Generalized biomass equations for the main aboveground biomass components of maritime pine across contrasting environments     

Olfa Shaiek  Denis Loustau  Pierre Trichet  Céline Meredieu  Beya Bachtobji  Salah Garchi  Mohamed Hédi EL Aouni 《Annals of Forest Science》2011,68(3):443-452

• Introduction   

In order to predict the biomass of aerial components of maritime pine stands (Pinus pinaster Ait.), generalized allometric equations were developed using data collected from the southern and northern margins of its geographical area.  相似文献   

Isolation and identification of locally isolated bacterial strains effective against whitefly Bemisia tabaci     

Salah El-Din El-Assal  Narmen A. Youssef 《Archives of Agronomy and Soil Science》2013,59(6):779-790

Potent bacterial strains effective against the whitefly, Bemisia tabaci, nymphs (second instar), were isolated from tomato cultivated fields at Fayoum governorate, Giza, Egypt. Of 72 isolates, 12 with the most morphologically distinct-looking bacterial colonies were selected and named A1, A2, A3, A6, A7, A9, A12, A13, A107, B37, B45 and B100. All isolates were preliminarily identified as members of the genus Bacillus based on morphological, physiological and biochemical characteristics. When tested for their pathogenicity against Bemisia tabaci, the 12 isolates revealed varying efficiencies with isolates A1 and A9 being superior, exhibiting maximum mortality of 92.2 and 90.8% on day 10, respectively. Isolate A7 recorded the lowest percentage at 18.3%. Further genetic characterization of the 12 isolates was performed using inter simple sequence repeat (ISSR), randomly amplified polymorphic DNA (RAPD) and 16S rDNA gene sequencing analysis. RAPD and ISSR results confirmed each other. The combined ISSR and RAPD phylogenetic tree showed two major clusters. With 16S rRNA gene analysis, isolate A1 and A12 sequences recorded 100% identity with Bacillus thuringiensis, while isolates A7 and B100 showed 95.7% and 95.6% identity with Bacillus cereus and Bacillus sphaericus, respectively.  相似文献   

Effects of Zn2+ on Ca2+ uptake by mitochondria and endoplasmic reticulum in permeabilized tilapia gill cells     

P. M. Verbost  M. A. Salah El-Deen  P. Pelt  M. M. J. C. Bijvelds  S. E. Wendelaar Bonga 《Fish physiology and biochemistry》1996,15(4):299-305

An intracellular ATP-dependent Ca²⁺ pumping mechanism, distinct from mitochondrial Ca²⁺ accumulation, was identified within tilapia gill cells. Cell suspensions treated with 0.003% saponin, which selectively permeabilizes the plasma membrane, were used to characterize the Ca²⁺ sequentering mechanisms as endoplasmic reticulum and mitochondria and to determine the effect of Zn²⁺ on their Ca²⁺ storing activity. Of the Ca²⁺ taken up by the endoplasmic reticulum, 80% was released by IP₃ (10 mol l^–1). The Ca²⁺ pump of the endoplasmic reticulum was 2.5 times less sensitive to Zn²⁺ (IC₅₀=0.05 nmol l^–1) than was the mitochondrial uptake mechanism (IC₅₀=0.20 nmol l^–1). The results indicate that Ca²⁺ is stored predominantly within the endoplasmic reticulum at 0.1 mol l^–1 and that this storing capacity is seriously attenuated by namomolar concentrations Zn²⁺.  相似文献   

Exploring the impacts of different fasting and refeeding regimes on Nile tilapia (Oreochromis niloticus L.): growth performance,histopathological study,and expression levels of some muscle growth-related genes     

Elbialy  Zizy I.  Gamal  Shrouk  Al-Hawary  Ibrahim I.  Shukry  Mustafa  Salah  Abdallah S.  Aboshosha  Ali A.  Assar  Doaa H. 《Fish physiology and biochemistry》2022,48(4):973-989

Fish Physiology and Biochemistry - The current study investigated how different fasting and refeeding regimes would impact Nile tilapia growth performance, histopathological examination, and gene...  相似文献   

Prospective Clinical Trial to Compare Vincristine and Vinblastine in a COP‐Based Protocol for Lymphoma in Cats     

E.L. Krick  R.B. Cohen  T.P. Gregor  P.C. Salah  K.U. Sorenmo 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2013,27(1):134-140

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Effect of broomrape (Orobanche cumana Wallr.) on some agro-morphological and biochemical traits of Tunisian and some reference sunflower (Helianthus annuus L.) accessions     

Hosni  Taoufik  Abbes  Zouhaier  Abaza  Leila  Medimagh  Sana  Ben Salah  Hamadi  Kharrat  Mohamed 《植物病害和植物保护杂志》2020,127(6):831-841

Journal of Plant Diseases and Protection - Orobanche cumana Wallr. is an important new problem for sunflower crop in Tunisia. Little information is available on the behavior of sunflower to O....  相似文献   

