bluuebunny/crossref_metadata_2025_split huggingface dataset:
Frequency and distribution of herbicide resistance in Raphanus raphanistrum populations randomly collected across the Western Australian wheatbelt
Authors: WALSH M J , OWEN M J , POWLES S B 
Published: November 2007

SummaryIn 2003, a random survey was conducted across the Western Australian wheatbelt to establish the extent and frequency of herbicide resistance in Raphanus raphanistrum populations infesting crop fields. Five hundred cropping fields were visited, with 90 R. raphanistrum populations collected, representative of populations present in crop fields throughout the Western Australian wheatbelt. Collected populations were screened with four herbicides of various modes of action that are commonly used for the control of this weed. The majority of Western Australian R. raphanistrum populations were found to contain plants resistant to the acetolactate synthase (ALS)‐inhibiting herbicide chlorsulfuron (54%) and auxin analogue herbicide, 2,4‐D amine (60%). This survey also determined that over half (58%) of these populations were multiple resistant across at least two of the four herbicide modes of action used in the screening. Only 17% of R. raphanistrum populations have retained their initial status of susceptibility to all four herbicides. The distribution patterns of the herbicide‐resistant populations identified that there were higher frequencies of resistant and developing resistance populations occurring in the intensively cropped northern regions of the wheatbelt. These results clearly indicate that the reliance on herbicidal weed control in cropping systems based on reduced tillage and stubble retention will lead to higher frequencies of herbicide‐resistant weed populations. Therefore, within intensive crop production systems, there is a need to diversify weed management strategies and not rely entirely on too few herbicide control options.
Modelling the correlation between plant phenology and weed emergence for improving weed control
Authors: OTTO S , MASIN R , CHISTÈ G , ZANIN G 
Published: November 2007

SummaryThe efficiency of weed control practices could be improved if their timing is linked to weed emergence dynamics. A study was conducted in a pre‐alpine valley in northern Italy to evaluate whether the phenological phases of some perennial plants could serve as reliable indicators of time of weed emergence and thus be an alternative to bioclimatic models for supporting management decisions. Weed emergence was observed from 2003 to 2004 in five sites at different altitudes. The emergence dynamics of the main weeds were modelled with a Gompertz model. The phenology of 10 common shrubs and a tree was monitored by visual assessment. The flowering and fruit‐ripening phases of the most useful shrubs were modelled with a lognormal model. Correlation analysis between the two functions was used to study the correspondence between plant phenology and weed emergence. Flowering and fruit‐ripening phases of the shrubs were well described by the lognormal model. The correlation analysis between the lognormal model and Gompertz model showed correspondences between the phenological phases and emergence dynamics of the main weeds. The proposed method can be used to examine shrub phenology–weed emergence correlations and consequently for supporting weed management, under certain conditions.
A European biotype of Amaranthus retroflexus cross‐resistant to ALS inhibitors and response to alternative herbicides
Authors: SCARABEL L , VAROTTO S , SATTIN M 
Published: November 2007

SummaryAn acetolactate synthase (ALS)‐resistant Amaranthus retroflexus biotype was collected in a soyabean crop after repeated exposure to imazethapyr and thifensulfuron‐methyl in north‐eastern Italy. Studies were conducted to characterise the resistance status and determine alternative post‐emergence herbicides for controlling this biotype. Whole‐plant bioassay revealed that the GR50 values were 1898‐ and 293‐fold higher than those observed for the biotype susceptible to imazethapyr and imazamox respectively. The biotype also displayed high cross‐resistance to sulfonylureas. Molecular analysis demonstrated that a single nucleotide substitution had occurred in domain B (TGG to TTG at position 574), conferring a change from the amino acid tryptophan to leucine in the resistant biotype. However, herbicides with other modes of action (PSII, 4‐HPPD and PPO inhibitors) provided excellent control. The GR50 ratios for metribuzin, terbuthylazine and mesotrione were close to 1 and treatments with fomesafen gave 100% control of both susceptible and resistant biotypes at the recommended field dose. This study documents the first case of an imidazolinone and ALS‐resistant biotype in European crops and identifies the post‐emergence herbicide options available for managing this troublesome weed in soyabean crops. Alternative management strategies are also discussed.
Structure of Thymic Cysts in Congenital Lymph Nodes‐lacking Mice
Authors: Nakamura Y. , Qu N. , Terayama H. , Naito M. , Yi S.‐Q. , Moriyama H. , Itoh M. 
Published: November 2007

