核桃绿枝嫁接技术     

吴冉  冯海宝  张德可  蔡斌  辛乐  何晓波 《现代农业科技》2014,(19)

从适期嫁接、选择适宜砧木及穗、科学操作等3个方面总结了核桃绿枝嫁接技术,以期促进当地核桃产业的发展。  相似文献   

Using ecological trajectories to track long-term taxonomic and functional changes in benthic shallow soft-bottom communities (Bay of Saint-Brieuc,English Channel)     

Anthony Sturbois  Gaëtan Cormy  Alexandre Le Moal  Gauthier Schaal  Caroline Broudin  Eric Thiébaut  Alain Ponsero  Patrick Le Mao  Auriane Jones  Pascal Riera  Olivier Gauthier  Nicolas Desroy 《水产资源保护:海洋与淡水生态系统》2021,31(11):3013-3033

1. Taxonomic and functional trajectories of benthic assemblages were studied in shallow soft-bottom sediments in the bay of Saint-Brieuc (Western English Channel). Changes were assessed at different spatial and temporal scales using a macrobenthic dataset based on 38 stations sampled in 1987 and 2019, coupled with data from one station sampled annually between 2005 and 2019 as part of the European Water Framework Directive monitoring programme.
2. Taxonomic trajectories indicated 1) changes in the structure and distribution of benthic assemblages, 2) an homogenization of the assemblages, and 3) significant functional shifts.
3. Fishing activities and nutrient enrichment are probably strong drivers of the observed changes, as suggested by the higher mortality rate of fragile, flexible, tubiculous and burrowing species, and the increase in the abundance of opportunistic species in the assemblages. Certain populations of macroinvertebrates seem jointly controlled by climate change and by the aforementioned local factors of disturbance.
4. The Community Trajectory Analysis framework appears as a new and interesting method to track ecological changes in marine ecosystems by measuring change with respect to a baseline state, to help define ecological recovery (station returning to the initial ecological state) and departure (station presenting increased changes over time), and to analyse trajectory similarity.
5. According to the degradation of habitat over time, we identify the need for the implementation of knowledge-based conservation strategies, especially within Natura 2000 sites.

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Growth hormone (GH) and reproduction: a review   总被引：5，自引：0，他引：5  

Florence Le Gac  Odile Blaise  Alex Fostier  Pierre-Yves Le Bail  Maurice Loir  Brigitte Mourot  Claudine Weil 《Fish physiology and biochemistry》1993,11(1-6):219-232

Interaction between growth and reproduction occurs in many vertebrates and is particularly obvious at certain stages of the life cycle in fish. Endocrine interactions between the gonadotropic axis and the somatotropic axis are described, the potential role of GH being emphasised. A comparative analysis of these phenomena in mammals, amphibians and fish, suggests a specific role of GH in the physiology of puberty, gametogenesis and fertility. It also shows the original contribution made by studies on the fish model in this field of investigations.  相似文献   

Ciguatoxin in moray eels raising the risk for seafood safety in Viet Nam     

Dao  Ha Viet  Le  Hy Ho Khanh  Le  Thao Thi Thu  Pham  Ky Xuan  Bui  Minh Quang  Chan  Leo Lai 《Fisheries Science》2022,88(6):821-830

Fisheries Science - Recently, suspected ciguatera fish poisoning (CFP) cases caused by the consumption of moray eels, popular seafood for locals and tourists, have been reported in Viet Nam....  相似文献   

油酸对鹅原代肝细胞三酰甘油含量及TNFα和PPA Rα表达的影响     

李乐  潘志雄  韩春春  吕佳  林加勇  李亮  王继文 《农业生物技术学报》2010,18(2):318-322

以四川白鹅(Anser cygnoides)原代培养肝细胞为模型,测定了油酸对鹅肝细胞活性、三酰甘油(TG)含量、脂滴形成的影响,同时研究了油酸对肿瘤坏死因子α(TNFα)和过氧化酶体增殖物激活受体α基因(PPARα)表达的作用.结果表明,0.5 mmol/L的油酸能增强肝细胞活性,而1.5 mmol/L油酸对肝细胞活性有抑制作用.添加不同浓度油酸都能诱导鹅肝细胞TG含量和脂滴增多,其中1.0 mmol/L的油酸作用最明显.0.5 mmol/L、1.0 mmol/L和1.5 mmol/L油酸都能提高PPARα mRNA水平;而0.5 mmol/L和1.0 mmol/L油酸均能提高TNFα基因表达,但1.5 mmol/L油酸对TNFα mRNA水平没有明显影响,表明PPARα和TNFα基因表达水平变化对维持鹅肝细胞内脂质代谢的平衡具有重要作用.  相似文献   

Correlation Analysis on the Fineness and Single Fiber Strength of Alpaca Wool Fiber     

XU Yan-li  HU Xin  XING Wei-ting  ZHANG Min  WANG Le 《中国畜牧兽医》2017,44(10):2980-2986

