physiology of sperm maturation and fertilization

... consisted in removal and deposition of the organic layer and some underlying mineral soil in berms beside the trench In each of the nine blocks of RP and 10 blocks of LC, we randomly assigned the ... contained 37% sand, 47% silt, and 26% clay Both soil profiles were characterized by a mor humus layer of cm Experimental sites RP and LC were clearcut-harvested in the summers of 1996 and 1997, respectively, ... competing vegetation combination of six and seven randomly chosen blocks of RP and LC, respectively Bags were buried flat at 10-cm depth in scarified plots (top edge of trenches) or 10 cm below the...

Ngày tải lên: 08/08/2014, 01:21

... to that of sperm length to minimise the risk of breakage All details of this method are given in Joly (1987 and 1989) The sperm length of the 48 other species belonging to different taxa of the ... classes of the head and flagellum of Drosophila spermatozoa Cytogenetics 10, 177-189 Beatty R.A & Napier R.A.N (1960) Genetics of gametes II - Strain differences in characteristics of rabbit spermatozoa ... Normal spermatogenesis in Drosophila In: Biology of Drosophila (Demerec M ed.) 1-61, New York, Wiley Dybas L.K & Dybas H.S (1981) Coadaptation and taxonomic differentiation of sperm and spermathecae...

Ngày tải lên: 14/08/2014, 20:20

... of intact sperm recovered in Study Sperm counts tallied both intact sperm and sperm heads not attached to a tail The number of intact sperm was expressed as a percentage of the total number of ... cross-sections of untreated testis The tall seminiferous epithelium contains many spermatocytes (sp), round spermatids (rs) and condensing spermatids (cs) Tails (t) of condensing spermatids and newly ... a Sperm Count Index equal to 3.9 and approximately one third of this group’s sperm counts fell into the range of 41 - 80 million sperm per cauda epididymis Group 10 had a Sperm Count Index of...

Ngày tải lên: 05/03/2014, 17:20

... isomerization of the double bond between carbons 15 and 16 and rotation of the C14–C15 single bond (see Figure 17.4) (Andel et al 1997) During the conversion of Pr to Pfr, the protein moiety of the ... the bud and first node of pea (Figure 17.6), or the tip and node regions of the coleoptile in oat However, differences in expression patterns between monocots and dicots and between Type I and Type ... However, a light requirement is Phytochrome and Light Control of Plant Development often observed in the small seeds of herbaceous and grassland species, many of which remain dormant, even while hydrated,...

Ngày tải lên: 07/03/2014, 21:20

... (reflectivity) of the ground and amount and type of aerosols have a significant influence, and in addition the total amount of atmospheric ozone is of specific importance for the level of UVB radiation ... understand the entire organism, and not merely an isolated function This book is devoted to the presentation of a collection of articles on adaptation and survival strategies at the level of cell physiology ... understanding plant growth forms and the physiology of temperature adaptation The following Chap by C L€tz and H.K Seidlitz describes effects of anthropou genic increases in UV radiation and tropospheric...

Ngày tải lên: 14/03/2014, 09:20

... DNA; single-stranded or doublestranded; strategy of replication (2) Size and morphology, including type of symmetry, number of capsomeres, and presence of membranes (3) Presence of specific enzymes, ... loss of contact inhibition and the piling up of cells into discrete foci Such alterations are a heritable property of the transformed cells Morphologic and Structural Effects Formation of syncytia, ... RNA and DNA polymerases, and neuraminidase (4) Susceptibility to physical and chemical agents, especially ether (5) Immunologic properties (6) Natural methods of transmission (7) Host, tissue, and...

Ngày tải lên: 15/03/2014, 12:59

... things (herpes and HIV in humans, for example) Viruses are found everywhere Viruses consist of a core of nucleic acid, either DNA or RNA, and a protective coat of protein molecules and sometimes ... Viruses The Boundary of Life At the boundary of life, between the macromolecules (which are not alive) and the prokaryotic cells (which are), lie the viruses and bacteriophages (phages) ... sometimes lipids In isolation, viruses and bacteriophages show none of the expected signs of life They not respond to stimuli, they not grow, they not any of the things we normally associate with...

Ngày tải lên: 15/03/2014, 13:08

... "Physiology of Man "; Rosenthal's "Physiology of the Muscles and Nerves"; Bernstein's "Five Senses of Man"; Huxley and Youmans's "Physiology and Hygiene"; Sappey's "Traité d'Anatomie "; Luys's "Brain and ... first bone of the thumb, standing apart from the rest, enjoys a special freedom of motion, and adds greatly to the usefulness of the hand FIG 12 [Illustration: _Bones of the Hand and the Wrist._] ... "Foods"; Bain's "Mind and Body"; Pettigrew's "Animal Locomotion"; Carpenter's "Human Physiology, " and "Mental Physiology" ; Wilder and Gage's "Anatomy"; Jarvis's "Physiology and Laws of Health." Hargreaves's...

Ngày tải lên: 15/03/2014, 13:20

... Hormones: Physiology, Biochemistry and Molecular Biology, 2nd ed Kluwer, Dordrecht, Netherlands Davies, W J., and Zhang, J (1991) Root signals and the regulation of growth and development of plants ... different effects on the growth of roots and shoots, and the effects are strongly dependent on the water status of the plant Figure 23.6 compares the growth of shoots and roots of maize seedlings grown ... synthesis of storage proteins, and the acquisition of dormancy Seed dormancy and germination are controlled by the ratio of ABA to GA, and ABA-deficient embryos may exhibit precocious germination and...

