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1.
Erythrocytes: pits and vacuoles as seen with transmission and scanning electron microscopy 总被引：3，自引：0，他引：3
Vacuoles containing inclusions were observed by transmission electron microscopy in erythrocytes of a splenectomized patient with hemoglobin Ann Arbor. The membranes of these vacuoles became fused with the surface membrane of the red cell, thus opening the vacuoles and exposing their contents to the outside. These vacuoles when they have become thus attached to the cell membrane of the erythrocyte are responsible for the pits observed with scanning electron microscopy. 相似文献
2.
Histocompatibility-2 (H-2) polymorphism in wild mice 总被引：4，自引：0，他引：4
J Klein 《Science (New York, N.Y.)》1970,168(937):1362-1364
Red blood cells of 40 wild mice captured at four different locations in the Ann Arbor area were typed for the presence of 15 different H-2 antigens by direct hemagglutination test. Fifteen different phenotypes were found and all were different from those determined by known H-2 alleles of the laboratory mice. Great similarity between phenotypes of mice from the sane location was observed. This is interpreted as further evidence for the deme structure of natural mouse population. 相似文献
3.
[目的]扩增固原鸡（白羽、麻羽、红羽）、肉鸡品种AA鸡及蛋用品种罗曼鸡线粒体ATPase 8（ATP酶第8亚基）基因。[方法]从鸡血液中提取基因组DNA。然后,利用已经公布的鉴别检测鸡的源性成分的特异性引物,PCR扩增线粒体ATPase 8基因并测序。[结果]固原鸡不同品系和AA鸡的ATPase 8基因全序列为165 bp,罗曼鸡为168 bp。[结论]不同品系固原鸡的ATPase 8基因序列与罗曼鸡和AA肉鸡均有较高的同源性,但是与鹌鹑、鹧鸪、鸵鸟、鹅、火鸡的同源性相对较差。 相似文献
4.
L H Hempelmann 《Science (New York, N.Y.)》1968,160(824):159-163
The incidence of thyroid carcinoma and of clinically palpable thyroid nodules is compared in three groups of individuals many years after exposure to ionizing radiation in childhood or infancy. The estimated mean cumulative doses to the thyroid gland ranged from 20 rad in the Ann Arbor series irradiated with x-rays as infants for thymic enlargement upward to 1225 rad of mixed radiation (including that from ingested radioiodine) in the Marshallese children. Intermediate between these extremes is the high-risk subgroup in the Rochester series of persons irradiated for thymic enlargement; they received an estimated mean thyroid dose of 335 rad. A plot of the incidence of thyroid nodularity against the total cumulative thyroid dose gives what could be a linear dose response with no threshold or, at least, a threshold below 20 rad. The risk of developing carcinoma in the three studies ranges from 0 to 5.5 cases and that for nodularity 38 to 52 cases per 106 persons exposed per rad (thyroid dose) per year. There is evidence dence from animal experimentation that the biologically effective dose in the case of the Marshallese would have been considerably lower than the cumulative physical dose; hence, the dose response might actually be curvilinear at least in the higher dose range. In view of the uncertainties regarding dose and the assumptions made in my study, the risk values may not be exact; however, these values reflect the trends regarding risks estimated from the best available data in man. Furthermore, the estimated risk values apply only if radiation exposure occurred in childhood. 相似文献
5.
以不同年份和加工过程中的安茶为研究材料,采用高效液相色谱技术对儿茶素和茶黄素在储存、加工中的变化进行定量分析,结合感官审评,对加工和存放过程中物质变化和感官进行分析。结果表明,儿茶素与茶黄素含量在加工过程中和陈化期间均有降低的趋势,储存6年的安茶呈现出明显的陈醇特点。研究结果对于适度陈化安茶,提高产品质量,推动安茶产业的发展具有重要的意义。 相似文献
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试验选用 1日龄ArborAcres(AA)肉用仔鸡 180只 ,随机分成 6组 ,每组 30只。采用 2× 3因子设计 ,选用 0、5 0、10 0mg/kg3种锌添加水平 ;质量分数为 0 .0 0 75、0 .0 12 5 2种钙水平 ,研究不同的蛋氨酸锌 (Met-Zn)、Ca水平对肉用仔鸡生产性能的影响。结果表明 ,饲粮Met-Zn水平不同时 ,高钙都具有抑制肉用仔鸡生长和降低饲料效率的作用 ;与低钙组试鸡相比 ,3、5、7周龄体重均显著降低 (P <0 .0 5 )。 相似文献
8.
