草莓果实的流变特牲及其在贮藏过程中的变化规律

利用自制的应力－应变试验台，对草莓果实的应力－应变特性和蠕变特性进行了测定与研究，建立了草莓果实应力－应变的数学模型，指出了草莓果实的极限屈服点变动范围。同时对草莓在不同贮藏条件下流变特性的变化规律进行了初步的研究，发现草莓的成熟度、贮藏温度及贮藏时间对果实的硬度、屈服应力均有较显著的影响，建立了屈服应力随时间变化的不同阶段的回归方程，可用于预测在相应贮藏条件下的草莓果实的屈服应力。     

Chronic partial obstructive urolithiasis causing hydronephrosis and chronic renal failure in a steer.

A 13-month-old Angus steer was examined with a 6-week history of lethargy, malaise and dribbling urine. Laboratory exam revealed crystalluria and poor renal function. Ultrasound revealed hydronephrosis and hydroureter. Euthanasia was chosen because of a poor prognosis for economic recovery. Necropsy demonstrated numerous calculi causing partial urethral obstruction approximately 25 cm from the end of the penis. Secondary renal changes were confirmed. Urolithiasis occurs commonly in ruminants. Secondary obstruction is usually complete with severe consequences. This is the first report of chronic partial obstructive urolithiasis resulting in endstage renal disease.     

Radiological assessment of 50 cases of incisive or maxillary neoplasia in the dog

This paper reviews the radiological features of 50 canine incisive or maxillary tumours and discusses the value of radiological assessment in the diagnosis and staging of these tumours. The 50 tumours examined included 21 sarcomas, 15 carcinomas, three melanomas and an assortment of benign tumours of the oral cavity. There was not any site specificity for the different histological tumour types within the upper dental arcade, although fibrosarcomas had a tendency to be maxillary whereas the squamous cell carcinomas were equally distributed between the incisive and maxillary regions. Seventy-eight per cent of fibrosarcomas, 82 per cent of squamous cell carcinoma and all three melanomas examined showed radiological evidence of bone involvement. Radiographic changes were also seen in the benign tumours. The pattern of growth of tumours correlated with the radiological changes observed. Malignant tumours showed a tendency to irregular or aggressive bone loss whereas bone production predominated in the benign tumours.     

Fractionation of cock spermatozoa

An account is given of the methodology for fractionation of cock spermatozoa into head and tail fractions by ultrasonication, followed by sucrose density gradient centrifugation. Quantitative estimates of DNA attested to 89.4% purity of the head fraction and low contamination of tails with heads. Recovery of protein and malic dehydrogenase (MDH) activity, following sperm fractionation, averaged 94.3% and 95.7%, respectively. Contamination of the head fraction with tails, as assessed by MDH assay, was only 4.65%, and the purity of the tail fraction was 91%. Intensive succinic dehydrogenase (SDH) activity was histochemically localised in the separated tail fraction and in the tail portion of intact spermatozoa. However, SDH activity was discernible neither in the head fraction nor in the head of intact spermatozoa.     

Effect of xylazine on cerebrospinal fluid pressure in conscious horses.

Lumbosacral CSF pressure was measured in 6 horses via a catheter inserted through the lumbosacral space. Heart rate, facial artery pressure, central venous pressure, and CSF pressure were measured before IV injection of a saline solution control, for 15 minutes after saline solution injection, and for 60 minutes after the IV injection of 1.1 mg of xylazine/kg of body weight. Arterial pH and blood gases were analyzed before saline solution injection, 15 minutes after saline solution injection, and at 15, 30, and 60 minutes after xylazine injection. Constant craniocervical posture was maintained during sedation. Lumbosacral CSF pressure was significantly decreased for 15 minutes after xylazine injection. Diastolic arterial pressure was significantly increased 4 minutes after xylazine administration and diastolic and mean arterial pressure were increased at 6 and 8 minutes after xylazine administration. Small increases in systolic arterial blood pressure and central venous pressure, and a small decrease in heart rate were observed. There were no significant differences in the arterial blood gas values. It was concluded that IV injection of xylazine causes a decrease in intracranial pressure in healthy conscious horses. The effects may be different in horses with neurologic disease or cerebral trauma.     

Effect of dietary protein content on episodic growth hormone secretion and on heat production of male broiler chickens.

1. The effect of the crude protein content (200 and 150 g/kg) of isoenergetic diets on episodic growth hormone (GH) release and on heat production was investigated in male broiler chickens. 2. Decreasing the crude protein content of isoenergetic diets from 200 g/kg (HP diet) to 150 g/kg (LP diet) resulted in depressed body weight gain, impaired food conversion efficiency and increased abdominal fat deposition. 3. The pattern of growth hormone secretion was markedly affected by dietary treatment. Broiler chickens fed on the LP diet had higher overall mean, amplitude, baseline and peak frequency than the HP chickens. 4. The LP chickens produced more heat per unit of metabolic body weight than the HP chickens. 5. The hypothesis relating the pattern of GH secretion to protein conversion efficiency was corroborated.     