Effect of Garlic,Echinacea, Organic Green and Vet-Yeast on Survival,Weight Gain,and Bacterial Challenge of Overwintered Nile Tilapia Fry (Orechromis niloticus)     

Salah Mesalhy Aly  Gamal Osman El Naggar  Mohamed Fathi Mohamed  Waheed Elwan Mohamed 《Journal Of Applied Aquaculture》2013,25(3):210-215

The purpose of this study was to examine the effect of some immunostimulants and probiotics on the survival rate, final weight, and disease resistance of overwintered tilapia fry. There were five treatments: T1 (control) fed a balanced diet (35% protein) without additives. Treatments 2 to 5 were fed diets supplemented with 4% garlic, 4 g/kg Echinacea, 4 g/kg Organic Green or 4 g/kg Vet-Yeast, respectively. Growth and resistance to disease challenge with Aeromonas hydrophila and Pseudomonas flourescens were not different among treatments, but survival of overwintered fry increased in treatments fed probiotics or immunostimulents. The use of garlic in overwintering feeds could allow hatchery operators to increase their prices for fry and fish farmers to stock production ponds earlier, increasing hatchery revenues by 74% and improving land use efficiency and productivity for the Egyptian aquaculture industry.  相似文献   

Sarcophine-Diol Inhibits Expression of COX-2, Inhibits Activity of cPLA2, Enhances Degradation of PLA2 and PLC��1 and Inhibits Cell Membrane Permeability in Mouse Melanoma B16F10 Cells     

Pawel T. Szymanski  Pratik Muley  Safwat A. Ahmed  Sherief Khalifa  Hesham Fahmy 《Marine drugs》2012,10(10):2166-2180

Sarcophine-diol (SD) is a semi-synthetic derivative of sarcophine with a significant chemopreventive effect against non-melanoma skin cancer both in vitro and in vivo. Recently, we have studied the effect of SD on melanoma development using the mouse melanoma B₁₆F₁₀ cell line. In this study, our findings show that SD suppresses cell multiplication and diminishes membrane permeability for ethidium bromide (EB), a model marker used to measure cell permeability for Ca²⁺ ions. SD also decreases protein levels of COX-2, and increases degradation of phospholipases PLA₂ and PLC_γ1 and diminishes enzymatic activity of the Ca²⁺-dependent cPLA₂. This lower membrane permeability for Ca²⁺-ions, associated with SD, is most likely due to the diminished content of lysophosphosphatidylcholine (lysoPC) within cell membranes caused by the effect of SD on PLA₂. The decrease in diacylglycerol (DAG) and inositol 1,4,5-triphosphate (IP₃) due to inhibition of PLC_γ1, leads to the downregulation of Ca²⁺-dependent processes within the cell and also inhibits the formation of tumors. These findings support our previous data suggesting that SD may have significant potential in the treatment of melanoma.  相似文献   

Growth performance,oxidative stress indices and hepatic carbohydrate metabolic enzymes activities of juvenile Nile tilapia,Oreochromis niloticus L., in response to dietary starch to protein ratios          下载免费PDF全文

Mohamed Salah Azaza  Noura Khiari  Mohamed Naceur Dhraief  Néji Aloui  Mohamed Mejdeddine Kraϊem  Abdelfattah Elfeki 《Aquaculture Research》2015,46(1):14-27

The effect of various dietary starch to proteins ratios (STA/P) on growth performance, oxidative status and liver enzyme activities involved in intermediary metabolism in juvenile Nile tilapia was evaluated. Four isocaloric‐practical diets (12.73 MJ kg^?1 digestible energy) with increasing STA/CP ratios were formulated. These were designated D₀ (344 g crude protein (CP) and 163.5 g starch (STA) kg^?1), D₁ (310 g CP and 243 g STA kg^?1), D₂ (258 g CP and 322 g STA kg^?1) and D₃ (214 g CP and 401 g STA kg^?1). Each diet was fed to triplicate groups of 60 fish (2.7 g) for 45 days. Compared with the control diet (D₀), significantly (P < 0.05) depressed growth and feed efficiency were observed only in the groups fed on diet D₃. The activities of hepatic enzymes involved in glycolysis and lipogenesis pathways were significantly enhanced in groups fed on diet D₃ compared with other diets. A significant (P < 0.05) increase in catalase activity was detected only in groups fed on diet D₃. Similarly, a significant (P < 0.05) enhancement in superoxyde dismutase, glutathione S‐transferases and glutathione peroxidise was observed in groups fed on diets D₂ and D₃ compared with other diets. Results demonstrate the ability of juvenile Nile tilapia to spare protein by dietary carbohydrate.  相似文献   

Risk factors for stunting among under-fives in Libya     

El Taguri A  Betilmal I  Mahmud SM  Monem Ahmed A  Goulet O  Galan P  Hercberg S 《Public health nutrition》2009,12(8):1141-1149

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