SummaryThe ALY (aly/aly) mouse, a mutant of the C57BL/6j strain, has a severe immunodeficiency because of immature development of the immune organs. Both lymph nodes and Peyer’s patches are lacking and both the thymus and spleen are small. Previous microscopical observation of their thymus glands revealed the presence of an indistinct border between the cortex and medulla, the absence of Hassal’s corpuscles and the reduction of the medullary epithelial cell population. However, other microscopical findings for these glands have not yet been reported. In the present study, we performed light and electron microscopical observation of the thymus and found the consistent presence of extremely irregular shaped cystic cavities lined by microvilli‐bearing epithelium in the medulla. The cysts comprised ceca and did not open into adjacent capillaries, although they contained some lymphocytes and macrophages in their lumens. In the thymus glands of normal C57BL/6j mice, only some small cysts oval in shape could be inconspicuously found in the medulla. Therefore, the thymic cysts may normally regress during thymic development, however, in ALY mice, the cysts may remain because of the organ immaturity.
Study of the Morphology of the Olfactory Organ of African Ostrich Chick
Authors: Jin E. H. , Peng K. M. , Wang J. AX. , Du A. N. , Tang L. , Wei L. , Wang Y. , Li S. H. , Song H. 
Published: November 2007

SummaryThe anatomy and histology of the olfactory organ of African ostrich chick were carefully observed by gross anatomy observation, paraffin sectioning and haematoxylin–eosin (HE) staining. The results showed that there were no keratotic nose lids at the entrance of the external naris, and that the nasal cavity was separated into two imperforate compartments by the nasal septum. The posterior conchae were connected with the middle conchae without cohering to nasal walls, and appeared to be part of a palinal elongation of the middle conchae. Olfactory cells were distributed in the mucosal epithelium of middle and posterior conchae. Nasal glands were shaped like irregular rectangles, and their connective tissue extended to the parenchyma, which was divided into many glandular lobules. The layers of the olfactory bulb were indistinct, the globular structure was inconspicuous and the granular cells were scattered relatively in the lamina granularis externa.
New frontiers in understanding drip loss in pork: recent insights on the role of postmortem muscle biochemistry
Authors: Huff‐Lonergan E. , Lonergan S. M. 
Published: November 2007

SummaryThe aim of this review was to summarize some of the most important and novel hypotheses regarding the development of water‐holding capacity in pork. Among the key factors that determine water‐holding capacity are rate and extent of pH decline and the structure of the muscle and the muscle cell itself. However, there have been numerous reviews on the importance of pH yet relatively few on the concept of how muscle cell structure influences the ability of the postmortem cell to maintain water/moisture. Recent advances in the ability of scientists to monitor the movement of water within the cell and within the muscle and to monitor protein degradation have led to new hypotheses regarding the development of drip or purge from fresh meat. One of the more novel and promising hypotheses that has surfaced recently is that alterations in the architecture of the cell may govern the retention/loss of moisture from the muscle cell and ultimately the muscle. The degradation of cytoskeletal and intermediate filament proteins (like desmin) early postmortem may release constraints within the cell that limit the space available for water/fluid that has been forced from the myofibril during rigour. Conversely, degradation of some membrane proteins (like integrin) could actually contribute to the formation of drip channels and thus might actually improve the ability of moisture to ‘escape’ from the muscle cell. Thus, water‐holding capacity in fresh meat is associated with specific changes that occur in early postmortem muscle.
Structural and functional genomics to elucidate the genetic background of microstructural and biophysical muscle properties in the pig
Authors: Wimmers K. , Murani E. , Ngu N. T. , Schellander K. , Ponsuksili S. 
Published: November 2007

