Histology of Palate and Soft Palate Tonsil of Collared Peccary (Tayassu tajacu)     

T. S. Teófilo  M. R. P. T. Morais  G. F. Dias  A. N. Diniz  H. S. A. Chaves  J. D. Fontenele‐Neto 《Anatomia, histologia, embryologia》2014,43(5):361-368

Peccaries are characterized by a prominent skin gland, known as scent gland, which is located in the middle of the rump. These animals are able to survive in a great variety of habitats, from humid tropical forests to semi‐arid areas. They are omnivorous animals, and their diet includes fibrous material, vegetables, fruits, small vertebrates and insects. Collared peccary hard palate and soft palate tonsils were studied, macroscopic morphometric data were collected and tissue samples were paraffin‐embedded. Sections were stained with HE, Gomori′s trichrome and von Kossa; the first two were used to study general organization and the latter to detect calcium deposits. The hard palate showed one incisive papilla followed by several rugae united by a distinct raphe. The hard palate is lined by a keratinised squamous epithelium resting on a dense connective, whereas in the soft palate, the epithelium is parakeratinised and showed lymphocyte infiltration. The palate showed several pacinian corpuscles in the propria‐submucosa. Two ovoid‐shaped tonsils were found in the soft palate, and several crypts were observed on its surface. The epithelium was highly infiltrated by lymphocytes, and within the crypts, tonsilloliths were frequently observed. The study showed that the general organization of collared peccary palate is similar to other species, but in its oropharynx, only the soft palate tonsil was present and the pacinian corpuscles formed small aggregates.  相似文献   

Immunogenicity of a Recombinant Mycobacterium smegmatis Vaccine Expressing the Fusion Protein CMX in Cattle from Goiás State, Brazil     

Duanne ALVES DA SILVA  Marcos Ant?nio Rocha CAVALCANTI  Fábio MUNIZ DE OLIVEIRA  Monalisa Martins TRENTINI  Ana Paula JUNQUEIRA-KIPNIS  André KIPNIS 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2014,76(7):977-984

  相似文献   

兔皮肤病原真菌的分离及其ITS序列的分析鉴定     

李明勇  牟特  刘曼  王召朋 《中国养兔杂志》2014,(6):11-14

【目的】分离发病兔场皮肤真菌病的病原,并对其ITS序列进行分析鉴定。【方法】采集病兔患病部位的皮屑、结痂进行培养,并根据形态学的特点进行鉴定;然后采用真菌ITS区通用引物对其ITS区进行PCR扩增测序,并将其ITS区序列与Gen Bank中的核酸数据库进行比对分析,确定病原真菌的生物学分类,最后对其亲缘关系进行系统发育分析。【结果】分离得到的病原真菌经形态学初步鉴定为小孢子菌属;序列比对和系统发育分析表明,该菌与Microsporum gypseum strain WCH-MG001(序列号:GU348990.1)的ITS序列具有99%的同源性,在系统发育树上也属于同一分支,从而确定该菌为石膏样小孢子菌。  相似文献   

The use of microsatellite markers to determine the relative proportions of grain produced by cultivars and the frequency of hybridization in bread wheat mixtures     

M. Belhaj  Fraj  H. Falentin-Guyomarc'h  H. Monod  C. DE Vallavieille-Pope  W. E. Weber 《Plant Breeding》2003,122(5):385-391

