The study investigated genotypic and phenotypic co-efficients of variation, heritability, genetic advance at 5% selection intensity and in percentage of population mean of nine characters (plant height, leaf number, l...The study investigated genotypic and phenotypic co-efficients of variation, heritability, genetic advance at 5% selection intensity and in percentage of population mean of nine characters (plant height, leaf number, length and width of leaf lamina, number and weight of cormels per plant, weight of corm per plant, dry matter percentage in the tubers and tuber yield per from 14 cultivars of taro [Colocasia esculenta (L.) Schott]). Results indicated highest genotypic co-efficient of variation for dry matter percentage (47.91), which was 95.78% of the phenotypic co-efficient of variation, whereas tuber yield per plant showed the widest range (819.37). Number of cormels per plant and dry matter percentage ehibited considerably higher heritability (84.90% and 91.70%, respectively) and genetic advance (81.19 and 79.00, respectively), indicating the potentiality of selection for improvement of such characters. These two characters were found to be positively correlated to tuber yield per plant. Path analysis revealed that weight of cormels per plant possessed the highest direct effect on tuber yield, indicating the importance of selection based on this character to increase tuber yield per plant.展开更多
OBJECTIVE: To recognize the significances of the classification, evaluation, treatment, pathogenesis, etiological factors and related foci of hemispatial neglect (HSN) in the treatment and prognosis of stroke patients...OBJECTIVE: To recognize the significances of the classification, evaluation, treatment, pathogenesis, etiological factors and related foci of hemispatial neglect (HSN) in the treatment and prognosis of stroke patients. DATA SOURCES: Articles related to HSN in stroke published in English from January 1985 to December 2002 were searched in Medline database by using the of "stroke, hemispatial neglect (HSN), rehabilitation". Chinese relevant professional works and articles were also referred to. STUDY SELECTION: The data were primarily checked. Inclusive criteria: ① articles about the HSN symptoms in stroke; ② articles about the classification, evaluation, treatment, pathogenesis, etiological factors and related foci of HSN, as well as the treatment and prognosis of stroke. The repetitive studies or reviews were excluded. DATA EXTRACTION: Totally 474 articles related to HSN in stroke were collected, 43 of them were involved, and 431 repetitive studies or reviews were excluded. DATA SYNTHESIS: HSN can be classified as sensory neglect and motor neglect. Because HSN is caused by the injury of network structure which mediated directed attention, it is generally believed that the inferior parietal lobule of dominant hemisphere is the most closely correlated with neglect. The main theories related to the pathogenesis of HSN at present include "internal instruction", "directed bradykinesia", "sensory attention", etc. The main clinical manifestations are setover in drawing lines, picture drawing towards one side, imitation towards one side, picture description towards one side, etc., which can be evaluated by the line bisection test, target cancellation test, picture drawing test and pegboard test. The most important thing for the treatment is to make the patients continuously concentrate on the neglected side. CONCLUSION: HSN is an indicator for the bad outcome of cerebrovascular disease, the symptoms take longer time to rehabilitate with slow recovery, but quite a few HSN patients will get good prognosis if timely treatment and proper program are given.展开更多
Cytoplasmic male sterility(CMS) is a maternally inherited trait that results in the failure to produce functional pollen.It was identified in many plants,and it is widely used to exploit heterosis.
文摘The study investigated genotypic and phenotypic co-efficients of variation, heritability, genetic advance at 5% selection intensity and in percentage of population mean of nine characters (plant height, leaf number, length and width of leaf lamina, number and weight of cormels per plant, weight of corm per plant, dry matter percentage in the tubers and tuber yield per from 14 cultivars of taro [Colocasia esculenta (L.) Schott]). Results indicated highest genotypic co-efficient of variation for dry matter percentage (47.91), which was 95.78% of the phenotypic co-efficient of variation, whereas tuber yield per plant showed the widest range (819.37). Number of cormels per plant and dry matter percentage ehibited considerably higher heritability (84.90% and 91.70%, respectively) and genetic advance (81.19 and 79.00, respectively), indicating the potentiality of selection for improvement of such characters. These two characters were found to be positively correlated to tuber yield per plant. Path analysis revealed that weight of cormels per plant possessed the highest direct effect on tuber yield, indicating the importance of selection based on this character to increase tuber yield per plant.
文摘OBJECTIVE: To recognize the significances of the classification, evaluation, treatment, pathogenesis, etiological factors and related foci of hemispatial neglect (HSN) in the treatment and prognosis of stroke patients. DATA SOURCES: Articles related to HSN in stroke published in English from January 1985 to December 2002 were searched in Medline database by using the of "stroke, hemispatial neglect (HSN), rehabilitation". Chinese relevant professional works and articles were also referred to. STUDY SELECTION: The data were primarily checked. Inclusive criteria: ① articles about the HSN symptoms in stroke; ② articles about the classification, evaluation, treatment, pathogenesis, etiological factors and related foci of HSN, as well as the treatment and prognosis of stroke. The repetitive studies or reviews were excluded. DATA EXTRACTION: Totally 474 articles related to HSN in stroke were collected, 43 of them were involved, and 431 repetitive studies or reviews were excluded. DATA SYNTHESIS: HSN can be classified as sensory neglect and motor neglect. Because HSN is caused by the injury of network structure which mediated directed attention, it is generally believed that the inferior parietal lobule of dominant hemisphere is the most closely correlated with neglect. The main theories related to the pathogenesis of HSN at present include "internal instruction", "directed bradykinesia", "sensory attention", etc. The main clinical manifestations are setover in drawing lines, picture drawing towards one side, imitation towards one side, picture description towards one side, etc., which can be evaluated by the line bisection test, target cancellation test, picture drawing test and pegboard test. The most important thing for the treatment is to make the patients continuously concentrate on the neglected side. CONCLUSION: HSN is an indicator for the bad outcome of cerebrovascular disease, the symptoms take longer time to rehabilitate with slow recovery, but quite a few HSN patients will get good prognosis if timely treatment and proper program are given.
文摘Cytoplasmic male sterility(CMS) is a maternally inherited trait that results in the failure to produce functional pollen.It was identified in many plants,and it is widely used to exploit heterosis.