Plant interference and chemical toxins in upland pastures

Supernatants derived from desiccated plant material gathered from Agrostis/Festuca vegetation had an inhibitory effect on the germination and early development of seedlings of Trifolium repens cv. S184. Two compounds, o -hydroxyphenylpropionic acid and benzoic acid, were identified chromatographically and their structures confirmed by mass spectrometry. Commercial preparations of the two compounds were effective inhibitors at a concentration of 10⁻² and 10⁻³ m respectively when T. repens was used as the phytometer species. Benzoic acid lost its inhibitory effect when the pH of the two solutions was adjusted to pH 5·5. The roots of seedlings of white clover were severely distorted by o -hydroxyphenylpropionic add at 10⁻³ m . It is likely that phenolic acids, produced from the surface trash created by slot seeding procedures, interfere with the establishment of white clover in upland pastures.     

Progressive Dermal Collagenosis of Male Miniature Swine

Abstract— A unique dermatosis of male miniature swine is described. The disease occurs in post-pubertal pigs, and is characterized by symmetrical, indurated, plaques over the truncal region. Histologically, the dermis and panniculus are effaced by thick, interwoven bundles of collagen resulting in an absence of deep dermal elastin. Hypertrophy and hyperplasia of superficial dermal vessels, fibroblasts and fibrocytes are accompanied by perivascular infiltrates of lymphocytes, plasma cells and eosinophils. The pathogenesis of this unusual dermatosis, designated as “progressive dermal collagenosis of male miniature swine” is unknown. Résumé— Une dermatose originale du cochon nain mâle est décrite. La maladie apparait chez des cochons post pubertaires, et est caractérisée par des plaques sur le tronc, indurées et symétriques. Histologliquement, le derme et le pannicule sont envahis par d‘épais falsceaux de collagène, entrainant l'absence d’élastine dermique. Les vaisseaux du derme superficiei sont hyperplasiés et hypertrophiés, des fibroblastes et des fibrocytes sont accompagnés d'un infiltrat inflammatoire périvasculaire de lymphocytes, éosinophiles et plasmocytes. La pathogénie de cette affection peu commune, appelée “collagénose dermique progressive du cochon nain mâle” est inconnue. Zusammenfassung— Es wird eine einzigartige Hauterkrankung beim männlichen Miniaturschwein beschrieben. Die Krankheit tritt bei postpubertären Schweinen auf und wird durch symmetrische, indurierte Plagues im Rumpfbereich gekennzeichnet. Histologisch treten Dermis und Pannikulus gegenüber dicken, verflochtenen Kollagenbündeln in den Hintergrund, wodurch das tiefe, dermale Elastin verschwindet. Die Hypertrophie und Hyperplasie der oberflächlichen Hautgefäße, Fibroblasten und Fibrozyten wird von perivaskulären Infiltraten aus Lymphozyten, Plasmazellen und eosinophilen Granulozyten begleitet. Die Pathogenese dieser ungewöhnlichen Dermatose, die als “progressive dermale Kollagenose des männlichen Miniaturschweins” bezeichnet wird, ist unbekannt. Resumen El presente artículo es una descripción de una dermatosis única del macho cerdo miniatura. Le enfermedad aparece después de la pubertad, y se caracteriza por la aparición de placas simétricas sobre la región del tronco. El exámen histológico de la dermis y del tejido panicular revela la presencia de gruesas bandas de colágeno entrelazadas, lo cual tiene como resultado la ausencia de la capa de elastina profunda. La hipertrofia e hiperplasia de los vasos superficiales dérmicos, fibroblastos y fibrocitos, se ve acompañadas de infiltrados perivasculares de linfocitos, células plasmáticas y eosinófilos. La patogénesis de esta rara dermatosis Ilamada ‘colagenosis dérmica progresiva del cardo macho miniatura’, es desconocida.     

马鹿假台鹿采精技术的研究

对６头试验公鹿用假台鹿采精，采精前对特制的假阴道以药用凡士林为滑润剂，注水充气，温度为４０℃±１℃，以适宜的压力和滑润度，将其安装在人工制做的假台鹿内。拨赶公鹿于采精场诱其爬跨。结果，试验的６头公鹿中有４头能够采精，共２２头次，射精量平均每头次１．５４ｍｌ，精子密度为１８．６—３７亿／ｍｌ，精子活力在０．８以上。９３年每头次生产细管冻精１０６．２５支（４２５支／４头次），是同年电刺激采精法平均６４．４支／头次（９０２支／１４头次）的１．６５倍，此法既能采到质量高的精液，又比电采法省工、省时、省力、安全，是一种理想的马鹿采精方法。