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The occurrence and development of 'Siamese twins' and other abnormalities in Oreochromis mossambicus (Pisces, Cichlidae)
K.K. Holden,M.N. Bruton
African Zoology , 2012,
Abstract: ENGLISH ABSTRACT: Specimens from a clutch of Oreochromis mossambicus (Pisces, Cichlidae) exhibited a number of abnormalities such as enlarged pericardia, thin tube-like hearts, large depressions in the yolksac, spinal deformities and twinning. Descriptions of the differences in early ontogeny of two pairs of 'Siamese twins' over a period of at least eight days are given. The developmental pattern of the twins is similar to that of normal specimens but the developmental rate is slower in the twins. Possible explanations for these occurrences of polyembryony are given. *********** AFRIKAANSE OPSOMMING: Daar is gevind dat 'n broeisel van Oreochromis mossambicus embrio's abnormaliteite getoon het, soos byvoorbeeld vergrote hartsakke, dun pypvormige harte, groot holtes in die dooiersak, misvormings van die ruggraat en tweelingvorming. Beskrywings van die verskille in die vroe ontwikkeling van twee pare Siamese tweelinge gedurende 'n periode van nie minder nie as agt dae word verskaf. Die ontwikkelingspatroon van die tweelinge is gelyk aan die van 'n normale embrio maar die ontwikkelingstempo is stadiger in die tweelinge. Moontlike verklarings vir hierdie voorkoms van poli-embrionie word voorgestel.
A life-history approach to the early ontogeny of the Mozambique tilapia Oreochromis mossambicus (Pisces, Cichlidae)
K.K. Holden,M.N. Bruton
African Zoology , 2012,
Abstract: ENGLISH ABSTRACT: The early ontogeny of Oreochromis mossambicus (Peters) was followed from the time of egg activation until the juvenile period. Development is direct and consists of an embryonic period of approximately 15 days. The embryonic period can be divided into a cleavage, an embryonic and a free-embryonic phase. A detailed developmental description is given and the relationship between the early ontogeny and the early life-history pattern is examined. The terminology used for the last step of the free-embryonic phase and a possible truncated larval period is discussed. *********** AFRIKAANSE OPSOMMING: Die vroe ontwikkeling van Oreochromis mossambicus (Peters) word gevolg van die oomblik van eieraktivering tot die jongvisstadium. Die ontwikkeling is direk en bestaan uit 'n embrionale periode van ongeveer 15 dae. Die embrionale periode kan verdeel word in die selklowingsfase, die embrionale fase en die vry-embriofase. 'n Gedetailleerde beskrywing van die ontwikkeling word gegee en die verwantskap tussen die vroee ontwikkeling en die patroon van die vroee leefwyse word ondersoek. Die terminologie wat vir die finale stap van die vry-embriofase en 'n moontlik verkorte larwale tydvak gebruik word, word bespreek ..
Effect of Some Water Pollutants on the Biology of the Nile Bolti, Oreochromis niloticus
K.K. Barakat
Pakistan Journal of Biological Sciences , 2004,
Abstract: Samples of water and Oreochromis niloticus fish were collected from El-Mahmoudya channel near Alexandria for contaminants determination. The data show that El Mahmoudya channel water includes relatively high levels of Fe, Cu and chlordane and much higher levels of Zn and lindane. Most of the dissolved, metals and organic contaminants or their metabolites were monitored in the fish and then eggs. The above pollutants were found to affect spawning behaviour and duration. The average number of eggs per spawn were higher in the control groups than the contaminated ones. The residue levels monitored in the eggs affected the fry survival of the Nile fish.
Differential inoculation techniques of Colletotrichum acutatum on different part of pepper
K.K. PANDEY*
Indian Phytopathology , 2011,
Abstract: An experiment was conducted to test the differential infectivity of Colletotrichum acutatum by inoculating different plant parts of pepper (Capsicum annum) on six different varieties. The conidial concentration 1x106 per ml from five days old culture was used for artificial inoculation. Inoculation of leaves showed infection as hypersensitive reaction in most of the varieties. The lesion size on twigs varied from 2.0 to 9.6 mm at cent percent infection site. Severity was much more pronounced on vertical inoculated twigs with complete rotting in comparison to horizontal inoculation. On fruits, lesions were more prominent and clear on pinpricked fruits than apical cut fruits. Petal infection started showing symptoms as yellowish brown followed by orange brown with dry rotting. PBC-932-6-6-1 was having maximum resistance against disease in comparison to other varieties. The findings indicate that C. acutatum can infect all above plant parts on challenge inoculation. However, the degree of infectivity depends on differential resistance response of varieties and methods of inoculation. Inoculation on vertical cut end of stem was best technique for creating die-back infection while surface inoculation was best initiating anthracnose infection which can be successfully utilized for quick screening and to study relation between dieback and anthracnose.
Evaluation of different agricultural based substrate for mass multiplication of Trichoderma viride
K.K. PANDEY*
Indian Phytopathology , 2011,
Abstract:
"Catheter Ablation of Arrhythmias" by Zipes, Douglas P., MD; 2nd Edition, 2002; Futura Publications.