Ngày tải lên: 16/03/2014, 22:20

... high pressure NMR, and stopped flow and single–molecule analyses, have been established, and are applicable to the elucidation of the dynamic features of cytochromes c It is of interest to characterize ... that some of them are the residues responsible for stability, and in fact Ala7, Met13, and Tyr43 in HT c-552 have been shown, by mutagenesis and 3D structure analyses, to be determinants of the ... quintuple mutant, and the corresponding ones of the wild-type PA c-551 and HT c-552 are colored purple, green, and red, respectively (A) The region around A7/M13 in HT c-552 and the corresponding...

Ngày tải lên: 24/03/2014, 03:21

Ngày tải lên: 08/04/2014, 12:37

Ngày tải lên: 08/04/2014, 12:40

... 24 rof derutam setycoo TNCS fo ecnetepmoc latnempoleved desaerced taht detseggus ]31[ reklöH ]61[ h 44 rof derutam esoht naht TNCS retfa noitamrof tsycotsalb dna egavaelc rehgih dewohs h 33 rof ... tnempoleved oyrbme rof muidem )CVI( erutluc ehT stnemirepxe lla ni desu saw hctab emas eht morf diulf ralucillof enicroP esu litnu Co02− ta derots dna ,deretlif ,nim 51 rof × 009,1 ta degufirtnec ... ralucillof morf detceles erew sPSF raelc dna tnerapsnarT MVI no metsys erutluc-oc eht fo tceffe eht enimreted ot sPSF htiw derutam erew setycoo ,1 tnemirepxE nI demrofrep erew snoitacilper ruof fo...

Ngày tải lên: 07/08/2014, 20:23

... μg/mL of heparin, 10 mg/mL of bovine serum albumin (BSA) to evaluate sperm quality and to use as 100 μL-droplets of spermatozoa for IVF Evaluation of sperm For evaluation of progressive motile sperm, ... human sperm: a review of the frequency and distribution of aneuploidy, effects of donor age and lifestyle factors Cytogenet Cell Genet 2000, 90, 219-226 Siegel MS, Haynie LB Effect of human sperm ... fertilizing ability of sperm Because both the physical and functional integrity of the sperm plasma-membrane are essential for cell survival [3] and are closely related to fertility, sperm membrane...

Ngày tải lên: 07/08/2014, 23:22

... (Tab I) Most of the final number of needle primordia were accrued in terminal buds of OD, NDW and SD seedlings within weeks of the start of hardening, while with fertilization additional primordia ... always significant The –10 °C index of injury fell to 10% or less for the first time after weeks of hardening for SD and OD trees and after 10 and 12 weeks for NDWF and NDW seedlings, respectively ... the mean of replicates of three shoot tips No data is available for week due to contamination of the samples with polyethylene glycol Figure Transpiration (and standard error bars) of excised...

Ngày tải lên: 08/08/2014, 01:21

... sampled except Ca and Mg Fertilization resulted in an increase of N, S, and B and a decrease in concentration of P, Douglas-fir seedling treatments and growth K, Cu, Fe, Zn, and Mn Fertilization ... were dried, ground, and sent to a lab for analysis of the concentrations of all major and micro nutrients with standard laboratory procedures 2.6.3 Vegetation The percent cover of vegetation in ... eight randomly selected seedlings in each plot after the first and second year of growth The samples were collected in fall from lateral branches in the upper third of the crown and consisted of...

Ngày tải lên: 08/08/2014, 01:21

... May in the form of 112 kg.ha of ’superphosphate triple’, containing -1 50 kg of P 690 kg.ha of ’scories Thomas’, -1 ; O containing 110 kg of P and 345 kg of CaO; O and 400 kg.ha of ’patenkali’, ... interactive (Kollist and Valk, 1982) positive effect of drainage and fertilization Most other studies dealt with drainage or fertilization separately The effect of drainage on the growth of coniferous ... time of the natural regeneration of the trees, which is always sparse and uncertain The very forest status of the land is even often at stake: the understorey is invaded by a dense cover of few...

Ngày tải lên: 08/08/2014, 18:21

... examined the profiles of pro- and anti-inflammatory cytokines produced by P3-infected DCs in vitro and in vivo Our results showed that P3 infection enhanced the releases of IL-10 and CCL2 of DCs but ... penicillin, 10 ng/ml of rmGMCSF and rmIL-4) At day and of culturing, 50% of the supernatant was removed and replenished with fresh DCs media At day 6, non-adherent cells were collected and transferred ... investigated the alteration of phenotype and function of the JEV P3-infected DCs both in vitro and in vivo Our results indicated that JEV P3 severely infected DCs in vitro and in vivo, and the infection...

Ngày tải lên: 11/08/2014, 21:21

... LJ, Gil MC: Standardization of sample preparation, staining and sampling methods for automated sperm head morphometry analysis of boar sperm Int J Androl 2006, 29:553-563 Dahlbom M, Andersson M, ... numbers of this horse, and a detailed study of its semen characteristics was therefore considered necessary The study aims to 1) investigate the sperm morphology and normal sperm head morphometry of ... equine sperm microscopy was 60× 200 morphologically normal sperm heads were acquired in each test, and consequently a total of 800 sperm were analyzed for each animal The software reported five sperm...

Ngày tải lên: 12/08/2014, 18:22

... between 329 and 355 nt due to the position of the mutations (B) Representative RPA where µg of cytoplasmic RNA and an equivalent of 2.5 × 106 cpm of virion RNA was probed with × 105 cpm of KS2ΨKE ... 10 µl of neat RNA (-) Bottom panel: The percentage of GFP positive cells was measured by FACS at 72 h postinfection Arbitrary levels of RNA of and are equivalent to 62.5 cpm and 250 cpm of WT ... distinctive neat band but rather as a variably spread band In addition, it is not always possible to clearly distinguish the end of the dimer band from the beginning of the monomer band and the background...

Ngày tải lên: 13/08/2014, 05:22