设发展的要求,提出该流域(或区域)水资源的梯级开发和综合利用的方案及消除水害的方案。  相似文献   

16.
The diffuse attenuation coefficient for downwelling irradiance (Kd(λ)) is an important parameter for ocean studies. Based on the optical profile data measured during three cruises in the northern South China Sea in autumn from 2003 to 2005, variations in the Kd(λ) spectra were analyzed. The variability of Kd(λ) shows much distinct features in both magnitude and spectra pattern, it is much higher in coastal waters than that of open oceanic waters; and the blue-to-green (443/555) ratio of Kd(λ) tends to increase with chlorophyll a concentration ([Chl-a]) from open ocean to coastal waters. These characteristics can be explained most by the increase of aw+p(443)/aw+p(555) with [Chl-a]. In short waveband, the relation between Kd(λ)-Kw(λ) and [Chl-a] can be well described by a power law function, indicating the large contribution of phytoplankton to the variations in Kd(λ). As for the spectral model of the diffuse attenuation coefficient, there are good linear relationships between Kd(490) and Kd(λ) in other wavelengths with own slope and intercept of a linear functions in the spectral range 412-555 nm. Kd(490) is well correlated with the spectral ratio of remote sensing reflectance; and should enough measurement data are given, this empirical algorithm would be used in the Kd(λ) retrieval from ocean color satellite data. The variation in Kd(λ) provides much useful information for us to study the bio-optical property in the northern South China Sea.  相似文献   

17.
各省、自治区、直辖市及副省级城市国土资源主管部门、财政厅(局)、住房城乡建设厅(建委、建交委)、农业(农牧、农村经济)厅(局、委、办)。林业厅(局)、新疆生产建设兵团国土资源局、财务局、建设局、农业局、林业局,解放军土地管理局:  相似文献   

18.
Eight compounds were isolated from red alga Gymnogongrus flabelliformis Harv. In normal phase silica gel, Sephadex LH-20 gel column chromatography, reverse phase HPLC, and recrystallization. Based on MS and ID NMR spectroscopic data, their structures were determined as: stigmast-4-en-3-one (Ⅰ), cholest-4-en-3-one (Ⅱ), cholesterol (m), uracil (Ⅳ), uridine (V), adenosine (Ⅵ), succinic acid (Ⅶ), and 5-hydroxy-4-methyl-5-pentyl-2,5-dihydro-furan-2-on (Ⅷ). All of them were obtained from this species for the first time. Cytotoxicity of these compounds was screened using standard MTT method, but all the compounds were inactive (IC50 〉 10 μg/ml).  相似文献   

19.
[案情介绍] 2007年3月份,某市土地储备中心以其收购的储备土地,向该市土地登记中心提出国有土地使用权登记申请,并希望就国有土地使用权设定抵押,提供了以下材料:(一)国有土地使用权登记申请书;(二)地籍测量成果;(三)事业单位法人登记证,法定代表人身份证明书。及法人身份证明;(四)土地储备机构和银行签订的贷款意向书;(五)市政府同意收购土地的批准文件;(六)原土地使用者的国有土地使用证及注销证明文件;(七)房管部门注销《房屋所有权证》的证明文件;(八)国有土地使用权收购合同。  相似文献   

20.
为进一步加强该市国土资源管理工作。营造良好的国土资源管理工作氛围.切实加大对各乡镇(街道)国土资源管理工作的指导力度,余姚局建立了国土资源管理所工作人员常驻乡镇(街道)工作制度。制度要求各国土所(分局)根据在职工作人员和所管辖的乡镇(街道)实际情况,在每个乡镇(街道)安排1—2名常驻工作人员,重点做好土地、矿产执法监察工作。对常驻乡镇(街道)工作人员要求在乡镇(街道)固定地点办公。  相似文献   

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