SummaryLinkage analyses enable identifying genomic regions that exhibit quantitative trait loci (QTL) without prior hypothesis on the physiology of a trait. Function‐oriented expression analyses are a complementary approach to derive hypothesis on the genetic background of phenotypic variation. Muscle fibre types and size affect body composition and meat quality traits. The number and proportion of muscle fibres are to a large extent determined during the prenatal development. Consequently, QTL for muscle fibre, meat quality and carcass traits were detected in a porcine experimental population based on Duroc and Berlin Miniature Pig. Regions with either significant QTL for muscle fibre traits or significant QTL for meat quality and muscularity or both were detected on SSC1, 2, 3, 4, 5, 13, 14, 15 and 16. Here, effects on the complex traits of muscularity and meat quality might be the result of genetic variation primarily affecting fibre type distribution traits. To complement the QTL study expression profiling of prenatal muscle tissue of Duroc and Pietrain was conducted that revealed a list of functional candidate genes for meat quality and carcass traits of various physiological networks. Assignments of these genes to QTL regions highlight them as positional functional candidates. Exemplarily, five genes were analysed further and shown to be associated with meat quality and carcass traits. Further, the relative MYH isotype transcript abundance was found to be associated with muscularity. Relative MYH isotype transcript abundance is proposed as a new phenotype to unravel the genetic background of variation in traits related to muscle and meat properties.
NMR and the water‐holding issue of pork
Authors: Bertram H. C. , Andersen H. J. 
Published: November 2007

SummaryConsumers’ awareness of food quality has never been more pronounced. Meat forms a substantial part of the food consumption, and accordingly techniques to control the quality of meat are needed. In addition, a better understanding of how basic biochemical and biophysical factors influence the final meat quality is also required for optimization of the quality. Water‐holding capacity (WHC) is a major quality attribute of fresh meat. However, the exact mechanisms determining the WHC of meat are not fully understood. Especially, characteristics about proposed water populations in the meat and how they are interrelated with drip loss need to be studied further. Moreover, the distribution and mobility of water in muscle during its conversion to meat and how they are affected by intrinsic and extrinsic factors are poorly elucidated. Nuclear magnetic resonance (NMR) has during recent years gained increasing use within different areas of muscle physiology and meat science. NMR1H relaxation methodologies enable detection of the mobility of protons in heterogeneous materials and thereby provide possibilities for a characterization of the properties of water. The objective of this presentation is to give an overview of the use of NMR relaxation measurements to characterize the proposed water populations in meat and investigate how the distribution and mobility of the water changes postmortem. In addition, applications of NMR spectroscopy in metabolic studies will be considered.
Interaction of Intact Porcine Spermatozoa with Epithelial Cells and Neutrophilic Granulocytes during Uterine Passage
Authors: Taylor U , Rath D , Zerbe H , Schuberth H‐J 
Published: November 2007

ContentNew insemination techniques allow a tremendous sperm reduction for successful artificial insemination (AI) if highly diluted semen is deposited in the tip of the uterine horn and close to the utero‐tubal junction. High sperm losses are known to occur during uterine passage and it was the general question whether specific binding mechanisms are involved. Upon arrival in the uterus, spermatozoa are confronted with mainly two different cell types: uterine epithelial cells (UEC) and neutrophilic granulocytes (polymorphonuclear neutrophil, PMN). As cell–sperm interactions can hardly be observed in vivo, an ex vivo system was established to study the interaction between spermatozoa and the UEC. Uterine segments (10 cm) from freshly slaughtered synchronized juvenile gilts were inseminated for 60 min at 38°C. Thereafter spermatozoa were recovered, counted flow cytometrically and examined for changes in viability and mitochondrial membrane potential (MMP). Significantly less spermatozoa with a functioning MMP and intact plasma membranes could be retrieved (55 ± 7%), while the number of damaged spermatozoa hardly changed (93 ± 12%), indicating retention of viable sperm cells in the uterine lumen. The interactions between porcine PMN and spermatozoa (motile, immotile, membrane‐damaged) were studied in coincubation assays in vitro. The binding of membrane‐damaged sperm cells to PMN was virtually non‐existent (3 ± 2%). Viable and motile spermatozoa attached to PMN without being phagocytosed within 60 min (45 ± 3%), whereas binding to sodium fluoride (NaF)‐immobilized spermatozoa was reduced to 20 ± 2%. The binding of viable sperm to PMN is most likely not lectin‐dependent; although both viable cell types were shown to express a broad range of different lectin‐binding sugar residues, none of the lectins tested was able to selectively block PMN‐sperm binding significantly. The results of the study suggest that viable spermatozoa are already subject to selective processes within the uterus before further selection is initiated at the utero‐tubal junction and in the oviductal isthmus.
Interrelationship Between Plasma Membrane Integrity, Mitochondrial Membrane Potential and DNA Fragmentation in Cryopreserved Bovine Spermatozoa
Authors: Bollwein H , Fuchs I , Koess C 
Published: November 2007

