紫外分光光度法测定伊维菌素预混剂的含量

伊维菌素溶于甲醇，而辅料不溶，过滤分离出伊维菌素，于200－400nm间扫描，在238nm、245nm波长处有最大吸收峰。以245nm作检测波长，伊维菌素在4-28μg/ml范围内与吸收度呈良好线性关系。用伊维菌素作对照品测得伊维菌素预混剂的平均回收率为99.94%，RSD＝0.24%，n=5。紫外分光光度法具有快速、准确、易操作等优点，该方法对市场快速检测，生产厂家质量监控具有实用价值。     

紫光分光度法测定伊维菌素预混剂的含量

伊维菌素溶于甲醇,而辅料不溶,过滤分离出伊维菌素,于200～400nm间扫描,在238nm、245nm波长处有最大吸收峰.以245nm作检测波长,伊维菌素在4～28μg/ml范围内与吸收度呈良好线性关系.用伊维菌素作对照品测得伊维菌素预混剂的平均回收率为99.94%,RSD=0.24%,n=5.紫外分光光度法具有快速、准确、易操作等优点,该方法对市场快速检测,生产厂家质量监控具有实用价值.     

紫外分光光度法快速测定伊菌素注射液的含量

采用紫外分光光度法测定伊维菌素注射液的含量，于220－360nm间扫描，在238nm、245nm波长处有最大吸收峰。实验结果表明，在波长为245nm处，伊维菌素在4－28μg/mL范围内呈良好的线性关系。本法的回收率为100.1%，RSD为0.30%，n=5。本法具有简便、快速、易操作等优点，对市场快速检测及生产厂家质量监控具有实用价值。     

伊维菌素注射液含量的测定法

用紫外分光光度法测定伊维菌注射液中伊维菌素B1的含量。伊维菌素注射液溶于甲醇,于200~400nm间扫描,在238nm、245nm波长处有最大吸收峰,245nm波长处测定吸伊维菌素作对照品测得伊维菌素注射液的平均回收率为100.06%,RSD为0.24%(n=5),与《中国兽药典》规定方法比较,结果基本一致,且具有快速、准确、易操作等优点。     

紫外分光光度法测定伊维菌注射液中伊维菌素B1的含量

为用紫外分光光度法测定伊维菌注射液中伊维菌素B1的含量,将伊维菌素注射液溶于甲醇,于200～400nm间扫描,在238nm和245nm波长处有最大吸收峰,245nm波长处测定伊维菌素对照品,测得伊维菌素注射液的平均回收率为100.06%,RSD为0.24%(n=5),与《中国兽药典》规定方法比较,结果基本一致,且具有快速、准确、易操作等优点。该方法对市场快速检测及生产厂家质量监控具有实用价值。     

复方伊维菌素片含量测定方法的探讨

采用HPLC法及紫外-可见分光光度法分别测定复方伊维菌素片中伊维菌素及阿苯达唑的含量，以控制该制剂的质量。用十八烷基键合硅胶柱分离伊维菌素，以甲醇-水(85：15)为流动相，检测波长245nm；用紫外-可见分光光度法在295nm波长处测定阿苯达唑的含量。结果表明，用HPLC法测定本品中伊维菌素的含量时，伊维菌素能与阿苯达唑完全分离，平均回收率为99．56％，RSD=1．27(n=5)；用紫外-可见分光光度法测定本品中阿苯达唑的含量，伊维菌素对测定无干扰，平均回收率为99．14％，RSD=0．48(n：4)。本法简便、快速，可用于该产品的质量控制。     

紫外分光光度法测定伊维菌素片的含量

用紫外分光光度法测定伊维菌素片中伊维菌素B1的含量。伊维菌素溶于甲醇 ,而辅料不溶 ,过滤分离出伊维菌素 ,于 2 0 0～ 4 0 0nm间扫描 ,在 2 38nm、2 4 5nm波长处有最大吸收峰。以2 4 5nm作检测波长 ,伊维菌素在 4～ 2 8μg /ml范围内与吸收度呈良好线性关系。用伊维菌素作对照品测得伊维菌素片的平均回收率为 10 0 13% ,RSD为 0 2 5 % ,n =5。紫外分光光度法具有快速、准确、易操作等优点。该方法对市场快速检测及生产厂家质量监控具有实用价值。     

紫外分光光度法快速测定伊维菌素注射液的含量

采用紫外分光光度法测定伊维菌素注射液的含量,于220～360 nm间扫描,在238 nm、245 nm波长处有最大吸收峰.实验结果表明,在波长为245 nm处,伊维菌素在4～28μg/mL范围内呈良好的线性关系.本法的回收率为100.1%,RSD为0.30%,n=5.本法具有简便、快速、易操作等优点,对市场快速检测及生产厂家质量监控具有实用价值.     