旨在研究益加康对AA+肉鸡的应用效果.将1日龄240只AA+肉仔鸡随机分为A、B、C、D四组,试验组添加不同浓度的相应产品,饲喂1～42日龄,取不同日龄肉鸡检测其生产性能及血液生化指标.结果表明,与空白组相比A、B组肉鸡日增体质量、脾指数、胸腺指数、血清TP和AKP的活性显著增加(P＜0.05或P＜0.01);血清Urea及血清中CK、LDH的活性显著降低(P＜0.05或P＜0.01).结果提示益加康对AA+肉鸡有明显促进生长,降低料肉比,提高机体免疫力和抗应激能力. 相似文献
9.
本试验以ＡＡ肉鸡父母代和商品代为材料,对其血浆中生长激素（ＧＨ）、甲状腺素（Ｔ４）、三碘甲腺原氨酸（Ｔ３）和皮质酮进行了测定,并对部分鸡进行马立克强毒接种,以探讨血浆激素与Ｔ淋巴细胞活性间的关系。结果表明,７周龄不同基因型鸡间血浆激素含量存在明显差异。血液Ｔ淋巴细胞活性在商品代明显高于父母代。马立克强毒接种后血浆高、低皮质酮水平间Ｔ淋巴细胞活性有明显差异。相关估计结果表明,血浆激素含量大多与Ｔ淋巴细胞呈低正相关,而皮质酮与Ｔ淋巴细胞呈负相关（Ｐ＜０．０５）。本研究结果指出,激素受环境因素影响较大,应用于抗病育种仍需进一步研究。 相似文献
10.
Arabinosylcytosine induces fetal hemoglobin in baboons by perturbing erythroid cell differentiation kinetics 总被引：9，自引：0，他引：9
T Papayannopoulou A Torrealba de Ron R Veith G Knitter G Stamatoyannopoulos 《Science (New York, N.Y.)》1984,224(4649):617-619
Arabinosylcytosine, a compound that inhibits DNA synthesis in rapidly dividing cells, stimulates fetal hemoglobin in adult baboons and produces significant perturbations in the pools of erythroid progenitors. It appears that changes in the kinetics of erythroid cell differentiation rather than direct action on the gamma genes underlie stimulation of fetal hemoglobin in the adult animals in vivo. These results also suggest that chemotherapeutic agents selected for their low carcinogenic or mutagenic potential could be used for therapeutic induction of fetal hemoglobin in patients with sickle cell anemia. 相似文献
11.
通过样方调查,应用物种丰富度、物种多样性指数和群落均匀度等指标对分布在浙江丽水太山山地的芒萁灌草丛不同恢复阶段的物种多样性进行了研究.结果表明,芒萁群落乔木种类较为单一,物种的丰富度、多样性和均匀性都随年龄增加而逐渐增加,灌木层的物种丰富度和物种多样性指数最大,草本层次之,乔木层最小,灌木层-草本层-乔木层的物种多样性依此递减.根据分布生境、群落结构和种类组成,可将该山地灌草丛分为三个类型,即马尾松芒萁群落、杉木芒萁群落和杜鹃芒萁群落. 相似文献
12.
张容昶 《甘肃农业大学学报》1985,(3)
本文根据国内外有关资料,阐述了牦牛适应少氧环境的生态生理特性,主要表现在胸腔和心、肺脏发达;气管粗短,呼吸、脉搏变化幅度大;血液中红细胞和血红蛋白含量高,血红蛋白类型组成变化较特殊,初生牦牛犊血液中含有早期胎儿血红蛋白等。并对上述特性作了初步分析和讨论。本文为牦牛选育、饲牧管理提供了一些依据。 相似文献
13.
COLLINS RE 《Science (New York, N.Y.)》1961,133(3464):1593-1594
A mathematical theory is developed to explain the observed enhancement of oxygen transport through solutions by hemoglobin. At high partial pressures of oxygen, ordinary diffusion through the solvent accounts for all transport of oxygen, but at low partial pressures the transport may be increased many fold by the presence of hemoglobin. This phenomenon is explained and the possible role of this phenomenon in living organisms is discussed. The theory also indicates a new method of determining dissociation curves from diffusion experiments. 相似文献
14.
Cache Valley virus was isolated from Culiseta inornata mosquitoes collected in Utah. The newly isolated agent causes signs of encephalitis in mice inoculated intracerebrally. It has been classified with the Bunyamwera group of anthropod-borne (Arbor) viruses. 相似文献
15.