ContentsThe objective of this flow cytometric study was to examine plasma membrane integrity, mitochondrial membrane potential (MMP) and the degree of DNA fragmentation of cryopreserved bovine sperm immediately (0 h) and 3 h after thawing and to compare the results with each other and with the fertility of bulls. Cryopreserved spermatozoa from 4 consecutive ejaculates of 20 bulls were examined. Percentages of plasma membrane intact sperm (PMI) and sperm showing a high MMP (HMMP), respectively, were determined by the SYBR14/PI‐ and the JC‐1 assays. DNA fragmentation was analysed by the standard deviation of the DNA fragmentation index (SD‐DFI) and the percentage of sperm with a high degree of DNA fragmentation (%DFI) by using SCSATM. The mean non‐return rate on day 56 (NRR 56) ranged from 63.7% to 78.0% (mean ± SD: 71.8% ± 3.7%). Mean values for PMI and HMMP decreased from 37.4% ± 6.8% to 31.2% ± 6.1% and from 38.8% ± 7.1% to 23.8% ± 7.7% respectively. SD‐DFI increased from 56.9% ± 8.0% to 69.0% ± 12.9% and %DFI from 6.4% ± 2.5% to 12.4% ± 5.8%. The correlation between PMI 0 h and HMMP 0 h (r = 0.95; p < 0.0001) was higher (p < 0.05) than that between PMI 3 h and HMMP 3 h (r = 0.88; p < 0.0001). %DFI 0 h was neither related to PMI 0 h nor to HMMP 0 h (p > 0.05), nor was there a correlation (p > 0.05) between DFI 3 h and PMI 3 h; but %DFI 3 h and HMMP 3 h were significantly correlated (r = −0.31; p < 0.05). SD‐DFI and %DFI 3 h were the only parameters related to NRR 56 (r = −0.58; p < 0.05). In conclusion, plasma membranes and mitochondria are similarly affected by the freezing and thawing process, but not during the incubation period after thawing.
Climatic determinants of the northern range limit of Fagus crenata forests in Japan
Authors: YAGIHASHI TSUTOMU , MATSUI TETSUYA , NAKAYA TOMOKI , TANAKA NOBUYUKI , TAODA HIROSI 
Published: November 2007

AbstractWe sought to identify the factors that determine the current northern range limit of Fagus crenata (Fagaceae) forests in Japan. Four climatic factors (warmth index, minimum temperature of the coldest month, summer precipitation and winter precipitation) can potentially explain the distribution. Five classification tree models were developed: one based on all four factors, the others based on the four permutations of three of the four climatic factors (i.e. each excluded one of the four factors). The performance and the distributions of F. crenata forests predicted by these models were then compared, with particular reference to the distributions in Hokkaido. The distribution predicted by the model developed without summer precipitation extended continuously northwards along the Sea of Japan coast beyond the current northern range limits, but the distributions predicted by the other three models showed gaps around the current limit. When the warmth index, minimum temperature of the coldest month or winter precipitation were excluded the contribution to the resulting models of the other three variables increased, thereby compensating for the exclusion. However, the exclusion of summer precipitation was not compensated by increases in the contributions of the other variables in the model developed without this factor. These results suggest that summer precipitation is the most influential factor explaining the absence of F. crenata forests in the areas immediately to the north‐east of the current northern range limit.
Preretinal Macular Fibrosis: A Review Stressing Its Association with Massive Preretinal Retraction
Authors: McGuinness R. , Mitchell P. , Banks C. N. 
Published: November 2007

SummaryPreretinal macular fibrosis is a common condition in its early form manifesting as a glistening reflex on the surface of the retina leading to retinal folds and tortuosity of the retinal blood vessels. A more extensive late form exists which may lead to spontaneous massive preretinal retraction.
INVESTIGATION OF RETINITIS PIGMENTOSA
Authors: BIRD A. C. 
Published: November 2007