HPLC法测定微乳中伊维菌素的含量

建立了HPLC测定伊维菌素微乳中伊维菌素含量的方法。色谱柱为ZirchromC18(4.6mm×250 mm,5μm),流动相为甲醇∶水(85∶15),测定波长为245 nm,流速为1.0 mL/min,柱温为40℃。伊维菌素与辅料及溶剂峰分离良好,在2.22~111.0μg/mL时线性关系良好(R2=0.999 9)。HPLC测定伊维菌素方法便捷、准确、重复性好,可用于伊维菌素微乳含量的测定。     

复方伊维菌素注射液对绵羊消化道线虫驱除效果的试验

复方伊维菌素注射液是以伊维菌素加氯氰碘柳胺钠组成的复方抗寄生虫注射液。伊维菌素是强力、广谱的驱肠道线虫和杀灭体外寄生虫的药物。氯氰碘柳胺钠是一种柳胺类广谱驱虫药物，具有用量小、体内半衰期长、安全性高、毒副作用低等特点，它对动物体内线虫和吸虫具有高效驱杀作用，并对疥螨、皮蝇、鼻蝇等体外寄生虫治疗效果确实。     

中国饲料工业协会第五届理事会顾问、会长、常务副会长、副会长、秘书长、副秘书长、常务理事、理事名单

顾问刘中一张德邻宋瑞祥聂振邦张子仪戎易王维四会长白美清国务院原副秘书长、第四届理事会会长常务副会长(8人,以姓氏笔划为序)刘永好新希望集团董事长、第四届理事会副会长刘汉元通威股份有限公司董事长、第四届理事会副会长陈丹广东恒兴集团股份有限公司董事长、第四届理事会副会长张延喜农业部原副部长、第四届理事会副会长吴明夏湖南正虹科技发展股份有限公司董事长、第四届理事会副会长陶一山唐人神集团股份有限公司董事长、第四届理事会副会长温鹏程广东温氏食品集团有限公司董事长、第四届理事会副会长谭竹洲原化学工业部副部长、第…     

Evidence for the non-involvement of the uterus in the lifespan of the corpus luteum in the cyclic dog

Progesterone levels in peripheral blood of dogs were analysed during the cycle in which hysterectomy (n = 5) or sham surgery (n = 3) was performed as well as during the cycle of dogs (n = 5) hysterectomized at least one year prior to this study; the data were compared with the findings in control dogs (n = 3). The averages of the duration of the luteal period observed in the three experimental groups were not significantly different from those of control dogs. Immediately after surgery, the progesterone level decreased from 25 to 50% of the presurgical level, but returned to presurgical level in about four days. Prolactin levels were elevated for about 30 h after surgery. Nevertheless, the averages of the mean prolactin levels for each animal during the luteal period of the experimental groups were not significantly different from those of control dogs. It is concluded that in the dog, the uterus is not involved in the lifespan of the cyclic corpus luteum.     

浅谈对症用药

对症用药就是通过对患病信鸽的症状进行诊断,进而确定病属,选择药物及如何用药的方法。     

The influence of the width of the saddle tree on the forces and the pressure distribution under the saddle