Two polymorphic microsatellite markers were selected to identify 24 bread wheat cultivars commonly grown in France and to estimate the proportions of cultivar and hybrid grains in the harvests of four 4‐cultivar mixtures (CM 1‐4) planted in equal proportions in farmers’ fields. This technology was used not only to determine whether a mixture comprises the declared cultivars, but also whether there is any contamination with other cultivars, to identify the contaminants and to estimate their proportions. At harvest, the cultivar proportions ranged from 15 to 37%. Only in the mixture CM2 (‘Malacca’, ‘Somme’, ‘Renan’ and ‘Soissons’), did the cultivars contribute equally to the harvest. The other cultivar mixtures CM1 (‘Malacca’, ‘Somme’, ‘Renan’ and ‘Camp Remy’), CM3 (‘Malacca’, ‘Texel’, ‘Apache’ and ‘Aligre’) and CM4 (‘Malacca’, ‘Somme’, ‘Apache’ and ‘Virtuose’) showed significantly unequal cultivar proportions with ‘Somme’ dominating ‘Renan’ and ‘Camp Remy’ in CM1, and ‘Apache’ dominating ‘Malacca’ and ‘Aligre’ in CM3 and ‘Malacca’ in CM4. Similar cultivar proportions were measured with gliadin and glutenin markers in the mixtures CM3 and CM4, confirming the results with microsatellites. No contamination was found. Hybrids accounted for between 1.3 and 6.3% of the grains produced in the four cultivar mixtures.  相似文献   

Random amplified polymorphic DNA variation within and among meadow bromegrass progeny types   总被引：1，自引：0，他引：1  

M. R. A. DE  Araújo  B. Coulman    D. Somers  Y. Ferdinandez  G. Rakow 《Plant Breeding》2003,122(5):416-420

Ten meadow bromegrass genotypes tested as half‐sib (polycross, PX; open‐pollinated, OP) and selfed (S₁) progenies were surveyed using random amplified polymorphic DNA. Fourteen primers, which produced 32 markers, were selected to determine the genotypes of 360 individuals from the three progeny tests. Analysis of molecular variance was performed in each progeny test, and genetic distances between genotypes and progeny types were determined. Among genotype genetic variation in half‐sib (PX and OP) progenies was similar. Genetic variation among genotypes for S₁ progenies (30.5%) was about twice that found in the half‐sib progenies. Variation between individual S₁ progenies ranged from 15.7% to 50.1%, while in the half‐sib progenies, the range was 6.9‐24.1%. Based on average distances between progeny types for a given genotype, OP and PX were closer to each other than to the S₁. An analysis of variance of the molecular marker frequency occurrence was performed for 12 plants within each progeny type of each genotype. Marker frequencies, expressed in percentages, ranged from 10.7% to 84.3%. No significant differences were found for genotype and progeny type‐genotype interaction suggesting that all genotypes behave in a similar manner across the different progeny types.  相似文献   

Further cytological characteristics of a male-sterile mutant in soybean affecting cytokinesis and microspore development     

N. C. P. Bione    M. S. Pagliarini  L. Alves DE  Almeida R. Röbbelen 《Plant Breeding》2003,122(3):244-247

A spontaneous male‐sterile mutation affecting microspore development has been found in BR97‐13509H line of the official Brazilian soybean breeding programme. Slightly abnormal and irregular chromosome segregation occurred in both meiotic divisions, albeit insufficient to explain total pollen sterility. The main cause of male sterility was the absence of cytokinesis after telophase II. Instead of the typical tetrads of microspores, four‐nucleate coenocytic microspores were formed. Coenocytic microspores resulting from the absence of cytokinesis have also been described in ms1 and ms4 male‐sterile soybean mutants, although with certain differential characteristics. In the BR97‐13509H mutant line, after interphase the four nuclei were rejoined in one or two metaphase plates and progressed through the first pollen mitosis. Pollen then underwent a progressive process of degeneration characterized by continuous cytoplasmic shrinkage. The second pollen mitosis failed to occur, and pollen sterility became total.  相似文献   

南美牛鹂宿主的反寄生防御行为(英文)     