AbstractRetinitis pigmentosa is a solitary manifestation o1 separate genetically determined disorders in which there is progressive loss of vision and the appearance of characteristic fundus abnormalities. It is likely that each disease contained within this family of disorders has a different aetiology, a consideration which is important to the clinician, the researcher and the therapist. To the clinician it is essential to be able to identify the inheritance of the disorder in order to give educated genetic advice. It is the responsibility of the clinician to sub‐divide retinitis pigmentosa into purer samples of disease since without such a sub‐division research is unlikely to be fruitful. It is unreasonable to expect a biochemist to define systemic biochemical abnormalities if blood is analysed from a series of patients, each of which has a different disorder. If the cause of retinal degeneration in an animal homologue of human retinitis pigmentosa is identified the question is then raised as to whether the abnormality is relevant to human disease and, if so, to which one. Moreover, if a metabolic abnormality is identified in one disease it will not necessarily be found in others and similarly, if therapy is effective in one form of the disease it may not be effective for all patients.A sub‐division of retinitis pigmentosa may be made on the basis of inheritance of the disorder, on the basis of morphologic changes in the fundus, and on the qualitative functional changes identified. Such observations may also give some clues as to the pathogenesis of the different forms of RP or at least indicate in which cell system the primary disorders lie and will also show in what way the defect interferes with cell function.In this paper it is hoped to show that studies undertaken by the various disciplines within ophthalmology have now made limited achievements towards the goals of subdividing retinitis pigmentosa (RP) into purer samples of disease and typifying the functional and morphological attributes of the constituent disorders.
OCULAR LEUKAEMIA IN ACUTE LYMPHOBLASTIC LEUKAEMIA OF CHILDHOOD
Authors: BREMNER M. H. , WRIGHT J. 
Published: November 2007

AbstractModern cytotoxic drugs increase the survival rate of children with Acute Lymphoblastic Leukaemia (ALL): But the eye is a pharmacological sanctuary and after clinical “cure” of the haematological disease the child may be blinded by leukaemic ocular infiltration.Should this prophylactic irradiation of the posterior segment of the eye and optic nerve be repeated on diagnosis of CNS leukaemia and at specified intervals thereafter with recurrence of CNS leukaemia?This is the history of a child who had had no recurrence of haematological leukaemia for four and a half years but following remission developed central nervous system (CNS) leukaemia followed by leukaemic iridocyclitis in the right eye after 20 months and in the left eye after three years three months from the initial diagnosis of ALLProphylactic cranial irradiation is performed on initial haematological diagnosis of ALL This includes prophylactic irradiation of the posterior segment of the eye and optic nerve.
IMMUNOLOGY OF OCULAR TOXOPLASMOSIS
Authors: Wakefield Denis , Penny Ronald 
Published: November 2007

AbstractToxoplasma gondii, due to its ability to escape and modify the normal immune response, is able to survive within the retina indefinitely with the production of an occasional acute inflammatory response. The cellular immune system is mainly responsible for limiting infection. Diagnosis is based on clinical features coupled with measurements of antibody response (systemic and ocular) and cell mediated immunity. The treatment of toxoplasma chorioretinitis when indicated should be specific and immunosuppressive agents should only be used in conjunction with antibiotics to avoid dissemination of the organism.
HERPETIC EYE DISEASE
Authors: FRACO DOUGLAS J. COSTER , MD RICHARD D. GRUTZMACHER 
Published: November 2007

AbstractHerpetic keratitis is a common condition which can produce severe complications. The pattern of disease created by the virus depends on an interaction of virus and host mediated mechanisms. The changes in the epithelium are a consequence of the cytopathic effect of the virus and are related directly to virus replication. Changes produced in the stroma are due to inflammatory mechanisms initiated by the presence of virus antigens. The treatment of epithelial disease is aimed at reducing virus replication. The treatment of stromal disease is directed towards suppressing inflammation without increasing virus replication. Various anti‐viral agents are available and each has a different mechanism of action and properties which make each anti‐viral agent more suitable in particular situations. Many clinical trials have been conducted which indicate the place of anti‐viral agents. The management of stromal disease is more complicated and less information is available from clinical trials to indicate the best possible method of treatment.