As there is no statistical evidence that saddle fit influences the load exerted on a horse's back, this study was performed to assess the hypothesis that the width of the tree significantly alters the pressure distribution on the back beneath the saddle. Nineteen sound horses were ridden at walk and trot on a treadmill with three saddles differing only in tree width. Kinetic data were recorded by a sensor mat. A minimum of 14 motion cycles were used in each trial. The saddles were classified into four groups depending on fit. For each horse, the saddle with the lowest overall force (LOF) was determined. Saddles were classified as "too-narrow" if they were one size (2 cm) narrower than the LOF saddle, and "too-wide" if they were one size (2 cm) wider than the LOF saddle. Saddles two sizes wider than LOF saddles were classified as "very-wide". In the group of narrow saddles, the pressure in the caudal third (walk 0.63 N/cm(2)+/-0.10; trot 1.08 N/cm(2)+/-0.26) was significantly higher compared to the LOF saddles (walk 0.50 N/cm(2)+/-0.09; trot 0.86 N/cm(2)+/-0.28). In the middle transversal third, the pressure of the wide saddles (walk 0.73 N/cm(2)+/-0.06; trot 1.52 N/cm(2)+/-0.19) and very-wide saddles (walk 0.77 N/cm(2)+/-0.06; trot 1.57 N/cm(2)+/-0.19) was significantly higher compared to LOF saddles (walk 0.65 N/cm(2)+/-0.10/ 0.63 N/cm(2)+/-0.11; trot 1.33 N/cm(2)+/-0.22/1.27 N/cm(2)+/-0.20). This study demonstrates that the load under poorly fitting saddles is distributed over a smaller area than under properly fitting saddles, leading to potentially harmful pressures peaks.     

军犬鉴别中的嗅源培养和易出现的问题及对策

嗅源是军犬嗅觉作业训练的依据.军犬鉴别中嗅源能力的培养在整个鉴别训练中占有重要地位,关系到鉴别训练的成败和鉴别能力的提高.所以,军犬在嗅认嗅源时必须按照训犬员的指令充分、细致地感受嗅源气味,并且对嗅源气味产生兴奋反应.如何培养军犬充分嗅认嗅源以及及时解决嗅认过程中出现的问题,成为我们进行鉴别训练的关键.……     

Observations on the Pathology of the Spleen of the Cat

Abstract— Lesions were found in the spleen of four of sixty-three cats examined post mortem in the department, and comprised two examples of lymphosarcoma, one of chronic fibrinous peritonitis and one of subcapsular haematoma. Abnormalities were found in two cat spleens received from veterinary surgeons in general practice. In one cat the abnormalities were an haemangiosarcoma with secondary deposits in the liver and in the other extensive mast cell infiltration. In addition lesions were detected in the spleen of three of eighty-seven cats examined post mortem in general practice. The lesions were: multiple secondary deposits of adenocarcinoma from a primary tumour of the mammary gland, a ruptured spleen and a foreign body below the splenic capsule. Résumé— L'examen microscopique de soixante-trois chats pratiqué dans le service a permis de rencontrer quatre fois des lésions de la rate, dont deux lymphosarcomes, une péritonite capsulaire fibrineuse et un hématome sous-capsulaire. D'autre part des lésions ont été trouvées dans deux rates de chat expédiées par des vétérinaires exerçant en pratiaue générale. Chez un chat il s'agissait d'un htmangiosarcome avec métastases hépatiques et chex l'autre d'une infilt ation diffuse par des mastocyta. De plus, on a rencontré des llésions dnas la rate de trois chats parmi quatre-vingt sept autopsies effectuées dans le cadre d'une clientèle génárale. Ces iésions étaient dés métastases multiples d'un adénocarcinome dont la tumeur primitive siègeait dam la glande mammaire, une rupture de la rate et un corps érangers sou capsulaire. Zusammenfassung— Läsionen der Milz wurden bei vier von dreiuiidsechzig in dieser hbteilung sezierten Katzen gefunden, und zwar in zwei Fällen ein Lymphosarkom, in einem Falle eine chron-ische fibrinöse Peritonitis und in einem ein subkapsuläres Hématom. Anomalien fanden sich auch in der Milz von zwei Katzen, die aus der tierxrztlichen Praxis eingesandt wurden. Bei der einen Katze war dies ein Hämangiosarkom mit Metastasen in der Leber, bei der anderen eine weitläufige Infiltration der Mastzellen. Außerdem wurden bei drei von siebenundachtzig in der Praxis sezierten Katzen Milzläsionen gefunden. Diese bestanden am multiplen Metastasen eines Adenokarzinoms der Brustdrüse, einer Milzzerreissung und einem Fremdkörper unterhalb der Milzkapsel.