In vivo studies of the biosynthesis of chick hemoglobins 1 and 2 showed an over-all higher incorporation of glycine-2-C(14), valine-4-C(14), valine-1-C(14), leucine-G-C(14), and histidine-(2-ring)-C(14) in hemoglobin 2; in vitro studies made with intact nucleated chick erythrocytes showed the higher incorporation of glycine-2-C(14), valine-1-C(14), and histidine-(2-ring)-C(14) in hemoglobin 1. Hybridization of chick hemoglobins produced an electrophoretically distinguishable new component. 相似文献
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17.
甘德芳 《安徽农业大学学报》2005,32(1):87-90
通过调查合肥地区野生蔬菜的资源,发现有开发利用价值的野生蔬菜70余种,其中菊科居多.记述主要野生蔬菜的植物学性状、生长环境及食用方法等,探讨野生蔬菜资源在开发利用中应注意的问题. 相似文献
18.
M H Crawford 《Science (New York, N.Y.)》1966,154(747):398-399
Four hemoglobin phenotypes have been noted in the pigtailed monkey ( Macaca nemestrina). Pedigree studies suggest a simple codominant Mendelian explanation for inheritance of three of these phenotypes, including one electrophoretically identical with human type A. The fourth type occurred in only one animal in this series. 相似文献
19.
【目的】比较2种有机铬源(吡啶羧酸铬和柠檬酸铬)及其不同添加水平对肉仔鸡血液生化指标和腹脂率的影响,为有机铬在生产中的应用提供依据。【方法】选取1日龄爱拔益加肉鸡450只,随机分为5组(共5个处理),每组3个重复,每个重复30只。对照组按"NRC肉鸡标准推荐量"标准饲喂基础日粮,4个试验组分别饲喂添加0.25和0.50mg/kg吡啶羧酸铬及0.25和0.50mg/kg柠檬酸铬的日粮,试验期为42d。分别于28日龄和42日龄翅静脉采血,分离血清进行血清生化指标(血糖、总蛋白、白蛋白、球蛋白、尿酸、总胆固醇、甘油三酯、高密度脂蛋白和低密度脂蛋白)的测定。【结果】试验前期(1～28日龄),日粮中添加低浓度(0.25mg/kg)柠檬酸铬组肉仔鸡的血糖浓度显著低于添加高浓度(0.50mg/kg)柠檬酸铬组(P0.05);添加高浓度(0.50mg/kg)吡啶羧酸铬组肉仔鸡总蛋白含量显著高于添加高浓度(0.50mg/kg)柠檬酸铬组和对照组(P0.05);添加低浓度吡啶羧酸铬组肉仔鸡血液中高密度脂蛋白浓度显著高于添加高浓度柠檬酸铬组(P0.05)。试验后期(29～42日龄),日粮中添加高浓度柠檬酸铬组肉仔鸡血糖浓度显著低于对照组(P0.05),添加低浓度吡啶羧酸铬组肉仔鸡甘油三酯含量显著高于对照组(P0.05)。【结论】肉仔鸡生长前期日粮中添加0.25mg/kg柠檬酸铬可显著降低肉仔鸡血糖浓度(P0.05);添加0.50mg/kg吡啶羧酸铬可显著提高总蛋白含量(P0.05);后期日粮中添加0.50mg/kg柠檬酸铬可显著降低肉仔鸡血糖浓度(P0.05),添加0.25mg/kg吡啶羧酸铬对甘油三酯有显著影响(P0.05)。日粮中添加两种铬后,肉仔鸡的腹脂率在生长前期有所降低,而后期又呈增高趋势。 相似文献
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目的:观察小剂量伊那普利治疗肾移植术后红细胞增多症的效果及安全性。方法:46例肾移植后红细胞增多症患者随机分为两组:小剂量组(n=29)和常规剂量组(n=17)。分别应用血管紧张素转换酶抑制剂伊那普利小剂量和常规剂量治疗,用药期间观察患者的外周血红细胞数、血红蛋白、红细胞压积和血压的变化及不良反应。结果:服用伊那普利2~3个月,两组患者外周血红细胞数、血红蛋白及红细胞压积降至正常水平,但常规剂量组出现低血压5例,肾功能损害2例,而小剂量组仅2例在用药期间出现低血压,予以伊那普利减量后血压恢复正常。结论:小剂量血管紧张素转换酶抑制剂对肾移植术后红细胞增多症的治疗是安全和有效的。 相似文献