检索结果-南通市图书馆

Implications of turbulent shear on clay floc break-up along the Atlantic estuary(Bouregreg),Morocco

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2022年第2期37卷 248-257页

作者： Krishnamoorthy Lakshmi Ammal Priya Soufiane Haddout joan Cecilia Catubig Casila Department of Civil Engineering TKM College of Engineering Department of Physics Faculty of Science Ibn Tofail University Land and Water Resources Division IABE CEAT University of the Philippines Los Ba?os

Water depth,salinity,current,and suspended sediment concentration(SSC) were measured along with the grain size distribution of bed sediment along an estuarine longitudinal *** floc size increased with increase in the percentage of clay and silt,while decreased with increase in the percentage of sand content of bed *** turbulent shear,G,had a direct effect on floc size with its value increasing with increase in G up to a G value of 15 s,while an inverse relation existed between floc size and G at higher G(C> 15 s).Further,higher turbulence enabled sand to get resuspended and cause additional shear leading to the break-up of *** attempt was made to modify G to account for the combined effect of water turbulence(C) and shear imparted by sand(C) and the impact of the modification of G on the predictability of floc size was evaluated.A new model was developed which explains floc size in terms of sediment concentration(C),salinity gradient(S),and G for different scenarios based on the value of *** analysis was done for observed floc size(FS) and predicted floc size using four approaches:(Ⅰ) FS β C~χ;(Ⅱ) FS α C~χS;(Ⅲ) FS α C~χSG~z for G 15 s; and(Ⅳ) FS α C~χSGfor G> 15 sand G=G+G,where x,y,and z are determined by *** was observed that the predictability of the floc size improved when the turbulence was modified to account for shear imparted by sand so that the coefficient of determination was increased from 0.78 for model Ⅲ to 0.89 for model Ⅳ.Further,the settling velocity was expressed as a function of suspended sediment concentration,turbulent shear,and salinity *** predictability of settling velocity was improved(R~2 increased from 0.77 to 0.86) when the additional turbulence created by sand was incorporated in the non-dimensional empirical *** study highlights the influence of sand in causing the break-up of flocs and suggests that for turbulence shear values high enough to resuspend

关键词： Floc size Settling velocity Turbulent shear Non-cohesive sediment Bouregreg estuary Morocco

The effect of landscape complexity and microclimate on the thermal tolerance of a pest insect

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2018年第5期25卷 905-915页

作者： Lucy Alford Kevin Tougeron Jean-Sebastien Pierre Francoise Burel joan van Baaren UMR 6553 ECOBIO Centre National de la Recherche Scientitique Universite de Rennes I Rennes Cedex France Departement de Sciences Biologiques Insfitut de Recherche en Biologie Vegetale Universite de Montreal Montreal QC Canada Universite Europeenne de Bretagne (UEB) Rennes France

Landscape changes are known to exacerbate the impacts of climate change. As such, understanding the combined effect of climate and landscape on agroecosystems is vital if we are to maintain the fimction of agroecosystems. This study aimed to elucidate the effects of agricultural landscape complexity on the microclimate and thermal tolerance of an aphid pest to better understand how landscape and climate may interact to affect the thermal tolerance of pest species within the context of global climate change. Meteo- rological data were measured at the landscape level, and cereal aphids （Sitobion avenae, Metopolophium dirhodum and Rhopalosiphum padi） sampled, from contrasting landscapes （simple and complex） in winter 2013/2014 and spring 2014 in cereal fields of Brittany, France. Aphids were returned to the laboratory and the effect of landscape of origin on aphid cold tolerance （as determined by CTmin） was investigated. Results revealed that local landscape complexity significantly affected microclimate, with simple homogenous landscapes being on average warmer, but with greater temperature variation. Landscape complexity was shown to impact aphid cold tolerance, with aphids from complex land- scapes being more cold tolerant than those from simple landscapes in both winter and spring, but with differences among species. This study highlights that future changes to land use could have implications for the thermal tolerance and adaptability of insects. Fur- thermore, not all insect species respond in a similar way to microhabitat and microclimate, which could disrupt important predator-prey relationships and the ecosystem service they provide.

