百草枯与肾上腺皮质激素对大鼠胎儿动脉管收缩的影响

试验研究了百草枯与肾上腺皮质激素对大鼠胎儿动脉管收缩的影响。结果表明:百草枯对大鼠胎儿动脉管具有明显的收缩作用,试验组与对照组比较差异显著(P<0.05);肾上腺皮质激素对大鼠胎儿动脉管具有明显的收缩作用,试验组与对照组比较差异显著(P<0.05);百草枯和肾上腺皮质激素引起收缩的临界期均为胎龄19~20 d;百草枯促进妊娠末期母鼠分泌大量肾上腺皮质激素。这说明百草枯和肾上腺皮质激素可影响大鼠胎儿动脉管的收缩。     

百草枯引起胎鼠动脉管收缩与肾上腺皮质激素及其受体的关系研究

试验研究了百草枯引起胎鼠动脉管收缩与肾上腺皮质激素及其受体的关系。结果表明:百草枯对未切除肾上腺的孕鼠胎儿动脉管具有明显的收缩作用,试验组与对照组比较差异显著(P<0.05);百草枯促使未切除肾上腺的孕鼠胎儿血浆中肾上腺皮质激素浓度显著升高,试验组与对照组比较差异显著(P<0.05);妊娠20 d和21 d胎鼠动脉管内皮细胞中存在肾上腺皮质激素受体,这说明百草枯引起胎鼠动脉管收缩与肾上腺皮质激素及其受体有关。     

大鼠大脑中动脉栓塞模型的复制与评价

参照Koizumi可逆性阻断模型的制备方法,进行大鼠大脑中动脉栓塞模型的复制和评价。结果证明该法制作的大脑中动脉栓塞模型神经病学症状明显,方法可行,结论可靠,可用此方法复制实验用动物模型。     

为未来投资以维持遗传潜力

<正>由于饲料价格的上涨和/或立法的改变,家禽行业面临着不断增长的成本价格。由于种禽的遗传潜力仍在提高,生产周期能够以一种经济的方式延长,以部分补偿这些较高成本价格所带来的收益损失。对比荷卢经济联盟(Benelux)过去10年的田间数据进行评估后表明,在产蛋量方面取得的遗传进展中,仅50%的蛋有资格作为一级种蛋。由于生产周期不断延长,对维持或改善产蛋高峰后蛋质量的需求将越来越大。     

犬佝偻病的防治

佝偻病是由于维生素D缺乏或钙、磷代谢障碍所致动物的骨营养不良综合征。食物中钙磷不足或者比例失调,或阳光照射不足,维生素D缺乏引起的犬骨组织钙化不全,骨质疏松、变形的疾病称佝偻病:若发生在成年的叫骨软病。1病因食物中钙、磷不足或钙、磷比例失调是导致佝偻病发生的重要原因之一,最理想的钙、磷比例是1.2~1.4:1,并占饲料总量的0.3%。尤其要注意若磷含量过多,易引起钙、磷失调。生、熟肉中含钙较少,若平时饲喂去骨头的鱼或肉,就容     

钙化在CT诊断和鉴别甲状腺结节病变中的价值

目的探讨钙化在CT诊断和鉴别甲状腺结节病变中的价值。方法回顾性分析140例甲状腺结节病例,全部经螺旋CT检查并穿刺活检或手术病理证实(良性病变72例,恶性病变68例)的临床资料。结果 140例甲状腺结节中共检出钙化66例(47.1%),而甲状腺恶性病变中钙化的检出率较甲状腺良性病变的高(61.8%vs 33.3%,P<0.01)。检出钙化的66例甲状腺病变中,微小钙化的检出率为45.5%,而甲状腺恶性病变中微小钙化的检出率较甲状腺良性病变的高(54.8%vs 29.2%,P<0.05)。检出钙化的66例甲状腺病变中,<45岁的有25例,≥45岁的有41例,其在甲状腺良、恶性病变患者中的分布差异有统计学意义(P<0.05)。结论甲状腺CT检查显示钙化提示甲状腺恶性病变,而有微小钙化或为年龄<45岁则高度提示甲状腺恶性病变,应引起重视。     

Making Procedure of Vascular Corrosion Casts of Ovarian Artery in Sheep

In order to explore the making procedure of vascular corrosion casts of ovarian artery in sheep and study the distribution of the blood vessels, this study was carried out and it would provide the foundation of blood vessels anatomy of reproductive system including blood supply mechanism of female ovaries in mammals. Firstly, samples of the uterus and appendages in sheep were collected, and then ovarian arteries and their branches were infused with 8% ABS perfusion agents. After the agent became solid, the samples' soft tissues were corroded away with 30% hydrochloric acid, washed them down with running water and the moderate trim process was done for obtaining the complete vascular corrosion casts of ovarian artery in sheep.The finished casts showed that the ovarian artery in sheep arises three branches including uterine, ovarian and tubal. The ovarian branch showed complicated arrangement such as the spiral artery of ovarian hilus, light spiral piece of ovarian hilus and tight spiral piece of ovarian branch. The results confirmed that the ovarian branch was characterized by the presence of a tight spiral configuration in sheep, the ovarian arterioles were fasten on ovarian hilus, and there were some dense capillaries which extend to other regions of the ovary followed them. Through this procedure, the vascular distribution of corrosion casts was clear,three-dimensional and with smooth surface. It could provide a reference or model for the study of ovarian blood vessels in mammals.     

哪些头痛需要去医院

人的一生中都会或多或少出现头痛的症状,偶发的头痛一般持续时间短,经过休息和头部按摩后会消失,若有持续不适或者伴随下列一些症状,就应该及时去看医生。一、头痛伴有剧烈的恶心、呕吐这是颅内压增高及脑膜受刺激的表现,多见于肿瘤、脑膜炎、蛛网膜下腔出血、脑出血等。而突发性头痛伴出汗、恶心、呕吐,吐出后头痛缓解者多见于偏头痛发作。二、头痛伴有眩晕提示颅后窝病变,如小脑肿瘤、小脑脑桥角肿瘤、椎基底动脉供血不足、椎     

氯化钙在兽医临床上的应用

氯化钙为无色的澄明液体,因具有促进骨骼和牙齿钙化形成,维持骨骼正常的结构和功能,维持神经纤维和肌肉的正常兴奋性,参与神经递质的正常释放,对抗镁离子的中枢抑制及神经肌肉兴奋传导阻滞作用,降低毛细血管膜的通透性,促进凝血和消炎、抗过敏等多重功效,所以成为兽医临床上的常用药物。但是,许多兽医对本品的应用仍存在着诸多误