In this study,321 samples were tested to evaluate the correlation between fineness and single fiber strength of alpaca fiber. The results showed that fineness average of lateral part was 24.30 μm,subject range was from 18.01 to 27.00 μm,accounted for 72% of the total samples;The strength average was 8.31 cN,subject range was from 5.01 to 11.00 cN, accounted for 88% of the total samples, it showed that the overall fineness of alpaca wool fiber was fine,the strength could satisfy the textile technology. The correlation results showed that the fineness of different parts (neck, shoulder, thigh, abdomen, lateral and back) in different groups (sex, age) all reflected that the wool fiber of the back was the finest,the strength was the minimal;And that of abdomen was the thickest,the strength was the maximum. On the other hand, we knew the greater the strength, the fineness was thicker; The smaller the strength, the fineness was finer from the distribution of different fineness range corresponded to the strength. In addition, there was also a positive correlation between them in differernt groups (sex,age),the fineness of adult alpaca was thicker than yearling alpaca, the male alpaca was thicker than female alpaca; The strength of adult alpaca was stronger than yearling alpaca, the male alpaca was stronger than female alpaca. The above results showed that the fineness of alpaca wool fiber was positively correlated with the single fiber strength.  相似文献   

Potential geographical distribution of Ambrosia trifida in Xinjiang under climate change     

Qian-qian MA  Tong LIU  He-gan DONG  Han-yue WANG  Wen-xuan ZHAO  Rui-li WANG  Yan LIU  Le CHEN 《草业学报》2008,29(12):73

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CD34 protein is expressed in murine,canine, and porcine lungs     

Gurpreet K. Aulakh  Sushmita Maltare  Le Nguyen Phuong Khanh  Baljit Singh 《Canadian journal of veterinary research》2021,85(3):161

The cell surface protein CD34 is expressed in various human tissues and cells, including hematopoietic stem cells, vascular endothelial cells, mucosal dendritic cells, mast cells, eosinophils, microglia, fibrocytes, muscle satellite cells, and platelets. There is a lack of data on the expression of CD34 in canine and porcine tissues. Therefore, we designed a series of immunoblotting, immunohistochemistry, and immunofluorescence experiments to observe CD34 expression in murine, canine, and porcine lungs. We used a rabbit antibody (clone EP373Y) to target the conserved human CD34 C-terminal region and validated its immunoreactivity against mouse lung homogenates. The data showed diffuse bronchiolar and alveolar epithelial localization of CD34 protein in normal murine, canine, and porcine lungs. At 9 or 24 h after bacterial endotoxin exposure, murine CD34 protein shifted to specific bronchoalveolar cells with a punctate pattern, as quantified by CD34 fluorescence. Specific porcine bronchoalveolar cells and leukocytes had significant CD34-positive immunostaining after H3N1 influenza infection. Thus, our study provides fundamental data on the expression of CD34 in lungs and validates an antibody for use in further experiments in these animal species.  相似文献   

Changes during winter in water‐stable aggregation due to crop residue quality     

C. Le Guillou  D. A. Angers  P. Leterme  S. Menasseri‐Aubry 《Soil Use and Management》2012,28(4):590-595

There is a need to develop practices that contribute to increased water‐stable aggregation (WSA) during winter in a humid temperate climate when soil is particularly prone to water erosion. Our objectives were to determine the effects of crop residue quality on WSA during winter and to relate these effects to biochemical indicators of fungal and bacterial biomass. Three graminae crop residues were selected for their different C/N ratios and biochemical characteristics (green oat residues, C/N = 18.8; wheat straw, C/N = 125.6; and mature miscanthus residues, C/N = 311.3). In October 2009, crop residues were added with an equivalent amount of C in the 0–10 cm layer to a Luvisol in north‐west France. WSA, expressed as mean weight diameter (MWD), amino sugar, soil mineral N and water contents were measured at regular intervals during 5 months. Aggregate MWD of the control soil decreased rapidly and remained low until the last sampling date in March which illustrates the structural vulnerability of bare soils in winter in this pedo‐climatic area. The incorporation of all three crop residues had significant positive impacts on aggregate MWD. Despite widely different C/N ratios, the maximum MWD under each treatment was similar (three times greater than the control soil). Maximum MWD occurred at times that clearly depended on residue quality. Maximum values occurred early for green oat (29 day), but were delayed to 50 day for wheat straw and to 154 day for miscanthus. Results from correlation analysis suggest that variations in WSA were partly mediated by microbial agents with a dominant effect of bacteria for green oat and a combined role of fungal and bacterial biomass for wheat straw. We suggest that the maximum MWD associated with the miscanthus late in the experiment is related to changes in the composition of the fungal community. Overall, our study shows that autumn application of crop residues increases WSA during winter with its effect being microbially mediated and determined by residue quality.  相似文献   

Pseudohyperparathyroidism in a mare associated with squamous cell carcinoma of the vulva     

L F Karcher  J L Le Net  B F Turner  T J Reimers  B C Tennant 《The Cornell veterinarian》1990,80(2):153-162

An 18-year-old Appaloosa mare was examined because of squamous cell carcinoma of the vulva, anorexia with pronounced weight loss, and hypercalcemia. The tumor had developed rapidly over a period of 3 months and externally extended ventrally involving the perineum and the dorsal aspect of the udder. Necropsy examination demonstrated a large primary squamous cell carcinoma of the vulva, perineum, and mammary gland with metastases to the supramammary, sublumbar, deep inguinal, and mediastinal lymph nodes. No gross renal lesions were observed and, histologically, there was only mild vacuolation of renal tubular epithelium. Based on the normal concentration of serum parathyroid hormone, the absence of evidence of hypervitaminosis D, and normal renal function, a diagnosis was made of hypercalcemia of malignancy or pseudohyperparathyroidism. The mechanism responsible for hypercalcemia was not determined, but the histologic type of the neoplasm and the clinical course suggested possible production of a humoral hypercalcemic factor by the neoplasm, similar to that demonstrated in certain types of human squamous cell carcinoma.  相似文献