关键词： agroecosystems biological control cereal aphids climate change coldtolerance landscape ecology

Outflow reconstruction with arterial patch in domino liver transplantation: a new technical option

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2014年第5期13卷 551-554页

作者： Laura Lladó Emilio Ramos Sofia De LaSerna joan Fabregat Liver Transplant Unit Hospital Universitari de Bellvitge

Domino liver transplantation（LT）, using livers from familial amyloidotic polyneuropathy（FAP） patients, is a well described technique useful to expand donor pool. One of the main difficulties of this type of LT arises from the necessity to share the vascular pedicles between the graft and the donor. The most important challenge resides in restoring a proper hepatic venous outflow in the FAP-liver *** is specially challenging when using the piggy-back technique, because the hepatic stumps may be too short. To overcome this issue, surgeons explored several techniques using different types of venous grafts. We describe a new technical option by using an arterial graft from the deceased donor. By using both iliac arteries a long graft is created and sutured as needed to the hepatic vein stump. We describe herein this new technique employed in a domino liver recipient who underwent retransplantation for ischemic cholangitis. The procedure was performed using the piggy-back technique; the venous stump of the FAP liver was reconstructed with the arterial graft. The patient had uneventful postoperative and mid-term hepatic function, and anastomosis was patent 24 months after LT.

关键词： liver transplantation technique graft hepatic vein iliac artery

The known, the secret, the forgotten

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The known, the secret, the forgotten

Unpaired sex chromosomes in metaphase I human spermatocytes locally modify autosomal bivalents positioning

作者： joan Wheelis.

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2018年第6期20卷 626-628页

作者： Carla Mayans joan Blanco Oliver Valero Francesca Vidal Zaida Sarrate Genetics of Male Fertility Group Unitat de Biologia Cel.lularDepartament de Biologia Cel.lularFisiologia i ImmunologiaFacultat de BiocienciesUniversitat Autbnoma de BarcelonaBellaterra（Cerdanyola del Vall~s）08193Spain Servei d＇Estadistica Aplicada Universitat AutOnoma de BarcelonaBetlaterra（Cerdanyola del Valles）08193Spain.

Dear Editor, In interphase nuclei, chromosomes occupy specific localizations called chromosome territories （CTs）. Distribution of CTs has been related to chromosome size and gene density and is known to influence gene expression.~ This pattern of organization appears to be a widespread nuclear feature, both in somatic and germ ceils.

关键词：

Effect of transjugular intrahepatic portosystemic shunt on pulmonary gas exchange in patients with portal hypertension and hepatopulmonary syndrome

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第43期11卷 6858-6862页

作者： Graciela Martínez-Pallí Britt B Drake joan-Carles García-Pagán joan-Albert Barberà Miguel R Arguedas Robert Rodriguez-Roisin Jaume Bosch Michael B Fallon Servei d'Anestesiologia i Reanimació. Hospital Clínic University of Alabama at Birmingham Liver Center Hepatic Hemodynamic Laboratory Servei de Pneumologia i Al.lèrgia Respiratòria

AIM: To assess the impact of transjugular intrahepatic portosystemic shunt (TIPS) on pulmonary gas exchange and to evaluate the use of TIPS for the treatment of hepatopulmonary syndrome (HPS).METHODS: Seven patients, three of them with advanced HPS, in whom detailed pulmonary function tests were performed before and after TIPS placementat the University of Alabama Hospital and at the Hospital Clinic, Barcelona, were ***: TIPS patency was confirmed by hemodynamic evaluation. No changes in arterial blood gases were observed in the overall subset of patients. Transient arterial oxygenation improvement was observed in only one HPS patient, early after TIPS, but this was not sustained 4 mo ***: TIPS neither improved nor worsened pulmonary gas exchange in patients with portal hypertension. This data does not support the use of TIPS as a specific treatment for HPS. However, it does reinforce the view that TIPS can be safely performed for the treatment of other complications of portal hypertension in patients with HPS.