Sethi K.K
Indian Pacing and Electrophysiology Journal , 2002,
Abstract: Since the publication of the first edition of this book eight years ago, considerable new information has been acquired about mechanisms of arrhythmias, pathways and sites for ablation, and techniques of ablation. Publication of the second edition is, therefore, timely and contemporary. With chapters contributed by well recognized international experts in arrhythmia management, the book is a practical and useful reference for physicians engaged in catheter ablation. It brings together presentations made at Bordeaux Symposium held in May 2001. Of particular interest to the basic scientist are mechanisms of reentrant arrhythmia , especially ventricular tachycardia , studied in experimental ,perfused preparations. Chapters on minimal electrophysiological assessment and mapping techniques before ablation are brief but informative. Curative treatment of atrial fibrillation, a challenge for the last decade, has been described succinctly, focussing both on pulmonary venous as well as linear ablation techniques. Adequate emphasis has also been laid on typical and atypical atrial flutter and focal atrial tachycardias , written individually in separate chapters. The classic arrhythmias for which catheter ablation was initiated, viz, atrioventricular nodal reentry, accessory pathways and Mahaim fibres are also well represented. The approach to ventricular tachycardia related to structural heart disease, with its attendant complexities, and advances in newer mapping techniques, is comprehensively described. Finally, as the emotional impact of our ability to abolish conduction over accessory pathways still holds, ventricular fibrillation is the new, emerging challenge. The book has clear and concise figures, including coloured examples of relevant imaging techniques. The style is very readable; the information can be absorbed easily. It is certainly an important addition to the current knowledge about the source and treatment of cardiac arrhythmias.
Migraine Pathophysiology - Evolution Of Our Knowledge
Sinha K.K
Annals of Indian Academy of Neurology , 2002,
Abstract: The biologic basis of migraine had remained unclear until about 15 years, but current migraine research has made some major advances to explain its mechanism. Migraine is currently conceived to originate in the brain. The trigger of an attack starts a depolarising event very similar to "spreading depression" of Leao in a brain that is already hyperexcitable. Hyperexcitability of cell membrane is perhaps genetically determined. Cortical depolarising events drive the trigeminovascular system through mechanisms that are largely hypothetical but might include a migraine generating centre in the brainstem to produce changes in the vessels of the cranium and meninges. Pain sensations carrying impulses are relayed back, first reaching the trigeminal ganglion caudalis and the trigeminal cervical complex in upper cervical cord from where they are relayed further up through various transmitting pathways to the brainstem, thalamus and the cortex where pain is finally perceived and registered.
Book Review: Handbook of Partial Least Squares: Concepts, Methods and Applications
Wong, K.K.
International Journal of Business Science and Applied Management , 2011,
Abstract:
Mechanical Behaviour of Duplex Phase Structures in a Medium Carbon Low Alloy Steel  [PDF]
K.K. Alaneme, S. Ranganathan, T. Mojisola
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.97044
Abstract: The mechanical behaviour of duplex phases produced in a medium carbon low alloy steel with potentials for use as machine body parts and vehicle panels, has been investigated. A representative composition of the steel (C: 0.3; Si: 0.28; Mn: 0.97; Cr: 0.15) was utilized to produce ferrite – martensite duplex phases of varied proportions by intercritical annealing treatment. The tensile, hardness, and rotating bending fatigue behaviour of the structures were studied; and optical and SEM microscopy utilized to characterize the microstructures and their fracture characteristics. The duplex phase structures exhibited continuous yielding behaviour; and were characterised by high strain hardenability, high tensile strength, total elongation, toughness and superior fatigue strength (endurance limit) in comparison with the normalised structure. The fatigue fracture was observed to be characterized by mixed mode of ductile (dimple) fracture and intergranular brittle cleavage for the duplex structures. Superior tensile and fatigue property combinations were better harnessed when treatment was performed at 760℃ and 780℃ in comparison to 740℃.
Design of a Diesel Fired Heat-Treatment Furnace  [PDF]
K.K. Alaneme, S.O. Olanrewaju
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.97041
Abstract: This research is centered on the design of a diesel fired heat-treatment furnace using locally sourced materials. The design philosophy is to eliminate the use of heating elements requiring electric power which is poorly supplied in the country. Design drawings were produced and mild steel was used for the fabrication of the furnace casing, while the other components needed for the design were selected based on functionality, durability, cost and local availability. The furnace was assembled by lining the inner wall of the casing with refractory blocks made from heated mixture of kaolin, clay, sawdust and water after which the inner pot and electro technical devices (temperature controller, light indicator etc) were positioned. Testing was subsequently performed to evaluate the performance of the furnace. It was observed that the furnace has a fast heating rate (61.24℃/min to attain a pre-set temperature of 900℃); and a fuel consumption rate less than 1.41litres/hr. It was also observed that the furnace has good heat retaining capacity; can be easily maintained and safe for use.
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