Juan Carlos REBOREDA  Vanina D.FIORINI  María C.DE MRSICO 《中国鸟类》2013,4(1):57-70

牛鹂(Molothrus属,拟鹂科)是一个单起源的类群,包括现存的5种寄生性繁殖鸟类。啸声牛鹂(M.rufoaxillaris)、巨牛鹂(M.oryzivorus)和紫辉牛鹂(M.bonariensis)主要分布在南美。其中,啸声牛鹂与紫辉牛鹂分别代表较古老和最近进化的两个支系,因此有着各自不同的与宿主协同进化的历史。本文研究了紫辉牛鹂的宿主莺鹪鹩(Troglodytes aedon)的拒卵行为,同时综述了以上3种牛鹂的不同宿主的反寄生防御行为。3种牛鹂的宿主均能识别和拒绝非模拟的寄生卵,其中巨牛鹂和紫辉牛鹂的大部分宿主用嘴叼卵,而啸声牛鹂的主要宿主栗翅牛鹂(Agelaioides badius)则用脚扔掉寄生卵。比紫辉牛鹂小的宿主,在遭遇寄生时则不扔卵,也不弃巢。有些宿主比另一些宿主种类对寄生的牛鹂更具有攻击行为。啸声牛鹂的宿主还能够识别非模拟的寄生雏鸟。我们的结果说明,尽管与牛鹂协同进化的历史不同,大部分牛鹂的宿主已经进化出不同类型的反寄生防御对策。  相似文献   

Toxoplasmosis in sheep III. Further evaluation of the ability of a live Toxoplasma gondii vaccine to prevent lamb losses and reduce congenital infection following experimental oral challenge     

M.F. Wilkins  Elaine O'Connell  W.A. Te Punga 《New Zealand veterinary journal》2013,61(2):86-89

The aim of this study was to compare the ability of a live incomplete strain (Strain 48) and a live complete strain (Strain 89) of Toxoplasma gondii to protect against abortion and congenital infection following an oral challenge of T. gondii oocysts. Sixty-nine two-tooth ewes were immunised pre-tupping with live Strain 48 of T. gondii tachyzoites and seventy ewes were immunised with Strain 89. Eighty-two serologically negative ewes served as controls. At mid-pregnancy half of the ewes were challenged orally with T. gondii oocysts (2×10⁵/ewe).

The ewes vaccinated with Strain 48 were significantly (p<0.05) protected against the effects of experimental challenge and the rate of congenital infection was also significantly (p<0.15) reduced. The ewes vaccinated with Strain 89 were also significantly (p<0.05) protected.

The serological response to challenge as measured by both the Dye test and the Indirect Haemagglutination test varied considerably between the two vaccinated groups.  相似文献   

Model-Based Integrated Methods for Quantitative Estimation of Soil Salinity from Hyperspectral Remote Sensing Data:A Case Study of Seffected South African Soils   总被引：1，自引：0，他引：1  

Z. E. MASHIMBYE  M. A. CHO  J. P. NELL  W. P. DE CLERCQ  A. VAN NIEKERK  D. P. TURNER 《土壤圈》2012,22(5):640-649

Soil salinization is a land degradation process that leads to reduced agricultural yields. This study investigated the method that can best predict electrical conductivity (EC) in dry soils using individual bands, a normalized difference salinity index (NDSI), partial least squares regression (PLSR), and bagging PLSR. Soil spectral reflectance of dried, ground, and sieved soil samples containing varying amounts of EC was measured using an ASD FieldSpec spectrometer in a darkroom. Predictive models were computed using a training dataset. An independent validation dataset was used to validate the models. The results showed that good predictions could be made based on bagging PLSR using first derivative reflectance (validation R2 = 0.85), PLSR using untransformed reflectance (validation R2 = 0.70), NDSI (validation R2 = 0.65), and the untransformed individual band at 2257 nm (validation R2 = 0.60) predictive models. These suggested the potential of mapping soil salinity using airborne and/or satellite hyperspectral data during dry seasons.  相似文献   

Elimination of two reef-building hydrocorals following the 1982-83 el nino warming event     

Glynn PW  DE Weerdt WH 《Science (New York, N.Y.)》1991,253(5015):69-71

One probable extinction and one range reduction of eastern Pacific reef-building hydrocoral (Millepora) species mark the first documented cases of species eliminations resulting from the worldwide 1980s coral reef bleaching events. Two of 12 Panamanian coral species were eliminated suddenly from their former ranges by prolonged high sea temperatures during the 1982-83 El Ni?o-Southern Oscillation event. Three conditions contributed to their demise: high sensitivity to sea warming, populations confined to a small geographic area, and bathymetric restriction to the euphotic zone (相似文献