关键词： Portal hypertension Transjugular intrahepaticportosystemic shunt Pulmonary gas exchange Hepatopulmonary syndrome

Potential Economic Value of Chitin and Its Derivatives as Major Biomaterials of Seafood Waste,with Particular Reference to Southeast Asia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2022年第4期10卷 909-938页

作者： Hsiao Wei Tan Zhi Yin joan Lim Nur Airina Muhamad Fong Fong Liew Institute of Research Management and Services Research and Innovation Management ComplexUniversity of MalayaKuala Lumpur50603Malaysia Department of Restorative Dentistry Faculty of DentistryMAHSA UniversitySaujana Putra CampusJenjarum42610Malaysia Institute of Biological Sciences Faculty of ScienceUniversity of MalayaKuala Lumpur50603Malaysia Department of Oral Biology&Biomedical Sciences Faculty of DentistryMAHSA UniversitySaujana Putra CampusJenjarum42610Malaysia

With a growing population,changes in consumerism behavior and trends in consumption in Indo-Pacific Asia,our seafood processing and consumption practices produce a large volume of waste *** are several advantages in regulating and sustaining shellfish processing *** major advantage of waste management is that it leads to better conservation of natural resources in the long *** shell waste contains useful biomaterials,which are still untapped due to inadequate waste disposal and solid waste ***,the major component of shell waste,can be extracted either chemically or *** chemical extraction approaches,which use acids and alkali,could be an environmental *** the other hand,biological methods can be eco-friendly alternatives for shell waste *** this review,recent trends in management of shellfish waste as sources of chitin,conversion of chitin into chitosan,economic aspects of waste treatment and application of chitosan will be discussed.

关键词： Seafood waste waste management chitin chitosan economic value Southeast Asian fisheries

脊髓切片中运动神经元的膜片箝技术研究:一种分析药物作用的高效工具(英文)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2000年第6期21卷 29-37页

作者： joan J KENDIG CA 94305 Department of Anesthesia Stanford University School of Medicine USA

AIM: To develop a tool for detailed analysis of spirally acting anesthetic and analgesic agents. METHODS: Studies were done on visually identified motor neurons in 400 uuuuuuuum thick spinal cord slices from 14-23 d old rats using patch clamp techniques. Ethanol was used as a prototype general anesthetic agent. RESULTS: Cell bodies in the ventrolateral horn identified as motor neurons by retrograde fluorescent labeling had a mean dimension of 32 ± 5 /Mm (x ± s, n = 25). Mean resting potential was - 62. 8 ± 2. 4 mV; input resistance was 44±24 MΩ (n = 19). Threshold was -44± 7 mV, and action potential amplitude 101 ± 9 mV from baseline. Ethanol concentrations at and below 50-200 mmol/L decreased motor neuron excitability to the injected current; there was no effect on resting potential, but a variable reversible increase in input resistance. Ethanol re-versibly depressed the excitatory postsynaptic potential, with a dose-response relationship similar to that previously observed for the population e

关键词：脊髓运动神经元乙醇醇类全身麻醉突触后机制

Landscape effects on the thermotolerance of carabid beetles and the role of behavioral thermoregulation

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2023年第1期30卷 251-263页

作者： Luck Alford Sacha Roudine Jean-Sébastien Pierre Francoise Burel joan van Baaren UMR 6553 ECOBIO Universitede Rennes 1Rennes CedexFrance School of Biological Sciences Universityof BristolBristolUK

Physiological thermotolerance and behavioral thermoregulation are central to seasonal cold adaptation in ectothermic *** species with enhanced mobility,behavioral responses may be of greater importance in the cold stress *** the carabid beetles as a study organism,the current study compared physiological thermotolerance and behavioral thermoregulation in carabid species inhabiting cereal fields in different landscape contexts,from fine grain heterogeneous“complex”landscapes to homogenous“simple”*** thermotolerance was determined via measurement of the CTmin and chill coma *** responses to cold temperature exposure were determined employing a purpose built arena,and thoracic temperature measured to estimate the efficacy of the behavior as a form of behavioral *** revealed an influence of landscape composition on the cold tolerance of carabid beetles,although species differed in their sensitivity to landscape intensification.A reduced effect of landscape on the thermotolerance of larger carabid beetles was observed,thought to be the consequence of greater mobility preventing local acclimation to microclimatic variation along the landscape intensification *** into behavioral thermoregulation of the 3 largest species revealed burrowing behavior to be the main behavioral response to cold stress,acting to significantly raise carabid body *** finding highlights the importance of behavioral thermoregulation as a strategy to evade cold *** use of behavioral thermoregulation may negate the need to invest in physiological thermotolerance,further offering explanation for the lack of landscape effect on the physiological thermotolerance of larger carabids.

关键词： agroecosystems local adaptation physiological thermal tolerance plasticity winter resistance